An improved DC fault protection scheme independent of boundary components for MMC based HVDC grids

Yang, Saizhao and Xiang, Wang and Wen, Jinyu (2020) An improved DC fault protection scheme independent of boundary components for MMC based HVDC grids. IEEE Transactions on Power Delivery. ISSN 0885-8977 (https://doi.org/10.1109/TPWRD.2020.3029308)

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Abstract

For Modular Multilevel Converter (MMC) based DC grids, current-limiting reactors (CLRs) are mainly employed to suppress the fault current and provide boundary effects to detect internal faults. Thus, most existing protection schemes are highly dependent on the larger CLRs to guarantee high selectivity. However, in existing MMC based HVDC projects, the size of CLRs is restrained by the cost, weight and system stability under normal state. Thus, boundary protections may fail to detect high-resistance faults and pole-to-ground faults. To overcome these shortcomings, this paper proposes a fast and selective DC fault detection algorithm independent of boundary components. The propagation characteristics of line-mode backward traveling-waves (TW) are analyzed to identify external and internal faults. The polarities of zero-mode backward TWs are employed to select faulted poles. To detect remote faults, a pilot protection scheme based on the directional overcurrent is adopted as the complementary criterion. The detection speed of the proposed protection is fast, with a delay less than 1.1ms. Besides, it is robust to fault resistance and immune to noise. Various simulation results in PSCAD/EMTDC demonstrate that the proposed method is not affected by AC faults, fault distances and fault types

  • Item type:Article
    ID code:74228
    Dates:
    Date
    Event
    7 October 2020
    Published
    7 October 2020
    Published Online
    5 October 2020
    Accepted
    Notes:© 2020 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:Technology > Electrical engineering. Electronics Nuclear engineering
    Department:Faculty of Engineering > Electronic and Electrical Engineering
    Depositing user: Pure Administrator
    Date deposited:13 Oct 2020 13:40
    Last modified:09 Apr 2024 08:42
    URI:https://strathprints.strath.ac.uk/id/eprint/74228
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