感应电动机全局高阶滑模观测器

Global high-order sliding mode observer for induction motor

提出了一种基于高阶滑模的感应电动机全局滑模观测器,用于实现电机转速及转子磁链的高精度辨识。通过设计全局滑模面,实现了观测器在整个控制过程中均处于滑动模态,提高了观测器的鲁棒性。设计的高阶滑模控制律可以得到平滑的等效控制信号,实现了直接将滑模控制信号用于系统状态观测,提高了观测精度。仿真和试验结果表明:所设计的滑模观测器有效地抑制了抖振现象,具有良好的观测精度,并且对外部负载扰动及内部参数摄动具有较强的鲁棒性。

A global sliding mode observer for induction motor based on high-order sliding mode was proposed. The model is applied for precisely identifying the rotor velocity and the rotor flux of the induction motor. A global sliding mode surface was designed to improve the robustness of the observer and to implement the observer in the sliding motion through the entire response. A high- order sliding mode control law was utilized to obtain the smooth equivalent control signal directly. The control signal of the sliding mode observer can be applied to state observation, so that the better observing precision is realized. Simulation and experiment results show that the proposed sliding mode observer can eliminate the chattering phenomenon effectively, provide high observing precision. Moreover, the proposed observer is robust to load disturbance and internal parameter perturbation.