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The objective of this paper is to analyze and quantify the inertia and frequency responses of wind power plants with different wind turbine technologies (particularly those of fixed speed, variable slip with rotor-resistance controls, and variable speed with vector controls).

The Country Opinion Survey in Swaziland assists the World Bank Group (WBG) in gaining a better understanding of how stakeholders in Swaziland perceive the WBG. It provides the WBG with systematic feedback from national and local governments, multilateral/bilateral agencies, media, academia, the private sector, and civil society in Swaziland on 1) their views regarding the general environment in Swaziland; 2) their overall attitudes toward the WBG in Swaziland; 3) overall impressions of the WBG’s effectiveness and results, knowledge work and activities, and communication and information sharing in Swaziland; and 4) their perceptions of the WBG’s future role in Swaziland.

Green ammonia is gaining momentum as a globally significant technology for deep decarbonisation. In this thesis, several models are developed across chemical, techno-economic, and energy system modelling disciplines to explore the future role of green ammonia. First, standalone models of production (i.e., power-to-ammonia) and re-electrification (i.e., ammonia-to-power) are developed and compared to competing technologies. Second, these models are integrated into a planning and dispatch energy system model (ESM) of India to 2050. The ESM has several novel additions including the sector coupling of hydrogen and ammonia, multiple years of granular weather data, and learning-curve-based technology cost forecasts. India is chosen as an ideal case study given its globally unmatched demand growth in all three relevant sectors: electricity, green hydrogen, and green ammonia. The projected electricity demands for green hydrogen and ammonia production account for 25% of the total Indian electricity demand in 2050, underscoring the transformational potential that green hydrogen and ammonia sector coupling can have on the Indian energy system. The results of the state-of-the-art ESM highlight synergistic effects of hydrogen and ammonia sector coupling with the power system. The least-cost system employs seasonal green ammonia production paired with up to 40 million tonnes (i.e., 200 TWh) of ammonia storage, as well as some re-electrification via gas turbines. Sector coupling reduces system curtailment, addresses challenges of long-duration storage, and improves system resilience to interannual weather variations. While India is a crucial case study from a global decarbonisation perspective, the methodology and findings are generally applicable, and it is the aim of this work to motivate and accelerate the wider research community into considering the potential impacts of green ammonia sector coupling on electricity grid design. Finally, this work highlights strategic technology development direction for ammonia producers and gas turbine manufacturers, as well as implications for policymakers.

A five-foot-diameter, spherical, thin-walled, steel shell, simulating a nuclear reactor outer containment vessel, was lined with three different shock absorbing materials and subjected to internal blast loading from Pentolite explosive charges. Strain-time histories of shell response were measured with strain gages on the shell's outer surface. Peak strains generated in the lined shells were approximately one-half those recorded with the same shell when unlined. The results suggest the feasibility of increasing the blast resistance of outer containment vessels of nuclear reactors through the use of a suitable lining material. (Author). ; Department of the Army project no. 503-04-002. ; "April 1961" ; BRL-1341 ; A five-foot-diameter, spherical, thin-walled, steel shell, simulating a nuclear reactor outer containment vessel, was lined with three different shock absorbing materials and subjected to internal blast loading from Pentolite explosive charges. Strain-time histories of shell response were measured with strain gages on the shell's outer surface. Peak strains generated in the lined shells were approximately one-half those recorded with the same shell when unlined. The results suggest the feasibility of increasing the blast resistance of outer containment vessels of nuclear reactors through the use of a suitable lining material. (Author). ; Mode of access: Internet.

Item 434-A-10 ; "FEA/D-75/629." ; Prepared by Jim Rathwell and Gwendolyn Gales. ; Mode of access: Internet.

