轨道电路对分相区暂态牵引电流干扰的抑制方法  

Suppression Solutions to Transient Traction Current Interference in Neutral Zone for Track Circuit

作　　者：杨世武[1] 陈炳均 陈海康 崔勇[1] 唐乾坤 YANG Shiwu;CHEN Bingjun;CHEN Haikang;CUI Yong;TANG Qiankun(School of Electronic and Information Engineering,Beijing Jiaotong University,Beijing 100044,China;Standards and Metrology Research Institute,China Academy of Railway Sciences,Beijing 100081,China;China Railway Eryuan Engineering Group Limited Company,Chengdu 610031,China)

机构地区：[1]北京交通大学电子信息工程学院,北京100044 [2]中国铁道科学研究院标准计量研究所,北京100081 [3]中铁二院工程集团有限责任公司,四川成都610031

出　　处：《西南交通大学学报》2019年第6期1332-1341,共10页Journal of Southwest Jiaotong University

基　　金：中国铁路总公司技术标准编制项目(17CR062)

摘　　要：电力机车及动车组经过含分相区的轨道区段时,暂态牵引电流中包含的谐波电流可能对轨道电路形成干扰并引发故障.为保障轨道电路在谐波影响下可靠工作,对暂态电流干扰抑制方法进行了研究.首先,按照欧标中加窗FFT (fast Fourier transformation)方法设计了谐波数据处理流程,给出现场测试数据分析结果,说明对轨道电路形成干扰的原因;然后,以信号载频1 700 Hz和谐波1 750 Hz为实例,从直接抑制谐波干扰的角度简要讨论了基于FPGA (field-programmable gate array)的FIR (finite impulse response)数字滤波器方案和仿真结果,并指出由于信号频带与谐波干扰非常接近,必然以较高阶数和处理延时作为代价;最后,基于谐波干扰的电流源特征和工程可行性,提出并重点阐述了轨道电路发送器和衰耗器的协同优化方案,通过合理配置发送器电平和衰耗器级数,在满足轨道电路调整、分路和机车信号状态的约束条件下,提高对谐波干扰的抑制效果,可将信号干扰比提高6 dB.When an electric locomotive or an EMU(electric multiple unit) passes neutral zone in a track section,transient traction current is very likely to cause harmonic interference to track circuit,which may produce failure.To guarantee stable performance of track circuit under the influence of harmonic interference,the suppression methods of transient traction current are studied. Based on the European standards, the windowed FFT(fast Fourier transformation) method is adopted to design the procedure of harmonic data processing,and the analysis results of field test data are utilized to illustrate the interference mechanism for track circuit. Then,taking an example with a1 700 Hz signal carrier and 1 750 Hz harmonic frequency,the solution and simulation results of FPGA(fieldprogrammable gate array)-based FIR(finite impulse response) digital filter are briefly discussed from the point of direct suppression to harmonic interference. Due to the tiny difference between signal frequency and interference harmonic,the solution has to run at the cost of long response time and high order. Lastly,based on the current source feature of harmonic interference and project feasibility, the collaborative optimization scheme for the transmitter and attenuator of track circuit is proposed. Namely,by optimizing the transmitting level and attenuator step,the suppression to harmonic inference can be improved with an increase of 6 dB in signal-to-interference ratio while the operation states of track circuit are ensured including its clearance,occupancy and cab signaling.

关 键 词：轨道电路 暂态 牵引电流 谐波干扰 协同优化 信号干扰比 

分 类 号：U284.2[交通运输工程—交通信息工程及控制]