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Analysis and NN-based control of doubly fed induction generator in wind power generation

Soares, Orlando; Gonçalves, Henrique; Martins, António; Carvalho, Adriano
Fonte: Renewable Energy & Power Quality Journal Publicador: Renewable Energy & Power Quality Journal
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
46.11%
With the increasing size of wind power generation it is required to perform power system stability analysis that uses dynamic wind generator models. In this paper are presented all the wind power system components, including the turbine, the generator, the power electronic converter and controllers. The aim is to study the Doubly Fed Induction Generator (DFIG) operation and its connection to the power system, either during normal operation or during transient grid fault events. Two different control system design technologies are present, the first is performed by standard PI controllers and the second is based on artificial neural networks

Water-power at Niagara Falls to be successfully utilized : its objects, facilities and resources, inducements for manufacturers, etc. /

Niagara River Hydraulic Tunnel, Power and Sewer Co.
Fonte: Buffalo : Matthews, Northrup, Publicador: Buffalo : Matthews, Northrup,
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
45.98%
The lithograph, "General view of lands, tunnel and docks of Niagara River Hydraulic Tunnel, Power and Sewer Company," called for p. [4] in the Index, has been removed and encapsulated, and is shelved separately.

Canadian Niagara Power League Meeting (1897)

Canadian Niagara Power League. Meeting (1897 : Niagara Falls, Ont.); Rakine, William Birch
Fonte: Brock University Publicador: Brock University
Tipo: Livro
EN
Relevância na Pesquisa
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Remarks of Mr. William B. Rankine, secretary of the Canadian Niagara Power Company.

Investigation and Research of China Power Social Universal Services

North China Electric Power University
Fonte: World Bank, Washington, DC Publicador: World Bank, Washington, DC
Relevância na Pesquisa
46.24%
The investigation conducted by this project concernt China power social universal services include: the investigation on the actuality of the domestic power social universal services or on the other industries and the research and study on abroad services. Through research of the domestic power social universal service, we could realize the actuality of the domestic power social universal services, hold the scale of the requirement, the characteristics of the region, and also the existing problems and obstacles of the universal service, furthermore, calculate the amount of capital that power social universal services needed; then draw the successful experience of domestic and foreign services to make suggestions on the policy, regulatory measures and implementation of programs which are adapt to the development of China power social universal service.

Private Sector, Small Scale, Grid-connected Renewable Power Generation in Sri Lanka : A Review of the Experience of the Past Decade 1996 to 2006

World Bank
Fonte: Washington, DC Publicador: Washington, DC
EN_US
Relevância na Pesquisa
36.24%
The objective of this report, therefore, is to provide a comprehensive analysis of the development of the renewable power generation sector in the country over a period of ten years, from 1996 to 2006, as a reference for the design of future policy and market interventions in Sri Lanka and other countries. This analysis aims to assist stakeholders to assess the potential for growth in terms of energy contribution from indigenous renewable resources, private sector investment and rural infrastructure development. The report also serves to reveal the conflicting priorities of stakeholders, which impact the development of indigenous energy resources, and thereby create a platform for constructive debate towards realizing a sustainable and optimal outcome for the country.

International Experience with Cross-border Power Trading

World Bank
Fonte: Washington, DC Publicador: Washington, DC
EN_US
Relevância na Pesquisa
36.24%
The five main lessons for Southern Africa from our review of the experiencewith cross-border power trading in other regions of the work are that: Security of supply concerns need to be explicitly addressed and understood by the parties to proposed cross-border transactions. Regional entities need to be empowered to make decisions based on legally enforceable national government commitments, particularly in relation to planning, pricing, and settlement rules. Bilateral trading provides a basis for expanding trading volumes, both through constructing the physical infrastructure that future deals will use and by establishing workable legal and regulatory frameworks. Power pools will help to generate sustained increases in cross-border trading along with other regional trading arrangements, particularly in power systems with several interconnection. The substance and process of regulatory reviews in importing and exporting countries must be clear to create sufficient investment certainty.

Revisiting Policy Options on the Market Structure in the Power Sector

World Bank
Fonte: Washington, DC Publicador: Washington, DC
EN_US
Relevância na Pesquisa
36.24%
The objectives of this study are to develop a taxonomy of the existing power market structures, as shown by the extent of vertical and horizontal unbundling found among restructured power systems, across developing countries; to design an analytical framework for assessing the desirability of unbundling under the variety of economic conditions found among developing countries; and To propose insights for operational guidance on alternative market structures based on relevant criteria, in particular on the initial conditions of a country and its power sector. The study specifically examines whether power system size and country per capita income can be reliable indicators of initial conditions for guiding policy on power market structure. This guidance is needed to address issues such as whether there are solid foundations for recommending vertical unbundling for small power systems in low-income countries, particularly in the absence of short term privatization prospects. The policy recommendations therefore have to be tailored to the specific taxonomy of market structures that characterize the electricity sector in developing countries. The study reports the evidence from econometric analysis and case studies on the (relative) success of achieving the objectives of unbundling. These objectives may be to enhance transparency and governance...

