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Entropy 2015, 17(8), 5257-5273; doi:10.3390/e17085257

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

School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610031, China
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Author to whom correspondence should be addressed.
Academic Editor: Raúl Alcaraz Martínez
Received: 29 May 2015 / Revised: 13 July 2015 / Accepted: 20 July 2015 / Published: 27 July 2015
(This article belongs to the Special Issue Wavelet Entropy: Computation and Applications)
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Abstract

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. View Full-Text
Keywords: wavelet transform; relative entropy of wavelet energy; HVDC transmission system; direction feature; fault components of voltage and current; pilot protection wavelet transform; relative entropy of wavelet energy; HVDC transmission system; direction feature; fault components of voltage and current; pilot protection
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Lin, S.; Gao, S.; He, Z.; Deng, Y. A Pilot Directional Protection for HVDC Transmission Line Based on Relative Entropy of Wavelet Energy. Entropy 2015, 17, 5257-5273.

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