基于改进滑模策略永磁同步电机SVM-DTC控制

传统的永磁同步电机直接转矩控制采用双滞环结构，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两个PI调节器，两个调节器的参数设计比较复杂，且直接影响了电机性能。提出用快速终端滑模（FTSM）控制器来代替传统PI转速调节器,为了克服滑模带来的抖振，设计负载转矩观测器，并将观测值反馈至滑模控制器。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，抗干扰能力增强，同时SMC固有抖振现象得到有效抑制。

SVM-DTC System for PMSM Based on a Novel Sliding Mode Controller

The traditional direct torque control (DTC) of permanent magnet synchronous motor 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 are included in traditional SVM method, one is speed regulator and the other is torque regulator. Design of Parameters of the two PI regulators is complex and the motor performance is affected by these Parameters directly. The paper used fast terminal sliding mode (FTSM) controller to replace the speed PI regulator. In order to reduce the chattering of sliding mode, a load torque observer which the observation used in the sliding mode control is designed. The simulation and experiment results show that the proposed control method can improve the dynamic and static performance of the system, and the system has a great immunity. In the same time, the inherent chattering phenomenon is effectively suppressed.