在基于开关表的直接转矩控制(ST-DTC)方法的基础上,通过PI调节得到补偿定子磁链和转矩误差的参考电压矢量,利用空间电压矢量调制(SVM)技术将相应的参考电压矢量转化为逆变器开关信号以实现对异步电机的控制。在Matlab/Simulink中建模仿真后发现,这一方法能固定逆变器开关频率并降低转矩和电流脉动,低速性能也较传统DTC方法更为优越,控制简单有效。
On the base of the direct torque control based on switching table ( ST-DTC), this paper uses PI adjustor to get reference voltage for compensating stator flux and torque, and then transfers the reference voltage to switch signal of inverter through space vector modulation (SVM) technology to drive the asynchronous motor. After simulation in Matlab/Simulink, it can be found that this simple method can fix the switch frequency of inverter and smooth the torque and current, the performance in low speed area is better than ST-DTC.