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Rozprawy doktorskie na temat „IMPACTS OF POWER QUALITY”

Autor: Grafiati

Data publikacji: 11 września 2023

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1

Mngxuma, Khayakazi. "The power quality of wind turbines in Sout Africa and their impacts on distribution networks." Master's thesis, University of Cape Town, 2005. http://hdl.handle.net/11427/5157.

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Includes bibliographical references (leaves 75-78).<br>This thesis describes an investigation into the power quality of wind turbines and the impacts this could have on distribution networks. The main focus is on voltage fluctuations and flicker as grid connected wind turbines could have a huge impact on these, especially when connected to weak distribution networks.

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Choudhry, Mohammad A. "A methodology for evaluating energy efficient lighting technologies for their performance, power quality and environmental impacts." Diss., Virginia Tech, 1995. http://hdl.handle.net/10919/40213.

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Orebrand, Idah, Max Rosvall, and Melissa Eklund. "Microgeneration of PV power and its impact on power quality in the distribution grid." Thesis, Uppsala universitet, Institutionen för teknikvetenskaper, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-324313.

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This bachelor thesis examines the impacts of installed microgeneration of PV power in the distribution grid. The thesis examines the selected distribution grids power quality and how it is affected in terms of exceeding currents, voltages and reverse power flows and how the future trend of microgeneration of PV power will develop. A case study is made on Gotland with the support of the distribution grid owner, GEAB. Three of GEAB's distribution grids with different customer configurations and grid structures are being used to create different case scenarios. The production from the PV plants i

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Taylor, Ryan. "The economic impact of poor power quality to New Zealand." Thesis, University of Canterbury. Engineering, 2011. http://hdl.handle.net/10092/8973.

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This project entitled 'The Economic Impact of Poor Power Quality to New Zealand' aims to identify the most problematic and costly power quality issues for industry and residential customers in New Zealand. The economic cost or poor power quality will be used by the EPECentre in their future power quality work. Some recommendations are included from the researcher where appropriate. Society is becoming more dependent on computers and digital circuitry. Industry, commercial and residential users are now dependent on a reliable, high-quality electrical power source to ensure these devices are ope

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Morales, Ana. "Impact of decentralized power on power systems." Doctoral thesis, Universite Libre de Bruxelles, 2006. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210841.

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Wind generation is one of the most successful sources of renewable energy for the production of electrical energy. Wind power offers relatively high capacities, with generation costs that are becoming competitive with conventional energy sources. However, a major problem to its effective use as a power source is the fact that it is both intermittent and diffuse as wind speed is highly variable and site-specific. This is translated in large voltage and frequency excursions and dynamically unstable situations when fast wind power changes. Very high wind speeds will result in sudden loss of wind

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Neto, Aimé Fleury de Carvalho Pinto. "Avaliação do impacto de sistemas fotovoltaicos conectados à rede de distribuição de baixa tensão." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/86/86131/tde-09112016-201805/.

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Este trabalho apresenta a avaliação dos impactos elétricos da inserção da geração distribuída de sistemas fotovoltaicos conectados à rede de distribuição em baixa tensão, com a finalidade de identificar os impactos e demonstrar que estes podem ser controlados. O estudo consistiu de uma avaliação teórica e de um estudo de caso da inserção da geração fotovoltaica considerando aspectos da qualidade de energia da rede, curva de carga resultante, vida útil de transformadores e gestão ativa da demanda. Os resultados mostraram que a inserção da geração fotovoltaica na rede de baixa tensão altera a cu

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Villegas, Ruiz Eloy Ángel. "Wave aberrations in ophthalmic progressive power lenses and impact on visual quality." Doctoral thesis, Universidad de Murcia, 2009. http://hdl.handle.net/10803/10843.

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Las lentes progresivas (LP) para gafas es una solución muy extendida para la presbicia, ya que proporcionan una visión continua a todas las distancias debido a un cambio progresivo de potencia. En este trabajo se han medido las aberraciones de frente de onda espacialmente resueltas y la calidad visual en estas lentes. Además del astigmatismo que aumenta periféricamente, también se han encontrado pequeños valores de aberraciones de tercer orden, coma y trefoil, que producen un bajo deterioro de la calidad óptica y visual. El logaritmo de métricas sobre la PSF del sistema lente con ojo son las q

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Van, der Westhuizen Bernard Cornelius. "Impact of coal quality on equipment lifetime at coal-fired power stations." Diss., University of Pretoria, 2019. http://hdl.handle.net/2263/79670.

