The ip-iqharmonic current test method based on the instantaneous reactive power theory is analyzesd and evolved. The precision of harmonic instruction current depends on the test precision of fundamental active current. To detect the fundamental active current without delay and error

a new method based on non-harmonic detection under SPWM control strategy is proposed. MATLAB/Simulink is used to contrast ip-iqcurrent test method and the proposed method

and the compensation performance of the proposed method is verified via changing the parameter of inductance. Simulation results show the superiority of the proposed method. This study may provide an effective way of improving filtering effect and optimizing control strategy.