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利用边界能量的高压直流线路纵联保护方案

DOI: 10.13334/j.0258-8013.pcsee.2015.22.010, PP. 5757-5767

Keywords: 高压直流输电线路,纵联保护,暂态能量,平波电抗器,线路边界

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Abstract:

根据高压直流输电线路两端平波电抗器特有的边界结构特点,提出一种基于平波电抗器两侧特定频段暂态能量比值的纵联保护方案。系统正常运行时,线路两端保护安装处的特定频段暂态能量几乎为零;线路故障后,该能量值明显增大。区内故障时,两端保护安装处的特定频段暂态能量均大于平波电抗器阀侧的值;两端区外故障时,故障端保护安装处特定频段暂态能量小于该端平波电抗器阀侧的值。以此为基础,该文提出根据故障极与健全极线路上特定频段暂态能量的差异实现准确选极的方案。该方案对采样率要求低、反应灵敏、可靠性高且两端不需要数据同步,大量仿真结果表明,新方案可以快速准确的实现区内外故障判别,并具备较好的抗过渡电阻能力。

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