| Switched system provides an effective method for modeling and control of complex systems,and its related content has become a research hotspot in the field of control.In recent years,switched systems have been widely used in power system,intelligent transportation system,industrial automation system and space vehicle.In current studies,the stability analysis and controller design of switched systems are mostly based on dwell time or state-feedback method,which will cause unnecessary switching and control.The event-triggered control method can reduce the frequency of communication and control,thus saving communication and computing resources.In view of this,for a class of switched linear systems with unstable subsystems,this thesis focuses on the design of event-triggered switching signals and controllers to ensure asymptotic stability of switched systems,while taking into account switching cost and bumpless transfer performance.The main research contents are as follows:Firstly,the stability of event-triggered switched systems without control input is studied.For a class of switched systems with unstable subsystems,in order to reduce unnecessary switching,state-type and error-type event-triggered mechanisms are designed respectively,and the asymptotic stability conditions of switched systems are established by using multiple Lyapunov function method.In addition,the event interval parameter is introduced to eliminate Zeno phenomenon,and simulation results show that the design of event-triggered switching can reduce the number of switching.Secondly,the control synthesis problem of event-triggered switched systems with control input is studied.A new event-triggered switching mechanism including event interval parameters is designed by combining the event-triggered switching signals with state-dependent switching signals.Then,the stability of the closed-loop system is analyzed by using the multiple Lyapunov function method,and the solving conditions of the event-triggered weight matrix and controller gain are obtained.Simulation results show that the proposed method is effective in reducing the switching and control frequency.Finally,the synthesis of event-triggered switching control with bumpless transfer for switched systems is studied.In order to obtain better switching transient performance and reduce the discontinuity of control input at switching instant,a bumpless transfer constraint is proposed.A series of asymptotic stability conditions for the control system are established by means of multiple Lyapunov function,and the effectiveness of the method is verified by simulation. |