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With the export of coal being more lucrative than selling coal to South African power producers, power station operators might consider accepting lower-quality coal. While the impact lower quality coal has on cycle efficiency is understood, the influence it has on equipment reliability and lifetime is often not understood. This study focusses on addressing the question of how different characteristics of coal influences different damage mechanisms of common power station equipment. The results are translated into a reference framework that can be used when coal quality variation is expected. T

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Thapar, Alok. "Investigation of power quality catagorisation and simulating its impact on sensitive electronic equipment /." [St. Lucia, Qld.], 2004. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe18160.pdf.

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MATOS, JANARA de C. "Aspectos hidrobiologicos do complexo de represas Paraibuna-Piratininga, Sao Paulo, com enfase na comunidade fitoplanctonica." reponame:Repositório Institucional do IPEN, 2010. http://repositorio.ipen.br:8080/xmlui/handle/123456789/9513.

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Made available in DSpace on 2014-10-09T12:27:30Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T14:08:22Z (GMT). No. of bitstreams: 0<br>Dissertacao (Mestrado)<br>IPEN/D<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP

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Galetta, Wilhelmina Magdalene. "Factors that impact project quality at a nuclear power plant in South Africa." Thesis, Cape Peninsula University of Technology, 2013. http://hdl.handle.net/20.500.11838/955.

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Thesis submitted in fulfilment of the requirements for the degree Master of Technology: Business Administration in Project Management in the Faculty of Business at the Cape Peninsula University of Technology 2013<br>The nuclear industry has established stringent controls to ensure that electricity is produced in a safe and reliable manner. It is expected that a nuclear power plant should be operated safely, adheres to processes and procedures that govern those safe operations, and implements projects or modifications that are of a high quality; and this would be considered as ‘business

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Gumede, Nomfusi Leticia. "An investigation on the impact of procurement quality management in a nuclear power station." Thesis, Cape Peninsula University of Technology, 2011. http://hdl.handle.net/20.500.11838/2221.

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Thesis (MTech (Quality))--Cape Peninsula University of Technology, 2011.<br>This research project in Procurement Quality Engineering was conducted at a Nuclear Power Generation Company in the Western Cape, South Africa. During the past decade, quality management has become increasingly recognised as highly desirable for all organisations at all levels. All organisations, to varied degrees, can benefit from the application of quality management skills in some parts of their daily operations. The research project will investigate the impact or effect of late deliveries of spares on the op

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Ntsadu, Ntlahla. "Impact assessment of large-scale penetration of permanent magnet synchronous generators on power quality." Master's thesis, University of Cape Town, 2017. http://hdl.handle.net/11427/26891.

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Wind power generation has gained a large share in the renewable energy market over the past few years. This study investigates the impact of large scale penetration of permanent magnet synchronous generator (PMSG) based wind turbines on power quality of the grid. PMSGs are attractive due to the absence of a gearbox in the drive-train, which results in lower maintenance costs and higher reliability. Moreover, the advancements in power electronics have facilitated PMSGs to generate optimal power at varying wind speed conditions. This is achieved through the use of maximum power point tracking al

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14

Carlsson, Fredrik. "On impacts and ride-through of voltage sags exposing line-operated AC-machines and metal processes." Doctoral thesis, KTH, Electrical Systems, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3681.

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<p>During the last decade, power quality has been recognised asa global problem. Among different types of power qualityproblems, voltage sags have been identified to be one of themost severe problems for different process industries. The mostcommon reason to voltage sags is lightning strikes in powerlines. Protection equipment, usually located at switchyards,disconnect faulted power lines as soon as possible, which isapproximately 100 ms. Thus, the duration of voltage sags areapproximately 100 ms. The sensitivity to voltage sags ofelectrical equipment in process industries can be observed asfo

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15

Akinyemi, Ayodeji Stephen. "Assesment of renewable energy resources and the impact of DG on power quality in distribution network." Master's thesis, University of Cape Town, 2015. http://hdl.handle.net/11427/13563.

