Plug-and-play voltage and frequency control of islanded microgrids with meshed topology
For microgrid operators, this work provides a practical decentralized control method that simplifies plug-and-play integration of distributed generation units.
This paper proposes a decentralized control scheme for islanded microgrids that ensures stability and enables plug-and-play operations, where only physically connected DGUs retune when a unit is added or removed. Simulations using IEEE standard performance indexes validate the approach.
In this paper we propose a new decentralized control scheme for Islanded microGrids (ImGs) composed by the interconnection of Distributed Generation Units (DGUs). Local controllers regulate voltage and frequency at the Point of Common Coupling (PCC) of each DGU and they are able to guarantee stability of the overall ImG. The control design procedure is decentralized, since, besides two global scalar quantities, the synthesis of a local controller uses only information on the corresponding DGU and lines connected to it. Most important, our design procedure enables Plug-and-Play (PnP) operations: when a DGU is plugged in or out, only DGUs physically connected to it have to retune their local controllers. We study the performance of the proposed controllers simulating different scenarios in MatLab/Simulink and using performance indexes proposed in IEEE standards.