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Investigation of Grid-connected Voltage Source Converter Performance under Unbalanced Faults

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    Abstract

    Renewable energy sources (RES) and HVDC links are typically interfaced with the grid by power converters, whose performance during grid faults is significantly different from that of traditional synchronous generators. This paper investigates the performance of grid-connected voltage source converters (VSCs) under unbalanced faults. Conventional positive-sequence synchronous reference frame (SRF) control is presented first, followed by three different negative-sequence current control strategies considering reactive power injection and converter current limit. The simulation results indicate that the performance of VSCs varies with their control strategies.
    Negative-sequence current control is necessary to restrict converter current in each phase under unbalanced faults. Among presented control strategies, the balanced current control strategy complies with the present voltage support requirement best and further requirements should be specified if a set of controlled unbalanced current is expected under unbalanced faults.
    Original languageEnglish
    Title of host publicationProceedings of 2016 IEEE PES Asia-Pacific Power and Energy Conference
    PublisherIEEE
    Publication date2016
    Pages609-613
    ISBN (Print)978-1-5090-5417-6
    DOIs
    Publication statusPublished - 2016
    Event2016 IEEE PES Asia-Pacific Power and Energy Engineering Conference - Xi'an, China
    Duration: 25 Oct 201628 Oct 2016
    https://ieeexplore.ieee.org/xpl/conhome/7764660/proceeding

    Conference

    Conference2016 IEEE PES Asia-Pacific Power and Energy Engineering Conference
    Country/TerritoryChina
    CityXi'an
    Period25/10/201628/10/2016
    Internet address

    UN SDGs

    This output contributes to the following UN Sustainable Development Goals (SDGs)

    1. SDG 7 - Affordable and Clean Energy
      SDG 7 Affordable and Clean Energy

    Keywords

    • Converter control
    • Fault ride through
    • Reactive power
    • Short circuit current
    • Unbalanced faults

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