一种改进的空间矢量调制的异步电机直接转矩控制系统

摘要

Direct Torque Control ( DTC) of induction motor is known to offer fast instantaneous torque and flux control with a simple control structure. However, this scheme due to the use of hysteresis comparators, has two major disadvantageous namely variable inverter switching frequency and high torque and flux ripple. In this paper, an improved SVM-DTC method is proposed, while maintaining the traditional method of simple structure, the advantages of fast torque response, while dramatically reducing the torque and flux ripple.%传统的异步电机直接转矩控制具有控制结构简单、控制手段直接、转矩响应迅速等优点,但是由于是由两个滞环比较器选择开关矢量,带来了开关频率不固定、转矩和磁链脉动大的不足.因此提出了一种改进的基于空间矢量调制的直接转矩控制方法,在保持传统方法结构简单、转矩响应迅速等优点的同时,极大地减小了转矩和磁链的脉动.