PHOTOVOLTAIC POWER GENERATION SYSTEM, PHOTOVOLTAIC INVERTER, AND IV CURVE SCANNING METHOD

This application relates to the field of photovoltaic power generation technologies, and provides a photovoltaic power generation system, a photovoltaic inverter, and an IV curve scanning method. The photovoltaic power generation system includes a controller and M groups of DC-DC circuits. Each group of DC-DC circuits include N DC-DC circuits, where M is a positive integer, and N is an integer greater than 1. An input end of each DC-DC circuit is connected to at least one photovoltaic unit, and each photovoltaic unit includes at least one photovoltaic module. The controller controls the N DC-DC circuits in each group of DC-DC circuits to sequentially start online IV curve scanning, and controls a time interval at which two adjacent DC-DC circuits start online IV curve scanning to be less than duration of online IV curve scanning performed by one DC-DC circuit. The photovoltaic power generation system can reduce a fluctuation of a power output during online IV curve scanning, reduce duration of online IV curve scanning performed by the photovoltaic power generation system, and further reduce impact of online IV curve scanning on grid-connected power quality.