超高压直流系统中的直流滤波器保护  

DC FILTER PROTECTION IN HVDC SYSTEMS

作　　者：文继锋[1] 陈松林[1] 李海英[1] 郑玉平[1] 沈国荣[1] 李静[2] 

机构地区：[1]南瑞继保电气有限公司,江苏省南京市211100 [2]济南供电公司,山东省济南市250012

出　　处：《电力系统自动化》2004年第21期69-72,共4页Automation of Electric Power Systems

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.

关 键 词：直流滤波器 比率差动 电容器不平衡保护 谐波电流 

分 类 号：TM77[电气工程—电力系统及自动化] TN713[电子电信—电路与系统]