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

Inversor Dual-Buck Monofásico Sem Transformador para Injeção de Energia na Rede Lucas Munaretto- Marcelo L. Heldwein-Universidade Federal de Santa Catarina — UFSC Departamento de Engenharia Elétrica e Eletrônica / Instituto de Eletrônica de Potência — INEP, Florianópolis – SC, Brasil

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.

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/

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