铁路自闭贯通线路故障定位研究

【作者】 何兆林；

【导师】 束洪春；

【作者基本信息】 昆明理工大学 ， 电力系统及其自动化， 2010， 硕士

【摘要】 本文针对自闭/贯通线路和配网中电缆架空线这种混合线路输电模式应用行波法进行故障测距研究。在将行波测距应用在自闭/贯通线路中有三个主要问题需要解决,一是对于行波波头到达时刻的准确判定；二是对行波波速的合理选择；最后是如何解决混合线路中波速不一致的问题。首先介绍了行波基本理论以及行波测距的基本原理,分别分析了架空线和电缆线路中行波的传播特性并选择双端法对混合线路进行行波测距；介绍了相模变换的基本理论以及架空线路和电缆线路的模量传播参数,做为之后分析计算的理论基础；介绍了小波变换原理以及HHT变换原理,并分析比较了用三次B样条小波和HHT变换识别故障行波波头以确定波头到达时刻。而后在PSCAD中分别对单一电缆线路和单一架空线路搭建仿真模型,利用仿真软件中的线路参数矩阵分析计算行波在两种线路中的传播速度特点,并分别给出了两种线路中的波速拟合曲线。最后应用行波双端法对混合线路进行故障测距,通过使用等效波速法解决混合线路中波速不一致的问题,对几种典型混合线路进行仿真分析,验证了该算法对于混合线路测距的优越性,并对该算法进行了改进,提高了测距的准确性通过理论分析和大量仿真计算表明,对于故障行波波头的到达时刻使用三次B样条小波进行小波变换后可以更为准确的确定故障行波波头到达时刻；利用线路参数矩阵进行分析计算,选择其故障频段下的波速对混合线路故障行波测距的仿真表明,该波速可以满足测距所需精度,能够实现对混合线路故障的准确定位；利用等效波速测距方法对混合线路进行故障测距,很好的解决的混合线路波速不一致的问题,但在仿真中也发现了该种方法的不足,即对于发生在电缆中的线路若使用架空线路中的波速等效,误差会较大,甚至导致测距的失败,使用改进后的算法后,测距结果更加准确。更多还原

【Abstract】 In this paper, since the railway automatic blocking and continuous transmission lines of cable lines and overhead lines in distribution network transmission mode of application of this hybrid line traveling wave method of fault location. Traveling wave in the application of the mixed lines there are three major problems to be solved, one for traveling wave determine the exact time of first arrival; the second is the logical choice for traveling wave velocity; finally, how to solve the mixed line problem of inconsistency in velocity.First introduced the line of wavelet theory and the basic principle of traveling wave, respectively, of the overhead lines and cable lines BOC Wave Propagation and select the double-end method for traveling wave mixing line; describes the basic phase mode transformation theory and the overhead lines and cable lines modulus communication parameters, as calculated after the analysis of the theoretical basis; introduced the wavelet transform principle and the principle of HHT, and compare the cubic B-spline wavelet and HHT transform fault traveling wave identification first to determine the arrival time of the first wave.Then in the PSCAD a single cable line, respectively, and a single overhead line structures simulation model, using simulation software in the calculation of the line parameter matrices of the two lines in the wave propagation velocity respectively, and given the velocity of two lines fitting curve.Finally the wave double-end method for fault location on the mixing line, by using the equivalent circuit velocity method to solve the mixed problem of inconsistent velocity of several typical hybrid circuit simulation and analysis, show that the algorithm for hybrid circuits ranging superiority, and the algorithm is improved to improve the accuracy of the distance.Through theoretical analysis and a large number of simulation show that the fault line for the first wave arrival times using wavelet cubic B-spline wavelet transform can be more accurately determine the fault line of the first wave arrival time; use of matrix analysis of line parameters calculated Select the fault band velocity on the mixing line under the traveling wave fault simulation shows that the velocity accuracy required to meet the distance, to achieve the accuracy of the hybrid line fault location; velocity ranging method using equivalent circuit for the hybrid fault location, a good mix of lines to solve the problem of inconsistent velocity, but also found in the simulation methods of the deficiencies that occurred in the cable for the line if the use of overhead lines in the velocity equivalent, the error would be more large, and even lead to the failure of distance, using the improved algorithm, the distance was more accurate.更多还原