AT供电方式牵引网故障定位

【作者】 陈豪；

【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】 电气化铁道在国民经济飞速增长中发挥着越来越重要的作用,其AT供电方式已经成为我国未来高速、准高速及重载线路建设的主要方向,AT供电牵引网的故障测距研究也成为相关部门和学者的研究热点,有着重要的实际意义和价值。本文由我国AT供电方式的牵引网的常用设置、线路结构、运行方式、常见故障等方面入手,分别用单端行波法故障测距结合希尔伯特—黄变换(HHT)和S变换能量的智能测距法对AT供电方式牵引网的故障定位进行了研究,并分别给出了两种方法下智能测距模型的构建过程,最后对两种方案进行了相关的对比。本文的主要研究内容如下：(1)简要介绍了牵引供电系统常设配置(牵引变电所、牵引网、分区亭、开闭所、牵引机车等)、牵引网的供电方式,说明了基于Carson公式的牵引网阻抗计算、解耦方法,分析了牵引网供电系统谐波及其含量的计算方法；(2)介绍了行波传输理论、折反射规律、故障行波特点及行波测距方法需要解决的问题,HHT的基本思想、波头的精确定位,S变换及S变换能量法的基本原理；(3)综合考虑AT供电方式下牵引变电所对地电容、AT漏抗、轨道泄露电阻等因素建立了牵引变电所主变的行波模型并用ATP—EMTP建立AT供电方式牵引网系统的仿真模型。通过所搭建模型对AT供电牵引网常见的TR(接触线—轨道)、TF(接触线—正馈线)、FR(正馈线—轨道)和断线(包括T、F电源侧接地,非电源侧悬空和电源侧悬空非电源侧接地)故障进行仿真,利用HHT及S变换能量处理仿真结果验证了模型的有效性,并指出了仿真中发现的不足之处；(4)用HHT的无功能量定义进行选线并分别用HHT及S变换能量的相关结果作为样本建立智能测距模型,对比两种方案的不同,指出不足提出展望。(5)利用牵引变电所的电气量采集装置可以完成单端法的行波故障定位并有比较满意的精度,基于HHT和S变化能量法的智能化测距有着值得期待的应用前景。经验证本文所用到的方法不同程度的体现了自身的可取之处并具有相当的精度,对该领域的故障定位研究有一定的参考价值。更多还原

【Abstract】 Electrified railways is playing more and more important role in the rapid growing national economy, and the AT power supply has become the main direction of high-speed,subhigh-speed and heavy haul construction in future.Study about fault location in AT traction power supply network has become hot off the Press of relevant departments and scholars, which means it has important practical significance and value.This paper first introduced the traction power supply system, include common options,lines structure, common faults.Then used Hilbert-Huang (HHT) transform and S-transform for processing simulation data and the building process of intelligent location model are given respectively. At last get the comparison of two methods.This paper mainly includes the following:(1)Briefed the Permanent configuration in traction power supply system (include substation, traction, District Pavilion, Switching, locomotives, etc.), traction power supply network, illustratd the Carson-based network impedance calculation formula of the traction network and decoupling method, analyzed the harmonic in the traction power supply system and the calculation of its contents;(2)Introduced the traveling wave transmission theory, catadioptric law, characteristics of fault generated traveling waves and problems in fault location;the basic thought of HHT, exact position of the tip,S transform and S transform the energy law also be mentioned;(3)AT Traction power supply system simulation model by using ATP-EMTP was synthetically considered the AT power supply substation ground capacitance, AT leakage reactance, leakage resistance and other factors,and built main transformer of traction substation.Using the model simulated the common faults in AT Power Traction, such as TR (contact wire-track), TF (contact line-are feeder), FR (Positive Feeder-track) and disconnection (including T, F power supply side to ground, non-power unfilled vacancies and superimposition of two cases).Using the simulated results after transformed by HHT and S-transform showed the validity of the model and the shortcomings of simulation.(4)Use reactive power energy based on HHT for choosing the fault line and are given building process of intelligence location model based on the HHT and the S transform energy respectively, and get the comparison of two methods.(5)Using the amount of electrical substation equipment to complete single-ended collection of traveling wave fault location method and accuracy are quite satisfactory, based on HHT and S changes in the energy law had to look forward to intelligent ranging applications.The methods used in this paper reflects their own desirability with varying degrees and had considerable accuracy, which had some reference value in the field of fault location.更多还原