Revista Eletrônica de Potência (Brazilian Journal of Power Electronics)

Palavras Chaves: Controle Robusto, energia eólica, Filtro LCL, Gerador de relutância variável, Inversor Conectado à Rede

Resumo
Este artigo apresenta como contribuição uma estratégia de controle para geradores de relutância variável conectados à rede por meio de inversor trifásico com filtro LCL, na qual controladores robustos são projetados para garantir estabilidade e desempenho. Um controlador sliding mode é utilizado para regular a tensão do barramento CC, sendo detalhados o procedimento de projeto e a análise de estabilidade com esta técnica. Para o inversor conectado à rede, um controlador de corrente robusto por realimentação de estados é projetado com base em desigualdades matriciais lineares, garantindo correntes de rede com baixo conteúdo harmônico, rejeição de distúrbios e fornecendo um certificado de estabilidade robusta frente a incertezas e variações paramétricas nas impedâncias da rede. Resultados experimentais e de simulação são apresentados, confirmando boa regulação da tensão do barramento CC e correntes injetadas na rede com bons desempenhos transitório e em regime permanente, atendendo aos requisitos de norma pertinente para conexão à rede elétrica.

Title: ROBUST CONTROL APPLIED TO SWITCHED RELUCTANCE GENERATORS CONNECTED TO THE GRID

Keywords: Grid-Tied Inverter, LCL filter, Robust Control, switched reluctance generator, wind power

Abstract
This paper presents as contribution a control strategy for a grid connected switched reluctance generator by means of a three-phase inverter with an LCL filter, in which robust controllers are designed to ensure stability and performance. A sliding mode controller is used to regulate the DC bus voltage, being detailed the design procedure and the stability analysis with this technique. For the grid connected inverter, a robust state feedback current controller is designed based on linear matrix inequalities, ensuring grid-injected currents with low harmonic content, rejection of disturbances from the grid voltages and providing a certificate of robust stability in the face of uncertainties and parametric variations in the grid impedances. Experimental and simulation results are presented, confirming good regulation of the DC bus voltage and grid-injected currents with good transient and steady state performance, meeting the requirements of the relevant standard for grid connection.

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