Research On Security Control Of Cyber-Physical System Based On DoS Attack

With the rapid development of science and technology,Cyber-Physical-Systems(CPS)are widely used in aerospace,intelligent manufacturing,smart grid and other fields,but with the progress of technology and the openness and interconnection of communication networks,it not only increases the frequency and depth of internal and external interaction of CPS systems,but also makes it more vulnerable to various types of network attacks and indirectly affect the stability and security of the physical plant or even the entire system.Therefore,the study of CPS issues is essential to ensure the safe and stable operation of the system.Denial-of-Service(Do S)attacks usually block communication channels,which may lead to data loss,as well as cause economic losses and even social unrest.Therefore,an in-depth study of CPS security is essential to ensure the safe,stable and reliable operation of the system.First,this paper briefly introduces the research background and significance,and describes the current status of domestic and international research on control issues related to CPS.Then,the security control problem of CPS under Do S attack is discussed with the current research status at home and abroad.Based on the information layer and physical layer indicators and the knowledge of game theory,this paper proposes a method based on game theory to find the information layer strategy to design the best controller,and through simulation experiments,it is proved that the controller designed in this paper using the knowledge related to game theory can ensure the stable operation of the system.Secondly,the security control problem of CPS with unknown information layer state transfer probability matrix under Do S attack based on the event trigger mechanism is studied,and a cross-layer design algorithm combining physical layer indicators and information layer indicators is proposed,and the auxiliary matrix is derived by using an iterative algorithm through the learning method in the policy,and then the relationship between packet loss expectation and attack and defense policy is used to find out the system’s packet loss caused by Do S attack probability,and the controller and observer gains of discrete CPS are obtained by solving the linear matrix inequality.It is verified by simulation that the designed controller can guarantee the normal operation of the system with greater probability.Then,the control problem of CPS based on T-S fuzzy model under Do S attack is investigated.The fuzzy rules of the system are given in the fuzzy form of “IF-THEN”,the design rules of the fuzzy controller are given by the control method of Parallel-DistributedCompensation(PDC),and the controller based on the T-S fuzzy model designed in this paper can ensure the safe and stable operation of the system through several simulations.Finally,the content of this paper and the innovation points of this paper are summarized comprehensively,and the next research directions and research contents are given through analysis.