No Blog Eletrônica de Potência você encontrará informações sobre teses,artigos,seminarios,congressos,tecnologias,cursos,sobre eletrônica potência. “TEMOS O DESTINO QUE MERECEMOS. O NOSSO DESTINO ESTA DE ACORDO COM OS NOSSOS MERITOS” ALBERT EINSTEIN. Imagination is more important than knowledge, for knowledge is limited while imagination embraces the entire world. EL FUTURO SE CONSTRUYE HOY,EL SUCESSO NO ES FRUTO DE LA CASUALIDAD,SE HUMILDE ,APRENDE SIEMPRE CADA DIA.
AUTOR DO BLOG ENG.ARMANDO CAVERO MIRANDA SÃO PAULO BRASIL
"OBRIGADO DEUS PELA VIDA,PELA MINHA FAMILIA,PELO TRABALHO,PELO PÃO DE CADA DIA,PROTEGENOS DO MAL"
“SE SEUS PROJETOS FOREM PARA UM ANO,SEMEIE O GRÂO.SE FOREM PARA DEZ ANOS,PLANTE UMA ÁRVORE.SE FOREM PARA CEM ANOS,EDUQUE O POVO.”
“Sixty years ago I knew everything; now I know nothing; education is a progressive discovery of our own ignorance. Will Durant”
domingo, 25 de novembro de 2012
sexta-feira, 23 de novembro de 2012
ANALISE DO SISTEMA ELETRICO DE UMA UNIDADE DE PRODUÇÃO DE PETROLEO
ANALISE DO SISTEMA ELETRICO DE UMA UNIDADE DE PRODUÇÃO DE PETROLEO
RENATA ALVES CASANOVA
WAGNER GUEDES GUIMARAES PEREIRA
PROJETO SUBMETIDO AO CORPO DOCENTE DO DEPARTAMENTO DE ENGENHARIA ELETRICA DA ESCOLA POLITECNICA DA UNIVERSIDADE FEDERAL DE RIO DE JANEIRO COMO PARTE DOS REQUISITOS NECESSARIOS PARA OBTENÇÃO DO GRAU DE ENGENHEIRO
ELETRICISTA
LINK
http://www.mediafire.com/view/?6tq2tfgt31kkjf2
ELETRICISTA
LINK
http://www.mediafire.com/view/?6tq2tfgt31kkjf2
domingo, 18 de novembro de 2012
Qualifying and Labeling of Inverters for Grid-Connected Photovoltaic Systems - Qualificação e etiquetagem de inversores para sistemas fotovoltaicos conectados à rede PARTE I
TESIS QUALIFICAÇAO E ETIQUETAGEM DE INVERSORES PARA SISTEMAS FOTOVOLTAICOS CONETADOS A REDE PARTE-I from armando cavero on Vimeo. Dissertação de Mestrado Autor Pinto Neto, Aime Fleury de Carvalho (Catálogo USP)
Nome completo Aime Fleury de Carvalho Pinto Neto
Unidade da USP Energia Área do Conhecimento Energia Data de Defesa 2012-05-30 Imprenta São Paulo,2012
Orientador Zilles, Roberto (Catálogo USP) Banca examinadora Zilles, Roberto (Presidente) Pinho, João Tavares Rüther, Ricardo
Título em português Qualificação e etiquetagem de inversores para sistemas fotovoltaicos conectados à rede Resumo em português
Este trabalho apresenta o desenvolvimento de uma metodologia para a etiquetagem e qualificação de inversores para Sistemas Fotovoltaicos Conectados à Rede, com finalidade de servir de proposta de procedimento para inclusão no Regulamento de Avaliação de Conformidade de Equipamentos e Sistemas Fotovoltaicos do Programa Brasileiro de Etiquetagem. O procedimento desenvolvido avalia os inversores quanto à eficiência, qualidade de energia, proteções e informações operacionais e de instalação.
ESTA TESIS ESTA DIVIDIDO EM 02 PARTES This work presents the development of a methodology for qualification and labeling of inverters for grid-connected photovoltaic systems, aiming serving as procedural proposal for inclusion in the Conformity Assessment Rules of Equipments and Photovoltaic Systems of the Brazilian Labeling Program. The developed procedure evaluates the inverters efficiency, power quality, protections and operational and installation information.
