Electric Machines Por D. P. Kothari,I. J. Nagrath

Análise da Resposta Dielétrica com DIRANA

Métodos de resposta dielétrica permitem a análise direta da isolação sólida de transformadores. Eles também podem ser utilizados para avaliação de buchas e das propriedades da isolação de motores, geradores, e cabos com isolação de papel impregnado em óleo.

Multi-physics Analysis for Temperature Rise Prediction of Power Transformer

 

Multi-physics Analysis for Temperature Rise Prediction of Power Transformer Hyun-Mo Ahn*, Joong-Kyoung Kim**, Yeon-Ho Oh***, Ki-Dong Song***and Sung-Chin Hahn

Abstract – In this paper, a method for multi-physics analysis of the temperature-dependent properties of an oil-immersed transformer is discussed. To couple thermal fields with electromagnetic and fluid fields, an algorithm employing a user defined function (UDF) is proposed. Using electromagnetic analysis, electric power loss dependent on temperature rise is calculated; these are used as input data for multi-physics analysis in order to predict the temperature rise. A heat transfer coefficient is applied only at the outermost boundary between transformer and the atmosphere in order to reduce the analysis region. To verify the validity of the proposed method, the predicted temperature rises in high-voltage (HV) and low-voltage (LV) windings and radiators were compared with the experimental values.
† Corresponding Author: Dept. of Electrical Engineering, Dong-A University, Korea .(schahn@dau.ac.kr)
* Dept. of Electrical Engineering, Dong-A University, Korea. (hmahn @donga.ac.kr)
** R&D Center, Power & Industrial System Performance Group, HYOSUNG Corporation, Korea .(jkkim1976@hyosung.com)
*** Power Apparatus Research Center, HVDC Research Division, Korea Electrotechnology Research Institute, Korea. (yhoh@keri. re.kr)
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http://www.koreascience.or.kr/search/articlepdf_ocean.jsp?url=http://ocean.kisti.re.kr/downfile/volume/kiee/E1EEFQ/2014/v9n1/E1EEFQ_2014_v9n1_114.pdf

Integrated Operation of Power Conversion Module for DC Distribution System HEE-JUN LEE College of Information and Communication Eng. Sungkyunkwan University

 

Abstract - It is DC power that Output of renewable energy being recently developed and researched. Also, demand of DC power will expect to proliferate due to increase of digital load. Thus, DC distribution system providing high quality of power and reliability has emerged as a new distribution system. If the conventional distribution systems are substituted by proposed DC distribution system, the output of renewable energy can be connected with distribution systems under minimum power conversion. Therefore, in the event of connection with DC load, it can construct an efficient distribution system. In this paper, the integrated parallel operation of power conversion module for DC distribution system is proposed. Also, this paper proposed modularization of power conversion devices for DC distribution system and power control for parallel operation of large capacity system. DC distribution system consists of three power conversion modules such as AC/DC power conversion module 2 set, ESS module 1 set. DC distribution system controls suitable operation depending on the status of the DC power distribution system and load. Integrated operation of these systems is verified by simulation and experiment results.

Integrated Operation of Power Conversion Module for DC Distribution System Lee, Hee-Jun ; Shin, Soo-Choel ; Hong, Suk-Jin ; Won, Chung-Yuen ; The Transactions of the Korean Institute of Power Electronics, volume 19, issue 3, 2014, Pages 240-248

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Power Quality Improvement by Using Multipulse AC-DC Converters for Varying Loads B.Suresh Kumar International Journal of Scientific Engineering and Technology 2014

International Journal of Scientific Engineering and Technology (ISSN : 2277-1581) Volume No.3 Issue No.2, pp : 78 - 84 1 Feb 2014 Power Quality Improvement by Using Multipulse AC-DC Converters for Varying Loads B.Suresh Kumar Asst.Professor,EEE dept,CBIT-Hyderabad
FULL PAPER
http://ijset.com/ijset/publication/v3s2/IJSET_2014_201.pdf

