AUTOR DO BLOG ENG.ARMANDO CAVERO MIRANDA SÃO PAULO BRASIL

"OBRIGADO DEUS PELA VIDA,PELA MINHA FAMILIA,PELO TRABALHO,PELO PÃO DE CADA DIA,PROTEGENOS DO MAL"

"OBRIGADO DEUS PELA VIDA,PELA MINHA FAMILIA,PELO TRABALHO,PELO PÃO DE CADA DIA,PROTEGENOS  DO MAL"

“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”

segunda-feira, 23 de outubro de 2017

A New High Efficient Transformerless Inverter for Single Phase Grid-tied Photovoltaic System with Reactive Power Control -Monirul Islam Power Electronics and Renewable Energy Research Laboratory (PEARL) Department of Electrical Engineering University of Malaya



A New High Efficient Transformerless Inverter for Single Phase Grid-tied Photovoltaic System with Reactive Power Control
Monirul Islam Power Electronics and Renewable Energy Research Laboratory (PEARL)
Department of Electrical Engineering University of Malaya Kuala Lumpur, Malaysia

 Abstract—There has been an increasing interest in transformerless inverter for grid-tied photovoltaic (PV) system due to low cost, high efficiency, less weight, etc. Therefore, many transformerless topologies have been proposed and verified with real power injection only. Recently, almost every international regulation has imposed that a definite amount of reactive power should be handled by the grid-tied PV inverter. According to the standard VDE-AR-N 4105, grid-tied PV inverter of power rating below 3.68kVA, should attain power factor (PF) from 0.95 leading to 0.95 lagging. In this paper, a new high efficient transformerless topology is proposed for grid-tied PV system. The new topology structure and detail operation principle with reactive power flow is described. The proposed circuit structure does not lead itself to the reverse recovery issues which allow utilizing MOSFET switches to increase the overall efficiency. Finally, to validate the proposed topology, a 1kW laboratory prototype is built and tested. The experimental results show that the proposed topology can inject reactive power into utility grid without any additional current distortion and leakage current. The maximum efficiency and European efficiency of the proposed topology is measured and found to be 98.54% and 98.27%, respectively. 
Keywords—common mode, converter, high efficient, leakage current, reactive power, transformerless. 

LINK ORIGINAL WEB
https://umexpert.um.edu.my/file/publication/00005361_125971.pdf

sábado, 21 de outubro de 2017

Analysis and Design of Single-Phase Photovoltaic Grid-Connected Inverter - Jaehwe Shim Department of Embedded SW Graduate School, Kwangwoon University Seoul, Korea


Analysis and Design of Single-Phase Photovoltaic Grid-Connected Inverter
 Jaehwe Shim Department of Embedded SW 
Graduate School, Kwangwoon University Seoul, Korea 
Abstract
 This paper proposed a new maximum power point tracking(MPPT) algorithm to find true maximum power point(MPP) for mismatched PV(Photovoltaic) modules. And also, various anti-islanding algorithms for grid-connected PV system were analyzed comparatively. At first, in order to have PV PCS maximum power generation efficiency, maximum power point trackers are used to operate a solar PV panel at its MPP. A number of MPPT algorithms has been used in the past such as P&O, IncCond, etc. But these algorithm cannot track true maximum power point under mismatched PV modules caused by clouds, shadow, and snow. The multiple local maxima can be existed on PV characteristic curve under mismatched PV modules. Therefore, the proposed MPPT algorithm, which is capable of tracking the true MPP under mismatched PV, is verified by simulation and experiment. In addition, this paper covered various anti-islanding methods for distributed grid-connected PV PCS. The islanding is that the phenomenon wherein the distributed PV PCS does not detect the interruption due to the power failures and faults, but dose continue operation. Islanding phenomenon can cause to have maintenance engineer in danger and to have application load damaged. Therefore grid-connected PV PCS must be disconnected while detecting the islanding phenomenon within the specified time, which secures safety and reliability. In this paper past various anti-islanding algorithms were explained and verified validity comparatively. For the validity of the proposed MPPT algorithm, 3kW PV system was designed with connected PV simulator.
LINK
http://www.mediafire.com/file/zxhzxcphv8p7la1/Analysis_and_Design_of_Single_Phase_Photovoltaic_Grid_Connected_Inverter.pdf

Power Conversion Technology for Grid-connected PV inverter-Woo-Jun Cha (차 우 준) Department of Electrical Engineering Pohang University of Science and Technology



