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This paper presents a two-layer, four-level distributed control method fornetworked microgrid (NMG) systems, taking into account the proprietary natureof microgrid (MG) owners. The proposed control architecture consists of aMG-control layer and a NMG-control layer. In the MG layer, the primary anddistrib-uted secondary control realize accurate power sharing among distributedgenerators (DGs) and the frequency/voltage reference following within each MG.In the NMG layer, the tertiary control enables regulation of the power flowingthrough the point of common coupling (PCC) of each MG in a decentralizedmanner. Furthermore, the distributed quaternary control restores systemfrequency and critical bus voltage to their nominal values and ensures accuratepower sharing among MGs. A small-signal dynamic model is developed to evaluatedynamic performance of NMG systems with the proposed control method.Time-domain simulations as well as experiments on NMG test systems areperformed to validate the effectiveness of the proposed method.

A Two-Layer Distributed Control Method for Islanded Networked Microgrid Systems