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.
DOWNLOAD
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

PRECISE ANALYSIS OF IRON LOSS DISTRIBUTION IN ELECTRIC MACHINES USING FINITE ELEMENT METHOD INCORPORATED WITH MODELING ACCURACY IMPROVED VECTOR HYSTERESIS MODEL DEPARTAMENT OF ELECTRICAL ENGINEERING GRADUATE SCHOOL CHUNGBUK NATIONAL UNIVERSITY

 

FULL PAPER LINK
https://www.mediafire.com/?8q0mdcopz6m0v0g

Reliability Improvement of H-Bridge Multi-level Inverter for Medium-Voltage and High-Power Induction Motor Drives Young-Min Park, Kwang-Hwan Lee, and Se-Hyun Lee

Power Electronics Building Blocks PEBB  Power Cell

Reliability Improvement of H-Bridge Multi-level Inverter for Medium-Voltage and High-Power Induction Motor Drives Young-Min Park, Kwang-Hwan Lee, and Se-Hyun Lee Abstract - This paper proposes the reliability improvement of H-Bridge Multi-level (HBM) inverter. This reliability can be implemented through modularization of power circuit, distribution of controller, duplication of controller and communication, and continuous operation method in case of power cell failure for driving medium-voltage & high-power induction motor. It is shown that the modularization and expansion characteristics of the HBM inverter are improved since the individual inverter modules operate more independently when using the proposed concept. Also the fault tolerance is increased by using power cell bypass. The proposed design and control methods are described in detail and the validity of the proposed system is verified experimentally in various industrial fields.
Paper number: TKPE-2014-19-2-1 Print ISSN: 1229-2214 Online ISSN: 2288-6281 ✝ Corresponding author: pym@hhi.co.kr, Power Conversion Research Department, Hyundai Heavy Industries Co., LTD. Tel: +82-31-289-5135 Fax: +82-31-289-5150 1 Power Conversion Research Department, Hyundai Heavy Industries Co., LTD. 2 Power Conversion Research Department, Hyundai Heavy Industries Co., LTD. Manuscript received Sep. 23, 2013; accepted Nov. 25, 2013 ─ 본 논문은 2013년 전력전자학술대회 우수추천논문임
LINK
http://www.koreascience.or.kr/search/articlepdf_ocean.jsp?url=http://ocean.kisti.re.kr/downfile/volume/kipe/JRJJC3/2014/v19n2/JRJJC3_2014_v19n2_99.pdf

Comparative Analysis of Power Losses for Three-Level T-Type and NPC - Payam Alemi, and Dong-Choon Lee - Korean Institute of Power Electronics

 

 



 

Abstract - In this paper, an analysis of power losses for the three-level T-type and neutral-point clamped (NPC) PWM inverters is presented, in which the conduction and switching losses of semiconductor devices of the inverters are taken into account. In the inverter operation, the conduction loss depends on the modulation index (MI) and power factor (PF), whereas the switching loss depends on the switching frequency. Power losses for the T-type and NPC inverters are analyzed and calculated at the different operating points of MI, PF and the switching frequency, in which the four different models of semiconductor devices are adopted. In the case of lower MI, the NPC-type is more efficient than the T-type, and vice versa. The validity of the power loss analysis has been verified by the simulation results.
LINK
http://www.koreascience.or.kr/search/articlepdf_ocean.jsp?url=http://ocean.kisti.re.kr/downfile/volume/kipe/JRJJC3/2014/v19n2/JRJJC3_2014_v19n2_173.pdf

Analysis of Leakage Inductance for Toroidal Type Flyback Transformer Park, Chang-Soo ; Kang, Byeong-Geuk ; Shin, Kyoung-Gu ; Chung, Se-Kyo Dept. of Control and Instrumentation Eng., Gyeongsang

 

Abstract - This paper presents an analysis of a leakage inductance for a toroidal type flyback transformer. The equation to calculate the leakage inductance is derived using the MMF diagram of the transformer. The analysis for the different types of the cores and winding structures is also provided using the FEM simulation. The winding structures minimizing the leakage inductance are finally discussed from the simulation and experimental results.

LINK1
http://www.koreascience.or.kr/search/articlepdf_ocean.jsp?url=http://ocean.kisti.re.kr/downfile/volume/kipe/JRJJC3/2014/v19n2/JRJJC3_2014_v19n2_164.pdf

Method to Prevent the Malfunction Caused by the Transformer Magnetizing Inrush Current using IEC 61850-based IEDs and Dynamic Performance Test using RTDS Test-bed - Kang, Hae-Gweon

Abstract – The digital substations are being built based on the IEC 61850 network. The cooperation and protection of power system are becoming more intelligent and reliable in the environment of digital substation. This paper proposes a novel method to prevent the malfunction caused by the Transformer Magnetizing Inrush Current(TMIC) using the IEC 61850 based data sharing between the IEDs. To protect a main transformer, the current differential protection(87T) and over-current protection(50/51) are used generally.
LINK
http://www.koreascience.or.kr/search/articlepdf_ocean.jsp?url=http://ocean.kisti.re.kr/downfile/volume/kiee/E1EEFQ/2014/v9n3/E1EEFQ_2014_v9n3_1104.pdf

BIRNS Emergency Light Fixture-LED Seismic Testing

His video shows BIRNS Emergency Light Fixture-LEDs (ELF-LEDs) during IEEE-344 seismic qualification testing at the National Technical Systems facility. This demanding test sequence uses a tri-axial acceleration table delivering the equivalent of a seismic event at 10Gs of force in the x, y and z axes.

