In this work, linear (linearized) cyber-physical systems with output feedback control,
whose sensors are experiencing faults or are under cyber-attack, are studied. Two
different cases are investigated. First, when all sensors are attacked, then, when some
sensors are protected from the attacks. Finite time convergent observers, ...
In this work, linear (linearized) cyber-physical systems with output feedback control,
whose sensors are experiencing faults or are under cyber-attack, are studied. Two
different cases are investigated. First, when all sensors are attacked, then, when some
sensors are protected from the attacks. Finite time convergent observers, specifically
the sliding mode ones, including the observers with gain adaptation, are employed for
on-line reconstruction of the cyber-attacks. The corrupted measured outputs are
“cleaned” from cyber-attacks, and feedback control that uses the “cleaned” outputs is
shown to provide elevated cyber-physical system performance close to the one
without attack. Finally, the proposed methodology is applied to an electric power
system under cyber-attack. Simulation results illustrate the efficacy of the proposed
observers.