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description Publicationkeyboard_double_arrow_right Article , Other literature type , Journal 2020Publisher:Institute of Electrical and Electronics Engineers (IEEE) Muhammad Arsalan Ilyas; Ghulam Abbas; Thamer Alquthami; Muhammad Awais; Muhammad Babar Rasheed;En el pasado reciente, para satisfacer la creciente demanda energética de electricidad, la integración de recursos energéticos renovables (RES) en una red eléctrica es un centro de atención. Además, la integración óptima de estas RES hace que esta tarea sea más desafiante debido a su naturaleza intermitente. Por lo tanto, en el presente estudio, el problema del flujo de energía se trata como un problema de flujo de energía óptimo multiobjetivo y multiobjetivo (MOOPF) junto con la integración óptima de las RES. Si bien, los objetivos de MOOPF son triples: costo general de generación, pérdida real de energía del sistema y reducción de emisiones de carbono de fuentes térmicas. En este trabajo, se presenta una técnica computacionalmente eficiente para encontrar los valores más factibles de diferentes variables de control del sistema de energía que tienen RES distribuidas. Por lo tanto, la satisfacción de la restricción se logra mediante el uso de un enfoque de función de penalización (PFA) y para desarrollar aún más el verdadero frente de Pareto (PF), el método de dominancia de Pareto se utiliza para categorizar la solución dominante de Pareto. Además, para tratar la naturaleza intermitente de RES, la función de densidad de probabilidad (PDF) y los modelos de potencia estocástica de RES se utilizan para calcular la potencia disponible de RES. Dado que, los objetivos del problema MOOPF son de naturaleza conflictiva, después de tener el conjunto de soluciones no dominantes, se ha utilizado el enfoque de la función de membresía difusa (FMF) para extraer la mejor solución de compromiso (BCS). Para probar la validez de la técnica desarrollada, el sistema de bus IEEE-30 se ha modificado con la integración de RES y el problema de optimización final se resuelve utilizando el algoritmo de optimización de enjambre de partículas (PSO). Los resultados de la simulación muestran el logro de la técnica propuesta que gestiona el valor del costo del combustible a largo plazo con los valores óptimos de otros objetivos. De plus, l'intégration optimale de ces sources d'énergie rend cette tâche plus difficile en raison de leur nature intermittente. Par conséquent, dans la présente étude, le problème du flux d'énergie est traité comme un problème de flux d'énergie optimal multi-contrainte et multi-objectif (MOOPF) avec une intégration optimale des sources d'énergie. Par conséquent, les objectifs du MOOPF sont triples : coût de production global, perte d'énergie réelle du système et réduction des émissions de carbone de sources thermiques.Dans ce travail, une technique efficace sur le plan informatique est présentée pour trouver les valeurs les plus réalisables de différentes variables de contrôle du système d'alimentation ayant des sources d'énergie renouvelables distribuées. Par conséquent, la satisfaction des contraintes est obtenue en utilisant l'approche de la fonction de pénalité (PFA) et pour développer davantage le vrai front de Pareto (PF), la méthode de dominance de Pareto est utilisée pour catégoriser la solution de dominance de Pareto. De plus, pour traiter la nature intermittente des sources d'énergie renouvelables, la fonction de densité de probabilité (PDF) et les modèles de puissance stochastique des sources d'énergie renouvelables sont utilisés pour calculer la puissance disponible à partir des sources d'énergie renouvelables. Depuis, les objectifs du problème MOOPF sont de nature conflictuelle, après avoir utilisé l'approche de la fonction d'appartenance floue (FMF) de l'ensemble de solutions non dominantes pour extraire la meilleure solution de compromis (BCS). Pour tester la validité de la technique développée, le système de bus IEEE-30 a été modifié avec intégration de res et le problème d'optimisation finale est résolu en utilisant l'algorithme d'optimisation d'essaim de particules (PSO). Les résultats de la simulation montrent la réalisation de la technique proposée en gérant la valeur du coût du carburant longtemps avec les valeurs optimales d'autres objectifs. In recent past, to meet the growing energy demand of electricity, integration of renewable energy resources (RESs) in an electrical network is a center of attention.Furthermore, optimal integration of these RESs make this task more challenging because of their intermittent nature.Therefore, in the present study power flow problem is treated as a multi-constraint, multi-objective optimal power flow (MOOPF) problem along with optimal integration of RESs.Whereas, the objectives of MOOPF are threefold: overall generation cost, real power loss of system and carbon emission reduction of thermal sources.In this work, a computationally efficient technique is presented to find the most feasible values of different control variables of the power system having distributed RESs.Whereas, the constraint satisfaction is achieved by using penalty function approach (PFA) and to further develop true Pareto front (PF), Pareto dominance method is used to categorize Pareto dominate solution.Moreover, to deal with intermittent nature of RES, probability density function (PDF) and stochastic power models of RES are used to calculate available power from RESs.Since, objectives of the MOOPF problem are conflicting in nature, after having the set of non-dominating solutions fuzzy membership function (FMF) approach has been used to extract the best compromise solution (BCS).To test the validity of developed technique, the IEEE-30 bus system has been modified with integration of RESs and final optimization problem is solved by using particle swarm optimization (PSO) algorithm.Simulation results show the achievement of proposed technique managing fuel cost value long with the optimal values of other objectives. في الماضي القريب، لتلبية الطلب المتزايد على الطاقة الكهربائية، يعد دمج موارد الطاقة المتجددة (RESs) في شبكة كهربائية مركزًا للاهتمام. علاوة على ذلك، فإن التكامل الأمثل لهذه الموارد يجعل هذه المهمة أكثر صعوبة بسبب طبيعتها المتقطعة. لذلك، في هذه الدراسة، يتم التعامل مع مشكلة تدفق الطاقة على أنها مشكلة تدفق طاقة مثلى متعددة القيود ومتعددة الأهداف (MOOPF) جنبًا إلى جنب مع التكامل الأمثل لـ RESs. في حين أن أهداف MOOPF ثلاثية الجوانب: تكلفة التوليد الإجمالية، وفقدان الطاقة الحقيقي للنظام وتقليل انبعاثات الكربون من المصادر الحرارية. في هذا العمل، يتم تقديم تقنية فعالة حسابيًا للعثور على القيم الأكثر جدوى لمتغيرات التحكم المختلفة لنظام الطاقة الذي قام بتوزيع RES. في حين يتم تحقيق الرضا عن القيد باستخدام نهج دالة العقوبة (PFA) ولمواصلة تطوير جبهة باريتو الحقيقية (PF)، يتم استخدام طريقة هيمنة باريتو لتصنيف حل باريتو المسيطر. علاوة على ذلك، للتعامل مع الطبيعة المتقطعة لـ RES، يتم استخدام دالة الكثافة الاحتمالية (PDF) ونماذج الطاقة العشوائية لـ RES لحساب الطاقة المتاحة من RESs. منذ ذلك الحين، أهداف مشكلة MOOPF هي متضاربة في طبيعتها، بعد استخدام مجموعة من الحلول غير المهيمنة تم استخدام نهج وظيفة العضوية الغامضة (FMF) لاستخراج أفضل حل وسط (BCS). لاختبار صحة التقنية المطورة، تم تعديل نظام ناقل IEEE -30 مع دمج RESs ويتم حل مشكلة التحسين النهائي باستخدام خوارزمية تحسين سرب الجسيمات (PSO). تظهر نتائج المحاكاة تحقيق التقنية المقترحة لإدارة قيمة تكلفة الوقود لفترة طويلة مع القيم المثلى للأهداف الأخرى.
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For further information contact us at helpdesk@openaire.euAccess Routesgold 20 citations 20 popularity Top 10% influence Average impulse Top 10% Powered by BIP!
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You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Other literature type , Journal 2020Publisher:Institute of Electrical and Electronics Engineers (IEEE) Muhammad Arsalan Ilyas; Ghulam Abbas; Thamer Alquthami; Muhammad Awais; Muhammad Babar Rasheed;En el pasado reciente, para satisfacer la creciente demanda energética de electricidad, la integración de recursos energéticos renovables (RES) en una red eléctrica es un centro de atención. Además, la integración óptima de estas RES hace que esta tarea sea más desafiante debido a su naturaleza intermitente. Por lo tanto, en el presente estudio, el problema del flujo de energía se trata como un problema de flujo de energía óptimo multiobjetivo y multiobjetivo (MOOPF) junto con la integración óptima de las RES. Si bien, los objetivos de MOOPF son triples: costo general de generación, pérdida real de energía del sistema y reducción de emisiones de carbono de fuentes térmicas. En este trabajo, se presenta una técnica computacionalmente eficiente para encontrar los valores más factibles de diferentes variables de control del sistema de energía que tienen RES distribuidas. Por lo tanto, la satisfacción de la restricción se logra mediante el uso de un enfoque de función de penalización (PFA) y para desarrollar aún más el verdadero frente de Pareto (PF), el método de dominancia de Pareto se utiliza para categorizar la solución dominante de Pareto. Además, para tratar la naturaleza intermitente de RES, la función de densidad de probabilidad (PDF) y los modelos de potencia estocástica de RES se utilizan para calcular la potencia disponible de RES. Dado que, los objetivos del problema MOOPF son de naturaleza conflictiva, después de tener el conjunto de soluciones no dominantes, se ha utilizado el enfoque de la función de membresía difusa (FMF) para extraer la mejor solución de compromiso (BCS). Para probar la validez de la técnica desarrollada, el sistema de bus IEEE-30 se ha modificado con la integración de RES y el problema de optimización final se resuelve utilizando el algoritmo de optimización de enjambre de partículas (PSO). Los resultados de la simulación muestran el logro de la técnica propuesta que gestiona el valor del costo del combustible a largo plazo con los valores óptimos de otros objetivos. De plus, l'intégration optimale de ces sources d'énergie rend cette tâche plus difficile en raison de leur nature intermittente. Par conséquent, dans la présente étude, le problème du flux d'énergie est traité comme un problème de flux d'énergie optimal multi-contrainte et multi-objectif (MOOPF) avec une intégration optimale des sources d'énergie. Par conséquent, les objectifs du MOOPF sont triples : coût de production global, perte d'énergie réelle du système et réduction des émissions de carbone de sources thermiques.Dans ce travail, une technique efficace sur le plan informatique est présentée pour trouver les valeurs les plus réalisables de différentes variables de contrôle du système d'alimentation ayant des sources d'énergie renouvelables distribuées. Par conséquent, la satisfaction des contraintes est obtenue en utilisant l'approche de la fonction de pénalité (PFA) et pour développer davantage le vrai front de Pareto (PF), la méthode de dominance de Pareto est utilisée pour catégoriser la solution de dominance de Pareto. De plus, pour traiter la nature intermittente des sources d'énergie renouvelables, la fonction de densité de probabilité (PDF) et les modèles de puissance stochastique des sources d'énergie renouvelables sont utilisés pour calculer la puissance disponible à partir des sources d'énergie renouvelables. Depuis, les objectifs du problème MOOPF sont de nature conflictuelle, après avoir utilisé l'approche de la fonction d'appartenance floue (FMF) de l'ensemble de solutions non dominantes pour extraire la meilleure solution de compromis (BCS). Pour tester la validité de la technique développée, le système de bus IEEE-30 a été modifié avec intégration de res et le problème d'optimisation finale est résolu en utilisant l'algorithme d'optimisation d'essaim de particules (PSO). Les résultats de la simulation montrent la réalisation de la technique proposée en gérant la valeur du coût du carburant longtemps avec les valeurs optimales d'autres objectifs. In recent past, to meet the growing energy demand of electricity, integration of renewable energy resources (RESs) in an electrical network is a center of attention.Furthermore, optimal integration of these RESs make this task more challenging because of their intermittent nature.Therefore, in the present study power flow problem is treated as a multi-constraint, multi-objective optimal power flow (MOOPF) problem along with optimal integration of RESs.Whereas, the objectives of MOOPF are threefold: overall generation cost, real power loss of system and carbon emission reduction of thermal sources.In this work, a computationally efficient technique is presented to find the most feasible values of different control variables of the power system having distributed RESs.Whereas, the constraint satisfaction is achieved by using penalty function approach (PFA) and to further develop true Pareto front (PF), Pareto dominance method is used to categorize Pareto dominate solution.Moreover, to deal with intermittent nature of RES, probability density function (PDF) and stochastic power models of RES are used to calculate available power from RESs.Since, objectives of the MOOPF problem are conflicting in nature, after having the set of non-dominating solutions fuzzy membership function (FMF) approach has been used to extract the best compromise solution (BCS).To test the validity of developed technique, the IEEE-30 bus system has been modified with integration of RESs and final optimization problem is solved by using particle swarm optimization (PSO) algorithm.Simulation results show the achievement of proposed technique managing fuel cost value long with the optimal values of other objectives. في الماضي القريب، لتلبية الطلب المتزايد على الطاقة الكهربائية، يعد دمج موارد الطاقة المتجددة (RESs) في شبكة كهربائية مركزًا للاهتمام. علاوة على ذلك، فإن التكامل الأمثل لهذه الموارد يجعل هذه المهمة أكثر صعوبة بسبب طبيعتها المتقطعة. لذلك، في هذه الدراسة، يتم التعامل مع مشكلة تدفق الطاقة على أنها مشكلة تدفق طاقة مثلى متعددة القيود ومتعددة الأهداف (MOOPF) جنبًا إلى جنب مع التكامل الأمثل لـ RESs. في حين أن أهداف MOOPF ثلاثية الجوانب: تكلفة التوليد الإجمالية، وفقدان الطاقة الحقيقي للنظام وتقليل انبعاثات الكربون من المصادر الحرارية. في هذا العمل، يتم تقديم تقنية فعالة حسابيًا للعثور على القيم الأكثر جدوى لمتغيرات التحكم المختلفة لنظام الطاقة الذي قام بتوزيع RES. في حين يتم تحقيق الرضا عن القيد باستخدام نهج دالة العقوبة (PFA) ولمواصلة تطوير جبهة باريتو الحقيقية (PF)، يتم استخدام طريقة هيمنة باريتو لتصنيف حل باريتو المسيطر. علاوة على ذلك، للتعامل مع الطبيعة المتقطعة لـ RES، يتم استخدام دالة الكثافة الاحتمالية (PDF) ونماذج الطاقة العشوائية لـ RES لحساب الطاقة المتاحة من RESs. منذ ذلك الحين، أهداف مشكلة MOOPF هي متضاربة في طبيعتها، بعد استخدام مجموعة من الحلول غير المهيمنة تم استخدام نهج وظيفة العضوية الغامضة (FMF) لاستخراج أفضل حل وسط (BCS). لاختبار صحة التقنية المطورة، تم تعديل نظام ناقل IEEE -30 مع دمج RESs ويتم حل مشكلة التحسين النهائي باستخدام خوارزمية تحسين سرب الجسيمات (PSO). تظهر نتائج المحاكاة تحقيق التقنية المقترحة لإدارة قيمة تكلفة الوقود لفترة طويلة مع القيم المثلى للأهداف الأخرى.
