500kV輸電線路故障定位與故障綜合分析
發(fā)布時間：2019-03-04 19:14
【摘要】：500kV電網(wǎng)構成電力系統(tǒng)的基本骨架,故障發(fā)生后保護正確的動作及快速準確的故障定位,有著重要的經(jīng)濟意義及社會價值。本文基于現(xiàn)場故障錄波數(shù)據(jù),對輸電線路的實用故障定位方法及其故障分析進行深入研究,主要工作如下：針對輸電線路故障定位故障錄波器傳統(tǒng)的故障起始點檢測算法因采樣頻率限制帶來的精度不足問題,提出改進的相電流突變量檢測算法,彌補傳統(tǒng)故障起始點檢測算法的不足�？紤]實際采樣存在不恰好采到恰為故障起始時刻點,單側檢測結果最大誤差為一個采樣點。算法通過現(xiàn)場故障線路數(shù)據(jù)的檢測結果與傳統(tǒng)檢測算法的對比,效果良好,檢測準確,為后續(xù)進行雙端故障定位所需兩端同步電氣量奠定基礎�；阡洸�(lián)網(wǎng)的非同步數(shù)據(jù),提出具有自適應功能的雙端非同步故障測距算法。因輸電線路較長,其線路參數(shù)受到地理環(huán)境、天氣及老化等影響,實用化測距時對其線路參數(shù)進行在線修正,降低測距誤差；因硬件裝置導致的雙端數(shù)據(jù)不同步問題,進行不同步角度的修正,減少測距誤差；對輸電線路兩端PT、CT數(shù)據(jù)進行在線極性檢測調整,防止因極性不一致問題導致測距失��；測距原理結合序分量法,不受線路故障類型的影響,提高其自適應能力。以錄波聯(lián)網(wǎng)非同步數(shù)據(jù)為基礎對輸電線路進行故障綜合分析,包括故障選相、系統(tǒng)等值阻抗、過渡阻抗計算等原理及應用分析；同時,對故障線路進行保護動作行為分析,包括距離保護、縱聯(lián)電流差動保護及方向縱聯(lián)保護,并與故障錄波器所記錄的保護分析結果進行對比分析。故障綜合分析從理論到實踐,又通過實踐檢驗原理的正確性�；贛ATLAB中GUIDE模塊開發(fā)500kV輸電線路故障分析與定位系統(tǒng)平臺,整個軟件平臺系統(tǒng)模塊化、界面化。軟件平臺由菜單欄與七個功能模塊組成。菜單欄主要實現(xiàn)輸電線路參數(shù)及故障線路數(shù)據(jù)的導入、原理的簡介及其它說明,其存儲均采用數(shù)據(jù)庫式存儲方式。七個功能模塊分別為電氣量模塊、波形模塊、故障選相模塊、故障測距模塊、過渡阻抗模塊、保護分析模塊以及系統(tǒng)阻抗模塊。電氣量模塊用以顯示故障線路兩端的相量以及序分量；波形模塊用以顯示故障線路兩端故障錄波器所記錄電氣量波形,并實現(xiàn)對波形的放縮以及選擇性顯示功能；故障選相模塊用以對故障線路進行故障選相；故障測距模塊用以實現(xiàn)對故障線路不同原理的故障定位功能；過渡阻抗模塊用以實現(xiàn)輸電線路故障時對過渡阻抗的計算功能；保護分析模塊實現(xiàn)對故障線路的距離保護、縱聯(lián)電流差動保護以及方向縱聯(lián)保護的分析；系統(tǒng)阻抗模塊用以計算輸電線路兩端的系統(tǒng)等值阻抗。
[Abstract]:500kV power grid constitutes the basic skeleton of power system. It is of great economic significance and social value to protect the correct action and fast and accurate fault location after the fault occurs. Based on-the-spot fault recording data, the practical fault location method and fault analysis of transmission lines are studied in this paper. The main work is as follows: an improved phase current burst detection algorithm for transmission line fault location fault recorder is proposed to solve the problem of insufficient precision caused by the limitation of sampling frequency in the traditional fault starting point detection algorithm for transmission line fault location. It makes up for the deficiency of the traditional fault starting point detection algorithm. The maximum error of one-side detection result is one sampling point, considering that the actual sampling is not exactly the fault start point. By comparing the detection results of field fault line data with the traditional detection algorithm, the algorithm has a good effect and accurate detection, which lays a foundation for the two-terminal fault location to be based on the synchronous electric quantity between the two ends of the two ends. Based on the asynchronous data of recording network, a two-terminal asynchronous fault location algorithm with adaptive function is proposed. Because of the long transmission line, the parameters of transmission line are affected by geographical environment, weather and aging, so the parameters of transmission line are corrected on-line when practical ranging is used to reduce the error of distance measurement. Due to the problem of two-terminal data unsynchronization caused by hardware devices, the error of distance measurement is reduced by correcting the angle of unsynchronization, and the on-line polarity detection and adjustment of PT,CT data at both ends of transmission line is carried out to prevent the failure of ranging due to the problem of inconsistent polarity. The ranging principle combined with the sequential component method is not affected by the fault type of the line and improves its adaptive ability. The fault comprehensive analysis of transmission line is carried out on the basis of non-synchronous data of recording network, including fault phase selection, system equivalent impedance, transition impedance calculation and other principles and application analysis. At the same time, the action behavior of fault line protection is analyzed, including distance protection, longitudinal current differential protection and directional longitudinal protection, and the results are compared with those recorded by fault recorder. Comprehensive fault analysis from theory to practice, but also through practice to verify the correctness of the principle. 500kV transmission line fault analysis and location system platform is developed based on GUIDE module in MATLAB. The whole software platform system is modular and interface. The software platform consists of menu bar and seven functional modules. The menu bar mainly realizes the transmission line parameter and the fault line data import, the principle brief introduction and other explanation, its storage all adopts the database type storage mode. The seven functional modules are electric volume module, waveform module, fault phase selection module, fault distance measurement module, transition impedance module, protection analysis module and system impedance module. The electric volume module is used to display the phasor and sequence component at both ends of the fault line, and the waveform module is used to display the electric volume waveform recorded by the fault recorder at both ends of the fault line, and to realize the scaling and selective display function of the waveform. The fault phase selection module is used to select the fault phase of the fault line, the fault distance module is used to realize the fault location function of different principles of the fault line, the transition impedance module is used to realize the calculation function of the transition impedance when the transmission line fails, and the fault location module is used to realize the fault location function. The protection analysis module realizes the distance protection of the fault line, the analysis of the longitudinal current differential protection and the directional longitudinal protection, and the system impedance module is used to calculate the system equivalent impedance at both ends of the transmission line.
