基于HHT的10kv配电网单相接地故障定位的研究

1、山东农业大学毕 业 论 文基于HHT的10kv配电网单相接地故障定位的研究 院 部 机械与电子工程学院 专业班级 电气班 届 次 学生姓名 学 号 指导教师 年月日 / 文档可自由编辑打印目 录摘要IAbstractII引言11相关问题的研究进程以及需要解决的问题11.1 配电网单相接地故障定位的研究背景和意义11.2 国内外关于配电网单相接地故障选线方法简介11.3 尚需解决的问题21.4 未来的发展趋势21.5本文所做的主要工作32 小电流接地系统介绍42.1 小电流接地系统单相接地故障时的稳态分量42.1.1 中性点不接地系统42.1.2 中性点经消弧线圈接地系统52.2 小电流系统单相接地故障时的暂态分量82.2.1 电感性电流特性分析82.2.2 电容性电流特性分析92.2.3 接地电流特性分析92.3 本章小结103 基于HHT的故障区间定位和测距113.1 HHT-希尔伯特-黄变换113.1.1 经验模态分解（EMD）113.1.2 希尔伯特变换123.2 基于HHT的故障行波到达时刻的检测133.3 故障区间定位和测距方法的提出143.3.1 三端配电线路故障区间定位1

2、53.3.2 配电线路故障距离的确定163.4 故障区间定位和测距的仿真分析161）仿真算例一162）仿真算例二173.5 本章小结20结论21参考文献22致谢23ContentsAbstractIIIntroduction11 The research process of related problem and the problem needed to solve11.1 The background and meaning of the research 11.2 Brief introduction about single-phase grounding fault 11.3 The problem still need to solve21.4 The development trend of the future21.5The main work done in this paper32 Basic knowledge of the small current grounding system42.1 The steady state component 42.1.1T

3、he neutral point geounding system42.1.2 Neutral point via arc suppression coil grounded system52.2 The transient component 82.2.1 The analysis of inductive current characteristic82.2.2 The analysis of capacitive current characteristic92.2.3 The analysis of grounding current characteristic92.3 The summary of this chapter103 The fault location and disance interval based on HHT113.1 HHT-Hilbert-Huang Transform113.1.1 Empirical mode decomposition（EMD）113.1.2 The Hilbert transform123.2 The fault dete

4、ction of wave arriving time basde on HHT133.3 Proposed fault location and distance interval methods143.3.1 Three-terminal distribution line fault interval mapping153.3.2 The determination of distribution line fault distance163.4 Simulation of fault section locating and ranging161）The simulation example of a162）The simulation example of b173.5 The summary of this chapter20Conclusion21Reference22Acknowledgement23基于HHT的10kv配电网单相接地故障定位的研究（山东农业大学 机械与电子工程学院）摘要：近年来，我国经济发展迅猛，高速发展的经济对供电质量和供配电可靠性提出了更加严格的要

5、求，当配电网络发生故障时，运行人员应及时、准确地找出故障点并及时对故障进行排除，尽快恢复供电，以减小用户损失。我国配电网中，66kV及以下大都属于小电流接地系统，其故障的70%以上是单相接地故障。所以，对配电网单相接地故障定位进行深入研究，迅速、及时、准确找出故障点，这有利于提高配电网供电可靠性和电能质量。本文首先对课题的背景意义进行介绍，对国内外配电网单相接地故障选线以及故障定位的研究动态及其发展趋势进行了总结，并对小电流接地系统出现单相接地故障后零序电流稳态分量和暂态分量特征进行了详细分析。另外，鉴于希尔伯特-黄变换即HHT分析方法处理复杂信号时的独特优势，本文提出用HHT分析方法对测点处线模电压波形突变点进行检测，进而得出故障行波到达测点的时刻，利用传统的双端行波测距法计算双端支路的故障距离，形成故障支路判定矩阵，通过故障支路判定矩阵来判断出故障区间，进而实现故障测距。最后通过Matlab仿真，论证了本文所提方法的准确性。关键词：小电流接地系统；单相接地故障；希尔伯特-黄变换；故障定位The study based on the HHT of 10 kv power distri

6、bution network single-phase grounding fault location Lihua Fang(Mechanical & Electrical Engineering College of Shandong Agricultural University, Taian, Shandong 271018) Abstract With Chinas economic development, the distribution network is constantly evolving, and users put forward higher requirements for the reliability and quality of supplying power, once the distribution network has faulty,the operating personnel should find failure location,remove failure and restore power to users as soon a

7、s possible. In our country ,66kV and below distribution network mostly belongs to the small current grounding system,and the single-phase ground fault accounts for 70% of the small current grounding system fault. Therefore, researching deeply on single-phase ground fault locating of distribution network and identifying the point of failure rapidly and accurately has a very important significance to improve the reliability and quality of supplying power . This paper describes the background and s

8、ignificance of the subject, summarizes the domestic and international research dynamic and development trend which is about the single-phase to ground fault line selection and fault location of the distribution network and analyzes the zero sequence current steady-state component and temporary-state component features after the single-phase ground fault occurs in the small current grounding system. Secondly, this paper presented the transient zero-sequence current amplitude comparison method to

9、select the faulty line on the basis of these studies, which is a good solution to line selection problem when the single-phase ground fault occurs in the small current grounding system. Again, given the Hilbert - Huang Transform (HHT) analysis method has unique advantages to analyze the complex signal, this paper uses the Hilbert - Huang Transform analysis method to detect mutation point of line mode voltage waveforms of measuring point, and then acquires the moment that the fault traveling wave reaches the measuring point, uses the traditional

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