LINK THESIS FULL
http://www.teses.usp.br/teses/disponiveis/86/86131/tde-28062012-174659/publico/Dissertacao.pdf
sábado, 10 de novembro de 2012
terça-feira, 6 de novembro de 2012
具柔性切換單元之脈寬調變轉換器 推演與應用 Development and Application of PWM Converters with Soft-Switching Cells
Development and Application of PWM Converters with
Soft-Switching Cells
研 究 生:洪金泉 Student: Jin-Chyuan Hung
指導教授:吳財福 博士 Advisor: Tsai-Fu Wu, Ph. D.
國立中正大學工學院 電機工程研究所
博士論文
A Dissertation Submitted to Institute of Electrical Engineering
College of Engineering National Chung Cheng University
in Partial Fulfillment of the Requirements for the Degree of
Doctor of Philosophy in Electrical Engineering
January 2005
Chiayi, Taiwan, Republic of China
ABSTRACT
Due to their simplicity and low steady-state component stress, pulse width modulated
(PWM) converters are broadly used in various power-conversion applications. However, they
have some drawbacks, such as high stress and high loss at switching transition, which will
limit their operation at high frequency. Soft-switching methods are thus used to reduce the
stress and loss.
A family of soft-switching cells (SSCs) for non-isolated and isolated PWM converters is introduced. These cells are derived from the quasi-square-wave converters (QSWCs), in which zero-voltage switching is an inherent feature. A selected SSC and a hard-switching PWM converter are combined by the synthesis process achieving that the PWM converter maintains the power process while the SSC performs the active-clamp function. The PWM converter with the SSC, clamping action and soft-switching feature in both main and auxiliary switches can be achieved. In this dissertation, synthesis process is proposed to unify some of the published soft-switching PWM converters. Based on the proposed synthesis process, families of new converter topologies can be systematically generated.
By introducing SSCs to the conventional single-stage power factor corrector (PFCs), the soft-switching features can be achieved and the energy trapped in the leakage inductor can be also recovered. For reducing input current ripple, two interleaving methods are proposed. Additionally, input power factor and total harmonics distortion of the PFCs with SSCs can be further improved by using an asymmetrical PWM manner.
By introducing SSCs to the coupled-inductor converters and push-pull converters, the
soft-switching features can be achieved and the energy trapped in leakage inductor can be also
recovered. Experimental results have shown that surge voltage can be suppressed effectively.
With the coupled inductors, active switches in the converters can sustain proper duty cycles
while operated with high step-up and/or high step-down voltage ratio, reducing component
stress significantly. Thus, the conversion efficiency of the converters is improved significantly.
In the push-pull converter, SSCs are used to eliminate potential flux imbalance existing in the
conventional push-pull converter which makes the converter more viable. In addition, all of
the proposed converters can be regulated with an asymmetrical PWM control, reducing cost and complexity.
Finally, based on the operational principles, detailed analysis, design procedures,
implementations and discussions of soft-switching PWM converters are presented. The
measured results have verified the feasibility of the discussed soft-switching converters.
LINK
http://www.mediafire.com/view/?lhjl4hr44grhtnj
Soft-Switching Cells
研 究 生:洪金泉 Student: Jin-Chyuan Hung
指導教授:吳財福 博士 Advisor: Tsai-Fu Wu, Ph. D.
國立中正大學工學院 電機工程研究所
博士論文
A Dissertation Submitted to Institute of Electrical Engineering
College of Engineering National Chung Cheng University
in Partial Fulfillment of the Requirements for the Degree of
Doctor of Philosophy in Electrical Engineering
January 2005
Chiayi, Taiwan, Republic of China
ABSTRACT
Due to their simplicity and low steady-state component stress, pulse width modulated
(PWM) converters are broadly used in various power-conversion applications. However, they
have some drawbacks, such as high stress and high loss at switching transition, which will
limit their operation at high frequency. Soft-switching methods are thus used to reduce the
stress and loss.
A family of soft-switching cells (SSCs) for non-isolated and isolated PWM converters is introduced. These cells are derived from the quasi-square-wave converters (QSWCs), in which zero-voltage switching is an inherent feature. A selected SSC and a hard-switching PWM converter are combined by the synthesis process achieving that the PWM converter maintains the power process while the SSC performs the active-clamp function. The PWM converter with the SSC, clamping action and soft-switching feature in both main and auxiliary switches can be achieved. In this dissertation, synthesis process is proposed to unify some of the published soft-switching PWM converters. Based on the proposed synthesis process, families of new converter topologies can be systematically generated.