Power Conversion Technology for Grid-connected PV inverter 
 Woo-Jun Cha (차 우 준)
 Department of Electrical Engineering 
Pohang University of Science and Technology 2015 
 ABSTRACT 
This thesis proposes hardware circuits and control algorithm of grid-connected photovoltaic (PV) inverters having high efficiency. PV inverter can be classified into singlephase and three-phase inverter according to power capacity. A micro-inverter system is proposed for the single-phase inverter. This system is composed of step-up dc-dc converter that uses an active-clamp circuit with a series-resonant voltage doubler and a high efficiency inverter with single-switch-modulation. During the step-up dc-dc stage, the active-clamp circuit provides zero-voltage switching turn-on, recycles the energy stored in the leakage inductance of the transformer, and limits switch voltage stress. A series-resonant voltage doubler is used on the transformer secondary side to remove the reverse-recovery problem of the rectifier diodes. During the inverter stage, to improve efficiency and reliability in the proposed inverter, only single switch is modulated at switching frequency without shoot-through problem. This whole process minimizes power losses and eliminates a mismatch of a capacity between the PV panel and PV inverter, so the proposed micro-inverter is suitable for use in a single-phase grid connected PV inverter. A prototype design and experimental results are given to verify the proposed system. A novel space-vector modulation (SVM) for a three-phase PV inverter with simple software implementation is proposed. The conventional SVM algorithm for the three-phase PV inverter requires complex computations, such as square root and arctangent, and a sector selection algorithm. The proposed SVM algorithm can determine directly on-state times of switches without complex computations and complex sector selection algorithm. Experimental results show high performance of the proposed algorithm for the three-phase PV inverter.
LINK
http://www.mediafire.com/file/u6wnmz2xww2x80f/POWER_CONVERSION_TECHNOLOGY_FOR_CONNECTED_PV_INVERTER.pdf

quinta-feira, 12 de outubro de 2017

SEPOC 2017 10Th SEMINAR ON POWER ELECTRONICS AND CONTROL SANTA MARIA ,RS,BRAZIL * 22- 25 OCTOBER


SEPOC 2017

SEPOC 2017 is the 10th edition of the Seminar on Power Electronics and Control and this year the conference will be held with the IEEE seal. The meeting will take place at the Technology Center of the Federal University of Santa Maria and is organized by the IEEE Chapters and Student Branch.

The seminar’s objective is to provide interaction among academia and industry to discuss the latest cutting-edge technologies on Power Electronics and Control and their applications. In 2017, the conference is themed on distributed power generation.

Track 1: Energy Processing in Power Systems

Converter topologies/control for energy processing and/or grid connection
Modeling and energy conversion of sustainable sources
Energetic efficiency and load management
Energy storage systems modeling and control
Electric machines control and drives

Track 2: Distributed Generation Quality and Operation

Power systems modeling, operation, and control
Grid protection and energy quality
Distributed energy planning and expansion

Track 3: Smart Systems for Smart Grids

Topologies and control for smart illumination systems
Efficiency, technologies, and reliability of electronics equipment
Management and control of communication networks

INFORMAÇÃO COMPLETA SOBRE O SEPOC 2017 NO SEGUINTE WEBSITE:
http://coral.ufsm.br/sepoc/sepoc2017/

Rap Session 1: Regulamentação de inversores fotovoltaicos: Demandas, desafios e oportunidades

Panelists:

Chair: Lucas Vizzotto Bellinaso - UFSM 

Possui graduação em Engenharia Elétrica (2012), mestrado (2014) e doutorado (2017) pela Universidade Federal de Santa Maria. Atua principalmente nos seguintes temas: projeto e segurança de sistemas fotovoltaicos, conversores estáticos aplicados a sistemas fotovoltaicos e gerenciamento de potência/energia de sistemas híbridos. De 2012 a 2015, foi sócio-fundador da empresa Sonnen Energia. Atualmente é professor da Universidade Federal de Santa Maria (UFSM - Campus Cachoeira do Sul). É membro da IEEE, da Associação Gaúcha de Energia Solar (AGESOLAR) e da Associação Brasileira de Geração Distribuída (ABGD). 

   

Leandro Michels - UFSM

O Prof. Leandro Michels possui graduação em Engenharia Elétrica (2001) e doutorado em Engenharia Elétrica (2007), ambos pela Universidade Federal de Santa Maria (UFSM). Atua como professor Adjunto junto ao Departamento de Processamento de Energia Elétrica da mesma universidade, onde desenvolve atividade junto ao curso de Eng. de Controle e Automação (conceito 5 ENADE) e ao Grupo de Eletrônica de Potência e Controle (GEPOC) do Programa de Pós-Graduação em Eng. Elétrica (conceito 6 CAPES). Atualmente é bolsista de Produtividade em Desenvolvimento Tecnológico e Extensão Inovadora do CNPq categoria 1D. É autor de mais de 100 artigos científicos publicados em periódicos e conferências nacionais e internacionais, depositou 2 patentes de invenção, e foi orientador principal de 5 dissertações de mestrado e 2 teses de doutorado. Em 2011 foi Coordenador Geral do V Seminário de Eletrônica de Potência e Controle (SEPOC 2011), e em 2013 foi Coordenador Técnico Adjunto do 12° Congresso Brasileiro de Eletrônica de Potência (COBEP 2013). Desde dezembro de 2015 é o primeiro secretário da Associação Brasileira de Eletrônica de Potência (SOBRAEP). Foi editor convidado da Revista Eletrônica de Potência da SOBRAEP em 2015/2016. É atualmente o coordenador do LabEnsaios GEPOC, laboratório designado pelo INMETRO para realizar ensaios de inversores fotovoltaicos conectados à rede elétrica. Possui experiência na coordenação de projetos de pesquisa financiados por órgãos de fomento, como por exemplo, CNPq, CAPES e FAPERGS, além de projetos de pesquisa e desenvolvimento financiados por empresas do setor elétrico. Possui experiência na área de Engenharia Elétrica, com ênfase em Controle de Sistemas e Eletrônica de Potência, atuando principalmente nos seguintes temas: sistemas fotovoltaicos, modelagem e controle de conversores estáticos e controle digital aplicado.  

