一种无差拍直接转矩控制方法

针对现有的感应电动机无差拍直接转矩控制方法计算比较复杂,且计算得到的两个控制电压与控制对象磁链和转矩不是一一对应的问题,提出了一种在定子磁场定向的同步旋转坐标系下进行无差拍直接转矩控制计算方法.由d轴磁链方程推导出磁链无差拍控制电压的计算式;利用和定子磁链相垂直的q轴电流方程,推导出转矩控制电压计算式.计算出的电压矢量由空间电压矢量脉宽调制方法实现.这种方法计算简单,不需要解二次方程,分离的磁链和转矩控制计算有利于控制安排.对采用这种方法的直接转矩控制系统进行仿真表明,系统转矩控制和磁链控制响应快,对参数的变化不敏感.

Deadbeat direct torque control of induction motor

The methods currently used for calculation of the deadbeat direct torque control are complex and need to solve a quadratic equation. Furthermore, the calculated control voltages have multi - connections with the control objectives, that is, flux and torque. To deal with these problems, a new deadbeat direct torque control method is proposed, which performs the necessary calculation on a synchronous rotating frame with the d axis align with the stator flux. Based on the induction motor equations on the frame mentioned above, the formula to calculate the flux control voltage can be got from the flux equation of d axis, and the formula to compute the voltage for deadbeat torque control is deduced from the current equation of the q axis. The voltages are realized by SVM - PWM. This method is simple and does not need to solve a quadratic equation. The simulation results of this kind of deadbeat direct torque control system show fast torque and flux responses, and the system is not sensitive to the parameter variation.