A Robust Consensus Algorithm for Current Sharing and Voltage Regulation in DC Microgrids

• Published in: IEEE transactions on control systems technology Vol. 27; no. 4; pp. 1583 - 1595
• Main Authors: Cucuzzella, Michele, Trip, Sebastian, De Persis, Claudio, Cheng, Xiaodong, Ferrara, Antonella, van der Schaft, Arjan
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.07.2019; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Algorithms; Buck converters; Control; Control algorithms; Control systems; Control theory; Current distribution; Current sharing; DC microgrids; Direct current; Distributed generation; Electric potential; Electric power grids; Load modeling; Manifolds; Microgrids; Network topologies; Network topology; Robust control; Robustness; sliding mode (SM) control; Sliding mode control; Steady-state; uncertain systems; Voltage control; voltage regulation
• ISSN: 1063-6536; 1558-0865; 2374-0159; 1558-0865
• DOI: 10.1109/TCST.2018.2834878

In this paper, a novel distributed control algorithm for current sharing and voltage regulation in DC microgrids is proposed. The DC microgrid is composed of several distributed generation units, including buck converters and current loads. The considered model permits an arbitrary network topology and is affected by an unknown load demand and modeling uncertainties. The proposed control strategy exploits a communication network to achieve proportional current sharing using a consensus-like algorithm. Voltage regulation is achieved by constraining the system to a suitable manifold. Two robust control strategies of sliding mode type are developed to reach the desired manifold in a finite time. The proposed control scheme is formally analyzed, proving the achievement of proportional current sharing, while guaranteeing that the weighted average voltage of the microgrid is identical to the weighted average of the voltage references.