A new hybrid dual active bridge modular multilevel based DC-DC converter for HVDC networks

Ashraf, Mohamed and Nazih, Yousef and Alsokhiry, Fahad and Ahmed, Khaled H. and Abdel-Khalik, Ayman S. and Al-Turki, Yusuf (2021) A new hybrid dual active bridge modular multilevel based DC-DC converter for HVDC networks. IEEE Access, 9. pp. 62055-62073. ISSN 2169-3536 (https://doi.org/10.1109/ACCESS.2021.3074543)

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Abstract

Multi-terminal high voltage DC transmission currently represents a leading technology in long-distance power transmission systems. Among the main technical challenges facing such technology, DC fault isolation, permitting different grounding schemes, providing interoperability, and high DC voltage stepping between different HVDC networks, and allowing high-speed power reversal without power interruption especially when connecting the pre-existing voltage source converters (VSC) and line commutated converters (LCC)-based HVDC networks. This paper introduces a new modular multilevel converter (MMC) based front-to-front DC-DC converter to interconnect two different types (LCC/VSC) of HVDC networks. The proposed topology comprises a voltage source MMC (VS-MMC) and a current source MMC (CS-MMC), while both are coupled via an AC link including the isolating transformer. The proposed topology can successfully provide an uninterruptible bi-directional power flow, high DC voltage stepping with a DC fault blocking capability, and low number of semiconductors due to the usage of only half-bridge SMs. The system design is provided with a detailed mathematical analysis. Furthermore, two active power control methodologies are proposed and compared. The first control technique is simpler and entails lower passive elements, while the second technique ensures a zero reactive power over the full range of active power flow. Furthermore, Losses analysis and comparison are provided between the two proposed control techniques. Finally, Control-Hardware-in-the-Loop (CHiL) test validation is employed to confirm the validity of the proposed system under healthy as well as different fault scenarios.

  • Item type:Article
    ID code:76098
    Dates:
    Date
    Event
    20 April 2021
    Published
    20 April 2021
    Published Online
    13 April 2021
    Accepted
    6 April 2021
    Submitted
    Notes:© 2021 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:Strategic Research Themes > Energy
    Faculty of Engineering > Electronic and Electrical Engineering
    Depositing user: Pure Administrator
    Date deposited:15 Apr 2021 10:10
    Last modified:17 Apr 2024 00:43
    URI:https://strathprints.strath.ac.uk/id/eprint/76098
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