Desenvolvimento de conversor comutado em baixa frequencia para aplicação em sistemas de geração distribuida baseados em celulas a combustivel / Development of a low-frequency commutation converter for distributed generation system based on fuel cells

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

The connection of distributed power sources with the utility grid generally needs an electronic power converter for processing the locally generated power and injecting current into the system. This work presents a system intended to low-power distributed generation composed by a DC primary source, as a fuel cell. A boost converter connects the supply to an inverter, composed by a three-phase one using low-frequency commutation, which injects the power into the grid and guarantees the AC power quality. An auxiliary circuit is added to the inverter topology in order to reduce the output voltage distortion, thus improving the current waveform. The employed control strategy allows a secure performance even if there are fluctuations in the generated power. The main advantages of this approach are the minimization of the switching losses (i.e. high efficiency) and the elimination of the EMI (which avoids high-frequency filters necessary in high-frequency commutation inverters). Design procedures are established permiting to reduce the volume of the elements, seeking a high power density. A 1300 V A converter prototype is implemented and tested. The obtained results confirm the theoretical analysis

ASSUNTO(S)

energia - fontes alternativas sistema de controle digital energia - conversão geração distribuida de energia eletrica fuel cells energy conversion standby generators celulas a combustivel dc-ca power conversion

ACESSO AO ARTIGO

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