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access icon free Line fault location for multi-terminal MMC-HVDC system based on SWT and SVD

  • Author(s): Qing Huai 1, 2 ; Kaipei Liu 1 ; Ali Hooshyar 2 ; Hua Ding 3 ; Liang Qin 1 ; Kun Chen 4
    • View affiliations
  • Source: Volume 14, Issue 19, 28 December 2020, p. 4043 – 4052
    DOI:  10.1049/iet-rpg.2020.0702 , Print ISSN 1752-1416, Online ISSN 1752-1424
© The Institution of Engineering and Technology
Received 11/06/2020, Accepted 10/11/2020, Revised 24/10/2020, Published 18/12/2020

This study presents a travelling wave (TW)-based method for locating DC line faults in a modular multilevel converter (MMC)-based high-voltage direct current (HVDC) system by using local information. Pole voltage signals are adopted and denoised via stationary wavelet transform (SWT) with improved threshold functions. Hankel matrix-based singular value decomposition (SVD) is utilised to detect TW arrivals. The arrival times of incidental and reflected wave heads are observed in SVD result. The reflected wave heads from the fault point and the opposite end can be discriminated by comparing surge polarities in SVD result. The proposed method relies on the TW principle but is independent of TW propagation velocity. The feasibility of the proposed algorithm is evaluated considering potential factors, such as fault resistance, close-in fault, remote fault, sampling rate and noise. The superiority of this method is validated by comparing it with other signal-processing techniques and TW-based fault location principles. Electromagnetic transient simulation of the multi-terminal HVDC system on Power Systems Computer Aided Design / Electromagnetic Transients including DC (PSCAD/EMTDC) is conducted to provide fault TW signals, which are analysed in MATLAB. A corresponding equivalent test model developed in a real-time digital simulator is also provided for conducting a supplementary study to verify and further research this fault location method.

Inspec keywords: power transmission protection; singular value decomposition; wavelet transforms; power transmission faults; HVDC power convertors; HVDC power transmission; fault location

Other keywords: SVD result; line fault location; local information; multiterminal HVDC system; direct current system; improved threshold functions; pole voltage signals; TW-based fault location principles; wave heads; SWT; TW principle; TW propagation velocity; fault resistance; multiterminal MMC-HVDC system; fault point; hankel matrix-based singular value decomposition; remote fault; modular multilevel converter-based high-voltage; TW arrivals; locating DC line faults; travelling wave-based method; arrival times; fault TW signals; stationary wavelet; signal-processing techniques

Subjects: Power engineering computing; Integral transforms; Power system protection; Signal processing and detection; d.c. transmission; Algebra

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