Study and implementation of the single-phase three-wire photovoltaic energy conversion system

A single-stage single-phase three-wire(1/spl phi/3W) photovoltaic energy conversion system connected with a utility power system is presented in this paper. The DC power generated by the solar cells was converted into AC power by a 1/spl phi/3w inverter with an auxiliary LC filter and was fed directly to the utility line. Since the output characteristics of the solar cells were highly affected by the environment and lumen of Sun, the PV energy conversion system was adapted to track the maximum power operation point. The size and weight of the PV conversion system can be largely reduced without energy storage devices, DC to DC converter, and center-tapped transformer. Finally, a 1 kW experimental prototype was built to demonstrate the performance of the proposed technique.