一种新型模型参考自适应滑模速度辨识方法

New Method of Speed Identification Based on Model Reference Adaptive Sliding Mode Control

提出了一种新型的模型参考自适应滑模速度辨识方法,用于异步电动机转速的精确辨识。该方法的结构主要包括参考模型、可调模型和滑模控制器3部分,首先利用参考模型和可调模型分别计算电机的转子磁链,然后将两者误差送入滑模控制器中计算电动机的转速。其中,参考模型采用了一种结构简单的改进电压磁链模型,有效解决了传统电压模型固有的直流偏置误差和初始值积分误差问题,实现磁链的准确观测,从而提高了速度辨识的精度。仿真结果证明该速度辨识方法具有响应速度快、稳态精度高和鲁棒性强的优点。

A new method of speed observation based on MRAS sliding mode control was presented in order to obtain high precision speed observation for asynchronous motors. It consists of three parts： the reference model, the adjustable model and the sliding mode controller. The sliding mode controller uses the estimated ro- tor flux difference of the reference model and the adjustable model to calculate the speed of motor. In the meth- od,the reference model uses a modified voltage model, an effective model to solve the inherent DC offset volt- age error and integral error of the initial value problem to achieve an accurate flux and speed observation. The simulation results verify that the method has a fast response and high accuracy. Besides,it is robust to the variation of motor parameters.