Research On The Invulnerablity And Dynamic Attack-defense Game Of Cyber Physical Power System

With the rapid development of information technology,power system has gradually developed into a cyber physical system(CPS).Information technology makes the power system more efficient and intelligent,but at the same time,it also brings some risks and increases the vulnerability of the system.The traditional power system research only takes the electric system as the object and cannot fuse heterogeneous information systems.At present,the research on electric CPS has just started and many problems remain to be solved.In order to get closer to the characteristics of actual electric system,the localized electric CPS model based on geographical location is firstly established in this paper.Then the cascading failure process of electric CPS under different physical attacks is studied.Finally,considering the actual dynamic attack-defense process,the effect of different attack and defense strategies on electric CPS cascading failure is studied based on the attack and defense game.The main contents are as follows:(1)localized electric CPS model based on geographical location is established.Based on the analysis of localized network and actual power system structure,the static model of localized electric CPS based on geographical location is constructed from the three aspects of power network structure,information network structure and power-information coupling relationship.Considering hierarchical connectivity of the information network and the cascading failure process of dc power flow in power system,a dynamic model of localized electric CPS is constructed.(2)the impact of physical attack on the invulnerablity of localized electric CPS is studyed.Based on the analysis of the characteristics of electric CPS,the evaluation index of its invulnerablity in stability is established,and then the impact of power network attack,information network attack and regional attack on the invulnerablity of electric CPS is studied,and by changing the attack mode,the difference between random attack and deliberate attack of power CPS destruction resistance is compared and analyzed,then the corresponding weak links and protection measures of the system are pointed out.(3)the invulnerablity of electric CPS under dynamic attack-defense game is researched.By analyzing the process of attack and defense in electric CPS,the strategy set that can be adopted is studied,and an attack-defense game model of three-layer planning is established,then the detailed process of attack and defense game experiment is developed.By allocating resources to the line,The vulnerability changes of power CPS when power network and information network are attacked and attack-defense game under localized attack are studied.In this paper,the localized electric CPS model based on geographical location isestablished,the cascading failure process of the system is studied by means of physical attack and attack-defense game,and the weak links and defense methods of the system are obtained.Relevant research and results can help better understand the coupling mechanism of electric CPS and provide guidance for the security protection of the new generation intelligent power system.