Asynchronous Periodic Distributed Event-Triggered Frequency Control of Microgrids

TL;DR

This paper presents a novel asynchronous event-triggered frequency control scheme for islanded microgrids that reduces communication and computation by allowing DGs to operate on their own clocks without synchronization.

Contribution

It introduces an asynchronous, sampled-data based event-triggered control method that does not require DGs to synchronize clocks, improving efficiency over existing strategies.

Findings

All DGs' frequencies converge to the reference frequency.

The method reduces communication and computation complexity.

Effectiveness verified through MATLAB/Simulink simulations.

Abstract

In this paper, we introduce a distributed secondary frequency control scheme for an islanded ac microgrid under event-triggered communication. An integral type event-triggered mechanism is proposed by which each distributed generator (DG) asynchronously and periodically checks its triggering condition and determines whether to update its control inputs and broadcast its states to neighboring DGs. In contrast to existing event-triggered strategies on secondary control of microgrids, under the proposed sampled-data based event-triggered mechanism, DGs need not be synchronized to a common clock and each individual DG checks its triggering condition periodically, relying on its own clock. Furthermore, the proposed method efficiently reduces communication and computation complexity. We provide sufficient conditions under which all DGs' frequencies asymptotically converge to the common reference frequency value. Finally, effectiveness of our proposed method is verified by simulating different scenarios on a well-established islanded ac microgrid benchmark in the MATLAB/Simulink environment.