Event-Triggered Control And Filtering For The Two-Time-Scale CPSs Under Denial-of-Service Attacks

The two-time-scale Cyber-Physical Systems(CPSs)are CPSs with coupling fastchanging dynamics and slow-changing dynamics.they have been extensively used in physical systems,such as intelligent mine,smart grids,and aerospace.Nonetheless,illconditioned numerical problems would raise from the direct use of the existing conventional designs of the two-time-scale CPSs under unknown period Denial-ofService(DoS)attacks.Therefore,focusing on the two-time-scale CPSs under unknown period DoS attacks,this thesis studies the methods for control and filtering based on the event-triggered mechanism.The aim is to overcome ill-conditioned numerical problems of the conventional CPSs and to achieve control and estimation of the twotime-scale CPSs under unknown period DoS attacks.The major content of this thesis can be concluded as follows:1.The two-time-scale switched filter based on the event-triggered mechanism is proposed for the state estimation problem of the two-time-scale CPSs under unknown period DoS attacks.Firstly,a resilient event-triggered mechanism is designed to save the network resources and eliminate the impact of DoS attacks.Secondly,based on this event triggering mechanism,the two-time-scale CPSs switched filter design method is proposed,and the filtering error switched system is established.Then,by constructing a Lyapunov function dependent on time scale parameter,sufficient conditions are obtained for the existence of switched filter such that for any less than or equal to the predefined upper bound,the filtering error switched system is exponentially stable and meets the performance under unknown period DoS attack.Finally,simulation examples are proposed to verify the effectiveness of the obtained method.2.A switched controller based on bias adaptive dynamic event-triggered is proposed for the two-time-scale CPSs under unknown period DoS attack.Firstly,by combining the characteristics of the static event-triggered mechanism and traditional dynamic event-triggered mechanism,a bias adaptive dynamic event-triggered mechanism with consideration of the presence of DoS attacks is designed by using system dynamic deviation.Then,by constructing a Lyapunov function dependent on time scale parameters,a switched controller design method for the two-time-scale CPSs is proposed and the stability of switched control system under unknown period DoS attacks is analyzed.Finally,the effectiveness of the proposed switched controllers based on bias adaptive dynamic event-triggered mechanism is testified by simulation examples.3.Based on the design method of bias adaptive dynamic event-triggered switched controller proposed above,the controller is designed to address the tracking control problem of permanent-magnet synchronous motors under unknown period DoS attack.Firstly,the permanent-magnet synchronous motors are modeled as two-time-scale systems;then,with the help of the controller design method proposed above,the tracking controller is designed for permanent-magnet synchronous motors under unknown period DoS attacks;finally,a hardware-in-the-loop simulation experiment is conducted on the experiment platform of permanent-magnet synchronous motors based on d SPACE to verify the availability and feasibility of the monitor designed controller.