Denizar da Cruz Martins - UFSC

Possui graduação em Licenciatura com ênfase em Eletricidade (1978), graduação em Engenharia Elétrica (1978), mestrado em Engenharia Elétrica (1981), todos pela Universidade Federal de Santa Catarina (UFSC) e doutorado em Engenharia Elétrica pelo Institut National Polytechnique de Toulouse, França (1986). Galgou todos os níveis da carreira de magistério por concurso público, chegando a Professor Titular em janeiro de 1993. Atualmente é líder do INEP (Instituto de Eletrônica de Potência), e professor do Departamento de Engenharia Elétrica da Universidade Federal de Santa Catarina, onde leciona disciplinas de graduação e pós-graduação. Foi Chefe do Departamento de Engenharia Elétrica da UFSC por dois mandatos entre abril de 2007 a abril de 2011. Foi Coordenador do Programa de Pós-Graduação em Engenharia Elétrica do Centro Tecnológico da UFSC. Sócio Fundador da SOBRAEP (Sociedade Brasileira de Eletrônica de Potência). Foi Presidente da SOBRAEP (Sociedade Brasileira de Eletrônica de Potência). Já desenvolveu vários projetos tecnológicos em parceria com Empresas Nacionais. É membro das Sociedades: SOBRAEP, SBA e IEEE. É credenciado pelo Programa de Pós-Graduação em Engenharia Elétrica da UFSC para orientar alunos em dissertação de mestrado e em tese de doutorado. Tem experiência na área de Engenharia Elétrica, com ênfase em Eletrônica de Potência, atuando principalmente nos seguintes temas: conversores estáticos CC-CC e CC-CA, correção de fator de potência, qualidade de energia, processamento eletrônico da energia elétrica, redes ativas de distribuição, sistemas de geração distribuída, microrredes CC e CA, simulação de conversores estáticos e acionamentos elétricos. Possui em torno de 300 artigos científicos. Publicou dois livros nacionais na área de Eletrônica de Potência e dois capítulos de livros internacionais na área de processamento eletrônico da energia solar fotovoltaica.

Marcelo Pinho Almeida - USP

Engenheiro Eletricista formado pela Universidade Federal do Pará e Doutor pelo Programa de Pós-graduação em Energia da Universidade de São Paulo. É secretário do Comitê de Estudos em Sistemas Fotovoltaicos do COBEI/ABNT e membro diretor da Associação Brasileira de Energia Solar. Trabalha nas áreas de engenharia elétrica, sistemas fotovoltaicos e energias renováveis, em aplicações isoladas e conectadas à rede.

Análise do Circuito de Placa Controladora de Portão Automático (1/3)

domingo, 8 de outubro de 2017

QUALIDADE DE ENERGIA Eng. Msc Jonathan Dômini Sperb, Prof.Dr. Eng.Marcello Mezaroba DISCIPLINA CONDICIONADORES DE ENERGIA UNIVERSIDADE DO ESTADO DE SANTA CATARINA UDESC BRASIL







QUALIDADE DE ENERGIA Jonathan Dômini Sperb, Eng. Msc. Prof. Marcello Mezaroba  
DISCIPLINA CONDICIONADORES DE ENERGIA
JOINVILLE-CENTRO DE CIÊNCIAS TECNOLÓGICAS

 UNIVERSIDADE DO ESTADO DE SANTA  CATARINA UDESC BRASIL

Qualidade de Energia:
 Aumento da utilização do termo Qualidade de Energia
–Pela concessionária (geração, transmissão e distribuição)
–Pelos consumidores (indústrias)
LINK ORIGINAL DO ARTIGO:
http://www.joinville.udesc.br/portal/professores/mezaroba/materiais/CEN___Aula_01___Qualidade_de_Energia.pdf

sábado, 30 de setembro de 2017

Introduccion Al Analisis De Circuitos Edicion 10 Robert L. Boylestad


NAVEGANDO HOY EN LA INTERNET ENCONTRE ESTE EXCELENTE LIBRO ESTUDIE CON EL CUANDO ESTUDIE INGENIERIA ELECTRONICA EN LA GLORIOSA UNIVERSIDAD NACIONAL MAYOR DE SAN MARCOS LINMA PERU,ES DE ACCESO LIBRE ESTA EN EL SITE ARCHIVE.ORG UN PROYECTO UNIVERSAL DE DIFUSION DEL CONOCIMIENTO.

