本文選題：綜合選線算法　切入點(diǎn)：單相接地　出處：《燕山大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：小電流接地系統(tǒng)指中性點(diǎn)不接地或經(jīng)消弧線圈接地的電力系統(tǒng)，電力系統(tǒng)采用這種中性點(diǎn)非有效接地方式的優(yōu)點(diǎn)是供電可靠性高。在我國的6-66kV電網(wǎng)中，廣泛采用中性點(diǎn)不接地或經(jīng)消弧線圈接地的運(yùn)行方式。單相接地故障在中、低壓配電網(wǎng)中是非常頻繁的，統(tǒng)計(jì)資料顯示單相接地故障占中、低壓配電線路故障的80%以上，且單相接地產(chǎn)生的間歇性弧光接地可能引起電弧接地過電壓進(jìn)而威脅系統(tǒng)的絕緣性能。所以對小電流接地電網(wǎng)單相接地故障的研究具有重要理論意義和現(xiàn)實(shí)意義。 本文研究了典型小電流接地系統(tǒng)單相接地故障的故障特征和電壓、電流變化規(guī)律，對當(dāng)前比較成熟的幾種故障選線算法理論及其各自適用的場合做了分析�；谛‰娏鹘拥叵到y(tǒng)中接地故障復(fù)雜多變，而單一選線算法準(zhǔn)確率低的實(shí)際情況，按照測度值構(gòu)建一套綜合選線判據(jù)，充分發(fā)揮有功功率法、首半波法和小波分析法等各種方法的優(yōu)點(diǎn)，以提高裝置的可靠性。 選擇電流幅值測度、電流相位測度、小波系數(shù)測度、首半波測度和有功分量測度來定量表示具體線路接地故障可能性的大小。針對中性點(diǎn)不接地和中線點(diǎn)經(jīng)消弧線圈接地兩種情況采用不同的測度組合形成一套綜合判定邏輯，保證選線結(jié)果的準(zhǔn)確度，提高該綜合選線方案的適應(yīng)性；增加了PT斷線和鐵磁諧振的判別程序，有效防止將這兩種情況誤判為單相接地故障。 在對小波分析的基本原理進(jìn)行闡述、分析的基礎(chǔ)之上，按照小波分析的延拓、分解和重構(gòu)這三個步驟，編寫了小波分析的C語言代碼并成功應(yīng)用到DSP芯片上。此外，，為了滿足對故障數(shù)據(jù)的記錄和離線分析，本裝置添加了將故障期間原始數(shù)據(jù)保存為COMTRADE標(biāo)準(zhǔn)格式文件的功能。 根據(jù)實(shí)際情況需要，硬件方面本裝置采用DSP+ARM多處理器構(gòu)架，按照功能不同進(jìn)行了模塊化的設(shè)計(jì)，并采用插拔式安裝方式，方便現(xiàn)場調(diào)試、檢修。邏輯嚴(yán)密的軟件流程設(shè)計(jì)、優(yōu)秀的硬件抗干擾能力保證了該選線裝置的整體性能和選線結(jié)果的準(zhǔn)確性。
[Abstract]:The low current grounding system refers to the power system with neutral point ungrounded or grounded by arc-suppression coil. The advantage of this neutral non-effective grounding mode in power system is the high reliability of power supply. It is widely used that neutral point is ungrounded or grounded by arc-suppression coil. Single-phase grounding fault is very frequent in medium and low voltage distribution network. Statistics show that single-phase grounding fault is middle, and low-voltage distribution line fault is more than 80%. The intermittent arc grounding caused by single-phase grounding may cause overvoltage of arc grounding and threaten the insulation performance of the system. Therefore, the study of single-phase grounding fault in low-current grounding power network has important theoretical and practical significance. In this paper, the fault characteristics and the variation of voltage and current of a typical single-phase grounding fault in a small current earthing system are studied. In this paper, several mature fault line selection algorithms and their respective applications are analyzed. Based on the fact that grounding fault is complex and changeable in small current grounding system, and the accuracy of single line selection algorithm is low, In order to improve the reliability of the device, a set of comprehensive line selection criteria is constructed according to the measurement value, and the advantages of active power method, first half wave method and wavelet analysis are fully utilized. Select current amplitude measure, current phase measure, wavelet coefficient measure, The first half wave measure and active power component measure are used to quantitatively express the probability of grounding fault of a specific line. In the case of neutral ungrounded and neutral point grounded by arc-suppression coil, a set of comprehensive decision logic is formed by combining different measures. The accuracy of the line selection results is guaranteed, the adaptability of the comprehensive line selection scheme is improved, and the discrimination program of PT breaking line and ferromagnetic resonance is added to effectively prevent these two cases from being misjudged as single-phase grounding fault. On the basis of expatiating the basic principle of wavelet analysis, according to the three steps of continuation, decomposition and reconstruction of wavelet analysis, the C language code of wavelet analysis is written and successfully applied to DSP chip. In order to record and analyze the fault data off-line, the device adds the function of saving the original data during the fault as COMTRADE standard format file. According to the actual situation, the hardware of the device adopts DSP ARM multiprocessor architecture, modularized design according to different functions, and adopts plugged type installation mode, which is convenient for field debugging, overhaul and logical design of software flow. Excellent hardware anti-jamming ability ensures the overall performance of the line selection device and the accuracy of the line selection results.
【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】：TM862

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 耿云玲;王群;何怡剛;;基于復(fù)數(shù)小波相位信息的電能質(zhì)量擾動的檢測、定位與分類[J];電工技術(shù)學(xué)報(bào);2006年08期

2 張海平;何正友;張鈞;;基于量子神經(jīng)網(wǎng)絡(luò)和證據(jù)融合的小電流接地選線方法[J];電工技術(shù)學(xué)報(bào);2009年12期

3 張俊民;周小猛;魏娟;曹大樹;姚紅宇;;基于小波變換的導(dǎo)線絕緣故障定位方法[J];電工技術(shù)學(xué)報(bào);2012年05期

4 李斌;束洪春;;基于瞬時實(shí)功率和瞬時虛功率的諧振接地系統(tǒng)單相接地選線新方法[J];電工技術(shù)學(xué)報(bào);2012年06期

5 蘇慧玲;王淳;;基于小波分析和擬同步檢波的電壓閃變檢測方法[J];電力科學(xué)與工程;2008年02期

6 陳炯聰,齊鄭,楊奇遜;基于模糊理論的小電流單相接地選線裝置[J];電力系統(tǒng)自動化;2004年08期

7 何正友,錢清泉;電力系統(tǒng)暫態(tài)信號的小波分析方法及其應(yīng)用 (一)小波變換在電力系統(tǒng)暫態(tài)信號分析中的應(yīng)用綜述[J];電力系統(tǒng)及其自動化學(xué)報(bào);2002年04期

8 牟龍華;零序電流有功分量方向接地選線保護(hù)原理[J];電網(wǎng)技術(shù);1999年09期

9 姜霞,J.Nguimbis,程時杰;基于小波變換的低壓電力網(wǎng)載波通信研究[J];電網(wǎng)技術(shù);2002年01期

10 房鑫炎,郁惟鏞,莊偉;模糊神經(jīng)網(wǎng)絡(luò)在小電流接地系統(tǒng)選線中的應(yīng)用[J];電網(wǎng)技術(shù);2002年05期

本文編號：1578505