add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.euAccess Routesgold 20 citations 20 popularity Top 10% influence Average impulse Top 10% Powered by BIP!
more_vert add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1109/access.2020.3014046&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Preprint 2024 Australia, Saudi Arabia, Saudi ArabiaPublisher:Institute of Electrical and Electronics Engineers (IEEE) Authors: Muhammad Wasim Nawaz; Abdesselam Bouzerdoum; Muhammad Mahboob Ur Rahman; Ghulam Abbas; +1 AuthorsMuhammad Wasim Nawaz; Abdesselam Bouzerdoum; Muhammad Mahboob Ur Rahman; Ghulam Abbas; Faizan Rashid;handle: 10754/697907
Optical flow is the pattern of apparent motion of objects in a scene. The computation of optical flow is a critical component in numerous computer vision tasks such as object detection, visual object tracking, and activity recognition. Despite a lot of research, efficiently managing abrupt changes in motion remains a challenge in motion estimation. This paper proposes novel variational regularization methods to address this problem since they allow combining different mathematical concepts into a joint energy minimization framework. In this work, we incorporate concepts from signal sparsity into variational regularization for motion estimation. The proposed regularization uses a robust l1 norm, which promotes sparsity and handles motion discontinuities. By using this regularization, we promote the sparsity of the optical flow gradient. This sparsity helps recover a signal even with just a few measurements. We explore recovering optical flow from a limited set of linear measurements using this regularizer. Our findings show that leveraging the sparsity of the derivatives of optical flow reduces computational complexity and memory needs. Comment: 12 pages, 9 figures, and 3 tables
King Abdullah Univer... arrow_drop_down King Abdullah University of Science and Technology: KAUST RepositoryArticle . 2024License: CC BYData sources: Bielefeld Academic Search Engine (BASE)University of Wollongong, Australia: Research OnlineArticle . 2024Data sources: Bielefeld Academic Search Engine (BASE)add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1109/access.2024.3382818&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess RoutesGreen gold 1 citations 1 popularity Average influence Average impulse Average Powered by BIP!
more_vert King Abdullah Univer... arrow_drop_down King Abdullah University of Science and Technology: KAUST RepositoryArticle . 2024License: CC BYData sources: Bielefeld Academic Search Engine (BASE)University of Wollongong, Australia: Research OnlineArticle . 2024Data sources: Bielefeld Academic Search Engine (BASE)add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1109/access.2024.3382818&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Preprint 2024 Australia, Saudi Arabia, Saudi ArabiaPublisher:Institute of Electrical and Electronics Engineers (IEEE) Authors: Muhammad Wasim Nawaz; Abdesselam Bouzerdoum; Muhammad Mahboob Ur Rahman; Ghulam Abbas; +1 AuthorsMuhammad Wasim Nawaz; Abdesselam Bouzerdoum; Muhammad Mahboob Ur Rahman; Ghulam Abbas; Faizan Rashid;handle: 10754/697907
Optical flow is the pattern of apparent motion of objects in a scene. The computation of optical flow is a critical component in numerous computer vision tasks such as object detection, visual object tracking, and activity recognition. Despite a lot of research, efficiently managing abrupt changes in motion remains a challenge in motion estimation. This paper proposes novel variational regularization methods to address this problem since they allow combining different mathematical concepts into a joint energy minimization framework. In this work, we incorporate concepts from signal sparsity into variational regularization for motion estimation. The proposed regularization uses a robust l1 norm, which promotes sparsity and handles motion discontinuities. By using this regularization, we promote the sparsity of the optical flow gradient. This sparsity helps recover a signal even with just a few measurements. We explore recovering optical flow from a limited set of linear measurements using this regularizer. Our findings show that leveraging the sparsity of the derivatives of optical flow reduces computational complexity and memory needs. Comment: 12 pages, 9 figures, and 3 tables
King Abdullah Univer... arrow_drop_down King Abdullah University of Science and Technology: KAUST RepositoryArticle . 2024License: CC BYData sources: Bielefeld Academic Search Engine (BASE)University of Wollongong, Australia: Research OnlineArticle . 2024Data sources: Bielefeld Academic Search Engine (BASE)add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1109/access.2024.3382818&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess RoutesGreen gold 1 citations 1 popularity Average influence Average impulse Average Powered by BIP!
more_vert King Abdullah Univer... arrow_drop_down King Abdullah University of Science and Technology: KAUST RepositoryArticle . 2024License: CC BYData sources: Bielefeld Academic Search Engine (BASE)University of Wollongong, Australia: Research OnlineArticle . 2024Data sources: Bielefeld Academic Search Engine (BASE)add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1109/access.2024.3382818&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Journal 2017Publisher:Institute of Electrical and Electronics Engineers (IEEE) Funded by:NSERCNSERCGhulam Abbas; Jason Gu; Umar Farooq; Ali Raza; Muhammad Usman Asad; M. E. El-Hawary;A number of modern metaheuristic optimization techniques are being exploited to work out a single-objective economic dispatch (ED) problem. The dispatch problems even become more complicated and complex when they consider operational and system constraints, such as network transmission losses, valve-point loading effects originating due to sequential opening of a number of steam admission valves to meet the ever-increasing demand, ramp rate limits, prohibited operating zones, multiple fuel options, spinning reserve, and so on. The heavy constraints make the otherwise convex linear smooth dispatch problem as highly nonconvex nonlinear nonsmooth one. Finding optimal solution for such kind of a constrained nonlinear problem through the deterministic numerical and convex characteristics-based optimization techniques is a difficult task to accomplish. Researchers have frequently employed one of the metaheuristic optimization techniques with powerful computational ability named particle swarm optimization (PSO) to deal with this rather a complicated and toilsome dispatch problem. In Part I of the two-part paper, a comprehensive review or a survey of PSO and its modified versions (involve alterations in the basic structure of PSO) to resolve the constrained ED problem is presented. Part II covers purely the survey of hybrid forms of PSO (hybridization of PSO with other optimization techniques) to tackle the ED problem. The survey is presented in such a way that readers may understand how PSO can be made computationally more efficient.
add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1109/access.2017.2768522&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess Routesgold 110 citations 110 popularity Top 1% influence Top 10% impulse Top 1% Powered by BIP!
more_vert add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1109/access.2017.2768522&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Journal 2017Publisher:Institute of Electrical and Electronics Engineers (IEEE) Funded by:NSERCNSERCGhulam Abbas; Jason Gu; Umar Farooq; Ali Raza; Muhammad Usman Asad; M. E. El-Hawary;A number of modern metaheuristic optimization techniques are being exploited to work out a single-objective economic dispatch (ED) problem. The dispatch problems even become more complicated and complex when they consider operational and system constraints, such as network transmission losses, valve-point loading effects originating due to sequential opening of a number of steam admission valves to meet the ever-increasing demand, ramp rate limits, prohibited operating zones, multiple fuel options, spinning reserve, and so on. The heavy constraints make the otherwise convex linear smooth dispatch problem as highly nonconvex nonlinear nonsmooth one. Finding optimal solution for such kind of a constrained nonlinear problem through the deterministic numerical and convex characteristics-based optimization techniques is a difficult task to accomplish. Researchers have frequently employed one of the metaheuristic optimization techniques with powerful computational ability named particle swarm optimization (PSO) to deal with this rather a complicated and toilsome dispatch problem. In Part I of the two-part paper, a comprehensive review or a survey of PSO and its modified versions (involve alterations in the basic structure of PSO) to resolve the constrained ED problem is presented. Part II covers purely the survey of hybrid forms of PSO (hybridization of PSO with other optimization techniques) to tackle the ED problem. The survey is presented in such a way that readers may understand how PSO can be made computationally more efficient.
add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1109/access.2017.2768522&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess Routesgold 110 citations 110 popularity Top 1% influence Top 10% impulse Top 1% Powered by BIP!
more_vert add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1109/access.2017.2768522&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Journal , Other literature type 2020Publisher:MDPI AG Ghulam Abbas; Muhammad Usman Asad; Jason Gu; Salem Alelyani; Valentina E. Balas; Mohammad Rashid Hussain; Umar Farooq; Ahmed Bilal Awan; Ali Raza; Chunqi Chang;doi: 10.3390/en14010077
Most of the traditional PID tuning methods are heuristic in nature. The heuristic approach-based tuned PID controllers show only nominal performance. In addition, in the case of a digital redesign approach, mapping of the heuristically-designed continuous-time PID controllers into discrete-time PID controllers and in case of the direct digital design approach, mapping of the continuous-time plant (forward converter) into the discrete-time plant, results in frequency distortion (or warping). Besides this, nonlinear elements such as ADC and DAC, and delay in the digital control loop deteriorate the control performance. There is a need to tune conventionally-designed digital controllers to enhance performance. This paper proposes optimized discrete-time PID controllers for a forward DC–DC converter operating in continuous conduction mode (CCM). The considered conventional digital PID controllers designed on the basis of the digital redesign and direct digital approaches are tuned by one of the multivariable unconstrained pattern search methods named Hooke–Jeeves (H–J) search method to ensure excellent output voltage regulation performance against the changes in input voltage and load current. Numerical results show that the H–J-based optimized PID compensated forward converter system shows tremendous improvement in performance compared to its unoptimized counterpart and simulated annealing (SA)-based compensated system, thus justifying the applicability of the H–J method for enhancing the performance.
