POWER CONTROL DEVICE AND POWER CONTROL METHOD

An electric power is stably output during autonomous output. A solar panel PCS 21 converts DC voltage power into AC voltage power. The DC voltage power is output from a solar panel that generates power according to irradiation of sunlight. A charging AC/DC converter 23 converts the AC voltage power output from the solar panel PCS 21 into DC voltage power. A controller 28 controls output power of the charging AC/DC converter 23 based on a voltage value of the power output from the solar panel when supply of power from a commercial power system is stopped. For example, the present invention can be applied to a solar power generation system provided with the solar power generation panel and a storage battery.