This paper studies the control strategies of three-phase high power factor PWM rectifier. The mathematical model for the rectifier is analyzed in detail. The control strategies in synchronously rotating d-q frame and two-dimensional stationary (α-β) frame are introduced respectively. By analyzing the control procedure in mathematics and the simulation results of MATLAB, the paper analysis two typical control strategies and indicates the relative merits of them. Finally, the experimental prototype of the three-phase PWM rectifier using the predictive current control strategy is designed in laboratory, and the results are provided to verify the superiority in high power factor PWM rectifier.
The paper describes a microcomputer control system, which uses the floating-point digital signal processor TMS320LF2407 from Texas Instruments, for three-phase PWM rectifier. It could effectively eliminate harmonic distortion of line currents and provides power factor correction. Moreover, it can be save electrical energy and reduction of production cost. In the control system, the predictive current control in two-dimensional (α-β) stationary frame, makes the input current following the phase voltage in phase to get unity power factor; and space vector pulse wide modulation (SVPWM) generates the modulation wave. Finally, the three-phase PWM rectifier using the proposed control system is designed in Simulink/Matlab and executed in laboratory prototype, and the results are provided to verify the proposed control system in the end of the paper
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