PHOTOVOLTAIC INVERTER AND CORRESPONDING SWITCHING FREQUENCY CONTROL METHOD

A photovoltaic inverter is provided, including an inverter circuit, a data sampling module, and a control module. The inverter circuit includes a switch component and an alternating current output terminal. The data sampling module is configured to collect, from the alternating current output terminal, an instantaneous current value at each sampling point moment in target sampling duration and an instantaneous value of each-phase current at a target moment. The control module is configured to: determine a valid current value of the target sampling duration based on the instantaneous current value at each sampling point moment, determine an upper switching frequency limit and a lower switching frequency limit of an Nswitching period based on the valid current value, and determine a target instantaneous current value Ibased on the instantaneous value of each-phase current at the target moment.