643 research outputs found
Cyber-Resilient Self-Triggered Distributed Control of Networked Microgrids Against Multi-Layer DoS Attacks
Networked microgrids with high penetration of
distributed generators have ubiquitous remote information exchange, which may be exposed to various cyber security threats.
This paper, for the first time, addresses a consensus problem
in terms of frequency synchronisation in networked microgrids
subject to multi-layer denial of service (DoS) attacks, which could
simultaneously affect communication, measurement and control
actuation channels. A unified notion of Persistency-of-Data-Flow
(PoDF) is proposed to characterise the data unavailability in
different information network links, and further quantifies the
multi-layer DoS effects on the hierarchical system. With PoDF,
we provide a sufficient condition of the DoS attacks under
which the consensus can be preserved with the proposed edgebased self-triggered distributed control framework. In addition,
to mitigate the conservativeness of offline design against the
worst-case attack across all agents, an online self-adaptive scheme
of the control parameters is developed to fully utilise the latest
available information of all data transmission channels. Finally,
the effectiveness of the proposed cyber-resilient self-triggered
distributed control is verified by representative case studies
Self-triggered Coordination over a Shared Network under Denial-of-Service
The issue of security has become ever more prevalent in the analysis and
design of cyber-physical systems. In this paper, we analyze a consensus network
in the presence of Denial-of-Service (DoS) attacks, namely attacks that prevent
communication among the network agents. By introducing a notion of
Persistency-of-Communication (PoC), we provide a characterization of DoS
frequency and duration such that consensus is not destroyed. An example is
given to substantiate the analysis
On Resilient Control of Nonlinear Systems under Denial-of-Service
We analyze and design a control strategy for nonlinear systems under
Denial-of-Service attacks. Based on an ISS-Lyapunov function analysis, we
provide a characterization of the maximal percentage of time during which
feedback information can be lost without resulting in the instability of the
system. Motivated by the presence of a digital channel we consider event-based
controllers for which a minimal inter-sampling time is explicitly
characterized.Comment: 7 pages, 1 figur
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