Grid-connected Inverter Control Strategy Based on Capacitor Voltage Error Inertia Feedback

Firstly, the mathematical model of single-phase grid connected inverter is established.Then, the mathematical derivation is carried out accord to the state space model, and the control strategy of grid-connected inverter based on capacitor voltage error inertia feedback is proposed. In this strategy, the first-order inertial feedback of capacitor voltage error is adopted to suppress the resonance peak of LCL filter, the feedforward of capacitor reference voltage is adopted to improve the tracking performance of the system, and the proportional feedforward of grid-connected voltage is used to suppress the harmonic of power grid. In addition, Simulation verify the feasibility and effectiveness of the proposed control strategy.