基于滑模变结构的永磁同步电机直接转矩控制

PMSM DTC based on variable structure sliding mode

为解决传统永磁同步电机的直接转矩控制中存在的磁链和转矩脉动以及在低速运行时性能差的问题,采用了一种基于滑模变结构控制的控制方案。用转矩和磁链的滑模控制器来替代传统的滞环比较器,采用连续函数替代常规的开关切换函数,从而实现提高趋近速度的同时消除系统抖振。通过建立数学模型,用MATLAB/Simulink对其进行了仿真和研究。仿真结果表明,对比传统直接转矩,该方法能更有效地抑制磁链和转矩脉动,提高了直接转矩的静态、动态性能和鲁棒性。

To solve those problems associated with conventional direct torque control (DTC)of permanent magnet synchronous motor(PMSM),such as high flux and torque ripple.A new direct torque control strategy of variable structure sliding mode(VSS)was proposed.The traditional hysteresis comparator is replaced by the VSS of torque and flux chain,and the conventional switching function is replaced by the continuous function.Thus,the buffeting of the system can be eliminated while increasing the approaching speed.It is simulated and studied by the mathematical model and Matlab/Simulink simulation.The results show that compared with the traditional direct control,the proposed method can suppress flux and torque ripple more effectively,improve the dynamic performance and robustness of the direct torque.