Power Supply Device

Abstract: In the present invention, a first power converter (7) selectively executes a charging operation in which a portion of first AC power from a power system (200) is converted into DC power and stored in a power storage device (130), and a discharge operation in which the DC power in the power storage device (130) is converted into second AC power. A control device (23) is communicatively connected to a server (210) that balances the power supply and demand in the power system (200). When the power system (200) is sound, the control device (23) controls the charging operation so that the power storage device (130) is in a fully charged state. If an advance notice signal of a demand response is received from the server (210), the control device (23) controls the discharge operation so as to supply the total power of the first AC power and the second AC power to a load, and stops the discharge operation in response to the SOC of the power storage device (130) having declined to a standby SOC. The control device (23) controls the discharge operation or the charging operation in accordance with a demand response command received from the server (210).

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