本文選題：配電網(wǎng)　切入點(diǎn)：單相接地故障　出處：《華北電力大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：我國的配電網(wǎng)大都采用小電流接地方式,系統(tǒng)單相接地故障定位問題長期沒有得到很好的解決。現(xiàn)有的各種定位方法大致可以分為利用穩(wěn)態(tài)分量和利用暫態(tài)分量定位兩類。傳統(tǒng)的基于故障穩(wěn)態(tài)信號(hào)定位方法在實(shí)際應(yīng)用中可能會(huì)出現(xiàn)精度降低、受中性點(diǎn)接地方式影響等問題；另外由于受到量測值小或者不確定的影響,此種方法難以滿足實(shí)際需要。 隨著科學(xué)技術(shù)的高速發(fā)展,對(duì)小電流接地系統(tǒng)的故障暫態(tài)信號(hào)的測量已經(jīng)易于實(shí)現(xiàn)。暫態(tài)信號(hào)通常要比穩(wěn)態(tài)信號(hào)大很多,故障區(qū)段與非故障區(qū)段有著明顯差異,因此利用暫態(tài)分量進(jìn)行定位具有靈敏度高、受消弧設(shè)備影響較小等優(yōu)點(diǎn)。本文第一章分析了各種傳統(tǒng)故障定位方法的優(yōu)缺點(diǎn),在此基礎(chǔ)上,第二章中根據(jù)小電流接地系統(tǒng)發(fā)生單相接地故障后系統(tǒng)的暫態(tài)特征,提出了基于模糊理論的多信息融合定位方法,融合多種暫態(tài)故障信息構(gòu)成的綜合判據(jù)可有效克服采取單一判據(jù)的故障定位方法存在的適應(yīng)性差、定位結(jié)果可靠性低的問題。 第三章提出了基于暫態(tài)分量遺傳算法的定位方法,利用線路上各終端測得的暫態(tài)零序電流和電壓的突變方向異同形成判據(jù),利用遺傳算法進(jìn)行定位,充分利用了遺傳算法的容錯(cuò)性,全局尋優(yōu)特性�；贛atlab的仿真測試證明了定位方法的有效性,也為該方法的實(shí)用化打下了基礎(chǔ)。 根據(jù)本文第二章提出的基于模糊理論的多信息融合定位方法,已設(shè)計(jì)出相應(yīng)的單相接地定位系統(tǒng)。經(jīng)過RTDS仿真測試,其可靠性及實(shí)用性已經(jīng)得到了充分驗(yàn)證。
[Abstract]:Most distribution networks in China use small current grounding. The problem of single-phase grounding fault location in system has not been solved well for a long time. The existing localization methods can be divided into two categories: steady state component and transient component. Traditional steady state signal location based on fault. The accuracy of the method may be reduced in practical application. Due to the influence of the neutral grounding mode, the method is difficult to meet the practical needs because of the small or uncertain measurement value. With the rapid development of science and technology, it is easy to measure the fault transient signal of small current grounding system. The transient signal is usually much larger than the steady state signal, and there are obvious differences between the fault section and the non-fault section. Therefore, the transient component has the advantages of high sensitivity and less influence by arc suppression equipment. In the first chapter of this paper, the advantages and disadvantages of various traditional fault location methods are analyzed. In the second chapter, according to the transient characteristics of single-phase grounding fault in low-current grounding system, a multi-information fusion localization method based on fuzzy theory is proposed. The comprehensive criterion based on multiple transient fault information can effectively overcome the problems of poor adaptability and low reliability of the fault location results based on the single criterion. In the third chapter, a localization method based on transient component genetic algorithm is proposed. Using the abrupt direction of transient zero sequence current and voltage measured by the terminal on the line to form a criterion, the genetic algorithm is used to locate the location. The fault tolerance and global optimization of genetic algorithm are fully utilized. The simulation results based on Matlab prove the effectiveness of the method and lay a foundation for the practical application of the method. According to the multi-information fusion localization method based on fuzzy theory proposed in the second chapter of this paper, the corresponding single-phase grounding location system has been designed. The reliability and practicability of the system have been fully verified by RTDS simulation test.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM862

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本文編號(hào)：1566399