Energies arrow_drop_down EnergiesOther literature type . 2020License: CC BYFull-Text: http://www.mdpi.com/1996-1073/14/1/77/pdfData sources: Multidisciplinary Digital Publishing Instituteadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.3390/en14010077&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess Routesgold 12 citations 12 popularity Top 10% influence Top 10% impulse Top 10% Powered by BIP!
more_vert Energies arrow_drop_down EnergiesOther literature type . 2020License: CC BYFull-Text: http://www.mdpi.com/1996-1073/14/1/77/pdfData sources: Multidisciplinary Digital Publishing Instituteadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.3390/en14010077&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Journal , Other literature type 2020Publisher:MDPI AG Ghulam Abbas; Muhammad Usman Asad; Jason Gu; Salem Alelyani; Valentina E. Balas; Mohammad Rashid Hussain; Umar Farooq; Ahmed Bilal Awan; Ali Raza; Chunqi Chang;doi: 10.3390/en14010077
Most of the traditional PID tuning methods are heuristic in nature. The heuristic approach-based tuned PID controllers show only nominal performance. In addition, in the case of a digital redesign approach, mapping of the heuristically-designed continuous-time PID controllers into discrete-time PID controllers and in case of the direct digital design approach, mapping of the continuous-time plant (forward converter) into the discrete-time plant, results in frequency distortion (or warping). Besides this, nonlinear elements such as ADC and DAC, and delay in the digital control loop deteriorate the control performance. There is a need to tune conventionally-designed digital controllers to enhance performance. This paper proposes optimized discrete-time PID controllers for a forward DC–DC converter operating in continuous conduction mode (CCM). The considered conventional digital PID controllers designed on the basis of the digital redesign and direct digital approaches are tuned by one of the multivariable unconstrained pattern search methods named Hooke–Jeeves (H–J) search method to ensure excellent output voltage regulation performance against the changes in input voltage and load current. Numerical results show that the H–J-based optimized PID compensated forward converter system shows tremendous improvement in performance compared to its unoptimized counterpart and simulated annealing (SA)-based compensated system, thus justifying the applicability of the H–J method for enhancing the performance.
Energies arrow_drop_down EnergiesOther literature type . 2020License: CC BYFull-Text: http://www.mdpi.com/1996-1073/14/1/77/pdfData sources: Multidisciplinary Digital Publishing Instituteadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.3390/en14010077&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess Routesgold 12 citations 12 popularity Top 10% influence Top 10% impulse Top 10% Powered by BIP!
more_vert Energies arrow_drop_down EnergiesOther literature type . 2020License: CC BYFull-Text: http://www.mdpi.com/1996-1073/14/1/77/pdfData sources: Multidisciplinary Digital Publishing Instituteadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.3390/en14010077&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Other literature type 2022Publisher:MDPI AG Naveed Ashraf; Ghulam Abbas; Nasim Ullah; Ahmad Aziz Al-Ahmadi; Abdul Rehman Yasin; Ahmed Bilal Awan; Mohsin Jamil;doi: 10.3390/en15020667
Variable voltage and frequency are required to govern the torque-speed characteristics of many industrial drive systems. Traditionally, this is achieved with a power converting system implemented with multistage converters. This technology is based on rectifying AC power into DC and then DC into AC with an inverter circuit. The power quality concerns of both conversion stages are tackled by selecting high switching frequency PWM control and harmonics mitigation filters. Also, using a bulky DC-link capacitor is one of the big sources of low system reliability, so this approach increases the conversion losses, circuit, and control complications. The frequency step-down conversion is very attractive with direct AC-AC converters as it has a simple control and circuit structure, but these converters face poor power quality challenges once the output frequency is decreased with respect to an input. In these converters, the total harmonic distortion (THD) of the output voltage becomes very poor once the output frequency is reduced. The problem of high THD of the output is addressed in the power converting circuits implemented with line frequency multi-winding transformers. The required number of output winding and switching devices (diodes and thyristors) increases once the value of the output frequency is decreased. This will increase the overall volume, cost, and losses. The use of a bulky and costly line frequency transformer may be eliminated if AC voltage controllers have non-inverted and inverted voltage buck capabilities, such existing topologies either have complex control schemes or require a large number of operating devices. Therefore, in this research article, a new transformerless frequency step-down converter employing fewer devices is proposed. This approach is realized with a high-frequency controlled rectifier for the required voltage stabilization and a low-frequency inverter bridge for frequency control. Its validation is supported by the results attained from Simulink and practical-based prototypes.
Energies arrow_drop_down EnergiesOther literature type . 2022License: CC BYFull-Text: http://www.mdpi.com/1996-1073/15/2/667/pdfData sources: Multidisciplinary Digital Publishing Instituteadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.3390/en15020667&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess Routesgold 7 citations 7 popularity Top 10% influence Average impulse Top 10% Powered by BIP!
more_vert Energies arrow_drop_down EnergiesOther literature type . 2022License: CC BYFull-Text: http://www.mdpi.com/1996-1073/15/2/667/pdfData sources: Multidisciplinary Digital Publishing Instituteadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.3390/en15020667&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Other literature type 2022Publisher:MDPI AG Naveed Ashraf; Ghulam Abbas; Nasim Ullah; Ahmad Aziz Al-Ahmadi; Abdul Rehman Yasin; Ahmed Bilal Awan; Mohsin Jamil;doi: 10.3390/en15020667
Variable voltage and frequency are required to govern the torque-speed characteristics of many industrial drive systems. Traditionally, this is achieved with a power converting system implemented with multistage converters. This technology is based on rectifying AC power into DC and then DC into AC with an inverter circuit. The power quality concerns of both conversion stages are tackled by selecting high switching frequency PWM control and harmonics mitigation filters. Also, using a bulky DC-link capacitor is one of the big sources of low system reliability, so this approach increases the conversion losses, circuit, and control complications. The frequency step-down conversion is very attractive with direct AC-AC converters as it has a simple control and circuit structure, but these converters face poor power quality challenges once the output frequency is decreased with respect to an input. In these converters, the total harmonic distortion (THD) of the output voltage becomes very poor once the output frequency is reduced. The problem of high THD of the output is addressed in the power converting circuits implemented with line frequency multi-winding transformers. The required number of output winding and switching devices (diodes and thyristors) increases once the value of the output frequency is decreased. This will increase the overall volume, cost, and losses. The use of a bulky and costly line frequency transformer may be eliminated if AC voltage controllers have non-inverted and inverted voltage buck capabilities, such existing topologies either have complex control schemes or require a large number of operating devices. Therefore, in this research article, a new transformerless frequency step-down converter employing fewer devices is proposed. This approach is realized with a high-frequency controlled rectifier for the required voltage stabilization and a low-frequency inverter bridge for frequency control. Its validation is supported by the results attained from Simulink and practical-based prototypes.
Energies arrow_drop_down EnergiesOther literature type . 2022License: CC BYFull-Text: http://www.mdpi.com/1996-1073/15/2/667/pdfData sources: Multidisciplinary Digital Publishing Instituteadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.3390/en15020667&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess Routesgold 7 citations 7 popularity Top 10% influence Average impulse Top 10% Powered by BIP!
more_vert Energies arrow_drop_down EnergiesOther literature type . 2022License: CC BYFull-Text: http://www.mdpi.com/1996-1073/15/2/667/pdfData sources: Multidisciplinary Digital Publishing Instituteadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.3390/en15020667&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article 2025Publisher:MDPI AG Authors: Naveed Ashraf; Ghulam Abbas; Tanveer Yazdan;doi: 10.3390/en18071674
Voltage-controlled AC to DC converters govern the load voltage as per requirement. They may be employed in numerous applications, including battery-charging systems, light dimming, and industrial speed drive systems. The voltage regulation is based on the delay angle control of the thyristors, which has a simple gate control mechanism. Still, their input currents are highly distorted due to the generation of low-order harmonics. Also, their output voltage can only be regulated in step-down mode. The total harmonic distortion (THD) of the input current depends on the relative value of the fundamental frequency components to their non-fundamental component. The power factor (PF) also depends on these values, as well as the phase displacement angle, which is controlled by the firing delay. The improvement in THD and PF can be enhanced by maintaining the sinusoidal characteristics of the input current as much as possible. The use of an AC filter may enhance these characteristics, but filtering the low-order harmonics is a big challenge. This research suggests a novel control and circuit of a single-phase rectifier that may ensure the sinusoidal characteristics of the input current with a dual polarity-controlled output voltage. Thus, it improves the THD and PF for any polarity of the output DC voltage. A practical test circuit is built for the validation of the analytical and computer simulation results.
add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.3390/en18071674&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess Routesgold 1 citations 1 popularity Average influence Average impulse Average Powered by BIP!
more_vert add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.3390/en18071674&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article 2025Publisher:MDPI AG Authors: Naveed Ashraf; Ghulam Abbas; Tanveer Yazdan;doi: 10.3390/en18071674
Voltage-controlled AC to DC converters govern the load voltage as per requirement. They may be employed in numerous applications, including battery-charging systems, light dimming, and industrial speed drive systems. The voltage regulation is based on the delay angle control of the thyristors, which has a simple gate control mechanism. Still, their input currents are highly distorted due to the generation of low-order harmonics. Also, their output voltage can only be regulated in step-down mode. The total harmonic distortion (THD) of the input current depends on the relative value of the fundamental frequency components to their non-fundamental component. The power factor (PF) also depends on these values, as well as the phase displacement angle, which is controlled by the firing delay. The improvement in THD and PF can be enhanced by maintaining the sinusoidal characteristics of the input current as much as possible. The use of an AC filter may enhance these characteristics, but filtering the low-order harmonics is a big challenge. This research suggests a novel control and circuit of a single-phase rectifier that may ensure the sinusoidal characteristics of the input current with a dual polarity-controlled output voltage. Thus, it improves the THD and PF for any polarity of the output DC voltage. A practical test circuit is built for the validation of the analytical and computer simulation results.
add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.3390/en18071674&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess Routesgold 1 citations 1 popularity Average influence Average impulse Average Powered by BIP!
more_vert add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.3390/en18071674&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Journal , Other literature type 2020Publisher:MDPI AG Faisal Tariq; Salem Alelyani; Ghulam Abbas; Ayman Qahmash; Mohammad Rashid Hussain;doi: 10.3390/en13236225
One of the most important concerns in the planning and operation of an electric power generation system is the effective scheduling of all power generation facilities to meet growing power demand. Economic load dispatch (ELD) is a phenomenon where an optimal combination of power generating units is selected in such a way as to minimize the total fuel cost while satisfying the load demand, subject to operational constraints. Different numerical and metaheuristic optimization techniques have gained prominent importance and are widely used to solve the nonlinear problem. Although metaheuristic techniques have a good convergence rate than numerical techniques, however, their implementation seems difficult in the presence of nonlinear and dynamic parameters. This work is devoted to solving the ELD problem with the integration of variable energy resources using a modified directional bat algorithm (dBA). Then the proposed technique is validated via different realistic test cases consisting of thermal and renewable energy sources (RESs). From simulation results, it is observed that dBA reduces the operational cost with less computational time and has better convergence characteristics than that of standard BA and other popular techniques like particle swarm optimization (PSO) and genetic algorithm (GA).
Energies arrow_drop_down EnergiesOther literature type . 2020License: CC BYFull-Text: http://www.mdpi.com/1996-1073/13/23/6225/pdfData sources: Multidisciplinary Digital Publishing Instituteadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.3390/en13236225&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess Routesgold 35 citations 35 popularity Top 10% influence Top 10% impulse Top 10% Powered by BIP!
more_vert Energies arrow_drop_down EnergiesOther literature type . 2020License: CC BYFull-Text: http://www.mdpi.com/1996-1073/13/23/6225/pdfData sources: Multidisciplinary Digital Publishing Instituteadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.3390/en13236225&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Journal , Other literature type 2020Publisher:MDPI AG Faisal Tariq; Salem Alelyani; Ghulam Abbas; Ayman Qahmash; Mohammad Rashid Hussain;doi: 10.3390/en13236225
One of the most important concerns in the planning and operation of an electric power generation system is the effective scheduling of all power generation facilities to meet growing power demand. Economic load dispatch (ELD) is a phenomenon where an optimal combination of power generating units is selected in such a way as to minimize the total fuel cost while satisfying the load demand, subject to operational constraints. Different numerical and metaheuristic optimization techniques have gained prominent importance and are widely used to solve the nonlinear problem. Although metaheuristic techniques have a good convergence rate than numerical techniques, however, their implementation seems difficult in the presence of nonlinear and dynamic parameters. This work is devoted to solving the ELD problem with the integration of variable energy resources using a modified directional bat algorithm (dBA). Then the proposed technique is validated via different realistic test cases consisting of thermal and renewable energy sources (RESs). From simulation results, it is observed that dBA reduces the operational cost with less computational time and has better convergence characteristics than that of standard BA and other popular techniques like particle swarm optimization (PSO) and genetic algorithm (GA).
