This system can manage efficient operation control among distributed power sources without impairing their versatility. This power control system includes a power generation device (33) that generates power while a current sensor (40) detects forward power flow and another distributed power source (12), and a power control device (20) including an output unit (50) capable of outputting power from the other distributed power source (12) while the power generation device (33) and the other distributed power source (12) are disconnected from the grid. Output from the output unit (50) allows supply of dummy current to the current sensor (40), the dummy current flowing in the same direction as the forward power flow.