永磁同步电机的滑模PI模糊逻辑控制

Fuzzy Logic Control by Combining SMC and PI for PMSM

PI控制因结构简单,容易实现,稳态性能好等优点,而被广泛应用于以矢量控制为核心控制算法的永磁同步电机控制系统中,但其缺点是快速响应和超调之间存在矛盾,控制性能易受外界扰动和电机参数变化的影响。滑模控制有较好的动态性能,但抖振问题限制了其在实际系统中的应用。针对永磁同步电机伺服系统,提出了基于模糊-滑模-PI混合控制的速度控制算法,并对常用的模糊线性切换函数进行了改进,引入了非线性切换函数实现了平滑切换,在满足系统动态响应,增强系统鲁棒性的同时,又很好地解决了抖振问题。最后,通过仿真和实验验证了所提出的算法的正确性和实用性。

The advantage of proportional plus integral （PI）is the simple construction, easy to implement and superior in the steady-state condition, the drawback is the contradiction between the fast response and the overshoot, and the PI is vulnerable to the system parameter variations and any external disturbances. Sliding mode control （SMC） is better under transient conditions,but the existence of chattering limits its application in practical engineering. A way of combining SMC and PI which is used in the PMSM servo systerm was proposed, it can smooth transition by fuzzy logic,to the traditional fuzzy linear switching function, a nonlinear switched function was introduced and has a smoothly transition, it can satisfy the dynamic response, enhance robustness and can also solve the chattering problem. At last, the simulation and real experiment results show that the method is correct and practical.