Energies arrow_drop_down EnergiesOther literature type . 2020License: CC BYFull-Text: http://www.mdpi.com/1996-1073/13/23/6225/pdfData sources: Multidisciplinary Digital Publishing Instituteadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.3390/en13236225&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess Routesgold 35 citations 35 popularity Top 10% influence Top 10% impulse Top 10% Powered by BIP!
more_vert Energies arrow_drop_down EnergiesOther literature type . 2020License: CC BYFull-Text: http://www.mdpi.com/1996-1073/13/23/6225/pdfData sources: Multidisciplinary Digital Publishing Instituteadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.3390/en13236225&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Other literature type 2022Publisher:MDPI AG Naveed Ashraf; Ghulam Abbas; Nasim Ullah; Ahmad Aziz Al-Ahmadi; Alsharef Mohammad; Umar Farooq;doi: 10.3390/app12178582
Single-phase AC–AC converters with a direct power conversion approach are receiving rapid development as they have the ability to produce the regulated non-inverting and inverting form of the input voltage at the output. This feature enables them to correct the line voltage profile once they are used as dynamic voltage restorers if there is an issue of voltage sag or swell in the power distribution system. The regulated non-inverting and inverting form of the output voltage may also be used to obtain the step change in the output frequency, as it is required in many industrial drive systems. However, the realization of such existing circuits needs a large number of components and semiconductor devices, especially switching transistors. The operating control (on and off) of the transistors is directly associated with the use of gate control circuits. The count of such circuits is critical as their volume and cost are much greater than the operating transistors. The number of conducting semiconductor devices in the existing converters is also a big source of high conversion losses, thus leading to lower efficiency. This article introduces a new circuit topology realized only with the use of one full bridge of four IGBTs and a full bridge of four diodes. The use of four switching transistors only requires four gate control circuits that drastically reduce the overall volume and size. All the operating modes of the proposed topology require the conduction of fewer semiconductor devices, which helps to lower the conduction losses. Detailed analysis and description were carried out to validate the attractive features of the developed circuit once compared with the existing circuit topologies. For validation purposes, the computer simulation was carried out on Simulink software. The results obtained from this environment were compared with the real results gained from a practically developed laboratory test bench. The voltage regulation characteristics of the output voltage by employing pulse width modulation (PWM) were confirmed for two values of the non-inverting and inverting outputs.
Applied Sciences arrow_drop_down Applied SciencesOther literature type . 2022License: CC BYFull-Text: http://www.mdpi.com/2076-3417/12/17/8582/pdfData sources: Multidisciplinary Digital Publishing Instituteadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.3390/app12178582&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess Routesgold 2 citations 2 popularity Average influence Average impulse Average Powered by BIP!
more_vert Applied Sciences arrow_drop_down Applied SciencesOther literature type . 2022License: CC BYFull-Text: http://www.mdpi.com/2076-3417/12/17/8582/pdfData sources: Multidisciplinary Digital Publishing Instituteadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.3390/app12178582&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Other literature type 2022Publisher:MDPI AG Naveed Ashraf; Ghulam Abbas; Nasim Ullah; Ahmad Aziz Al-Ahmadi; Alsharef Mohammad; Umar Farooq;doi: 10.3390/app12178582
Single-phase AC–AC converters with a direct power conversion approach are receiving rapid development as they have the ability to produce the regulated non-inverting and inverting form of the input voltage at the output. This feature enables them to correct the line voltage profile once they are used as dynamic voltage restorers if there is an issue of voltage sag or swell in the power distribution system. The regulated non-inverting and inverting form of the output voltage may also be used to obtain the step change in the output frequency, as it is required in many industrial drive systems. However, the realization of such existing circuits needs a large number of components and semiconductor devices, especially switching transistors. The operating control (on and off) of the transistors is directly associated with the use of gate control circuits. The count of such circuits is critical as their volume and cost are much greater than the operating transistors. The number of conducting semiconductor devices in the existing converters is also a big source of high conversion losses, thus leading to lower efficiency. This article introduces a new circuit topology realized only with the use of one full bridge of four IGBTs and a full bridge of four diodes. The use of four switching transistors only requires four gate control circuits that drastically reduce the overall volume and size. All the operating modes of the proposed topology require the conduction of fewer semiconductor devices, which helps to lower the conduction losses. Detailed analysis and description were carried out to validate the attractive features of the developed circuit once compared with the existing circuit topologies. For validation purposes, the computer simulation was carried out on Simulink software. The results obtained from this environment were compared with the real results gained from a practically developed laboratory test bench. The voltage regulation characteristics of the output voltage by employing pulse width modulation (PWM) were confirmed for two values of the non-inverting and inverting outputs.
Applied Sciences arrow_drop_down Applied SciencesOther literature type . 2022License: CC BYFull-Text: http://www.mdpi.com/2076-3417/12/17/8582/pdfData sources: Multidisciplinary Digital Publishing Instituteadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.3390/app12178582&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess Routesgold 2 citations 2 popularity Average influence Average impulse Average Powered by BIP!
more_vert Applied Sciences arrow_drop_down Applied SciencesOther literature type . 2022License: CC BYFull-Text: http://www.mdpi.com/2076-3417/12/17/8582/pdfData sources: Multidisciplinary Digital Publishing Instituteadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.3390/app12178582&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Other literature type 2021Publisher:MDPI AG Saqib Khalid; Ali Raza; Umar Alqasemi; Nebras Sobahi; Muhammad Zain Yousaf; Ghulam Abbas; Mohsin Jamil;doi: 10.3390/en14238148
One of the technical challenges that needs to be addressed for the future of the multi-terminal high voltage direct current (M-HVDC) grid is DC fault isolation. In this regard, HVDC circuit breakers (DCCBs), particularly hybrid circuit breakers (H-DCCBs), are paramount. The H-DCCB, proposed by the ABB, has the potential to ensure a reliable and safer grid operation, mainly due to its millisecond-level current interruption capability and lower on-state losses as compared to electromechanical and solid-state based DCCBs. This paper aims to study and evaluate the operational parameters, e.g., electrical, and thermal stresses on the IGBT valves and energy absorbed by the surge arrestors within H-DCCB during different DC fault scenarios. A comprehensive set of modeling requirements matching with operational conditions are developed. A meshed four-terminal HVDC test bench consisting of twelve H-DCCBs is designed in PSCAD/EMTDC to study the impacts of the M-HVDC grid on the operational parameters of H-DCCB. Thus, the system under study is tested for different current interruption scenarios under a (i) low impedance fault current and (ii) high impedance fault current. Both grid-level and self-level protection strategies are implemented for each type of DC fault.
Energies arrow_drop_down EnergiesOther literature type . 2021License: CC BYFull-Text: http://www.mdpi.com/1996-1073/14/23/8148/pdfData sources: Multidisciplinary Digital Publishing Instituteadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.3390/en14238148&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess Routesgold 16 citations 16 popularity Top 10% influence Top 10% impulse Top 10% Powered by BIP!
more_vert Energies arrow_drop_down EnergiesOther literature type . 2021License: CC BYFull-Text: http://www.mdpi.com/1996-1073/14/23/8148/pdfData sources: Multidisciplinary Digital Publishing Instituteadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.3390/en14238148&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Other literature type 2021Publisher:MDPI AG Saqib Khalid; Ali Raza; Umar Alqasemi; Nebras Sobahi; Muhammad Zain Yousaf; Ghulam Abbas; Mohsin Jamil;doi: 10.3390/en14238148
One of the technical challenges that needs to be addressed for the future of the multi-terminal high voltage direct current (M-HVDC) grid is DC fault isolation. In this regard, HVDC circuit breakers (DCCBs), particularly hybrid circuit breakers (H-DCCBs), are paramount. The H-DCCB, proposed by the ABB, has the potential to ensure a reliable and safer grid operation, mainly due to its millisecond-level current interruption capability and lower on-state losses as compared to electromechanical and solid-state based DCCBs. This paper aims to study and evaluate the operational parameters, e.g., electrical, and thermal stresses on the IGBT valves and energy absorbed by the surge arrestors within H-DCCB during different DC fault scenarios. A comprehensive set of modeling requirements matching with operational conditions are developed. A meshed four-terminal HVDC test bench consisting of twelve H-DCCBs is designed in PSCAD/EMTDC to study the impacts of the M-HVDC grid on the operational parameters of H-DCCB. Thus, the system under study is tested for different current interruption scenarios under a (i) low impedance fault current and (ii) high impedance fault current. Both grid-level and self-level protection strategies are implemented for each type of DC fault.
Energies arrow_drop_down EnergiesOther literature type . 2021License: CC BYFull-Text: http://www.mdpi.com/1996-1073/14/23/8148/pdfData sources: Multidisciplinary Digital Publishing Instituteadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.3390/en14238148&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess Routesgold 16 citations 16 popularity Top 10% influence Top 10% impulse Top 10% Powered by BIP!
more_vert Energies arrow_drop_down EnergiesOther literature type . 2021License: CC BYFull-Text: http://www.mdpi.com/1996-1073/14/23/8148/pdfData sources: Multidisciplinary Digital Publishing Instituteadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.3390/en14238148&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Conference object , Article 2017Publisher:IEEE Authors: Ghulam Abbas; Hafiz M. Ashraf; Saif Ur Rehman; Usman Ali;The importance of Conventional Current Transformer (CCT) for the monitoring and protection in power systems is not ignorable. Although there has been an extensive use of CCT for a long time but a lot of problems and issues such as inrush current, saturation, current transformer ratios, etc. faced by CCT make its use quite limited. Issues arising in CCTs have pulled the attraction of researchers and protection engineers towards a new instrument technology based on Opto-Electromagnetics. An Optical Current Transformer (OCT) model based on the simulation has been proposed here which follows the Faraday's law of Electromagnetics. The use of OCT will resolve almost all issues that were being faced by CCTs. So this new designed model of OCT can replace easily the CCTs for both the protection and metering purposes. This simulation model of OCT using operational amplifiers is being proposed here just to motivate the protection and design engineers especially in Pakistan to adopt the new technology of OCT for the measurement of current in place of CCT. In addition to resolving all issues related to CCT, OCT will also make the power quality better. Three types of outputs can be obtained from an OCT which are: low energy analog output (LEA), high energy analog output (HEA) and digital output. Due to sampling rate limitations involved, a digital output is hard to use to avail the wider bandwidth option. To use all the benefits of an OCT, a low energy output signal will be used here for the simulation requirement here. After the required OCT model development, simulation results will be included to prove that CCT can be replaced by the OCT.
https://doi.org/10.1... arrow_drop_down https://doi.org/10.1109/icee.2...Conference object . 2017 . Peer-reviewedLicense: STM Policy #29Data sources: Crossrefadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1109/icee.2017.7893440&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eu4 citations 4 popularity Top 10% influence Average impulse Average Powered by BIP!
more_vert https://doi.org/10.1... arrow_drop_down https://doi.org/10.1109/icee.2...Conference object . 2017 . Peer-reviewedLicense: STM Policy #29Data sources: Crossrefadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1109/icee.2017.7893440&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Conference object , Article 2017Publisher:IEEE Authors: Ghulam Abbas; Hafiz M. Ashraf; Saif Ur Rehman; Usman Ali;The importance of Conventional Current Transformer (CCT) for the monitoring and protection in power systems is not ignorable. Although there has been an extensive use of CCT for a long time but a lot of problems and issues such as inrush current, saturation, current transformer ratios, etc. faced by CCT make its use quite limited. Issues arising in CCTs have pulled the attraction of researchers and protection engineers towards a new instrument technology based on Opto-Electromagnetics. An Optical Current Transformer (OCT) model based on the simulation has been proposed here which follows the Faraday's law of Electromagnetics. The use of OCT will resolve almost all issues that were being faced by CCTs. So this new designed model of OCT can replace easily the CCTs for both the protection and metering purposes. This simulation model of OCT using operational amplifiers is being proposed here just to motivate the protection and design engineers especially in Pakistan to adopt the new technology of OCT for the measurement of current in place of CCT. In addition to resolving all issues related to CCT, OCT will also make the power quality better. Three types of outputs can be obtained from an OCT which are: low energy analog output (LEA), high energy analog output (HEA) and digital output. Due to sampling rate limitations involved, a digital output is hard to use to avail the wider bandwidth option. To use all the benefits of an OCT, a low energy output signal will be used here for the simulation requirement here. After the required OCT model development, simulation results will be included to prove that CCT can be replaced by the OCT.
https://doi.org/10.1... arrow_drop_down https://doi.org/10.1109/icee.2...Conference object . 2017 . Peer-reviewedLicense: STM Policy #29Data sources: Crossrefadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1109/icee.2017.7893440&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eu4 citations 4 popularity Top 10% influence Average impulse Average Powered by BIP!