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Includes bibliography.<br>For many years, power systems were vertically operated; large power generation plants produced all of the electrical power. This kind of generation is often related to adequate geographical placement such as water sources, coal sources etc. The power is then transmitted towards large consumption centres over long distances using different high-voltage transmission levels. This operating structure was built on the basis of economy, security, and quality of supply. This very centralized structure is operated by hierarchical control centres and allows the system to be mo

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Björn, Robert, and Anders Westlinder. "Energy savings by using low energy light bulbs and automation,and the impact on the power quality." Thesis, Linköpings universitet, Institutionen för teknik och naturvetenskap, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-80518.

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Detta examensarbete har utförts i samarbete med Kjell & Company som är en rikstäckande butikskedja som tillhandahåller hemelektronikprodukter via internet och 55 butiker fördelade över 30 orter. Syftet med detta examensarbete är att jämföra elförbrukning och kostnader för olika lågenergilampor med glödlampan som referens samt att studera elkvalitén med avseende på eventuella nätstörningar lamporna kan ge upphov till och även undersöka om det går att minska elförbrukningen genom att automatisera exempelvis belysning och annan elutrustning. Undersökningen har gjorts genom att mäta på lampor

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Al-Azmi, Bader N. A. "Impact of emissions results from power generation on the air quality of selected urban areas in Kuwait." Thesis, Loughborough University, 2009. https://dspace.lboro.ac.uk/2134/36134.

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Air pollution in urban areas is a problem affecting many countries in the world and has important implications for health and environmental management. However, air quality prediction plays an important role in the controlling air pollution problem. Air-quality models are also extensively used in all aspects of air pollution control and to predict spatial and temporal dispersion of pollutants in the atmosphere. The main objectives of this work are to provide an overview of the pollutant levels and their trends in the study area (Rabia) and to predict the ground level concentrations of sulphur

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Iessa, Hassan. "Concentrating food materials using electrokinetically enhanced filtration (EKEF) : impact on filtration efficiency, quality compounds and power consumption." Thesis, University of Newcastle upon Tyne, 2016. http://hdl.handle.net/10443/3483.

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Countries around the world are suffering from many problems caused by the misuse of their resources either by using non-renewable ones or destroying the valuable features of the resources that are available. Some of the most important challenges facing humanity are related to food and energy security. Food security includes many aspects besides providing people with an adequate amount of safe and healthy food; it also includes improving food processing to produce acceptable, high quality food products with reduced losses of nutrients, carbon footprint and using fewer resources in the productio

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Reed, Donna K. "Impact zone delineation for biological assessment of power plant effluent effects on snail populations in the Clinch River." Diss., Virginia Tech, 1993. http://hdl.handle.net/10919/38639.

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Carter, Shaun A. "Geochemical analysis of the Powder River, Wyoming/Montana and an assessment of the impacts of coalbed natural gas co-produced water." Laramie, Wyo. : University of Wyoming, 2008. http://proquest.umi.com/pqdweb?did=1663116711&sid=1&Fmt=2&clientId=18949&RQT=309&VName=PQD.

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Chen, Cheng. "The Impact of Voltage Dip Characteristics on Low Voltage Ride Through of DFIG-based Wind Turbines." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-254388.

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In last decade, there is a large increase in installed capacity of wind power. Asmore wind power is integrated into utility networks, related technologychallenges draw much attention. The doubly fed induction generator (DFIG) isthe mainstream choice for wind turbine generator (WTG) in current market andthe object of this thesis. It is very sensitive to voltage dips. The enhancement oflow voltage ride through (LVRT) is one of the most important issues for DFIG,and many works have already been done to provide solutions.In current works, the voltage dip waveforms that are applied in LVRTrelated w

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22

Pignatti, Alex Almeida. "O impacto da topologia de conexão de transdutores na obtenção de indicadores de qualidade de energia." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/3/3143/tde-15072013-154428/.

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A Agência Nacional de Energia Elétrica (ANEEL) deverá estabelecer a regulamentação para distúrbios de qualidade de energia em um futuro próximo. Há ainda questões em aberto sobre os procedimentos de medição e limites máximos para os indicadores de qualidade de energia. Este trabalho aborda uma dessas questões, que é a conexão de transdutores e os impactos nos índices de qualidade de energia associados. Simulações em ATPDraw e campanhas de medição foram realizadas de modo a identificar o comportamento dos indicadores de distorção harmónica sob as duas configurações possíveis de conexão de trans

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Romero, Mauro. "The impact of marketing actions on the perception of quality and satisfaction of consumers of electricity in the state of Ceara." Universidade Federal do CearÃ, 2007. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=3539.

