Control of transient power during unintentional islanding of microgrids
Control of transient power during unintentional islanding of microgrids
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-alone mode, 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 setpoints 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.
equations, inverters, mathematical model, microgrids, power generation, reactive power, voltage control
Issa, Walid
539ed2e1-38ee-436c-b7c2-4678fb116f1d
Abusara, Mohammad
4b927b5e-0c68-45bb-8d01-4c22d94ccc7a
Sharkh, S.M.
c8445516-dafe-41c2-b7e8-c21e295e56b9
Issa, Walid
539ed2e1-38ee-436c-b7c2-4678fb116f1d
Abusara, Mohammad
4b927b5e-0c68-45bb-8d01-4c22d94ccc7a
Sharkh, S.M.
c8445516-dafe-41c2-b7e8-c21e295e56b9
Issa, Walid, Abusara, Mohammad and Sharkh, S.M.
(2014)
Control of transient power during unintentional islanding of microgrids.
IEEE Transactions on Power Electronics.
(doi:10.1109/TPEL.2014.2359792).
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-alone mode, 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 setpoints 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.
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e-pub ahead of print date: 23 September 2014
Keywords:
equations, inverters, mathematical model, microgrids, power generation, reactive power, voltage control
Organisations:
Mechatronics
Identifiers
Local EPrints ID: 369904
URI: http://eprints.soton.ac.uk/id/eprint/369904
ISSN: 0885-8993
PURE UUID: 7ee1d1e4-c1c2-4ddc-828c-d7c47e370417
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Date deposited: 14 Oct 2014 08:56
Last modified: 15 Mar 2024 02:48
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Author:
Walid Issa
Author:
Mohammad Abusara
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