A Pilot Directional Protection for HVDC Transmission Line Based on Relative Entropy of Wavelet Energy

被引:20
作者
Lin, Sheng [1 ]
Gao, Shan [1 ]
He, Zhengyou [1 ]
Deng, Yujia [1 ]
机构
[1] Southwest Jiaotong Univ, Sch Elect Engn, Chengdu 610031, Peoples R China
基金
中国国家自然科学基金;
关键词
FAULT-DETECTION; CLASSIFICATION;
D O I
10.3390/e17085257
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
On the basis of analyzing high-voltage direct current (HVDC) transmission system and its fault superimposed circuit, the direction of the fault components of the voltage and the current measured at one end of transmission line is certified to be different for internal faults and external faults. As an estimate of the differences between two signals, relative entropy is an effective parameter for recognizing transient signals in HVDC transmission lines. In this paper, the relative entropy of wavelet energy is applied to distinguish internal fault from external fault. For internal faults, the directions of fault components of voltage and current are opposite at the two ends of the transmission line, indicating a huge difference of wavelet energy relative entropy; for external faults, the directions are identical, indicating a small difference. The simulation results based on PSCAD/EMTDC show that the proposed pilot protection system acts accurately for faults under different conditions, and its performance is not affected by fault type, fault location, fault resistance and noise.
引用
收藏
页码:5257 / 5273
页数:17
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