PHOTOVOLTAIC SYSTEM AND CIRCULATING CURRENT SUPPRESSION METHOD

This application provides a photovoltaic system and a circulating current suppression method. The system includes a controller and 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 controller is configured to: obtain a direct current component of a common-mode output current of at least one of the at least two inverters, and adjust 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. In this technical solution, a circulating current between a plurality of inverters connected in parallel can be suppressed, thereby reducing loss caused by a circulating current, and improving power supply efficiency. In addition, leakage current mis-protection and overcurrent protection caused by a circulating current can also be avoided. An excessively large circulating current may further damage a power device in an inverter. Therefore, in this embodiment of this application, a power device can be protected from impact of a circulating current.