一种改进的异步电机直接转矩控制方法

An Improved Direct Torque Control of Asynchronous Machines

针对传统直接转矩控制(DTC)转矩脉动大、准确性差,及在考虑定子电阻压降时电压矢量区间选择不精确等问题,在研究定子电阻压降影响的基础上,重新划分电压矢量对定子磁链和电磁转矩作用的夹角范围,分析并指出传统DTC电压矢量选择表忽略了转矩增加的必要条件和磁链变化的临界条件,提出一种优化的十二区段控制方法及其电压矢量选择方法。通过仿真和实验验证了该控制方法的性能,与传统十二区段控制方法相比,该方法能保持高准确率,提高了转矩和转速响应,减小了转矩脉动。

In view of traditional direct torque control（DTC） torque ripple is large, the accuracy is poor, and considering the voltage vector of the stator resistance voltage drop, the interval selection of the voltage vector is not accurate. Based on the consideration of the influence of stator resistance voltage drop, the range of the angle between the stator flux and the electromagnetic torque is reclassified, the defects of the traditional DTC voltage vector selection table is analysed and pointed out, the optimization of the twelve section control method and its voltage vector selection table and implementation method is proposed.The control performance of the twelve section direct torque control method is verified by simulation.Compare with the traditional twelve section control method,experimental data show that in the case of high accuracy the optimal method is better, the torque response is faster, the torque ripple is reduced.