基于自抗扰控制技术的感应电动机MRAS转速估计研究

Study on MRAS speed estimator of induction motor based on active disturbance rejection control technique

提出一种新型的以定子电流为变量的基于模型参考自适应的感应电动机转速估计模型.以感应电动机本身为参考模型,以可直接测量的定子电流为状态变量,以定子电流-电压方程为可调模型,根据Popov超稳定理论提出满足全局渐进稳定的转速自适应律估计转速.提出不依赖于转速的基于扩张状态观测器观测转子磁链模型,分离磁链观测与转速估计两个系统.该转子磁链观测器不依赖于转子电阻,在实际应用鲁棒性较好.最后利用Matlab进行仿真,仿真结果说明模型的有效性.

This paper proposes a novel model of stator-current-based MRAS speed estimator for induction motor.The estimator uses induction motor as reference system and stator current as state-variable of the reference system which can be measured directly.The stator voltage-current equation is used as adjustable model.A speed adaption law is proposed based on Popov＇s criterion and used to calculate the speed.The rotor flux is observed through an expended-state-observer without the information of rotor speed.The proposed rotor flux observer is also independent with the rotor resistance,and has robust performance in practical application.Simulation is carried out using Matlab,and the result illustrates the effectiveness of speed estimator.