计及网压波动的牵引传动系统间谐波传播机理研究

随着多台电力机车同时投入运行后牵引供电系统出现电压波动现象,其在牵引传动系统中的传播特性是当前的研究热点.首先推导了间谐波在牵引传动系统中的传播机理,并分析了定子间谐波电流频谱与负载转矩间的对应关系;其次研究了间谐波传播下牵引电机电流间谐波辨识方法;随后基于瞬态电流控制策略、磁场定向的矢量控制策略搭建电力机车牵引传动系统的仿真模型,利用扰动激励法模拟了间谐波在牵引传动系统的传播特性;最后结合总体局部均值分解对定子电流的动态频域特性进行分析,确定了整流器输入电压与电机定子电流的间谐波幅频的对应关系.

Inter-harmonic propagation mechanism of traction drive system considering voltage fluctuations

Aiming at the voltage fluctuation in traction power supply system with several locomotives accessed, the research of the propagation characteristics of this phenomenon in traction drive system is focus. Firstly, the propagation mechanism of inter-harmonics in traction drive system is deduced, and the relationship be-tween stator inter-harmonic current spectrum and load torque is analyzed. Secondly, the identification method of the current inter-harmonic of traction motor under inter-harmonics is studied. Thirdly, the simulation model of traction drive system is built based on transient current control strategy and magnetic field oriented vector control strategy, and the propagation characteristics of inter-harmonics in traction drive system are simulated by disturbance excitation method. Finally, the dynamic frequency-domain characteristics of stator current are analyzed based on ELMD(Ensemble Local Mean Decomposition),and the amplitude-frequency correspondence of inter-harmonics between rectifier input voltage and motor stator current is determined.