The Problem Of Control And Filtering For Networked Control System Based On Hybrid Trigged Scheme Under Complex Network Attacks

The current development of 5G and other communication technologies has promoted the application of networked control systems in many fields such as smart cities and smart grids.The introduction of the network allows the control system to have lower operating costs,convenient maintenance and operation,and more scalable functions.However,the complexity and openness of the network environment also make data transmission face the threat of network attacks such as DOS attacks,deception attacks,replay attacks.The current research on network attacks is still limited to a single attack.However,attackers can launch complex attacks that include multiple network attacks through different combinations.Therefore,it is of great significance to study the impact of complex network attacks on data transmission.The current development of network communication has increased the speed of data transmission,but the network bandwidth is still limited.,and the limited bandwidth will cause system information collection and data transmission problems such as time delay and loss.The traditional time-triggered scheme has more than enough capacity to deal with the data transmission in the current complex environment.This paper introduces the hybridtriggered scheme into the networked control system to reduce data transmission,save bandwidth resources,and improve data collection efficiency.Considering the influence of complex network attacks and hybrid-triggered scheme on system data transmission,the design of controller and distributed filter of networked control system is studied.The main research contents are as follows:Considering the influence of hybrid-triggered schemem and hybrid network attack on data transmission,the controller design of the networked control system is studied.This chapter introduces a hybrid-triggered scheme,a variable meeting Bernoulli distribution is used to switch the time-triggered scheme and the event-triggered scheme,the data transmission in the communication network is released,and the pressure of the limited network bandwidth is relieved.Under the influence of DOS attacks and deception attacks,a hybrid attack model is build based on networked control systems.Combining the hybrid-triggered scheme and the constructed hybrid attack model,a controller model for networked control systems is constructed for the first time.Based on the established system model,the sufficiency conditions for system stability and the accurate system controller gain matrix are obtained.Finally,an example is used to verify the effectiveness of the design scheme.Considering the influence of complex network attacks on the networked control system,the distributed filter design is studied based on the hybrid-triggered schemem.The combination of the hybrid-triggered schemem and the distributed sensors can reduce the redundant information transmitted by the sensors and improve the quality of the transmitted data.The impact of DOS attacks and replay attacks on distributed systems is considered.These two types of attacks are represented by two variables satisfying the Bernoulli distribution to represent the randomness of their occurrence,and a complex network attack model is constructed.Based on the influence of distributed sensors combined with hybrid-triggered scheme and network attacks on system data transmission,the mathematical model of distributed filter for networked control system was established for the first time.On the basis of the established system model,the sufficient conditions for system stability and the design parameters of the distributed filter are obtained.Finally,an example is used to verify the effectiveness of the distributed filter designed.