“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”

OBRIGADO DEUS PELA VIDA,PROTEGENOS E GUARDANOS DE TODO MAL


AUTOR DO BLOG ENG. ARMANDO CAVERO MIRANDA SAO PAULO BRASIL

sábado, 26 de dezembro de 2015

A Novel Single-Phase Cascaded Multilevel AC-AC Converter Without Commutation Problem Kim, Sang-hun Department of Electrical Engineering Graduate School, Kyungpook National University Daegu, Korea









Abstract)
 This paper presents a novel cascaded multilevel PWM ac-ac converter that can solve commutation problem. By cascading the single-phase PWM ac-ac converter that uses basic switching cell structure and coupled inductors, the proposed converter does not need to sense the voltage or current polarity for safe commutation. When many unit-cells are cascaded, the proposed converter has more output voltage levels and can obtain high ac output voltage by using low voltage rating switching devices. By applying phase-shifted PWM technique, the proposed converter can reduce output filter size significantly. A 2 kW prototype converter having four unit-cell structure is built and tested to verify the performance. *

LINK
http://www.mediafire.com/view/8p898ucoid8uf3b/CONVERTER_AC-AC-2015.pdf

quinta-feira, 24 de dezembro de 2015

A VOLTAGE SAG SUPPORTER UTILIZING A PWM-SWITCHED AUTOTRANSFORMER A Thesis Presented to The Academic Faculty by Dong-Myung Lee School of Electrical & Computer Engineering Georgia Institute of Technology Atlanta




INTRODUCTION
1.1 Background A power distribution system is similar to a vast network of rivers. It is important to remove any system faults so that the rest of the power distribution service is not interrupted or damaged. When a fault occurs somewhere in a power distribution system, the voltage is affected throughout the power system. Among various power quality problems, the majority of events are associated with either a voltage sag or a voltage swell, and they often cause serious power interruptions. A voltage sag condition implies that the voltage on one or more phases drops below the specified tolerance for a short period of time. A voltage swell condition occurs when the voltage of one or more phases rises above the specified tolerance for a short period of time. The causes of voltage sags and swells are associated with faults within the power distribution system. Users located a close distance to the fault experience voltage sags much greater in magnitude and duration than users located farther away, and as the power distribution system have power interruptions during a fault because of the effects of a voltage sag or voltage swell produced in the system by the fault. The objective of this research is to develop a novel voltage control scheme that can compensate for voltage sag and swell conditions in three-phase power systems.

LINK
ttp://www.mediafire.com/view/j1wv1l6fu2p57fb/ESTABILIZADOR_AC-KOREA-2015.pdf

