基于小波暂态能量比值的牵引网单端方向保护  

Single-ended Directional Protection of Traction Network Based on Wavelet Transient Energy Ratio

作　　者：陈仕龙[1] 李朋松 庄启康 毕贵红[1] 高敬业 赵四洪 CHEN Shilong;LI Pengsong;ZHUANG Qikang;BI Guihong;GAO Jingye;ZHAO Sihong(Faculty of Electric Power Engineering,Kunming University of Science and Technology,Kunming 650500,China)

机构地区：[1]昆明理工大学电力工程学院,云南昆明650500

出　　处：《电力科学与工程》2022年第8期22-29,共8页Electric Power Science and Engineering

基　　金：国家自然科学基金(51767012)。

摘　　要：考虑贯通式同相牵引直接供电系统牵引网边界对故障电流信号高频部分具有衰减作用的特性,结合多尺度小波变换,提出了一种基于小波暂态能量比值的牵引网单端方向保护方案。首先,利用故障后暂态功率的能量极性构造故障方向判据;然后,对故障电流信号进行多尺度小波变换,分别求取高频带暂态能量与低频带暂态能量;最后,根据高、低频暂态能量比值大小构造正方向区内、外故障判别判据。仿真实验结果表明,所提保护方案能实现牵引网全线快速保护。Considering the attenuation characteristics of the traction network boundary to the high-frequency part of the fault current signal of the through in-phase traction direct power supply system,combined with the multi-scale wavelet transform,a single-ended directional protection scheme of the traction network based on the wavelet transient energy ratio is proposed.Firstly,the fault direction criterion is constructed by using the energy polarity of post fault transient power.Secondly,the multi-scale wavelet transform is applied to the fault current signal to calculate the high-frequency band transient energy and low-frequency band transient energy respectively.Finally,according to the ratio of high-frequency and low-frequency transient energy,the discrimination criteria of internal and external faults in the positive direction region are constructed.The simulation results show that the proposed protection scheme can realize the fast protection of the whole traction network.

关 键 词：牵引网 小波暂态能量 功率方向 单端保护 

分 类 号：U223.82[交通运输工程—道路与铁道工程]