High Power Factor in Three-phase Voltage Source Pulse-Width ModulationRectifier Based on Direct Power Control

摘要

The conventional pulse-width modulation rectifier has the low power factor and more sensors to detect thevoltage and current of alternating current side. The traditional direct power control method possesses the defect of unfixedswitching frequency. A new method based on three-phase voltage source pulse-width modulation rectifier with high powerfactor based on direct power control is proposed in this paper. With the analysis of the formation mechanism of theswitch table, the stationary coordinate is divided into 12 vectors to optimize the input voltages. Virtual flux estimator isintroduced to replace voltage sensors. Instantaneous power theory is used to calculate the estimated virtual flux active andreactive power with outer voltage and inner power loop control mode. The direct power control strategy of space vectormodulation is introduced to provide the fixed switching frequency on pulse-width modulation. The experimental resultsshow that the direct power control system has good dynamic response, so as to achieve active power and reactive powercontrol, which ensures that the input side of the unity power factor control. It is illustrated that this method can achievehigher power factor and total lower harmonic disturbance than the conventional current control strategy.