On modeling and secure control of cyber‐physical systems with attacks/faults changing system dynamics: An average dwell‐time approach

Abstract

Summary The problem of secure control in cyber‐physical systems is considered in this work. A new modeling framework is first introduced, ie, cyber‐physical systems with attacks/faults changing system dynamics is modeled as a switched system, where the switching among subsystems is triggered by a rule generated by attackers but unknown for defenders. Based on an average dwell‐time approach incorporated by the attack frequency and duration properties, a convergence condition of the Lyapunov function on active intervals of subsystems (ie, the attack and healthy modes), under the developed switched controller, is given. Next, the unknown rule, however, leads to the asynchronous switching problem between the candidate controllers and system modes. As a result, degradation of the system performance (eg, a large chatter occurred in the system state trajectories) in the asynchronous intervals is caused. To address the difficulty, a novel switching law based on a prescribed performance is proposed, and it is shown that the asynchronous intervals are shortened by reducing adjustable parameters in the switching law. An illustrative example verifies the effectiveness of the proposed method.

Observer‐based security control for distributed cyber‐physical systems under replay attacks

“…It should be pointed out that, despite the security control problem for distributed CPSs is now attracting considerable research attention, 10,[25][26][27] several challenges still remain. First, many existing results assume that the state information of CPSs is fully available.…”

Nonfragile security control for time‐varying cyber‐physical systems operating over multipath networks

“…It formulated a Markov game framework to represent the interactive decision-making process, taking into account the present state and information collected from prior time steps. Besides, the relevant research has acknowledged the existence of other studies 6,7 addressing the topic of CPSs under DoS attacks.…”