Conversor cc cc de alto ganho com características de fonte de corrente na saída para aplicações em sistemas fotovoltaicos e injeção de corrente em nanorredes

Abstract

This paper proposes a high-gain non-isolated DC-DC converter, operating in continuous conduction mode, powered from a photovoltaic panel and designed for connection in nanogrids. The proposal uses a voltage boosting cell associated with a coupled-inductor in order to achieve the high step-up voltage gain. Differently from the high gain converters frequently proposed in the literature, this one presents inherent characteristic of current source at the output, ideal for connection in DC voltage bus. In addition, the converter also presented favorable conditions with respect to the operation of the controlled switch, since, besides it turns on zero current switching (ZCS), it is subjected to low voltage when off, which contributed to reduction of losses and elevation of the efficiency. The qualitative and quantitative analysis of the converter is presented. A rated power 200 W prototype was implemented in the laboratory and tested, presenting a maximum efficiency of approximately 96.7%.