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Research On The Co-design Method Of Cyber Physical System Integrated Security Control And Communication Under DoS Attack

Posted on:2021-05-21Degree:MasterType:Thesis
Country:ChinaCandidate:K F WeiFull Text:PDF
GTID:2428330623483752Subject:Pattern Recognition and Intelligent Systems
Abstract/Summary:PDF Full Text Request
Cyber-Physical System(CPS)is a complex system which integrates computing,communication and control technologies with the introduction of the network on the basis of traditional control system.Because of its advantages in performance,CPS is widely used in smart power grid,energy Internet,intelligent transportation and other important industries related to the national economy and people's livelihood.However,due to the complexity of the CPS structure and the openness of the network,physical equipment faults and network attacks have caused CPS security problems to become particularly prominent and urgent.In recent years,a series of CPS security incidents can be seen that denial of service(DoS)attacks occur most frequently.In addition,the transmission and calculation of massive perception data in CPS under limited network resources make CPS research pay more attention to the effective use and optimal allocation of resources.Therefore,it is of far-reaching significance for CPS to ensure the safe operation of CPS on the premise of effectively saving network resources.At present,although a lot of research achievements on CPS security control have been made,there is still little research on the problem of CPS integrated security control with the coexistence of fault and attack.Therefore,based on the idea of fault-tolerant control,this thesis will study the collaborative design of CPS integrated security control and Communication based on Discrete Event-Triggered Communication Scheme(DETCS)for CPS with actuator fault and limited energy DoS attack.The details are as follows:1)According to the principle of applying of DoS attack,DoS attacks are described as a special type of continuous packet loss on the system.At the same time,with the concept of edge computing and fault-tolerant control,under DETCS,a CPS security control architecture is constructed which integrates perception,communication,fault tolerance and attack tolerance with a unified framework.Based on the consideration of DoS attack duration,a closed-loop fault CPS model including trigger conditions,fault tolerance and attack tolerance is established,which lays a foundation for the research on the cooperative design of CPS integrated security control and communication.2)Based on the Lyapunov stability theory,an appropriate Lyapunov-Krasovskii function is constructed,and a new affine Bessel-Legendre inequality with less conservatism is used.Then the design method of robust H_?observer for state and fault estimation and CPS fault active tolerant,attack passive tolerant security controller is deduced under DoS attack,which realizes the collaborative design of CPS active fault-tolerance,passive attack-tolerance and communication.3)Considering the target constraints such as?-stability and?suppression performance,it is deduced that the state and fault estimation observer with multi-target constraints under DoS attacks and the CPS fault active tolerance,attack passive tolerance and communication collaborative design method.By obtaining the maximum allowable delay of the system,the maximum continuous packet loss of the passive tolerant DoS attack can be obtained,and then the compromise balance of CPS active fault tolerance,passive attack tolerance,and communication under multiple targets is achieved.4)Based on the connection between the maximum allowable delay of the system and the duration of the DoS attack,a DoS attack detection mechanism based on the maximum allowable delay of the system and a data compensation strategy under the DoS attack are proposed.Combined with the coordinated design of CPS active fault tolerance,passive attack tolerance and communication under multi-target constraints,then the collaborative design goal of multi-objective constraint CPS active fault tolerance,active-passive attack tolerance and communication under DoS attacks is completed.
Keywords/Search Tags:Cyber-Physical System, Denial of Service Attack, Discrete Event-Triggered Communication Mechanism, Integrated Security Control, Attack Detection and Compensation
PDF Full Text Request
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