Method for optimizing and controlling grid-connected inverter based on double filter power grid voltage feed-forward

The invention discloses a method for optimizing and controlling a grid-connected inverter based on double filter power grid voltage feed-forward. The method comprises the following steps of: collecting voltage and current at PCC point and capacitor current of a LCL (Longitudinal Conversion Loss) filter; extracting phases of voltage at the PCC point and multiplying a given incoming current value toobtain a given reference signal of the incoming current; outputting a feed-forward signal by passing the voltage at the PCC point through a power grid voltage feed-forward link corrected by a doublefilter link; comparing the given reference signal with the current at the PCC point to obtain an error signal, and adjusting the error signal by a current regulator to obtain a command signal; comparing the command signal with the collected capacitive current signal and the feed-forward signal to generate a modulated signal, and comparing the modulated signal with a triangular carrier to generatea PWM (Pulse Width Modulati