基于模糊滑模策略永磁同步电动机直接转矩控制

The DTC System of PMSM Based on Fuzzy and Sliding Mode Strategy

传统的永磁同步电动机直接转矩采用双滞环控制,因而电机转矩和磁链脉动较大。SVM控制方法通过合成最合理的电压矢量对转矩和磁链作精确补偿,能够一定程度上降低二者的脉动,但传统SVM控制方法包含了转速和转矩2个PI调节器,2个调节器的参数设计比较复杂,且直接影响了电机性能。用快速终端滑模(FTSM)控制器来代替转速PI调节器,为了克服滑模控制的不足,引入了模糊控制策略。仿真和实验结果表明所提控制方法改善了系统的动静态性能,降低转矩和磁链脉动,抗干扰能力增强,鲁棒性好。

The traditional DTC of PMSM adopts double hysteresis control, thus the motor torque and stator linkage flux ripple are large. SVM control method is based on the accurate compensation of stator flux linkage and torque by synthesizing the most reasonable voltage vector, so it can reduce the ripple to a certain extent. However, two PI regulators were included in traditional SVM method, one was speed regulator and the other was torque regulator. Design of parameters of the two PI regulators was complex and the motor performance was affected by these Parameters directly. The paper used fast terminal sliding mode （FFSM） controller to replace the speed PI regulator. In order to improve the precision of sliding mode con- trol, fuzzy control strategy was used. According to the proposed control method of simulation and experiment results show that the method can improve the dynamic and static performance of the system, and the system has a great immunity.