Directional Transient Protection of Multi-terminal Hybrid DC Lines Based on Inherent Mode Energy Entropy

被引：0
|
作者：
Xing C. [1 ]
Li P. [1 ,2 ]
Chen S. [2 ]
Bi G. [2 ]
Deng J. [1 ,2 ]
Zhang Z. [1 ,2 ]
机构：
[1] Electric Power Research Institute of Yunnan Power Grid Co., Ltd., Yunnan Province, Kunming
[2] School of Electric Power Engineering, Kunming University of Science and Technology, Yunnan Province, Kunming
来源：
Dianwang Jishu/Power System Technology | 2023年 / 47卷 / 11期
基金：
中国国家自然科学基金;
关键词：
boundary frequency characteristics; directional transient protection; multi-terminal hybrid DC; natural mode energy entropy; T-zone;
D O I：
10.13335/j.1000-3673.pst.2022.1498
中图分类号：
学科分类号：
摘要：
The boundary between the rectifier side at the head end and the inverter side? at the end of the UHV multi terminal hybrid DC transmission line is asymmetric, and the boundary of the T-zone is not obvious. The accurate identification of the fault zones of the line protection is an important problem to be solved at present. Taking Kun-Liu-Long UHV three terminal hybrid DC transmission system as the research object, this paper proposes a directional transient protection for multi-terminal hybrid DC lines based on the inherent mode energy entropy by installing the protection components on the left and right sides of the T zone. The frequency characteristics of the rectifier side boundary at the head end and the inverter side boundary at the end of the UHV multi-terminal hybrid DC transmission line are analyzed. According to the positive and negative characteristics of the transient energy of the fault current detected by the protection elements on both sides of the T zone, the criterion of fault directions on both sides of the T zone is proposed. The fault transient current is decomposed in different scales using the Complementary Ensemble Empirical Mode Decomposition (CEEMD), and the internal and external fault criteria of the rectifier side at the head end of the line and the inverter side at the end of the line are proposed according to the inherent mode energy entropy, which solves the limitation of extracting a single signal frequency band to detect faults. The analysis and simulation results show that this protection scheme is able to achieve the full line quick action protection for the UHV multi-terminal hybrid DC transmission lines only by using the protection elements on the left and right sides of the T zone, having a good ability to withstand the transition resistance. © 2023 Power System Technology Press. All rights reserved.
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页码：4737 / 4745
页数：8
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