无速度传感器永磁同步电机低脉动直接转矩控制

Low Ripple Sensorless Direct Torque Control for Permanent Magnet Synchronous Motor

传统永磁同步电机直接转矩控制系统的定子磁链、电磁转矩脉动较大,这些脉动在影响系统性能的同时,也影响电机参数的辨识精度。为实现永磁同步电机的低脉动无速度传感器直接转矩控制,采用EKF(扩展卡尔曼滤波器)构建电机转速、定子磁链观测器,以实现电机转速等参数的实时在线观测;构建转矩、磁链SMC(滑模控制器)取代传统DTC(直接转矩控制)中的滞环比较器和开关表以降低脉动。结果表明,无速度传感器永磁同步电机低脉动直接转矩控制能有效地降低电机转矩、磁链脉动,改善系统控制性能,同时,能实现永磁同步电机变量的快速、精确观测。

The stator flux, electromagnetic torque ripple is high in traditional direct torque control for permanent magnet synchronous motor, and the system performance is affected by this ripple. At the same time, the precision of motor parameters is affected. In order to realize the permanent magnet synchronous motor（PMSM） drive with low ripple of speed sensorless direct torque control, an EKF（Extend Kalman filter） observer is established to obtain the motor speed and stator flux linkage, which the motor parameters can be real-time observed. To reduce the ripples on flux linkage and torque, traditional current hysteresis band control is replaced by SMC（Sliding Mode Control）. Simulation results indicate that low ripple for permanent magnet synchronous motor sensorless direct torque control can reduce the motor torque and flux pulsation effectively, the system control performance are improved, and permanent magnet synchronous motor parameters can be fast and accurate observed.