Patent ID: 8401707
Filing Date: 2013-03-19
Classification: H02J

Abstract:
1. An output-power control apparatus which is provided in an electric power system connecting a secondary battery provided with a power converter for controlling electric charge/discharge and a power generator in parallel and controls a total output power as a total of output powers from the power generator and the secondary battery, wherein the electric power system is connected to a load, and wherein the output-power control apparatus comprises: a total-output-power-instruction output unit which outputs a total-output-power instruction for controlling the total output power; a power-generator-output-power detection unit which detects the output power from the power generator; a secondary-battery-charge/discharge-power instruction calculation unit which calculates a secondary-battery-charge/discharge power instruction for controlling an electric power to be charged to or discharged from the secondary battery, based on the total output power instruction output by the total-output-power-instruction output unit and based on the output power from the power generator detected by the power-generator-output-power detection unit; a secondary battery control unit which controls the power converter, based on the secondary-battery-charge/discharge power instruction calculated by the secondary-battery-charge/discharge-power instruction calculation unit; a load-power detection unit which detects an electric power supplied for the load; a total-output-power detection unit which detects the total output power; a correction-amount calculation unit which calculates a correction amount for correcting the secondary-battery-charge/discharge power instruction calculated by the secondary-battery-charge/discharge-power instruction calculation unit, based on the total output power detected by the total-output-power detection unit and based on the total-output-power instruction output by the total-output-power-instruction output unit; a secondary-battery-charge/discharge-power correction unit which corrects the secondary-battery-charge/discharge power instruction calculated by the secondary-battery charge/discharge-power instruction calculation unit, based on the correction amount calculated by the correction-amount calculation unit; and a power-generator-output power limit unit which limits the output power from the power generator to a smaller one of a total electric power and a rated output of the power generator by comparing the total electric power and the rated output with each other, the total electric power being a total of the total output power depending on the total-output-power instruction which is output by the total-output-power-instruction output unit and an electric power which is chargeable in the secondary battery; wherein: the secondary-battery-charge/discharge-power instruction calculation unit calculates the secondary-battery-charge/discharge power instruction, based on the electric power detected by the load-power detection unit; and the secondary battery control unit controls the power converter, based on the secondary-battery-charge/discharge power instruction corrected by the secondary-battery-charge/discharge-power correction unit.