A unidirectional hybrid HVDC transmission system based on diode rectifier and full-bridge MMC

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Li, Rui and Xu, Lie (2020) A unidirectional hybrid HVDC transmission system based on diode rectifier and full-bridge MMC. IEEE Journal of Emerging and Selected Topics in Power Electronics. ISSN 2168-6777 (https://doi.org/10.1109/JESTPE.2020.3015342)

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Abstract

To reduce the cost of bulk power transmission using voltage source converter HVDC technology, a unidirectional hybrid converter is proposed, where a diode rectifier and a modular multilevel converter (MMC) based on full-bridge (FB) submodules are connected in series on DC side. The FB-MMC controls its DC voltage to regulate the transmitted power. The majority of the power transmission is via the diode rectifier considering its cost and efficiency superiority and only low power rating FB-MMC is required. A thyristor valve is equipped at the DC side of the FB-MMC to prevent potential overcharge of the FB submodules during DC faults. Compared to conventional MMCs, losses can potentially be reduced by around 20%. An active power controller is proposed to regulate the DC voltage of the FB-MMC so as to control the transmitted power. With the inverter station controlling its DC terminal voltage constant, the FB-MMC increases the output DC voltage to increase the transmitted power and, vice versa. To alleviate overvoltage of the HVDC link during AC grid faults of the inverter station, a dynamic DC voltage limiter is designed to actively reduce the DC output voltage of the FB-MMC. Simulation results confirm the proposed converter operation and control.

ORCID iDs

Li, Rui ORCID logoORCID: https://orcid.org/0000-0001-8990-7546 and Xu, Lie ORCID logoORCID: https://orcid.org/0000-0001-5633-7866;
  • Item type:Article
    ID code:73572
    Dates:
    Date
    Event
    10 August 2020
    Published
    10 August 2020
    Published Online
    6 August 2020
    Accepted
    Notes:(c) 2020 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, 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 components 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:12 Aug 2020 14:09
    Last modified:02 Dec 2024 01:23
    URI:https://strathprints.strath.ac.uk/id/eprint/73572
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