特高压直流线路保护原理及动作策略分析

Analysis of UHVDC Line Protection Principle and Operation Strategy

首先结合特高压直流输电的特点,分析了复杂的电网结构、灵活的运行方式和更远的输电距离对直流线路保护提出的更高要求。其次,结合直流线路保护的工程应用现状,阐述了基于单端量和双端量的保护原理的研究进展,归纳了2类保护中涉及的方法。随后总结了常见的特高压直流线路保护动作策略,并对故障重启动逻辑进行了介绍。最后,在现有研究的基础上,分析了直流线路保护需进一步关注的问题和可能的解决办法。

Firstly,according to the characteristics of ultra-high voltage direct current(UHVDC)transmission,the higher requirements for the protection of HVDC transmission lines are analyzed in terms of complex grid structure,flexible operation mode and longer transmission distance.Secondly,based on engineering application status,the research progress of UHVDC line protection principles based on single-terminal and double-terminal quantities is elaborated,and the involved methods are summarized.Subsequently,UHVDC line protection operation strategies are summarized,and the line recovery logic is introduced specifically.Finally,issues on DC line protection to be further addressed,as well as possible solutions,are rendered on the basis of legacy researches.