Resilient Control Under Event-triggered Communication Scheme And Its Application

Due to the constraints of communication resources and the characteristics of communication network with high link openness in NCSs,it is more vulnerable to eavesdropping,data tampering,interception and other malicious attacks,and the security issue of NCSs is facing greater challenge Therefore,it is of great importance to investigate the resilient control(or attack-tolerent control)problem of NCSs under cyber attacks.This thesis focus on the resilient control for resource-constrained NCSs,where the effects of the uplink/downlink qunatinzation,event-triggering and DoS attacks are considered.In addition,application studies of the proposed theoretical results on the control of nonlinear direct current microgrids(DC microgrids)will be conducted.The main content of this research are as follows:The co-design of the resilient quantized state feedback controller and event-triggered communication scheme of linear uncertain NCSs under quantizations and periodic DoS jamming attacks is studied.Under an assumption that the DoS jamming period is known,a new event-triggered communication scheme based on the jamming period is designed.By adopting the PLKF and switched system approach,the exponential stability of the resultant switched system is analyzed and the quantitative relationship among the sampling period,jamming period and the convergence/divergence rate of the proposed PLKF is established.The co-design method of the triggering parameter and resilient quantized controller gain is presented.The joint design of H? controller and event-triggered communication mechanism for linear NCSs with uplink quantization and nonperiodic DoS attacks is investigated.Different from the above periodic DoS attacks model,the nonperiodic DoS attacks model is characterized by an average dwell time,the uniform lower(upper)bound of the inactive(active)time of DoS attacks A new resilient event-triggered communication scheme is proposed.Based on PLKF and LMIs technique,the quantitative relationship among the sampling period,the DoS parameters,the convergence/divergence rate of the chosen PLKF,and H? performance index is established.The triggering parameter and resilient quantized controller gain are obtained.The event-triggered resilient tracking control for a class of nonlinear NCSs under intermittent DoS attacks is studied.A new resilient event-triggered scheme involved the states of the plant and the reference model is designed to reduce the data transmissions over the sensor-to-controller(S-C)channel and counteract the DoS attacks.An unified event-triggered T-S fuzzy switched model is established.Using a PLKF together with LMI technique,a new criterion is derived to ensure exponential stability of the resulting switched tracking error system while achieving a weighted H?performance level.The relationship among the DoS parameters,the triggering parameters,the fuzzy controller gains,the sampling period,and the decay rate can be quantitatively characterized.The triggering matrix parameter and fuzzy controller gains are co-designed.The event-based resilient fuzzy controller design for DC microgrids with CPLs under spasmodic DoS attacks is addressed.Different from the above DoS attacks model,only the DoS attack frequency and DoS duration are restricted here.A resilient event-triggered communication scheme is introduced to save communication resources while resisting the spasmodic DoS attacks The nonlinear DC microgrids with CPLs is modeled as a T-S fuzzy system through the sector nonlinearity approach.By employing the PLKF approach,some sufficient conditions to guarantee system stability are obtained in terms of LMIs.The triggering matrix parameter and fuzzy controller gains are designed simultaneously.