Direction Protection Based on Time-domain Travelling Wave for Flexible MTDC Grid

作     者：Ye Li Bin Li Jiawei He Huijie Lyu Wenbo Wang Zhongrun Xie 

作者机构：State Key Laboratory of Reliability and Intelligence of Electrical EquipmentHebei University of TechnologyTianjin 300132China the Key Laboratory of Smart Grid of Ministry of EducationTianjin UniversityTianjin 300072China he Key Laboratory of Smart Grid of Ministry of EducationTianjin UniversityTianjin 300072China Key Laboratory of Smart Grid of Ministry of EducationTianjin UniversityTianjin 300072China. 

出 版 物：《CSEE Journal of Power and Energy Systems》 (中国电机工程学会电力与能源系统学报（英文）)

年 卷 期：2023年第9卷第4期

页      面：1414-1424页

核心收录：

学科分类：080801[工学-电机与电器] 0808[工学-电气工程] 08[工学] 

基　　金：supported by the National Natural Science Foundation of China(52207088) the National Science Foundation of China for Distinguished Young Scholars(52025071) the Joint Funds of the National Natural Science Foundation of China(U1866205) 

主　　题：Frequency-dependent characteristic operation sensitivity operation reliability traveling-wave based direction protection. 

摘      要：Fault direction identification is important for dc protection,which cannot only be used in directional pilot pro-tection,but also plays an important role in non-unit protection(for excluding backward faults).Direction criteria based on i and di/dt have been utilized in LCC-HVDC system ***,the reliability and sensitivity of the protection are significantly influenced by fault transition resistance and line distribution *** a flexible MTDC grid,boundary char-acteristics of the DC inductor can be utilized to judge the fault *** when the DC inductor is only installed at converter outlet,this kind of direction protection cannot ***,this paper analyzes the frequency characteristic of the fault traveling wave(TW)*** this basis,the direction protection based on the time-domain TW is proposed,which is immune from frequency-dependence line *** with existing direction protection,it has higher operation reliability and sensitivity,and is independent of the line ***,the feasibility and superiority of the designed direction protection are verified by simulation cases based on PSCAD/*** Terms-Frequency-dependent characteristic,operation sensitivity,operation reliability,traveling-wave based direction protection.