Development of a simple photovoltaic system for interconnection of utility power system

A simple photovoltaic power regeneration system for interconnection with a utility power system is described. The developed photovoltaic system of 3 kW has the following characteristics: (1) the power generated by a solar battery can be regenerated to the utility power source with a sinusoidal current waveform of specified power factor; (2) the solar battery is optimally controlled to get the maximum output power with high speed; (3) to maintain safety, the solar battery is isolated from the utility power system by the inverter involving a high frequency transformer; and (4) the maximum efficiency of the regenerative inverter is 93.6%. In the experiments, a solar battery simulator is employed instead of a solar battery to realize low cost and small size of the experimental system