 Introduccion Al Analisis De Circuitos Edicion 10 Robert L. Boylestad by Robert L. Boylestad
 Topics
Introduccion, Analisis, Circuitos, Edicion, 10, Robert, Boylestad Collection opensource Language Spanish Ésta es la edición actualizada del texto Introducción al análisis de circuitos, que durante más de tres décadas ha sido el clásico en este campo. Desarrolla la presentación más completa de la materia e incluye ejemplos que ilustran paso a paso los procesos y los fundamentos del campo con una base sólida y accesible. Es uno de los libros mas usados y recomendados para empezar en el mundo de la electrónica. Conceptos claros y profundamente explicados para lograr el mejor entendimiento y asimilación de los fenómenos.
LINK ORIGINAL EN LA WEB:
https://archive.org/details/IntroduccionAlAnalisisDeCircuitosEdicion10RobertL.Boylestad
LINK DIRECTO DEL LIBRO
https://archive.org/download/IntroduccionAlAnalisisDeCircuitosEdicion10RobertL.Boylestad/Introduccion%20al%20analisis%20de%20circuitos%20-%20Edicion%2010%20-%20Robert%20L.%20Boylestad.pdf

domingo, 24 de setembro de 2017

Transformer comparison by core form and winding structure Woong-Jae Kang Department of Electrical Engineering Graduate School Gyeongsang National University




Flyback Transformer Performance by Core and Winding Structure 

 Abstract 
Transformer comparison by core form and winding structure Woong-Jae Kang Department of Electrical Engineering Graduate School Gyeongsang NationalUniversity 

Supervised by Professor Hwi-Beom Shin
The leakage inductance of the flyback transformer causes the voltage spike in the MOSFET switch. The RCD snubber is typically used to reduce the voltage spike. The current method change the transformer winding structure to reduce effect of leakage inductance, because it is difficult to reduce influence of leakage inductance any more in circuit improvement. In this paper, it show the change for voltage spike and ringing depending on winding structure and core form of transformer.
LINK
http://www.mediafire.com/file/6kj45ksizg7z5m2/FLYBACK_PLANO.pdf

terça-feira, 5 de setembro de 2017

Development of Photovoltaic Inverter used Grid-Connected Distributed Power Jeong-Do Kim Department of Electrical Engineering Graduate School Pukyong National University









Development of Photovoltaic Inverter used Grid-Connected Distributed Power 
Jeong-Do Kim 

Department of Electrical Engineering Graduate School Pukyong National University 

Abstract

This paper relates to grid-connected single-phase inverter system, the proposed system is a gate pulse signal was added to the active auxiliary resonant circuit in the bridge arm of a conventional grid-connected single-phase half-bridge inverter, main switch is modulated by the SPWM method by configuring so that the, take a feature that can control the multi-phase alternating current can be used in the batch phase inverter. And active by the secondary resonance also work during the snubber circuit a dead time period, soft switching is possible because it actually turns a basic switch in the on state-off and resonant operation after turning the other main switch-which was applied to the whole of the gate signal have the characteristic. Further, when the conventional program is shorter than the width of the gate pulse signal active auxiliary resonant snubber operation time in the operation in the hard switching to occur even if the H, L is the reverse of the gate pulse signal. This power supply is in reversal of the power supply circuit is a short circuit may possibly be damaged since. To prevent this, this paper has set the ARCP operation time and modulation rate settings and processes the pulse of the gate pulse signal reversal was the program not to occur. 114 Further, as the main switch is in the off state to the time when the other switch is turned on, and the dead time is a hard switching method in case of the conventional method to sequence the switching pattern 1.5[μs], While for setting the dead time of the soft switching system with 2.0[ms], For this paper the sequence switching patterns applied to the soft-switching method is 4.0[μs] because the pulse width of the hard-switched at the same modulation rate and time to get a high density to suppress the resonant inductor current as a whole small effect of improving the efficiency have. Running a soft switching operation by the switching pattern sequence scheme applied to the paper, it is possible to suppress the surge voltage and the surge current, the generation of noise of the device is reduced as compared to the effect of the hard switching method.

LINK:
http://www.mediafire.com/file/1dyn6jy9g5767gj/PHOTOVOLTAIC_INVERTER.pdf