感应电机 Super-twisting 算法定子磁链观测器设计

摘要

In order to improve the observation accuracy of stator flux of induction motor,a stator flux esti-mation method based on Super-twisting algorithm was proposed.A stator flux observer was designed and applied for direct torque control of induction motor.According to the robustness of sliding mode variable structure control,the disturbance of the multiple input multiple output stator flux observer system was re-strained.By using the advantages of Super-twisting algorithm which require less information to design a simple control law,and thus more suitable for practical engineering applications.The speed and amount of coupling were regarded as disturbances in the analysis of the stability of observer,and the sufficient condi-tions of the system uniformly asymptotically stable was presented.Compared with the u-i model observer, the proposed observer based on Super-twisting algorithm is more accurate and has better robustness to the change of stator resistance.Simulation and experiment results validate the proposed method.%为了提高感应电机定子磁链的观测精确度，提出了一种基于Super-twisting算法的磁链观测方法，设计了定子磁链观测器，并应用到感应电机直接转矩控制中。依据滑模变结构控制的鲁棒性特点来抑制多输入多输出定子磁链观测器系统中的扰动。利用Super-twisting算法所需信息少的优点，设计了简单的控制律，从而更适合于实际工程应用。在对观测器稳定性进行分析时，将转速和耦合量看作扰动来处理，并给出了系统一致渐近稳定的充分条件。与常规电压模型法相比，基于Super-twisting算法的定子磁链估算值更加准确，且对电机定子电阻参数变化具有更强的鲁棒性。仿真和实验结果验证了该方法的有效性。