A Novel Fault-location Method for HVDC Transmission Lines Based on Concentric Relaxation Principle and Wavelet Packet

Author(s): Congshan Li*, Ping He, Feng Wang, Cunxiang Yang, Yukun Tao, Yuqi Ji

Journal Name: Recent Advances in Electrical & Electronic Engineering
Formerly Recent Patents on Electrical & Electronic Engineering

Volume 13 , Issue 5 , 2020


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Graphical Abstract:


Abstract:

Background: A novel fault location method of HVDC transmission line based on a concentric relaxation principle is proposed in this paper.

Methods: Due to the different position of fault, the instantaneous energy measured from rectifier and inverter are different, and the ratio k between them is the relationship to the fault location d. Through the analysis of amplitude-frequency characteristics, we found that the wave attenuation characteristic of low frequency in the traveling wave is stable, and the amplitude of energy is larger, so we get the instantaneous energy ratio by using the low-frequency data. By using the method of wavelet packet decomposition, the voltage traveling wave signal was decomposed.

Results: Finally, calculate the value k. By using the data fitting, the relative function of k and d can be got, that is the fault location function.

Conclusion: After an exhaustive evaluation process considering different fault locations, fault resistances, and noise on the unipolar DC transmission system, four-machine two-area AC/DC parallel system, and an actual complex grid, the method presented here showed a very accurate and robust behavior.

Keywords: HVDC, fault location, concentric relaxation, instantaneous energy ratio, wavelet packet decomposition.

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Article Details

VOLUME: 13
ISSUE: 5
Year: 2020
Published on: 22 September, 2020
Page: [705 - 716]
Pages: 12
DOI: 10.2174/2213111607666191003105654

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