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    Fault ride-through capability enhancement of doubly-fed induction wind generators

    Access Status
    Fulltext not available
    Authors
    Mohseni, Mansour
    Islam, Syed
    Masoum, Mohammad Sherkat
    Date
    2011
    Type
    Journal Article
    
    Metadata
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    Citation
    Mohseni, M. and Islam, S. and Masoum, M. 2011. Fault ride-through capability enhancement of doubly-fed induction wind generators. IET Renewable Power Generation. 5 (5): pp. 368-376.
    Source Title
    IET Renewable Power Generation
    DOI
    10.1049/iet-rpg.2010.0154
    ISSN
    17521416
    School
    Department of Electrical and Computer Engineering
    URI
    http://hdl.handle.net/20.500.11937/4081
    Collection
    • Curtin Research Publications
    Abstract

    Recent fault ride-through (FRT) requirements have proven problematic for variable-speed wind generation systems. A particular problem regarding to doubly-fed induction generators (DFIGs) is that standard proportional integral (PI) current controllers, designed with very limited control bandwidth, cannot eliminate rotor current oscillations that occur during a grid fault. As a consequence, the current in the rotor-side converter can exceed the safety limits of semiconductor switches, which potentially leads to converter failure. This study introduces a hybrid current controller to enhance the FRT capability of DFIGs through keeping the rotor current below the safety limits. The proposed current controller includes two switching strategies: the standard PI current controller for normal operating conditions and a vector-based hysteresis current controller (with very fast transient response) for overcurrent protection during grid faults. Simulation studies are carried out to demonstrate the effectiveness of the proposed hybrid current controller under various symmetrical and asymmetrical voltage sag conditions.

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