Abstract
Networked control systems (NCSs) are designed to control and monitor large-scale and complex systems remotely. The communication connectivity in an NCS allows agents to quickly communicate with each other to respond to abrupt changes in the system quickly, thus reducing complexity and increasing efficiency. Despite all these advantages, NCSs are vulnerable to cyberattacks. Injecting cyberattacks, such as a time-delay switch (TDS) attack, into communication channels has the potential to make NCSs inefficient or even unstable. This paper presents a Lyapunov-based approach to detecting and estimating TDS attacks in real time. A secure control strategy is designed to mitigate the effects of TDS attacks in real time. The stability of the secure control system is investigated using the Lyapunov theory. The proposed TDS attack estimator’s performance and secure control strategy are evaluated in simulations and a hardware-in-the-loop environment.
Highlights
A networked control system (NCS) is a type of control system in which the control and feedback data packets are exchanged through communication channels between agents and the controller
The load frequency control (LFC) model was implemented via MATLAB Simulink 2019a, and it was converted into a C program to be loaded into the Dspace board
This paper presented an approach to providing adjustments to the input signal in an NCS structure in order to keep a plant working properly, even under a time-delay switch (TDS) attack
Summary
A networked control system (NCS) is a type of control system in which the control and feedback data packets are exchanged through communication channels between agents and the controller. Leveraging communication channels in an NCS can control and supervise the system more efficiently and reliably, NCSs are prone to cyber disruptions—either inherent or intentional ones, such as cyberattacks. The number and intensity of these cyber manipulations have grown in recent years One of these cyber attacks was the 2015 Ukraine Blackout event, in which about 225,000 customers lost their electricity for several hours. This cyber incident was a successful FDI on an actual power grid [8]. The 2019 Venezuela blackout resulted from a cyberattack on energy supplies in eighteen states that affected two-thirds of the country [9,10] These cyber disruptions determine the criticality of studying cyber attacks on NCSs, like power grids
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