永磁同步电机调速系统新型滑模变结构控制策略

Control Strategy of New Sliding Mode Variable Structure on Speed Regulation System of Permanent Magnet Synchronous Motor

为解决在永磁同步电机矢量控制系统转速环环节应用传统PI控制时抗干扰能力和控制精度不足的问题,在传统滑模指数趋近律基础上进行改进,将滑模面作为自变量,引入双曲正切函数设计了一种新型变边界层饱和函数代替传统的符号函数,在提高系统响应性的同时削弱了抖振。针对系统参数和负载转矩变化引起的扰动会使系统再次产生抖振的问题,引入双曲正切函数和Fal函数构成复合函数,设计了一种新型扰动观测器,并将观测结果反馈至滑模控制器,进一步提高了系统的鲁棒性。最后通过仿真和试验证明了该算法的可行性和有效性。

In order to solve the problem of insufficient anti-interference ability and control accuracy when applying traditional PI control in the speed loop link of the permanent magnet synchronous motor vector control system,the traditional exponential sliding mode reaching law is improved in this paper,the sliding mode surface is used as the independent variable,and a new type of variable boundary layer saturation function is designed based on the hyperbolic tangent function to replace the traditional symbolic function,which improves the system response and weakens chattering.Then,to prevent the system from generating chattering again caused by disturbance as a result of the changes of system parameters and load torque,the hyperbolic tangent function and Fal function are introduced to design a new disturbance observer and feedback the observed results to the sliding mode controller,which further improves the robustness of the system.Finally,simulation and experimental results both prove the validity and feasibility of the new sliding mode control algorithm.