GRID-TIED INVERTER APPARATUS AND GRID-TIED CONTROL METHOD

This application provides a grid-tied inverter apparatus and a grid-tied control method. The inverter apparatus includes an inverter circuit, a controller, and a filter circuit. The controller is configured to adjust switching frequencies of a plurality of power switching transistors based on an output current value of the inverter apparatus, to adjust a resonance frequency of the filter circuit through different resonant branches, so that the resonance frequency meets a grid-tied requirement. In this application, when the switching frequencies of the plurality of power switching transistors in the inverter circuit are reduced due to overload of a power supply system, resonance may be produced through different resonant branches, to adjust the resonance frequency of the filter circuit in a timely manner, so as to ensure that the resonance frequency of the filter circuit meets a requirement for system stability. A response is fast, and a control method is simple, so that system stability and security are improved, and applicability is high.