【學位授予單位】：山東大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TM75
本文編號：2434551
[Abstract]:500kV power grid constitutes the basic skeleton of power system. It is of great economic significance and social value to protect the correct action and fast and accurate fault location after the fault occurs. Based on-the-spot fault recording data, the practical fault location method and fault analysis of transmission lines are studied in this paper. The main work is as follows: an improved phase current burst detection algorithm for transmission line fault location fault recorder is proposed to solve the problem of insufficient precision caused by the limitation of sampling frequency in the traditional fault starting point detection algorithm for transmission line fault location. It makes up for the deficiency of the traditional fault starting point detection algorithm. The maximum error of one-side detection result is one sampling point, considering that the actual sampling is not exactly the fault start point. By comparing the detection results of field fault line data with the traditional detection algorithm, the algorithm has a good effect and accurate detection, which lays a foundation for the two-terminal fault location to be based on the synchronous electric quantity between the two ends of the two ends. Based on the asynchronous data of recording network, a two-terminal asynchronous fault location algorithm with adaptive function is proposed. Because of the long transmission line, the parameters of transmission line are affected by geographical environment, weather and aging, so the parameters of transmission line are corrected on-line when practical ranging is used to reduce the error of distance measurement. Due to the problem of two-terminal data unsynchronization caused by hardware devices, the error of distance measurement is reduced by correcting the angle of unsynchronization, and the on-line polarity detection and adjustment of PT,CT data at both ends of transmission line is carried out to prevent the failure of ranging due to the problem of inconsistent polarity. The ranging principle combined with the sequential component method is not affected by the fault type of the line and improves its adaptive ability. The fault comprehensive analysis of transmission line is carried out on the basis of non-synchronous data of recording network, including fault phase selection, system equivalent impedance, transition impedance calculation and other principles and application analysis. At the same time, the action behavior of fault line protection is analyzed, including distance protection, longitudinal current differential protection and directional longitudinal protection, and the results are compared with those recorded by fault recorder. Comprehensive fault analysis from theory to practice, but also through practice to verify the correctness of the principle. 500kV transmission line fault analysis and location system platform is developed based on GUIDE module in MATLAB. The whole software platform system is modular and interface. The software platform consists of menu bar and seven functional modules. The menu bar mainly realizes the transmission line parameter and the fault line data import, the principle brief introduction and other explanation, its storage all adopts the database type storage mode. The seven functional modules are electric volume module, waveform module, fault phase selection module, fault distance measurement module, transition impedance module, protection analysis module and system impedance module. The electric volume module is used to display the phasor and sequence component at both ends of the fault line, and the waveform module is used to display the electric volume waveform recorded by the fault recorder at both ends of the fault line, and to realize the scaling and selective display function of the waveform. The fault phase selection module is used to select the fault phase of the fault line, the fault distance module is used to realize the fault location function of different principles of the fault line, the transition impedance module is used to realize the calculation function of the transition impedance when the transmission line fails, and the fault location module is used to realize the fault location function. The protection analysis module realizes the distance protection of the fault line, the analysis of the longitudinal current differential protection and the directional longitudinal protection, and the system impedance module is used to calculate the system equivalent impedance at both ends of the transmission line.
【學位授予單位】：山東大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TM75
【參考文獻】
相關期刊論文 前2條
1 蔣春芳;王克英;;基于參數(shù)估計的雙端不同步故障測距算法[J];繼電器;2008年01期
2 王波;周昱勇;;基于PMU的多端傳輸線路故障定位新方法[J];電力系統(tǒng)保護與控制;2009年12期
，本文編號：2434551
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