OPTIMIZER, PHOTOVOLTAIC POWER GENERATION SYSTEM, AND I-V CURVE SCANNING METHOD FOR PHOTOVOLTAIC ASSEMBLY

Embodiments of this application provide an optimizer, a photovoltaic power generation system, and an IV curve scanning method for a photovoltaic module. The photovoltaic power generation system includes a plurality of photovoltaic modules, a plurality of optimizers, and an inverter. An input end of each optimizer is connected to at least one photovoltaic module, and output ends of the plurality of optimizers are connected in series to form a string and then connected to the inverter. The optimizer includes a conversion unit, and a control unit configured to control the conversion unit. The optimizer further includes an auxiliary power source, an energy storage unit, and a first unidirectional conduction unit that are connected between the conversion unit and the control unit. The control unit is configured to perform IV curve scanning for each voltage segment, where the voltage segments are obtained by segmenting a range of an output voltage of a photovoltaic module corresponding to the optimizer from an open-circuit voltage to a preset minimum voltage, and at least two voltage segments are obtained through division. In this application, costs and a volume of the optimizer can be reduced.