基于改进磁链观测器的直线异步电动机直接牵引力控制  

Direct Thrust Control of Linear Induction Motor Based on Improved Flux Observer

作　　者：史黎明[1] 王珂[1,2] 李耀华[1] 

机构地区：[1]中国科学院电工研究所,北京100190 [2]中国科学院研究生院,北京100049

出　　处：《电工技术学报》2008年第9期45-50,共6页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(50577062)

摘　　要：在考虑动静态边缘效应及运行工况对直线异步电动机参数的影响的情况下,建立了直线异步电动机动态数学模型。利用直接转矩控制参数鲁棒性好的优点,提出了与之相应的基于电压型磁链观测器的直线异步电动机直接牵引力控制策略。针对传统的电压型磁链观测器存在的幅值和相位误差,引入了相应的与低通滤波器和高通滤波器串联的补偿环节。仿真和实验结果表明,电机电磁推力的观测值与实际值基本一致,系统具有良好的动静态性能。本文所提出的方案在直线异步电动机牵引控制中具有良好的应用前景。In this paper, the dynamic mathematic model of linear induction motor （LIM） is developed considering the influences to LIM＇s parameters due to its end effect and the operation condition. Since the high robust to parameters, direct thrust control （DTC） scheme for LIM is applied by using the voltage model. The problem of phase and magnitude error existing in the flux observer of traditional voltage model for DTC is solved by introducing reasonable compensation to low-pass-filter （LPF） and high-pass-filter （HPF） in series. Simulation and experiment results show that the estimated thrust and actual output thrust are in agreement satisfactorily. Moreover, the system has great dynamic and steady state performance. The proposed method has good application prospect in LIM driven systems.

关 键 词：直线异步电动机 直接牵引力控制 磁链观测器 

分 类 号：TM359[电气工程—电机]