一种改进的异步电动机直接转矩控制方法

针对传统异步电动机直接转矩控制方法转矩及磁链脉动大、开关频率不固定的缺点,提出了一种改进的异步电动机空间矢量调制直接转矩控制方法。该方法通过转矩角闭环控制实现定子磁链幅值和相角的解耦,从而获得参考电压空间矢量,实现对磁链误差和转矩误差的控制。仿真结果表明,该方法有效地克服了传统直接转矩控制方法的缺陷,获得了良好的动态响应性能。

An improved method of direct torque control of induction motor

In view of shortcomings of traditional direct torque control method of induction motor that torque and flux linkage have large pulsation and switching frequency is unfixed,the paper put forward an improved direct torque control method with space vector modulation for induction motor.The method uses torque-angle closed-loop control to achieve decoupling of flux linkage magnitude and phase of stator,so as to obtain reference voltage space vector and realize control of flux error and torque error.The simulation results show that the method can effectively overcome the shortcomings of traditional direct torque control method,and get good dynamic response performance.