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Asynchronous Periodic Distributed Event-Triggered Frequency Control of Microgrids

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Document pages: 8 pages

Abstract: In this paper, we introduce a distributed secondary frequency control schemefor an islanded ac microgrid under event-triggered communication. An integraltype event-triggered mechanism is proposed by which each distributed generator(DG) asynchronously and periodically checks its triggering condition anddetermines whether to update its control inputs and broadcast its states toneighboring DGs. In contrast to existing event-triggered strategies onsecondary control of microgrids, under the proposed sampled-data basedevent-triggered mechanism, DGs need not be synchronized to a common clock andeach individual DG checks its triggering condition periodically, relying on itsown clock. Furthermore, the proposed method efficiently reduces communicationand computation complexity. We provide sufficient conditions under which allDGs frequencies asymptotically converge to the common reference frequencyvalue. Finally, effectiveness of our proposed method is verified by simulatingdifferent scenarios on a well-established islanded ac microgrid benchmark inthe MATLAB Simulink environment.

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