基于磁链误差矢量预测的PMSM直接转矩控制

为了抑制磁链和转矩脉动引入了磁链误差矢量预测，在分析永磁同步电动机（PMSM）直接转矩控制基本原理的 基础上，结合空间矢量调制思想，提出了一种通过预测磁链误差矢量的改进型直接转矩控制（FEV-DTC）策略，将转矩误 差经过一个PI控制器之后作为磁链旋转速度的参考值，与磁链给定值结合成为预测的磁链差值矢量，然后计算应采用的 电压矢量.电压矢量用空间矢量调制（SVM）方法实现.仿真和实验结果表明，与基本直接转矩控制（DTC）相比，FEVE- DTC能显著减小磁链和转矩脉动，具有更优越的运行性能.

Direct torque control of permanent magnet synchronous motor based on flux error vector estimation

A modified DTC based on flux error vector estimation(FEVE-DTC) was proposed to reduce torque and flux ripples.The FEVE-DTC calculates the error of flux and determines the voltage space vector at the next sampling time,and then modulates the voltage vector with an SVM(space vector modulation)unit.A PI unit was employed to estimate the reference speed of stator flux linkage.From the reference amplitude and the reference speed,the flux error vector could be calculated.A voltage vector proportional to the flux error vector was calculated by the SVM unit.Modeleing and experimental results showed that the torque and flux ripples were significantly reduced without drawing much back of dynamic characters,current distortion is also reduced with a lower sample frequency compared with that of basic DTC.