Fault-tolerant Control For Networked LPV System

Networked control systems have many advantages,such as public info-resource,less links,easy extendable,easy maintenance,high-reliability and flexibility.But it also brings new problems.On the one hand,due to the communication bandwidth limitations of the Shared network,network congestion,connection interruption,external interference and other reasons,inevitably led to the problem of packet loss and network delay.On the other hand,due to the rapid development of networked control systems,the application of networked linear parameter-varying(LPV)systems has become more widespread.Such as remote wind power generation control system and wireless aircraft system.If these complex systems break down,serious property damage and even casualties can result.Therefore,fault-tolerant control of networked LPV systems has become a hot research topic in control community.This article focuses on the following three parts:The first part is concerned with the observer-based H? control problem of linear parameter-varying systems with global Lipschitz nonlinearities and random communication packet losses.Based on Lyapunov stability theory,sufficient conditions for the existence of an observer-based feedback controller are derived in the presence of random packet losses,such that the closed-loop networked LPV system is exponentially stable in the mean-square sense,and a prescribed H? disturbance-rejection-attenuation performance is also achieved.Then the approximate basis function and the grid technique are used to make the problem of solving an infinite-dimensional linear matrix inequalities be approximated as a finite-dimensional linear matrix inequalities.Then corresponding controller is designed.The second part is concerned with the H? fault-tolerant control problem for linear parameter-varying systems with global Lipschitz nonlinearities,time delay,packet dropouts and actuator faults.A design method of state feedback H? fault-tolerant controller based on Markovian jump linear system is proposed.Based on Lyapunov stability theory and linear matrix inequality methods,sufficient conditions for the existence of the state feedback H? fault-tolerant controller are derived.Then the approximate basis function and the grid technique are used to design such an H? fault-tolerant controller.The third part is concerned with the H? fault-tolerant control problem for linear parameter-varying systems with global Lipschitz nonlinearities,time-varying delay,actuator faults and sensor faults.A design method of state feedback H? fault-tolerant controller is proposed.For solving the time-varying delay in the communication channel,the free-weight matrix method and the Lyapunov-Krasovskii stability theory are used to convert the sufficient condition for the existence of the controller into the solution of the linear inequality.Then the approximate basis function and the grid technique are used to design such an H? fault-tolerant controller.Finally,in order to illustrate the effectiveness of the proposed methods,specific numerical simulations are provided after the corresponding chapters.