本文選題：牽引網(wǎng)阻抗 + 阻抗頻率特性　； 參考：《北京交通大學(xué)》2016年碩士論文

【摘要】：鐵路是一種運(yùn)輸量大、經(jīng)濟(jì)效益高、污染小、方便快捷的交通工具,在現(xiàn)如今人員往來(lái)更加密切、貨物運(yùn)輸頻繁的經(jīng)濟(jì)社會(huì)中越發(fā)重要。近年來(lái),我國(guó)的鐵路獲得了長(zhǎng)足進(jìn)步,但仍舊存在著許多問(wèn)題。其中,各地就時(shí)有發(fā)生因?yàn)殡姎饣F路中牽引供電系統(tǒng)和動(dòng)車組參數(shù)不匹配而發(fā)生諧振過(guò)電壓的情況。因此,開展對(duì)牽引網(wǎng)阻抗頻率特性的研究,對(duì)避免車-網(wǎng)參數(shù)匹配不當(dāng)而引發(fā)諧振過(guò)電壓十分必要,所以本文主要對(duì)牽引網(wǎng)系統(tǒng)阻抗頻率特性做了相關(guān)的研究。為了掌握牽引網(wǎng)阻抗頻率特性,首先對(duì)牽引網(wǎng)各導(dǎo)線參數(shù)進(jìn)行了計(jì)算,獲得牽引網(wǎng)阻抗參數(shù)。利用J.R.Carson提出的以大地為回路的架空導(dǎo)線阻抗計(jì)算方法,分別對(duì)細(xì)化牽引網(wǎng)結(jié)構(gòu)的不同供電方式的牽引網(wǎng)進(jìn)行了阻抗計(jì)算。在Matlab/ Simulink中使用上述牽引網(wǎng)阻抗計(jì)算獲得的參數(shù)進(jìn)行仿真,結(jié)果表明在牽引網(wǎng)阻抗隨頻率變化的過(guò)程中牽引網(wǎng)會(huì)出現(xiàn)諧振的現(xiàn)象,供電臂沿線各處都將產(chǎn)生一個(gè)很大的阻抗,是牽引網(wǎng)各導(dǎo)線分布電容與牽引變壓器漏電感及外部電力系統(tǒng)阻抗相互作用的結(jié)果。由于牽引變壓器及外部電源的阻抗存在非線性,難以通過(guò)仿真進(jìn)行估算,因此需要進(jìn)一步通過(guò)測(cè)量的方法進(jìn)行統(tǒng)計(jì)和計(jì)算。測(cè)量方法有非干預(yù)式測(cè)量法和干預(yù)式測(cè)量法兩大類,非干預(yù)式測(cè)量法分為波動(dòng)量法、線性回歸分析法及復(fù)隨機(jī)變量協(xié)方差法,干預(yù)式測(cè)量法分為投切支路法和諧波電流注入法。通過(guò)對(duì)上述相關(guān)方法建立數(shù)學(xué)模型,并在Matlab中通過(guò)算例驗(yàn)證了相關(guān)方法的可行性及使用條件。最后,還利用了波動(dòng)量法、線性回歸分析法及復(fù)隨機(jī)變量協(xié)方差法分別計(jì)算分析了薊縣南牽引變電所接入的11okV的A相電源系統(tǒng)的部分諧波阻抗。在討論完測(cè)量牽引網(wǎng)阻抗頻率特性的測(cè)量方法,為實(shí)現(xiàn)上述測(cè)量方法的目的,本文通過(guò)應(yīng)用C#程序語(yǔ)言、HS4數(shù)據(jù)采集卡及各類電壓和電流傳感器等硬件設(shè)備開發(fā)了一套用于測(cè)量牽引網(wǎng)阻抗頻率特性測(cè)試的監(jiān)控系統(tǒng)。通過(guò)監(jiān)控系統(tǒng)采集電壓電流數(shù)據(jù),并應(yīng)用上述相關(guān)的測(cè)量方法及數(shù)學(xué)統(tǒng)計(jì)方法實(shí)現(xiàn)對(duì)牽引網(wǎng)阻抗頻率特性的統(tǒng)計(jì)和計(jì)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.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：U223

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本文編號(hào)：2100099