Controle adaptativo de corrente aplicado a conversores estáticos conectados à rede elétrica
Autor(a) principal: | |
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Data de Publicação: | 2013 |
Tipo de documento: | Tese |
Idioma: | por |
Título da fonte: | Manancial - Repositório Digital da UFSM |
Texto Completo: | http://repositorio.ufsm.br/handle/1/3679 |
Resumo: | This thesis addresses the design of adaptive current controllers applied for voltagesource grid-connected converters with LCL-filter. Due to the grid equivalent impedance uncertainty and/or variation at the point of connection, the current controller of such converters may become unstable or have a poor performance with fixed-gain controllers because the grid impedance is part of the dynamic model. So, adaptive control techniques are proposed to ensure stability and performance of current controllers for grid-connected converter with LCL-filter even without knowledge of the grid equivalent impedance. Continuous time adaptive control, from the theoretical point of view, is a well established control technique. However, in this application, a discrete-time current controller is implemented. There are some differences between discrete-time and continuous-time adaptive controllers. When the controlled variable is the converter current, a model reference adaptive state feedback is proposed. The adaptation algorithm, responsible to update the gains in real-time, consists on a recursive least-squares (RLS) algorithm. When the controlled variable is the grid current, a model reference adaptive state feedback is also used. However, the RLS algorithm has some modifications to keep the controller robust under unmodeled dynamics. The RLS algorithm is used because it has better parametric convergence characteristics compared to other algorithms. The grid voltage disturbance is rejected making some small modifications on the controller structure. Simulation results are validated by experimental results in a 5,5kW three-phase grid-connected converter, which shows good convergence and steady state stability of the adaptive controllers. Finally, some comparisons with fixed gain current controllers are presented to show de advantages and disadvantages of each controller. |
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2017-05-262017-05-262013-02-28MASSING, Jorge Rodrigo. Adaptive current control applied to grid-connected static converters. 2013. 199 f. Tese (Doutorado em Engenharia Elétrica) - Universidade Federal de Santa Maria, Santa Maria, 2013.http://repositorio.ufsm.br/handle/1/3679This thesis addresses the design of adaptive current controllers applied for voltagesource grid-connected converters with LCL-filter. Due to the grid equivalent impedance uncertainty and/or variation at the point of connection, the current controller of such converters may become unstable or have a poor performance with fixed-gain controllers because the grid impedance is part of the dynamic model. So, adaptive control techniques are proposed to ensure stability and performance of current controllers for grid-connected converter with LCL-filter even without knowledge of the grid equivalent impedance. Continuous time adaptive control, from the theoretical point of view, is a well established control technique. However, in this application, a discrete-time current controller is implemented. There are some differences between discrete-time and continuous-time adaptive controllers. When the controlled variable is the converter current, a model reference adaptive state feedback is proposed. The adaptation algorithm, responsible to update the gains in real-time, consists on a recursive least-squares (RLS) algorithm. When the controlled variable is the grid current, a model reference adaptive state feedback is also used. However, the RLS algorithm has some modifications to keep the controller robust under unmodeled dynamics. The RLS algorithm is used because it has better parametric convergence characteristics compared to other algorithms. The grid voltage disturbance is rejected making some small modifications on the controller structure. Simulation results are validated by experimental results in a 5,5kW three-phase grid-connected converter, which shows good convergence and steady state stability of the adaptive controllers. Finally, some comparisons with fixed gain current controllers are presented to show de advantages and disadvantages of each controller.Esta tese trata do projeto de controladores adaptativos aplicados a conversores estáticos alimentados em tensão conectados à rede elétrica através de filtro LCL. Devido às características incertas e/ou variantes da impedância equivalente da rede no ponto de conexão de conversores estáticos, o controle da corrente de tais conversores pode se tornar instável ou o desempenho pode ser degradado com a utilização de controladores com ganhos fixos, pois a característica da rede faz parte do modelo dinâmico. Com