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As mudanÃas no mercado regulado pelo Estado exigiram uma adequaÃÃo do foco produtivo das concessionÃrias de energia elÃtrica em atingir as metas dos indicadores de desempenho tÃcnico e operacional, para o foco na satisfaÃÃo do consumidor dentro de suas expectativas. Desta forma, este trabalho desenvolve um estudo exploratÃrio junto a uma empresa do ramo de energia elÃtrica localizada no Estado do CearÃ, com o propÃsito de verificar as relaÃÃes entre suas aÃÃes de marketing e o nÃvel de satisfaÃÃo de seus clientes. Por meio da teoria que aborda a estrutura das caracterÃsticas intrÃnsecas Ã prod

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Namkoong, Gon. "Molecular beam epitaxy grown III-nitride materials for high-power and high-temperture applications : impact of nucleation kinetics on material and device structure quality." Diss., Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/16426.

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Bouhadda, Hanen. "Impacts des non-linéarités dans les systèmes multi-porteuses de type FBMC-OQAM." Thesis, Paris, CNAM, 2016. http://www.theses.fr/2016CNAM1115/document.

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Dans cette thèse une étude des performances des systèmes OFDM et FBMC/OQAM en présence d'amplificateur de puissance sans mémoire en terme de TEB est présentée. Ensuite, nous avons proposé une technique de linéarisation d'AP par pré-distorsion adaptative neuronale. Aussi, nous avons proposé deux techniques de correction des non-linéarités au niveau du récepteur<br>In our work, we have studied the impact of in-band non linear distortions caused by PA on both OFDM and FBMC/OQAM systems. A theoretical approach was proposed to evaluate the BER performance for the two systems. This approach is based

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Paludo, Juliana Aramizu. "Avaliação dos impactos de elevados níveis de penetração da geração fotovoltaica no desempenho de sistemas de distribuição de energia elétrica em regime permanente." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/18/18154/tde-23042014-153815/.

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O emprego de geradores fotovoltaicos (FV) conectados ao sistema de distribuição de energia elétrica tem apresentado um crescimento significativo na última década. No Brasil, sua existência ainda é reduzida, entretanto a previsão é que esta aumente nos próximos anos em função das novas regulamentações estabelecidas pelas concessionárias de energia, com apoio da Agência Nacional de Energia Elétrica. O estudo das consequências trazidas pela conexão massiva de geradores FV possibilita o planejamento correto de operação do sistema de distribuição, evitando assim, a degradação da qualidade da energi

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Oliveira, Roger Alves de. "Afundamentos de tensão em consumidores industriais : uma análise baseada no fator de impacto e na severidade dos eventos considerando os efeitos de faltas elétricas em sistemas de potência." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2018. http://hdl.handle.net/10183/185257.

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The present work deals with a comparative analysis of IEEE 1564 standardization and Module 8 of Distribution Procedures of the Brazilian Agency of Electrical Regulation, within the scope of voltage sags. For such comparison, a case study of monitoring is performed on an industrial consumer sensitive to the disturbance during 24 months. Additionally, since the main causes of the voltage sags are the electrical faults of the system to which the industry is inserted, the relations between both events are analyzed. From the simultaneity of these contingencies, a unique set of data was obtained thr

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Motoki, Edison Massao. "Procedimentos para mitigação do impacto de qualidade de energia na indústria têxtil." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/3/3143/tde-27072007-164807/.

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O avanço crescente da tecnologia nos processos industriais atuais, bem como o elevado grau de interação de equipamentos e processos, provocou o aumento da sua sensibilidade a variações de energia, ou o aumento do grau de sensibilidade de algumas cargas industriais, o que gera interrupções de produção industrial. Essas, ocasionadas por problemas de qualidade de energia, levam a diversos fatores indesejáveis às indústrias, tais como: perdas de produção, perdas de faturamento, perda de matéria-prima, uso irracional de energia, dentre outros. Um processo têxtil apresenta grandes perdas de produção

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Ramos, Mário César Giacco. "Uma contribuição para a área de saúde por meio da verificação do impacto da qualidade de energia e das instalações elétricas nos equipamentos eletromédicos." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/3/3143/tde-01072009-120057/.

