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Control of Transient Power During Unintentional Islanding of Microgrids.

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Title: Control of Transient Power During Unintentional Islanding of Microgrids.
Authors: Issa, Walid R.1 wrmi201@exeter.ac.uk, Abusara, Mohammad A.1 m.abusara@exeter.ac.uk, Sharkh, Suleiman M.2 suleiman@soton.ac.uk
Source: IEEE Transactions on Power Electronics. Aug2015, Vol. 30 Issue 8, p4573-4584. 12p.
Subjects: Electric controllers, Electric power, Electron tube grids, Electric inverters, Electric potential, Direct currents
Abstract: In inverter-based microgrids, the paralleled inverters need to work in grid-connected mode and stand-alone mode and to transfer seamlessly between the two modes. In grid-connected mode, the inverters control the amount of power injected into the grid. In stand-alonemode, however, the inverters control the island voltage while the output power is dictated by the load. This can be achieved using the droop control. Inverters can have different power set points during grid-connected mode, but in stand-alone mode, they all need their power set points to be adjusted according to their power ratings. However, during sudden unintentional islanding (due to loss of mains), transient power can flow from inverters with high power set points to inverters with low power set points, which can raise the dc-link voltage of the inverters causing them to shut down. This paper investigates the transient circulating power between paralleled inverters during unintentional islanding and proposes a controller to limit it. The controller monitors the dc-link voltage and adjusts the power set point in proportion to the rise in the voltage. A small-signal model of an islanded microgrid is developed and used to design the controller. Simulation and experimental results are presented to validate the design. [ABSTRACT FROM AUTHOR]
Copyright of IEEE Transactions on Power Electronics is the property of IEEE and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
An: 102838436
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  Data: Control of Transient Power During Unintentional Islanding of Microgrids.
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  Data: <searchLink fieldCode="AR" term="%22Issa%2C+Walid+R%2E%22">Issa, Walid R.</searchLink><relatesTo>1</relatesTo><i> wrmi201@exeter.ac.uk</i><br /><searchLink fieldCode="AR" term="%22Abusara%2C+Mohammad+A%2E%22">Abusara, Mohammad A.</searchLink><relatesTo>1</relatesTo><i> m.abusara@exeter.ac.uk</i><br /><searchLink fieldCode="AR" term="%22Sharkh%2C+Suleiman+M%2E%22">Sharkh, Suleiman M.</searchLink><relatesTo>2</relatesTo><i> suleiman@soton.ac.uk</i>
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  Data: <searchLink fieldCode="JN" term="%22IEEE+Transactions+on+Power+Electronics%22">IEEE Transactions on Power Electronics</searchLink>. Aug2015, Vol. 30 Issue 8, p4573-4584. 12p.
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  Data: <searchLink fieldCode="DE" term="%22Electric+controllers%22">Electric controllers</searchLink><br /><searchLink fieldCode="DE" term="%22Electric+power%22">Electric power</searchLink><br /><searchLink fieldCode="DE" term="%22Electron+tube+grids%22">Electron tube grids</searchLink><br /><searchLink fieldCode="DE" term="%22Electric+inverters%22">Electric inverters</searchLink><br /><searchLink fieldCode="DE" term="%22Electric+potential%22">Electric potential</searchLink><br /><searchLink fieldCode="DE" term="%22Direct+currents%22">Direct currents</searchLink>
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  Data: In inverter-based microgrids, the paralleled inverters need to work in grid-connected mode and stand-alone mode and to transfer seamlessly between the two modes. In grid-connected mode, the inverters control the amount of power injected into the grid. In stand-alonemode, however, the inverters control the island voltage while the output power is dictated by the load. This can be achieved using the droop control. Inverters can have different power set points during grid-connected mode, but in stand-alone mode, they all need their power set points to be adjusted according to their power ratings. However, during sudden unintentional islanding (due to loss of mains), transient power can flow from inverters with high power set points to inverters with low power set points, which can raise the dc-link voltage of the inverters causing them to shut down. This paper investigates the transient circulating power between paralleled inverters during unintentional islanding and proposes a controller to limit it. The controller monitors the dc-link voltage and adjusts the power set point in proportion to the rise in the voltage. A small-signal model of an islanded microgrid is developed and used to design the controller. Simulation and experimental results are presented to validate the design. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of IEEE Transactions on Power Electronics is the property of IEEE and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – Type: doi
        Value: 10.1109/TPEL.2014.2359792
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      – Code: eng
        Text: English
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        PageCount: 12
        StartPage: 4573
    Subjects:
      – SubjectFull: Electric controllers
        Type: general
      – SubjectFull: Electric power
        Type: general
      – SubjectFull: Electron tube grids
        Type: general
      – SubjectFull: Electric inverters
        Type: general
      – SubjectFull: Electric potential
        Type: general
      – SubjectFull: Direct currents
        Type: general
    Titles:
      – TitleFull: Control of Transient Power During Unintentional Islanding of Microgrids.
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            NameFull: Abusara, Mohammad A.
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            NameFull: Sharkh, Suleiman M.
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              M: 08
              Text: Aug2015
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