more_vert https://doi.org/10.1... arrow_drop_down https://doi.org/10.1109/icee.2...Conference object . 2017 . Peer-reviewedLicense: STM Policy #29Data sources: Crossrefadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1109/icee.2017.7893440&type=result"></script>'); --> </script>
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description Publicationkeyboard_double_arrow_right Article , Other literature type , Journal 2020Publisher:Institute of Electrical and Electronics Engineers (IEEE) Muhammad Arsalan Ilyas; Ghulam Abbas; Thamer Alquthami; Muhammad Awais; Muhammad Babar Rasheed;En el pasado reciente, para satisfacer la creciente demanda energética de electricidad, la integración de recursos energéticos renovables (RES) en una red eléctrica es un centro de atención. Además, la integración óptima de estas RES hace que esta tarea sea más desafiante debido a su naturaleza intermitente. Por lo tanto, en el presente estudio, el problema del flujo de energía se trata como un problema de flujo de energía óptimo multiobjetivo y multiobjetivo (MOOPF) junto con la integración óptima de las RES. Si bien, los objetivos de MOOPF son triples: costo general de generación, pérdida real de energía del sistema y reducción de emisiones de carbono de fuentes térmicas. En este trabajo, se presenta una técnica computacionalmente eficiente para encontrar los valores más factibles de diferentes variables de control del sistema de energía que tienen RES distribuidas. Por lo tanto, la satisfacción de la restricción se logra mediante el uso de un enfoque de función de penalización (PFA) y para desarrollar aún más el verdadero frente de Pareto (PF), el método de dominancia de Pareto se utiliza para categorizar la solución dominante de Pareto. Además, para tratar la naturaleza intermitente de RES, la función de densidad de probabilidad (PDF) y los modelos de potencia estocástica de RES se utilizan para calcular la potencia disponible de RES. Dado que, los objetivos del problema MOOPF son de naturaleza conflictiva, después de tener el conjunto de soluciones no dominantes, se ha utilizado el enfoque de la función de membresía difusa (FMF) para extraer la mejor solución de compromiso (BCS). Para probar la validez de la técnica desarrollada, el sistema de bus IEEE-30 se ha modificado con la integración de RES y el problema de optimización final se resuelve utilizando el algoritmo de optimización de enjambre de partículas (PSO). Los resultados de la simulación muestran el logro de la técnica propuesta que gestiona el valor del costo del combustible a largo plazo con los valores óptimos de otros objetivos. De plus, l'intégration optimale de ces sources d'énergie rend cette tâche plus difficile en raison de leur nature intermittente. Par conséquent, dans la présente étude, le problème du flux d'énergie est traité comme un problème de flux d'énergie optimal multi-contrainte et multi-objectif (MOOPF) avec une intégration optimale des sources d'énergie. Par conséquent, les objectifs du MOOPF sont triples : coût de production global, perte d'énergie réelle du système et réduction des émissions de carbone de sources thermiques.Dans ce travail, une technique efficace sur le plan informatique est présentée pour trouver les valeurs les plus réalisables de différentes variables de contrôle du système d'alimentation ayant des sources d'énergie renouvelables distribuées. Par conséquent, la satisfaction des contraintes est obtenue en utilisant l'approche de la fonction de pénalité (PFA) et pour développer davantage le vrai front de Pareto (PF), la méthode de dominance de Pareto est utilisée pour catégoriser la solution de dominance de Pareto. De plus, pour traiter la nature intermittente des sources d'énergie renouvelables, la fonction de densité de probabilité (PDF) et les modèles de puissance stochastique des sources d'énergie renouvelables sont utilisés pour calculer la puissance disponible à partir des sources d'énergie renouvelables. Depuis, les objectifs du problème MOOPF sont de nature conflictuelle, après avoir utilisé l'approche de la fonction d'appartenance floue (FMF) de l'ensemble de solutions non dominantes pour extraire la meilleure solution de compromis (BCS). Pour tester la validité de la technique développée, le système de bus IEEE-30 a été modifié avec intégration de res et le problème d'optimisation finale est résolu en utilisant l'algorithme d'optimisation d'essaim de particules (PSO). Les résultats de la simulation montrent la réalisation de la technique proposée en gérant la valeur du coût du carburant longtemps avec les valeurs optimales d'autres objectifs. In recent past, to meet the growing energy demand of electricity, integration of renewable energy resources (RESs) in an electrical network is a center of attention.Furthermore, optimal integration of these RESs make this task more challenging because of their intermittent nature.Therefore, in the present study power flow problem is treated as a multi-constraint, multi-objective optimal power flow (MOOPF) problem along with optimal integration of RESs.Whereas, the objectives of MOOPF are threefold: overall generation cost, real power loss of system and carbon emission reduction of thermal sources.In this work, a computationally efficient technique is presented to find the most feasible values of different control variables of the power system having distributed RESs.Whereas, the constraint satisfaction is achieved by using penalty function approach (PFA) and to further develop true Pareto front (PF), Pareto dominance method is used to categorize Pareto dominate solution.Moreover, to deal with intermittent nature of RES, probability density function (PDF) and stochastic power models of RES are used to calculate available power from RESs.Since, objectives of the MOOPF problem are conflicting in nature, after having the set of non-dominating solutions fuzzy membership function (FMF) approach has been used to extract the best compromise solution (BCS).To test the validity of developed technique, the IEEE-30 bus system has been modified with integration of RESs and final optimization problem is solved by using particle swarm optimization (PSO) algorithm.Simulation results show the achievement of proposed technique managing fuel cost value long with the optimal values of other objectives. في الماضي القريب، لتلبية الطلب المتزايد على الطاقة الكهربائية، يعد دمج موارد الطاقة المتجددة (RESs) في شبكة كهربائية مركزًا للاهتمام. علاوة على ذلك، فإن التكامل الأمثل لهذه الموارد يجعل هذه المهمة أكثر صعوبة بسبب طبيعتها المتقطعة. لذلك، في هذه الدراسة، يتم التعامل مع مشكلة تدفق الطاقة على أنها مشكلة تدفق طاقة مثلى متعددة القيود ومتعددة الأهداف (MOOPF) جنبًا إلى جنب مع التكامل الأمثل لـ RESs. في حين أن أهداف MOOPF ثلاثية الجوانب: تكلفة التوليد الإجمالية، وفقدان الطاقة الحقيقي للنظام وتقليل انبعاثات الكربون من المصادر الحرارية. في هذا العمل، يتم تقديم تقنية فعالة حسابيًا للعثور على القيم الأكثر جدوى لمتغيرات التحكم المختلفة لنظام الطاقة الذي قام بتوزيع RES. في حين يتم تحقيق الرضا عن القيد باستخدام نهج دالة العقوبة (PFA) ولمواصلة تطوير جبهة باريتو الحقيقية (PF)، يتم استخدام طريقة هيمنة باريتو لتصنيف حل باريتو المسيطر. علاوة على ذلك، للتعامل مع الطبيعة المتقطعة لـ RES، يتم استخدام دالة الكثافة الاحتمالية (PDF) ونماذج الطاقة العشوائية لـ RES لحساب الطاقة المتاحة من RESs. منذ ذلك الحين، أهداف مشكلة MOOPF هي متضاربة في طبيعتها، بعد استخدام مجموعة من الحلول غير المهيمنة تم استخدام نهج وظيفة العضوية الغامضة (FMF) لاستخراج أفضل حل وسط (BCS). لاختبار صحة التقنية المطورة، تم تعديل نظام ناقل IEEE -30 مع دمج RESs ويتم حل مشكلة التحسين النهائي باستخدام خوارزمية تحسين سرب الجسيمات (PSO). تظهر نتائج المحاكاة تحقيق التقنية المقترحة لإدارة قيمة تكلفة الوقود لفترة طويلة مع القيم المثلى للأهداف الأخرى.
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For further information contact us at helpdesk@openaire.euAccess Routesgold 20 citations 20 popularity Top 10% influence Average impulse Top 10% Powered by BIP!
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Other literature type , Journal 2020Publisher:Institute of Electrical and Electronics Engineers (IEEE) Muhammad Arsalan Ilyas; Ghulam Abbas; Thamer Alquthami; Muhammad Awais; Muhammad Babar Rasheed;En el pasado reciente, para satisfacer la creciente demanda energética de electricidad, la integración de recursos energéticos renovables (RES) en una red eléctrica es un centro de atención. Además, la integración óptima de estas RES hace que esta tarea sea más desafiante debido a su naturaleza intermitente. Por lo tanto, en el presente estudio, el problema del flujo de energía se trata como un problema de flujo de energía óptimo multiobjetivo y multiobjetivo (MOOPF) junto con la integración óptima de las RES. Si bien, los objetivos de MOOPF son triples: costo general de generación, pérdida real de energía del sistema y reducción de emisiones de carbono de fuentes térmicas. En este trabajo, se presenta una técnica computacionalmente eficiente para encontrar los valores más factibles de diferentes variables de control del sistema de energía que tienen RES distribuidas. Por lo tanto, la satisfacción de la restricción se logra mediante el uso de un enfoque de función de penalización (PFA) y para desarrollar aún más el verdadero frente de Pareto (PF), el método de dominancia de Pareto se utiliza para categorizar la solución dominante de Pareto. Además, para tratar la naturaleza intermitente de RES, la función de densidad de probabilidad (PDF) y los modelos de potencia estocástica de RES se utilizan para calcular la potencia disponible de RES. Dado que, los objetivos del problema MOOPF son de naturaleza conflictiva, después de tener el conjunto de soluciones no dominantes, se ha utilizado el enfoque de la función de membresía difusa (FMF) para extraer la mejor solución de compromiso (BCS). Para probar la validez de la técnica desarrollada, el sistema de bus IEEE-30 se ha modificado con la integración de RES y el problema de optimización final se resuelve utilizando el algoritmo de optimización de enjambre de partículas (PSO). Los resultados de la simulación muestran el logro de la técnica propuesta que gestiona el valor del costo del combustible a largo plazo con los valores óptimos de otros objetivos. De plus, l'intégration optimale de ces sources d'énergie rend cette tâche plus difficile en raison de leur nature intermittente. Par conséquent, dans la présente étude, le problème du flux d'énergie est traité comme un problème de flux d'énergie optimal multi-contrainte et multi-objectif (MOOPF) avec une intégration optimale des sources d'énergie. Par conséquent, les objectifs du MOOPF sont triples : coût de production global, perte d'énergie réelle du système et réduction des émissions de carbone de sources thermiques.Dans ce travail, une technique efficace sur le plan informatique est présentée pour trouver les valeurs les plus réalisables de différentes variables de contrôle du système d'alimentation ayant des sources d'énergie renouvelables distribuées. Par conséquent, la satisfaction des contraintes est obtenue en utilisant l'approche de la fonction de pénalité (PFA) et pour développer davantage le vrai front de Pareto (PF), la méthode de dominance de Pareto est utilisée pour catégoriser la solution de dominance de Pareto. De plus, pour traiter la nature intermittente des sources d'énergie renouvelables, la fonction de densité de probabilité (PDF) et les modèles de puissance stochastique des sources d'énergie renouvelables sont utilisés pour calculer la puissance disponible à partir des sources d'énergie renouvelables. Depuis, les objectifs du problème MOOPF sont de nature conflictuelle, après avoir utilisé l'approche de la fonction d'appartenance floue (FMF) de l'ensemble de solutions non dominantes pour extraire la meilleure solution de compromis (BCS). Pour tester la validité de la technique développée, le système de bus IEEE-30 a été modifié avec intégration de res et le problème d'optimisation finale est résolu en utilisant l'algorithme d'optimisation d'essaim de particules (PSO). Les résultats de la simulation montrent la réalisation de la technique proposée en gérant la valeur du coût du carburant longtemps avec les valeurs optimales d'autres objectifs. In recent past, to meet the growing energy demand of electricity, integration of renewable energy resources (RESs) in an electrical network is a center of attention.Furthermore, optimal integration of these RESs make this task more challenging because of their intermittent nature.Therefore, in the present study power flow problem is treated as a multi-constraint, multi-objective optimal power flow (MOOPF) problem along with optimal integration of RESs.Whereas, the objectives of MOOPF are threefold: overall generation cost, real power loss of system and carbon emission reduction of thermal sources.In this work, a computationally efficient technique is presented to find the most feasible values of different control variables of the power system having distributed RESs.Whereas, the constraint satisfaction is achieved by using penalty function approach (PFA) and to further develop true Pareto front (PF), Pareto dominance method is used to categorize Pareto dominate solution.Moreover, to deal with intermittent nature of RES, probability density function (PDF) and stochastic power models of RES are used to calculate available power from RESs.Since, objectives of the MOOPF problem are conflicting in nature, after having the set of non-dominating solutions fuzzy membership function (FMF) approach has been used to extract the best compromise solution (BCS).To test the validity of developed technique, the IEEE-30 bus system has been modified with integration of RESs and final optimization problem is solved by using particle swarm optimization (PSO) algorithm.Simulation results show the achievement of proposed technique managing fuel cost value long with the optimal values of other objectives. في الماضي القريب، لتلبية الطلب المتزايد على الطاقة الكهربائية، يعد دمج موارد الطاقة المتجددة (RESs) في شبكة كهربائية مركزًا للاهتمام. علاوة على ذلك، فإن التكامل الأمثل لهذه الموارد يجعل هذه المهمة أكثر صعوبة بسبب طبيعتها المتقطعة. لذلك، في هذه الدراسة، يتم التعامل مع مشكلة تدفق الطاقة على أنها مشكلة تدفق طاقة مثلى متعددة القيود ومتعددة الأهداف (MOOPF) جنبًا إلى جنب مع التكامل الأمثل لـ RESs. في حين أن أهداف MOOPF ثلاثية الجوانب: تكلفة التوليد الإجمالية، وفقدان الطاقة الحقيقي للنظام وتقليل انبعاثات الكربون من المصادر الحرارية. في هذا العمل، يتم تقديم تقنية فعالة حسابيًا للعثور على القيم الأكثر جدوى لمتغيرات التحكم المختلفة لنظام الطاقة الذي قام بتوزيع RES. في حين يتم تحقيق الرضا عن القيد باستخدام نهج دالة العقوبة (PFA) ولمواصلة تطوير جبهة باريتو الحقيقية (PF)، يتم استخدام طريقة هيمنة باريتو لتصنيف حل باريتو المسيطر. علاوة على ذلك، للتعامل مع الطبيعة المتقطعة لـ RES، يتم استخدام دالة الكثافة الاحتمالية (PDF) ونماذج الطاقة العشوائية لـ RES لحساب الطاقة المتاحة من RESs. منذ ذلك الحين، أهداف مشكلة MOOPF هي متضاربة في طبيعتها، بعد استخدام مجموعة من الحلول غير المهيمنة تم استخدام نهج وظيفة العضوية الغامضة (FMF) لاستخراج أفضل حل وسط (BCS). لاختبار صحة التقنية المطورة، تم تعديل نظام ناقل IEEE -30 مع دمج RESs ويتم حل مشكلة التحسين النهائي باستخدام خوارزمية تحسين سرب الجسيمات (PSO). تظهر نتائج المحاكاة تحقيق التقنية المقترحة لإدارة قيمة تكلفة الوقود لفترة طويلة مع القيم المثلى للأهداف الأخرى.
