POWER SUPPLY SYSTEM AND CONTROL METHOD

A power supply system is described. The power supply system can include an active power contactor, a standby power contactor, an auxiliary power contactor, a control switch, and a controller. The active power contactor is connected in series in a path of a main power supply circuit, and the standby power contactor is connected in series in a path of a standby power supply circuit. The active power contactor and the standby power contactor are interlocked through the auxiliary power contactor. The auxiliary power contactor and the control switch are connected in series. The controller is configured to when the main power supply circuit is abnormal, control the control switch to change a status of the auxiliary power contactor, to switch to the standby power supply circuit, or control the control switch to change the status of the auxiliary power contactor, to switch to the main power supply circuit.