Photovoltaic inverter, photovoltaic system, and method for controlling discharging

A photovoltaic inverter, comprising:

• a first direct current to direct current (DCDC) converter;
• an inverter circuit;
• a first discharging circuit;
• and
• a controller, wherein
• the first DCDC converter is connected to a photovoltaic array at an input side of the first DCDC converter, and is connected to an input side of the inverter circuit at an output side of the first DCDC converter;
• a port capacitor is connected between a positive input end and a negative input end of the first DCDC converter, wherein the port capacitor comprises an X capacitor and a first group of Y capacitors;
• the first discharging circuit is connected between a common terminal of the first group of Y capacitors and a direct current bus, wherein the common terminal of the first group of Y capacitors is grounded;
• the controller is configured to control, when receiving a rapid shutdown instruction, the first discharging circuit to operate;
• and
• the first discharging circuit is configured to discharge electrical energy of the port capacitor.