基于MRAS的无速度传感器感应电机DTC系统研究  

Speed Sensor- less Direct Torque Control System of Induction Motor based on MRAS

作　　者：林辉[1] 

机构地区：[1]西安铁路职业技术学院,陕西西安710014

出　　处：《西安铁路职业技术学院学报》2011年第4期13-17,共5页Journal of Xi’an Railway Vocational & Technical Institute

摘　　要：对基于模型参考自适应（MRAS）方法的无速度传感器感应电机直接转矩控制（DTC）系统进行了研究。由于电压参考模型采用纯积分型转子磁链电压方程，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。通过引入输出滤波环节改进了纯积分器存在的不足，并利用popov超稳定性理论设计了一种并行的转速与定子电阻辨识方法，有效地提高了速度辨识的精度。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。Study of speed sensorless Direct Torque Control（DTC） system of induction motor based on model reference adaptive system（MRAS） method is proposed in this paper. Because the voltage model involved pure integrator, which caused initial value and drift problems. These problems and resistance varies effected the precision of speed identification. The output filter is introduced to improve the performance of the pure integrator, by using popov~ hyperstability theory, the influence caused by the stator resistance variation is eliminated by feedback the estimated stator resistance value to the system. Consequentlly, the speed estimate precision is improved effectively. Simulation results indicate that the method has the characteristic of good dynamic and static performance and high precision speed identification.

关 键 词：模型参考自适应 直接转矩控制 无速度传感器 感应电机 

分 类 号：TM346[电气工程—电机]