Research On Security Control Of Networked Interconnected Systems Under Resource Limitation

In real life,the structure of power system,digital communication system,space system and other systems is becoming more and more complex and correlated.These systems are usually composed of coupled and interconnected subsystems distributed in large regions,that is,interconnected systems.Due to the limitation of the network bandwidth,the communication of the network interconnected system is often limited to some extent,so how to relieve the network bandwidth pressure has become an urgent problem to be solved.The network environment is full of uncertainty,and the interconnected system may suffer from different types of network attacks.How to deal with the impact of network attacks on the system is also very important,which is worth our in-depth discussion.Considering the above mentioned problems,this paper mainly studies the stability and controller design of the network interconnected system under the hybrid cyber attacks.The main contents of this article are as follows:1.This dissertation studies the design of security adaptive event-triggering controller of network interconnected system with hybrid network attacks.First,an adaptive event-triggering mechanism is adopted to save the limited network bandwidth by dynamically adjusting the threshold.Considering the effects of replay and deception attacks,we model a new control input for networked interconnected systems.A mathematical model of a new networked interconnected system based on hybrid network attack and adaptive event triggering mechanism.According to the closed-loop system model,Lyapunov stability theory and linear matrix inequality(LMI)method obtain the asymptotic stability and the design algorithm is presented.Finally,a simulation example to demonstrate the validity of the theoretical results.2.Based on the adaptive event-triggering mechanism,this dissertation discusses the output feedback security control problems of network interconnected systems that contain deception attacks and denial-of-service(DoS)attacks.The emphasis is on designing a scheme that takes into account both the adaptive event-triggering mechanism and the decentralized output feedback control,so that the network interconnected system subjected to hybrid cyber attacks can operate stably.Considering the influence of hybrid network attacks,a model of network interconnected system based on adaptive event-triggering mechanism is developed.Using the LMI method and the Lyapunov stability theory,we obtain sufficient conditions for the exponential mean square stability of the closed-loop system.Through a simulation example,the proposed output feedback control algorithm is effective and can ensure the stable operation of the system.