Design of Single Frequency Oscillation Suppression Damping Channel for Three-phase Grid-connected Inverter Covering Full Frequency Band

In order to solve the problem that the design idea of the current oscillation suppression damping channel is not clear and will affect the impedance characteristics of the non-target frequency band, the voltage feedback channel is introduced, and the channel transfer function is designed according to the sequence impedance characteristics of the three-phase grid-connected inverter itself By combining the frequency component selection module composed of digital spike filter and delayer, the voltage feedback channel only passes through the target frequency component. and the single-frequency oscillation suppression of the three-phase grid-connected inverter covering the full frequency band is realized. Verified by an example, the method has good oscillation suppression effect and relatively strong pertinence. Do not increase the risk of oscillation in non-target frequency bands.