Controle E Redução Das Correntes Harmônicas De Um Sistema De Geração Fotovoltaico Interligado À Rede Elétrica Sem Filtros Passivos
DOI:
https://doi.org/10.18618/REP.2013.4.11491160Keywords:
Controlador de corrente, controlador digital, controlador repetitivo, Sistema FotovoltaicoAbstract
Este trabalho apresenta alguns resultados da mo- delagem e projeto dos controladores de um sistema de geração fotovoltaico de 30 kWp conectado à rede elétrica do Campus da Universidade Federal de Juiz de Fora. O conversor de interface é interligado a rede elétrica usando somente as indutâncias de dispersão de um banco de transformadores monofásicos como filtro passivo. O algoritmo de controle foi desenvolvido no sistema de coordenadas síncrono (dq0). Dois controladores proporcional–integral (PI– SRF) idênticos foram projetados para regular as correntes sintetizadas em cada coordenada. Será mostrado que o controlador PI–SRF pode ter seu desempenho reduzido quando correntes distorcidas são drenadas pelo trans- formador de conexão. Para contornar o problema anterior será projetado um controlador repetitivo (RC) para ser conectado em paralelo com o PI–SRF. O desempenho do controlador híbrido (PI–SRF + RC) é testado em regime permanente e transitório para variações na potência convertida nos painéis fotovoltaicos. Resultados experimentais são apresentados para validar o projeto e o desempenho do controlador híbrido proposto.
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