摘要
介绍了超高压直流输电系统中的直流滤波器保护,分析了直流滤波器的特点以及超高压直流输电的各种运行工况对直流滤波器保护带来的影响,提出了直流滤波器保护的总体设计思想、相应的保护原理与方案,重点讨论了差动保护和不平衡保护的实现及其应该注意的问题。
The protection of DC filter is important in the inversion situation in HVDC systems. The characteristics of a DC filter
and the influence of different working situations to the DC filter protection are analyzed, such as the floating harmonic current,
transient caused by control system and external fault, etc. The integrated scheme and essential principle of the protection of the
DC filter are proposed. Emphases are put on the differential protection and the unbalance protection. In order to enhance the
sensitivity of the differential protection, the through current is selected as restraint current. In addition the floating restraint
current and changed ratio action characteristic are introduced to improve the reliability of differential protection. The transient
unbalance protection and the adaptive compensated summation current of capacitance are also used to enhance the sensitivity and
reliability of unbalance protection. Finally all the principles are verified by laboratory tests and real operation of power systems.
出处
《电力系统自动化》
EI
CSCD
北大核心
2004年第21期69-72,共4页
Automation of Electric Power Systems
关键词
直流滤波器
比率差动
电容器不平衡保护
谐波电流
DC filter
differential relay
unbalance protection of capacitance
harmonic current