Multipulse AC–DC Converters for Improving Power Quality: A Review Bhim Singh,Sanjay Gairola

Bhim Singh, Senior Member, IEEE, Sanjay Gairola, Brij N. Singh, Member, IEEE, Ambrish Chandra, Senior Member, IEEE, and Kamal Al-Haddad, Fellow, IEEE
Abstract—Three-phase multipulse ac–dc converters (MPC) are developed for improving power quality to reduce harmonics in ac mains and ripples in dc output. This paper deals with the multipulse ac–dc converter configurations, state of art, their performance, power quality aspects, components selection considerations, latest trends, future developments, and potential applications. It is targeted to provide broad perspective on multipulse converter technology to the researchers, engineers, and designers dealing with them. A classified list of more than 250 research publications on the subject is also given for quick reference.

Ensaio Retificador trifásico Nominal ENG. LUIZ DANIEL SANTOS BEZERRA INSTITUTO FEDERAL DE EDUCAÇÃO, CIÊNCIA E TECNOLOGIA DO CEARÁ BRASIL

Automatic voltage regulator based on series voltage compensation with ac chopper C.-Y. Park1 J.-M. Kwon2 B.-H. Kwon Department of Electronics and Electrical Engineering, Pohang University of Science and Technology

Automatic voltage regulator based on series voltage compensation with ac chopper
C.-Y. Park1 J.-M. Kwon2 B.-H. Kwon1 1
Department of Electronics and Electrical Engineering, Pohang University of Science and Technology 2Department of Electrical Engineering, Hanbat National University, Daejeon, Republic of Korea E-mail: jmkwon@hanbat.ac.kr
Abstract: This study proposes an automatic voltage regulator (AVR) based on series voltage compensation with an ac chopper. The proposed AVR is made up of a pulse-width-modulated (PWM) ac chopper and a transformer for series voltage compensation. In the ac chopper, the commutation problem is solved by switching patterns. The ac chopper provides direct ac–ac power conversion without energy storage elements, so the size and cost of the AVR are reduced. The ac chopper compensates for only the required voltage, so the switches have reduced ratings and stresses. Using bypass switches, the proposed AVR can compensate not only for the voltage sag but also for the voltage swell of the input voltage. Experimental results verify that the proposed AVR quickly compensates for the voltage sag and swell of the input voltage.

Advanced Control of Three-Phase Four-Wire Inverters using Feedback Linearization under Unbalanced and Nonlinear Load Conditions Vo, Nguyen Qui Tu ; Lee, Dong-Choon ; Dept. of Electrical Eng., Yeungnam University KOREA -AUGUST 2013

Advanced Control of Three-Phase Four-Wire Inverters using Feedback
Linearization under Unbalanced and Nonlinear Load Conditions
Nguyen Qui Tu Vo1, and Dong-Choon Lee
Dept. of Electrical Eng., Yeungnam University-KOREA
 Journal title : The Transactions of the Korean Institute of Power Electronics
Volume 18, Issue ,4,  2013, pp.333-341
Publisher : The Korean Institute of Power Electronics
Abstract - In this paper, a feedback linearization control is proposed to regulate the output voltages of a three-phase four-wire inverter under the unbalanced and nonlinear load conditions. First, the nonlinear model of system including the output LC filters is derived in the d-q-0 synchronous reference frame. Then, the system is linearized by the multi-input multi-output feedback linearization. The tracking controllers for d-q-0-components of three-phase line-to-neutral load voltages are designed by linear control theory. The experimental results have shown that the proposed control method gives the good performance in response to the load conditions.
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Design of Robust Voltage Controller for Single-phase UPS Inverter Ku, Dae-Kwan ; Ji, Jun-Keun ; Cha, Guee-Soo ; Moon, Jun-Hee ; The Korean Institute of Power Electronics

