异步电机反馈线性化二阶滑模定子磁链观测器设计

Design of feedback linearization second-order sliding mode stator flux observer for induction motors

中文关键词  异步电机  反馈线性化  二阶滑模  磁链观测  直接转矩控制

英文关键词  induction motor  feedback linearization  second-order sliding mode  flux estimation  direct torque control

中文摘要

      为了提高异步电机定子磁链的观测精度, 提出了基于反馈线性化的二阶滑模磁链观测方法, 设计了定子磁 链观测器, 并应用到异步电机直接转矩控制中. 为更准确的观测磁链, 选取转子磁链为系统输出, 运用微分几何理 论将异步电机系统的输入/输出线性化, 得到以转子磁链为输出的异步电机反馈线性化模型. 在此基础上设计基 于Super-twisting算法的二阶滑模转子磁链观测器, 实现对转子磁链的准确估算, 并对所设计的观测器进行稳定性分 析. 然后再利用转子磁链与定子磁链的关系, 估算出定子磁链. 将该观测器用于异步电机直接转矩控制中, 达到了 很好的控制效果. 仿真与实验结果验证了该方法的可行性和有效性.

英文摘要

      In order to improve the observation accuracy of stator flux of induction motors, a second-order sliding mode flux estimation method based on feedback linearization is proposed. A stator flux observer is designed and applied for direct torque control (DTC) of induction motors. The rotor flux is selected as the system’s output to estimate the flux more accurately, the induction motor system is input-output linearized by using the differential geometry theory, and the feedback linearization model with rotor flux as output is obtained. On this basis, a rotor flux second-order sliding mode observer is designed based on Super-twisting algorithm to estimate rotor flux, and this paper analysis the stability of the designed observer. By using the relationship between the stator flux and the rotor flux to estimate the stator flux. The observer is applied to DTC of induction motors and achieves a good control performance. Simulation and experiment results verify the feasibility and effectiveness of the proposed method.