CAJ | 학술논문

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、
근거고압직류수전선로량단평파전항기특유적변계결구특점，제출일충기우평파전항기량측특정빈단잠태능량비치적종련보호방안。계통정상운행시，선로량단보호안장처적특정빈단잠태능량궤호위령；선로고장후，해능량치명현증대。구내고장시，량단보호안장처적특정빈단잠태능량균대우평파전항기벌측적치；량단구외고장시，고장단보호안장처특정빈단잠태능량소우해단평파전항기벌측적치。이차위기출，해문제출근거고장겁여건전겁선로상특정빈단잠태능량적차이실현준학선겁적방안。해방안대채양솔요구저、
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.