柔性直流系统的线路保护关键技术与展望  

Review and Prospect on Transmission Line Protection in Flexible DC System

作　　者：刘海金 李斌[1] 温伟杰[1] 何佳伟[1] 李晔[1] 李博通[1] 韩伟 LIU Haijin;LI Bin;WEN Weijie;HE Jiawei;LI Ye;LI Botong;HAN Wei(Key Laboratory of Smart Grid(Tianjin University),Ministry of Education,Nankai District,Tianjin 300072,China;Electric Power Research Institute of State Grid Henan Electric Power Company,Zhengzhou 450052,Henan Province,China)

机构地区：[1]智能电网教育部重点实验室(天津大学),天津市南开区300072 [2]国网河南省电力公司电力科学研究院,河南省郑州市450052

出　　处：《电网技术》2021年第9期3463-3477,共15页Power System Technology

摘　　要：直流技术是促进我国资源优化配置、解决我国能源和环境问题的关键,柔性直流技术的发展可进一步促进新能源消纳、提高供电可靠性,同时解决常规直流输电和交流电网的技术瓶颈。继电保护是电力系统安全稳定运行的第一道防线,也是目前柔性直流系统发展和推广的技术难题之一。在介绍直流技术发展历程的基础上,对柔性直流系统线路故障特征及保护需求进行了分析和总结;然后,从保护原理出发,对现阶段柔性直流系统的线路保护关键技术的研究现状进行了梳理和归纳;最后,在总结直流线路保护技术发展不足和需求的同时,对其进一步发展进行了预期和展望。DC technology is the key to promote the optimal allocation of power resources and solve the energy and environment problems in China. The development of VSC-based DC technology will further promote the consumption of renewable power generation, improve the reliability of power supply, and solve the technical bottlenecks of traditional HVDC transmission system and AC power system. The protection technology, the first line of defense for the security and stability of power system, is one of the technical challenges for the development and promotion of flexible DC systems. Based on the introduction of the development and application of DC technology, this paper summarizes the fault characteristics of the transmission lines in the flexible DC systems and analyzes their protection requirements. Then, on the basis of protection principles, the research results of transmission line protection of the flexible DC systems are reviewed. Finally, the deficiencies and demands of the DC transmission line protection are illustrated, and its further development is prospected.

关 键 词：柔性直流系统 输电线路 继电保护 单端量保护 纵联保护 

分 类 号：TM721[电气工程—电力系统及自动化]