sábado, 5 de dezembro de 2015

COBEP2015 FORTALEZA CEARA BRASIL TUTORIAL DR. CUK





Power Electronics: A New Beginning By Slobodan Ćuk, TESLAco
Power Electronics progress depends on the progress in its two constituent areas: System Technology and Power Management Technology, which had been traditionally developed in the past in companies specializing in either one or the other area of expertise. System Technology companies, or Power Supply companies relied heavily on the use of the components (switches, drive and control circuits) developed by Power Management companies.
The System Technology popularly known as converter topologies has changed very little in last 50 years and is, in fact, the key reason why the Power Electronics as whole has progressed much less despite the tremendous advances made by Power Management companies in developing the new switching devices with ever increasing switching devices power and speed improvements and high performance digital control circuits.
The conventional topologies are analyzed and the sources of their deficiencies are established. This, in turns, leads to the new switching methods and the corresponding novel switching converter topologies which are overcoming all these deficiencies. However, no incremental change will do, but a fresh new look is needed. Hence what is needed is: Power Electronics: A New Beginning!
Dr. Slobodan Ćuk
Dr. Ćuk received his bachelor degree from Belgrade University, Yugoslavia, 1970, MSEE degree from University of Santa Clara, USA 1974 and her Ph.D. from Caltech, California , USA, 1976.
Dr. Ćuk was the full-time Professor of Electrical Engineering at the California Institute of Technology until January 1, 2000 where he conducted research and taught courses in Power Electronics and Fundamentals of Energy Processing. During his 25 years at Caltech, more than 35 students obtained Ph.D. degree in Power Electronics under his guidance. More than dozen of his former students are Professors of Power Electronics in U.S. and abroad while others are leading researchers in the industry.
For the invention of Integrated Magnetics Dr. Ćuk obtained a 1991 Edward Longstreth Medal from Franklin Institute which was for the first time in its 100 years history awarded to researchers in Power Electronics. His publications include over 100 scientific papers in the Power Electronics field and a three-volume book on Switched-Mode Power Conversion.
Over a span of 20 years, Dr. Ćuk has taught a number of public and in-house courses in United States, Europe and Far East, which were attended by over 4,000 Power Electronics specialists. In 1979, Dr. Ćuk founded TESLAco. He holds over 20 patents in switching power conversion filed. Over dozen patents on Ćuk Optimum Power Conversion technology are pending or are currently in preparation.
Dr. Ćuk’s Inventions and Discoveries
1. Optimum Topology Converter, known as the ĆUKconverter (1974)
2. Coupled-Inductor and Integrated Magnetics method (1975)
3. State-space averaging method (1975)
4. TESLAconverter (2000)
5. Hybrid-switching and Storageless-Switching Method (2009)
6. New DC-DC and Bridgeless AC-DC converter topologies (2010):

quinta-feira, 12 de novembro de 2015

A study on Auto Transformer protective method for AC electric railway system.





A study on Auto Transformer protective method for AC electric railway system.

 Son, Dong-Shic Department of Railroad Engineering The Graduate School of Green Railroad Woosong University

An AC electric railway uses AT(auto transformer), BT(Booster Transformer), and direct power feeding system. Today, as a result of an increase in use of load current system, AT feeding system has became a mostly and widely used system due to its profitability in high and long-distance power feeding and inductive interference. AT is a core facility of the AC electric railway, a major public transportation, in AT traction power feeding system thus, the suspension of train operation due to the malfunction of AT feeding system would causes not only a high volume of civil petitions but also an interruption to the power supply to the train that could bring a second incident. In general, the power transformer protection is classified into electronic protection that includes differential protection (87T), over current protection (50/51), and earth fault protection (50/51N), and the mechanical protection such as buchholz relay, sudden pressure relay, winding temperature indicator, temperature indicator for insulation oil however, the failure in the operation of AT is protected only by an alarm signal controlled by substation using current and impedance relay. Therefore, to prevent the failure in mechanical protection, sectioning post(SP), sub-sectioning post(SSP), and parallel post(PP) needs to be protected by electronic protection as well as mechanical protection. In addition, accidents related to AT traction power supply system are divided into an outside (on railroad) accident mostly occurred due to traction line earth(T-R earth), feeding line earth(F-R earth), sectioning line earth(F-R earth), and short circuit(T-R short circuit) between feeding and sectioning linen, and an inside (at substation) accident mostly occurred due to earth and short circuit of AT winding furthermore, no matter what type of accident related to AT traction power supply system occurs it is protected by over current or impedance relay from substation Even though the AT related accidents could result in the discontinuation of rail service due to an inability to separate the feeder section, it is difficult to find whether the type of accident is outside or inside. As a result, it unnecessarily costs long time to deal with the accident because of unclearness of the cause.

segunda-feira, 9 de novembro de 2015

Network Analysis & Synthesis by Franklin F. Kuo


ESTUDIE INGENIERIA ELECTRONICA CON ESTE LIBRO ES UN GRANDE CLASICO
ENCONTRADO EN LA WEB CON ACCESO LIBRE EN LOS SIGUIENTES LINKS:
LINK ORIGINAL EN LA WEB
https://archive.org/details/NetworkAnalysisSynthesis
LINK DIRECTO PARA BAJAR EN FORMATO PDF
https://archive.org/download/NetworkAnalysisSynthesis/Kuo-NetworkAnalysisSynthesis.pdf

About the Internet Archive  https://archive.org/about/
The Internet Archive is a 501(c)(3) non-profit that was founded to build an Internet library. Its purposes include offering permanent access for researchers, historians, scholars, people with disabilities, and the general public to historical collections that exist in digital format.

