A differential pilot protection scheme for MMC based DC grid resilient to communication failure

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Xiang, Wang and Zhang, Haobo and Yang, Saizhao and Zhou, Meng and Lin, Weixing and Wen, Jinyu (2021) A differential pilot protection scheme for MMC based DC grid resilient to communication failure. IEEE Journal of Emerging and Selected Topics in Power Electronics, 9 (5). 5631 - 5645. ISSN 2168-6777 (https://doi.org/10.1109/JESTPE.2020.3035672)

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Abstract

Primary single-end line protection strategies of MMC HVDC systems are difficult to make a tradeoff between fast detection speed and high reliability. To improve reliability, the pilot protection schemes based on communication and data exchange can be adopted. However, the communication-based schemes suffer from potential communication failure problems, such as data error, data loss and time synchronization error. To avoid blocking of protection devices during communication failures, a resilience-oriented differential pilot protection method is proposed in this paper. To address the problem of synchronization error, a startup element based on the multi-resolution morphological gradient (MMG) of traveling wave is proposed. For the problems of data error and data loss in communication, the sampled data are preprocessed by the morphological filtering (MF). And the correlation of traveling waves is used to identify the internal and external faults; the ratio of the morphological gradient of pole voltages is adopted to discriminate the faulty poles. A four-terminal MMC based DC grid model is built in PSCAD/EMTDC interfaced with the optical fiber-based communication system built in MATLAB/Simulink. The simulation results show that the protection scheme can effectively identify the faults against serious communication problems of 1% bit error rate and 5% data loss.

ORCID iDs

Xiang, Wang ORCID logoORCID: https://orcid.org/0000-0002-4619-5849, Zhang, Haobo, Yang, Saizhao, Zhou, Meng, Lin, Weixing and Wen, Jinyu;
  • Item type:Article
    ID code:76894
    Dates:
    Date
    Event
    October 2021
    Published
    3 November 2020
    Published Online
    30 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:28 Jun 2021 15:27
    Last modified:19 Dec 2024 03:53
    URI:https://strathprints.strath.ac.uk/id/eprint/76894
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