Voltage Control for Unbalanced Low Voltage Grids Using a Decoupled-Phase On-Load Tap-Changer Transformer and Photovoltaic Inverters

Antonio Zecchino, Mattia Marinelli, Junjie Hu, Massimiliano Coppo, Roberto Turri

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    Abstract

    This paper presents modeling and analysis of the potential benefits of joint actions of a MV/LV three-phase power distribution transformer with independent on-load tap-changer control on each phase and photovoltaic inverters provided with reactive power control capability, in terms of accommodating more renewable generations in the LV grid. The potential benefits are investigated in terms of voltage unbalance reduction and local voltage regulation. 24-hours root-mean-square dynamics simulation studies have been carried out with timestep of 1 second using 10-mins resolution consumption and production profiles. A totally passive real Danish low voltage distribution network is used for the grid topology as well as for the characterization of loads profiles, while the production ones are empirically defined under assumptions in scenarios with different level of photovoltaic penetration and grade of unbalance.
    Original languageEnglish
    Title of host publicationProceedings of 2015 50th International Universities Power Engineering Conference (UPEC)
    Number of pages6
    PublisherIEEE
    Publication date2015
    ISBN (Print)9781467396820
    DOIs
    Publication statusPublished - 2015
    Event50th International Universities Power Engineering Conference - Staffordshire University, Staffordshire, United Kingdom
    Duration: 1 Sept 20154 Sept 2015
    Conference number: 50
    http://www.upec2015.com/

    Conference

    Conference50th International Universities Power Engineering Conference
    Number50
    LocationStaffordshire University
    Country/TerritoryUnited Kingdom
    CityStaffordshire
    Period01/09/201504/09/2015
    Internet address

    Keywords

    • On-Load Tap-Changer
    • Unbalanced Low Voltage Grid
    • Photovoltaic Hosting Capacity
    • Photovoltaic Inverter
    • Power Transformer
    • Reactive Power Control
    • Voltage Control

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