基于单环定理的HVDC输电线路纵联保护方法  

Single Ring Theorem Based Pilot Protection Method for HVDC Transmission Lines

作　　者：刘晓军[1] 岳爽 杨冬锋 王卫 LIU Xiaojun;YUE Shuang;YANG Dongfeng;WANG Wei(Key Laboratory of Modern Power System Simulation and Control&Renewable Energy Technology(Northeast Electric Power University),Ministry of Education,Jilin 132012,Jilin Province,China;State Grid Beijing Electric Company,Xicheng District,Beijing 100031,China)

机构地区：[1]现代电力系统仿真控制与绿色电能新技术教育部重点实验室(东北电力大学),吉林省吉林市132012 [2]国网北京市电力有限公司,北京市西城区100031

出　　处：《电网技术》2021年第1期162-169,共8页Power System Technology

基　　金：国家重点研发计划项目(2016Y FB0900600);国家电网公司科技项目(52094017000W)。

摘　　要：针对高压直流(high voltage direct current,HVDC)线路高阻接地故障时保护容易拒动的问题,提出一种基于单环定理的纵联保护方法。首先,将直流线路两侧电流突变量作为状态变量构造奇异值等价矩阵,根据单环定理进行谱分析从而实现区内外故障识别;然后,通过广义S变换提取两极电流突变量特定频段暂态能量和的比值特征进行故障选极;最后,给出了纵联保护方案。仿真验证表明,所提保护原理判据简单,易于整定,各种故障情况下均能实现快速、有选择性动作。所提方法对不良数据具有较强的免疫能力,即使在线路末端发生高阻接地等最不利于保护动作的故障情况下仍能可靠动作。For the high impedance faults caused operation failure in the high voltage direct current(HVDC) transmission lines, this paper proposes a pilot protection scheme for HVDC transmission lines based on the single ring theorem. Firstly, the singular value equivalent matrix is formed consisting of the fault components of the current at both ends of the line, with which the internal and external faults can be distinguished. Then, the faulted end of a line can be determined by the ratio difference obtained from the sum of the transient energies in the specific frequency bands of the fault components of the current at both ends of the line through the generalized S transform. Finally, a pilot protection scheme is given. Simulation results in a HVDC system show that the proposed protection acts accurately for fault judgement with high transition resistance, which can effectively work in a variety of operating modes of the bipolar HVDC system and various fault conditions.

关 键 词：高压直流输电线路 电流突变量 单环定理 特定频段 纵联保护 

分 类 号：TM721[电气工程—电力系统及自动化]