BIPOLAR PHOTOVOLTAIC SYSTEM, POWER SUPPLY SYSTEM AND REDUNDANCY PROTECTION METHOD

This application discloses a bipolar photovoltaic system, a power supply system, and a redundancy protection method. The photovoltaic system at least includes: a first output end, a second output end, and a third output end of a power converter are respectively connected to a first end of a positive direct current bus, a first end of a neutral bus, and a first end of a negative direct current bus; a first input end and a second input end of a first inverter are respectively connected to a second end of the positive direct current bus and a second end of the neutral bus; a first input end and a second input end of a second inverter are respectively connected to a second end of the neutral bus and a second end of the negative direct current bus; a first controller outputs a first overvoltage alarm signal when at least one of the following conditions is met; a second controller outputs a second overvoltage alarm signal when at least one of the following conditions is met; and the at least one condition includes: a to-ground voltage of the positive direct current bus is greater than or equal to a preset threshold, a to-ground voltage of the negative direct current bus is greater than or equal to the preset threshold, or a to-ground voltage of the neutral bus is greater than or equal to the preset threshold. In this way, timely redundancy protection is provided when a fault occurs in the system.