Revista Eletrônica de Potência (Brazilian Journal of Power Electronics)

Palavras Chaves: Controle Robusto, Conversor Conectado à Rede, Otimização por enxame de partículas, Realimentação de estados

Resumo
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.

Title: COMPARISON BETWEEN PARTIAL AND FULL STATE FEEDBACK CONTROLLERS OPTIMIZED FOR GRID-CONNECTED CONVERTERS SUBJECT TO PARAMETRIC UNCERTAINTIES

Keywords: Grid-connected Converter, Particle swarm optimization, Robust Control, State feedback

Abstract
This paper proposes a comparison between state feedback techniques using two control loops for current regulation of grid-connected converters with LCL filter. The inner loop aims at the damping of the resonance of the LCL filter and in implemented here in twe different ways: by means of a full state feedback, or by means of a partial state feedback, allowing to reduce the number of sensors. The external loop uses state feedback of resonant controllers in order to ensure the tracking of sinusoidal references for the currents, and the rejection of harmonic disturbances from the grid voltage. The gains of both control loops are tuned off-line by means of a particle swarm optimization algorithm, which is effective to provide controllers that allow stability and optimized performance against uncertainties in the grid impedance and harmonics, ensuring grid currents complying the IEEE 1547 Standard. A performance analysis of the controllers indicates the superiority of the controller based on full state feedback. However, the results with the controller based on partial state feedback are suitable for narrow intervals of uncertainty in the grid impedance.

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