BIPOLAR POWER SUPPLY SYSTEM AND CONTROL METHOD

A bipolar power supply system and a control method are provided, to improve management efficiency of controlling a neutral wire current. The bipolar power supply system includes a voltage conversion unit, an inverter unit, and a controller. The voltage conversion unit includes a positive voltage conversion apparatus and a negative voltage conversion apparatus. The inverter unit includes a positive inverter and a negative inverter. A negative output end of the positive voltage conversion apparatus and a positive output end of the negative voltage conversion apparatus are connected to a first end of a neutral wire, and a negative input end of the positive inverter and a positive input end of the negative inverter are connected to a second end of the neutral wire. The controller is configured to: detect whether a neutral wire current meets a preset current range; and control, when the neutral wire current does not meet the preset current range, the positive voltage conversion apparatus and the negative voltage conversion apparatus to change output voltages when output power remains unchanged, so that the neutral wire current meets the preset current range.