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For further information contact us at helpdesk@openaire.euAccess Routesgold 20 citations 20 popularity Top 10% influence Average impulse Top 10% Powered by BIP!
more_vert add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Preprint 2024 Australia, Saudi Arabia, Saudi ArabiaPublisher:Institute of Electrical and Electronics Engineers (IEEE) Authors: Muhammad Wasim Nawaz; Abdesselam Bouzerdoum; Muhammad Mahboob Ur Rahman; Ghulam Abbas; +1 AuthorsMuhammad Wasim Nawaz; Abdesselam Bouzerdoum; Muhammad Mahboob Ur Rahman; Ghulam Abbas; Faizan Rashid;handle: 10754/697907
Optical flow is the pattern of apparent motion of objects in a scene. The computation of optical flow is a critical component in numerous computer vision tasks such as object detection, visual object tracking, and activity recognition. Despite a lot of research, efficiently managing abrupt changes in motion remains a challenge in motion estimation. This paper proposes novel variational regularization methods to address this problem since they allow combining different mathematical concepts into a joint energy minimization framework. In this work, we incorporate concepts from signal sparsity into variational regularization for motion estimation. The proposed regularization uses a robust l1 norm, which promotes sparsity and handles motion discontinuities. By using this regularization, we promote the sparsity of the optical flow gradient. This sparsity helps recover a signal even with just a few measurements. We explore recovering optical flow from a limited set of linear measurements using this regularizer. Our findings show that leveraging the sparsity of the derivatives of optical flow reduces computational complexity and memory needs. Comment: 12 pages, 9 figures, and 3 tables
King Abdullah Univer... arrow_drop_down King Abdullah University of Science and Technology: KAUST RepositoryArticle . 2024License: CC BYData sources: Bielefeld Academic Search Engine (BASE)University of Wollongong, Australia: Research OnlineArticle . 2024Data sources: Bielefeld Academic Search Engine (BASE)add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1109/access.2024.3382818&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess RoutesGreen gold 1 citations 1 popularity Average influence Average impulse Average Powered by BIP!
more_vert King Abdullah Univer... arrow_drop_down King Abdullah University of Science and Technology: KAUST RepositoryArticle . 2024License: CC BYData sources: Bielefeld Academic Search Engine (BASE)University of Wollongong, Australia: Research OnlineArticle . 2024Data sources: Bielefeld Academic Search Engine (BASE)add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1109/access.2024.3382818&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Preprint 2024 Australia, Saudi Arabia, Saudi ArabiaPublisher:Institute of Electrical and Electronics Engineers (IEEE) Authors: Muhammad Wasim Nawaz; Abdesselam Bouzerdoum; Muhammad Mahboob Ur Rahman; Ghulam Abbas; +1 AuthorsMuhammad Wasim Nawaz; Abdesselam Bouzerdoum; Muhammad Mahboob Ur Rahman; Ghulam Abbas; Faizan Rashid;handle: 10754/697907
Optical flow is the pattern of apparent motion of objects in a scene. The computation of optical flow is a critical component in numerous computer vision tasks such as object detection, visual object tracking, and activity recognition. Despite a lot of research, efficiently managing abrupt changes in motion remains a challenge in motion estimation. This paper proposes novel variational regularization methods to address this problem since they allow combining different mathematical concepts into a joint energy minimization framework. In this work, we incorporate concepts from signal sparsity into variational regularization for motion estimation. The proposed regularization uses a robust l1 norm, which promotes sparsity and handles motion discontinuities. By using this regularization, we promote the sparsity of the optical flow gradient. This sparsity helps recover a signal even with just a few measurements. We explore recovering optical flow from a limited set of linear measurements using this regularizer. Our findings show that leveraging the sparsity of the derivatives of optical flow reduces computational complexity and memory needs. Comment: 12 pages, 9 figures, and 3 tables
King Abdullah Univer... arrow_drop_down King Abdullah University of Science and Technology: KAUST RepositoryArticle . 2024License: CC BYData sources: Bielefeld Academic Search Engine (BASE)University of Wollongong, Australia: Research OnlineArticle . 2024Data sources: Bielefeld Academic Search Engine (BASE)add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1109/access.2024.3382818&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess RoutesGreen gold 1 citations 1 popularity Average influence Average impulse Average Powered by BIP!
more_vert King Abdullah Univer... arrow_drop_down King Abdullah University of Science and Technology: KAUST RepositoryArticle . 2024License: CC BYData sources: Bielefeld Academic Search Engine (BASE)University of Wollongong, Australia: Research OnlineArticle . 2024Data sources: Bielefeld Academic Search Engine (BASE)add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1109/access.2024.3382818&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Journal 2017Publisher:Institute of Electrical and Electronics Engineers (IEEE) Funded by:NSERCNSERCGhulam Abbas; Jason Gu; Umar Farooq; Ali Raza; Muhammad Usman Asad; M. E. El-Hawary;A number of modern metaheuristic optimization techniques are being exploited to work out a single-objective economic dispatch (ED) problem. The dispatch problems even become more complicated and complex when they consider operational and system constraints, such as network transmission losses, valve-point loading effects originating due to sequential opening of a number of steam admission valves to meet the ever-increasing demand, ramp rate limits, prohibited operating zones, multiple fuel options, spinning reserve, and so on. The heavy constraints make the otherwise convex linear smooth dispatch problem as highly nonconvex nonlinear nonsmooth one. Finding optimal solution for such kind of a constrained nonlinear problem through the deterministic numerical and convex characteristics-based optimization techniques is a difficult task to accomplish. Researchers have frequently employed one of the metaheuristic optimization techniques with powerful computational ability named particle swarm optimization (PSO) to deal with this rather a complicated and toilsome dispatch problem. In Part I of the two-part paper, a comprehensive review or a survey of PSO and its modified versions (involve alterations in the basic structure of PSO) to resolve the constrained ED problem is presented. Part II covers purely the survey of hybrid forms of PSO (hybridization of PSO with other optimization techniques) to tackle the ED problem. The survey is presented in such a way that readers may understand how PSO can be made computationally more efficient.
add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1109/access.2017.2768522&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess Routesgold 110 citations 110 popularity Top 1% influence Top 10% impulse Top 1% Powered by BIP!
more_vert add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1109/access.2017.2768522&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Journal 2017Publisher:Institute of Electrical and Electronics Engineers (IEEE) Funded by:NSERCNSERCGhulam Abbas; Jason Gu; Umar Farooq; Ali Raza; Muhammad Usman Asad; M. E. El-Hawary;A number of modern metaheuristic optimization techniques are being exploited to work out a single-objective economic dispatch (ED) problem. The dispatch problems even become more complicated and complex when they consider operational and system constraints, such as network transmission losses, valve-point loading effects originating due to sequential opening of a number of steam admission valves to meet the ever-increasing demand, ramp rate limits, prohibited operating zones, multiple fuel options, spinning reserve, and so on. The heavy constraints make the otherwise convex linear smooth dispatch problem as highly nonconvex nonlinear nonsmooth one. Finding optimal solution for such kind of a constrained nonlinear problem through the deterministic numerical and convex characteristics-based optimization techniques is a difficult task to accomplish. Researchers have frequently employed one of the metaheuristic optimization techniques with powerful computational ability named particle swarm optimization (PSO) to deal with this rather a complicated and toilsome dispatch problem. In Part I of the two-part paper, a comprehensive review or a survey of PSO and its modified versions (involve alterations in the basic structure of PSO) to resolve the constrained ED problem is presented. Part II covers purely the survey of hybrid forms of PSO (hybridization of PSO with other optimization techniques) to tackle the ED problem. The survey is presented in such a way that readers may understand how PSO can be made computationally more efficient.
add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1109/access.2017.2768522&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess Routesgold 110 citations 110 popularity Top 1% influence Top 10% impulse Top 1% Powered by BIP!
more_vert add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1109/access.2017.2768522&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Journal , Other literature type 2020Publisher:MDPI AG Ghulam Abbas; Muhammad Usman Asad; Jason Gu; Salem Alelyani; Valentina E. Balas; Mohammad Rashid Hussain; Umar Farooq; Ahmed Bilal Awan; Ali Raza; Chunqi Chang;doi: 10.3390/en14010077
Most of the traditional PID tuning methods are heuristic in nature. The heuristic approach-based tuned PID controllers show only nominal performance. In addition, in the case of a digital redesign approach, mapping of the heuristically-designed continuous-time PID controllers into discrete-time PID controllers and in case of the direct digital design approach, mapping of the continuous-time plant (forward converter) into the discrete-time plant, results in frequency distortion (or warping). Besides this, nonlinear elements such as ADC and DAC, and delay in the digital control loop deteriorate the control performance. There is a need to tune conventionally-designed digital controllers to enhance performance. This paper proposes optimized discrete-time PID controllers for a forward DC–DC converter operating in continuous conduction mode (CCM). The considered conventional digital PID controllers designed on the basis of the digital redesign and direct digital approaches are tuned by one of the multivariable unconstrained pattern search methods named Hooke–Jeeves (H–J) search method to ensure excellent output voltage regulation performance against the changes in input voltage and load current. Numerical results show that the H–J-based optimized PID compensated forward converter system shows tremendous improvement in performance compared to its unoptimized counterpart and simulated annealing (SA)-based compensated system, thus justifying the applicability of the H–J method for enhancing the performance.
