Controlador Robusto MPC-LMI Aplicado Ao Conversor Boost Com Célula De Comutação De Três Estados
DOI:
https://doi.org/10.18618/REP.2017.1.2652Keywords:
Controle Robusto, Conversor Boost, Modelo Boost Linear Variante no Tempo, MPC-LMI Relaxado OfflineAbstract
Este artigo propõe uma estratégia de controle preditivo baseado em modelo aplicado a um conversor boost com célula de comutação de 3 estados que confere mais simplicidade e sistematização nas fases de projeto e análise do controlador, cujo ganho integral ajustável dispensa o reprojeto nas matrizes de ponderação. Para simplificar a análise de estabilidade do controlador, utiliza-se o conceito de elipsoides de estabilidade, um assunto ainda pouco explorado neste contexto. O controle preditivo proposto parte da modelagem da planta no espaço de estados médio linear e variante no tempo, cujas variações paramétricas são tratadas como incertezas politópicas expressas por meio de desigualdades matriciais lineares (LMIs) com relaxações. Aspectos teórico-experimentais são aplicados e analisados em um conversor de 1 kW com incertezas na tensão de entrada e na carga. Além disso, para estabelecer uma base de desempenho, o MPC proposto é comparado com o controlador LQR clássico conhecido na literatura. A estratégia de controle proposta apresenta vantagens considerando as variações do modelo decorrente dos testes de cargas em aplicações de conversores estáticos CC-CC.
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