Control of Transient Power During Unintentional Islanding of Microgrids


In inverter-based mostly microgrids, the paralleled inverters want to figure in grid-connected mode and stand-alone mode and to transfer seamlessly between the 2 modes. In grid-connected mode, the inverters management the quantity of power injected into the grid. In stand-alone mode, however, the inverters management the island voltage while the output power is dictated by the load. This can be achieved using the droop control. Inverters will have different power set points during grid-connected mode, however in stand-alone mode, all of them need their power set points to be adjusted consistent with their power ratings. But, throughout sudden unintentional islanding (because of 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 inflicting them to clean up. 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 facility set purpose in proportion to the rise in the voltage. A small-signal model of an islanded microgrid is developed and used to style the controller. Simulation and experimental results are presented to validate the planning.

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