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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https://www.mediafire.com/?fi52di4p3nn8bx5

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/

ECPE Young Engineer Award at PCIM Europe 2014

The winner of the Young Engineers Award 2014 sponsored by ECPE is Vinoth Kumar Sundaramoorthy. Dr. Sundaramoorthy is working as a Scientist at Corporate Research Center of ABB Switzerland Ltd, Switzerland since August 2008. The title of his Paper is 'Simultaneous Online Estimation of Junction Temperature and Current of IGBTs Using Emitter-Auxiliary Emitter Parasitic Inductance'.
LINK
http://www.ecpe.org/awards/ecpe-young-engineer-awardat-pcim-europe/

New Power Semiconductor Devices of JCS “Proton-Electrotex” Production

New Power Semiconductor Devices of JCS “Proton-Electrotex” Production

Yury Loktaev
Alexander Stavtsev/ "Proton-Electrotex", Technical Director
Alexey Surma/"Proton-Electrotex",Head of Research and Development Center
Anatoly Chernikov/"Proton-Electrotex", Deputy Technical Director for New Technology

JSC "Proton-Electritex" is one of the leading Russian companies in terms of development and production of high-power semiconductor devices: diodes, thyristors, modules on their base, heat-sinks.
The released production covers practically all range of power semiconductor thyristors and diodes with voltage from 100 to 6500 V and with current from 100 to 3000 A. Thyristors and diodes are produced of disk and stud constructional type. Along with thyristors and diodes which are supposed to operate under industrial frequency our company also produces fast and pulse-frequency thyristors, fast-recovery diodes as well as diodes with soft characteristic of reverse recovery.
A wide nomenclature of modules is also prodused on the base of thyristor and diode elements in different circuit configurations in full press-pack construction with isolated basement. Modules are produced under voltage from 100 to 1250 A.
The main tendencies of new equipment development can be characterized as following.
LINK1
http://proton-electrotex.com/files/project_52/08_New_Power_Semiconductor_Devices_eng.pdf

Iluminação de emergência Indústria e Mineração KOLFF KC-2559 FP

 

MAIORES INFORMAÇOES SOBRE OS PRODUTOS KOLFF NO WEBSITE:
http://www.kolff.com.br

Design and development of a battery cell voltage monitoring system. Master’s Thesis Nick Prinsloo Department of Electrical Engineering Cape Peninsula University of Technology

Design and development of a battery cell voltage monitoring system.

Master’s Thesis
Nick Prinsloo
Department of Electrical Engineering
Cape Peninsula University of Technology

A Thesis for
The Department of Electrical Engineering in fulfilment of the requirements for the
Magister Technologiae degree in electrical engineering,
at the Cape Peninsula University of Technology.

Abstract
The purpose of this thesis was to design and develop a measurement system that would allow accurate measurement of individual cell voltages in a series cell stack. The system was initially proposed to be used in conjunction with an active cell balancer. This would allow for the efficient equalising of cells as well as provide detailed information on the cell stack and how the stack operates over time. Having a system that measures voltages accurately, with which the active cell balancer can be controlled would allow for peak cell lifetime and performance. Current battery management systems are large, complex and inefficient and a new way of battery management had to be investigated. To accurately measure individual cells in a series stack, the high common mode voltage must be negated. Different techniques that are currently used to create galvanic isolation were reviewed; circuits were designed and were simulated to find the most suitable design. The traditional methods used to create galvanic isolation did not provide adequate results. The methods were too inefficient and not accurate enough to be used. The methods that had the required accuracy were too complicated to connect in a useable system.
FULL THESIS
https://www.mediafire.com/?3ot760o3mv8mm9z