复线电气化铁路直供牵引网精确故障测距研究

Studies on Accurate Fault Location of Direct Power Supply Traction Network of Double Track Electrified Railway

针对含有较长供电线的牵引网现有故障测距方法精度不高问题,通过对复线电气化铁路牵引网等效模型进行计算,在传统牵引网故障测距方法基础上引入供电线与接触网等效阻抗比这一参数,提出了修正后上下行电流比测距法和修正后分段线性电抗测距法,有效解决了复线电气化铁路直供牵引网的精确故障测距问题,修正后的分段线性电抗法为复线牵引网电抗值的精确计算提供了理论支撑;利用RTplus智能电网实时数字仿真仪器建立牵引供电动态模拟试验系统进行仿真测试,测试结果表明所提算法具有良好的可行性和准确性,完全满足工程需求。

With regard to the insufficient accuracy of existing fault location method for traction network with more longer feeder lines,through calculation of equivalent model of the traction network of double track electrified railway and on the basis of the traditional fault location for traction network,a parameter of equivalent impedance ratio of feeder line and OCS is introduced,and the methods of upline and downline current ratio fault location and piecewise linear reactance fault location after modification has been put forward,it is able to solve the problem of insufficient fault location accuracy of the direct power supply network for double track electrified railway.The piecewise linear reactance fault location method provides a theoretical support for accurate calculation of reactance value of traction network of double track electrified railway;RTplus smart grid real-time simulation instrument is used to establish traction power supply dynamic simulation test system for execution of simulation test,analysis of the results show that the proposed algorithm has very good feasibility and accuracy and is able to meet fully the engineering requirements.