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    Droop control in low voltage islanded microgrids for sharing nonlinear and unbalanced loads

    Access Status
    Fulltext not available
    Authors
    John, B.
    Ghosh, A.
    Zare, Firuz
    Date
    2017
    Type
    Conference Paper
    
    Metadata
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    Citation
    John, B. and Ghosh, A. and Zare, F. 2017. Droop control in low voltage islanded microgrids for sharing nonlinear and unbalanced loads.
    Source Title
    TENSYMP 2017 - IEEE International Symposium on Technologies for Smart Cities
    DOI
    10.1109/TENCONSpring.2017.8069980
    ISBN
    9781509062553
    School
    School of Electrical Engineering, Computing and Mathematical Science (EECMS)
    URI
    http://hdl.handle.net/20.500.11937/62332
    Collection
    • Curtin Research Publications
    Abstract

    © 2017 IEEE. This paper proposes a control strategy for sharing load requirements in a low voltage islanded microgrid with converter interfaced distributed energy resources. In high voltage lines with large X/R ratio, real and reactive power are decoupled and thus conventional droop control can effectively share the power needs of the load. However, the same strategy cannot be applicable in dominantly resistive remote microgrids where, X/R ratio is very small. In order to ensure accurate sharing of load power, this paper adopts cut in contrast of conventional angle droop control, where active power sharing is achieved by controlling voltage and reactive power by angle droop method. In addition, virtual resistive output impedance is utilized to effectively decouple real and reactive power. Moreover, this strategy includes influence of line impedance in load power sharing and offers an added advantage of effective overall system damping. Third harmonic injection based pulse width modulation scheme is used for each distributed generators(DGs), which provides better utilization of DC link voltage and suppress neutral currents under unbalanced conditions.

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