A Study on the Wireless Parallel Operation of a Single-phase UPS

Journal title : The Transactions of the Korean Institute of Power Electronics
Volume 16, Issue ,4,  2011, pp.317-325
Publisher : The Korean Institute of Power Electronics
Design of Robust Voltage Controller for Single-phase UPS Inverter
Ku, Dae-Kwan ; Ji, Jun-Keun ; Cha, Guee-Soo ; Moon, Jun-Hee

Abstract
In this paper a robust voltage controller for a single-phase UPS inverter is newly presented. The voltage controller is designed using -based robust control scheme to simultaneously guarantee robust stability and robust tracking performance in the presence of load variations. Firstly the robust performance of the resulting controller is theoretically confirmed via -analysis. Then simulations and experiments for the single-phase inverter system with linear and nonlinear loads demonstrate feasibility of the proposed control method providing improved performance - good regulation and fast dynamic response.

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http://www.koreascience.or.kr/article/ArticleFullRecord.jsp?cn=JRJJC3_2011_v16n4_317

Programa de simulación de circuitos Micro-Cap. Versión 9, 10 [. Pdf-ZIP ] Autores: M.A.Amelina, S.A.Amelin. Libro de texto. Edición electrónica.

Programa de simulación de circuitos Micro-Cap. Versión 9, 10 [. Pdf-ZIP ] Autores: M.A.Amelina, S.A.Amelin. Libro de texto. Edición electrónica.
 Resumen editor: La técnica de modelado de dispositivos electrónicos utilizando el programa v.9.x Micro-Cap, firme v.10.x Spectrum Software (http://www.spectrum-soft.com/). Una breve digresión, que muestra las principales características del programa son ejemplos de modelado de diferentes clases de dispositivos electrónicos y, a continuación, se proporciona información básica detallada sobre el uso de Micro-Cap.
LINK
https://www.mediafire.com/?49cg83jqa99i2k7

Amantys describes their latest smart gate drivers at PCIM 2014

Carregador de Baterias sem Contacto para Alimentação de Equipamento Electrónico de Transmissão de Dados André Brandão Martins UNIVERSIDADE TECNICA DE LISBOA

Mestrado Integrado em Engenharia Electrotécnica e de Computadores UNIVERSIDADE TECNICA DE LISBOA Dissertação
Detalhes Aluno: André Brandão Martins (ist154485)
Título: Carregador de Baterias sem Contacto para Alimentação de Equipamento Electrónico de Transmissão de Dados
Resumo:
No âmbito desta dissertação pretende-se analisar e dimensionar um Conversor Ressonante Série CC-CC a utilizar como Carregador de Baterias sem Contacto para Equipamentos Electrónicos de Transmissão de Dados (6 VCC ? 1A). Algumas características do equipamento electrónico, em particular as suas dimensões, impõem uma distância máxima de 20mm entre os enrolamentos primário e o enrolamento secundário do transformador. De forma a definir o tipo de núcleo e o tipo de enrolamento a utilizar, foi realizada a caracterização experimental de diferentes transformadores com baixo acoplamento magnético. Considerando o baixo valor do factor de acoplamento magnético que este tipo de Sistemas de Transmissão de Energia apresenta, e o consequente impacto no rendimento, foi dimensionado e estudado um protótipo, através da simulação e teste de várias topologias de conversores e transformadores, a diversas distâncias, com o intuito de obter uma solução que apresentasse melhor desempenho. Projectou-se um conversor ressonante série e procedeu-se à simulação do seu funcionamento, utilizando diferentes parâmetros: impedância característica, afastamento entre primário e secundário e carga. Para validação dos modelos teóricos e de simulação construiu-se um inversor em meia-ponte com uma malha de compensação ressonante série, a operar à frequência de 100kHz, a partir do qual se obtiveram os resultados experimentais.

