Abstract

A photovoltaic generation system employing a interconnected inverter is now in the spotlight for its effectiveness in the popularization of clean energy in which no fossil fuels are used. Using storage batteries in this system allows a variety of functions to be added, making it possible to realize a further value-enhanced system. Since the interconnected inverter we have recently developed is equipped with a bidirectional converting function, the following functions can be additionally obtained. Namely, load levelling can be conducted by recharging storage batteries using power at midnight, and power can be supplied uninterruptedly to loads even during a power failure, thus serving as a UPS, as well.