基于MEEMD-HT的无绝缘轨道电路补偿电容故障特征分析

为研究无绝缘轨道电路补偿电容断线故障模式下的故障特征,采用一种改进的集合经验模态分解-Hilbert变换(MEEMD-HT)方法。为分析单一补偿电容断线故障对分路电流的影响,利用传输线理论建立ZPW-2000A轨道电路模型并仿真。采用MEEMD方法对发生补偿电容断线故障下的分路电流幅值曲线进行分解,并且通过HT生成Hilbert谱、时频能量谱、边际谱,对谱线的特征进行分析,实现对补偿电容的故障特征分析。仿真分析结果表明,采用的MEEMD-HT方法得出的Hilbert谱中的故障特征明显,该方法可以用作补偿电容故障特征分析。

Characteristic Analysis of Compensation Capacitor Fault of Jointless Track Circuit Based on MEEMD-HT

To investigate the fault characteristics of compensation capacitor in the disconnection fault mode of jointless track circuit, an modified ensemble empirical mode decomposition and Hilbert transform(MEEMD-HT) method is adopted. Firstly, in order to analyze the influence on short-circuit current in case of single compensation capacitor's disconnection fault, the ZPW-2000 A track circuit model is established and simulated by transmission line theory. Then, the MEEMD method is used to decompose the short-circuit current amplitude curve in case of the compensation capacitor's disconnection fault. Meanwhile, the Hilbert spectrum, time-frequency energy spectrum and marginal spectrum are generated by HT to analyze the characteristics of the spectral line, which fulfills the analysis of compensation capacitor fault characteristics. The simulation results show that the fault characteristics in the Hilbert spectrum obtained by the MEEMD-HT method are obvious and the method can be used to analyze the fault characteristics of the compensation capacitor.