Research In High Pwer-Factor Rectifier Base On SVPWM Control

Diode rectifier and SCR rectifier are used in modern industry widely. These devices can cause vast scale of harmonic current and reactive power component that can do damage to electric network.. Not only reduce the power factor of electric network and other load but also increase the capability of electric network and increase the power loss they can. Sometimes they can affect the stability of electric network. PWM rectifier can work with sinusoidal current and in unit power factor state that eliminate the shortage of traditional rectifier. PWM rectifier enhances the development of rectifier greatly and has been concerned and used widely.This article elaborates the developments of PWM rectifier and analyzes the voltage PWM rectifier's principle succinctly. Through its mathematical model's establishment and analysis, several kinds of control strategies have been introduced. At the same time analysis and comparison have been carried on the electric current decoupled control algorithm and the predictive electric current SVPWM control algorithm, because the electric current decoupled control algorithm has more merits finally it is chose and be improved. Through the result of system simulation, the improvement has been confirmed accurate. Finally the algorithm goes through the prototypical experiments. The test result indicates that the electric current decoupled control algorithm can make the PWM rectification system have fine dynamic and static characters. After the simplification of electric current decoupled control algorithm, the control precision of PWM rectifier is not affected but the algorithm is liable to be realized and adjusted.