Effective Ultra-High-Speed Identification Scheme of Lightning Strikes Suitable for VSC-Based DC Grids  

作　　者：Longlong Chen Xiangyu Pei Xiaoguang Wei Pengzhi Li Guangfu Tang 

机构地区：[1]North China Electric Power University(NCEPU),Beijing 102206,China [2]Changsha University of Science and Technology,Changsha 410114,China [3]State Key Laboratory of Advanced Power Transmission Technology,State Grid Smart Grid Research Institute Co.Ltd.,Beijing 102209,China

出　　处：《CSEE Journal of Power and Energy Systems》2024年第2期548-561,共14页中国电机工程学会电力与能源系统学报（英文）

基　　金：supported by the National Natural Science Foundation of China(No.52277075);the State Key Laboratory of Advanced Power Transmission Technology(Grant No.GEIRI-SKL-2020-012).

摘　　要：To ensure their sound and continuous operation to the greatest extent,VSC-based DC girds have extremely stringent requirements for transmission line relay protection.In terms of guaranteeing their reliability,accurate identification of lightning strikes on DC transmission lines is one of the urgent key problems to be solved.An effective ultra-high-speed identification scheme of lightning strikes suitable for the VSC-based DC grid is proposed in this paper.First,an 1-mode reverse voltage traveling wave(RVTW)is constructed applying the pole-mode transformation theory.Next,fault traveling wave propagation characteristics along the DC transmission line are analyzed in depth utilizing Peterson's law.Then,differences of time-frequency electromagnetic transient characteristics of 1-mode RVTWs between disturbances and faults caused by lightning strikes are distinguished in detail by means of the classical wavelet transformation multi-resolution analysis theory.Finally,extensive simulations are carried out to evaluate the performance of the proposed identification scheme,and by which its excellent rapidity,reliability and robustness are validated.Index Terms-Lightning-strike identification,Multi-resolution analysis,Relay protection,Traveling-wave protection,VsC-based DC grid,Wavelet transformation.

关 键 词：Lightning-strike identification Multi-resolution analysis Relay protection Traveling-wave protection VsC-based DC grid Wavelet transformation 

分 类 号：TM46[电气工程—电器]