基于负载角控制的直接转矩控制系统研究

Research of Direct Torque Control Based on the Load Angle Control

介绍了一种空间电压矢量调制直接转矩控制新方法。通过对转矩偏差进行PI调节,获得下一周期的负载角,结合转子磁链的位置得到期望的定子磁链矢量。利用空间电压矢量调制技术实现对逆变器电压状态的控制。仿真表明,该系统能够更好地控制定子磁链和转矩的脉动,具有良好的性能。

A novel direct torque control scheme based on space vector modulation （SVM） is proposed. With adjusting the torque error by a PI controller,the load angle of next sample period is calculated. Combined with the rotor flux position, the anticipant stator flux vector is obtained. The switch signals of the inverter is generated by SVM technique. Simulation results show that this system can effectively reduce the ripple of motor torque and stator flux,especially at lower speed range.