基于模糊控制的直接转矩控制系统的仿真分析

针对感应电动机直接转矩控制中低速运行时定子电阻变化对系统性能影响较大的问题,提出了一种基于模糊PI控制的定子电阻估计方法。同时提出了一种基于模糊SVM技术的感应电动机直接转矩控制方案,该模糊控制器的输入为转矩误差、磁链误差的绝对值,输出为所选择的参考电压矢量的偏转角,最后对该方法进行仿真研究。仿真结果表明所提出的模糊直接转矩控制方案能够有效地改善感应电动机的低速性能,减小转矩脉动,并且具有很好的动态响应性能。

Abstract：

To solve the effect of stator resistance change of the low-speed performance in direct torque control （DTC） of induction motor,a method of the stator resistance estimate,based on the fuzzy-PI control was proposed.And a fuzzy-SVM controller based on the DTC of induction motor was introduced to select the reference voltage vector,which had three inputs：the absolute value of the torque error and the flux error,one output：the deflection angleη of synthesized voltage vector.Simulation was used to prove the efficiency of this method.The results of the simulation prove that the method of the fuzzy DTC controller can effectively improve the low-speed performance of the induction motor,reduce the torque ripple,and have a good dynamic response performance.