BIRNS ELF-LEDs are advanced, seismically qualified nuclear grade lighting systems that provide 24-40 hours of standby illumination in the event of loss of AC power, which is 3 to 5 times longer than required by the NRC. These rugged, CE marked, RoHS compliant systems have a lamp life of 50,000 hours, and an 11 W power draw.

http://www.birns.com/emergency-light-fixture-led.html

PLL FOR SINGLE PHASE GRID CONNECTED INVERTERS Power Electronics Dept., Technical University- Sofia, Bulgaria

PLL FOR SINGLE PHASE GRID CONNECTED INVERTERS
Mihail Antchev1, Ivailo Pandiev, Mariya Petkova, Eltimir Stoimenov, Angelina Tomova,Hristo Antchev
(Power Electronics Dept., Technical University- Sofia, Bulgaria)
(Electronic Engineering Dept., Technical University- Sofia, Bulgaria)
(R&D Sector, Technical University- Sofia, Bulgaria)

FULL PAPER
https://www.mediafire.com/?b7ow33oet047hk3
 

A Comparative Analysis of Multiloop Voltage Regulation Strategies for Single and Three-Phase UPS Systems Poh Chiang Loh, Michael John Newman,

Abstract—Most of the many reported control algorithms for uninterruptible power supplies (UPSs) use either filter inductor or filter capacitor currents as feedback variables to regulate the output voltage. This paper explores the fundamental performance issues associated with the use of these quantities as feedback variables, with a view to determining their contribution to the transient system response and output harmonic compensation in any particular situation. A proportional plus resonant (P+resonant) compensator is then added into the outer voltage regulation loop to achieve zero steady error, to develop a high performance UPS control algorithm, which is applicable to both single-phase and three-phase systems. Theory, simulation, and experimental results are presented in the paper.
FULL PAPER
https://www.mediafire.com/?vjjvhvmmpfmarsa

Annual International Microelectronics Olympiad of Armenia

Synopsys Armenia is the general organizer of the annual Armenian Microelectronics Olympiad, reflecting the growing development of microelectronics design in Armenia. The competition spotlights Armenia’s brightest and most talented young engineers under the age of 30. Goals of the Armenian Microelectronics Olympiad: Stimulate further development of microelectronics in Armenia and in the participant countries Recognize and inspire young, talented engineers Increase interest in microelectronics among young specialists Understand the level of knowledge in the field of microelectronics among young specialists in participating countries in order to make necessary adjustments to educational programs Create a community of young specialists involved in microelectronics The topics of the Olympiad: Digital IC Design and Test Analog and Mixed Signal IC Design and Test Semiconductor Devices and Technology Mathematical and Algorithmic Issues of EDA All participants of the Armenian Microelectronics Olympiad receive participation certificates. OLYMPIAD TESTS AND PROBLEMS EIGHTH ARMENIAN MICROELECTRONICS OLYMPIAD BROCHURE

WEBSITE ORIGINAL
http://www.synopsys.com/Company/Locations/Armenia/EducationalPrograms

/MicroelectronicsOlympiad/Pages/default.aspx#top

LINK DOWNLOAD OLYMPIAD TEST AND PROBLEMS
http://www.synopsys.com/Company/Locations/Armenia/EducationalPrograms/MicroelectronicsOlympiad/Documents/8thOlympiadTestsandProblems.pdf

Dual Mode PWM/Linear BuckConverter by Sensinga Load Current

Dual Mode PWM/Linear BuckConverter by Sensing a Load Current
 Kyung-hwan Kim
Department of Electronics and Electrical Engineering Graduate School Dankook University ABSTRACT
Recently, the importance for power management IC(PMIC) is emphasized as battery-powered portable electronics such as smartphone are commonly used.In addition,research and development on high efficiency isessential to maximize the use of portable devices that are preferred various functions than in the past.PMIC for high efficiency usually change drastically from Linear regulators to Switching regulators. But the switching regulators have disadvantage of low efficiency compared with linear regulatorat light load conditions. Therefore,this paper is presented the using of linear regulator to increase efficiency at light load conditions and the using of switching regulator at heavy load conditions.

Modeling and design of hybrid power filters: contributions to the performance analysis in distorted voltage grid - Tiago Davi Curi Busarello

 

Title	Modeling and design of hybrid power filters: contributions to the performance analysis in distorted voltage grid (written in Portuguese)
Author	Tiago Davi Curi Busarello
Year	2013
Files	Master Dissertation. Dissertação de Mestrado Tiago Davi Curi Busarello.pdf