Photovoltaic power supply system and control method thereof

A photovoltaic power supply system, comprising:

• a power supply;
• and
• a photovoltaic inverter comprising a controllable switch on a direct current side, an inverter unit, a controllable switch on an alternating current side, a collector, a first controller, and a second controller,
• wherein the power supply is connected to the inverter unit through the controllable switch on the direct current side, the inverter unit is connected to a load through the controllable switch on the alternating current side, an input end of the collector is connected between the inverter unit and the load, and the input end of the collector is connected between the inverter unit and the power supply, an output end of the collector is connected to the first controller and the second controller, the first controller is connected to the controllable switch on the direct current side, and the second controller is connected to the controllable switch on the alternating current side,
• wherein the collector is configured to obtain a power supply parameter of the photovoltaic power supply system;
• wherein the first controller is configured to:
• when the power supply parameter of the photovoltaic power supply system is greater than or equal to a power supply parameter threshold, turn off the controllable switch on the direct current side, to disconnect an electrical connection between the power supply and the inverter unit, and
• wherein the second controller is configured to:
• when the power supply parameter of the photovoltaic power supply system is greater than or equal to the power supply parameter threshold, turn off the controllable switch on the alternating current side, to disconnect an electrical connection between the inverter unit and the load.