“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

sexta-feira, 29 de dezembro de 2017

Linhas de Transmisão - Apresentação da Obra LT CC 800kV XINGU - ESTREITO (BMTE)-BRASIL




Linha de Transmissão (LT) Corrente Contínua (CC) +800 kV Xing/Estreito e de suas Instalações Associadas. Esta LT, com extensão de 2.086,9 km, interceptará quatro estados – Pará, Tocantins, Goiás e Minas Gerais. A LT terá início na Subestação (SE) Xingu, localizada a aproximadamente 17 km da UHE Belo Monte, no município de Anapu-PA, seguindo até a SE Estreito, localizada no município de Ibiraci-MG. Considerando a extensão e importância do empreendimento e buscando otimizar o planejamento e a execução das obras, a LT (CC) +800 kV Xingu/Estreito foi dividida em 8 trechos, cada um com aproximadamente 260 km. Um grupo de quatro construtoras (EPCistas) será responsável pelos respectivos trechos contratados, possibilitando, dessa forma, um maior controle por parte da equipe da SPE S.A. Um dos Eletrodos será instalado no município de Altinópolis, SP, e será interligado à Estação Conversora (EC) Estreito por meio da Linha de Eletrodo, que interceptará 5 municípios: Ibiraci e Claraval, no Estado de Minas Gerais, e Franca, Patrocínio Paulista e Altinópolis, no Estado de São Paulo. Já o Eletrodo que interligará a EC Xingu será instalado em Anapu, PA, com a Linha de Eletrodo sendo instalada apenas neste município.

 LOCALIZAÇÃO DO EMPREENDIMENTO 
O Mapa de Localização apresenta a localização geográfica do empreendimento, nos Estados de Pará, Tocantins, Goiás, Minas Gerais e São Paulo.

OBJETIVOS E JUSTIFICATIVAS DO EMPREENDIMENTO A Usina Hidrelétrica de Belo Monte, em construção na região de Altamira e Vitória do Xingu, no Pará, na sua configuração final, terá capacidade instalada de 11.233 MW, sendo 11.000 MW na casa de força principal e 233 MW na casa de força secundária. Por se tratar de uma usina hidrelétrica com grande capacidade instalada, com potencial para gerar muita energia, parte da produção durante os meses chuvosos será enviada para os estados das regiões Sudeste e Nordeste, principais consumidores do país. A fim de facilitar e otimizar o escoamento da energia produzida, foram comparadas diversas tecnologias existentes. Por fim, optou-se pelo sistema de Corrente Contínua de ±800 kV para reforço à interligação Norte – Sudeste, além de um sistema em corrente alternada de 500 kV como reforço às interligações Norte - Nordeste – Sudeste. As Instalações Associadas da LT (CC) +800 kV Xingu/Estreito incluem as Estações Conversoras (EC) Xingu e Estreito, dois Eletrodos de Terra, com suas respectivas Linhas de Eletrodo, com extensões de aproximadamente 46 km (Linha de Eletrodo Xingu) e 74 km (Linha de Eletrodo Estreito), para interligação desses eletrodos às ECs, e sete Estações Repetidoras (ERs).

VER RELATORIO COMPLETO  NO SEGUINTE LINK ORIGINAL
http://www.bmte.com.br/wp-content/uploads/2016/06/RIMA.pdf

quinta-feira, 28 de dezembro de 2017

10th SEMINAR ON POWER ELECTRONICS AND CONTROL-SANTA MARIA RS - BRAZIL


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.


Plenary Session 03: Reliability of Power Electronic Systems – Challenges and State-of-the-Art 

 Speaker: Huai Wang - Aalborg University, Denmark Huai Wang is currently an Associate Professor and a Research Thrust Leader with the Center of Reliable Power Electronics (CORPE), Aalborg University, Denmark. 

