引用本文: | 赖平,周想凌,邱丹.小电流接地系统暂态电流频率特性分析及故障选线方法研究[J].电力系统保护与控制,2015,43(4):51-57.[点击复制] |
LAI Ping,ZHOU Xiangling,QIU Dan.Research on transient-current frequency analysis and faulty line detecting method in indirectly grounding power system[J].Power System Protection and Control,2015,43(4):51-57[点击复制] |
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摘要: |
小电流接地系统选线过程中常常用到暂态高频电流分量,但在高频分量提取过程中其频率范围的设定通常只能依靠经验方法进行。针对这一现状,解析分析了小电流接地系统暂态电流的频率特性,提出了暂态电流频率变化范围的估算方法,有针对性地给出故障线路与非故障线路差异性较大的特征分量,为高频分量频率范围的选定提供了理论基础。在此基础上,利用现有的滤波工具提取选定频带范围的高频分量,并结合相对熵理论计算相对熵系数矩阵,进而辨识出故障线路。仿真结果表明,所提出的选线方法具有广泛的适用性和正确性。 |
关键词: 特征分量 暂态电流分量 频率特性 相对熵系数 故障选线方法 |
DOI:10.7667/j.issn.1674-3415.2015.04.008 |
投稿时间:2014-05-16修订日期:2014-06-16 |
基金项目:国家自然科学基金项目(51207113) |
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Research on transient-current frequency analysis and faulty line detecting method in indirectly grounding power system |
LAI Ping,ZHOU Xiangling,QIU Dan |
(State Grid Hubei Electric Power Company, Wuhan 430077, China) |
Abstract: |
High-frequency transient current component is used to select fault line in indirectly grounding power system, but the frequency range is usually chosen by experience method. In the view of this situation, this paper analytically analyses the frequency characteristics, proposes a method to estimate the frequency range, provides the feature components between fault line and non-fault line and lays the theoretical foundations for high-frequency component selecting. On the basis of frequency analysis, this paper extracts high-frequency components in the selected frequency range by using the existing filtering tool, calculates the relative entropy coefficient matrix combined with the relative entropy theory and then identifies the fault line. Simulation results show that the proposed route selection method has wide applicability and accuracy. |
Key words: characteristic component transient frequency component frequency characteristics relative entropy coefficient fault line selection method |