【作者】 黄志武； 阳同光； 桂卫华； 单勇腾； 年晓红；

【Author】 Huang Zhiwu,Yang Tongguang,Gui Weihua,Shan Yongteng,Nian Xiaohong School of Information Science and Engineering,Central South University,Changsha 410075,P.R.China

【机构】 中南大学信息科学与工程学院；

【摘要】 速度辨识是无速度传感器感应电机调速系统中一个重要环节。在基于MRAS(模型参考自适应系统)的速度辨识方法中,由于参考模型采用纯积分型转子磁链电压方程,直流偏置和积分初值累积以及定子电阻变化都导致磁链观测误差较大,进而影响速度辨识精度。本文提出一种改进的MRAS方法,首先引入高通滤波器消除纯积分的影响,并采用模糊控制器在线调整其截止频率改善其动态性能;其次利用模糊控制器在线辨识并调整定子电阻,克服了定子电阻变化影响速度辨识精度的问题。仿真结果表明该方法具有较好的动静态性能以及较高的辨识精度。更多还原

【Abstract】 Speed identification is crucial in speed sensorless induction motor drives.Because the voltage model involves pure integrator,which will cause initial value and drift problems.These problems and resistance varies effect the precision of speed identification.This paper presents an improved method,which uses high-pass filter to avoid these problems and adapt the cut-off frequency on-line to improve dynamic performance by using fuzzy controller;and then eliminate the influence of sta-tor resistance varies by using fuzzy controller to estimate and adapt stator resistance on-line.Simulation results indicate that the method has the characteristic of good dynamic and static performance and high precision speed identification.更多还原