Publicação

Carregador de Baterias sem Contacto para Alimentação de Equipamento Electrónico de Transmissão de Dados, André Brandão Martins, 2011,

( Resumo alargado 361KB Tese 4,4MB)
Obra sujeita a Direitos de Autor

Understanding EMC Basics 2: Waveforms, Spectra, Coupling, Overview of E...

Modular DC/DC Converter for DC Distribution and Collection Networks THÈSE NO 5430 (2012) ÉCOLE POLYTECHNIQUE FÉDÉRALE DE LAUSANNE FACULTÉ DES SCIENCES ET TECHNIQUES DE L'INGÉNIEUR LABORATOIRE D'ÉLECTRONIQUE INDUSTRIELLE PROGRAMME DOCTORAL EN ENERGIE Suisse 2012 PAR Stephan Kenzelmann

Modular DC/DC Converter for DC Distribution and Collection Networks
THÈSE NO 5430 (2012) AUTHOR Stephan Kenzelmann
ÉCOLE POLYTECHNIQUE FÉDÉRALE DE LAUSANNE PRÉSENTÉE le 13 juillet 2012 À LA FACULTÉ DES SCIENCES ET TECHNIQUES DE L'INGÉNIEUR LABORATOIRE D'ÉLECTRONIQUE INDUSTRIELLE PROGRAMME DOCTORAL EN ENERGIE ÉCOLE POLYTECHNIQUE FÉDÉRALE DE LAUSANNE
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http://infoscience.epfl.ch/record/180231/files/EPFL_TH5430.pdf

PROJETO E OTIMIZAÇÃO DA COMPENSAÇÃO DE UM TRANSFORMADOR DE NÚCLEO SEPARADO USADO PARA RECARREGAR AS BATERIAS DE UM VEÍCULO SUBAQUÁTICO AUTÔNOMO UNIVERSIDADE FEDERAL DE JUIZ DE FORA,NUCLEO DE AUTOMAÇÃO E ELETRÔNICA DE POTENCIA

Projeto E Otimização Da Compensação De Um Transformador De Núcleo Separado Usado Para Recarregar As Baterias Um Veículo Subaquático Autônomo
Israel Filipe Lopes, Rodolfo Lacerda Valle, Pedro Gomes Barbosa, Leonardo De M. Honório, Nuno A. Cruz, Aníbal C. Matos

Resumo Este trabalho apresenta um estudo sobre o projeto e compensação de parâmetros de um transformador de núcleo separado (TNS) usado como circuito de interface de um sistema de transferência de energia elétrica para alimentar um veículo autônomo subaquático (AUV). O circuito de interface transfere energia sem contato elétrico para carregar a bateria de um AUV. Os valores das resistências e reatâncias do circuito equivalente do TNS são determinados experimentalmente a partir da medição da tensão, corrente e potência entrada obtidos com dois ensaios a vazio e um ensaio em curto circuito. Capacitores série e paralelo são conectados aos terminais de entrada e saída do transformador para compensar as indutâncias de dispersão e aumentar o fluxo de magnetização. Uma rotina matemática é usada para otimizar os valores das capacitâncias para aumentar a eficiência e a tensão de saída, induzida no enrolamento secundário do TNS, uma vez que o entreferro do transformador pode variar com a precisão do processo de docagem do AUV. Resultados experimentais são apresentados para validar as análises teóricas e demonstrar o comportamento do transformador para diferentes valores de entreferro, frequência de excitação e da carga.
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CONCEPTION OF MULTILEVEL INVERTER APPLIED TO UPS SYSTEM Lincoln Moura Oliveira, Levy Ferreira Costa, Deivid Marins, Sergio Daher, Fernando Luiz Marcelo Antunes GPEC DEPARTAMENTO ENGENHARIA ELETRICA UNIVERSIDADE FEDERAL DO CEARA BRASIL

