The paper considers the problem of detecting
cyber-attacks occurring in communication networks typically
used in the secondary control layer of DC microgrids. The proposed
distributed methodology allows for scalable monitoring of
a microgrid and is able to detect the presence of data injection
attacks in the communications among Distributed Generation
Units (DGUs) - governed by consensus-based control - and
isolate the communication link over which the attack is injected.
Each local attack detector requires limited knowledge regarding
the dynamics of its neighbors. Detectability properties of the
method are analyzed, as well as a class of undetectable attacks.
Some results from numerical simulation are presented to
demonstrate the effectiveness of the proposed approach.