His research addresses the fundamental challenges in modelling and validation of power electronic component failure mechanisms, and application issues in system-level predictability, condition monitoring, circuit architecture, and robustness design. Prof. Wang is a lecturer of a 2-day industry/PhD course on Capacitors in Power Electronics Applications, and a 3-day industry/PhD course on Reliability of Power Electronic Systems held annually at Aalborg University. He is an invited speaker at the European Center for Power Electronics (ECPE) workshops, and a tutorial lecturer at leading power electronics conferences (ECCE, APEC, EPE, PCIM, IECON, etc.). He has co-edited a book on Reliability of Power Electronic Converter Systems in 2015, filed four patents in capacitive DC-link inventions, and contributed a few concept papers in the area of power electronics reliability. Prof. Wang received his PhD degree from the City University of Hong Kong, Hong Kong, and Bachelor degree from Huazhong University of Science and Technology, Wuhan, China. He was a visiting scientist with the ETH Zurich, Switzerland, from August to September 2014, and with the Massachusetts Institute of Technology (MIT), Cambridge, MA, USA, from September to November 2013. He was with the ABB Corporate Research Center, Baden, Switzerland, in 2009. He received the IEEE PELS Richard M. Bass Outstanding Young Power Electronics Engineer Award, in 2016, for the contribution to the reliability of power electronic conversion systems. He serves as an Associate Editor of IEEE Journal of Emerging and Selected Topics in Power Electronics and IEEE Transactions on Power Electronics.

LINK  : http://farol.ufsm.br/transmissao/transmissao-ao-vivo-sepoc-24102017-09h

quarta-feira, 27 de dezembro de 2017

Single phase transformerless inverter topologies for grid-tied photovoltaic system: A review - Monirul Islam a,Saad Mekhilef ,Mahamudul Hasan



Single phase transformerless inverter topologies for grid-tied photovoltaic system: A review Monirul Islam a,Saad Mekhilef ,Mahamudul Hasan 

 Power Electronics and Renewable Energy Research Laboratory (PEARL), Department of Electrical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia 
Department of Mechanical Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia

 Abstract :
Grid-tied inverters are the key components of distributed generation system because of their function as an effective interface between renewable energy sources and utility. Recently, there has been an increasing interest in the use of transformerless inverter for low-voltage single-phase grid-tied photovoltaic (PV) system due to higher efficiency, lower cost, smaller size and weight when compared to the ones with transformer. However, the leakage current issues of transformerless inverter, which depends on the topology structure and modulation scheme, have to be addressed very carefully. This review focuses on the transformerless topologies, which are classified into three basic groups based on the decoupling method and leakage current characteristics. Different topologies under the three classes are presented, compared and evaluated based on leakage current, component ratings, advantages, and disadvantages. An examination of demand for the inverter, the utility grid, and the PV module are presented. A performance comparison in MATLAB/Simulink environment is done among different topologies. Also an analysis has been presented to select a better topology. Finally, based on the analysis and simulation results, a comparison table has been presented. Furthermore, some important experimental parameters have been summarized.
LINK
http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.702.4372&rep=rep1&type=pdf

sábado, 23 de dezembro de 2017

H6-type transformerless single-phase inverter for grid-tied photovoltaic system -Monirul Islam, Saad Mekhilef ✉ Power Electronics and Renewable Energy Research Laboratory (PEARL), Department of Electrical Engineering, University of Malaya.



H6-type transformerless single-phase inverter for grid-tied photovoltaic system ISSN 1755-4535
Received on 20th April 2014 Accepted on 7th October 2014 doi: 10.1049/iet-pel.2014.0251
 www.ietdl.org
Monirul Islam, Saad Mekhilef ✉ Power Electronics and Renewable Energy Research Laboratory (PEARL), Department of Electrical Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia ✉ E-mail: saad@um.edu.my

