CAD-Integrated CFD for use in electronics cooling

Low harmonic content three-phase-to-DC-conversion using AC-side switches and discontinuous conduction mode utor: Carlton, Dan Degree Doctor of Philosophy - PhD Program Electrical and Computer Engineering THE UNIVERSITY OF BRITISH COLUMBIA

					Arquivos deste item Arquivos Tamanho Formato Descrição   Visualização ubc_1999-38862X.pdf 9.051Mb Adobe Portable Document Format   Visualizar/Abrir

A new DSP controlled bi-directional DC/DC converter system for inverter/charger applications Swingler, Andrew Duncan Degree Doctor of Philosophy - PhD Program Electrical and Computer Engineering THE UNIVERSITY OF BRITISH COLUMBIA

Título:	A new DSP controlled bi-directional DC/DC converter system for inverter/charger applications
Autor:	Swingler, Andrew Duncan
Degree	Doctor of Philosophy - PhD
Program	Electrical and Computer Engineering
Copyright Date:	2003
URI:	http://hdl.handle.net/2429/16121

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OUTPUT VOLTAGE CONTROL OF A FOUR-LEG INVERTER BASED THREE-PHASE UPS BY MEANS OF STATIONARY FRAME RESONANT FILTER BANKS BY EYYUP DEMİRKUTLU

OUTPUT VOLTAGE CONTROL
OF A FOUR-LEG INVERTER BASED THREE-PHASE UPS
BY MEANS OF STATIONARY FRAME RESONANT FILTER BANKS
BY
EYYUP DEMİRKUTLU

A THESIS SUBMITTED TO
THE GRADUATE SCHOOL OF NATURAL AND APPLIED SCIENCES
OF
MIDDLE EAST TECHNICAL UNIVERSITY

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Design and Control of an Inverter for Photovoltaic Applications by Søren Bækhøj Kjær

Dissertation submitted to the Faculty of Engineering and Science at Aalborg University
in partial fulfillment of the requirements for the degree of Doctor of Philosophy (Ph.D.)
in Electrical Engineering.
The public defence took place on May 27, 2005. The assessment committee was:
• Professor Vassilios G. Agelidis, Murdoch University, Australia
• Professor Jorma Kyyrä, Helsinki University of Technology, Finland
• Associate Professor Remus Teodorescu, Aalborg University (Chairman)
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Modular Power Electronic Converters in the Power Range 1 to 10 kW by Pawel Klimczak Aalborg University, Denmark Institute of Energy Technology

Abstract
Thanks to CO2 emission reduction policies and increasing prices of fossil fuels a
significant growth in field of sustainable energy sources (SES) is being observed
during last decade. A government support and take-off projects in Europe and US
shall ensure an increasing trend in future too. Some of SES based plants , like
hydro-, geothermal-, biofuel-plants, use synchronous generators directly connected
to the grid. But some other SES technologies, like fuel cell or photovoltaic, require
a power electronic converter between the energy source and the load or the grid.
Work presented in this thesis concentrates on dc-dc non-isolated converters suitable
for high voltage gain applications, like uninterruptible power supply (UPS) and
some of sustainable energy sources. A special attention is on reduction of power
losses and efficiency improvements in non-isolated dc-dc step-up converters.
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Non-isolated Single Phase Uninterruptible Power Supply (UPS) System Muhammad Aamir and Hee-Jun Kim Dept. of Electronics, Electrical, Control, and Instrumentation Engineering, Hanyang University, Korea

Non-isolated Single Phase Uninterruptible Power Supply (UPS) System Muhammad Aamir and Hee-Jun Kim Dept. of Electronics, Electrical, Control, and Instrumentation Engineering, Hanyang University, Korea
Abstract-- In this paper, a high performance single phase
transformer-less online uninterruptable power supply (UPS)
is proposed. The use of the bidirectional buck-boost
converter with high conversion ratio not only reduces the
number of batteries but also ensures a transformer-less
system. The rectifier has capability of power factor
correction and provides regulated DC link voltage whereas
the inverter provides a regulated sinusoidal output voltage
to the load. In order to control the transient effect, efficient
control scheme is adopted in the system. The overall
efficiency of the system is improved with significant
reduction in size and weight of the system due to decrease
number of batteries. Qualitative analysis and experimental
results obtained with a 500VA prototype shows a normal
efficiency of over 94% and an input power factor of over 99%.
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Eaton's PSEC - Harmonics

