Research On Predictive Control Of Networked Control Systems Based On Event-triggered

In network control systems,how to take reasonable control algorithm and scheduling strategy can determine whether the conflicts and congestion will occur in a large part,and then the network induced delay and packet loss caused by network induced factors of the system will be reduced.It can improve the performance of networked control systems effectively.In recent years,event-triggered communication scheme has attracted more and more attention,because it can improve the utilization of network resources obviously.But this scheme is at the expense of certain control performance.The predictive control algorithm can improve the control quality of the system to a certain extent.Therefore,it is meaningful to joint study the two sides.This thesis mainly includes the following contents:Firstly,a brief overview of definition,structure and basic problems of network control systems is provided.Then,the discrete event-triggered scheme is introduced.The research status of predictive control is reviewed briefly.The main theories and lemmas of this thesis are given.Secondly,the networked control system based on event-triggered scheme with time delay is analyzed and studied.A delay mathematical model based on discrete event-triggered scheme is established.By using the theory of Lyapunov-Krasovskii functional and linear matrix inequality approach,the delay-dependent stability of network control system is analyzed,and the controller is designed.A numerical example shows the correctness of this conclusion.Finally,considering the linear discrete-time networked control system with packet loss,a novel predictive control scheme based on event-triggered is proposed.It combines event-triggered communication scheme with predictive control.The communication channel pressure is reduced through the event-triggered scheme,and at the same time network bandwidth resource is saved.This will reduce the quality of the control system to some extent.The predictive control algorithm can compensate it actively.Compromising the two factors,the system can get the ideal control performance by compensating the packet loss,and at the same time the utilization of network bandwidth resources has been improved.The mathematical model is established combining with the above two aspects.Based on this model,the stability of closed loop control system is analyzed respectively by using the theory of Lyapunov-Krasovskii functional and linear matrix inequality approach.The scheme is extended to the stability of discrete-time linear systems with network-induced delay.