Single-end Line Protection Based on Reflection Coefficient and Model Matching in Flexible DC Power Grid

被引：0
|
作者：
Dai Z. [1 ]
Qin H. [1 ]
Li H. [1 ]
Qiu H. [1 ]
Qiu X. [1 ]
机构：
[1] School of Electric and Electronic Engineering, North China Electric Power University, Baoding
来源：
Dianli Xitong Zidonghua/Automation of Electric Power Systems | 2023年 / 47卷 / 11期
基金：
中国国家自然科学基金;
关键词：
fault initial traveling wave; flexible DC power grid; model matching; single-end line protection; voltage traveling-wave reflection coefficient;
D O I：
10.7500/AEPS20220826008
中图分类号：
学科分类号：
摘要：
A single-end line protection based on reflection coefficient and model matching is proposed to address the issues of internal remote high-resistance fault rejection and lightning interference misoperation of line protection in flexible DC power grid. First, based on the reflection coefficient of voltage traveling waves, a directional criterion is constructed to avoid protection misoperation under backward faults or lightning stroke. Secondly, using the voltage traveling wave transfer function to analyze internal short-circuit faults, as well as the function model satisfied by the first traveling wave of fault voltage at the protection point under forward external faults or forward lightning strikes, a recognition criterion based on model matching is designed according to the different matching degrees between the first traveling wave of fault and the reference function model. Then, a complete single-end line protection scheme is constructed by combining the starting criterion and pole-selection criterion. Finally, the PSCAD simulation results verify that the proposed protection scheme has high reliability and can withstand 500 Ω transition resistance and 20 dB noise. © 2023 Automation of Electric Power Systems Press. All rights reserved.
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收藏
页码：101 / 109
页数：8
相关论文
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