感应电机无速度传感器矢量控制系统的定子电阻在线辨识

该文针对利用磁通观测器推算转子磁通的感应电机无速度传感器矢量控制系统，提出了定子电阻在线辨识法。在利用q轴磁通推算转速的基础上，该系统利用d轴磁通误差实现定子电阻在线辨识，该方案的优点是系统简单，解决了低速运行时电压模型的定子电阻变化对系统稳定性和速度控制精度的影响问题。数字仿真和实验结果验证了定子电阻在线辨识的必要性和该方案的有效性。

ON-LINE IDENTIFICATION OF STATOR RESISTANCE FOR SENSORLESS VECTOR CONTROL SYSTEM OF INDUCTION MOTORS

This paper presents an on-line identification algorithm of stator resistance for a speed sensorless vector control system of general-purpose induction motors. The proposed system is based on the observer theory and the adaptive control theories. Since the q-axis estimated rotor flux is used for speed estimation, it must converge to zero by proportional plus integral (PI) regulator. The d-axis flux error between the adjustable model and the reference model is considered to be caused by the stator resistance variation mainly. The relationship between this error and the stator resistance variation is analyzed at a steady state. A very simple on-line identification algorithm using the d-axis flux error for stator resistance is proposed. The advantages of the proposed algorithm are simplicity and solution of the problems of system stability and speed control accuracy under the influence of stator resistance variation when using only a voltage model, especially in low-speed operation. The necessity of the stator resistance identification and the effectiveness of the proposed algorithm have been verified by digital simulation and experimentation.