Metodologia de Identificação de Falhas de Circuito Aberto para o Conversor CHB
DOI:
https://doi.org/10.18618/REP.e202513Keywords:
Cascata de Pontes Completa, Conversores Multiníveis, Falhas de circuito aberto, Filtro Média Móvel, Identificação de FalhasAbstract
Este artigo apresenta uma metodologia de identificação de falhas de circuito aberto aplicada ao conversor Cascata de Pontes Completa (Cascaded H-Bridge - CHB) que não depende da estratégia de modulação adotada. A técnica de identificação de falhas proposta neste artigo utiliza os sinais que são usualmente medidos para o controle deste conversor, tornando-o um método de fácil adaptação, podendo ser considerando de baixo custo de implementação. A identificação do evento de falha de circuito aberto de um dos interruptores é feita através da leitura do valor médio da tensão de saída. Este valor médio é tratado através de um filtro média móvel e, a partir dele, é possível determinar a condição de existência de falha do conversor. Com esta condição de falha ativa, são executados dois procedimentos principais, uma rotina de testes e uma estratégia de identificação e correção do módulo danificado. O método é validado experimentalmente utilizando um conversor CHB monofásico com quatro módulos, com modulação PDPWM. O estudo se originou da análise de falhas em módulos pontes completa quando operando sobre modulações multiníveis, também apresentado nesse artigo.
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