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Em todos os segmentos da sociedade, a utilização de equipamentos eletrônicos projetados e construídos com avançadas tecnologias eletrônicas e controlados por microprocessadores aumenta a cada dia. Na área de saúde, denominados de equipamentos eletromédicos, dão suporte aos setores de diagnóstico, tratamento ou, procedimento cirúrgico, melhorando a qualidade dos serviços e o atendimento aos pacientes. No entanto, o sucesso global do processo deverá considerar a qualidade das instalações elétricas nesses ambientes, bem como a qualidade da energia elétrica fornecida a esses equipamentos. Este tra

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Gadelha, Thayannã Yury Furtado. "Impacto dos sistemas de geração distribuída fotovoltaica sobre a tensão em regime permanente das redes de distribuição /." Ilha Solteira, 2019. http://hdl.handle.net/11449/190754.

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Orientador: Júlio Borges de Souza<br>Resumo: Devido a um conjunto de questões econômicas e ambientais, a geração distribuída baseada em fontes renováveis tem sido incentivada por vários países. No Brasil, a conexão de unidades de geração distribuída fotovoltaica (GDFV) às redes de distribuição de baixa tensão, por meio de unidades residenciais e comerciais, tem apresentado uma rápida expansão. Diante deste cenário, é necessário investigar os possíveis impactos negativos que tal expansão pode resultar sobre os sistemas de distribuição. Neste trabalho, busca-se avaliar o impacto sobre a tensão e

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Arango, Tania Paola Ledesma. "Avaliação do impacto de motores de indução trifásicos em redes de distribuição de energia elétrica e uma proposta de regulamentação para seu acesso às redes de baixa tensão." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/3/3143/tde-28102009-094244/.

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Este trabalho tem por objetivo apresentar e discutir alguns modelos desenvolvidos para a avaliação do impacto de motores de indução trifásicos nas redes de distribuição de energia elétrica partindo de seus dados de placa e utilizando algoritmos evolutivos para o cálculo dos parâmetros elétricos do circuito equivalente do motor. A discussão é de fundamental importância, na medida em que as distorções na onda de tensão impactam diretamente na qualidade do suprimento promovida por uma concessionária de energia elétrica, a qual deve fornecer aos seus consumidores uma tensão puramente senoidal, co

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Barrett, S. R. H. "The air quality impacts of aviation." Thesis, University of Cambridge, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.596408.

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This thesis takes a multi-scale approach to addressing the issue of air quality and human health impacts attributable to aviation. In particular, processes at the exhaust plume (~ 1 km), local (~ 10 km), regional (~ 1000 km) and global (~ 10 000 km) scale are addressed. At the plume scale, a three-dimensional integral plume model is developed and applied to elucidate aspects of near-field dispersion processes. A new method for approximating dispersion at the local scale is developed, which allows the air quality in the vicinity of large numbers of airports to be rapidly estimated. At the regio

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Navarrete, Pablo-Romero Javier. "Power Quality for Distributed Wind Power Generation." Thesis, KTH, Elektroteknisk teori och konstruktion, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-105221.

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Wind power often is a source of voltage fluctuations and possible voltage issues are raised when considering interconnecting wind turbines to an electric grid. Also, the power electronics introduced in the wind turbines might insert more fluctuations and different PQ problems. Distributed generation seems to be a good option in order to try to mitigate these problems. The first goal of the work is to create a model of a small electric grid, using MATLAB/Simulink. The models aims to simulate various DFIG wind turbines coupled to the grid in different conditions of location and wind. Then, the m

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Suwanapingkarl, Pasist. "Power quality analysis of future power networks." Thesis, Northumbria University, 2012. http://nrl.northumbria.ac.uk/12625/.

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SILVA, Tiago Alencar. "AVALIAÇÃO PROBABILÍSTICA DO IMPACTO DA GERAÇÃO DISTRIBUÍDA EÓLICA NOS AFUNDAMENTOS DE TENSÃO DE CURTA DURAÇÃO." Universidade Federal do Maranhão, 2012. http://tedebc.ufma.br:8080/jspui/handle/tede/1875.

