Research On Single Phase High Efficiency And High Power Factor PWM Rectifier

When the traditional PWM rectifier works, the switching devices usually conduct in high voltage and turn off in high current, so there is a large switching loss and serious electromagnetic interference problem. This paper adopts zero current switching(ZC T) technology to improve the efficiency of PWM rectifier.The single-phase ZCT soft switching PWM rectifier is the auxiliary resonant branch introduced in the single-phase PWM rectifier topology, so this paper firstly analyzes the basic principle of the single-phase PWM rectifier, working process and mathematical model, and based on this, composition and principle of ZCT soft switch are analyzed. Because auxiliary resonant branch is independent each other, so the control strategy for PWM rectifier will not effect in the introduction to the main topology of rectifier, the single-phase ZCT soft switching PWM rectifier still can use the conventional PWM control strategy. Therefore, the conventional PWM control strategy are respectively compared in this paper. the main circuit parameters of single-phase ZCT soft switch PWM rectifier are designed and the system provides the theory basis for the simulation main circuit parameter setting.Finally, using Simulink to build the experiment simulation platform, the single-phase ZCT soft switch PWM rectifier single bridge arm is simulated, and verified the correctness of the analysis of the woring process of the ZCT soft switch. On the basis of the simulation for single bridge arm, the single-phase ZCT soft switch PWM rectifier system is simulated, and the functional simulation model are described. Respectively, instantaneous direct current control and the predictive current control are analyzed and compared with simulation results, also doing simulation analysis for the system power factor and efficiency, and draw the relevant conclusion.