Revista Eletrônica de Potência (Brazilian Journal of Power Electronics)

Palavras Chaves: Conversor multiportas, Fluxo de potência bidirecional, Indutores acoplados, Microrrede híbrida

Resumo

Microrredes híbridas têm despertado interesse no sistema elétrico, pois são capazes de contemplar fontes/cargas de corrente alternada e fontes/cargas de corrente contínua, diminuindo dessa forma a quantidade de estágios de conversão que seriam necessários para conectar essas fontes e cargas de diferentes características. Neste contexto, este trabalho propõe uma nova topologia de um conversor bidirecional de interface entre o barramento CA e o barramento CC de uma microrrede híbrida para aplicações em redes de distribuição de baixa tensão. A porta CA do conversor é trifásica com neutro (para permitir o uso de cargas monofásicas) e multinível baseada em indutores acoplados. O uso de indutores acoplados na porta CA tem como objetivo principal a redução da ondulação (ripple) da corrente de saída, o que permite a redução do indutor do filtro de saída. A porta CC do conversor compartilha o mesmo braço do neutro da porta CA de forma a reduzir o número de semicondutores.

Title: COUPLED INDUCTORS-BASED DC-AC MULTILEVEL CONVERTER FOR APPLICATION IN HYBRID MICROGRIDS

Keywords: Bidirectional power flow, Coupled inductors, Hybrid microgrid, Multiport converter

Abstract

Hybrid microgrids have been of interest in the electrical system because they are able to contemplate alternating current sources/loads and direct current sources/loads, thus reducing the amount of conversion stages that would be required to connect these sources and loads of different characteristics. This paper proposes a novel bidirectional power converter topology to interface the ac bus and the dc bus of a hybrid microgrid for application in low-voltage distribution grid. The converter ac port is three-phase with neutral (to allow the use of single-phase loads) and multilevel based on coupled-inductors. The use of coupled-inductors in the ac port has the main objective of current ripple reduction, allowing the reduction of the output filter inductor. The converter dc port shares the same leg with the neutral of the ac port in such way to reduce the semiconductor count.

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