By introducing SSCs to the conventional single-stage power factor corrector (PFCs), the soft-switching features can be achieved and the energy trapped in the leakage inductor can be also recovered. For reducing input current ripple, two interleaving methods are proposed. Additionally, input power factor and total harmonics distortion of the PFCs with SSCs can be further improved by using an asymmetrical PWM manner.
By introducing SSCs to the coupled-inductor converters and push-pull converters, the
soft-switching features can be achieved and the energy trapped in leakage inductor can be also
recovered. Experimental results have shown that surge voltage can be suppressed effectively.
With the coupled inductors, active switches in the converters can sustain proper duty cycles
while operated with high step-up and/or high step-down voltage ratio, reducing component
stress significantly. Thus, the conversion efficiency of the converters is improved significantly.
In the push-pull converter, SSCs are used to eliminate potential flux imbalance existing in the
conventional push-pull converter which makes the converter more viable. In addition, all of
the proposed converters can be regulated with an asymmetrical PWM control, reducing cost and complexity.
Finally, based on the operational principles, detailed analysis, design procedures,
implementations and discussions of soft-switching PWM converters are presented. The
measured results have verified the feasibility of the discussed soft-switching converters.
LINK
http://www.mediafire.com/view/?lhjl4hr44grhtnj
IMPLEMENTATION OF THREE-PHASE FED DC POWER SUPPLY SYSTEM WITH HIGH POWER FACTOR CHUNG YUAN CHRISTIAN UNIVERSITY
power factor is proposed for high power applications. The studied power
supply system consists with a three-phase three-switch power factor
corrector (PFC) and a phase-shifted zero-voltage-transition full-bridge
DC/DC converter with current doubler rectification. High power factor
input can be achieved by the adopted PFC circuit with a simple
configuration. The phase-shifted operation of the full-bridge DC/DC
converter provides the zero-voltage-switching (ZVS) features for the
bridge switches to reduce the switching losses effectively. The current doubler rectification reduces significantly the secondary rectification losses. Therefore, high efficiency can be also accomplished. The detailed operating principle and design consideration of this power supply system are analyzed and described. A 1.1kW 55V/20A laboratory prototype was implemented and tested. The experimental waveforms verify the feasibility of the proposed design. The implemented power supply system exhibits optimum performances such as high power factor, high efficiency, simple configuration and high reliability.
LINK THESIS
http://www.mediafire.com/view/?sf7319xgbi4q0o9
segunda-feira, 5 de novembro de 2012
Automatic Test System for Type Tests of the Uninterruptible Power Supply
Aalto university
school of electrical engineering HELSINKI FINLAND
Abstract of the master's thesis
Author: Esa Nummijoki Title: Automatic Test System for Type Tests of the Uninterruptible Power Supply Date: 27.3.2012 Language: English
Number of pages:10+59 Department of Electrical Engineering Professorship: Industrial Electronics Code: S-81
Supervisor: Prof. Seppo J. Ovaska Instructor: M.Sc. (Tech.) Risto Karola
Testing is an essential part of product development. In UPS product development, di erent tests are made every day. Testing requires large variety of measurement instruments and other equipment such as large load systems and di erent kind of test con gurations. Signi cant number of performed tests are based on the UPS type tests de ned in the IEC-62040 standard. Testing consumes a lot of time and that way also resources. To solve this problem, an automatic test system for type tests is considered. The aim of this thesis was to clarify the need for the automatic test system, and clarify requirements needed to realize it. The work was done by reviewing the type tests and di erent parts of an automatic test system. In addition, an experimentation was made, resulting a prototype. The prototype is able to automatically perform an indicative e ciency test for the UPS. Furthermore, a possibility to automate the most complex type test, a dynamic output performance test, was examined. This examination resulted a description of the test process and LabVIEW programs, supporting the execution of the test. However, the conclusion was that it is not sensible to automate the test, due to the fact that it is not often performed and automating the test requires a lot of time and resources. The review and the experimentation proved that realization of an automatic test system, able to perform all the type tests, requires large amount of time and resources. Due to this, the automatic test system for type tests is not the best solution to reduce the time and resources consumed by testing.
