基于磁通观察器的感应电动机无速度传感器矢量控制系统的参数在线辨识

On-line Parameter Identification for Sensorless Vector Control System of Induction Motors Based on Flux Observer

提出了一个基于磁通观察器的感应电动机无速度传感器矢量控制系统的参数在线辨识方案 ,包括利用d轴磁通误差实现定子电阻在线辨识法和利用励磁电流指令上叠加交流信号实现转子电阻在线辨识法。该方案的优点是系统简单 ,解决了电机参数变化对调速精度和系统稳定性影响的问题。数字仿真和实验结果验证了方案的有效性。

This paper presents an on-line parameter identification scheme for a sensorless vector control system of general-purpose three-phase induction motors based on flux observer.The proposed scheme based on the model reference adaptive system(MRAS)theory includes a stator resistance identifier using the d -axis flux error and a rotor resistance identifier using perturbation on the flux command implemented by the reference magnetizing current with sinusoidal signal injection.Since the mathematical model of the system is constructed in the synchronous rotating reference frame using only the fluxes observer,the advantages of the scheme are simplicity and solving the problems of speed control accuracy and system stability under the influence of motor parameter variation.The effectiveness of the scheme has been verified by digital simulation and experiment.