Inversores fotovoltaicos trifásicos não isolados conectados à rede com técnicas para redução da corrente de fuga
Ano de defesa: | 2018 |
---|---|
Autor(a) principal: | |
Orientador(a): | |
Banca de defesa: | , , , |
Tipo de documento: | Tese |
Tipo de acesso: | Acesso aberto |
Idioma: | por |
Instituição de defesa: |
Universidade Federal de Santa Maria
Centro de Tecnologia |
Programa de Pós-Graduação: |
Programa de Pós-Graduação em Engenharia Elétrica
|
Departamento: |
Engenharia Elétrica
|
País: |
Brasil
|
Palavras-chave em Português: | |
Palavras-chave em Inglês: | |
Área do conhecimento CNPq: | |
Link de acesso: | http://repositorio.ufsm.br/handle/1/16145 |
Resumo: | This doctoral dissertation presents contributions related to transformerless grid-connected three-phase photovoltaic systems, focusing on the leakage current reduction. Among the leakage current reduction techniques, the use of modified LCL (MLCL) filter brings important benefits, such as: maintenance of the voltage synthesis capability of the inverter and topology and modulation strategy do not require any modification. However, this filter presents some peculiarities, mainly in their design and resonance peaks damping. Therefore, a damping technique is required to reduce the leakage current without causing instability problems. Although the passive damping presents a simple implementaion and low cost, it causes leakage current rise and reduces the system efficiency. In this sense, an active damping technique using state feedback in αβ0 coordinates applied to a grid-connected three-phase multilevel inverter with MLCL filter is presented aiming to damp the filter resonances, keeping the leakage current attenuation and increasing the system efficiency. The αβ-axis control system damps the resonance peaks of the differential circuits, controls the grid currents and rejects some periodical grid disturbances, while the 0-axis control system damps the resonance peak located at low frequencies in the common mode circuit. In this way, the highfrequency leakage current attenuation is preserved, while the low-frequency attenuation is improved. A reduced-order states observer for the filter capacitors voltages is designed to reduce the number of voltage sensors. Since the MLCL filter also attenuates the grid current harmonics, a design methodology that integrates the requirements of leakage current and grid harmonic distortion is proposed. At the end, an analysis of discontinuous Pulse Width Modulation (PWM) techniques applied to the grid-connected three-phase inverter is performed to reduce the switching losses and, consequently, improve its efficiency. In this case, a modified discontinuous PWM modulation is proposed to reduce the impact on the leakage current of the photovoltaic system. Additionally, a hybrid damping for the MLCL filter is proposed to preserve the characteristics of the modified modulation, where the αβ-axis is actively damped and the 0-axis is passively damped. It is shown that is possible to improve the system efficiency through the proposed modulation keeping a low leakage current. Simulation and experimental results reinforce the theoretical conclusions related to the active damping technique, MLCL filter design and the application of the discontinuous PWM modulation. |
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Biblioteca Digital de Teses e Dissertações do UFSM |
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2019-04-11T11:16:58Z2019-04-11T11:16:58Z2018-12-18http://repositorio.ufsm.br/handle/1/16145This doctoral dissertation presents contributions related to transformerless grid-connected three-phase photovoltaic systems, focusing on the leakage current reduction. Among the leakage current reduction techniques, the use of modified LCL (MLCL) filter brings important benefits, such as: maintenance of the voltage synthesis capability of the inverter and topology and modulation strategy do not require any modification. However, this filter presents some peculiarities, mainly in their design and resonance peaks damping. Therefore, a damping technique is required to reduce the leakage current without causing instability problems. Although the passive damping presents a simple implementaion and low cost, it causes leakage current rise and reduces the system efficiency. In this sense, an active damping technique using state feedback in αβ0 coordinates applied to a grid-connected three-phase multilevel inverter with MLCL filter is presented aiming to damp the filter resonances, keeping the leakage current attenuation and increasing the system efficiency. The αβ-axis control system damps the resonance peaks of the differential circuits, controls the grid currents and rejects