Plug-and-play voltage and frequency control of islanded microgrids with meshed topology

TL;DR

This paper introduces a decentralized, plug-and-play control scheme for islanded microgrids with meshed topology, ensuring stability and ease of reconfiguration through local controllers that require minimal global information.

Contribution

It presents a novel decentralized control design that guarantees stability and allows plug-and-play operation in islanded microgrids with meshed topology.

Findings

Controllers maintain stability in various scenarios

Plug-and-play operation requires only local retuning

Performance aligns with IEEE standards

Abstract

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.