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A PV(pbotoyoltaic) inverter is the power conversion equipment that converts dc power generated by PV cells into isolated ac power and interconnects it to a utility line. This paper describes a PV inverter with a novel cycloconverter for interconnection to a utility line. We developed this novel cycloconverter as a way of frequency conversion so that a small, high-frequency transformer can be used to minimize the size of the PV inverter. We manufactured a 3kW PV inverter as an experimental model with this novel cycloconverter for interconnection to a utility line. This equipment is 25% the size in volume and 17% the weight compared to our previous commercial-frequency isolation type inverter.In rated operations, excellent results were obtained; the output current distortion factor was less than 5.0% and conversion efficiency was as high as 92.1 %.

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