 Abstract:
There has been an increasing interest in transformerless inverter for grid-tied photovoltaic (PV) system because of the benefits of lower cost, smaller volume as well as higher efficiency compared with the ones with transformer. However, one of the technical challenges of the transformerless inverter is the safety issue of leakage current which needs to be addressed carefully. In addition, according to the international regulations, transformerless inverter should be capable of handling a certain amount of reactive power. In this study, a new H6-type transformerless inverter for grid-tied PV system is proposed that can eliminate the threat of leakage current. The proposed topology has also the capability to inject reactive power into the utility grid. Three-level output voltage employing unipolar sinusoidal pulsewidth modulation can be achieved with the proposed topology. The proposed topology structure and detail operation principle with reactive power control are investigated. The relationship among the existing topologies and their reactive power control capability are also discussed. The proposed topology is simulated in MATLAB/Simulink software to initially verify the accuracy of theoretical explanations. Finally, a universal prototype rated 1 kW has been built and tested. The experimental results validate the theoretical analysis and simulation results.
VIEW COMPLETE TEXT:
https://pdfs.semanticscholar.org/43da/3251d204cbce6582f68347422b84d95e4a1f.pdf

domingo, 10 de dezembro de 2017

High-Frequency Transformer Design for Solid- State Transformers in Electric Power Distribution Systems Roderick Javier Garcia Montoya University of Arkansas, Fayetteville




High-Frequency Transformer Design for Solid-State Transformers in Electric Power Distribution Systems
ABSTRACT
A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science in Electrical Engineering by Roderick Javier Garcia Montoya Universidad Tecnológica de Panamá Bachelor of Science in Electromechanical Engineering, 2011
December 2015 University of Arkansas This thesis is approved for recommendation to the Graduate Council. ABSTRACT The objective of this thesis is to present a high- or medium-frequency transformer design methodology for Solid-State Transformer (SST) applications. SSTs have been proposed as a replacement of the traditional 50/60 Hz transformer in applications demanding high-power density. Moreover, due to the high penetration of distributed generation, DC grids, energy storage systems, and sensitive loads, SSTs have been considered as an enabling technology for envisioned future energy systems. These applications demand additional functionalities that may not be achieved with traditional transformers. For example, active power flow control, harmonic suppression, voltage regulation, voltage sag compensation, and reduced size and volume. In this thesis, SST topologies are evaluated in order to determine their impact upon the transformer design. In addition, design considerations for core and wire selections, isolation requirements, and different transformer structures are investigated. As a result, the proposed transformer design methodology accounts for leakage inductance requirements for optimal power transfer, high-frequency effects in the transformer core and windings, and a flux density optimization to maximize transformer’s efficiency. The design procedure has been implemented in MATLAB® as an interactive tool for designing high-frequency transformers.
LINK
http://scholarworks.uark.edu/cgi/viewcontent.cgi?article=2381&context=etd

sábado, 9 de dezembro de 2017

Design and Development of High-voltage and High-frequency Transformer for Solid-state Transformer* Park Siho - Kyungpook National University Daegu, Korea





Design and Development of High-voltage and High-frequency Transformer for Solid-state Transformer* Park Siho School of Architectural, Civil, Environmental, and Energy Engineering 

Graduate School, Kyungpook National University Daegu, Korea
 (Supervised by Professor Cha Honnyong)

 (Abstract)
In this paper, design guide of high-voltage isolated high-frequency transformer is proposed. Since a potential difference of up to 20 kV occurs at both ends of a transformer constituting a 3-port 3-level NPC based dual half-bridge DAB converter of solid-state transformer, it is necessary to design a transformer capable of 30 kV insulation considering margin. In order to insulate a voltage of 30 kV with air only, a very long distance between the primary and secondary wire of the transformer must be used. Therefore, bobbins made of Teflon resin and Polycarbonate were fabricated and insulation was obtained. To reduce the insulation parameter, core was connected to output neutral point terminal. The bobbin consists of an inner bobbin, an outer bobbin, a guard, and is designed to have sufficient dielectric strength. Through the simulation verification, only the primary wire portion was molded to remove the dielectric breakdown element generated at the portion where the outer bobbin and the guard contact with each other. A prototype transformer was built, completed operation verification and passed 30kV withstand voltage test. In the case of temperature test, there is no enough air layer to allow heat to escape from the secondary wire. Therefore, a high number of temperatures are measured, but this can be solved by turning the fan on.

