• Energy Research

AbstractThis research paper deals the practical performance analysis of Permanent Magnet Synchronous Motor (PMSM) drives‐based photovoltaic (PV) pumping applications. A modified firefly algorithm (MFA) based maximum power point tracker (MPPT) with Luo converter is employed. In this research work, equated to classical Firefly algorithm, the degree of attractiveness (α) has been updated in each iteration number with rejection of coefficients of absorption (β) as well as random movement factor (γ) to achieve faster PV tracked efficiency with rapid convergence velocity. Vector‐oriented inverter control strategy depending on solar irradiance has been used for controlling the rate of converter/water flow. The proposed standalone PV pumping system has been tested under highly weather fluctuating conditions which provide efficient, accurate and feasible option for water pumping in remote areas. Experimental results have been justified using dSPACE (DS1104) practical environment.

In this paper Multistage Switched Inductor Boost Converter (Multistage SIBC) is uttered for renewable energy applications. The projected converter is derived from an amalgamation of the conventional step-up converter and inductor stack. The number of inductor and duty ratio decides the overall voltage gain of the projected converter. The projected converter consists of only one controlled power semiconductor device. The 50 KHz frequency is adopted to reduce the L, C value and to suppress the output waveform ripples. The analysis and working of projected converter is discussed in detail. Simulation of the projected converter for three stages is done in Matlab/Simulink (version-2016) and the results are verified with theoretical values.

The proposed exertion represents the modified high voltage conversion Cuk converter for renewable energy application. The proposed Cuk converter is a combination of the conventional boost converter and Cuk converter. The arrangement of the proposed converter make, such as, it becomes the single controlled device DC-DC topology. The voltage conversion ratio of proposed converter has increased by ten times of the conventional Cuk converterat a duty ratio of 90%. The detailed analysis of the voltage conversion ratio and losses occur due to internal resistance of components is done in the paper. The current conversion ratio of proposed converter is discussed in the paper. The proposed converter is simulated in MatLab Simulink (2014) for 100W and regulated 10V input DC supply. The simulation results represent the existence and working of the proposed converter.

A new non‐isolated high‐voltage gain single switch quadratic modified single‐ended primary‐inductor capacitor (SEPIC) DC–DC converter is proposed in this study. The proposed converter consists of a modified SEPIC converter along with a boosting module to obtain a high‐voltage gain at a low‐duty ratio. It has all advantages of the SEPIC converter such as continuous input current, which makes it applicable for renewable energy sources such as photovoltaic systems. The proposed converter is able to attain a higher voltage gain in comparison with similar previous transformer‐less DC–DC converters. Also, unlike high‐voltage transformer‐based DC–DC converters, it does not suffer from leakage inductances. Also, the proposed converter presents low‐voltage stress across the switch and output diode. The proposed converter is controlled through a single switch and there is no limitation for a range of duty ratios. The voltage gain analysis of the proposed converter is done in continuous conduction mode and discontinuous conduction mode, also comparative analysis is done with the existing topologies with similar features. The proposed converter is designed for 400 V DC microgrid applications. The theoretical analysis of the proposed converter is verified by the experimental investigation in the laboratory.

The paper proposes a dual output DC-DC converter for electric vehicle battery charging application from the PV source. The proposed converter is derived from modified SEPIC Converter (converter-A) and multilevel boost converter (converter-B) in such way that both converter share common input source as PV. Generally, the voltage of PV is low and series and parallel combination of PV module is not a practicable solution to accomplish high voltage demand of electric vehicle charging station. Therefore, the high gain DC-DC plays a vital in PV integrated electric vehicle charging station from low to high voltage conversion. However, with dual output capability and single switch controlled structure make the proposed converter a superior choice for PV integrated EV charging station. In addition, the same or different rated output can be achieved with proper selection of duty ratio. The working principle with characteristics waveform and mathematical analysis of voltage gain are discussed in detail. The proposed converter is simulated in MatLab 2018a and obtained simulation result proves the mathematical analysis and functionality of the converter.

The projected 2L-Y DC-DC Converter topologies are new members of the XY converter family. The 2L-Y converter is a combination of two single stage converters consisting, one is 2L converter and another is Y converter. Based on the configuration of Y converter four new topologies called a 2L-LVD converter, 2L-2LVD converter, 2L-2LCVD converter and 2L-2LCmVD converter are derived, discussed and analyzed in this paper. Due to higher conversion ratio capability of the proposed 2L-Y converter, it provides a workable solution for photovoltaic and electrical drive applications. The striking features of 2L-Y converter topologies are only one controlled device, negative output, Transformer-less topology, compact structure and having a minimum internal resistance. The proposed 2L-Y converters are simulated into MATLAB and simulation results are confirmed the theoretical analysis.

The paper proposes a new structure of SEPIC with high voltage gain for renewable energy applications. The proposed circuit is designed by amalgamating the conventional SEPIC with a boosting module. Therefore, the converter benefits from various advantages that the SEPIC converter has, such as continuous input current. Also, high voltage gain and input current continuity make the presented converter suitable for renewable energy sources. The modified SEPIC converter (MSC) provides higher voltage gain compared to the conventional SEPIC and recently addressed converters with a single-controlled switch. The analysis of voltage gain in continuous current mode (CCM) and discontinuous current mode (DCM) is analyzed by considering the non-idealities of the semiconductor devices and passive components. The selection of the semiconductor devices depending on the voltage-current rating is presented along with the designing of reactive components. The numerical simulation and experimental work are carried out, and the obtained results prove the feasibility of the MSC concept and the theoretical analysis.

Solar energy is one of the most important renewable sources due to its advantages such as simple structure, convenient installation, diverse applications, and low maintenance costs. Low power generation is the main concern with solar panels, so the maximum transmission of this power is a prime priority. The design of boost converters with the ability to generate high voltage gain, efficient structure, and stable and low-cost control circuits is the first step after installing these panels. This study presents a simple and high-gain design of a step-up converter, which uses only one power switch. The significance of this issue is when it will be apparent to know that each switch needs a separate control circuit and complex systems require more control topologies. In comparison with the conventional converter, the gain of the proposed converter, with the use of two additional diodes, a capacitor, and an inductor, was five times greater than the gain of a classical converter with 80% of the duty cycle. The proposed converter can solve the narrow turn-off period problem for the power semiconductor components in order to achieve higher DC voltages that are possible at higher duty cycles in classical converters. Small signal analysis of the proposed converter is presented and a controller based on steady-space matrixes is presented. The reaction of the proposed controller is considerable since a deep mathematical analysis supports this controller. The principal operations of the proposed converter and the projected controller were analyzed mathematically and verified with the help of MATLAB/SIMULINK. Additionally, hardware implementation of the proposed converter was done on a laboratory-scale around 100 W.