Capacitive earthing charge-based method for locating faults within a DC microgrid

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Makkieh, Ahmad and Emhemed, Abdullah and Pena-Alzola, Rafael and Burt, Graeme and Junyent-Ferre, Adria; (2019) Capacitive earthing charge-based method for locating faults within a DC microgrid. In: 2019 3rd IEEE International Conference on DC Microgrids (ICDCM). IEEE, Piscataway, NJ., pp. 1-6.

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Abstract

This paper presents a new fault location method using capacitive earthing charge current combined with moving average and Savitzky-Golay filters. Locating a DC fault in a DC microgrid can be challenging due to reduced fault current magnitudes, resulting either from high resistive faults, or during the transition between grid-connected and islanded modes. The capacitive earthing method is proposed for earthing DC systems to avoid the corrosion of earthed metallic surfaces. Under different fault conditions and at different locations, the capacitive earthing with the earth path, charges a transient current with a peak value that depends on the initial voltage of the capacitor and the fault loop between the capacitor and the fault point. Therefore, this paper utilises earth capacitor pre-fault voltages, transient current peak and the derivative current of the capacitive earthing to estimate the total inductance of the fault loop. This in turn can be used to determine the location of DC faults. This paper also quantifies the impact that resistive faults have on the accuracy of the method, especially when the resistance of the fault dominates the total fault loop. The ability to distinguish between downstream and upstream faults with respect to the earthing point location also adds significant value to the proposed method. The proposed fault location technique is tested against pole-to-earth fault at different locations using Matlab-Simulink.

ORCID iDs

Makkieh, Ahmad, Emhemed, Abdullah ORCID logoORCID: https://orcid.org/0000-0002-4635-0167, Pena-Alzola, Rafael, Burt, Graeme ORCID logoORCID: https://orcid.org/0000-0002-0315-5919 and Junyent-Ferre, Adria;
  • Item type:Book Section
    ID code:67284
    Dates:
    Date
    Event
    20 May 2019
    Published
    28 February 2019
    Accepted
    Notes:© 2019 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:12 Mar 2019 14:22
    Last modified:12 Dec 2024 01:21
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/67284
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