Optimal Decentralized Economical-sharing Criterion and Scheme for Microgrid

TL;DR

This paper introduces an optimal decentralized criterion and schemes for economic dispatch in islanded microgrids, enabling cost-effective power sharing without communication, with methods for both optimal and suboptimal solutions.

Contribution

It proposes a novel decentralized criterion to determine if global optimal dispatch is achievable and develops corresponding schemes, including a modified method for suboptimal cases.

Findings

Decentralized schemes are effective and communication-less.

The criterion distinguishes when optimal or suboptimal dispatch is feasible.

Proposed methods improve microgrid economic dispatch efficiency.

Abstract

In order to address the economical dispatch problem in islanded microgrid, this letter proposes an optimal criterion and two decentralized economical-sharing schemes. The criterion is to judge whether global optimal economical-sharing can be realized via a decentralized manner. On the one hand, if the system cost functions meet this criterion, the corresponding decentralized droop method is proposed to achieve the global optimal dispatch. Otherwise, if the system does not meet this criterion, a modified method to achieve suboptimal dispatch is presented. The advantages of these methods are convenient,effective and communication-less.