基于前行波波形特征的柔性直流输电线路单端行波保护  

Single Terminal Traveling Wave Protection for Flexible HVDC Transmission Lines Based on Forward Wave Shape Information

作　　者：陈淼 贾科 王康达 施志明 陈聪 毕天姝 CHEN Miao;JIA Ke;WANG Kangda;SHI Zhiming;CHEN Cong;BI Tianshu(State Key Laboratory of Alternate Electrical Power System With Renewable Energy Sources(North China Electric Power University),Changping District,Beijing 102206,China;Northwest Branch of State Grid Corporation of China,Xi’an 710048,Shaanxi Province,China)

机构地区：[1]新能源电力系统国家重点实验室(华北电力大学),北京市昌平区102206 [2]国家电网有限公司西北分部,陕西省西安市710048

出　　处：《电网技术》2022年第6期2386-2392,共7页Power System Technology

基　　金：国家自然科学基金项目(51777071)。

摘　　要：柔性直流输电具有更好的新能源消纳能力,对于解决大规模新能源的消纳问题具有重要意义。而现有保护原理在雷击干扰下会发生误动,相应雷击干扰识别判据硬件要求高或理论性不强。针对该问题,提出了一种基于前行波波形特征的单端量保护原理。与区内短路故障相比,区外短路和雷击干扰行波时域特征体现为波头变缓以及波尾下降,利用通式参数分别对上述波形特征进行描述,并据此分析故障前行波的波形特征,最后提取能表征波头陡度和波尾下降的前行波波形特征实现区内故障的有效识别。仿真验证结果表明该保护方法能有快速有效的完成故障识别,且具有较强的耐受过渡电阻能力和抗雷击、噪声干扰能力。The flexible DC transmission,as a better new energy absorption capacity,is of great significance for solving the problems in large-scale new energy consumption.However,the existing protection principles may malfunction under the lightning interference,causing the high hardware requirements or weak theoretical supportings in the corresponding lightning interference identification criteria.In response to this problem,this paper proposes a single-ended protection principle based on the waveform characteristics of the forward wave.Compared with the internal short-circuit faults,the timedomain characteristics of the external short-circuit and the lightning interference traveling wave are reflected in the slowing-down of the wave head and the falling-down of the wave tail.This article uses the general parameters to describe the above-mentioned waveform characteristics and analyzes the characteristics of the forward wave of the faults.Finally,the waveform characteristics of the forward waves that characterizes the steepness of the wave head and the drop of the wave tail are extracted to realize the effective identification of the faults in the area.The simulation verifies that the protection method may quickly and effectively complete the fault identification.It has a strong ability to withstand the transition resistance,and the lightning and noise interference.

关 键 词：柔性直流输电 故障前行波 波形特征 单端行波保护 

分 类 号：TM721[电气工程—电力系统及自动化]