LINK FULL THESIS
http://www.mediafire.com/view/?g4pagyhlpoeqwh5
Abstract of the master's thesis
Author: Esa Nummijoki Title: Automatic Test System for Type Tests of the Uninterruptible Power Supply Date: 27.3.2012 Language: English
Number of pages:10+59 Department of Electrical Engineering Professorship: Industrial Electronics Code: S-81
Supervisor: Prof. Seppo J. Ovaska Instructor: M.Sc. (Tech.) Risto Karola
Testing is an essential part of product development. In UPS product development, di erent tests are made every day. Testing requires large variety of measurement instruments and other equipment such as large load systems and di erent kind of test con gurations. Signi cant number of performed tests are based on the UPS type tests de ned in the IEC-62040 standard. Testing consumes a lot of time and that way also resources. To solve this problem, an automatic test system for type tests is considered. The aim of this thesis was to clarify the need for the automatic test system, and clarify requirements needed to realize it. The work was done by reviewing the type tests and di erent parts of an automatic test system. In addition, an experimentation was made, resulting a prototype. The prototype is able to automatically perform an indicative e ciency test for the UPS. Furthermore, a possibility to automate the most complex type test, a dynamic output performance test, was examined. This examination resulted a description of the test process and LabVIEW programs, supporting the execution of the test. However, the conclusion was that it is not sensible to automate the test, due to the fact that it is not often performed and automating the test requires a lot of time and resources. The review and the experimentation proved that realization of an automatic test system, able to perform all the type tests, requires large amount of time and resources. Due to this, the automatic test system for type tests is not the best solution to reduce the time and resources consumed by testing.
LINK FULL THESIS
http://www.mediafire.com/view/?g4pagyhlpoeqwh5
domingo, 4 de novembro de 2012
Space Vector PWM Control for 3kW Brushless Motor Driver Design and Application for Novel Parallel Hybrid Electric Vehicles
ABSTRACT
In recent years, owing to the environmental protection concept has risen and
global warming, it is important to reduce the environmental pollution. If the merits
of both internal combustion engine and permanent magnet synchronous motor
(PMSM) can be integrated to become a hybrid electric vehicle, it must have
ultra-low pollution and energy-saving but still keeping high performance.
For this reason, the central purpose of this thesis is to develop a novel parallel
hybrid electric vehicle system driver and controller. Electronic motor control
systems used by extremely versatile digital signal processor (DSP). The important
space vector pulse-width-modulation (SVPWM) technology is applied to the PMSM
control to provide more efficiency of the hybrid electric vehicle. The SVPWM
technology is also guarantees the system to be stable with better performance.
Subsequently, by way of experiment results have proved the SVPWM technology
provides more and more performance of the PMSM and the SVPWM technology
have been applied in hybrid electric vehicle with high efficiency.
Finally, a prototype of the hybrid electric heavy-duty motorcycle has been
established and it has been exhibit on the “Taipei international automobile
electronics show” at the Taipei world trade center in 2007.
LINK
http://www.mediafire.com/view/?49glo7f3rm3rzij
In recent years, owing to the environmental protection concept has risen and
global warming, it is important to reduce the environmental pollution. If the merits
of both internal combustion engine and permanent magnet synchronous motor
(PMSM) can be integrated to become a hybrid electric vehicle, it must have
ultra-low pollution and energy-saving but still keeping high performance.
For this reason, the central purpose of this thesis is to develop a novel parallel
hybrid electric vehicle system driver and controller. Electronic motor control
systems used by extremely versatile digital signal processor (DSP). The important
space vector pulse-width-modulation (SVPWM) technology is applied to the PMSM
control to provide more efficiency of the hybrid electric vehicle. The SVPWM
technology is also guarantees the system to be stable with better performance.
Subsequently, by way of experiment results have proved the SVPWM technology
provides more and more performance of the PMSM and the SVPWM technology
have been applied in hybrid electric vehicle with high efficiency.
Finally, a prototype of the hybrid electric heavy-duty motorcycle has been
established and it has been exhibit on the “Taipei international automobile
electronics show” at the Taipei world trade center in 2007.
LINK
http://www.mediafire.com/view/?49glo7f3rm3rzij
Assinar:
Postagens (Atom)