A Novel Robust Hierarchical Consensus Algorithm with Application in DC Nanogrids Coordination

Document Type : Research Paper

Authors
Ahmadreza Ghaznavi
SMT Almodarresi
Faculty of Electrical Engineering, Yazd University, Yazd, Iran
10.22075/ijnaa.2019.4178
Abstract
This research investigates the delay sensitivity of discrete-time consensus among agents which communicate over a scale-free network with hubs. In this paper, a novel hierarchical consensus algorithm, based on the idea of virtual communication graph degree reduction, is proposed. As a result, a significant consensus speed gain is obtained which provides a potential time margin for applying cyber-physical techniques that cause systematic input delay. This approach provides robustness and resiliency in case of any communication topology disturbance during cyber- physical attacks or plug-and-play events. The feasibility of plug- and-play, which has the potential to increase the input delay, is presented based on the gained margin as a sample scenario. The algorithm application in the coordination of distributed photovoltaic resources of several nano-grids communicating over a scale-free network, is assessed via simulation as well.
Keywords
Discrete-time consensus
delay
DC nano-grid
hierarchical control
multi-agent system
network with hub
plug- and-play
robust/resilient consensus
scale-free network
International Journal of Nonlinear Analysis and Applications
Volume 10, Issue 2
December 2019
Pages 97-110

  • Receive Date 15 December 2017
  • Revise Date 01 November 2018
  • Accept Date 25 September 2019

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