Founded in 1996 and located in San Francisco, the Archive has been receiving data donations from Alexa Internet and others. In late 1999, the organization started to grow to include more well-rounded collections. Now the Internet Archive includes: texts, audio, moving images, and software as well as archived web pages in our collections, and provides specialized services for adaptive reading and information access for the blind and other persons with disabilities.

PROBLEMAS RESUELTOS ELECTROMAGNETISMO- LOPEZ R.






AGRADEÇO A COLABORAÇAO DO ENG, JORGE MIREZ DE LA UNI -PERU
LINK ORIGINAL
https://jmirezphysics.files.wordpress.com/2011/10/problemas_resueltos_de_electromagnetismo_2da_edicion_victoriano_lopez_rodriguez.pdf

domingo, 8 de novembro de 2015

CALCULO Y ANALISIS DE REGIMENES DE TRABAJO DE REDES ELECTRICAS -VENIKOV,ANISOVA,FOKIN-Расчеты и анализ режимов работы сетей -Веников В.А.,Фокин, Анисова,Федоров



LINK BOOK RUSSIAN VERSION
http://www.mediafire.com/view/u8jrakyr19ftol7/CALCULO_Y_ANALISIS_DE_REDES_ELECTRICAS-VENIKOV.pdf
Electrical network performance calculations and analysis / General editor V. A. Venikov [and others] ; translated from the Russian by O.B. Volodina. - Rev. from the 1974 Russian edition.
Moscow : Mir Publishers,

Anisimova N.D., Ezhkov V.V., Fedorov D.A., Fokin Yu.A., Venikov V.A., Zhukov 


domingo, 1 de novembro de 2015

LOS PROBLEMAS EN LA TEORIA DE CIRCUITOS VN Popov ,Biryukov


LINK
http://www.mediafire.com/view/gntw1lfb77dgoj5/PROBLEMAS_TEORIA_DE_CIRCUITOS_POPOV.pdf

Fundamentos de la teoría de circuitos Popov VP - Основы теории цепей Попов В.П.



Fundamentos de la teoría de circuitos Popov VP - Основы теории цепей Попов В.П.
El libro corresponde al programa del curso "Fundamentos de la teoría de circuitos." Establece la teoría de circuitos eléctricos lineales con parámetros concentrados y distribuidos en condiciones de estado estacionario y transitorio; Se presta mucha atención al análisis de los fundamentos de circuitos no lineales resistivas, conceptos de matriz topológica, la teoría de grafos, los métodos de la máquina de formación de ecuaciones de equilibrio eléctricos, análisis de circuitos con fuentes controladas.

LINK ORIGINAL EN LAWEB FORMATO DJVU
http://mexalib.com/download/206657

THEORY OF LINEAR ELECTRICAL CIRCUITS-LOSEV


LINK BOOK ORIGINAL EN FORMATO DJVU
http://mexalib.com/download/206714

quarta-feira, 28 de outubro de 2015

Development of Three-phase On-Board Battery Charger for PHEV ( plug-in hybrid electrical vehicle ) without High-Capacity Electrolytic Capacitor Graduate School, Myongji University Department of Electrical Engineering ZHANG YINGHAO




