Attack Detection And Hardware-in-the-loop Simulation Verification Of Cyber-physical Power Systems

Cyber-physical System(CPS)is an integrated system in which the control network and communication network monitor the physical system while the three are closely linked and coordinated,modern power grids have gradually developed into a perfect integration of power systems and CPS.However,while information networks have significantly optimized the Cyber-physical Power System(CPPS)and coordinated control,they have also created many potential risks,attacks such as those that occur in information networks can threaten the safe and stable operation of the entire CPPS as the information network interacts with the integration of the power system.Therefore,the timely detection of CPPS attacks is significant to ensure the steady-state operation of CPPS.In view of this,the study of attack detection and semi-physical simulation verification was carried out with CPPS as the object of study,and the main research work is as follows:Firstly,a modern approach to CPS fusion modeling is investigated,from the establishment of individual information modules and physical modules to the mutual integration between multiple information-physical modules,which enables the mutual mapping of information and physical quantities and the mutual fusion of physical systems and information systems;At the same time,a three-machine,nine-node CPPS model was built based on this modeling method,and the model was further simulated and analyzed to prove that the operation results of the built model meet the actual operation requirements,an effective model support for semi-physical simulation verification of attack detection based on a three-machine,nine-node CPPS model.Secondly,an observer-based method for reconstructing and detecting attack signals is proposed for actuator attacks and sensor attacks suffered in CPPS;By deriving the mathematical model of CPPS,robust observer and sliding mode observer are designed,and the attack signal reconstruction of actuator attack and sensor attack in CPPS is realized based on these two observers respectively,and then the final determination of actuator attack and sensor attack in CPPS is completed by the attack detection logic;After further simulation and analysis,the robust observer and sliding mode observer can accurately and quickly reconstruct the actuator attack signal and sensor attack signal suffered in CPPS,and effectively complete the detection of actuator attack and sensor attack.Finally,using the advantage of semi-physical simulation to be close to the actual working conditions,adopts the three-machine nine-node CPPS model built in Chapter 2 instead of the actual system,and completes the connection of external hardware information communication and the compilation of internal software programs on the Star Sim semi-physical simulation platform to verify the theory of attack reconstruction and detection based on robust observer for actuator attack and sensor attack in CPPS,and the theory of attack reconstruction and detection based on sliding mode observer for CPPS,the results of the semi-physical simulation verification are also analyzed in detail.