基于滑模变结构的异步电机调速系统建模与控制

Modeling and Control of Asynchronous Motor Speed Control System Based on Sliding Mode Variable Structure

针对基于传统矢量控制的异步电机调速系统存在响应速度慢、鲁棒性弱等方面的不足,在推导三相异步电机简化模型的基础上,设计了一种将滑模变结构与矢量控制相结合的控制方法,用滑模变结构控制方法取代矢量控制中的转速调节器,基于指数趋近方法求得了系统控制器,利用李雅普洛夫判据证明了系统的渐进稳定性。进一步地,在Simulink环境下建立电机调速系统模型,通过对比传统PI矢量控制与结合滑模变结构的矢量控制方法的仿真结果,说明该方法应用于异步电机调速控制中具有响应速度快,鲁棒性强等优点。

Aiming at the deficiencies of the asynchronous motor speed control system based on the traditional vector control,such as slow response speed and weak robustness,on the basis of derived the simplified model of the three-phase asynchronous motor,a control method which was combined with sliding mode variable structure control and vector control was designed.The sliding mode variable structure control method was used to replace the speed regulator in the vector control,the system controller was obtained based on the exponential approach method,and the asymptotic stability of the system was proved by using the Lyapunov criterion.Furthermore,the motor speed control system model was established in the Simulink environment.By comparing the simulation results of the traditional PI vector control and the vector control method combined with sliding mode variable structure,it is shown that this method has fast response speed and robustness when applied to the speed control of asynchronous motors.Strong stick and other advantages..