Development of Three-Phase On-Board Battery Charger for PHEV without High-Capacity Electrolytic Capacitor Ying-hao, Zhang Department of Electrical Engineering Graduate School, Myongji University Advisor Professor Byung-Moon Han
A new two-stage on-board battery charger which can operate in both three-phase mode and single-mode is proposed for plug-in hybrid electric vehicles (PHEVs). It consists of three identical chargers which connect to battery in parallel, and each of them has a cascaded structure of high frequency resonant converter with a constant switching frequency for electrical isolation, and buck-boost converter for charging control and harmonic regulation of input current under wide range line-input voltage. This structure uses small link capacitors so that high-capacity electrolytic capacitors can be removed in automotive applications. An LLC resonant converter is proposed in the first stage. The parallel buck-boost converters operating in discontinuous conduction mode are employed in the second stage, so that the voltage stress of components could be reduced and the simple controller can be used to control charging current. Digital control of converter is realized by applying DSP (Digital Signal Processor) that performs constant current through duty control of buck-boost converter. Duty ratio of LLC converter is unregulated. Proposed Converter stably operates in various load condition (within 10kW) and it is proven that the proposed converter achieves efficiency of higher than 93% and power factor of higher than 0.99 through experiment..

LINK
http://www.mediafire.com/view/0r5lad355h3odb9/Development_of_Three-phase_On-Board_Battery-28-10-2015%282%29.pdf

sábado, 17 de outubro de 2015

ELECTROMAGNETISMO - CLAUDIO GRAÇA-CURSO DE ENGENHARIA MECANICA UNIVERSIDADE FEDERAL DE SANTA MARIA BRASIL


HOJE SURFANDO NA WEB ENCONTRE ESTE INTERESANTE LIVRO EM PORTUGUES DO PROFESSOR CLAUDIO GRAÇA DA UNIVERSIDADE FEDERAL DE SANTA MARIA  NA
SIGUENTE PAGINA WEB PODEM CONFERIR:
http://coral.ufsm.br/cograca/eletro12
LINK ALTERNATIVO
https://copy.com/JEd3vsLmNYRfGiLp
AGRADECIMENTO ESPECIAL AO PROFESSOR CLAUDIO GRAÇA  Curso de Engenharia Mecânica  POR DISPONIBILIZAR LIVREMENTE ESTE LIVRO EN SUA PAGINA NA WEB,ELE ESTA REALIZANDO UM PROJETO DE ENSINO A CURTA DISTANCIA DE FISICA PODEM CONFERIR ESTE GRANDIOSO PROJETO NAS PAGINAS WEB SIGUENTES:
LINK1
http://coral.ufsm.br/cograca/livro.htm
LINK2
http://coral.ufsm.br/cograca/

COLEÇÃO DE PROVAS ENG04074 - Teoria de Circuitos I - Universidade Federal do Rio Grande do Sul Escola de Engenharia Departamento de Engenharia Elétrica-BRASIL



1. IDENTIFICAÇÃO. Nome do Departamento: DELET - DEPARTAMENTO DE ENGENHARIA ELÉTRICA (http://www.ufrgs.br/delet/) Nome da Atividade de Ensino: - ENG04074 - TEORIA DE CIRCUITOS I Cursos(s) de Oferecimento: - ENGENHARIA ELÉTRICA Caráter: - Obrigatória Pré-requisitos por Curso: FIS01182 – FÍSICA GERAL - ELETROMAGNETISMO MAT01354 – CÁLCULO E GEOMETRIA ANALÍTICA II-A

LINK ORIGINAL COM TODAS AS PROVAS
http://www.ufrgs.br/eng04030/Provas/index.htm

EEL420 - Circuitos Elétricos I - Engenharia Biomédica UFRJ - UNIVERSIDADE FEDERAL DE RIO DE JANEIRO BRASIL





COLEÇÃO DE PROVAS CIRCUITOS ELETRICOS EEL420

Provas Anteriores-EXAMENES ANTERIORES

 2007/2, 2008/12008/22009/12011/22012/22014/1,2014/2 e 2015/1.

