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    Power sharing and stability enhancement of an autonomous microgrid with inertial and non-inertial DGs with DSTATCOM

    Access Status
    Fulltext not available
    Authors
    Majumder, R.
    Ghosh, Arindam
    Ledwich, G.
    zare, F.
    Date
    2009
    Type
    Conference Paper
    
    Metadata
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    Citation
    Majumder, R. and Ghosh, A. and Ledwich, G. and zare, F. 2009. Power sharing and stability enhancement of an autonomous microgrid with inertial and non-inertial DGs with DSTATCOM, in - (ed), 2009 International Conference on Power Systems, ICPS '09, Dec 27 2009. India: Institute of Electrical and Electronics Engineers ( IEEE ).
    Source Title
    2009 International Conference on Power Systems, ICPS '09
    Source Conference
    2009 International Conference on Power Systems, ICPS '09
    ISBN
    978-1-4244-4330-7
    URI
    http://hdl.handle.net/20.500.11937/7986
    Collection
    • Curtin Research Publications
    Abstract

    This paper proposes a method of enhancing system stability with a distribution static compensator (DSTATCOM) in an autonomous microgrid with multiple distributed generators (DG). It is assumed that there are both inertial and non-inertial DGs connected to the microgrid. The inertial DG can be a synchronous machine of smaller rating while inertia less DGs (solar) are assumed as DC sources. The inertia less DGs are connected through Voltage Source Converter (VSC) to the microgrid. The VSCs are controlled by either state feedback or current feedback mode to achieve desired voltage-current or power outputs respectively. The power sharing among the DGs is achieved by drooping voltage angle. Once the reference for the output voltage magnitude and angle is calculated from the droop, state feedback controllers are used to track the reference. The angle reference for the synchronous machine is compared with the output voltage angle of the machine and the error is fed to a PI controller. The controller output is used to set the power reference of the synchronous machine. The rate of change in the angle in a synchronous machine is restricted by the machine inertia and to mimic this nature, the rate of change in the VSCs angles are restricted by a derivative feedback in the droop control. The connected distribution static compensator (DSTATCOM) provides ride through capability during power imbalance in the microgrid, especially when the stored energy of the inertial DG is not sufficient to maintain stability. The inclusion of the DSATCOM in such cases ensures the system stability. The efficacies of the controllers are established through extensive simulation studies using PSCAD.

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