A hybrid modular multilevel converter with reduced full-bridge submodules

Li, Rui and Xu, Lie and YU, Lujie and Yao, Liangzhong (2019) A hybrid modular multilevel converter with reduced full-bridge submodules. IEEE Transactions on Power Delivery. ISSN 0885-8977 (In Press)

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Abstract

A hybrid modular multilevel converter (MMC) with reduced full-bridge (FB) submodules (SMs) is proposed, where a high voltage rating half-bridge (HB) based MMC is connected in series with a low voltage rating FB-MMC in parallel with a fault breaking circuit on its DC side. Unlike conventional hybrid MMCs with mixed HB and FB SMs, the proposed topology uses the DC capacitor in the fault breaking circuit to block DC faults, while the FB-MMC only commutates the fault current from the FB-MMC to the fault breaking circuit. Thus, the proposed converter only requires around 10%-20% FB SMs, leading to reduced capital cost and losses compared to typical hybrid MMC. The optimal ratio of the FB-MMC and HB-MMC is assessed and comparative studies show superiority of the proposed topology over other alternatives. A case study with 10% FB SMs demonstrates the validity of the proposed hybrid MMC for DC fault blocking and post-fault system restart.

ORCID iDs

Li, Rui ORCID logoORCID: https://orcid.org/0000-0001-8990-7546, Xu, Lie ORCID logoORCID: https://orcid.org/0000-0001-5633-7866, YU, Lujie ORCID logoORCID: https://orcid.org/0000-0002-0889-7751 and Yao, Liangzhong;
  • Item type:Article
    ID code:70661
    Dates:
    Date
    Event
    25 November 2019
    Published
    25 November 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:28 Nov 2019 14:11
    Last modified:11 Nov 2024 12:31
    URI:https://strathprints.strath.ac.uk/id/eprint/70661
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