Comparação de Controladores Pids Robustos Otimizados Para Aplicação em Conversores de Potência
DOI:
https://doi.org/10.18618/REP.2021.1.0060Keywords:
Controle Robusto, Conversores de PotênciaAbstract
Este trabalho apresenta uma comparação entre duas alternativas para o projeto de controladores PIDs robustos otimizados, com ganhos de controle fixos, adequados para aplicação em conversores de potência com incertezas paramétricas. Diferentemente de projetos convencionais, que obtêm os ganhos de controle a partir de um modelo nominal da planta e verificam a posteriori a robustez contra incertezas paramétricas, as abordagens utilizadas neste trabalho garantem desempenho robusto no estágio de projeto, para plantas com parâmetros intervalares. A primeira abordagem utiliza um problema de programação linear, baseado em um polinômio alvo de malha fechada e em uma função objetivo linear, para encontrar os ganhos do PID. A segunda abordagem utiliza um algoritmo de otimização não linear, a partir de uma função objetivo baseada em especificações no domínio da frequência, para encontrar, por meio de uma meta-heurística, os ganhos do controlador. Ambas as abordagens são orientadas por critérios de projeto amplamente utilizados em conversores, dados por frequência de cruzamento e margem de fase. Os procedimentos de projeto dos controladores PIDs robustos são apresentados e ilustrados por meio de resultados de simulações e experimentais para um estudo de caso, permitindo uma comparação de vantagens e desvantagens de cada uma das técnicas.
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