| The mathematical models of three-phase voltage PWM rectifier are analyzed under the different frame references, and the mathematical models based on virtual flux under and dq frame reference are presented, and the simulation modules of three-phase PWM rectifier based on MATLAB are built, and the simulation results show that the models based on virtual flux are correct and have some particular characteristics. The control tactics of space voltage vector are investigated, and the simplified algorithm which judges the sector location of reference vector and calculates switch operation time is put forward. By analyzing the current hysteresis control, the relation between switch frequency, and hysteresis bandwidth and input inductance of PWM rectifier is deduced. By applying instantaneous power theory, the principle of PWM rectifier power control is analyzed, and the Direct Power Control by MATLAB Toolbox through estimating active power and reactive power with virtual flux is realized, and the simulation results prove that it is correct. The hardware and software of double-close loop of PWM rectifier are designed in order to decouple the input current, and the simulation results show that the parameters are reasonable and the system is feasible.
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