A novel converter station structure for improving multi-terminal HVDC system resiliency against AC and DC faults

Wang, Shuren and Ahmed, Khaled H. and Adam, Grain P. and Massoud, Ahmed M. and Williams, Barry W. (2019) A novel converter station structure for improving multi-terminal HVDC system resiliency against AC and DC faults. IEEE Transactions on Industrial Electronics. ISSN 0278-0046 (https://doi.org/10.1109/TIE.2019.2926036)

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Abstract

In an effort to minimize the power disruption between a dc grid and ac grids that host power converters during ac and dc network faults, this paper proposes a novel converter station structure to improve ac and dc fault ride-through performance of the multi-terminal HVDC grid. The proposed structure consists of two independent ac and dc interfacing circuits, which are a half-bridge modular multilevel converter and a cascaded H-bridge (CHB) based energy storage system. Taking the advantages of high controllability and flexibility of the independent CHB converter and ease of integrating energy modules, a decoupled power relationship between the ac and dc sides is achieved, which is important for enhancing ac and dc fault performance. Operation of the proposed converter station under normal conditions and during ac and dc faults is explained, with the control system presented. Simulation validation of the proposed structure on a three-terminal HVDC grid confirms the enhanced performance, including the continuous operation during ac and dc faults with negligible power transfer disruption.

  • Item type:Article
    ID code:68566
    Dates:
    Date
    Event
    9 July 2019
    Published
    9 July 2019
    Published Online
    9 June 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:21 Jun 2019 14:09
    Last modified:09 Apr 2024 08:36
    URI:https://strathprints.strath.ac.uk/id/eprint/68566
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