摘要
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。
According to the specific boundary structure characteristics of the smoothing reactors of high voltage direct current（HVDC） transmission lines, a pilot protection scheme based on the ratio of transient energy within specified frequency at both sides is proposed. The method can distinguish line fault from normal operations by calculating the value of transient energy at both terminals of the HVDC transmission line. When internal faults occur, the measured value at the valve side of smoothing reactor is higher at both terminals than the one at the line side; and the different result can be induced for external faults. On this condition, faulted pole can be identified by the measured value accurately. The proposed scheme can be implemented with high reliability and sensitivity. And it is insensitive to the sampling frequency and data synchronization. Comprehensive simulation experiments have shown that this method can identify the fault quickly and accurately under different fault conditions with high fault resistance.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2015年第22期5757-5767,共11页
Proceedings of the CSEE
基金
国家自然科学基金项目(51377104
51177066
51407115)
中国博士后科学基金资助项目(2014M560333)~~
关键词
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
high voltage direct current（HVDC） transmission line
pilot protection
transient energy
smoothing reactor
line boundary