some periodical grid disturbances, while the 0-axis control system damps the resonance peak located at low frequencies in the common mode circuit. In this way, the highfrequency leakage current attenuation is preserved, while the low-frequency attenuation is improved. A reduced-order states observer for the filter capacitors voltages is designed to reduce the number of voltage sensors. Since the MLCL filter also attenuates the grid current harmonics, a design methodology that integrates the requirements of leakage current and grid harmonic distortion is proposed. At the end, an analysis of discontinuous Pulse Width Modulation (PWM) techniques applied to the grid-connected three-phase inverter is performed to reduce the switching losses and, consequently, improve its efficiency. In this case, a modified discontinuous PWM modulation is proposed to reduce the impact on the leakage current of the photovoltaic system. Additionally, a hybrid damping for the MLCL filter is proposed to preserve the characteristics of the modified modulation, where the αβ-axis is actively damped and the 0-axis is passively damped. It is shown that is possible to improve the system efficiency through the proposed modulation keeping a low leakage current. Simulation and experimental results reinforce the theoretical conclusions related to the active damping technique, MLCL filter design and the application of the discontinuous PWM modulation.Esta Tese de Doutorado apresenta contribuições relacionadas a sistemas fotovoltaicos trifásicos não isolados conectados à rede, com enfoque na redução da corrente de fuga. Dentre as técnicas de redução da corrente de fuga em inversores trifásicos, o uso de filtro LCL modificado (LCLM) traz alguns importantes benefícios, como por exemplo: preservação da capacidade de síntese de tensão do inversor e dispensa modificações na sua topologia e modulação. Contudo, este filtro possui algumas peculiaridades, sobretudo no seu projeto e no amortecimento dos picos de ressonância. Logo, de modo a reduzir a corrente de fuga sem causar problemas de instabilidade, se faz necessário o uso de uma técnica de amortecimento. O amortecimento passivo, embora mais simples e de menor custo, causa elevação na corrente de fuga e reduz o rendimento do sistema. Neste sentido, objetivando amortecer as ressonâncias do filtro, mantendo a atenuação da corrente de fuga e elevando o rendimento do sistema, este trabalho apresenta uma técnica de amortecimento ativo por realimentação de estados em coordenadas αβ0 aplicada a um inversor trifásico multinível conectado à rede com filtro LCLM. O sistema de controle dos eixos αβ amortece o pico de ressonância dos circuitos diferenciais, controla a corrente injetada na rede e rejeita distúrbios harmônicos periódicos da rede, enquanto o sistema de controle do eixo 0 amortece o pico de ressonância em baixas frequências do circuito de modo comum. Desta forma, a atenuação da corrente de fuga em altas frequências é preservada, enquanto a atenuação em baixas frequências é melhorada. De modo a reduzir o número de sensores de tensão, um observador de estados de ordem reduzida para as tensões dos capacitores do filtro é projetado. Tendo em vista que o filtro LCLM também possui a função de atenuar os harmônicos das correntes da rede, uma metodologia de projeto que integra os requisitos de redução da corrente de fuga e atendimento as normas de harmônicos injetados na rede também é proposta. Ao final, é realizada uma análise da aplicação de técnicas de modulação PWM (Pulse Width Modulation) descontínuas ao inversor trifásico conectado à rede com o objetivo de reduzir as perdas de comutação e, consequentemente, elevar seu rendimento. Neste caso, uma modulação PWM descontínua modificada é proposta para reduzir o impacto deste tipo de modulação na corrente de fuga do sistema fotovoltaico. Além disso, de modo a preservar as características da referida modulação, um amortecimento híbrido do filtro LCLM é proposto, onde os eixos αβ são amortecidos ativamente e o eixo 0 é amortecido de forma passiva. Demonstra-se que é possível elevar o rendimento da estrutura através da modulação proposta mantendo uma reduzida corrente de fuga. Resultados de simulação e experimentais são apresentados e reforçam as conclusões teóricas referentes à técnica de amortecimento ativo, ao projeto do filtro LCLM e também à aplicação da modulação PWM descontínua.Conselho Nacional de Pesquisa e Desenvolvimento Científico e Tecnológico - CNPqporUniversidade Federal de Santa MariaCentro de TecnologiaPrograma de Pós-Graduação em Engenharia ElétricaUFSMBrasilEngenharia ElétricaAttribution-NonCommercial-NoDerivatives 4.0 Internationalhttp://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessAmortecimento ativoCorrente de fugaFiltro LCL modificadoInversor conectado à redeInversor fotovoltaico sem transformadorActive dampingLeakage currentModified LCL filterGrid-connected inverterTransformerless photovoltaic inverterCNPQ::ENGENHARIAS::ENGENHARIA ELETRICAInversores fotovoltaicos trifásicos não isolados conectados à rede com técnicas para redução da corrente de fugaTransformerless grid-connected three-phase photovoltaic inverters with techniques for reduction of the leakage currentinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesisRech, Cassianohttp://lattes.cnpq.br/9375639768929991Cavalcanti, Marcelo Cabralhttp://lattes.cnpq.br/4941009238623926Oliveira, Sérgio Vidal Garciahttp://lattes.cnpq.br/7485662763949116Michels, Leandrohttp://lattes.cnpq.br/9232567042677107Massing, Jorge Rodrigohttp://lattes.cnpq.br/9321791993006911http://lattes.cnpq.br/6353260911632016Giacomini, Julian Cezar30040000000760064098d57-ec9e-498c-823c-7d3c3559e353d4bb81ff-ea0b-4b11-85ef-a188674b4a8eabda938a-fbfb-45a2-a53c-fbcc3020e7bec3850f09-97ce-4fb4-88c3-760839185483d189f16d-cdf1-4a17-869a-3fa3d430058e11417947-e954-46bd-b9e0-a285b1d92d63reponame:Biblioteca Digital de Teses e Dissertações do UFSMinstname:Universidade Federal de Santa Maria (UFSM)instacron:UFSMORIGINALTES_PPGEE_2018_GIACOMINI_JULIAN.pdfTES_PPGEE_2018_GIACOMINI_JULIAN.pdfTese de Doutoradoapplication/pdf6814066http://repositorio.ufsm.br/bitstream/1/16145/1/TES_PPGEE_2018_GIACOMINI_JULIAN.pdfe237ddb5d05d5aaeb488583ec3261001MD51CC-LICENSElicense_rdflicense_rdfapplication/rdf+xml; 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dc.title.por.fl_str_mv |
Inversores fotovoltaicos trifásicos não isolados conectados à rede com técnicas para redução da corrente de fuga |
dc.title.alternative.eng.fl_str_mv |
Transformerless grid-connected three-phase photovoltaic inverters with techniques for reduction of the leakage current |
title |
Inversores fotovoltaicos trifásicos não isolados conectados à rede com técnicas para redução da corrente de fuga |
spellingShingle |
Inversores fotovoltaicos trifásicos não isolados conectados à rede com técnicas para redução da corrente de fuga Giacomini, Julian Cezar Amortecimento ativo Corrente de fuga Filtro LCL modificado Inversor conectado à rede Inversor fotovoltaico sem transformador Active damping Leakage current Modified LCL filter Grid-connected inverter Transformerless photovoltaic inverter CNPQ::ENGENHARIAS::ENGENHARIA ELETRICA |
title_short |
Inversores fotovoltaicos trifásicos não isolados conectados à rede com técnicas para redução da corrente de fuga |
title_full |
Inversores fotovoltaicos trifásicos não isolados conectados à rede com técnicas para redução da corrente de fuga |
title_fullStr |
Inversores fotovoltaicos trifásicos não isolados conectados à rede com técnicas para redução da corrente de fuga |
title_full_unstemmed |
Inversores fotovoltaicos trifásicos não isolados conectados à rede com técnicas para redução da corrente de fuga |
title_sort |
Inversores fotovoltaicos trifásicos não isolados conectados à rede com técnicas para redução da corrente de fuga |
author |
Giacomini, Julian Cezar |
author_facet |
Giacomini, Julian Cezar |
author_role |
author |
dc.contributor.advisor1.fl_str_mv |
Rech, Cassiano |
dc.contributor.advisor1Lattes.fl_str_mv |
http://lattes.cnpq.br/9375639768929991 |
dc.contributor.referee1.fl_str_mv |
Cavalcanti, Marcelo Cabral |
dc.contributor.referee1Lattes.fl_str_mv |
http://lattes.cnpq.br/4941009238623926 |
dc.contributor.referee2.fl_str_mv |
Oliveira, Sérgio Vidal Garcia |
dc.contributor.referee2Lattes.fl_str_mv |
http://lattes.cnpq.br/7485662763949116 |
dc.contributor.referee3.fl_str_mv |
Michels, Leandro |
dc.contributor.referee3Lattes.fl_str_mv |
http://lattes.cnpq.br/9232567042677107 |
dc.contributor.referee4.fl_str_mv |
Massing, Jorge Rodrigo |
dc.contributor.referee4Lattes.fl_str_mv |
http://lattes.cnpq.br/9321791993006911 |
dc.contributor.authorLattes.fl_str_mv |
http://lattes.cnpq.br/6353260911632016 |
dc.contributor.author.fl_str_mv |
Giacomini, Julian Cezar |
contributor_str_mv |
Rech, Cassiano Cavalcanti, Marcelo Cabral Oliveira, Sérgio Vidal Garcia Michels, Leandro Massing, Jorge Rodrigo |
dc.subject.por.fl_str_mv |
Amortecimento ativo Corrente de fuga Filtro LCL modificado Inversor conectado à rede Inversor fotovoltaico sem transformador |
topic |
Amortecimento ativo Corrente de fuga Filtro LCL modificado Inversor conectado à rede Inversor fotovoltaico sem transformador Active damping Leakage current Modified LCL filter Grid-connected inverter Transformerless photovoltaic inverter CNPQ::ENGENHARIAS::ENGENHARIA ELETRICA |
dc.subject.eng.fl_str_mv |
Active damping Leakage current Modified LCL filter Grid-connected inverter Transformerless photovoltaic inverter |