base nisso, é proposto o uso de técnicas de controle adaptativo para garantir a estabilidade e o desempenho do controlador de corrente de conversores conectados à rede mesmo sem o conhecimento da sua impedância equivalente. Controle adaptativo em tempo contínuo, no ponto de vista teórico, é uma técnica de controle bem consolidada. No entanto, na aplicação em questão, o controlador de corrente é implementado em tempo discreto. Controle adaptativo em tempo discreto apresenta algumas diferenças quanto aos controladores em tempo contínuo. Quando a variável de controle é a corrente do conversor, é proposta a utilização de uma retroação de estados adaptativa por modelo de referência cujo adaptador, responsável por atualizar os ganhos em tempo real, consiste em um algoritmo recursivo por mínimos quadrados (RLS). Quando a variável de controle é a corrente da rede, também é utilizada uma retroação de estados adaptativa por modelo de referência, porém o algoritmo RLS apresenta modificações para torná-lo robusto à dinâmicas não modeladas. O algoritmo RLS é utilizado por ter melhores características de convergência paramétrica se comparado a outros algoritmos. O distúrbio de tensão da rede é rejeitado fazendo-se algumas modificações na estrutura da lei de controle. Os resultados de simulação são validados através de resultados experimentais em um conversor de potência nominal de 5,5kW, os quais mostram as características promissoras dos controladores de corrente adaptativos. Por fim, são apresentadas comparações com controladores de corrente de ganhos fixos, mostrando as vantagens e desvantagens de cada uma dos controladores.Conselho Nacional de Desenvolvimento Científico e Tecnológicoapplication/pdfporUniversidade Federal de Santa MariaPrograma de Pós-Graduação em Engenharia ElétricaUFSMBREngenharia ElétricaConversores conectados à redeControle adaptativoFiltro LCLGrid-connected convertersAdaptive controlLCL filterCNPQ::ENGENHARIAS::ENGENHARIA ELETRICAControle adaptativo de corrente aplicado a conversores estáticos conectados à rede elétricaAdaptive current control applied to grid-connected static convertersinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesisPinheiro, Humbertohttp://lattes.cnpq.br/5900576762082210Gründling, Hilton Abíliohttp://lattes.cnpq.br/6128096609162437Rech, Cassianohttp://lattes.cnpq.br/9375639768929991Montagner, Vinícius Folettohttp://lattes.cnpq.br/1107194715234856Stefanello, Márciohttp://lattes.cnpq.br/9333498570249062Carati, Emerson Giovanihttp://lattes.cnpq.br/8681744957229767http://lattes.cnpq.br/9321791993006911Massing, Jorge Rodrigo3004000000074003003003003003003003008aab6aac-f16b-4f23-8761-b8462475f027804dc3f0-0a2b-4743-a062-27ea491dbc944188a74e-402a-499d-80e2-be75ac07774e0eff1f5c-63dc-4c86-a76c-a1128768b34433eec781-2078-4331-a9b2-9e016ff9ebdb16a9f366-1a4f-4b69-8d3e-b6528d4c409b671900e0-71ad-4ee6-a6eb-a1e2c6800628info:eu-repo/semantics/openAccessreponame:Manancial - Repositório Digital da UFSMinstname:Universidade Federal de Santa Maria (UFSM)instacron:UFSMORIGINALMASSING, JORGE RODRIGO.pdfapplication/pdf1984785http://repositorio.ufsm.br/bitstream/1/3679/1/MASSING%2c%20JORGE%20RODRIGO.pdfaf810519cd7fd53fc2ba9b7af9a63486MD51TEXTMASSING, JORGE RODRIGO.pdf.txtMASSING, JORGE RODRIGO.pdf.txtExtracted texttext/plain318252http://repositorio.ufsm.br/bitstream/1/3679/2/MASSING%2c%20JORGE%20RODRIGO.pdf.txt9b69e22cda9be035f079ef72e474c345MD52THUMBNAILMASSING, JORGE RODRIGO.pdf.jpgMASSING, JORGE RODRIGO.pdf.jpgIM Thumbnailimage/jpeg5039http://repositorio.ufsm.br/bitstream/1/3679/3/MASSING%2c%20JORGE%20RODRIGO.pdf.jpgcd2127bae156f6d7aebe69eb568768e9MD531/36792023-06-12 16:27:32.832oai:repositorio.ufsm.br:1/3679Repositório Institucionalhttp://repositorio.ufsm.br/PUBhttp://repositorio.ufsm.br/oai/requestopendoar:39132023-06-12T19:27:32Manancial - Repositório Digital da UFSM - Universidade Federal de Santa Maria (UFSM)false |
dc.title.por.fl_str_mv |
Controle adaptativo de corrente aplicado a conversores estáticos conectados à rede elétrica |
dc.title.alternative.eng.fl_str_mv |
Adaptive current control applied to grid-connected static converters |
title |
Controle adaptativo de corrente aplicado a conversores estáticos conectados à rede elétrica |
spellingShingle |
Controle adaptativo de corrente aplicado a conversores estáticos conectados à rede elétrica Massing, Jorge Rodrigo Conversores conectados à rede Controle adaptativo Filtro LCL Grid-connected converters Adaptive control LCL filter CNPQ::ENGENHARIAS::ENGENHARIA ELETRICA |
title_short |
Controle adaptativo de corrente aplicado a conversores estáticos conectados à rede elétrica |
title_full |
Controle adaptativo de corrente aplicado a conversores estáticos conectados à rede elétrica |
title_fullStr |
Controle adaptativo de corrente aplicado a conversores estáticos conectados à rede elétrica |
title_full_unstemmed |
Controle adaptativo de corrente aplicado a conversores estáticos conectados à rede elétrica |
title_sort |
