一种高速列车-牵引网阻抗测量方法及其稳定性分析

高速列车运行过程中容易出现低频振荡,影响高速列车牵引传动系统稳定运行。以高速列车单相牵引整流器为研究对象,以分析车-网系统稳定性为研究目标,基于阻抗定义模型,提出了一种牵引传动系统输入导纳及网侧输出阻抗的测量方法。通过对整流器稳定性运行情况的检测,进行阈值判定,进而实时调节扰动谐波幅值的大小。并设计了该测量方法所对应的扰动注入装置,通过对程控电阻的调节实现对扰动谐波幅值的调节。在dq旋转坐标系下对车-网系统阻抗进行测量,基于测量结果进行稳定性分析,通过MATLAB/Simulink进行仿真验证,并进行硬件在环测试验证。仿真及测试结果表明车-网系统时域运行工况与稳定性分析的结果相符合,验证了所设计测量方法的有效性。

Impedance measurement method and stability analysis of high-speed train-traction network

During the operation of high-speed trains, low-frequency oscillations are likely to occur, which affects the stable operation of the high-speed-train traction drive system. Taking the high-speed train single-phase traction rectifier as the research object and the stability analysis of the train-network system as the research goal, based on the impedance definition model, a method for measuring the input admittance of the traction drive system and the output impedance of the network side is proposed. Through detection of the rectifier operation condition, the threshold value is determined, and then the magnitude of the real-time disturbance harmonic is adjusted. The disturbance injection device corresponding to the measurement method is designed to achieve the adjustment of the disturbance harmonic amplitude by adjusting the programmable resistance. The impedance of the train-network system is measured in the dq rotating coordinate system, the stability analysis is performed based on the measurement results, and the simulative verification is performed through MATLAB/Simulink, and the hardware-in-the-loop test verification is performed. The simulative and test results show that the time-domain operating conditions of the train-network system are consistent with the results of the stability analysis, and the effectiveness of the designed measurement method is verified.