电网技术2017，Vol.41Issue(2)：617-623,7.DOI:10.13335/j.1000-3673.pst.2016.0935
基于测量波阻抗的高压直流输电线路纵联保护
Pilot Protection Based on Measured Surge Impedance for HVDC Transmission Lines
摘要
Abstract
In order to solve the problem that present protections for HVDC transmission line hardly satisfy simultaneously requirement in sensitivity and speed, a novel pilot protection method based on measured surge impedance is proposed in this paper. Initial voltage and current traveling waves of single frequency are extracted with S transform and used to calculate measured surge impedance at two line terminals. When an internal fault occurs, measured surge impedances at two terminals are both backside equivalent impedances with small difference in amplitude. For external fault, one measured surge impedance is backside equivalent impedance and the other is line surge impedance, and their amplitude difference is relatively large. Thus, external faults and internal faults can be distinguished by amplitude difference between the measured surge impedances. Large amount of simulation results based on PSCAD/EMTDC indicate that the proposed protection method can be easily set and discriminate internal faults from external under various fault conditions.关键词
直流输电线路/S 变换/测量波阻抗/纵联保护/高阻故障Key words
DC transmission line/S transform/measured surge impedance/pilot protection/high resistance faults分类
信息技术与安全科学引用本文复制引用
李小鹏,滕予非,刘耀,汤涌,甄威..基于测量波阻抗的高压直流输电线路纵联保护[J].电网技术,2017,41(2):617-623,7.基金项目
中国博士后科学基金(2016M592659)。 Project Supported by China Postdoctoral Science Foundation (2016M592659) （2016M592659）
