Analysis And Design Of Network Control System Based On Event Trigger Under Network Attack

Networked control system is the product of mutual integration and penetration of control system,computer technology and communication network.Due to the limited network bandwidth resources and the frequent occurrence of network attack events,it is an important issue to effectively utilize network resources and improve system security under the premise of ensuring system control performance.In this paper,in the network control system based on event triggering mechanism under network attack,the controller design and stability analysis are carried out in the aspects of control reliability,security and so on.The research contents of this paper are as follows:(1)For a class of networked control systems with reference system,an adaptive elastic synchronous control strategy is designed to ensure the stable and synchronous operation of the system under the condition of link attack and spoofing attack.Link attacks occur in the communication link between the network control system and the reference system,which changes the weight of the system communication.Spoofing attacks occur on actuators and are represented by changes in control inputs.Firstly,an adaptive state observer is designed to reconstruct the state of the reference system.Secondly,by designing a state predictor to compensate the control signals,the conditions for stable operation of the system under attack can be obtained.(2)Aiming at a class of networked control systems attacked by sensors and actuators,an adaptive compensation scheme based on dynamic event triggering mechanism is designed to ensure the stable operation of the system under attack.A compensation control protocol is designed to compensate the attacked sensors and actuators.In order to save bandwidth limit and improve resource utilization,a dynamic event trigger is formed by introducing an internal dynamic variable.Finally,the parameters of the controller and the trigger conditions of the dynamic events are obtained by using the Lyapunov stability theory.(3)For a class of linear multi-agent systems with leaders,an adaptive elastic synchronous control strategy is designed based on event triggering mechanism to ensure that the follower state can converge to the leader state.Firstly,a fully distributed and extensible adaptive leader state observer is designed within each follower,which can be observed only through neighbor information without any global information.At the same time,in order to avoid the unnecessary communication between agents,an adaptive leader state observer based on event trigger is designed.The dynamic variables related to the system are introduced into the trigger function to form the dynamic event trigger and eliminate the promise phenomenon.Finally,the local controller is designed to realize the tracking and synchronization control of the local agent.