Research On Network Security And Optimization Of Control System Based On Game Theory

The control system has developed from single system to multi-agent system,from continuous system to discrete system,from discrete system to continuous system.The rapid development of information technology not only brings us more and more convenience,but also makes the system more and more complex.It reduces the reliability,anti-interference and security of the system,and increases the energy consumption,equipment overhead and maintenance cost of the system.Therefore,the research on the security and optimization of control system has profound significance.It can not only solve the security hidden dangers brought by computer network,but also conform to the era theme of low energy consumption and green environmental protections.The main research results are as follows:Firstly,the security control of wireless network system is studied under jamming attack.Taking interference attack into communication network,game theory is applied to describe the non-cooperative relationship between users and jamming attack.Due to the existence of Nash equilibrium strategy,the final packet loss rate is obtained,and the variable sampling method is utilized to deal with the packet loss in the data transmission process.Iterative dynamic programming algorithm is used to design the optimal controller.The relevant sufficient conditions are given for the stability of the system.Secondly,the multi-agent system suffering from state saturation is considered.To avoid the congestion caused by limited network resources and information transmission between multi-agents,network protocol is exploited to coordinate data transmission between multi-agents.Faced to gain disturbance and state saturation,a near-optimal controller is designed to achieve the multi-agent coordinated control.To ensure that each unit coordinates with the operation.the stability of the system in the infinite time domain is analyzed.Finally,the multi-task control of the non-linear system is studied.The non-linear system is transformed into a linear time-varying control system.Game theory is used to describe the restrictive relationship between multi-tasks.Each input must achieve its ownobjective,and then a Nash equilibrium solution is obtained to ensure its performance.At the same time,the Lipschitz condition is provided to determine the existence and uniqueness of the solution of the differential Riccati equation,and the optimal controller is designed under the gain perturbation.