發(fā)布時間：2018-09-01 07:44

【摘要】：隨著電網(wǎng)的發(fā)展,輸電線路電壓等級和輸電容量逐步提高,輸電線路故障對社會經(jīng)濟(jì)生活造成的影響越來越大。輸電線路發(fā)生故障后,輸電線路故障定位裝置可為巡線人員提供準(zhǔn)確、可靠的故障點(diǎn)位置信息,縮短故障查找時間,減輕線路巡視人員巡線負(fù)擔(dān),使輸電線路能夠很快恢復(fù)供電,還可以提前發(fā)現(xiàn)輸電線路中的薄弱環(huán)節(jié),有效地減少由于故障停電帶來的經(jīng)濟(jì)損失。因此,輸電線路故障測距是從技術(shù)上保證電網(wǎng)安全、穩(wěn)定和經(jīng)濟(jì)運(yùn)行的重要舉措之一。 本文首先介紹了小波變換的基本概念,分別從連續(xù)小波變換、離散小波變換以及二進(jìn)小波變換三種小波變換情況,闡述討論了小波變換的基本特點(diǎn)和基本性質(zhì)。重點(diǎn)介紹了本文研究工作中所采用的基數(shù)B樣條導(dǎo)數(shù)型小波基的定義、快速分解算法、小波生成和小波分解尺度如何選擇。其次,分析輸電線路故障后,暫態(tài)電壓、電流行波的波過程,母線分支線路數(shù)量、短路過渡電阻等因素對行波測距的影響以及在測距計算中需要采用的解決方法。再次,介紹了單端行波測距算法及其實施步驟,通過EMTDC仿真對算法進(jìn)行了驗證。針對單端行波測距算法具有較高測距精度,但反射波識成功率較低的特點(diǎn),提出了結(jié)合線路長度的反射波識別方法,通過仿真數(shù)據(jù)驗證表明：相對于現(xiàn)有反射波識別法,識別成功率有所提高,改進(jìn)了單端行波測距算法的測距可靠性。最后,介紹了雙端行波測距算法及其實施步驟,通過EMTDC仿真對算法進(jìn)行了驗證。針對影響雙端行波測距精度的過渡電阻、波速、線路參數(shù)等問題,本文研究中提出了基于多尺度分析的故障測距算法以及線路自修正的測距方法,并通過仿真數(shù)據(jù)進(jìn)行了驗證。
[Abstract]:With the development of power grid, the voltage level and capacity of transmission lines are gradually increasing, and the impact of transmission line failures on social and economic life is becoming more and more serious. After the fault of transmission line occurs, the fault location device of transmission line can provide accurate and reliable fault location information for line patrol personnel, shorten the time of fault finding, and lighten the line inspection burden of line patrol personnel. The power supply can be restored quickly and the weak links in the transmission line can be detected in advance, which can effectively reduce the economic loss caused by the failure of power supply. Therefore, transmission line fault location is one of the important measures to ensure the safety, stability and economic operation of power grid. In this paper, the basic concept of wavelet transform is introduced. The basic characteristics and properties of wavelet transform are discussed from three kinds of wavelet transform: continuous wavelet transform, discrete wavelet transform and dyadic wavelet transform. The definition of cardinality B-spline derivative wavelet basis, the fast decomposition algorithm, the wavelet generation and the selection of wavelet decomposition scale are mainly introduced in this paper. Secondly, the influence of transient voltage and current traveling wave process, the number of bus branch lines and short-circuit transition resistance on the traveling wave location and the solutions to the fault location are analyzed. Thirdly, the single-ended traveling wave ranging algorithm and its implementation steps are introduced, and the algorithm is verified by EMTDC simulation. In view of the high accuracy of single terminal traveling wave ranging algorithm, but the low success rate of reflection wave recognition, a reflection wave recognition method combined with line length is proposed. The simulation results show that the method is better than the existing method. The success rate of recognition is improved, and the reliability of single terminal traveling wave ranging algorithm is improved. Finally, the two-terminal traveling wave ranging algorithm and its implementation steps are introduced, and the algorithm is verified by EMTDC simulation. In this paper, a fault location algorithm based on multi-scale analysis and a self-correcting fault location method are proposed to solve the problems such as transition resistance, wave velocity and line parameters that affect the accuracy of two-terminal traveling wave ranging, and are verified by simulation data.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM75

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本文編號：2216557