Stability Analysis And Controller Design Of Networked Cascade Control Systems

Recently,due to the rapid development of network communication and control technology,the issues of NCS pay closer attention and researchers get a lot of achievement about control systems.NCCSs are kinds of special NCSs,which are widely concerned by many scholars and much remarkable research results can be obtained.The results not only have theoretical significance,but also provide practical significance for practical application.Owing to limited Internet resource and the properties of Internet,such as network-induced delay,data packet dropout,packet disorder,may bring unstable systems.It is of great significance to study NCCSs.According to the difference of the controller plants through network,NCCSs are divided into linear-continuous NCCSs?linear-discrete NCCSs and nonlinear NCCSs.A system model is given and the corresponding controller is designed.In this paper,compared to the existing method of designing controller by experience,it is the first time to design the optimal solution of the main controller and secondary controller,which can provide reference for industrial application.The specific research is as follows:1.Considering the advantages of the event-triggered scheme to save bandwidth resource,and network-worked cascade control system in the industrial production is widespread.It is the first time to introduce the event-triggered scheme into the linear-continuous NCCSs and linear-discrete NCCSs.Then a new model is constructed,the sufficient conditions of stability and the trigger condition are obtained.At the same time,the corresponding main and secondary controllers are designed,and the feasibility of this method is illustrated by simulation.2.Considering a class of nonlinear systems called Lurie system,it is of great practical significance to consider it in the controlled object of nonlinear networked cascade control system.It is the first time to put the Lurie control into the nonlinear NCCSs.Then a new model is established,and the sufficient conditions of stability and the trigger condition are obtained.At the same time,we get the corresponding main controller and secondary controller,and a simulation is proved to know the feasibility of this method.