Control Research Of Several Kinds Of Saturated Switched Systems

Switched system is a special type of hybrid system,which can be widely used as a model in system control and computer science.A key problem in the study of switched system is the system stability analysis.However,in practical engineering applications,the control system stability is difficult to be guaranteed due to the influence of actuator saturation and state saturation.In addition,in order to adapt to the practical system control,how to make the control system to achieve the expected performance in finite time on the basis of saving resources and ensuring the system robustness has become a research focus.Therefore,the study on the robust control,finite time control and event-triggered control of saturated switched system has important theoretical research significance and practical application value.This thesis studies the control of several kinds of saturated switched systems.The main content of this thesis includes the following parts:The first part is the introduction,which mainly introduces the background,significance and research status of the switched systems,actuator saturation,state saturation and event-triggered mechanism.In the second part,a class of robust H?control is studied for the switched systems with the actuator saturation,mismatched uncertainty and external disturbance.Firstly,based on the average dwell time and the linear matrix inequality methods,a low gain state feedback controller is designed to ensure that the closed-loop system is exponentially stable and satisfies the H?control performance.Then,when the switched system state is not completely measurable,a H?controller based on the observer is designed.In the third part,the event-triggered finite-time H?control is investigated for a class of continuous time switched systems with the state saturation,time delay and nonlinearity.Firstly,in order to eliminate Zeno behavior,a positive minimum lower bound of adjacent triggering intervals is obtained.Secondly,based on the average dwell time and the linear matrix inequality methods,an event-triggered finite-time H?controller is designed to ensure that the closed-loop system is finite-time stable.In the fourth part,the event-triggered passive control is investigated for a class of discretetime switched systems with the state saturation,actuator saturation,nonlinearity and external disturbances.Firstly,based on the event-triggered mechanism,the exponentially stability analysis and passive analysis of the closed-loop system are carried out by the average dwell time and the linear matrix inequality methods.Then,the event-triggered passive controller is designed and can be computed by solving the linear matrix inequlities.The fifth part is the summary and prospect,which summarizes the main results of this thesis and makes a further prospect to the future research work.