LINK ORIGINAL DE ENGENHARIA BIOMEDICA
http://www.peb.ufrj.br/cursos/eel420/eel420.htm

quarta-feira, 14 de outubro de 2015

CORPE(Center of Reliable Power Electronics) - A Reliable Future Comes From Reliable Ideas

WDS - Power Supply Design Software



Design stable analog and digital power supplies in minutes!
Stabilising a power supply using WDS could not be simpler. The user simply selects their topology and types in their input/output specification into WDS. The software will then automatically select the appropriate component values for this design. At any stage the user can change the component values away from those automatically calculated by WDS and enter the actual component value used in their design. From power stage component selection to poles, zeros and controller coefficients; our advanced PSU design software, WDS, will greatly simplify the task of designing a power supply whilst still keeping you in control at every stage of the process. WDS has been designed as the ultimate toolbox for the power supply design engineer. Designs and stabilises analog and digital PSU control loops in minutes Automatically calculates poles and zeros as well as component values of the worlds most popular topologies Sophisticated control algorithms stabilise digital power supplies with automatic coefficient calculations for floating point, 32 bit and 16 bit processors Special features allow manipulation of digital compensator coefficients for a host of micro-controllers Automatic compensator design for isolated power supplies with TLx431/LMx431 and a host of industry standard optocouplers Simulations in time domain, frequency domain and ability to superimpose real measurements on simulated data

LINK
http://www.biricha.com/wds

TEORIA DO ELECTROMAGNETISMO KLEBER DAUM MACHADO


NAVEGANDO HOJE ENCONTRE NA WEB ESTE INTERESANTE LIVRO DE TEORIA DO ELECTROMAGNETISMO DO PROF. KLEBER MACHADO
PAGINA WEB ORIGINAL NA WEB
http://nead.uesc.br/arquivos/Fisica/eletromagnetismo/Kleber-Daum-Machado-Teoria-do-Eletromagnetismo-Vol3.pdf

sábado, 10 de outubro de 2015

Power electronic transformers for AC-AC and AC-DC conversion with reduced number of switches Castelino, Gysler Fatima (2013)


Autor Castelino, Gysler Fatima Data 2013-08
Type Thesis or Dissertation
Resumo In this research, a novel reduced-switch Power Electronic Transformer is proposed for three-phase power conversion (three-phase AC to AC as well as three-phase AC to DC). The goal of this project is to reduce the weight and size of the power converter by replacing the low-frequency transformers with high-frequency transformers (HFTs). The novelty of these proposed topologies is that they have only two controlled switches on the primary side of the high-frequency transformers. Additionally, these switches operate at 50% duty ratio, hence they are easy to control. Pulse Width Modulation (PWM) control is only necessary in the converters on the secondary side of the HFT. The modulation strategies proposed in this work achieve nearly Zero Current Switching (ZCS) for these two primary switches. In the proposed three-phase AC to AC Power Electronic Transformer, a Matrix Converter (MC) is employed on the secondary side of the transformer. Matrix converter with nine four-quadrant switches is a `more-silicon' and nearly capacitor-less solution for AC to AC conversion. This single-stage AC-AC converter without any electrolytic capacitors translates to higher reliability and efficiency. High-frequency transformers have finite leakage inductance, hence, any switching in the primary or secondary of the transformer requires commutation of the transformer inductive currents. This problem of leakage energy commutation and the required protection are studied in detail in this thesis. Other features of this converter are bi-directional power flow and power factor correction. The second Power Electronic Transformer is proposed for three-phase AC to DC power conversion. This converter operates on the Dual Active Bridge (DAB) principle wherein the transformer leakage inductance is used for power transfer. Hence, this converter does not suffer from problems associated with leakage energy commutation and additional snubber circuits are not required for this converter. The proposed modulation provides the advantages of unity power factor on the AC side, galvanic isolation and bi-directional power flow capability. Both these PETs have been analyzed and simulated. Laboratory prototypes have been built and tested to verify the advantages of the proposed PETs.
LINK ORIGINAL
http://conservancy.umn.edu/handle/11299/157756
LINK FULL PAPER
http://conservancy.umn.edu/bitstream/handle/11299/157756/Castelino_umn_0130E_14251.pdf?sequence=1&isAllowed=y