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基于暂态波形相关性的配电网故障定位新方法
作者:
作者单位:

1.长沙理工大学电气与信息工程学院,湖南省 长沙市 410114;2.国网九江市濂溪区供电公司,江西省 九江市 332000;3.国网湘潭供电公司,湖南省 湘潭市 411104;4.国网娄底供电公司,湖南省 娄底市 417000

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基金项目:

国家自然科学基金资助项目(51877012);湖南省教育厅重点项目(18A121);湖南省研究生科研创新项目(CX2018B557)。


Fault Location Method for Distribution Network Based on Transient Waveform Correlation
Author:
Affiliation:

1.College of Electrical and Information Engineering, Changsha University of Science & Technology, Changsha 410114, China;2.State Grid Jiujiang Lianxi Power Supply Company, Jiujiang 332000, China;3.State Grid Xiangtan Power Supply Company, Xiangtan 411104, China;4.State Grid Loudi Power Supply Company, Loudi 417000, China

Fund Project:

This work is supported by National Natural Science Foundation of China (No. 51877012), Key Projects of Hunan Provincial Department of Education (No. 18A121) and Hunan Provincial Innovation Foundation for Postgraduate (No. CX2018B557).

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    摘要:

    配电网拓扑结构复杂、分支众多,利用单一故障特征的配电网故障定位方法大多存在可靠性差、定位精度低等不足,为此文中提出了一种基于暂态波形相关性的配电网故障定位新方法。配电线路发生故障后实时检测故障暂态波形,利用S变换构造时频矩阵,将其与各分支样本库中的时频矩阵进行相似度计算,并根据相似度的大小判定故障分支;然后根据同一分支不同位置故障时暂态波形的整体波幅差异来确定故障范围,并利用整体波幅偏差与故障点位置的比例关系计算得到精确的故障点位置。仿真分析表明,在不同的故障条件下,该方法均能可靠、准确地进行故障定位,有望提高配电网故障定位的准确度与可靠性。

    Abstract:

    The distribution network topology is complex and has many branches. The fault location method of distribution network with single fault characteristics mostly has the disadvantages of poor reliability and low positioning accuracy. For this reason,a new method for fault location of distribution network based on transient waveform correlation is proposed.When a fault occurs on the distribution line, the fault transient waveform is detected in real time and a time-frequency matrix is constructed by using S-transform.Then the similarity between the constructed time-frequency matrix and the time-frequency matrix in each branch sample database is calculated and used to determine the fault branch. The fault range is determined according to the difference in the overall amplitude of the transient waveform when the fault is in different locations of the same branch,and the exact location of the fault point is calculated by using the proportional relationship between the overall amplitude deviation and the location of the fault point.The simulation analysis shows that the proposed method can locate faults reliably and accurately under different fault conditions, which is expected to improve the accuracy and reliability of the fault location in the distribution network.

    表 2 线路已知长度存在误差时的定位结果Table 2 Location results when there is an error in the known length of line
    表 4 Table 4
    图1 某10 kV配电网模型Fig.1 A 10 kV distribution network model
    图2 不同分支故障时的暂态波形Fig.2 Transient waveforms when faults occur on different branches
    图3 同一分支故障时的暂态波形Fig.3 Transient waveforms when faults occur on the same branch
    图4 不同位置故障时波形间的波幅偏差累积趋势Fig.4 Cumulative trend of amplitude deviation between fault waveforms in different locations
    表 7 Table 7
    表 6 Table 6
    表 3 Table 3
    表 1 不同时间窗和采样频率下的定位结果Table 1 Location results under different time windows and different sample frequencies
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引用本文

李泽文,刘基典,席燕辉,等.基于暂态波形相关性的配电网故障定位新方法[J/OL].电力系统自动化,http://doi.org/10.7500/AEPS20191122006.
LI Zewen,LIU Jidian,XI Yanhui,et al.Fault Location Method for Distribution Network Based on Transient Waveform Correlation[J/OL].Automation of Electric Power Systems,http://doi.org/10.7500/AEPS20191122006.

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历史
  • 收稿日期:2019-11-22
  • 最后修改日期:2020-06-19
  • 录用日期:2020-05-25
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