Research and Implement on the Combined Control for the Current Tracking in Grid-connected Inverter

Aiming at the dependence on the system parameters and poor robustness for the deadbeat control in gridconnected inverter current tracking control,a combined control is presented based on repetitive control and deadbeat control in the inverter which combines photovoltaic grid-connected and active power filter.The combined control can eliminate the periodic distortion of the grid current when the system parameters changed and improve the steady state characteristics.The deadbeat control and the repetitive control are analyzed,the simulation results and the experimental results present that the combined control can improve the transient and steady state responses of the inverter perfectly.