PWM整流器电流控制策略仿真比较

通过分析三相电压型PWM整流器的数学模型,建立了PWM整流器的数学模型,根据同步电动机励磁系统主回路中PWM整流电路不同的调制方法,介绍了SPWM电流控制,滞环电流控制和空间矢量控制的基本原理和三种不同控制方法下的触发方式。在MATLAB的SIUMLINK环境下对三种控制方法建立仿真模型,并对仿真结果进行了分析比较,结果表明,在空间矢量控制方法下整流器直流侧电压利用率高,降低了谐波污染,使系统更接近单位功率因数运行,从而使电机运行更加稳定,运行精度更高。

Simulation of PWM Rectifier Currents Control Strategy

By analyzing the mathematical model of three-phase voltage source PWM rectifier,establish the mathematical model of PWM rectifier. By the different methods of PWM commute circuit in the main loop of synchronous motor excitation system, this paper introduces the basic principles of SPWM current control,hysteretic current control,space vector control and the trigger methods in three different control methods.Establish the simulation model of three different control methods by using MATLAB software,then discusses the results.The results show that DC side voltage gets high utilization under the space vector control and harmonic pollution gets reduced.Ensure the system operates near the unit power factor,which make the motor more stable and higher precision of operation.