Inverter of grid-connected photovoltaic power generation system, startup apparatus, method, and system

A startup apparatus for starting an inverter, wherein the inverter comprises a grid-connected inverter unit and an alternating current auxiliary power supply, an input terminal of the grid-connected inverter unit is connected to a bus capacitor, and the alternating current auxiliary power supply is configured to convert an alternating current of an alternating current power grid into a direct current;

• and
• the startup apparatus comprises a control unit and a startup unit, wherein
• the control unit is configured to:
• when a start instruction is received, send a start power obtaining instruction to the startup unit;
• and
• the startup unit is configured to obtain power from the alternating current power grid or obtain power from the alternating current auxiliary power supply according to the start power obtaining instruction, and provide the alternating current or the direct current to the bus capacitor, to start the grid-connected inverter unit.

A grid-connected photovoltaic power generation system, comprising an inverter and a boost circuit, wherein

• the inverter, comprising a grid-connected inverter unit, an alternating current auxiliary power supply, and a startup apparatus, wherein
• the alternating current auxiliary power supply is configured to convert an alternating current of an alternating current power grid into a direct current;
• an input terminal of the grid-connected inverter unit is connected to a bus capacitor;
• the startup apparatus is configured to:
• obtain an alternating current from the alternating current power grid, convert the alternating current into a direct current, and provide the direct current to the bus capacitor, to start the grid-connected inverter unit;
• or obtain a direct current from the alternating current auxiliary power supply and provide the direct current to the bus capacitor, to start the grid-connected inverter unit;
• and
• an input terminal of the boost circuit is connected to a solar panel, an output terminal of the boost circuit is connected to an input terminal of a grid-connected inverter unit in the grid-connected photovoltaic power generation system, and a bus capacitor connected to the input terminal of the grid-connected inverter unit is an output capacitor of the boost circuit;
• and
• the boost circuit is configured to boost a voltage output from the solar panel.