基于限流电抗器电压积分凹凸性的柔性直流输电线路单端量保护方案  

Single-ended Protection Scheme of Flexible DC Transmission Lines Based on Concavity and Convexity of the Current-limiting Reactor Voltage Integration

作　　者：贾科 陈淼 施志明 陈聪 赵冠琨 毕天姝 JIA Ke;CHEN Miao;SHI Zhiming;CHEN Cong;ZHAO Guankun;BI Tianshu(State Key Laboratory of Alternate Electrical Power System With Renewable Energy Sources(North China Electric Power University),Changping District,Beijing 102206,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

出　　处：《电网技术》2021年第11期4498-4504,共7页Power System Technology

基　　金：国家重点研发计划项目(2018YFB0904104)。

摘　　要：现有柔性直流输电线路保护无法同时耐受高阻和噪声干扰,会出现区内高阻故障拒动以及区外金属性故障误动。针对这些问题,提出了一种基于限流电抗器电压积分凹凸性的柔性直流输电单端量保护方案。该方法利用了与过渡电阻无关的波形特征提取差异,具有较强的耐受过渡电阻能力;采用积分法构成判据,具有较强的抗噪声干扰能力,可靠性高。基于PSCAD/EMTDC的仿真结果表明,所提方案能快速、可靠地完成故障判别,同时具有较强的耐受过渡电阻能力以及抗干扰能力。The existing flexible dc transmission line protection cannot withstand high resistance and noise interference at the same time, causing the refusal of high-resistance faults in the area and the misoperation of metallic faults out of the area. In response to these problems,this paper proposes a single-ended protection scheme of flexible dc transmission based on the concavity and convexity of the current-limiting reactor voltage integration. The method takes advantage of the difference in the waveform feature extraction that is independent of the transition resistance, and has a strong withstanding of the transition resistance. Forming the criterion with the integral method, it has a strong anti-noise ability and high reliability. The simulation results based on the PSCAD/EMTDC show that the proposed scheme can perform fault discrimination quickly and reliably and has strong withstanding of the transition resistance and anti-interference.

关 键 词：柔性直流输电 行波 凹凸性 单端电气量保护 

分 类 号：TM721[电气工程—电力系统及自动化]