Device for detecting circulating current of regenerative inverter in current substation and control method thereof

A device for detecting a circulating current of a regenerative inverter in a current substation and a method for controlling the same are provided to reduce a conversion time of the inverter into first and second operation modes by allowing the circulating current with a predetermined value in a standby mode. A device for detecting a circulating current of a regenerative inverter in a current substation includes a DC sensing device for sensing a DC current of a diode rectifier(13). A controller(20) controls to absorb regenerative power in an AC power system stage(11) by operating the regenerative inverter only when the DC current sensed by the DC sensing device is less than an allowed circulating current.