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    Primary control level of parallel DER converters in system of multiple interconnected autonomous microgrids within self-healing networks

    196332.pdf (2.000Mb)
    Access Status
    Open access
    Authors
    Shahnia, Farhad
    Chandrasena, R.
    Rajakaruna, Sumedha
    Ghosh, Arindam
    Date
    2014
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Shahnia, Farhad and Chandrasena, Ruwan and Rajakaruna, Sumedha and Ghosh, Arindam. 2014. Primary control level of parallel DER converters in system of multiple interconnected autonomous microgrids within self-healing networks. IET Generation, Transmission and Distribution. 8 (2): pp. 203-222.
    Source Title
    IET Generation, Transmission and Distribution
    DOI
    10.1049/iet-gtd.2013.0126
    ISSN
    1751-8687
    Remarks

    This paper is a postprint of a paper submitted to and accepted for publication in IET Generation, Transmission and Distribution and is subject to Institution of Engineering and Technology Copyright. The copy of record is available at IET Digital Library.

    URI
    http://hdl.handle.net/20.500.11937/22435
    Collection
    • Curtin Research Publications
    Abstract

    To minimise the number of load sheddings in a microgrid (MG) during autonomous operation, islanded neighbour MGs can be interconnected if they are on a self-healing network and an extra generation capacity is available in the distributed energy resources (DER) of one of the MGs. In this way, the total load in the system of interconnected MGs can be shared by all the DERs within those MGs. However, for this purpose, carefully designed self-healing and supply restoration control algorithm, protection systems and communication infrastructure are required at the network and MG levels. In this study, first, a hierarchical control structure is discussed for interconnecting the neighbour autonomous MGs where the introduced primary control level is the main focus of this study. Through the developed primary control level, this study demonstrates how the parallel DERs in the system of multiple interconnected autonomous MGs can properly share the load of the system. This controller is designed such that the converter-interfaced DERs operate in a voltage-controlled mode following a decentralised power sharing algorithm based on droop control. DER converters are controlled based on a per-phase technique instead of a conventional direct-quadratic transformation technique. In addition, linear quadratic regulator-based state feedback controllers, which are more stable than conventional proportional integrator controllers, are utilised to prevent instability and weak dynamic performances of the DERs when autonomous MGs are interconnected. The efficacy of the primary control level of the DERs in the system of multiple interconnected autonomous MGs is validated through the PSCAD/EMTDC simulations considering detailed dynamic models of DERs and converters.

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