To stably control the output of a solar battery at a high speed by changing the gain of amplifying the deviation of a current command value supplied to a power inverter and an output current outputted from the power inverter corresponding to the variation range of an output voltage from the solar battery.
In a current control circuit 25, first control Loop-A for controlling the current command value so as to correct the deviation of a set reference operating voltage and the actual output voltage of the solar battery 10 and second control Loop-B for correcting the deviation of a specified current command value and the output current from an inverter 11 detected by a current detector 26 are activated. In this case, in the current control circuit 25, corresponding to the variation range of an amplitude generated at the time of changing the reference operating voltage, the gain of an amplifier circuit is changed. That is, by increasing the gain in the case that the variation range is small, control is performed so as to make the output voltage of the solar battery 10 quickly reach a specified reference operating voltage, and the gain is reduced in the case that the variation range is large.
HIGASHIHAMA HIROTADA
YOSHITAKE AKIRA
MUKAI CHUKICHI
ONO HIROYUKI
