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Zheng, J.C., Wen, M.H., Qin, Y., Wang, X.Z. and Bai, Y. (2020) A Novel Pilot Directional Backup Protection Scheme Based on Transient Currents for HVDC Lines. International Journal of Electrical Power and Energy Systems, 115, Article ID: 105424. https://doi.org/10.1016/j.ijepes.2019.105424

has been cited by the following article:

• TITLE: A Protection Method of VSC-HVDC Cables Based on Generalized S-Transform

  AUTHORS: Weishi Man, Xiaoman Bei, Zhiyu Zhang

  KEYWORDS: Generalized S-Transform, VSC-HVDC, Phase-Mode Transformation, DC Cable Protection

  JOURNAL NAME: Energy and Power Engineering, Vol.13 No.4B, April 8, 2021

  ABSTRACT: Generalized S-transform is a time-frequency analysis method which has higher resolution than S-transform. It can precisely extract the time-amplitude characteristics of different frequency components in the signal. In this paper, a novel protection method for VSC-HVDC (Voltage source converter based high voltage DC) based on Generalized S-transform is proposed. Firstly, extracting frequency component of fault current by Generalized S-transform and using mutation point of high frequency to determine the fault time. Secondly, using the zero-frequency component of fault current to eliminate disturbances. Finally, the polarity of sudden change currents in the two terminals is employed to discriminate the internal and external faults. Simulations in PSCAD/EMTDC and MATLAB show that the proposed method can distinguish faults accurately and effectively.