Three-phase Voltage High-power Pwm Rectifier Research And System Design,

As the development of power electronic devices and modern control theory, Three-phase Voltage-Source PWM Rectifier (VSR) is widely used. It is useful in industrial applications such as active power filter,variable speed drives.Three-phase VSR is capable of bi-directional power flow unity power factor operation and input current with low harmonic content.In this paper,the Three-phase VSR Mathematics mode based on switching function are separately setted up in three-phase stationary coordinate and two-phase synchronously rotating coordinate, and direct current control scheme for three-phase VSR is studied and simulated. From the results of simulation, this paper analysised Three-phase VSR dynamic performance and robustness when its inductance, capacitance and load are changed,then a new method about inductance calculateing has been proposed.Considering high harmonic content characteristic of the input current, a fuzzy logic current regulator base on deeply analyzing the advantages of fuzzy PI control was proposed. The fuzzy logic current regulator is used to reduce the THD of input currents and accommodation time of voltage. In order to improve the robustness and dynamic response of output voltage,a new sliding-mode voltage control regulator algorithm based on transfer function was proposed. The above two methods has been studied by simulation in MATLAB software and compared with PI control.Simulation results in MATLAB/simulink show the advantages of two proposed methods.At the last of this paper, a resolving strategy based on TMS320F2812 is proposed,including the power system design and the control system design.