变结构速度控制器设计

Design of variable structure speed controller of direct torque control

为了实现交流感应电机的速度及转矩的实时高精度控制,设计了一种滑模变结构直接转矩速度控制器。应用可变边界层法削弱滑模面上的抖振,用模型参考自适应速度辨识器取代传统速度传感器监测电机速度。通过仿真表明:可变边界层法削弱抖振效果优于等速趋近率法,系统在参数变化情况下能表现出较强的鲁棒性,改善了电机的动态和静态性能。

In order to realize high accuracy of real-time control of speed and torque, a kind of DTC speed controller based on sliding mode variable structure is designed. Variable boundary layer solution is applied to eliminate chattering on the sliding surface and PI speed identifier of MRAS is used to replace traditional speed sensor to monitor the speed. Simulation and experimental results show that the effect of variable boundary layer solution in eliminating chattering is better than the equal near rate control law, and the robustness against oarameter change of induction motor is improved and the static and dynamic performance is desirable.