CONVERTER CONTROL METHOD, CONVERTER, AND PHOTOVOLTAIC POWER GENERATION SYSTEM

This application relates to a converter in a photovoltaic power generation system and a converter control method. An input end of the converter is connected to at least one photovoltaic module, and an output end is connected to an inverter. The control method includes: determining an output PV curve of a converter based on an output power-voltage (PV) curve of the photovoltaic module; and controlling a voltage output of the converter based on the output PV curve. The output PV curve includes at least a simulated voltage limiting section and a constant power section that are connected. The simulated voltage limiting section means that an output voltage that is of a transformer and that corresponds to any point in the section is proportional to an output voltage of the photovoltaic module and there is a same proportional coefficient. The constant power section means that any two points in the section correspond to different output voltages and a difference between output powers corresponding to any two points in the section is less than a first preset threshold. In this application, an existing MPPT control policy of the inverter can be adapted when a voltage-limited output is implemented, to avoid a case in which a power of a photovoltaic string drops to zero.