A transient voltage based DC fault line protection scheme for MMC based DC grid embedding DC breakers

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Xiang, Wang and Zhan, Junjie and Xu, Lie and Yang, Saizhao and Lin, Weixing and Wen, Jinyu (2018) A transient voltage based DC fault line protection scheme for MMC based DC grid embedding DC breakers. IEEE Transactions on Power Delivery. pp. 1-12. ISSN 0885-8977 (https://doi.org/10.1109/TPWRD.2018.2874817)

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Abstract

Fast and reliable DC fault detection is one of the main challenges for modular multilevel converter (MMC) based DC grid with DC circuit breakers (DCCBs). This paper extracts the high frequency components of transient voltages by wavelet transform and proposes a fault identification method based on the difference of transient voltages to identify the faulted lines for DC grids using overhead lines. Meanwhile, a faulted pole discrimination method based on the difference between the change of positive and negative pole voltages is presented. A line protection scheme including detection activation, fault identification, faulted pole discrimination and post-fault re-closing is designed. Using only the local measurements, the scheme can realize the protection of the whole line without communication and has the capability of fault resistance endurance and anti-disturbance. The proposed method is tested with a four-terminal MMC based DC grid in PSCAD/EMTDC. The selection methods of threshold values are presented and the impact of DCCB operation on the reliability of DC fault protection is analysed. Simulation results verify the fast detection and reliability of the designed DC line protection scheme.

ORCID iDs

Xiang, Wang ORCID logoORCID: https://orcid.org/0000-0002-4619-5849, Zhan, Junjie, Xu, Lie ORCID logoORCID: https://orcid.org/0000-0001-5633-7866, Yang, Saizhao, Lin, Weixing and Wen, Jinyu;
  • Item type:Article
    ID code:65768
    Dates:
    Date
    Event
    8 October 2018
    Published
    8 October 2018
    Published Online
    4 October 2018
    Accepted
    Notes:© 2018 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
    Subjects:Science > Mathematics > Electronic computers. Computer science
    Department:Faculty of Engineering > Electronic and Electrical Engineering
    Depositing user: Pure Administrator
    Date deposited:15 Oct 2018 08:55
    Last modified:30 Nov 2024 01:13
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/65768
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