基于线性插值的动车组牵引电机速度估计方法

Speed Estimation for Induction Motor of Electric Multiple Unit Based on Linear Interpolation

如何有效实时检测牵引电机的速度信息是实现动车组高性能牵引控制的基础。本文介绍用于动车组速度的齿轮速度传感器的测速原理,在此基础上,提出一种基于线性插值的电动车组用异步牵引电机转速估计的方法。该方法在低速区和转速调节的动态过程中效果显著,有效克服速度传感器低分辨率带来的测量延时问题,并且转速估计的准确性不受牵引电机参数变化的影响。通过对转速的估计,间接矢量控制中转子磁场定向的准确度也明显提高。本文以国产先锋号电动车组的牵引电机控制为例,利用本文方法进行仿真和实验研究,仿真和实验结果验证了该方法的准确性。

Measuring real-time traction motor speeds efficiently is the basis of achieving high performance traction control of Electric Multiple Units（EMUs）.In this paper,the speed estimation methods for the induction motor and the measuring principle of the gear speed sensor are introduced.Then,a new speed estimation method based on T-method measuring is proposed for the induction motor used in EMUs.It works very well,especially in the low-speed range and dynamic process of speed regulation,which removes measuring delay brought by the low resolution ratio and achieves speed estimation with an accuracy independent of parameter variations of the traction motor.The accuracy of rotor flux orientation is also improved greatly through speed estimation.Finally,taking the traction motor of EMU Xianfeng as an example,simulation and tests are made and the results demonstrate the rationality of the new method.