Haiti has long faced severe natural and human-created hazards due to its location in the Caribbean hurricane zone and to widespread deforestation. Hazards including storms, floods, and droughts have highly destructive impacts on buildings, land, water, livestock, and people in Haiti. The poorest Haitians, including low-income women, children, and elderly people, are especially vulnerable. The prospects for building Haiti's resilience to climate change are closely tied to post-earthquake reconstruction. As Haiti prepares for more disasters and rebuilds significant parts of its infrastructure, there is a real opportunity to integrate climate resilience into these efforts. This report analyses Haiti's adaptive capacity, adaptation options, and finance and governance issues. It makes recommendations on resilience building and identifies climate-change adaptation needs and opportunities. ; Haïti a subi plusieurs importantes catastrophes naturelles et provoquées ces dernières années, du fait de sa localisation dans la zone cyclonique des Caraïbes et d’un déboisement accéléré. Ces catastrophes (tempêtes, inondations, sécheresses) ont des effets dévastateurs sur les personnes, les constructions, les terres, l’eau et le bétail en Haïti. Les Haïtiens les plus pauvres, dont les femmes, les enfants et les personnes âgées, sont particulièrement vulnérables. Les perspectives pour l’adaptation au changement climatique en Haïti sont aujourd’hui intimement liées aux projets de reconstruction post-séisme. Le pays étant désormais soucieux d’investir dans la préparation aux catastrophes et la reconstruction de ses infrastructures, il est essentiel de saisir cette occasion pour intégrer l’adaptation au changement climatique aux efforts de reconstruction. Ce rapport analyse la capacité d’adaptation d’Haïti, les options d’adaptation et les problèmes de financement et de gouvernance. Il présente des recommandations relatives à la construction de la résilience et identifie des besoins et des opportunités d’adaptation face au changement ...

In the series University of Florida Digital Collections. ; Includes vita. ; (Bibliography) Includes bibliographical references. ; (Source of Description) Description based on online resource; title from PDF title page. ; (Source of Description) This bibliographic record is available under the Creative Commons CC0 public domain dedication. The University of Florida Libraries, as creator of this bibliographic record, has waived all rights to it worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law. ; (Statement of Responsibility) by Douglas Renk. ; (Thesis) Thesis (M.S.)--University of Florida, 2009. ; (Local) Adviser: Pullammanappallil, Pratap C.

text ; This dissertation examines the application of various classical root finding methods to digital maximum power point tracking (DMPPT). An overview of root finding methods such as the Newton Raphson Method (NRM), Secant Method (SM), Bisection Method (BSM), Regula Falsi Method (RFM) and a proposed Modified Regula Falsi Method (MRFM) applied to photovoltaic (PV) applications is presented. These methods are compared among themselves. Some of their features are also compared with other commonly used maximum power point (MPP) tracking methods. Issues found when implementing these root finding methods based on continuous variables in a digital domain are explored. Some of these discussed issues include numerical stability, digital implementation of differential operators, and quantization error. Convergence speed is also explored. The analysis is used to provide practical insights into the design of a DMPPT based on classical root finding algorithms. A new DMPPT based on a MRFM is proposed and used as the basis for the discussion. It is shown that this proposed method is faster than the other discussed methods that ensure convergence to the MPP. The discussion is approached from a practical perspective and also includes theoretical analysis to support the observations. Extensive simulation and experimental results with hardware prototypes verify the analysis. ; Electrical and Computer Engineering

The objective of the study is to: (i) assess the adequacy of the existing heat and electricity tariff levels for achieving financial viability of the energy sector operators; (ii) analyze the distributional implications of energy tariff increases; and (iii) assess the effectiveness of the existing social assistance programs and how to adjust them to mitigate the impact of energy tariff increase on the poor This report presents the key findings and recommendations for the Government of Moldova as well as other energy sector stakeholders. The report starts with a synopsis that summarizes the key findings and recommendations. The main report section starts with an introduction to country context, presents the design of tariff setting methodologies, and assesses the adequacy of tariffs based on constructed scenarios. Thereafter analysis of the distributional impact of projected range of tariff increases and the need to adjust the social assistance programs to mitigate the impact on the poor are presented. The report concludes with recommendations for the government on actions to be implemented on tariff setting methodologies and social assistance as well as areas for further research. Appendices include further background information of the analysis.