Event-Triggered Control Under DoS Attacks With Application To DC Microgrids

Recent years have witnessed the developments of cyber-physical systems(CPSs)due to the progress of computing,communication network,and related hardware technologies.CPS is an integration of physical processes,ubiquitous computation,efficient communication and effective control.This article reviews the current research status of network attack schemes and defense strategies in industrial CPSs from the perspective of control theory,and proposes several issues to be studied from the aspects of system modeling,performance requirements,attack types,and security control.Firstly,the design of dynamic event-triggered controller under DoS jamming attacks is studied.In the case of DoS attacks,a dynamic event triggering control method is proposed.Then Lyapunov control theory is used to obtain LMIs that make the system asymptotically stable.Based on solving these linear matrix inequalities,the controller parameters and event-triggered conditions are designed.Finally,the correctness and effectiveness of the theory are illustrated by simulation examples.Then,the DC microgrid is introduced into the typical CPS smart grid,and the design of eventtriggered controller of DC microgrids under DoS jamming attacks is studied.First of all,an event triggering control scheme is designed to invoke the data transmission over the communication line only when the DoS attack is inactive.Second,by characterizing the DoS active and inactive time intervals,a new switching piecewise system model for the nonlinear DC microgrids system is proposed.Third,a numerically efficient design criterion on the existence of the desired eventtriggered controller is established.It is further shown that various performance indices can be evaluated in a unified framework.Finally,an example is given to verify the effectiveness of the proposed method.Finally,the design of dynamic event-triggered controller of DC microgrids under DoS jamming attacks is studied.In order to further reduce the redundant data transmission in the grid,the dynamic event triggering mechanism is introduced into the DC microgrids,and the impact of DoS attack on the system stability is considered.Using the time-delay method,the model of networked switched system is established.By employing the piecewise Lyapunov-Krasovskii functional approach and linear matrix inequality techniques,the asymptotic stability of the system is guaranteed.In addition,it is proved that the proposed dynamic event triggering method can further save communication resources than the event triggering method.Finally,a simulation example is given to demonstrate the effectiveness of the proposed dynamic event-triggered controller for DC microgrids.