全球能源互联网（英文）2024，Vol.7Issue(2)：206-216,11.DOI:10.1016/j.gloei.2024.04.008
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
Research on the longitudinal protection of a through-type cophase traction direct power supply system based on the empirical wavelet transform
摘要
Abstract
This paper proposes a longitudinal protection scheme utilizing empirical wavelet transform(EWT)for a through-type cophase traction direct power supply system,where both sides of a traction network line exhibit a distinctive boundary structure.This approach capitalizes on the boundary's capacity to attenuate the high-frequency component of fault signals,resulting in a variation in the high-frequency transient energy ratio when faults occur inside or outside the line.During internal line faults,the high-frequency transient energy at the checkpoints located at both ends surpasses that of its neighboring lines.Conversely,for faults external to the line,the energy is lower compared to adjacent lines.EWT is employed to decompose the collected fault current signals,allowing access to the high-frequency transient energy.The longitudinal protection for the traction network line is established based on disparities between both ends of the traction network line and the high-frequency transient energy on either side of the boundary.Moreover,simulation verification through experimental results demonstrates the effectiveness of the proposed protection scheme across various initial fault angles,distances to faults,and fault transition resistances.关键词
贯通式/同相牵引直接供电系统/牵引网/经验小波/纵联保护Key words
Through-type/Cophase traction direct power supply system/Traction network/Empirical wavelet transform(EWT)/Longitudinal protection引用本文复制引用
李璐,张泽端,蔡旺,庄启康,毕贵红,邓健,陈仕龙,阚小瑞..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[J].全球能源互联网（英文）,2024,7(2):206-216,11.基金项目
This work was supported by the National Natural Science Foundation of China(51767012),Curriculum Ideological and Political Connotation Construction Project of Kunming University of Science and Technology(2021KS009),and Kunming University of Science and Technology Online Open Course(MOOC)Construction Project(202107). （51767012）
