模糊超扭曲滑模观测器在PMSM中的研究与应用

针对传统滑模控制的永磁同步电机(PMSM)无感系统调速过程中，由于滑模函数存在高频开关量而导致转速抖动的问题，提出使用模糊超扭曲二阶滑模观测器(FST-SMO)进行改进的策略；新型观测器采用高阶滑模控制理论搭建，将滑模函数开关量转移到了高阶导数中，利用算法的积分运算削弱开关量抖振；同时考虑到传统二阶滑模观测器的增益为固定值，无法根据误差量自行调节的问题，提出了基于模糊控制的增益自调节方法，根据误差值及其变化趋势，利用模糊算法输出当前的滑模增益，增强了系统稳定性及鲁棒性；在Simulink环境中搭建了基于模糊超扭曲滑模系统(FST-SMO)的永磁同步电机仿真模型，在不同调速区间内进行调速仿真，并与传统滑模系统仿真的转速波动以及转子角度跟随性进行比较，仿真结果验证了模糊超扭曲滑模观测器具有更高的控制精度与更强的适应性，转速平稳角度跟随性能优越，有效降低转速的抖振。

Study and Application of Fuzzy Super-twisting Sliding Mode Observer in PMSM

Aiming at the problem of speed jitter caused by high-frequency switching value in the sliding mode function in the speed regulation process of permanent magnet synchronous motor(PMSM) sensorless system of traditional sliding mode control an improved strategy using fuzzy super-twisting second-order sliding mode observer(FST-SMO) was proposed. The new observer is based on the high-order sliding mode control theory, which transfers the switching value of the sliding mode function to the high-order derivative, and uses the integral operation of the algorithm to weaken the chattering of the switching value. At the same time, considering that the gain of the traditional second-order sliding mode observer is fixed and cannot be adjusted according to the error, a gain self-adjusting method based on fuzzy control was proposed. According to the error value and its change trend, the current sliding mode gain was output by fuzzy algorithm, which enhanced the stability and robustness of the system. The simulation model of permanent magnet synchronous motor based on fuzzy supertwisting sliding mode system was built in Simulink environment. The speed regulation simulation was carried out in different speed regulation intervals, and compared with the speed fluctuation and rotor angle following of traditional sliding mode system simulation. The simulation results verify that the fuzzy super-twisting sliding mode observer has higher control accuracy and stronger adaptability, the speed is stable and the angle following performance is superior, and the chattering of speed has been reduced effectively.