Seminário Científico de Sistemas de Eletrônica de Potência – SCSEP 2017 – nos dias 13 e 14 de dezembro, no Auditório de Engenharia Elétrica no Centro Tecnológico (CTC) da UFSC.


O Instituto de Eletrônica de Potência (INEP) promoverá o terceiro Seminário Científico de Sistemas de Eletrônica de Potência – SCSEP 2017, evento que ocorrerá nos dias 13 e 14 de dezembro de 2017 no Auditório Luiz Antonio Teixeira, localizado no prédio da Engenharia Elétrica da UFSC, Florianópolis e será organizado por comissão local. O seminário está programado para receber aproximadamente 100 pessoas, entre alunos e professores da instituição e de outras, assim como profissionais da área que atuam nos setores público e privado. O evento tem como objetivo apresentar e divulgar os últimos avanços da área por meio da ação de alunos e pesquisadores do Instituto, incluindo pós-doutorandos, doutorandos, mestrandos, alunos de iniciação científica e tecnológica e em conclusão de curso de graduação. Tais trabalhos estão sendo desenvolvidos no INEP e se encontram em estágio avançado, representando possíveis soluções para a indústria e possibilitando, assim, a interação entre as partes. No evento serão realizadas também palestras e debates com convidados especialistas da área, com a finalidade de discutir as tendências e demandas atuais para a área de Eletrônica de Potência, bem como suas perspectivas futuras.
WEBSITE: http://scsep.inep.ufsc.br/


 LINK DA REVISTA SCSEP2017
http://scsep.inep.ufsc.br/wp-content/uploads/2015/09/Revista_SCSEP_2017.pdf

quarta-feira, 6 de dezembro de 2017

Doctoral Thesis A Study on High Efficiency Bidirectional Grid-tied Converters -Sung-Ho Lee (이 성 호) Department of Electrical Engineering Pohang University of Science and Technology







Doctoral Thesis 
A Study on High Efficiency Bidirectional Grid-tied Converters Sung-Ho Lee (이 성 호) 
Department of Electrical Engineering Pohang University of Science and Technology 2016 

This thesis presents three high efficiency grid-tied converter topologies and their respective control algorithms. These converters are applicable to various industrial fields such as energy storage systems (ESS), renewable energy systems, uninterruptible power supply (UPS) systems, and electric vehicles (EV). First, a high efficiency bidirectional grid-tied flyback converter that uses a single power conversion technique and a control system for it are introduced. The proposed converter consists of a bidirectional flyback dc-dc converter and an unfolding circuit. Due to its switching control strategy, the proposed converter performs bidirectional power conversion between the energy storage device and the grid through only single step. From the model analysis, the inherent dynamic characteristics are figured out. Based on the analysis, a control system is developed, which consists of a linear feedback controller with a low pass filter, a repetitive controller, and a feed-forward controller; this overcomes the constrains caused by a right-half-plane zero and a filter resonance and makes the proposed converter achieve the desired control performances and stability. In conclusion, the proposed converter can obtain high efficiency using a single power conversion technique, and the developed control system makes the proposed converter feasible. Second, a high efficiency single-phase bidirectional inverter for a PV energy system integrated with an energy storage system. The proposed single-phase inverter is developed using the transformerless system configuration so that it provides high power conversion efficiency, excellent power density, and low production cost. Using its circuit structure and switching operation, the proposed inverter can suppress the ground leakage current which is considered to be one of the most important design parameters in a transformerless PV system. Therefore, the proposed inverter gives the feasibility for the transforemrless system configuration in a PV energy system integrated with an energy storage system and enhances the overall performance of the bidirectional power converter system. The third is a novel high efficiency three-phase bidirectional grid-tied converter with high power density for high power applications. The proposed converter is composed of the threelevel dc-dc converter and the modified three-phase T-type three-level inverter. The threelevel converter circuit configuration gives smaller passive component size and lower switch voltage stress compared to other two-level grid-tied converters. In addition, due to its novel circuit structure, the proposed converter can use the active and passive components for only two phases of the grid in the inverter stage and eliminate the leakage current problem. Thus, because the proposed converter enables to not only decrease the number of components but also make the transformerless configuration feasible, it provides higher efficiency and higher power density compared to other high power grid-tied converters. All proposed converters are analyzed theoretically, and implemented practically. to evaluate their performance. Finally, the experimental results show that the proposed converters improve overall performance such as high power conversion efficiency, power density, and production cost with satisfying the standards for the grid regulations.

