| 引用本文: | 曾 飞,黄哲忱,卫志农,等.配电线路故障指示器三相同步精度检测方法研究[J].电力系统保护与控制,2021,49(19):11-17. |
| ZENG Fei,HUANG Zhechen,WEI Zhinong,et al.Three-phase synchronization accuracy detection method for a distribution line fault indicator[J].Power System Protection and Control,2021,49(19):11-17 |
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| 摘要: |
| 配电线路故障指示器同步采样性能直接影响所合成的暂态零序电流对故障特征的表达能力，是构建可靠故障判别算法的基本前提，已成为设备质量检测的核心考察指标。提出一种配电线路故障指示器三相同步精度检测方法。首先通过相关系数比较三组原始采样序列之间的时延，滑动搜索确定同步误差的取值区间。再结合牛顿插值拟合方法构造同步误差和相关系数的函数，求解准确的三相同步时间误差，为纠偏调整原始录波数据提供有效可靠依据。仿真试验结果表明该方法检测精度较高，结果可信，能够有效地免疫故障指示器在采样环节引入的误差噪声干扰，具有较好的工程应用价值。 |
| 关键词: 故障指示器 三相同步精度 相关系数法 时间同步误差 |
| DOI：DOI: 10.19783/j.cnki.pspc.201566 |
| 分类号: |
| 基金项目:国家重点研发计划项目资助(2018YFB0904500) |
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| Three-phase synchronization accuracy detection method for a distribution line fault indicator |
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ZENG Fei, HUANG Zhechen, WEI Zhinong, MAO Yuexuan, YIN Zhihua, SUN Guoqiang
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(1. College of Energy and Electrical Engineering, Hohai University, Nanjing 211100, China;
2. State Grid Jiangsu Electric Power Co., Ltd. Research Institute, Nanjing 211103, China)
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| Abstract: |
| The synchronous sampling performance of a distribution line fault indicator directly affects the expression ability of the synthesized transient zero-sequence current to fault characteristics. This is the basic premise of constructing a reliable fault identification algorithm and has become the core index of equipment quality detection. In this paper, a three-phase synchronization accuracy detection method for a distribution line fault indicator is proposed. First, the time delay between three groups of original sampling sequences is compared by correlation coefficient, and the value range of synchronization error is determined by sliding search. Then combined with a Newton interpolation fitting method, the function of synchronization error and correlation coefficient is constructed to solve the accurate three-phase synchronization time error. This provides an effective and reliable basis for rectifying and adjusting the original recording data. The simulation results show that the proposed method has high detection accuracy, reliable results and effective immunity to the error and noise interference introduced by a fault indicator in the sampling link. This has good engineering application value.
This work is supported by the National Key Research and Development Program of China (No. 2018YFB0904500). |
| Key words: fault indicator three-phase synchronization accuracy correlation coefficient method time synchronization error |