Development of a Regional Power Market in the Greater Mekong Sub-Region : Compatibility of Regulatory Systems and Pricing Principles

Vernstrom, Robert
Fonte: World Bank, Washington, DC Publicador: World Bank, Washington, DC
EN_US
Relevância na Pesquisa
36.24%
A 1999 study by the Bank, which summarized the unprecedented opportunity for economic, and environmental benefits for individual countries, and the entire Greater Mekong Sub-region (GMS) associated with cross-border power trade, concluded that a full trade scenario, could yield significant savings over the next two decades, even before quantifying substantial environmental benefits. Based on these conclusions, GMS member countries were surveyed (attached as an appendix), and, this report compares the status of institutional/regulatory, and commercial policies across the region, to provide background information. Specifically, the focus is on the compatibility of national regulatory systems, especially for wheeling; the compatibility of pricing principles at both production, and transmission; and, the potential barriers to enhanced trade, which are revealed in this review. Section 2 provides a brief review of on-going reforms in member countries. Section 3 compares progress with respect to key regulatory, and commercial issues (particularly pricing) most critical to power trade...

The Potential of Regional Power Sector Integration : South African Power Pool Transmission and Trading Case Study

Economic Consulting Associates
Fonte: World Bank, Washington, DC Publicador: World Bank, Washington, DC
EN_US
Relevância na Pesquisa
36.25%
Developing countries are increasingly pursuing and benefitting from regional power system integration (RPSI) as an important strategy to help provide reliable, affordable electricity to their economies and citizens. Increased electricity cooperation and trade between countries can enhance energy security, bring economies-of-scale in investments, facilitate financing, enable greater renewable energy penetration, and allow synergistic sharing of complementary resources. This briefing note draws from the experiences of RPSI schemes around the world to present a set of findings to help address these challenges. It is based on case studies of 12 RPSI projects and how they are dealing with key aspects of RPSI, such as: (i) finding the right level of integration; (ii) optimizing investment on a regional basis; (iii) appropriate regional institutions (iv) technical and regulatory harmonization; (v) power sector reform and integration (vi) the role of donor agencies (vii) reducing emissions through RPSI; and (viii) RPSI and renewable energy.

The Potential of Regional Power Sector Integration : Greater Mekong Subregion Transmission and Trading Case Study

Economic Consulting Associates
Fonte: World Bank, Washington, DC Publicador: World Bank, Washington, DC
EN_US
Relevância na Pesquisa
36.24%
Developing countries are increasingly pursuing and benefitting from regional power system integration (RPSI) as an important strategy to help provide reliable, affordable electricity to their economies and citizens. Increased electricity cooperation and trade between countries can enhance energy security, bring economies-of-scale in investments, facilitate financing, enable greater renewable energy penetration, and allow synergistic sharing of complementary resources. This briefing note draws from the experiences of RPSI schemes around the world to present a set of findings to help address these challenges. It is based on case studies of 12 RPSI projects and how they are dealing with key aspects of RPSI, such as: (i) finding the right level of integration; (ii) optimizing investment on a regional basis; (iii) appropriate regional institutions (iv) technical and regulatory harmonization; (v) power sector reform and integration (vi) the role of donor agencies (vii) reducing emissions through RPSI; and (viii) RPSI and renewable energy.

India Power Sector Diagnostic Review : More Power to India - The Challenge of Distribution

World Bank
Fonte: Washington, DC Publicador: Washington, DC
EN_US
Relevância na Pesquisa
36.24%
This report reviews the evolution of the Indian power sector since the landmark Electricity Act of 2003 (EA 2003, or EA), with a focus on distribution as key to performance and viability of the sector. While all three segments of the power sector generation, transmission, and distribution are important, revenues originate with the customer at distribution, so subpar performance there hurts the entire value chain. Persistent operational and financial shortcomings in distribution have repeatedly led to central bailouts for the whole sector, even though power is a concurrent 1 subject under the Indian constitution and distribution is almost entirely under state control. Ominously, the recent sharp increase in private investment and market borrowing means power sector difficulties are more likely to spill over to lenders and affect the broader financial sector. Government-initiated reform efforts first focused on the generation and transmission segments, reflecting the urgent need for adding capacity and the complexity of issues to be addressed at the consumer interface. Consequently...

