基于IHHT的多测点行波法故障测距在全并联AT牵引网中的研究

Study on Fault Location of Multi Measuring Points Traveling Wave Method Based on IHHT in All Parallel AT Traction Network

针对当前全并联自耦变压器(AT)牵引网线路参数不均匀,牵引供电系统因故障导致结构的改变使得故障测距精度不足的问题,将行波法运用到牵引网故障测距中,并考虑到牵引网电气参数的改变及行波色散效应导致行波波速不稳定的问题,提出了一种基于多测点的故障测距方法。该方法首先通过在横联线间串入高频阻波器完成对电压行波波头的有效辨识,然后利用改进的希尔伯特-黄变换对行波波头进行捕捉,最后利用多测点测距方程得到故障测距结果。Matlab/Simulink的仿真结果表明,所提测距算法基本与波速无关,不受牵引网结构、参数变化的影响,比传统牵引网故障测距算法具有更高的精度。

Aiming at the current problem that the all parallel AT traction network line parameters are not uniform and the traction power supply system is structurally changed due to faults,which makes the insufficient accuracy of fault location.The traveling wave method is applied to the fault location of the traction network in this study,considering the change of the electrical parameters of the traction network and the traveling wave dispersion effect would cause the traveling wave velocity unstable,this paper proposes a fault location method based on multi measuring points.This method can effectively identify the voltage traveling wave head by serially inserting a high frequency trap between the transverse lines,and then utilize the improved Hilbert-Huang transform to capture the traveling wave head,finally on the basis of the multi measuring points equation obtained fault location results.According to the simulation results of Matlab/Simulink,the proposed multi measuring points algorithm is almost independent of the wave velocity and is not affected by changes in the structure and parameters of the traction network,it has higher accuracy than the traditional traction network fault location algorithm.