Comparação Entre Controladores por Realimentação Parcial e Total de Estados Otimizados para Conversores Conectados à Rede Sujeitos a Incertezas Paramétricas
DOI:
https://doi.org/10.18618/REP.2023.1.0044Keywords:
Controle Robusto, Conversor Conectado à Rede, Otimização por enxame de partículas, Realimentação de estadosAbstract
Este artigo propõe uma comparação de técnicas de realimentação de estados, utilizando duas malhas de controle para a regulação das correntes de conversores conectados à rede por meio de filtro LCL. A malha interna visa ao amortecimento do pico de ressonância do filtro LCL e é implementada de duas formas diferentes: ou por uma realimentação total de estados, ou por uma realimentação parcial de estados, reduzindo o número de sensores. A malha externa utiliza a realimentação dos estados de controladores ressonantes para garantir rastreamento de referências senoidais para correntes e rejeição de distúrbios harmônicos provenientes das tensões da rede. Os ganhos das duas malhas de controle são sintonizados off-line por meio de um algoritmo de otimização por enxame de partículas, que se mostra eficaz para fornecer controladores que garantam estabilidade e desempenho otimizado frente a incertezas na impedância da rede e harmônicas na tensão de rede, garantindo correntes experimentais em conformidade com a norma IEEE 1547. A análise de desempenho dos controladores indica a superioridade do controlador com realimentação total de estados. Entretanto, os resultados da realimentação parcial também são satisfatórios para faixas estreitas de incerteza na impedância de rede.
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