METREL MI 2792 PowerQ4 Plus ANALIZADOR ENERGIA TRIFASICO

EEWeb Pulse - Volume 109 Interview with Steve Grodt – Marketing Manager at Chroma; NASA’s SpaceShop: Expressway for Ideas; The End of Moore’s Law?; VHDL101 – Part 5: Tick Tock, Processing Clocks; RTZ – Return to Zero Comic

issuu.com/eeweb/docs/volume_109_-_chroma

UPS ESTATICO PARTE1 Por Luís Tossi e Lincolm Menezes REVISTA OSETOR ELETRICO

http://www.osetoreletrico.com.br/web/documentos/fasciculos/Ed89_fasc_UPS_estatico_cap6.pdf

The J&P Transformer Book 12E

The J&P Transformer Book 12E

Design of Transformers Por Indrajit Dasgupta

An Overview on Amorphous Core Transformers Man Mohan Electrical Engineering Department

Abstract
In this paper, an amorphous core transformer is highlighted. Configuration of amorphous C-core and its magnetisation characteristic (B-H) are described. Factors affecting the design are also discussed as a comparison with a conventional transformer. It is concluded that, advantages with amorphous core transformers are - low core losses, low magnetising current, less zero sequence current, less noise, higher efficiency and longer life; however the disadvantages are higher inrush current, more harmonic problem, bigger size and higher initial cost. The problem of third harmonic may be eliminated by adopting zig-zag connection in place of star connection. Purpose of this article is to provide a knowledge base about amorphous core transformers, to students of transformer design, by discussing some necessary issues. __________________________________________________________________________________________ LINK
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Amorphous-Core Transformer with Copper Winding Versus Aluminium Winding-A Comparative Study

 

ABSTRACT
Amorphous core transformers are in developing stage; they are considered as energy efficient transformers. Cost of amorphous core transformer is about 20 to 30 per cent higher than that of a conventional transformer of same KVA rating. Among several parameters, cost of winding material is a parameter, on which cost of a transformer depends. In a transformer, the cost of winding material may be up to 28 per cent of overall cost of a transformer. Cost of a transformer may be reduced if aluminum winding is adopted in place of copper winding; aluminum is lighter in weight and cheaper in price, compared to copper winding. Here, a comparative study is presented for an amorphous core transformer with copper winding versus aluminum winding, in terms of cost efficiency and mechanical forces. It has been found that, if aluminum winding is adopted for 400KVA amorphous core transformer, the cost reduces, efficiency improves and mechanical forces.
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http://www.ejournalofscience.org/archive/vol2no4/vol2no4_4.pdf

UNIVERSIDADE FEDERAL DO RIO GRANDE DO SUL ESCOLA DE ENGENHARIA DEPARTAMENTO DE ENGENHARIA ELÉTRICA MÁRCIO MOURA DE MATTOS PROJETO DE DIPLOMAÇÃO ESTUDO DO FATOR K EM TRANSFORMADORES A SECO BRASIL

RESUMO Este trabalho tem por finalidade apresentar um estudo sobre harmônicas suas causas e suas conseqüências em instalações elétricas. Será realizado um estudo da decomposição dos sinais de energia elétrica através da decomposição da Séria de Fourier, a partir da qual serão mostrada e calculada as diferente ordens das harmônicas Será dada ênfase nas conseqüências dessas em transformadores a seco. Onde será calculado o Fator K em seus dois modos o modo da UL e o modo que é assumido por muito autores como sendo o Fator K normalizado. . Esse estudo está diretamente relacionado com a temperatura de funcionamento do transformador e sua vida útil. Para exemplificar o estudo será mostrada a constituição do transformador a seco fabricado pela empresa SIEMENS, que recebe o nome de GEAFOL.
ARTICULO COMPLETO
http://www.lume.ufrgs.br/bitstream/handle/10183/65619/000864745.pdf?sequence=1

“Cálculo das Perdas Técnicas dos Transformadores de Distribuição, Operando em Ambiente Não-Senoidal” Luciano Dos Santos UNESP UNIVERSIDADE ESTADUAL PAULISTA CAMPUS DE ILHA SOLTEIRA PROGRAMA DE PÓS-GRADUAÇÃO EM ENGENHARIA ELÉTRICA BRASIL