Private Participation in the Indian Power Sector : Lessons from Two Decades of Experience

Mukherjee, Mohua
Fonte: Washington, DC: World Bank Publicador: Washington, DC: World Bank
EN_US
Relevância na Pesquisa
36.24%
This book reviews the major developments in and the lessons learned from the 21-year (1991-2012) experience with private sector participation (PSP) in the power sector in India. It discusses the political economy context of the policy changes, looks at reform initiatives that were implemented for the generation sector, describes transmission and distribution segments at different points in the evolution of the sector, and concludes with a summary of lessons learned and a suggested way forward. The evolution of private participation in the Indian power sector can be divided into different phases. Phase one was launched with the opening of the generation sector to private investment in 1991. Phase two soon followed - early experiments with state-level unbundling and other reform initiatives, including regulatory reform, culminating in divestiture, and privatization in Orissa and Delhi respectively. Phase three, the passage of the electricity act of 2003 by the central government, followed by a large increase in private entry into generation and forays into transmission and experiments with distribution franchise models in urban and rural areas during the 11th five-year plan (2007-12) period. In phase four...

Power inverter for photovoltaic plant and expertise in power control for wind generators

Arnaltes Gómez, Santiago
Fonte: Universidade Carlos III de Madrid Publicador: Universidade Carlos III de Madrid
Tipo: Relatório Formato: application/pdf
Publicado em 14/04/2008 ENG; ENG
Relevância na Pesquisa
46.09%
The Power System Control Group of a Madrid based university has developed a technology that allows the control of power inverters for photovoltaic plants grid connection. The research group has a great deal of experience in R&D projects dealing with the modelling and control of electrical machines, mainly for wind energy and photovoltaic applications, and renewable energy grid integration. They are seeking companies in these energy sectors, for a technical cooperation

Research and innovation in power electronics systems applied to energy management

Barrado Bautista, Andrés
Fonte: Universidade Carlos III de Madrid Publicador: Universidade Carlos III de Madrid
Tipo: Relatório Formato: application/pdf
Publicado em 15/04/2008 ENG
Relevância na Pesquisa
46.03%
The Power Electronics Systems Group (GSEP) at University Carlos III de Madrid (Spain) offers its wide experience and background in consultancy, R&D projects with private and public funding and pre-industrial prototype building in four main topics: energy conversion (design, modelling and prototyping of equipments and systems), magnetic components modelling and design, photovoltaic systems and electromagnetic compatibility (EMC).

Study of the current performance of the European power transformer fleet

Ortiz Fernández, Alfredo; Fernández Diego, Cristina; Olmo Salas, Cristian; Carcedo Haya, Juan; Renedo Estébanez, Carlos Javier; Delgado San Román, Fernando
Fonte: European Association for the Development of Renewable Energies, Environment and Power Quality (EA4EPQ) Publicador: European Association for the Development of Renewable Energies, Environment and Power Quality (EA4EPQ)
Tipo: info:eu-repo/semantics/article; publishedVersion
ENG
Relevância na Pesquisa
46.03%
In many countries, diverse legislations are today asking for more rational use of energy. For this reason, several initiatives are nowadays promoting a reduction of the overall energy consumption. The European Union has published a Directive 2009/125/EC which fix eco-design requirements to energy-related products. One of these products is power transformers which are a basic piece of generation, transmission, distribution and consumption of electrical energy. The operation of these machines implies the transformation of energy, a part of this energy is dissipated in electrical and magnetic circuits. The amount of losses produce by transformers is defined during the design of these machines. So, they must comply with the above EU Directive. In fact, the Official Journal of the European Union has set a list of energy efficiency limits to be fulfilled by new machines sold in Europe (Commission Regulation 548/2014). This article presents three parts. The calculation of the maximum performance is presented in the first part. This is independent of the load percentage, the impedance and the voltage level. A description of the European fleet of power transformer, up to 100MVA is presented on the second section. In the last part of this work...

Preliminary results of a power quality survey in a distribution network bases on No‐Gap PQ meters

González, A.; Madrazo Maza, Alfredo; Laso Pérez, Alberto; Martínez Torre, Raquel; Domingo Fernández, Rodrigo; Mañana Canteli, Mario; Arroyo Gutiérrez, Alberto; Cavia Soto, María de los Ángeles
Fonte: European Association for the Development of Renewable Energies, Environment and Power Quality (EA4EPQ) Publicador: European Association for the Development of Renewable Energies, Environment and Power Quality (EA4EPQ)
Tipo: info:eu-repo/semantics/article; publishedVersion
ENG
Relevância na Pesquisa
46.11%
This paper describes a preliminary experience with the installation and use of a no-gap power quality meter network along a distribution grid in the North of Spain. No-gap power quality meters record all cycles of voltage and current waveform for all the monitored channels. This approach extends the analysis further than the classical approach provided by other power quality meters that records only survey data and events triggered according predefined rules. A comparison with the classical approach is discussed and the results of a two year power quality survey are also provided.