Energies arrow_drop_down EnergiesOther literature type . 2020License: CC BYFull-Text: http://www.mdpi.com/1996-1073/14/1/77/pdfData sources: Multidisciplinary Digital Publishing Instituteadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.3390/en14010077&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess Routesgold 12 citations 12 popularity Top 10% influence Top 10% impulse Top 10% Powered by BIP!
more_vert Energies arrow_drop_down EnergiesOther literature type . 2020License: CC BYFull-Text: http://www.mdpi.com/1996-1073/14/1/77/pdfData sources: Multidisciplinary Digital Publishing Instituteadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.3390/en14010077&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Journal , Other literature type 2020Publisher:MDPI AG Ghulam Abbas; Muhammad Usman Asad; Jason Gu; Salem Alelyani; Valentina E. Balas; Mohammad Rashid Hussain; Umar Farooq; Ahmed Bilal Awan; Ali Raza; Chunqi Chang;doi: 10.3390/en14010077
Most of the traditional PID tuning methods are heuristic in nature. The heuristic approach-based tuned PID controllers show only nominal performance. In addition, in the case of a digital redesign approach, mapping of the heuristically-designed continuous-time PID controllers into discrete-time PID controllers and in case of the direct digital design approach, mapping of the continuous-time plant (forward converter) into the discrete-time plant, results in frequency distortion (or warping). Besides this, nonlinear elements such as ADC and DAC, and delay in the digital control loop deteriorate the control performance. There is a need to tune conventionally-designed digital controllers to enhance performance. This paper proposes optimized discrete-time PID controllers for a forward DC–DC converter operating in continuous conduction mode (CCM). The considered conventional digital PID controllers designed on the basis of the digital redesign and direct digital approaches are tuned by one of the multivariable unconstrained pattern search methods named Hooke–Jeeves (H–J) search method to ensure excellent output voltage regulation performance against the changes in input voltage and load current. Numerical results show that the H–J-based optimized PID compensated forward converter system shows tremendous improvement in performance compared to its unoptimized counterpart and simulated annealing (SA)-based compensated system, thus justifying the applicability of the H–J method for enhancing the performance.
Energies arrow_drop_down EnergiesOther literature type . 2020License: CC BYFull-Text: http://www.mdpi.com/1996-1073/14/1/77/pdfData sources: Multidisciplinary Digital Publishing Instituteadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.3390/en14010077&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess Routesgold 12 citations 12 popularity Top 10% influence Top 10% impulse Top 10% Powered by BIP!
more_vert Energies arrow_drop_down EnergiesOther literature type . 2020License: CC BYFull-Text: http://www.mdpi.com/1996-1073/14/1/77/pdfData sources: Multidisciplinary Digital Publishing Instituteadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.3390/en14010077&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Other literature type 2022Publisher:MDPI AG Naveed Ashraf; Ghulam Abbas; Nasim Ullah; Ahmad Aziz Al-Ahmadi; Abdul Rehman Yasin; Ahmed Bilal Awan; Mohsin Jamil;doi: 10.3390/en15020667
Variable voltage and frequency are required to govern the torque-speed characteristics of many industrial drive systems. Traditionally, this is achieved with a power converting system implemented with multistage converters. This technology is based on rectifying AC power into DC and then DC into AC with an inverter circuit. The power quality concerns of both conversion stages are tackled by selecting high switching frequency PWM control and harmonics mitigation filters. Also, using a bulky DC-link capacitor is one of the big sources of low system reliability, so this approach increases the conversion losses, circuit, and control complications. The frequency step-down conversion is very attractive with direct AC-AC converters as it has a simple control and circuit structure, but these converters face poor power quality challenges once the output frequency is decreased with respect to an input. In these converters, the total harmonic distortion (THD) of the output voltage becomes very poor once the output frequency is reduced. The problem of high THD of the output is addressed in the power converting circuits implemented with line frequency multi-winding transformers. The required number of output winding and switching devices (diodes and thyristors) increases once the value of the output frequency is decreased. This will increase the overall volume, cost, and losses. The use of a bulky and costly line frequency transformer may be eliminated if AC voltage controllers have non-inverted and inverted voltage buck capabilities, such existing topologies either have complex control schemes or require a large number of operating devices. Therefore, in this research article, a new transformerless frequency step-down converter employing fewer devices is proposed. This approach is realized with a high-frequency controlled rectifier for the required voltage stabilization and a low-frequency inverter bridge for frequency control. Its validation is supported by the results attained from Simulink and practical-based prototypes.
Energies arrow_drop_down EnergiesOther literature type . 2022License: CC BYFull-Text: http://www.mdpi.com/1996-1073/15/2/667/pdfData sources: Multidisciplinary Digital Publishing Instituteadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.3390/en15020667&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess Routesgold 7 citations 7 popularity Top 10% influence Average impulse Top 10% Powered by BIP!
more_vert Energies arrow_drop_down EnergiesOther literature type . 2022License: CC BYFull-Text: http://www.mdpi.com/1996-1073/15/2/667/pdfData sources: Multidisciplinary Digital Publishing Instituteadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.3390/en15020667&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Other literature type 2022Publisher:MDPI AG Naveed Ashraf; Ghulam Abbas; Nasim Ullah; Ahmad Aziz Al-Ahmadi; Abdul Rehman Yasin; Ahmed Bilal Awan; Mohsin Jamil;doi: 10.3390/en15020667
Variable voltage and frequency are required to govern the torque-speed characteristics of many industrial drive systems. Traditionally, this is achieved with a power converting system implemented with multistage converters. This technology is based on rectifying AC power into DC and then DC into AC with an inverter circuit. The power quality concerns of both conversion stages are tackled by selecting high switching frequency PWM control and harmonics mitigation filters. Also, using a bulky DC-link capacitor is one of the big sources of low system reliability, so this approach increases the conversion losses, circuit, and control complications. The frequency step-down conversion is very attractive with direct AC-AC converters as it has a simple control and circuit structure, but these converters face poor power quality challenges once the output frequency is decreased with respect to an input. In these converters, the total harmonic distortion (THD) of the output voltage becomes very poor once the output frequency is reduced. The problem of high THD of the output is addressed in the power converting circuits implemented with line frequency multi-winding transformers. The required number of output winding and switching devices (diodes and thyristors) increases once the value of the output frequency is decreased. This will increase the overall volume, cost, and losses. The use of a bulky and costly line frequency transformer may be eliminated if AC voltage controllers have non-inverted and inverted voltage buck capabilities, such existing topologies either have complex control schemes or require a large number of operating devices. Therefore, in this research article, a new transformerless frequency step-down converter employing fewer devices is proposed. This approach is realized with a high-frequency controlled rectifier for the required voltage stabilization and a low-frequency inverter bridge for frequency control. Its validation is supported by the results attained from Simulink and practical-based prototypes.
Energies arrow_drop_down EnergiesOther literature type . 2022License: CC BYFull-Text: http://www.mdpi.com/1996-1073/15/2/667/pdfData sources: Multidisciplinary Digital Publishing Instituteadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.3390/en15020667&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess Routesgold 7 citations 7 popularity Top 10% influence Average impulse Top 10% Powered by BIP!
more_vert Energies arrow_drop_down EnergiesOther literature type . 2022License: CC BYFull-Text: http://www.mdpi.com/1996-1073/15/2/667/pdfData sources: Multidisciplinary Digital Publishing Instituteadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.3390/en15020667&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article 2025Publisher:MDPI AG Authors: Naveed Ashraf; Ghulam Abbas; Tanveer Yazdan;doi: 10.3390/en18071674
Voltage-controlled AC to DC converters govern the load voltage as per requirement. They may be employed in numerous applications, including battery-charging systems, light dimming, and industrial speed drive systems. The voltage regulation is based on the delay angle control of the thyristors, which has a simple gate control mechanism. Still, their input currents are highly distorted due to the generation of low-order harmonics. Also, their output voltage can only be regulated in step-down mode. The total harmonic distortion (THD) of the input current depends on the relative value of the fundamental frequency components to their non-fundamental component. The power factor (PF) also depends on these values, as well as the phase displacement angle, which is controlled by the firing delay. The improvement in THD and PF can be enhanced by maintaining the sinusoidal characteristics of the input current as much as possible. The use of an AC filter may enhance these characteristics, but filtering the low-order harmonics is a big challenge. This research suggests a novel control and circuit of a single-phase rectifier that may ensure the sinusoidal characteristics of the input current with a dual polarity-controlled output voltage. Thus, it improves the THD and PF for any polarity of the output DC voltage. A practical test circuit is built for the validation of the analytical and computer simulation results.
add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.3390/en18071674&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess Routesgold 1 citations 1 popularity Average influence Average impulse Average Powered by BIP!
more_vert add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.3390/en18071674&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article 2025Publisher:MDPI AG Authors: Naveed Ashraf; Ghulam Abbas; Tanveer Yazdan;doi: 10.3390/en18071674
Voltage-controlled AC to DC converters govern the load voltage as per requirement. They may be employed in numerous applications, including battery-charging systems, light dimming, and industrial speed drive systems. The voltage regulation is based on the delay angle control of the thyristors, which has a simple gate control mechanism. Still, their input currents are highly distorted due to the generation of low-order harmonics. Also, their output voltage can only be regulated in step-down mode. The total harmonic distortion (THD) of the input current depends on the relative value of the fundamental frequency components to their non-fundamental component. The power factor (PF) also depends on these values, as well as the phase displacement angle, which is controlled by the firing delay. The improvement in THD and PF can be enhanced by maintaining the sinusoidal characteristics of the input current as much as possible. The use of an AC filter may enhance these characteristics, but filtering the low-order harmonics is a big challenge. This research suggests a novel control and circuit of a single-phase rectifier that may ensure the sinusoidal characteristics of the input current with a dual polarity-controlled output voltage. Thus, it improves the THD and PF for any polarity of the output DC voltage. A practical test circuit is built for the validation of the analytical and computer simulation results.
add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.3390/en18071674&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess Routesgold 1 citations 1 popularity Average influence Average impulse Average Powered by BIP!
more_vert add ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.3390/en18071674&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Journal , Other literature type 2020Publisher:MDPI AG Faisal Tariq; Salem Alelyani; Ghulam Abbas; Ayman Qahmash; Mohammad Rashid Hussain;doi: 10.3390/en13236225
One of the most important concerns in the planning and operation of an electric power generation system is the effective scheduling of all power generation facilities to meet growing power demand. Economic load dispatch (ELD) is a phenomenon where an optimal combination of power generating units is selected in such a way as to minimize the total fuel cost while satisfying the load demand, subject to operational constraints. Different numerical and metaheuristic optimization techniques have gained prominent importance and are widely used to solve the nonlinear problem. Although metaheuristic techniques have a good convergence rate than numerical techniques, however, their implementation seems difficult in the presence of nonlinear and dynamic parameters. This work is devoted to solving the ELD problem with the integration of variable energy resources using a modified directional bat algorithm (dBA). Then the proposed technique is validated via different realistic test cases consisting of thermal and renewable energy sources (RESs). From simulation results, it is observed that dBA reduces the operational cost with less computational time and has better convergence characteristics than that of standard BA and other popular techniques like particle swarm optimization (PSO) and genetic algorithm (GA).
Energies arrow_drop_down EnergiesOther literature type . 2020License: CC BYFull-Text: http://www.mdpi.com/1996-1073/13/23/6225/pdfData sources: Multidisciplinary Digital Publishing Instituteadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.3390/en13236225&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess Routesgold 35 citations 35 popularity Top 10% influence Top 10% impulse Top 10% Powered by BIP!
more_vert Energies arrow_drop_down EnergiesOther literature type . 2020License: CC BYFull-Text: http://www.mdpi.com/1996-1073/13/23/6225/pdfData sources: Multidisciplinary Digital Publishing Instituteadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.3390/en13236225&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Journal , Other literature type 2020Publisher:MDPI AG Faisal Tariq; Salem Alelyani; Ghulam Abbas; Ayman Qahmash; Mohammad Rashid Hussain;doi: 10.3390/en13236225
One of the most important concerns in the planning and operation of an electric power generation system is the effective scheduling of all power generation facilities to meet growing power demand. Economic load dispatch (ELD) is a phenomenon where an optimal combination of power generating units is selected in such a way as to minimize the total fuel cost while satisfying the load demand, subject to operational constraints. Different numerical and metaheuristic optimization techniques have gained prominent importance and are widely used to solve the nonlinear problem. Although metaheuristic techniques have a good convergence rate than numerical techniques, however, their implementation seems difficult in the presence of nonlinear and dynamic parameters. This work is devoted to solving the ELD problem with the integration of variable energy resources using a modified directional bat algorithm (dBA). Then the proposed technique is validated via different realistic test cases consisting of thermal and renewable energy sources (RESs). From simulation results, it is observed that dBA reduces the operational cost with less computational time and has better convergence characteristics than that of standard BA and other popular techniques like particle swarm optimization (PSO) and genetic algorithm (GA).
