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超高压直流系统中的直流滤波器保护
引用本文:文继锋,陈松林,李海英,郑玉平,沈国荣,李静.超高压直流系统中的直流滤波器保护[J].电力系统自动化,2004,28(21):69-72.
作者姓名:文继锋  陈松林  李海英  郑玉平  沈国荣  李静
作者单位: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
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。

关 键 词:直流滤波器  比率差动  电容器不平衡保护  谐波电流
收稿时间:1/1/1900 12:00:00 AM
修稿时间:1/1/1900 12:00:00 AM

DC FILTER PROTECTION IN HVDC SYSTEMS
Wen Jifeng,Chen Songlin,Li Haiying,Zheng Yuping,Shen Guorong,Li Jing Nari-Relays Electric Co Ltd,Nanjing ,China Jinan Power Supply Company,Jinan ,China.DC FILTER PROTECTION IN HVDC SYSTEMS[J].Automation of Electric Power Systems,2004,28(21):69-72.
Authors:Wen Jifeng  Chen Songlin  Li Haiying  Zheng Yuping  Shen Guorong  Li Jing Nari-Relays Electric Co Ltd  Nanjing  China Jinan Power Supply Company  Jinan  China
Affiliation:Wen Jifeng,Chen Songlin,Li Haiying,Zheng Yuping,Shen Guorong,Li Jing Nari-Relays Electric Co Ltd,Nanjing 211100,China Jinan Power Supply Company,Jinan 250012,China
Abstract: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.
Keywords:DC filter  differential relay  unbalance protection of capacitance  harmonic current
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