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    Control and protection of a microgrid connected to utility through back-to-back converters

    Access Status
    Fulltext not available
    Authors
    Majumder, R.
    Dewadasa, M.
    Ghosh, Arindam
    Ledwich, G.
    zare, F.
    Date
    2011
    Type
    Journal Article
    
    Metadata
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    Citation
    Majumder, R. and Dewadasa, M. and Ghosh, A. and Ledwich, G. and zare, F. 2011. Control and protection of a microgrid connected to utility through back-to-back converters. Electric Power Systems Research. 81 (7): pp. 1424-1435.
    Source Title
    Electric Power Systems Research
    ISSN
    0378-7796
    URI
    http://hdl.handle.net/20.500.11937/6566
    Collection
    • Curtin Research Publications
    Abstract

    This paper discusses the control and protection of a microgrid that is connected to utility through backto-back converters. The back-to-back converter connection facilitates bidirectional power flow between the utility and the microgrid. These converters can operate in two different modes–one in which a fixed amount of power is drawn from the utility and the other in which the microgrid power shortfall is supplied by the utility. In the case of a fault in the utility or microgrid side, the protection system should act not only to clear the fault but also to block the back-to-back converters such that its dc bus voltage does not fall during fault. Furthermore, a converter internal mechanism prevents it from supplying high current during a fault and this complicates the operation of a protection system. To overcome this, an admittance based relay scheme is proposed, which has an inverse time characteristic based on measured admittance of the line. The proposed protection and control schemes are able to ensure reliable operation of the microgrid.

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