sexta-feira, 24 de novembro de 2017

9° SENSE - Seminário Nacional de Segurança e Saúde no Setor Elétrico Brasileiro




9° SENSE - Seminário Nacional de Segurança e Saúde no Setor Elétrico Brasileiro
 22, 23 e 24 novembro 2017 8h00 às 17h00 auditório do Instituto de Energia e Ambiente - IEE/USP - Av. Prof. Luciano Gualberto, 1.289 - Cidade Universitária, Butantã, São Paulo

 Programação e inscrições em http://www.sense.funcoge.org.br Alinhada ao seu conceito estratégico de agregar conhecimento, a Fundação COGE - FUNCOGE, em conjunto com o Instituto de Energia e Ambiente da Universidade de São Paulo - IEE/USP e o Sindicato da Indústria da Energia no Estado de São Paulo - SINDIENERGIA, promoverá o 9° SENSE. São objetivos do evento: a) Congregar os profissionais da área de SSTQV - Segurança e Saúde no Trabalho e Qualidade de Vida das empresas do Setor Energético, visando o intercâmbio de experiências, o relacionamento, o convívio e a colaboração entre eles; b) Incentivar a produção de estudos e trabalhos focando a prevenção de acidentes, a promoção da saúde e qualidade de vida dos trabalhadores; c) Divulgar e discutis as alterações mais recentes da legislação pertinente a SST, de forma a auxiliar as empresas e seus profissionais na sua implementação; d) Apresentar as novidades no que se refere a EPI - Equipamentos de Proteção Individual, permitindo aos profissionais de SSTQV a discussão junto aos fornecedores.
Complementarmente, o evento pretende que os participantes conheçam o Laboratório de Ensaios de Vestimentas - LEVe/IEE/USP, inaugurado no final de 2016, que coloca o Brasil no seleto grupo de países com capacidade tecnológica para a realização de ensaios em vestimentas FR e EPI, de vital importância para a proteção dos trabalhadores do setor elétrico brasileiro.
LINK
http://www.sense.funcoge.org.br/

terça-feira, 21 de novembro de 2017

Low Voltage Ride-Through of Single-Phase Transformerless Photovoltaic Inverters Yongheng Yang Frede Blaabjerg Huai Wang Aalborg University, Aalborg Denmark




Y. Yang, F. Blaabjerg, and H. Wang "Low voltage ride-through of single-phase transformerless photovoltaic inverters,” IEEE Trans. Industry Applications, in press.

 Abstract 
Transformerless photovoltaic (PV) inverters are going to be more widely adopted in order to achieve high efficiency, as the penetration level of PV systems is continuously booming. However, problems may arise in highly PV-integrated distribution systems. For example, a sudden stoppage of all PV systems due to anti-islanding protection may contribute to grid disturbances. Thus, standards featuring with ancillary services for the next generation PV systems are under a revision in some countries. The future PV systems have to provide a full range of services as what the conventional power plants do, e.g. Low Voltage Ride-Through (LVRT) under grid faults and grid support service. In order to map future challenges, the LVRT capability of three mainstream single-phase transformerless PV inverters under grid faults are explored in this paper. Control strategies with reactive power injection are also discussed. The selected inverters are the full-bridge inverter with bipolar modulation, the full-bridge inverter with DC bypass and the Highly Efficient and Reliable Inverter Concept (HERIC). A 1 kW single-phase gridconnected PV system is analyzed to verify the discussions. The tests confirmed that, although the HERIC inverter is the best candidate in terms of efficiency, it is not very special feasible in case of a voltage sag. The other two topologies are capable of providing reactive current during LVRT. A benchmarking of those inverters is also provided in this paper, which offers the possibility to select appropriate devices and to further optimize the transformerless system.

