基于虛擬磁鏈定向矢量控制的三電平PWM整流器仿真研究

摘要：PWM整流器與交流電機的定子電路有很大的相似性，采用交流電機磁鏈觀測的方法構造出虛擬的電網磁鏈矢量，作為PWM整流器矢量控制中的定向矢量，可以達到取消交流側電網電壓傳感器降低PWM整流器硬件成本的目的。根據交流電機磁鏈觀測器的設計方法,設計了虛擬電網磁鏈觀測器,并構造了基于Matlab/Simulink的三電平PWM整流器虛擬電網磁鏈定向矢量控制的仿真模型。仿真結果驗證了觀測器的可靠性和控制方案良好的動靜態特性。 敘詞：三電平 PWM整流器 虛擬磁鏈控制 Abstract：The main circuit of the PWM rectifier is similar to that of an AC machine fed by an inverter. So a virtual line flux has been constructed to serve as the oriented vector instead of the line voltage vector to re-move the AC voltage sensors and reduce the cost of PWM rectifiers. A simple virtual line flux observer is proposed based on the method used in AC machines. A simulation model of the AC voltage sensorless virtual line flux oriented vector control of PWM rectifier has been established using Matlab/Simulink. Good steady and dynamic characteristics of this control scheme have been shown by simulation results. Keyword：Three-level, PWM Rectifier, Virtual line flux control