Dissertação submetida à Faculdade de Engenharia de Ilha Solteira – UNESP - como parte dos requisitos exigidos para a obtenção do título de Mestre em Engenharia Elétrica.
 RESUMO
 Este trabalho está direcionado à implementação de uma modelagem que venha possibilitar a
realização dos cálculos das perdas técnicas no cobre do transformador trifásico de distribuição
operando em condições não-senoidais, através da utilização do valor médio de Distorção
Harmônica Total de Corrente drenada por suas cargas. Essa implementação visa facilitar a
obtenção dos valores das perdas técnicas para múltiplas unidades transformadoras. Para atingir o
objetivo mencionado, realizou-se um ensaio em curto-circuito através de ensaios experimentais
aplicadas em uma unidade transformadora trifásica de distribuição com 15 kVA de capacidade. A
fonte trifásica de alimentação utilizada na atividade proporciona o ajuste de tensão e da
freqüência, possibilitando obter os valores de resistências CA dos enrolamentos do transformador
para diferentes ordens harmônicas. Com o propósito de validar esta nova proposta, foi realizada
uma análise confrontando-se os dados obtidos através da modelagem proposta neste trabalho e de
uma outra bastante difundida pela literatura atual. Os cálculos foram efetuados utilizando-se
dados de distorções harmônicas de correntes oriundas de medições de ramais de distribuição.
Através da comparação dos resultados obtidos é possível verificar a validade da modelagem proposta.
TESIS COMPLETA
http://www.feis.unesp.br/Home/departamentos/engenhariaeletrica/pos-graduacao/167-dissertacao_luciano_dos_santos.pdf

REDUCTION DES PERTES A VIDE DES TRANSFORMATEURS DE DISTRIBUTION PAR UTILISATION DE RUBANS AMORPHES by Malick MOUHAMAD

THESE DE DOCTORAT
DE L’ECOLE NORMALE SUPERIEURE DE CACHAN
Présentée par
Malick MOUHAMAD
pour obtenir le grade de
DOCTEUR DE L’ECOLE NORMALE SUPERIEURE DE CACHAN
Domaine :
ELECTRONIQUE – ELECTROTECHNIQUE – AUTOMATIQUE
REDUCTION DES PERTES A VIDE DES TRANSFORMATEURS DE DISTRIBUTION PAR UTILISATION DE RUBANS AMORPHES
Thèse présentée et soutenue à Cachan le 28/02/2012 
Abstract
This PhD dissertation deals with the application of amorphous ribbons in distribution transformer cores in order to reduce network losses.
The material is an alloy from iron, boron and silicon compounds. The first results on the material reveal a good physicochemical compatibility with tested transformer dielectric fluids. It should be noted these materials possess a far longer life than the transformer itself.
The potential for reducing losses from distribution transformers is considered as one element of EU and national strategies on energy efficiency. Losses generated through amorphous transformers are twice less than conventional ones.
Amorphous ribbon units represent a significant new advance in transformer technology and losses reduction. The investment, put to purchase the product, can be easily gained by the capitalisation of losses. The return can be achieved in 10 to 12 years, depending on the purchase price.
It is expected that a transformer will be subjected to a number of short-circuits during its service life, but sooner or later one such event will cause some slight winding movement, and the ability of the transformer to resist further short-circuits will then be severely reduced.
Amorphous metal distribution transformers (AMDT) is no exception and they should be able to resist electrodynamic forces during short-circuit test and match ERDF specifications. In fact, during SC, extreme electrodynamic forces cause the windings to deform and this shape deformity creates a lot of shear stress on amorphous cores which lead to break-up of some ribbons. The active part of an amorphous transformer should be strong enough to resist these stresses.
In fact, the behaviour of the core materials under short circuit currents depends especially on the know-how of manufacturers who can outline electrodynamic stress inside transformers. Concept design and processes have been improved in order to provide reliable devices but the task is not completely done yet.
Short-circuit withstand is one of the most important aspects which will approve this technology.
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HIGH PERFORMANCE CONTROL OF A THREEPHASE PWM RECTIFIER YIN BO NATIONAL UNIVERSITY OF SINGAPORE

HIGH PERFORMANCE CONTROL OF A THREEPHASE
PWM RECTIFIER
YIN BO
(M.Eng.， Wuhan University，China)
A THESIS SUBMITTED
FOR THE DEGREE OF DOCTOR OF PHILOSOPHY
DEPARMENT OF ELECTRICAL AND COMPUTER ENGINEERING
NATIONAL UNIVERSITY OF SINGAPORE
2008
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New Energy-efficient High-voltage DC-DC Power Conversion Technology by Wang Huai

New Energy-efficient High-voltage
DC-DC Power Conversion Technology
Submitted to
Department of Electronic Engineering
電子工程學系
in Partial Fulfillment of the Requirements
for the Degree of Doctor of Philosophy
哲學博士學位
by
Wang Huai
王懷
March 2012
二零
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