Um Novo Método de Modulação para Conversores Multiníveis com Melhor Compromisso entre Perdas por Comutação e Thd
DOI:
https://doi.org/10.18618/REP.2011.2.118129Keywords:
Conversores multiníveis, Eficiência do Conversor, Métodos de Modulação, Perdas por Chaveamento, THDAbstract
O presente trabalho apresenta um novo método de modulação para conversores multiníveis em aplicações de média tensão e alta potencia, com redução da frequência de comutação e das perdas por comutação nas chaves e do THD da tensão na carga, quando comparado aos métodos PWM com Portadora Senoidal e Space Vector PWM e utilizado em inversores com cinco níveis ou mais. O metódo proposto apresenta também um baixo custo computacional. Suas vantagens em relação ao método Space Vector PWM foram verificadas através da simulação digital de um sistema composto por um conversor de cinco níveis acionando um motor de indução de 4,16 kV e 0,5 MW. Resultados experimentais preliminares utilizando-se um Processador Digital de Sinais comprovam alguns dos resultados obtidos em simulação.
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