为了克服异步电动机直接转矩控制中转矩和电流脉动大等缺点,设计改进的自抗扰速度控制器取代传统的比例积分(PI)控制器。根据异步电动机的数学模型以及滑模变结构控制理论设计了一种基于转矩误差和磁链平方误差的新型滑模控制器。考虑电机运行过程中负载转矩未知问题,设计了一种基于Supertwisting算法的负载转矩观测器。Supertwisting定子磁链观测器的应用提高了观测精确度。通过效率优化计算得出稳态时最优定子磁链,并将其引入调速系统。仿真试验结果表明,该控制策略有效地减小了转矩和电流脉动,并且对外部扰动具有较强抑制作用,同时能够降低电机运行损耗,具有良好的动态和稳态性能。

In order to overcome the disadvantages of large torque and current ripple in direct torque control of induction motor, an improved active disturbance rejection control (ADRC) speed controller was designed to replace the traditional PI controller. According to the mathematical model of induction motor and sliding mode variable structure control theory, a new sliding mode controller based on torque error and stator flux squared error was designed. In order to estimate the applied load torque and reduce the system uncertainties, a load torque observer based on supertwisting algorithm was designed. Supertwisting stator flux observer was designed to improve the observation accuracy. The steadystate optimal stator flux was obtained through optimization calculation and introduced into the speed regulation system. Simulation results showed that this control strategy could effectively reduce torque and current ripple, and had inhibitory effect on external disturbance. At the same time, it could reduce the motor running loss, and had good dynamic and steadystate performances.

TM 343

国家自然科学基金项目(61573203,61573204,61703222)