An investigation into the limitations of the combined dv/dt and di/dt protection technique for compact d.c. distribution systems

Smith, Allan and Wang, Dong and Emhemed, Abdullah and Burt, Graeme; (2018) An investigation into the limitations of the combined dv/dt and di/dt protection technique for compact d.c. distribution systems. In: 2018 53rd International Universities Power Engineering Conference (UPEC). IEEE, GBR. ISBN 978-1-5386-2910-9 (https://doi.org/10.1109/UPEC.2018.8542108)

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Abstract

d.c. distribution networks interfaced by two-level voltage source converters (VSCs) are characterised by rapid fault current development, which places severe time constraints on d.c. protection. A proposed solution to ease this is the implementation of advanced converters with current management capabilities such as modular multilevel converter (MMC). However, the limited fault current caused by MMC will make the widely used LV current-based protection less effective. A new method, targeted utility-scale LVDC distribution networks at conditions with limited fault current, combining dv/dt and di/dt has been proposed in literature with promising results for fast and selective protection. However, further investigation must be carried out to determine its applicability and limitations for protecting future compact d.c. distribution systems. This paper presents an investigation into the selective capabilities of the combined dv/dt and di/dt protection technique for a range of fault scenarios. The study considers the effects of sampling frequency, fault locations, and the network architecture with the aim of determining the limitations of the protection method. A simplified converter model with active fault current limiting and blocking capabilities is built in PSCAD/EMTDC and implemented in a radial and ring compact d.c. distribution network to facilitate the study.

ORCID iDs

Smith, Allan, Wang, Dong, Emhemed, Abdullah ORCID logoORCID: https://orcid.org/0000-0002-4635-0167 and Burt, Graeme ORCID logoORCID: https://orcid.org/0000-0002-0315-5919;
  • Item type:Book Section
    ID code:72762
    Dates:
    Date
    Event
    4 September 2018
    Published
    22 June 2018
    Published Online
    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:Technology > Electrical engineering. Electronics Nuclear engineering
    Department:Faculty of Engineering > Electronic and Electrical Engineering
    Depositing user: Pure Administrator
    Date deposited:16 Jun 2020 11:04
    Last modified:11 Nov 2024 15:21
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/72762
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