摘要
在直流牵引供电系统中普遍存在钢轨电位过高的问题,而现有钢轨电位计算仅考虑钢轨直流电阻模型,但是轨中电流包含大量1~50 Hz和部分6倍频成份。将钢轨等效为管状导体模型,通过实测典型频率下的钢轨内阻抗,拟合确定P60钢轨等效管状导体参数;建立钢轨-地分布式参数模型,提出在多个牵引变电所、多车的复杂工况下考虑钢轨等效管状导体模型和轨中电流交流频谱的钢轨电位计算方法。通过实验室和工程案例验证了方法的准确性和有效性。计算单边供电下的钢轨纵向电压降落和牵引变电所钢轨电位,钢轨电位中6倍频成份对比轨中电流的6倍频成份增加了58.12%,经过钢轨阻抗频率特性的作用,呈现于钢轨电位成份中6倍频分量影响更大。
In the DC traction power supply system,the problem of excessively high rail potential is common.However,the existing rail potential calculation only considers the rail equivalent resistance model,but the rail current contains a large number of 1~50 Hz and some 6-fold frequency components.In this paper,the rail was equivalent to the tubular conductor model,and the equivalent tubular conductor parameters of P60 rail were determined by measuring the internal impedance of the rail under typical frequency.The rail ground distributed parameter model was established,while the rail potential calculation method considering the rail equivalent tubular conductor model and the AC frequency spectrum of the current in the rail under the complex working conditions of multiple traction and mixing stations and multiple vehicles was proposed.The accuracy and effectiveness of the method were verified by laboratory and engineering cases.By calculating the longitudinal voltage drop of the rail and the rail potential of traction and mixing station under unilateral power supply,the 6-fold frequency component of the rail potential increased by 58.12%compared with the 6-fold component of the current in the rail.Through the effect of rail impedance frequency characteristics,the 6-fold frequency component in the rail potential component has a greater impact.
作者
刘炜
李思文
杨龙
樊国桢
潘卫国
LIU Wei;LI Siwen;YANG Long;FAN Guozhen;PAN Weiguo(School of Electrical Engineering,Southwest Jiaotong University,Chengdu 610031,China;Beijing National Railway Communication Signal Research and Design Institute Group Co.,Ltd.,Beijing 100071,China)
出处
《铁道学报》
EI
CAS
CSCD
北大核心
2022年第1期48-55,共8页
Journal of the China Railway Society
基金
国家重点研发计划(2017YFB1201103-05)。
