Optimal Decentralized Economical-sharing Scheme in Islanded AC Microgrids with Cascaded Inverters

TL;DR

This paper introduces a decentralized scheme for economical power sharing in islanded AC microgrids with cascaded inverters, utilizing frequency synchronization and current-based reference voltages to improve efficiency without communication.

Contribution

It proposes a novel decentralized control method using frequency and current sharing for microgrids with cascaded inverters, verified through simulations and experiments.

Findings

Effective decentralized power sharing achieved

Microgrid maintains synchronized frequency and current

Scheme verified by simulations and experiments

Abstract

To address the economical dispatch problem without communications in islanded AC microgrids consisting of cascaded inverters, this paper proposes an optimal decentralized economical-sharing scheme. In proposed scheme, optimal sharing function of the current is applied to generate the reference voltages. And the frequency is used to drive all distributed generators (DGs) synchronize operation in microgrids. When the microgrid is in steady state, DGs share a single common frequency and current in terms of the proposed scheme. Thus the potential advantages of simplicity and decentralized manner are retained. The AC microgrid model has been developed through simulations and experiments to verify the effectiveness and performance of the proposed scheme.