Research on the single-phase PWM rectifier based on the repetitive control

This paper presents a novel digital control scheme for single-phase PWM rectifier for reducing AC-side harmonic currents and improving power factor. The proposed inner current loop is a predictive controller with a plug-in repetitive learning controller, it can achieve zero tracking error and simultaneously hold a fast response with the DC load disturbance. A digital notch filter is added to the outer DC voltage loop to reduce the effect of the DC voltage 2^nd harmonic to the AC current, comparing to the low-pass filter, it will not affect the dynamic response of the whole system and suppress the harmonic signal more severely. Simulations and experiments are carried out for this system and the results shows the feasibility and effectiveness of the proposed scheme.