Photovoltaic system and circulating current suppression method

A method for a photovoltaic system, wherein the photovoltaic system comprises at least two inverters, a direct current input terminal of each inverter is connected to a corresponding photovoltaic array, alternating current output terminals of the at least two inverters are connected in parallel, the at least two inverters comprise a positive inverter group and a negative inverter group, the positive inverter group comprises at least a first inverter and a third inverter, and the negative inverter group comprises at least a second inverter and a fourth inverter;

• a negative direct current input terminal of the first inverter is connected to a positive direct current input terminal of the second inverter;
• a negative direct current input terminal of the third inverter is connected to a positive direct current input terminal of the fourth inverter;
• and alternating current output terminals of the first inverter and the third inverter are connected in parallel, and alternating current output terminals of the second inverter and the fourth inverter are connected in parallel, and the method comprises:
• obtaining a direct current component of a common-mode output current of at least one of the at least two inverters;
• and
• adjusting a direct current bus voltage of the corresponding inverter based on a magnitude of the direct current component of the common-mode output current, to suppress a circulating current between the at least two inverters.