Passivity-based economic ports for optimal operation of networked DC microgrids

TL;DR

This paper introduces economic ports for modular control of networked microgrids, enabling distributed optimal operation and stability through passivity-based interconnections.

Contribution

It proposes a novel framework of economic ports and a price-based controller for stable, optimal microgrid operation and interconnection.

Findings

Ensures asymptotic stability of microgrid networks.

Achieves global economic optimality at steady state.

Demonstrates effectiveness through academic examples.

Abstract

In this paper, we introduce the novel concept of economic ports, allowing modular and distributed optimal operation of networked microgrids. Firstly, we design a novel price-based controller for optimal operation of a single microgrid and show asymptotic stability. Secondly, we define novel physical and economic interconnection ports for the microgrid and study the dissipativity properties of these ports. Lastly, we propose an interconnection scheme for microgrids via the economic ports. This interconnection scheme requires only an exchange of the local prices and allows a globally economic optimal operation of networked microgrids at steady state, while guaranteeing asymptotic stability of the networked microgrids via the passivity properties of economic ports. The methods are demonstrated through various academic examples.