配电线路励磁涌流自适应闭锁方案

doi:10.19595/j.cnki.1000-6753.tces.180668

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摘要针对配电线路电流信号中励磁涌流特征被正弦信号掩盖导致其无法被可靠识别、励磁涌流与故障电流并存时保护被错误闭锁等问题,提出了一种配电线路励磁涌流自适应闭锁方案。首先,利用小波变换将线路电流波形在时域内分割为涌流区段与正弦区段,利用最小二乘法求取各区段信号的幅值与相角;然后,取每个周期内幅值最小的区段,判断其幅值与相角是否满足线路保护动作判据,并据此判定线路运行状况,确定是否闭锁线路保护。所提方案不仅能可靠闭锁线路正常运行中的励磁涌流,而且在励磁涌流与故障电流并存时不会出现错误闭锁保护,实现了自适应闭锁。所提方案不需另行设定阈值,且不需获取电压信息,便于工程实现。仿真分析和现场录波数据测试结果验证了所提方案的有效性与可靠性。

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	刘鹏辉
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	雷一腾

关键词 ：配电线路, 励磁涌流, 小波变换, 最小二乘法, 自适应闭锁

Abstract：In distribution lines, the characteristics of magnetizing inrush current may be covered by sine signals so that it cannot be reliably recognized. Besides, line protection may also be incorrectly blocked when inrush current and fault current exist together. Aiming at these problems, this paper proposes an adaptive blocking scheme for inrush current in distribution lines. Firstly, the wavelet transform is utilized to divide line current signal waveform into inrush sections and sine sections, and the least squares method is used to calculate the amplitude and phase angle of each section. And then, the smallest sections in per cycle are evaluated to examine if them meet the action criterion of line protection. Finally, according to the evaluation result, line operating condition is judged so as to determine whether to block line protection. Not only is the proposed scheme able to reliably block inrush current in normal operating condition, but also it will not incorrectly block line protection when inrush current and fault current exist together, which realize the adaptive blocking technique. The proposed scheme does not need to further set other thresholds. In addition, it does not require voltage information. Therefore, it is convenient for the implementation in the actual project. The validity and reliability of the proposed scheme have been verified by simulation tests and field recorded data tests.

Key words： Distribution line magnetizing inrush current wavelet transform least squares method adaptive blocking

收稿日期: 2018-04-23 出版日期: 2019-06-14

PACS:

TM773

基金资助:国家自然科学基金资助项目（51677060）

通讯作者: 黄纯男,1966年生,教授,博士生导师,研究方向为电力系统继电保护、智能电网等。E-mail：yellowpure@hotmail.com

作者简介: 刘鹏辉男,1992年生,博士研究生,研究方向为电力系统继电保护。E-mail：penghuiliu@foxmail.com

引用本文:

刘鹏辉, 黄纯, 石雁祥, 王永红, 雷一腾. 配电线路励磁涌流自适应闭锁方案[J]. 电工技术学报, 2019, 34(11): 2395-2414. Liu Penghui, Huang Chun, Shi Yanxiang, Wang Yonghong, Lei Yiteng. An Adaptive Blocking Scheme for Magnetizing Inrush Current in Distribution Lines. Transactions of China Electrotechnical Society, 2019, 34(11): 2395-2414.

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