不对称高压脉冲轨道电路的计算机仿真模型研究

Research of Simulation Model for Asymmetric High-voltage Pulse Track Circuit

不对称高压脉冲轨道电路是为解决分路不良而兴起的一种新型轨道电路,其信号形式为周期性的高压脉冲,为建立准确的脉冲信号仿真模型,提出一种基于矢量匹配法的宽频建模方法。首先分别利用扫频法和有限元分析法获得变压器和钢轨两个关键设备的频变参数,然后利用矢量匹配拟合和电路综合理论得到对应的电路模型,并分别验证设备模型的正确性,最后搭建系统仿真模型并与现场实测数据进行对比,表明基于矢量匹配法所建立的宽频模型可以用于脉冲轨道电路的仿真计算和应用分析,文末利用此仿真模型分析道床电阻、补偿电容等现场环境的变化对轨道电路传输特性的影响。

The asymmetric high-voltage pulse track circuit is a new type of track circuit developed to solve the poor shunting problem.Its signal is a kind of periodic high-voltage pulse.In order to establish an accurate simulation model for the pulse signal,a wideband modeling method was proposed based on the vector fitting method.Firstly,the frequency-varying parameters of the transformer and the rail were obtained by frequency sweeping method and finite element method respectively.Then the corresponding circuit model was obtained based on the vector fitting and circuit synthesis theory,and the effectiveness of the two models was verified respectively.At last,the system simulation model was established and compared with the field measured data.It indicated that the broadband model based on the vector fitting method can be used to simulate and analyze the pulse track circuit.At the end of this paper,the influence of the change of the environment,such as ballast resistance and compensation capacitors on the transmission characteristics of track circuit was analyzed based on the simulation model.