The Co-design Between New Event-triggered Communication Scheme And Robust Fault-tolerant Control For Networked Control Systems

With the development and integration of communication technology, control theory, and network technology, the networked control systems(NCS)has more extensive applications and plays a more and more important role in modern industrial process. The fault-tolerant control of NCS is particularly important to improve the reliability and security of the system due to the large-scale of NCS. Yet so far the most study in fault-tolerant control of NCS is under the traditional periodic time-triggered communication scheme(PTTCS). And this leads the study of NCS that integrated control and communication divided into control and communication, the two separate portions. Beside from this, the transmission of a huge redundant data under PTTCS increasing the network congestion. Especially for wireless communication sensors, the energy consumed by the transmission of data much larger than the energy calculation instruction executed consumed. Researchers have proposed the discrete event-triggered communication scheme to solve the problem. But it still has shortcomings.Based on this, this paper analyzed the disadvantaged of discrete event-triggered communication scheme then proposed a new discrete event-triggered communication scheme constrained by transient and steady-state. This paper studied on the co-design between fault-tolerant control for NCS and TS-DETCS. The main work include the following aspects:1)Proposed a new TS-DETCS and established the closed-loop fault NCS model under TS-DETCS Analyzed the negative impact of several typical discrete event-triggered communication scheme on NCS, the proposed a new TS-DETCS. Based on state feedback control law, making the NCS properties, failure models and trigger conditions unified together, under TS-DETCS, a closed-loop fault model of NCS is established.2)Studied on the co-design between TS-DETCS and robust fault-tolerant control of NCS Based on TS-DETCS, making use of Lyapunov stability theory and improved Jensen inequality the sufficient conditions were obtained for NCS with robust integrity, robust H￥ fault tolerant and robust generalized H￥ fault tolerant, and a co-design method for fault tolerant controller and communication resources share was given by solving LMI approach. At last, illustrated the advantage of TS-DETCS by comparing TS-DETCS with several typical DETCS through a simulation example.3)Studied on the co-design between TS-DETCS and less conservative robust fault-tolerant control for NCS Focused on increasing the conservatism of controller caused by introduction of multi-target performance constraint, reconstructing a new Lyapunov functional, making use of improved Wirtinger inequality and improved reciprocally convex combination inequality, the sufficient conditions were obtained for NCS with robust integrity, robust H￥ fault tolerant and robust generalized H￥ fault tolerant. Finally, compared the new method and other methods and analyzed the advantage of new method in terms of reducing conservative of controller.4)Combined the outcome of non-uniform sampling control system with robust fault-tolerant of NCS Combined the event generator and sensor as a virtual non-uniform sampling sensor, then we can treat NCS as a non-uniform sampling control system. In consideration of time-varying non-uniform sampling period kh, making use of Lyapunov stability theory, the sufficient conditions were obtained for NCS with robust integrity, robust H￥ fault tolerant and robust generalized H￥ fault tolerant. Finally, the simulation example demonstrated the correctness of the results...