Zheng

A model-based predictive current controller for PWM rectifier

Model-based predictive current control scheme proposed in the paper is a constant frequency unipolar PWM control algorithm that achieves a sysmetrical zero-centered current error in every switching cycle. This method is intended to choose the suitable switching instants based on assumed values for the circuit model parameters rather than the real-time measurement of the actual parameters, no feedback is necessary for this control scheme. Based on the pre-determined circuit model of the three-phase PWM rectifier bridge, the desired switching instants are continuously generated so that the supply current is regulated to follow its current reference precisely. The results of simulation verify suggested scheme.

Research of Three-phase PWM Rectifier Based on PI Control with Auto-tuning Scaling Factors

A new control scheme of three-phase voltage source is presented. Based on the conception of fuzzy control, and applying a PI fuzzy control with auto-tuning scaling factors to the voltage loop control of rectifier in order to improve the control accuracy of volts DC. The system transform function is deduced and fuzzy control rule table is also defined. The simulation and experiment results showed that the PI fuzzy control with auto-tuning scaling factors has quick response and good robustness, the influence of the variation of load is reduced