An approximated analytical model for pole-to-ground faults in symmetrical monopole MMC-HVDC systems

Lacerda, Vinicius A. and Monaro, Renato M. and Campos-Gaona, David and Peña-Alzola, Rafael and Coury, Denis V. (2020) An approximated analytical model for pole-to-ground faults in symmetrical monopole MMC-HVDC systems. IEEE Journal of Emerging and Selected Topics in Power Electronics. ISSN 2168-6777 (https://doi.org/10.1109/JESTPE.2020.3028937)

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Abstract

Developing pole-to-ground (PG) fault models for Modular Multilevel Converters (MMC) is not straightforward due to the fault asymmetry and converter switching concerning blocking characteristics. Various studies have been carried out regarding transient simulation of PG faults. However, there is a lack of analytical models for the first stage of the fault. Therefore, this work proposes an approximated analytical model for PG faults in half-bridge MMCs. Closed-form expressions for the MMC contribution to the fault and the fault current are derived. We show that separating the solutions in different resonant frequencies represents the system dynamics and facilitates the interpretation of the phenomena. When compared to system calculated by Ordinary Differential Equations (ODEs), the proposed model provided a good approximation for a wide range of parameters. When compared to the full PSCAD solution, the analytical model was able to precisely calculate the peak fault current value, which confirmed its validity.

  • Item type:Article
    ID code:76170
    Dates:
    Date
    Event
    6 October 2020
    Published
    6 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:22 Apr 2021 09:21
    Last modified:05 May 2024 01:49
    URI:https://strathprints.strath.ac.uk/id/eprint/76170
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