Study on Control Strategy of Three Phase High Power Factor PWM Rectifier

摘要

The control strategy for three-phase-high-powerfactor PWM rectifier is studied, and the methodology of building the small signal model of the main power circuit is proposed in this paper. High frequency model for the rectifier mentioned and the input-to-output transfer function for the system are deduced with analysis. Design principle and method of the voltage regulator are given based on the model built. In d-q reference frame, the input current and voltage is DC, so PI controller can completely implement current tracking down the programmed current given, and achieve the unity power factor in grid side. At the end of the paper, experimental results verify the validity of the control strategy proposed.