Offshore AC fault protection of diode rectifier unit based HVDC system for wind energy transmission

Li, Rui and Yu, Lujie and Xu, Lie (2018) Offshore AC fault protection of diode rectifier unit based HVDC system for wind energy transmission. IEEE Transactions on Industrial Electronics. ISSN 0278-0046 (In Press)

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Abstract

Offshore AC fault protection of wind turbines (WTs) connecting with diode rectifier unit based HVDC (DRU-HVDC) system is investigated in this paper. A voltage-error-dependent fault current injection is proposed to regulate the WT current during offshore AC fault transients and quickly provide fault current for fault detection. Considering different fault locations, the fault characteristics during symmetrical and asymmetrical faults are presented and the requirements for fault detection are addressed. A simple and effective offshore AC fault protection solution, combining both overcurrent protection and differential protection, is proposed by utilizing the developed fast fault current providing control. To improve system availability, reduced DC voltage of the DRU-HVDC system is investigated, where one of the series-connected DRUs is disconnected and the onshore modular multilevel converter (MMC) actively reduces DC voltage to resume wind power transmission. The proposed scheme is robust to various offshore AC faults and can automatically restore normal operation. Simulation results confirm the proposed fault protection strategy.

  • Item type:Article
    ID code:65376
    Dates:
    Date
    Event
    29 August 2018
    Published
    29 August 2018
    Accepted
    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:05 Sep 2018 14:11
    Last modified:22 Apr 2024 00:39
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/65376
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