Research on an improved three-phase PWM rectifier and its control strategy

Abstract

This paper presents an improved three-phase PWM rectifier with predicted current space voltage-vector pulse width modulation technology. The designed rectifier can realize controllable soft start, and has high power factor and wide voltage regulation．A new over current protection circuit is designed，which has fast response speed and can meet repetitive start requirement of high voltage supply application．Simulation and test results show that the improved PWM rectifier can achieve controllable soft start and the error in steady state is less than 2%，the recovery time is less than 0.5 s after a sudden change of the load，the power factor is more than 95%．

Keywords

• high-voltage power supply
• three-phase PWM rectifier
• predictive current control
• SVPWM
• power factor correction