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Submitted by Maria Aparecida (cidazen@gmail.com) on 2017-08-29T13:12:16Z No. of bitstreams: 1 Tiago Silva.pdf: 3175763 bytes, checksum: 8eba0f17a1a1f6fa2606a5235969987e (MD5)<br>Made available in DSpace on 2017-08-29T13:12:16Z (GMT). No. of bitstreams: 1 Tiago Silva.pdf: 3175763 bytes, checksum: 8eba0f17a1a1f6fa2606a5235969987e (MD5) Previous issue date: 2012-11-09<br>CNPQ<br>The Distributed Generation (DG) can improve the power quality indices associated with Short Duration Voltage Variations (SDVV) due to the reduction in the electric network loading, which in turn causes an improvement in

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Farzanehrafat, Ali. "Power Quality State Estimation." Thesis, University of Canterbury. Electrical and Computer Engineering, 2014. http://hdl.handle.net/10092/9830.

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Traditional state estimation whereby the state of the system is assessed based on a limited number of measurements is a well established tool for steady-state situations where the frequency of the system is 50 Hz. Previous contributions have looked at extending this concept to the power quality area. This area of research is called Power Quality State Estimation (PQSE) and represents a class of techniques. Under the umbrella of PQSE, the main contribution of this work is taking Transient State Estimation (TSE) on step further. A new three-phase formulation for TSE using the Numerical Integrato

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Hornik, Tomas. "Power quality in microgrids." Thesis, University of Liverpool, 2010. http://livrepository.liverpool.ac.uk/1456/.

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Rapidly increasing energy demand from the industrial and commercial sector, especially in the current climate of high oil prices, steadily reducing energy sources and at the same time increased concerns about environmental changes, have caused fast development of Distributed Power Generation Systems (DPGS) based on renewable energy. A recent concept is to group DPGS and the associated loads to a common local area forming a small power system called a microgrid. This small autonomous system formed by DPGS can offer increased reliability and effciency of future power system networks. Furthermore

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Gomez, Alvita Maria. "Manufacturing equipment changeover impacts on component quality." Online version, 2008. http://www.uwstout.edu/lib/thesis/2008/2008gomeza.pdf.

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Khadkikar, Vinod. "Power quality enhancement at distribution level utilizing the unified power quality conditioner (UPQC)." Mémoire, École de technologie supérieure, 2008. http://espace.etsmtl.ca/164/1/KHADKIKAR_Vinod.pdf.

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Les equipements bases sur de Felectronique de puissance emergent rapidement telle une composante essentielle aux systemes de distribution a haute puissance modernes. Les equipements de conversion de la puissance qui beneficient de cette technologic offrent un eventail de possibilites et permettent entre autre une flexibilite de controle, une reduction des coiats, une optimisation des Fespace et des performances, etc. D'un autre cote, Foperation de ces equipements peut entrainer certains des plus serieux problemes de la qualite de I'onde tels une consommation de puissance reactive et la g

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Patocka, Filip. "Environmental Impacts of Pumped Storage Hydro Power Plants." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for vann- og miljøteknikk, 2014. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-26677.

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Massive development of new renewable energy sources is taking place all over the world in 21st century and Europe is not an exception. Wind turbine parks are being planned and built on shore, in coastal zones and in the seas of European countries.With such a development of renewable sources comes a challenge of stable and continuous supply of electrical power which meets the demand. Renewable energy sources often have power output which cannot be easily regulated according to demand, but are rather fully dependent on forces in nature, such as a wind speed for wind power turbines, or solar radi

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Tai, Sio Un. "Power quality study in Macau and virtual power analyzer." Thesis, University of Macau, 2012. http://umaclib3.umac.mo/record=b2586277.

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Pan, Haibo 1973. "SMES for power quality improvement and uninterruptible power supply." Thesis, McGill University, 2000. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=33342.

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The history of applied superconductor-based equipment in industry, especially in power system, is briefly reviewed. The thesis presents a development of a superconducting magnetic energy storage system for power quality improvement and uninterruptible power supply (PQ/UPS SMES). The configuration of such a system and its control concept are analyzed in full details. Evaluation tests of an SMES system operating on a simple power system are presented and analyzed. They validate the applicability of such a system, as an attractive alternative for power quality improvement and uninterruptable powe

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Davis, Christina Clarkson. "Understanding and Predicting Water Quality Impacts on Coagulation." Diss., Virginia Tech, 2014. http://hdl.handle.net/10919/70883.

