本文選題：小電流接地 + 故障選線�。� 參考：《山東理工大學(xué)》2014年碩士論文

【摘要】：在我國6~35kV供電系統(tǒng)中大多采用中性點(diǎn)不接地系統(tǒng)或經(jīng)消弧線圈接地系統(tǒng)，通常稱為小電流接地系統(tǒng)。輸電線路發(fā)生單相接地故障的幾率非常高。在小電流接地系統(tǒng)中發(fā)生單相接地故障時，由于系統(tǒng)的三相線電壓仍然對稱，因此，，運(yùn)行規(guī)程規(guī)定允許單相接地繼續(xù)運(yùn)行一到兩個小時。由于單相接地時故障電流較小，而且影響因素較多，使得在小電流接地系統(tǒng)中的單相接地故障檢測正確率往往比較低。因此，研究有效提高單相接地保護(hù)的選擇性是非常必要的。因此，如何實(shí)現(xiàn)快速精確檢測單相接地故障就成為小電流接地系統(tǒng)提高供電可靠性的一個重要課題。 對于小電流系統(tǒng)的單相接地故障選線問題，本文在查閱了國內(nèi)外諸多文獻(xiàn)的基礎(chǔ)上，總結(jié)了現(xiàn)有的多種選線方法，分析了各種選線方法的優(yōu)缺點(diǎn)。提出了中性點(diǎn)不接地系統(tǒng)和中性點(diǎn)經(jīng)消弧線圈接地系統(tǒng)出現(xiàn)的穩(wěn)態(tài)信號和暫態(tài)信號特征，為研究單相故障檢測方法提供了理論基礎(chǔ)，分析得出了利用暫態(tài)信號進(jìn)行故障檢測的新方法。 本文在分析研究了小波變換理論及小波包分解理論基礎(chǔ)上，提出了利用小波分析技術(shù)中的小波包分解對小電流系統(tǒng)進(jìn)行故障選線算法，并給出了選線算法及流程。同時分析了神經(jīng)網(wǎng)絡(luò)理論，提出了基于小波神經(jīng)網(wǎng)絡(luò)的單相故障檢測方法，并給出了故障診斷流程，使單相接地故障選線的正確動作率大大提高。通過理論分析和仿真驗(yàn)證，這兩種小電流接地故障選線方法，能夠提高故障選線的選擇性。利用MATLAB中的SIMULINK仿真平臺搭建了一個四出線的中性點(diǎn)經(jīng)消弧線圈接地的小電流系統(tǒng)模型，對接地故障進(jìn)行了基于小波分析技術(shù)和小波神經(jīng)網(wǎng)絡(luò)技術(shù)的選線仿真，得出了利用小波分析技術(shù)和小波神經(jīng)網(wǎng)絡(luò)技術(shù)進(jìn)行小電流系統(tǒng)接地故障檢測選線具有較高的選擇性。本論文對研究小電流接地故障選線方法具有一定的參考價值。
[Abstract]:The neutral ungrounded system or the arc-suppression coil grounding system are mostly used in the 6~35kV power supply system in our country, which is usually called the small current grounding system. The probability of single-phase grounding fault on transmission line is very high. When the single-phase grounding fault occurs in the low-current grounding system, the three-phase line voltage of the system is still symmetrical, so the operation rules allow the single-phase grounding to continue to run for one to two hours. Because the fault current is small and there are many factors affecting the fault detection in single-phase grounding system, the accuracy rate of single-phase grounding fault detection in low-current grounding system is often low. Therefore, it is necessary to study how to improve the selectivity of single-phase grounding protection. Therefore, how to detect single-phase grounding fault quickly and accurately has become an important issue in improving the reliability of power supply in small current grounding system. For the problem of single-phase grounding fault line selection in small current system, based on the reference of many literatures at home and abroad, this paper summarizes the existing methods of line selection, and analyzes the advantages and disadvantages of various methods of line selection. The characteristics of steady state signal and transient signal of neutral point ungrounded system and neutral point grounding system through arc-suppression coil are presented, which provides a theoretical basis for the study of single-phase fault detection method. A new method of fault detection using transient signals is obtained. Based on the analysis of wavelet transform theory and wavelet packet decomposition theory, this paper proposes a fault line selection algorithm for small current system using wavelet packet decomposition in wavelet analysis technology, and gives the route selection algorithm and flow chart. At the same time, the theory of neural network is analyzed, and the single-phase fault detection method based on wavelet neural network is put forward, and the fault diagnosis flow is given, which greatly improves the correct action rate of single-phase grounding fault line selection. Through theoretical analysis and simulation, it is proved that these two methods can improve the selectivity of fault line selection. Based on the SIMULINK simulation platform in MATLAB, a four-line neutral point grounded by arc-suppression coil is built, and the fault line selection simulation based on wavelet analysis and wavelet neural network is carried out. It is concluded that using wavelet analysis technology and wavelet neural network technology to detect grounding fault line of small current system has high selectivity. This paper has certain reference value to study the method of small current grounding fault line selection.
【學(xué)位授予單位】：山東理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM862;TP18

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 王貴春;孫鳳森;;35kV中性點(diǎn)經(jīng)消弧線圈接地系統(tǒng)設(shè)計(jì)[J];電工技術(shù);2011年04期

2 薛雪;李國欣;張曉青;谷海濤;;基于相位法和有功分量法的小電流接地選線[J];電氣應(yīng)用;2010年15期

3 鄧勇;趙雷;張洪濤;楊敏建;;暫態(tài)零序電流選線法在小電流接地系統(tǒng)中的應(yīng)用[J];電氣應(yīng)用;2012年11期

4 薛永端;徐丙垠;李天友;李京;陳羽;馮祖仁;;利用暫態(tài)信號的配電網(wǎng)小電流接地故障檢測技術(shù)[J];電力設(shè)備;2001年03期

5 李玲玲;李鳳強(qiáng);王成山;;基于模糊綜合決策的配電網(wǎng)單相接地故障選線[J];電力系統(tǒng)及其自動化學(xué)報;2011年05期

6 張偉剛;張保會;;中性點(diǎn)非直接接地系統(tǒng)零序網(wǎng)絡(luò)的相頻特性[J];電力自動化設(shè)備;2010年03期

7 張?jiān)糯?王昕怡;;基于Matlab的小電流接地系統(tǒng)單相故障仿真分析[J];電氣技術(shù);2012年04期

8 張小桃;喬小梅;王愛軍;;小電流接地系統(tǒng)故障選線分析[J];華北水利水電學(xué)院學(xué)報;2010年06期

9 李強(qiáng);;中性點(diǎn)不接地系統(tǒng)電磁式電壓互感器問題綜述[J];華東電力;2011年09期

10 王世旭;王坤;連經(jīng)斌;;小電流接地系統(tǒng)4PT消諧問題的探討[J];華中電力;2010年05期

相關(guān)博士學(xué)位論文 前1條

1 梁睿;基于故障類型的單相接地故障綜合選線研究[D];中國礦業(yè)大學(xué);2010年

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