Estratégia de Controle para Conversor Boost Fotovoltaico Operando nos Modos MPPT e LPPT
DOI:
https://doi.org/10.18618/REP.2020.3.0006Keywords:
Geração Fotovoltaica, Perturbação e Observação (P&O), Rastreamento do Ponto de Máxima Potência (MPPT), Rastreamento do Ponto de Potência Limitada (LPPT)Abstract
Este artigo propõe uma estratégia de controle composta por um algoritmo de rastreamento do ponto de máxima potência (MPPT) e um algoritmo de rastreamento do ponto de potência limitado (LPPT) para conversores boost aplicados a um sistema fotovoltaico. Primeiramente, uma técnica MPPT tradicional é implementada e a partir disso, a técnica de LPPT proposta nesse trabalho é desenvolvida sem adição de novos sensores. O LPPT desenvolvido pode ser empregado tanto em sistemas fotovoltaicos que possuem apenas um conversor boost no estágio CC como também em sistemas com múltiplos conversores compartilhando o mesmo barramento CC do lado do inversor. Além disso, a estratégia proposta pode contribuir com o controle do inversor fotovoltaico quando o sistema necessita limitar a potência ativa gerada. É demonstrado que uma rápida resposta dinâmica de transição entre os modos de operação pode ser obtida com a estrutura proposta. Resultados experimentais em um arranjo de 3 kW são apresentados para dar suporte a teoria desenvolvida e ilustrar o bom desempenho do sistema.
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