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Effective coagulation is critical to the production of safe, potable drinking water, but variations in the chemical composition of source water can present challenges in achieving targeted contaminant removal and predicting coagulation outcomes. A critical literature review describes factors affecting the hydrolysis reactions of metal salt coagulants and the resulting precipitates. Properties of two key contaminants, turbidity and natural organic matter (NOM), are explored in the context of removal during coagulation, and the influence of co-occurring ions is described. While it is apparen

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Abou-Senna, Hatem. "Microscopic Assessment of Transportation Emissions on Limited Access Highways." Doctoral diss., University of Central Florida, 2012. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5090.

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On-road vehicles are a major source of transportation carbon dioxide (CO2) greenhouse gas emissions in all the developed countries, and in many of the developing countries in the world. Similarly, several criteria air pollutants are associated with transportation, e.g., carbon monoxide (CO), nitrogen oxides (NOx), and particulate matter (PM). The need to accurately quantify transportation-related emissions from vehicles is essential. Transportation agencies and researchers in the past have estimated emissions using one average speed and volume on a long stretch of roadway. With MOVES, there

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Bryans, A. G. "Impacts of tidal stream devices on electrical power systems." Thesis, Queen's University Belfast, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.438131.

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KANT, VINAY. "REAL TIME MONITORING OF IMPACTS OF POWER QUALITY ON INDUSTRIAL MOTOR EFFICIENCY." Thesis, 2022. http://dspace.dtu.ac.in:8080/jspui/handle/repository/19706.

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This work focused on Impacts of power quality on an online induction motor in a real time basis. The work involves creating variable conditions in the input power supply and analyzing its impacts on motor performance specially efficiency. Input power supply is modulated in two aspects, first one is voltage fluctuation and second one is voltage unbalance. For the conduct of test a 10 HP induction motor is selected which is run under test condition for half an hour. During test input supply voltage is varied on both sides of the rated voltage of the motor with the help of servo voltag

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Muthige, Mavhungu Sydney. "Ambient air quality impacts of a coal-fired power station in Lephalale area." Thesis, 2014.

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Lephalale Municipality is a predominantly rural Municipality with 38 villages, two townships (Marapong and Onverwacht) and one town, Lephalale. Lephalale, formerly known as Ellisras, is a town situated in the “heart of the Bushveld” in Limpopo province. The town is growing rapidly and more industries are becoming concentrated within this small town. The construction of Medupi power station which is underway and other projects such as the expansion of Grootegeluk mine (coal 3 and 4 projects), and road developments in the area; have led to concern about the ambient air quality of the area. Other

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"Distributed Photovoltaic Generation in Residential Distribution Systems: Impacts on Power Quality and Anti-islanding." Master's thesis, 2013. http://hdl.handle.net/2286/R.I.17741.

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abstract: The past few decades have seen a consistent growth of distributed PV sources. Distributed PV, like other DG sources, can be located at or near load centers and provide benefits which traditional generation may lack. However, distribution systems were not designed to accommodate such power generation sources as these sources might lead to operational as well as power quality issues. A high penetration of distributed PV resources may lead to bi-directional power flow resulting in voltage swells, increased losses and overloading of conductors. Voltage unbalance is a concern in distribut

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Tsai, Hsin-ting, and 蔡欣庭. "Review of the Impacts on Power Quality and System Stability to Power Systems by New Energy Systems :Wind Power﹐Photovoltaic and Fuel Cell." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/01099639640694189342.

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碩士<br>國立中正大學<br>電機工程所<br>97<br>Energy demands from human beings are increasing. Electricity usage is also rising from year to year. Nowadays, most electricity comes from the conversion of fossil and hydro energies. Fossil energy storage is limited on earth and using fossil energies would produce green house effect. Sustainable energy conversion technologies are developing around the globe to replace the dependence on fossil-based generation. New electricity generation technologies, e.g. wind turbine, photovoltaic, fuel cell and etc., are penetrating in the power system network in a great incre

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LEE, TSUNG-MING, and 李宗明. "IMPACT OF MINIMUM SHORT-CIRCUIT CURRENT ON POWER QUALITY REGULATION." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/39971275542595082074.

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碩士<br>國立清華大學<br>電機工程研究所<br>83<br>The harmonic or three-phase unbalance current injection into the Taiwan Power (Taipower) system due to customer''s nonlinear load can cause the voltage distortion at Taipower''s substation. This voltage distortion also varies with the system impedance of Taipower.For example,during the base-load duration, because the system impedance is high (or the three-phase short-circuit current,abbreviated by 3-φ SCC, is low),the injection current can cause a higher vol

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