牵引网阻抗频率特性测试监控系统

发布时间：2018-07-05 11:44

本文选题：牵引网阻抗 + 阻抗频率特性　；参考：《北京交通大学》2016年硕士论文

【摘要】：铁路是一种运输量大、经济效益高、污染小、方便快捷的交通工具,在现如今人员往来更加密切、货物运输频繁的经济社会中越发重要。近年来,我国的铁路获得了长足进步,但仍旧存在着许多问题。其中,各地就时有发生因为电气化铁路中牵引供电系统和动车组参数不匹配而发生谐振过电压的情况。因此,开展对牵引网阻抗频率特性的研究,对避免车-网参数匹配不当而引发谐振过电压十分必要,所以本文主要对牵引网系统阻抗频率特性做了相关的研究。为了掌握牵引网阻抗频率特性,首先对牵引网各导线参数进行了计算,获得牵引网阻抗参数。利用J.R.Carson提出的以大地为回路的架空导线阻抗计算方法,分别对细化牵引网结构的不同供电方式的牵引网进行了阻抗计算。在Matlab/ Simulink中使用上述牵引网阻抗计算获得的参数进行仿真,结果表明在牵引网阻抗随频率变化的过程中牵引网会出现谐振的现象,供电臂沿线各处都将产生一个很大的阻抗,是牵引网各导线分布电容与牵引变压器漏电感及外部电力系统阻抗相互作用的结果。由于牵引变压器及外部电源的阻抗存在非线性,难以通过仿真进行估算,因此需要进一步通过测量的方法进行统计和计算。测量方法有非干预式测量法和干预式测量法两大类,非干预式测量法分为波动量法、线性回归分析法及复随机变量协方差法,干预式测量法分为投切支路法和谐波电流注入法。通过对上述相关方法建立数学模型,并在Matlab中通过算例验证了相关方法的可行性及使用条件。最后,还利用了波动量法、线性回归分析法及复随机变量协方差法分别计算分析了蓟县南牵引变电所接入的11okV的A相电源系统的部分谐波阻抗。在讨论完测量牵引网阻抗频率特性的测量方法,为实现上述测量方法的目的,本文通过应用C#程序语言、HS4数据采集卡及各类电压和电流传感器等硬件设备开发了一套用于测量牵引网阻抗频率特性测试的监控系统。通过监控系统采集电压电流数据,并应用上述相关的测量方法及数学统计方法实现对牵引网阻抗频率特性的统计和计算。
[Abstract]:Railway is a kind of transportation with large transportation volume, high economic benefit, small pollution, convenient and quick transportation, which is more and more important in the economy and society where people travel more closely and goods are transported frequently nowadays. In recent years, China's railway has made great progress, but there are still many problems. Among them, resonance overvoltage occurs frequently in various places because the parameters of traction power supply system and EMU do not match in electrified railway. Therefore, it is necessary to study the impedance frequency characteristics of traction network to avoid the resonance overvoltage caused by improper matching of vehicle-network parameters, so this paper mainly studies the impedance frequency characteristics of traction network system. In order to master the impedance frequency characteristics of the traction network, the parameters of the traverse of the traction network are first calculated and the impedance parameters of the traction network are obtained. Based on J. R. Carson's method for calculating the impedance of overhead conductors with geodetic circuits, the impedance calculations of traction networks with different power supply modes are carried out respectively. In Matlab / Simulink, the parameters obtained by the impedance calculation of the traction network are used to simulate. The results show that the impedance of the traction network will resonate with the frequency of the traction network, and a large impedance will be produced everywhere along the power supply arm. It is the result of the interaction between the distribution capacitance of each conductor of traction network and the leakage inductance of traction transformer and the impedance of external power system. Because the impedance of traction transformer and external power supply is nonlinear, it is difficult to estimate by simulation. There are two kinds of measurement methods: non-intervention measurement method and intervention measurement method. Non-intervention measurement method is divided into fluctuation method, linear regression analysis method and complex random variable covariance method, and intervention measurement method is divided into switching branch method and harmonic current injection method. The mathematical model of the above methods is established, and the feasibility and application conditions of the relevant methods are verified by an example in Matlab. Finally, the partial harmonic impedance of A phase power supply system of 11okV connected by Jixian Nan traction Substation is calculated and analyzed by means of fluctuation method, linear regression analysis method and complex random variable covariance method, respectively. After discussing the measuring method of impedance frequency characteristic of traction network, in order to realize the above measurement method, In this paper, a monitoring system for measuring impedance frequency characteristics of traction network is developed by using C# programming language HS4 data acquisition card and various kinds of voltage and current sensors. The voltage and current data are collected by the monitoring system, and the statistics and calculation of the impedance frequency characteristics of the traction network are realized by using the above methods of measurement and mathematical statistics.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U223

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