Controle adaptativo de corrente aplicado a conversores estáticos conectados à rede elétrica |
author |
Massing, Jorge Rodrigo |
author_facet |
Massing, Jorge Rodrigo |
author_role |
author |
dc.contributor.advisor1.fl_str_mv |
Pinheiro, Humberto |
dc.contributor.advisor1Lattes.fl_str_mv |
http://lattes.cnpq.br/5900576762082210 |
dc.contributor.advisor-co1.fl_str_mv |
Gründling, Hilton Abílio |
dc.contributor.advisor-co1Lattes.fl_str_mv |
http://lattes.cnpq.br/6128096609162437 |
dc.contributor.referee1.fl_str_mv |
Rech, Cassiano |
dc.contributor.referee1Lattes.fl_str_mv |
http://lattes.cnpq.br/9375639768929991 |
dc.contributor.referee2.fl_str_mv |
Montagner, Vinícius Foletto |
dc.contributor.referee2Lattes.fl_str_mv |
http://lattes.cnpq.br/1107194715234856 |
dc.contributor.referee3.fl_str_mv |
Stefanello, Márcio |
dc.contributor.referee3Lattes.fl_str_mv |
http://lattes.cnpq.br/9333498570249062 |
dc.contributor.referee4.fl_str_mv |
Carati, Emerson Giovani |
dc.contributor.referee4Lattes.fl_str_mv |
http://lattes.cnpq.br/8681744957229767 |
dc.contributor.authorLattes.fl_str_mv |
http://lattes.cnpq.br/9321791993006911 |
dc.contributor.author.fl_str_mv |
Massing, Jorge Rodrigo |
contributor_str_mv |
Pinheiro, Humberto Gründling, Hilton Abílio Rech, Cassiano Montagner, Vinícius Foletto Stefanello, Márcio Carati, Emerson Giovani |
dc.subject.por.fl_str_mv |
Conversores conectados à rede Controle adaptativo Filtro LCL |
topic |
Conversores conectados à rede Controle adaptativo Filtro LCL Grid-connected converters Adaptive control LCL filter CNPQ::ENGENHARIAS::ENGENHARIA ELETRICA |
dc.subject.eng.fl_str_mv |
Grid-connected converters Adaptive control LCL filter |
dc.subject.cnpq.fl_str_mv |
CNPQ::ENGENHARIAS::ENGENHARIA ELETRICA |
description |
This thesis addresses the design of adaptive current controllers applied for voltagesource grid-connected converters with LCL-filter. Due to the grid equivalent impedance uncertainty and/or variation at the point of connection, the current controller of such converters may become unstable or have a poor performance with fixed-gain controllers because the grid impedance is part of the dynamic model. So, adaptive control techniques are proposed to ensure stability and performance of current controllers for grid-connected converter with LCL-filter even without knowledge of the grid equivalent impedance. Continuous time adaptive control, from the theoretical point of view, is a well established control technique. However, in this application, a discrete-time current controller is implemented. There are some differences between discrete-time and continuous-time adaptive controllers. When the controlled variable is the converter current, a model reference adaptive state feedback is proposed. The adaptation algorithm, responsible to update the gains in real-time, consists on a recursive least-squares (RLS) algorithm. When the controlled variable is the grid current, a model reference adaptive state feedback is also used. However, the RLS algorithm has some modifications to keep the controller robust under unmodeled dynamics. The RLS algorithm is used because it has better parametric convergence characteristics compared to other algorithms. The grid voltage disturbance is rejected making some small modifications on the controller structure. Simulation results are validated by experimental results in a 5,5kW three-phase grid-connected converter, which shows good convergence and steady state stability of the adaptive controllers. Finally, some comparisons with fixed gain current controllers are presented to show de advantages and disadvantages of each controller. |
publishDate |
2013 |
dc.date.issued.fl_str_mv |
2013-02-28 |
dc.date.accessioned.fl_str_mv |
2017-05-26 |
dc.date.available.fl_str_mv |
2017-05-26 |
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.citation.fl_str_mv |
MASSING, Jorge Rodrigo. Adaptive current control applied to grid-connected static converters. 2013. 199 f. Tese (Doutorado em Engenharia Elétrica) - Universidade Federal de Santa Maria, Santa Maria, 2013. |
dc.identifier.uri.fl_str_mv |
http://repositorio.ufsm.br/handle/1/3679 |
identifier_str_mv |
MASSING, Jorge Rodrigo. Adaptive current control applied to grid-connected static converters. 2013. 199 f. Tese (Doutorado em Engenharia Elétrica) - Universidade Federal de Santa Maria, Santa Maria, 2013. |
url |
http://repositorio.ufsm.br/handle/1/3679 |
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por |
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por |
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300400000007 |
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Universidade Federal de Santa Maria |
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UFSM |
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Engenharia Elétrica |
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Universidade Federal de Santa Maria |
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