感应电机滑模磁链观测器的直接转矩控制研究

Novel Flux Sliding-mode Observer for Direct Torque Controlled Induction Motor Driving Systems

交流感应电机磁链观测是决定电机传动系统性能的关键,针对传统电机磁链观测精度易受电机参数变化等因素的影响,提出了一种基于新型滑模变结构定子磁链观测方法,与传统滑模磁链观测器不同,该观测器仅在定子坐标系下通过滑模函数驱使观测电流跟随实际电流,实现对定子磁链的观测。同时,该方法间接实现了对转子速度及磁链的估计,使磁链观测过程不依赖于实际转子速度分量,对转子位置具有完全鲁棒性。理论分析和实验结果证明了该方法能在全速范围内实现精确观测定子磁链估计,具有控制精度高、鲁棒性强、动态响应快等特点。

The flux estimation of the induction machine determines the performance of the drive system.The parameters of induction motors are prone to easy impaction with the aid of the conventional flux estimation.A new stator flux estimation is presented,which realizes accurately in the stationary frame of axes by the sliding-mode function.At the same time,the observer of the model contains a rotor-speed-independent term behavior,and estimates the rotor flux and the exact speed of the rotor indirectly.Theoretical analysis and MATALIB simulation results confirm the robustness,accuracy,quick response of the drive.