Utility-Scale Solar Photovoltaic Power Plants; A Project Developer’s Guide

International Finance Corporation
Fonte: Washington, DC Publicador: Washington, DC
Tipo: Working Paper; Publications & Research; Publications & Research :: Working Paper
ENGLISH; EN_US
Relevância na Pesquisa
36.24%
With an installed capacity greater than 137 gigawatts (GWs) worldwide and annual additions of about 40 GWs in recent years, solar photovoltaic (PV) technology has become an increasingly important energy supply option. A substantial decline in the cost of solar PV power plants (80 percent reduction since 2008) has improved solar PV’s competitiveness, reducing the needs for subsidies and enabling solar to compete with other power generation options in some markets. The World Bank Group (including the International Bank for Reconstruction and Development, the International Development Association, International Finance Corporation (IFC), and the Multilateral Investment Guarantee Agency) helps client countries secure the affordable, reliable, and sustainable energy supply needed to end extreme poverty and promote shared prosperity. The approach mirrors the objectives of the sustainable energy for all initiative - achieving universal access, accelerating improvements in energy efficiency, and doubling the global share of renewable energy by 2030. The World Bank Group recognizes that each country determines its own path for achieving its energy aspirations...

Hydroelectric Power; A Guide for Developers and Investors

International Finance Corporation
Fonte: Washington, DC Publicador: Washington, DC
Tipo: Working Paper; Publications & Research; Publications & Research :: Working Paper
ENGLISH; EN_US
Relevância na Pesquisa
36.24%
Worldwide, hydropower is a crucial power supply option for several reasons. First, it is a renewable energy resource that can contribute to sustainable development by generating local, typically inexpensive power. Second, hydropower reduces reliance on imported fuels that carry the risks of price volatility, supply uncertainty and foreign currency requirements. Third, hydro systems can offer multiple co-benefits including water storage for drinking and irrigation, drought-preparedness, flood control protection, aquaculture and recreational opportunities, among others. Finally, hydro can allow more renewables, especially wind and solar, to be added to the system by providing rapid-response power when intermittent sources are off-line, and pumped energy storage when such sources are generating excess power

Underpowered : The State of the Power Sector in Sub-Saharan Africa

Eberhard, Anton; Foster, Vivien; Briceño-Garmendia, Cecilia; Ouedraogo, Fatimata; Camos, Daniel; Shkaratan, Maria
Fonte: World Bank, Washington, DC Publicador: World Bank, Washington, DC
Tipo: Economic & Sector Work :: Energy Study; Economic & Sector Work
ENGLISH
Relevância na Pesquisa
36.25%
Sub-Saharan Africa is in the midst of a power crisis marked by insufficient generating capacity, unreliable supplies, high prices, and low rates of popular access to the electricity grid. The region's capacity for generating power is lower than that of any other world region, and growth in that capacity has stagnated. The average price of power in Sub-Saharan Africa is double that of other developing regions, but supply is unreliable. Because new household connections in many countries are not keeping up with population growth, the electrification rate, already low, is actually declining. The manifestations of the current crisis are symptoms of deeper problems that are explored in this study of power sector institutions in 24 countries of Sub-Saharan Africa, which draws extensively on a new body of research undertaken as part of the multi-donor Africa Infrastructure Country Diagnostic (AICD). There are nearly 60 medium- to longer-term power sector projects involving the private sector in the region excluding leases for emergency power generation. Almost half of these are independent power producers (IPPs). Involving more than $2 billion of private sector investment...

Physical clearing mechanisms in power industry

Atkins, Karla; Homan, Christopher; Marathe, Achla
Fonte: IEEE: Proceedings of the 2004 IEEE PES Power Systems Conference and Exposition Publicador: IEEE: Proceedings of the 2004 IEEE PES Power Systems Conference and Exposition
Tipo: Proceedings
EN_US
Relevância na Pesquisa
46.09%
This paper studies the performance of several different physical clearing mechanisms in the electricity market. The study is done using the simulation tool, Marketecture, developed at the Los Alamos National Laboratory. Two cities, Portland and Chicago, are used for simulating the physical clearing algorithms. The algorithms were chosen according to their ability to serve as a proxy for some of the well known policies. Our results show that, based on the economic measures chosen, both cities perform very similarly under the different physical clearing mechanisms.; "Physical Clearing Mechanisms in Power Industry," Proceedings of the 2004 IEEE PES Power Systems Conference and Exposition. Held in New York, New York: 10-13 October 2004.; ©2009 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.