本文關(guān)鍵詞：基于EMD與分形理論的小電流接地系統(tǒng)故障選線方法　出處：《燕山大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 小電流接地系統(tǒng) 故障選線 經(jīng)驗(yàn)?zāi)B(tài)分解 分形理論 關(guān)聯(lián)維數(shù)

【摘要】：電能是人們?nèi)粘Ｉ钪凶顬橹匾哪茉粗唬娏ο到y(tǒng)的穩(wěn)定關(guān)系著國民經(jīng)濟(jì)發(fā)展和國家安全，因此，預(yù)防和排除電力故障極其重要。我國當(dāng)前主要采用小電流接地系統(tǒng)，發(fā)生單相接地故障的幾率較大。由于故障穩(wěn)態(tài)電流小、電流互感器不平衡、負(fù)荷的不規(guī)則變化、電弧不穩(wěn)定等原因，使小電流接地系統(tǒng)的單相接地故障選線一直沒能很好的解決。因此，小電流接地系統(tǒng)單相故障選線的研究已成為當(dāng)前研究的熱點(diǎn)和難點(diǎn)。 本文首先介紹了國內(nèi)外小電流接地系統(tǒng)單相接地故障選線的研究現(xiàn)狀，對選線原理進(jìn)行了歸納總結(jié)；系統(tǒng)的分析了小電流接地系統(tǒng)接地方式與形成故障的原理；然后詳細(xì)的闡述了經(jīng)驗(yàn)?zāi)B(tài)分解的基本理論與分形理論及其應(yīng)用，在此基礎(chǔ)上，重點(diǎn)研究了分形理論中的關(guān)聯(lián)維數(shù)以及算法，與經(jīng)驗(yàn)?zāi)B(tài)分解結(jié)合起來，進(jìn)而提出了將經(jīng)驗(yàn)?zāi)B(tài)分解與關(guān)聯(lián)維數(shù)用于小電流接地系統(tǒng)中的單相接地故障選線的新方法。 最后，本文通過電力系統(tǒng)仿真軟件構(gòu)建一個(gè)10.5kV的輸電線路，將生成的零序電流信號(hào)通過MATLAB進(jìn)行數(shù)據(jù)處理，通過對零序電流進(jìn)行經(jīng)驗(yàn)?zāi)B(tài)分解并提取諧波分量后計(jì)算其關(guān)聯(lián)維數(shù)，通過關(guān)聯(lián)維數(shù)的對比分析，得出了一個(gè)基于經(jīng)驗(yàn)?zāi)B(tài)分解與關(guān)聯(lián)維數(shù)的小電流接地系統(tǒng)的故障選線判據(jù)。 為了測試該選線方法與判據(jù)的可靠性，本文通過大量的仿真算例，并全面考慮了接地方式、接地電阻、故障合閘角和故障相等影響小電流接地系統(tǒng)單相接地故障選線的因素，驗(yàn)證了該故障選線方法與判據(jù)的可靠性。結(jié)果表明，該方法不受上述因素的干擾，能正確選出故障線路，可靠性高，可以作為一種實(shí)際應(yīng)用的新方法。
[Abstract]:The electricity is in people's daily life is one of the most important energy, the stability of the power system affects the development of national economy and national security, therefore, to prevent and eliminate the power failure is extremely important. The current mainly adopts the small current grounding system, single-phase grounding fault rate is larger because of fault current is small, the current transformer is not balanced, irregular change of load, arc instability and other reasons, the small current line selection has no good solution to the single-phase grounding fault of grounding system. Therefore, the small current grounding system single-phase fault line research has become a hot and difficult problem.
This paper first introduces the domestic and foreign small current grounding power system fault of line selection, on line selection principle are summarized; systematic analysis of the principle of small current grounding system and the formation of fault; then elaborates the basic theory of empirical mode decomposition and fractal theory and its application and on this basis, this paper focuses on the fractal theory of the correlation dimension and the algorithm, combined with empirical mode decomposition, and then put forward the EMD and correlation dimension for the new method of grounding line selection of single-phase fault of small current grounding system.
Finally, this paper constructs a 10.5kV transmission line through the power system simulation software, the zero sequence current signal generated by MATLAB data processing, based on the zero sequence current of the correlation dimension calculation of empirical mode decomposition and extraction of harmonic components, by comparing the correlation dimension analysis, obtained a fault in small current and empirical mode decomposition the correlation dimension of the grounding system based on a selection criterion.
In order to test the reliability of the line selection method and criterion, based on a large number of simulation examples, and full consideration of the grounding, grounding resistance, fault and fault closing angle equal effect of small current grounding system fault line selection factors, verify the reliability of line selection criterion method and the fault. The results show that this method is not disturbed by the above factors, can select fault line, high reliability, can be used as a new method for practical application.

【學(xué)位授予單位】：燕山大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM862

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本文編號(hào)：1386050