摘要
根据贯通式同相牵引直接供电系统牵引网线路两端特有的边界结构特点，提出一种基于经验小波变换的牵引网线路纵联保护方案。由于边界对故障信号高频分量的衰减作用，导致区内外故障时，边界两侧高频暂态能量比值不同。区内故障时，区内线路两端检测点高频暂态能量均大于相邻线路检测点高频能量；区外故障时，区内线路检测点高频能量将小于相邻线路检测点高频能量。故采用经验小波变换对所采集的故障电流信号进行分解处理，得到故障信号高频暂态能量，利用牵引网线路两端，边界两侧高频暂态能量的差异构造牵引网线路纵联保护方案，在不同故障初始角，不同故障距离，不同过渡电阻故障场景下对所提保护方案进行仿真验证，实验结果表明，所提保护方案均能准确动作。
Research on the longitudinal protection of a through-type cophase traction direct power supply system based on the empirical wavelet transform
基于经验小波变换(EWT)的贯通式同相牵引直接供电系统纵向保护研究
Lu Li ,Zeduan Zhang,Wang Cai,Qikang Zhuang,Guihong Bi,Jian Deng,Shilong Chen,Xiaorui Kan
1.Faculty of Electric Power Engineering,Kunming University of Science and Technology,Kunming 650500,P.R.China
2.Brunel University London,London UB8 3PH,United Kingdom
3.Yunnan Power Grid Co.,Ltd.,Kunming 650041,P.R.China
收听作者1分钟语音介绍
Abstract
Keywords
Through-type; Cophase traction direct power supply system; Traction network; Empirical wavelet transform (EWT);Longitudinal protection
Fig. 1 Structural drawing of the through-type cophase traction direct power supply system
Fig. 2 Schematic of direct traction power supply network boundary
Fig. 3 Amplitude–frequency characteristics of the direct power supply on the traction network boundary
Fig. 4 Additional network diagram of traction network after faults occur inside
Fig. 5 Additional network diagram of the traction network after reverse faults occur outside
Fig. 6 Results of Fourier spectrum segmentation
Fig. 7 Transient high-frequency energy spectrum at checkpoints M and a as the midpoint was dysfunctional inside the line
Fig. 8 Transient high-frequency energy spectrum at checkpoints N and b as the midpoint was dysfunctional inside the line
Fig. 9 Transient high-frequency energy spectrum at checkpoints N and b as the midpoint was dysfunctional outside the line
Fig. 10 Logic diagram of the protection scheme
Fig. 11 Simulation model of the through-type cophase traction direct power supply system
本文引文信息
Li L, Zhang Z D, Cai W, et al. (2023) Research on the longitudinal protection of a through-type cophase traction direct power supply system based on the empirical wavelet transform, Global Energy Interconnection, 7(2): 206-216
李璐，张泽端，蔡旺等 (2023) 基于经验小波变换(EWT)的贯通式同相牵引直接供电系统纵向保护研究. 全球能源互联网（英文）, 7(2): 206-216
Biographies
Lu Li
Lu Li (1976-), Female, Ph.D., associate professor, master’s supervisor; research interests are power market, traction power supply system, and energy economics.
Zeduan Zhang
Zeduan Zhang (1997-), Male, Master; research interests are power market, power economy and management, and renewable energy grid connection research.
Wang Cai
Wang Cai (1995-), Male, Master; research interests are relay protection in power systems.
Qikang Zhuang
Qikang Zhuang (1996-), Male, Master; research interests are boundary protection of traction network in through-type cophase power supply systems.
Guihong Bi
Guihong Bi (1968-), Male, Ph.D, Professor, Master’s supervisor; research interests are modeling, optimization, and intelligent data analysis of new energy systems.
Jian Deng
Jian Deng (1997-), Male, Master; research interests include new types of relay protection and its automation.
Shilong Chen
Shilong Chen ( 1 9 7 2 - ) , M a l e , P h . D , Corresponding Author, Professor, Master’s supervisor; research interests include power system relay protection, and traction power supply systems.
Xiaorui Kan
Xiaorui Kan (1994-), Male, Master; research interests include power market, power economy and management, and renewable energy grid connections.
编辑：王彦博
审核：王 伟
郑重声明
根据国家版权局相关规定，纸媒、网站、微博、微信公众号转载、摘编本微信作品，需包含本微信名称、二维码等关键信息，并在文首注明《全球能源互联网》原创。
个人请按本微信原文转发、分享。
分享优秀论文，帮小编点个 “在看” 哦