dc.subject.cnpq.fl_str_mv |
CNPQ::ENGENHARIAS::ENGENHARIA ELETRICA |
description |
This doctoral dissertation presents contributions related to transformerless grid-connected three-phase photovoltaic systems, focusing on the leakage current reduction. Among the leakage current reduction techniques, the use of modified LCL (MLCL) filter brings important benefits, such as: maintenance of the voltage synthesis capability of the inverter and topology and modulation strategy do not require any modification. However, this filter presents some peculiarities, mainly in their design and resonance peaks damping. Therefore, a damping technique is required to reduce the leakage current without causing instability problems. Although the passive damping presents a simple implementaion and low cost, it causes leakage current rise and reduces the system efficiency. In this sense, an active damping technique using state feedback in αβ0 coordinates applied to a grid-connected three-phase multilevel inverter with MLCL filter is presented aiming to damp the filter resonances, keeping the leakage current attenuation and increasing the system efficiency. The αβ-axis control system damps the resonance peaks of the differential circuits, controls the grid currents and rejects some periodical grid disturbances, while the 0-axis control system damps the resonance peak located at low frequencies in the common mode circuit. In this way, the highfrequency leakage current attenuation is preserved, while the low-frequency attenuation is improved. A reduced-order states observer for the filter capacitors voltages is designed to reduce the number of voltage sensors. Since the MLCL filter also attenuates the grid current harmonics, a design methodology that integrates the requirements of leakage current and grid harmonic distortion is proposed. At the end, an analysis of discontinuous Pulse Width Modulation (PWM) techniques applied to the grid-connected three-phase inverter is performed to reduce the switching losses and, consequently, improve its efficiency. In this case, a modified discontinuous PWM modulation is proposed to reduce the impact on the leakage current of the photovoltaic system. Additionally, a hybrid damping for the MLCL filter is proposed to preserve the characteristics of the modified modulation, where the αβ-axis is actively damped and the 0-axis is passively damped. It is shown that is possible to improve the system efficiency through the proposed modulation keeping a low leakage current. Simulation and experimental results reinforce the theoretical conclusions related to the active damping technique, MLCL filter design and the application of the discontinuous PWM modulation. |
publishDate |
2018 |
dc.date.issued.fl_str_mv |
2018-12-18 |
dc.date.accessioned.fl_str_mv |
2019-04-11T11:16:58Z |
dc.date.available.fl_str_mv |
2019-04-11T11:16:58Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/doctoralThesis |
format |
doctoralThesis |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://repositorio.ufsm.br/handle/1/16145 |
url |
http://repositorio.ufsm.br/handle/1/16145 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.cnpq.fl_str_mv |
300400000007 |
dc.relation.confidence.fl_str_mv |
600 |
dc.relation.authority.fl_str_mv |
64098d57-ec9e-498c-823c-7d3c3559e353 d4bb81ff-ea0b-4b11-85ef-a188674b4a8e abda938a-fbfb-45a2-a53c-fbcc3020e7be c3850f09-97ce-4fb4-88c3-760839185483 d189f16d-cdf1-4a17-869a-3fa3d430058e 11417947-e954-46bd-b9e0-a285b1d92d63 |
dc.rights.driver.fl_str_mv |
Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ |
eu_rights_str_mv |
openAccess |
dc.publisher.none.fl_str_mv |
Universidade Federal de Santa Maria Centro de Tecnologia |
dc.publisher.program.fl_str_mv |
Programa de Pós-Graduação em Engenharia Elétrica |
dc.publisher.initials.fl_str_mv |
UFSM |
dc.publisher.country.fl_str_mv |
Brasil |
dc.publisher.department.fl_str_mv |
Engenharia Elétrica |
publisher.none.fl_str_mv |
Universidade Federal de Santa Maria Centro de Tecnologia |
dc.source.none.fl_str_mv |
reponame:Biblioteca Digital de Teses e Dissertações do UFSM instname:Universidade Federal de Santa Maria (UFSM) instacron:UFSM |
instname_str |
Universidade Federal de Santa Maria (UFSM) |
instacron_str |
UFSM |
institution |
UFSM |
reponame_str |
Biblioteca Digital de Teses e Dissertações do UFSM |
collection |
Biblioteca Digital de Teses e Dissertações do UFSM |
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Biblioteca Digital de Teses e Dissertações do UFSM - Universidade Federal de Santa Maria (UFSM) |
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atendimento.sib@ufsm.br||tedebc@gmail.com |
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