The phase difference between the grid voltage and current in grid-connected current source inverter is affected by the PI controller parameters, filter inductor and equivalent resistance. To eliminate the phase difference, three phase compensation strategies are proposed: phase compensation based on phase detection, phase compensation based on output power detection, and filter inductance regulation. The inverter mathematical model is established firstly. Then, the compensation principle and its parameters design method are given. Finally, the feasibility and effectiveness of the proposed strategies in eliminating phase difference and improving power factor are verified by using the Matlab/Simulink simulation model and experimental platform.

grid-connected current source inverter; phase difference; phase compensation; mathematical model; power factor