异步电动机滑模变结构直接转矩控制

为了解决直接转矩控制中转矩脉动过大的问题,文中提出了一种新的基于滑模变结构的异步电动机直接转矩控制方案。这种控制方案采用磁链和转矩两个滑模控制器取代传统直接转矩控制中的滞环控制器减小转矩脉动,从而获得高性能的异步电动机调速系统。仿真结果表明,与传统控制方案相比,该方案可以在较大的转矩范围内减小转矩脉动,同时转速的稳态误差更小。从而大大改善了调速系统的静、动态性能。

Direct Torque Control of Asynchronous Machines Based on Sliding Mode Variable Structure

In order to solve the problems of the torque ripple in traditional direct torque control(DTC) of the asynchronous machines,a new method based on sliding mode control(SRM) is proposed in this paper.In place of hysteresis controllers,this Control strategy utilizes two kinds of SRM controllers to reduce the ripple torque.Simulation results show that,compared to the conventional direct torque control,this strategy can reduce the torque ripple at a large extent,,and also keep a small stable speed error in the drive of asynchronous motor.Therefore,a good statistic and dynamic performance are obtained.