Abstract This paper presents the grid connected mode of a 3 kVA single-phase uniterruptible power supply (UPS), with features of low frequency operation, high efficiency and unit power factor of the input. The input stage of the proposed UPS is composed by a power factor correction rectifier based on classical boost converter, which is used to supply the dc bus. The output stage is composed by a multilevel inverter, which is based on a low frequency full-bridge converter associate to a multiple winding transformer with one primary coil and several secondary coils. Each secondary coil is used to produces the partial alternating voltage and the series combination of the output coils are used to generating the complete output voltage. The theoretical analysis, design example, as well as experimental results of the proposed UPS system are presented in this paper.
 LINK
https://www.mediafire.com/?v6r1flm2r0r9n2p

CONTROLE DA POTÊNCIA GERADA EM MICRORREDES AUTÔNOMAS E ISOLADAS COM FONTES DE ENERGIA RENOVÁVEIS E SISTEMA DE ARMAZENAMENTO COM BANCOS DE BATERIAS

José Gomes de Matos, Luiz Antonio de Souza Ribeiro e Felipe Simões Freitas e Silva
Instituto de Energia Elétrica – Universidade Federal do Maranhão – IEE-UFMA-BRASIL
Avenida dos Portugueses, 1966, Bacanga, CEP 65.080-805 – São Luís - MA
E-mails: gomes@dee.ufma.br; luiz_ribeiro@dee.ufma.br; simoesfs@gmail.com

Resumo - Este trabalho apresenta uma nova estratégia para controlar a potência gerada por fontes de energia renováveis conectadas à microrredes autônomas e isoladas, que utilizam sistema de armazenamento a base de banco de baterias. O principal objetivo da estratégia de controle proposta é manter o balanço de energia dentro da microrrede para que a integridade dos bancos de baterias seja garantida, mesmo quando houver potencial para geração de mais energia do que a carga pode consumir e os bancos de baterias são capazes armazenar. Essa meta é alcançada controlando a quantidade de potência gerada dentro da microrrede, sem dissipar eventual excesso de energia gerada em cargas resistivas auxiliares e sem utilizar qualquer comunicação física entre os sistemas de controle dos conversores de potência envolvidos. A frequência elétrica da microrrede é utilizada para informar quanta potência cada fonte de energia pode gerar para que a tensão dos bancos de baterias seja mantida abaixo do seu valor máximo permitido. Um método de controle droop modificado é proposto para implementar esse tarefa.
 LINK
https://www.mediafire.com/?o38io6a4p4z6662

Electromagnetic Field Theory Episode 21 electromagnetic theory Beijing University of Posts and Telecommunications 电磁场理论 北京邮电大学 第21集 电磁场理论（二十一）全套高清

Electromagnetic Field Theory Episode 21 electromagnetic theory Beijing University of Posts and Telecommunications

SEMIKRON Innovation Award and SEMIKRON Young Engineer Award 2014

(from left to right) Prof. Leo Lorenz (ECPE), Benjamin Zeller, Dr. Johann Miniböck, Bettina Heidenreich-Martin (SEMIKRON Foundation) Bild-Quelle: Mesago PCIM GmbH/Thomas Geiger

Winner of the Semikron Innovation Award 2014 The SEMIKRON Foundation and the ECPE European Center for Power Electronics e.V. jointly honoured Prof. Dr. Johann Walter Kolar, Power Electronic Systems Laboratory, ETH Zurich, Switzerland and Dr. Johann Miniböck, M-PEC Power Electronics Consulting, Austria with the SEMIKRON Innovation Award 2014 at the PCIM 2014 for their outstanding innovation on ´Multiple-Interleaved Triangular-Current-Mode Converters´. Winner of the Semikron Young Engineer Award 2014 The SEMIKRON Young Engineer Award goes to Benjamin Zeller, Fujitsu Technology Solutions in Augsburg, Germany for his contributions to the development of a high-efficient and high volume 65W power supply on a PC mainboard.
LINK
http://www.ecpe.org/awards/semikron-innovation-awardsemikron-young-engineer-award/