Current-source modular medium-voltage grid-connected system with high-frequency isolation for photovoltaic applications

Darwish, Ahmed and Elgenedy, Mohamed A. (2018) Current-source modular medium-voltage grid-connected system with high-frequency isolation for photovoltaic applications. IEEE Transactions on Energy Conversion. ISSN 0885-8969 (https://doi.org/10.1109/TEC.2018.2876969)

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Abstract

Large-scale grid-connected photovoltaic energy generation systems are progressing remarkably benefiting from the latest developments in solid-state semiconductors technology. In such systems, the photovoltaic arrays can be connected directly to the medium-voltage grid without employing a bulky line-frequency transformer to step up the voltage. Nanocrystalline cores with a small size and a high permeability operating at medium or high frequency can be installed in the power conversion stage. Hence, the necessary isolation as well as voltage boosting features can be provided. However, only a few power converters allow this type of isolation. This paper proposes a new modular converter structure suitable for medium-voltage grid connected systems with high-frequency isolation. The output voltages of the series-connected modules are added in order to provide the necessary voltage boosting. Four different power converter topologies with small input capacitors can be used as submodules for the presented medium-voltage configuration having different advantages and drawbacks. These different topologies are analysed in terms of power losses, footprint and functionality. To validate the mathematical analysis and the computer simulations, a scaled-down 5 kVA three-phase, 1 kV prototype is built and tested with four modules for each phase.

  • Item type:Article
    ID code:65873
    Dates:
    Date
    Event
    19 October 2018
    Published
    19 October 2018
    Published Online
    27 September 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:26 Oct 2018 14:24
    Last modified:09 Apr 2024 00:22
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/65873
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