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    Improvement of stability and load sharing in an autonomous microgrid using supplementary droop control loop

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    Fulltext not available
    Authors
    Majumder, R.
    Chaudhuri, B.
    Ghosh, Arindam
    Majumder, R.
    Ledwich, G.
    zare, F.
    Date
    2010
    Type
    Journal Article
    
    Metadata
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    Citation
    Majumder, R. and Chaudhuri, B. and Ghosh, A. and Majumder, R. and Ledwich, G. and zare, F. 2010. Improvement of stability and load sharing in an autonomous microgrid using supplementary droop control loop. IEEE Transactions on Power Systems. 25 (2): pp. 796-808.
    Source Title
    IEEE Transactions on Power Systems
    ISSN
    0885-8950
    URI
    http://hdl.handle.net/20.500.11937/23920
    Collection
    • Curtin Research Publications
    Abstract

    This paper investigates the problem of appropriate load sharing in an autonomous microgrid. High gain angle droop control ensures proper load sharing, especially under weak system conditions. However, it has a negative impact on overall stability. Frequency-domain modeling, eigenvalue analysis, and time-domain simulations are used to demonstrate this conflict. A supplementary loop is proposed around a conventional droop control of each DG converter to stabilize the system while using high angle droop gains. Control loops are based on local power measurement and modulation of the d-axis voltage reference of eachconverter. Coordinated design of supplementary control loops for each DG is formulated as a parameter optimization problem and solved using an evolutionary technique. The supplementary droop control loop is shown to stabilize the system for a range of operating conditions while ensuring satisfactory load sharing.

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