Research On Co-Design Of Networked Control System Based On Event-Triggered Scheme

In recent years, with the rapid development of computer technology and communication technology, the scale of control systems are getting huger, and the decentralization levels are getting higher. Traditional control method cannot meet complex project systems, which is in need of control system structure. It is the developing of technology and improving demand of control that promote progress of the Networked Control System(NCS). However, the communication network used in the control system brings great convenience as long as huge challenges to the analysis and design of control systems. In order to meet the real-time requirements of the control systems, reduce unnecessary waste of network bandwidth resources,the research of event-triggered scheme for networked control system received more and more scholars’ attentions. The event-triggered communication scheme effectively reduces the date transfer volume, which makes the computational complexity of controller and the executions of actuator decrease. This thesis studies system modeling, stability analysis and controller design problems for Networked Control System based on event-triggered scheme to realize co-design of control and communication to guarantee the Quality of Performance and the Quality of Service.This thesis mainly includes the following contents:Firstly, a brief overview of definition, structure, basic problems and research content of network control systems is provided. Some research results and latest progresses of event-triggered scheme in recent years are enumerated, and the current four event-triggered communication schemes are simply introduced. The main lemma of this thesis are given.Secondly, the time delay system model for networked control system based on 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 systems are analyzed, and the controller are designed. A numerical example shows the correctness of this conclusion.Thirdly, the event-triggered output-feedback control problem is studied for uncertain networked control system. Considering the full state information of control system cannot be measured, in practice, output feedback control system model with dynamic compensation function and observer-based state feedback control system model are established respectively. Based on these models, the stability of two closed loop control systems are analyzed respectively using the theory ofLyapunov-Krasovskii functional and linear matrix inequality approach. Numerical examples are given to demonstrate the effectiveness of the proposed method.Finally, the idea of co-design for networked control system based on event-triggered scheme is introduced through comprehensively considering the influence of event-triggered condition, which is caused by control system performance parameters and communication network dynamic characteristics in networked control system. A novel event-triggered condition is presented by analyzing the model of control systems and congestion control of communication network. By applying the theory of Lyapunov-Krasovskii functional and linear matrix inequality approach, the H?performance of network control systems are analyzed, and the H?controller are designed. The results of simulation data verify the validity of the proposed method.