Processamento Parcial de Potência em Aplicações Fotovoltaicas Empregando Conversores H-Bridge/Push–Pull
DOI:
https://doi.org/10.18618/REP.2021.1.0062Keywords:
Conversor CC-CC, Processamento Parcial de Potência, Regulação Série de Tensão, sistemas fotovoltaicosAbstract
Este artigo propõe uma análise comparativa em termos da potência ativa e não-ativa processada entre dois conversores CC–CC H-bridge/push–pull configurados como reguladores série abaixadores/elevadores de tensão em sistemas fotovoltaicos (FV), os quais possibilitam a realização do processamento parcial de potência (PPP). Estes reguladores são o full-bridge phase-shift/push–pull alimentado em corrente (FBPS/CFPP) e o conversor proposto, o half-bridge simétrico/push–pull alimentado em corrente (SHB/CFPP). Para avaliar o processamento de potência, utiliza-se um procedimento baseado na teoria de Fryze das potências. Com base na faixa de regulação de tensão e na análise da potência processada, demonstra-se que o FBPS/CFPP e o SHB/CFPP adquirem a capacidade de realizar o PPP mediante a otimização da relação de espiras dos transformadores, sendo que o SHB/CFPP alcança o menor processamento ponderado de potência não-ativa, em razão de a modulação phase-shift utilizada pelo FBPS/CFPP produzir uma potência processada maior nesta aplicação FV. Para validar as abordagens, três protótipos de 2200 W foram construídos e ensaiados. Os resultados experimentais comprovam que a redução da potência ativa e não-ativa processada resulta em maiores eficiências.
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