Utilização de Controladores de Corrente para Rastreamento do Ponto de Máxima Potência em Arranjo Fotovoltaico

Alexandre S. BrasilMarcus V. A. Nunes


Este artigo apresenta o rastreamento de ponto máxima potência (MPPT) de arranjo fotovoltaico (PV) usando controle de corrente convencional baseado em medições de corrente, irradiância e temperatura. Foi realizada modelagem do arranjo PV conectado a um conversor CC-CC do tipo Boost e controles de corrente tipo histerese independente e proporcional-integral foram implementados para rastreamento de ponto máxima potência após variações abruptas de irradiância. O desempenho dos métodos utilizando controles de corrente foram comparados com um método de inteligência artificial, lógica de controle fuzzy, escolhido pelo seu desempenho estável e robusto nos mais diversos processos. A comparação entre as técnicas considerou o erro de estado estacionário, a resposta dinâmica e a eficiência em uma ampla faixa de potência. O MPPT Hist Indep e MPPT PI realizaram rastreamento do ponto de máxima potência de forma eficiente e precisa e suas vantagens e desvantagens em relação ao MPPT Fuzzy foram discutidas.

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