A Harmonic Current Suppression Method for Single-Phase PWM Rectifier Based on Feedback Linearization

Abstract

This paper presents a harmonic current suppression method based on feedback linearization for single-phase voltage source pulse width modulation (PWM) rectifier, which can achieve fast dynamic response and low total harmonic distortion (THD). Starting from the state space model of single-phase PWM rectifier, by introducing feedback linearization method and by means of coordinate transformation and state feedback, a precise linearization model is attained and a feedback linearization based current controller is designed. Considering that the instantaneous power of the single-phase rectifier pulsates at twice the grid frequency, which results in a large number of harmonic currents, a notch filter is added in the voltage PI loop to reduce the second harmonic component of the inductor current amplitude reference. In addition, in order to further reduce the current harmonic, a sliding mode controller is designed for the inner loop. Finally, the simulation results prove the effectiveness of the proposed method.