Power converter, power supply system, and black start method for power converter

A power supply system comprising:

• an upper-level controller;
• a plurality of power converters,
• a direct current end of each power converter in the plurality of power converters is configured to connect to a photovoltaic module or an energy storage battery,
• alternating current ends of the plurality of power converters are connected in parallel and then are configured to connect to a load or a power grid,
• the power converter comprises a power conversion circuit and a controller, the power conversion circuit is configured to convert a direct current into an alternating current, and the upper-level controller is configured to send a black start instruction to the plurality of power converters;
• and
• the controller is further configured to:
• during black start of the power converter, first control a voltage amplitude of the alternating current output by the power conversion circuit to be increased at a first rate, and then control the voltage amplitude of the alternating current output by the power conversion circuit to be increased at a second rate, wherein the second rate is greater than the first rate, to reduce a circulating current between the plurality of power converters.