Event-triggered active disturbance rejection control for nonlinear network control systems subject to DoS and physical attacks

This paper investigates the problem of event-triggered active disturbance rejection control of nonlinear network control system in simultaneous presence of unknown dynamics, physical attacks and denial-of-service attacks. Considering the network congestion, an event-triggered communication mechanism is adopted, where the measurements are transmitted only when an 'event' occurs. An indicator obeying the Markov jump rule is introduced to characterize the randomly occurring denial-of-service attacks. In virtue of the extended state observer (ESO), the states and the total disturbance which involves both unknown dynamics and physical attacks are estimated. Then, the composite controller is designed which could stabilize the overall controlled system and eliminate the so-called total disturbance. Sufficient conditions are established to guarantee the stability of the observer system and overall controlled system. The cone-complementarity linearization algorithm is adopted to obtain the parameters of the extended state observer and the controller. Finally, both numerical and application design examples demonstrate the feasibility and efficacy of the proposed method. Simulation results show that the steady-state error within 0.02 can be achieved within 3 s.