Novel Quasi Direct Power Control for Three-phase Voltage-source PWM Rectifiers With a Fixed Switching Frequency

This paper established the three-phase voltage-source pulse width modulation(PWM) rectifier mathematical models in different coordinate systems and analyzed the principle of direct power control(DPC).To alleviate the problem of variable switching frequency,a novel quasi DPC control strategy with current loop was represented through the analysis of PWM rectifier instantaneous power.The novel control strategy was proved feasible by the Matlab/Simulink simulation results.The 50?kVA three-phase voltage-source PWM rectifier control experiment system was designed using PM300DVA120 intelligent power module(IPM),the excellent experiment results were given at the 10?kHz switching frequency with 5??s dead time.The experimental results indicate that the PWM rectifier system achieves unity power factor operation and has better performance of dynamic and static response compared to the present space vector modulation(SVM) DPC fixed-frequency control method.