Energies arrow_drop_down EnergiesOther literature type . 2020License: CC BYFull-Text: http://www.mdpi.com/1996-1073/13/23/6225/pdfData sources: Multidisciplinary Digital Publishing Instituteadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.3390/en13236225&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess Routesgold 35 citations 35 popularity Top 10% influence Top 10% impulse Top 10% Powered by BIP!
more_vert Energies arrow_drop_down EnergiesOther literature type . 2020License: CC BYFull-Text: http://www.mdpi.com/1996-1073/13/23/6225/pdfData sources: Multidisciplinary Digital Publishing Instituteadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.3390/en13236225&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Other literature type 2022Publisher:MDPI AG Naveed Ashraf; Ghulam Abbas; Nasim Ullah; Ahmad Aziz Al-Ahmadi; Alsharef Mohammad; Umar Farooq;doi: 10.3390/app12178582
Single-phase AC–AC converters with a direct power conversion approach are receiving rapid development as they have the ability to produce the regulated non-inverting and inverting form of the input voltage at the output. This feature enables them to correct the line voltage profile once they are used as dynamic voltage restorers if there is an issue of voltage sag or swell in the power distribution system. The regulated non-inverting and inverting form of the output voltage may also be used to obtain the step change in the output frequency, as it is required in many industrial drive systems. However, the realization of such existing circuits needs a large number of components and semiconductor devices, especially switching transistors. The operating control (on and off) of the transistors is directly associated with the use of gate control circuits. The count of such circuits is critical as their volume and cost are much greater than the operating transistors. The number of conducting semiconductor devices in the existing converters is also a big source of high conversion losses, thus leading to lower efficiency. This article introduces a new circuit topology realized only with the use of one full bridge of four IGBTs and a full bridge of four diodes. The use of four switching transistors only requires four gate control circuits that drastically reduce the overall volume and size. All the operating modes of the proposed topology require the conduction of fewer semiconductor devices, which helps to lower the conduction losses. Detailed analysis and description were carried out to validate the attractive features of the developed circuit once compared with the existing circuit topologies. For validation purposes, the computer simulation was carried out on Simulink software. The results obtained from this environment were compared with the real results gained from a practically developed laboratory test bench. The voltage regulation characteristics of the output voltage by employing pulse width modulation (PWM) were confirmed for two values of the non-inverting and inverting outputs.
Applied Sciences arrow_drop_down Applied SciencesOther literature type . 2022License: CC BYFull-Text: http://www.mdpi.com/2076-3417/12/17/8582/pdfData sources: Multidisciplinary Digital Publishing Instituteadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.3390/app12178582&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess Routesgold 2 citations 2 popularity Average influence Average impulse Average Powered by BIP!
more_vert Applied Sciences arrow_drop_down Applied SciencesOther literature type . 2022License: CC BYFull-Text: http://www.mdpi.com/2076-3417/12/17/8582/pdfData sources: Multidisciplinary Digital Publishing Instituteadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.3390/app12178582&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Other literature type 2022Publisher:MDPI AG Naveed Ashraf; Ghulam Abbas; Nasim Ullah; Ahmad Aziz Al-Ahmadi; Alsharef Mohammad; Umar Farooq;doi: 10.3390/app12178582
Single-phase AC–AC converters with a direct power conversion approach are receiving rapid development as they have the ability to produce the regulated non-inverting and inverting form of the input voltage at the output. This feature enables them to correct the line voltage profile once they are used as dynamic voltage restorers if there is an issue of voltage sag or swell in the power distribution system. The regulated non-inverting and inverting form of the output voltage may also be used to obtain the step change in the output frequency, as it is required in many industrial drive systems. However, the realization of such existing circuits needs a large number of components and semiconductor devices, especially switching transistors. The operating control (on and off) of the transistors is directly associated with the use of gate control circuits. The count of such circuits is critical as their volume and cost are much greater than the operating transistors. The number of conducting semiconductor devices in the existing converters is also a big source of high conversion losses, thus leading to lower efficiency. This article introduces a new circuit topology realized only with the use of one full bridge of four IGBTs and a full bridge of four diodes. The use of four switching transistors only requires four gate control circuits that drastically reduce the overall volume and size. All the operating modes of the proposed topology require the conduction of fewer semiconductor devices, which helps to lower the conduction losses. Detailed analysis and description were carried out to validate the attractive features of the developed circuit once compared with the existing circuit topologies. For validation purposes, the computer simulation was carried out on Simulink software. The results obtained from this environment were compared with the real results gained from a practically developed laboratory test bench. The voltage regulation characteristics of the output voltage by employing pulse width modulation (PWM) were confirmed for two values of the non-inverting and inverting outputs.
Applied Sciences arrow_drop_down Applied SciencesOther literature type . 2022License: CC BYFull-Text: http://www.mdpi.com/2076-3417/12/17/8582/pdfData sources: Multidisciplinary Digital Publishing Instituteadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.3390/app12178582&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess Routesgold 2 citations 2 popularity Average influence Average impulse Average Powered by BIP!
more_vert Applied Sciences arrow_drop_down Applied SciencesOther literature type . 2022License: CC BYFull-Text: http://www.mdpi.com/2076-3417/12/17/8582/pdfData sources: Multidisciplinary Digital Publishing Instituteadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.3390/app12178582&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Other literature type 2021Publisher:MDPI AG Saqib Khalid; Ali Raza; Umar Alqasemi; Nebras Sobahi; Muhammad Zain Yousaf; Ghulam Abbas; Mohsin Jamil;doi: 10.3390/en14238148
One of the technical challenges that needs to be addressed for the future of the multi-terminal high voltage direct current (M-HVDC) grid is DC fault isolation. In this regard, HVDC circuit breakers (DCCBs), particularly hybrid circuit breakers (H-DCCBs), are paramount. The H-DCCB, proposed by the ABB, has the potential to ensure a reliable and safer grid operation, mainly due to its millisecond-level current interruption capability and lower on-state losses as compared to electromechanical and solid-state based DCCBs. This paper aims to study and evaluate the operational parameters, e.g., electrical, and thermal stresses on the IGBT valves and energy absorbed by the surge arrestors within H-DCCB during different DC fault scenarios. A comprehensive set of modeling requirements matching with operational conditions are developed. A meshed four-terminal HVDC test bench consisting of twelve H-DCCBs is designed in PSCAD/EMTDC to study the impacts of the M-HVDC grid on the operational parameters of H-DCCB. Thus, the system under study is tested for different current interruption scenarios under a (i) low impedance fault current and (ii) high impedance fault current. Both grid-level and self-level protection strategies are implemented for each type of DC fault.
Energies arrow_drop_down EnergiesOther literature type . 2021License: CC BYFull-Text: http://www.mdpi.com/1996-1073/14/23/8148/pdfData sources: Multidisciplinary Digital Publishing Instituteadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.3390/en14238148&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess Routesgold 16 citations 16 popularity Top 10% influence Top 10% impulse Top 10% Powered by BIP!
more_vert Energies arrow_drop_down EnergiesOther literature type . 2021License: CC BYFull-Text: http://www.mdpi.com/1996-1073/14/23/8148/pdfData sources: Multidisciplinary Digital Publishing Instituteadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.3390/en14238148&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Other literature type 2021Publisher:MDPI AG Saqib Khalid; Ali Raza; Umar Alqasemi; Nebras Sobahi; Muhammad Zain Yousaf; Ghulam Abbas; Mohsin Jamil;doi: 10.3390/en14238148
One of the technical challenges that needs to be addressed for the future of the multi-terminal high voltage direct current (M-HVDC) grid is DC fault isolation. In this regard, HVDC circuit breakers (DCCBs), particularly hybrid circuit breakers (H-DCCBs), are paramount. The H-DCCB, proposed by the ABB, has the potential to ensure a reliable and safer grid operation, mainly due to its millisecond-level current interruption capability and lower on-state losses as compared to electromechanical and solid-state based DCCBs. This paper aims to study and evaluate the operational parameters, e.g., electrical, and thermal stresses on the IGBT valves and energy absorbed by the surge arrestors within H-DCCB during different DC fault scenarios. A comprehensive set of modeling requirements matching with operational conditions are developed. A meshed four-terminal HVDC test bench consisting of twelve H-DCCBs is designed in PSCAD/EMTDC to study the impacts of the M-HVDC grid on the operational parameters of H-DCCB. Thus, the system under study is tested for different current interruption scenarios under a (i) low impedance fault current and (ii) high impedance fault current. Both grid-level and self-level protection strategies are implemented for each type of DC fault.
Energies arrow_drop_down EnergiesOther literature type . 2021License: CC BYFull-Text: http://www.mdpi.com/1996-1073/14/23/8148/pdfData sources: Multidisciplinary Digital Publishing Instituteadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.3390/en14238148&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess Routesgold 16 citations 16 popularity Top 10% influence Top 10% impulse Top 10% Powered by BIP!
more_vert Energies arrow_drop_down EnergiesOther literature type . 2021License: CC BYFull-Text: http://www.mdpi.com/1996-1073/14/23/8148/pdfData sources: Multidisciplinary Digital Publishing Instituteadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.3390/en14238148&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Conference object , Article 2017Publisher:IEEE Authors: Ghulam Abbas; Hafiz M. Ashraf; Saif Ur Rehman; Usman Ali;The importance of Conventional Current Transformer (CCT) for the monitoring and protection in power systems is not ignorable. Although there has been an extensive use of CCT for a long time but a lot of problems and issues such as inrush current, saturation, current transformer ratios, etc. faced by CCT make its use quite limited. Issues arising in CCTs have pulled the attraction of researchers and protection engineers towards a new instrument technology based on Opto-Electromagnetics. An Optical Current Transformer (OCT) model based on the simulation has been proposed here which follows the Faraday's law of Electromagnetics. The use of OCT will resolve almost all issues that were being faced by CCTs. So this new designed model of OCT can replace easily the CCTs for both the protection and metering purposes. This simulation model of OCT using operational amplifiers is being proposed here just to motivate the protection and design engineers especially in Pakistan to adopt the new technology of OCT for the measurement of current in place of CCT. In addition to resolving all issues related to CCT, OCT will also make the power quality better. Three types of outputs can be obtained from an OCT which are: low energy analog output (LEA), high energy analog output (HEA) and digital output. Due to sampling rate limitations involved, a digital output is hard to use to avail the wider bandwidth option. To use all the benefits of an OCT, a low energy output signal will be used here for the simulation requirement here. After the required OCT model development, simulation results will be included to prove that CCT can be replaced by the OCT.
https://doi.org/10.1... arrow_drop_down https://doi.org/10.1109/icee.2...Conference object . 2017 . Peer-reviewedLicense: STM Policy #29Data sources: Crossrefadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1109/icee.2017.7893440&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eu4 citations 4 popularity Top 10% influence Average impulse Average Powered by BIP!
more_vert https://doi.org/10.1... arrow_drop_down https://doi.org/10.1109/icee.2...Conference object . 2017 . Peer-reviewedLicense: STM Policy #29Data sources: Crossrefadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1109/icee.2017.7893440&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Conference object , Article 2017Publisher:IEEE Authors: Ghulam Abbas; Hafiz M. Ashraf; Saif Ur Rehman; Usman Ali;The importance of Conventional Current Transformer (CCT) for the monitoring and protection in power systems is not ignorable. Although there has been an extensive use of CCT for a long time but a lot of problems and issues such as inrush current, saturation, current transformer ratios, etc. faced by CCT make its use quite limited. Issues arising in CCTs have pulled the attraction of researchers and protection engineers towards a new instrument technology based on Opto-Electromagnetics. An Optical Current Transformer (OCT) model based on the simulation has been proposed here which follows the Faraday's law of Electromagnetics. The use of OCT will resolve almost all issues that were being faced by CCTs. So this new designed model of OCT can replace easily the CCTs for both the protection and metering purposes. This simulation model of OCT using operational amplifiers is being proposed here just to motivate the protection and design engineers especially in Pakistan to adopt the new technology of OCT for the measurement of current in place of CCT. In addition to resolving all issues related to CCT, OCT will also make the power quality better. Three types of outputs can be obtained from an OCT which are: low energy analog output (LEA), high energy analog output (HEA) and digital output. Due to sampling rate limitations involved, a digital output is hard to use to avail the wider bandwidth option. To use all the benefits of an OCT, a low energy output signal will be used here for the simulation requirement here. After the required OCT model development, simulation results will be included to prove that CCT can be replaced by the OCT.
https://doi.org/10.1... arrow_drop_down https://doi.org/10.1109/icee.2...Conference object . 2017 . Peer-reviewedLicense: STM Policy #29Data sources: Crossrefadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1109/icee.2017.7893440&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eu4 citations 4 popularity Top 10% influence Average impulse Average Powered by BIP!
more_vert https://doi.org/10.1... arrow_drop_down https://doi.org/10.1109/icee.2...Conference object . 2017 . Peer-reviewedLicense: STM Policy #29Data sources: Crossrefadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://beta.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1109/icee.2017.7893440&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eu