ORIGINAL URL

http://vbn.aau.dk/files/102349282/77954_tia.2013.2282966.pdf

domingo, 19 de novembro de 2017

A NOVEL FORWARD SINGLE-STAGE HIGH POWER CORRECTION CONVERTER WITH CONTROLLER DESIGN - HSUEH -CHAN CHEN




ABSTRACT
In this thesis ,the principle of the graft scheme is dicussed.By means of graft scheme ,the buck-boost and forward converter are combined to create a novel forward single-stage high power correction (HPFC) converter. The main advantages for the proposed converter are unity power factor,low voltage stress of the bulk capcitor,anthe output voltage regulation.
LINK
http://www.mediafire.com/file/m46m6ryzz53458r/A_NOVEL_FORWARD_SINGLE-STAGE_HIGH_POWER_CORRECTION_CONVERTER.pdf

sábado, 18 de novembro de 2017

Analysis of Discharge Lamp Driving Characteristics using PSpice Jeong-Ho Cho Department of Electrical Engineering, Graduate School of Industry, Pusan National University





Analysis of Discharge Lamp Driving Characteristics using PSpice Jeong-Ho Cho Department of Electrical Engineering, Graduate School of Industry, Pusan National University 

 ABSTRACT 
A new PSpice dynamic fluorescent lamp model has been developed which describes the non-linear resistance of fluorescent lamps operating at high-frequency. The model is based on exponential approximation that represents the equivalent resistance variation as function of power, constructed, by experimental results for several power levels. Simulation and experimental results are presented to verify the feasibility of the model and, moreover, and electronic ballast example using the proposed model is presented to further demonstrate its applications.

segunda-feira, 6 de novembro de 2017

DEVELOPMENT OF 30KVA INVERTER USING SIC MOSFET FOR 180◦C AMBIENT TEMPERATURE OPERATION -Feng Qi1, Miao Wang1, Longya Xu1, Bo Zhao2, Zhe Zhou2 1The Ohio State University, USA -2Smart Grid Research Institute of SGCC, China


LINK http://www.mediafire.com/file/l0hmo41isv7jw8a/INVERTER_SIC.pdf

Sistemas Eletrônicos para Iluminação - Ricardo Nederson do Prado Alexandre Campos Àlysson Raniere Seidel Rafael Adaime Pinto - Universidade Federal Santa Maria - BRASIL








 LINK MINICURSO COMPLETO
http://www.mediafire.com/file/lb8p0qd3ztd7666/ILUMINACAO.pdf

WORKSHOP: CONEXÃO DE FONTES RENOVÁVEIS E SEUS IMPACTOS PARA A QUALIDADE DE ENERGIA ELÉTRICA -São Paulo - 5 de Dezembro de 2017


São Paulo - 5 de Dezembro de 2017 
 Auditório do Prédio da Engenharia Elétrica – Av. Prof. Luciano Gualberto, Travessa 3, nº 158, Escola Politécnica da USP. 

 A SBQEE em parceria com o Laboratório de Redes Elétricas Avançadas (LGrid) realizará em São Paulo workshop voltado para empresas e profissionais do setor elétrico nacional sobre os impactos da conexão de fontes renováveis de energia, como eólicas e fotovoltaicas, para a qualidade de energia elétrica. O evento contará com palestras sobre os principais fenomenos elétricos observados nestas conexões, estudoas para detecção e mitigação, aspectos sobre a medição no ponto de conexão, além de casos reais.

 Acesse o mapa do local do evento https://goo.gl/maps/9bcFmMitzHt

INFORMAÇÃO COMPLETA
http://www.sbqee.org.br/sbqee/eventos/workshop;jsessionid=b825jj4n82pw