Power supply control system and control method thereof

The invention provides a power supply control system (100) and a control method thereof, and belongs to the field of charging station control. A power supply control system (100) for an electric vehicle charging station with an energy storage system (30), the power supply control system (100) comprising: a transformer (10) connected with a power grid; the output socket (20) is connected with the transformer (10) through an alternating current line and is used for being connected with electric equipment in the electric vehicle charging station; the energy storage system (30) comprises an AC/DC bidirectional converter (31) and an energy storage battery (32) connected with the AC bus through the AC/DC bidirectional converter (31), and the energy storage system (30) is configured to switch the AC/DC bidirectional converter (31) to an inversion state when the power supply control system (100) is in an uninterruptible power supply mode; and when the voltage of the power grid is normal, electric energy is not output