Research On Attack Detection And Location Of Dynamic Load Altering Attack In Cyber Physical Power System

With the rapid development of communication technology and control technology,the in-depth integration of informatization and industrialization,the connection between cyber system and traditional physical equipment is also gradually close,in this background,the cyber physical system(CPS)was born.As the frontier research direction in the field of control,the integration of cyber field and control field also provides a new development direction for the traditional power system——Cyber physical power system(CPPS).The formation and development of CPPS,while bringing great convenience and economic benefits to modern society,has also given rise to more security risks,and the not yet fully formed network defense system has become the target of many hacker organizations,which makes the security risks originally existing in the information system penetrate into the power system,threatening the stable operation of the entire power system.As one of the CPPS,the smart grid has the ability to self-heal,motivate and protect users from attacks,but the high reliance on network communication systems also makes the impact of information system anomalies on the stability of the smart grid significantly increased.This paper takes the attack detection and location of the CPPS as the research direction.Based on the analysis of the current situation of domestic and international research,the paper conducts an in-depth research on the smart grid system subject to dynamic load altering attack(D-LAA).The main research contents of the paper are as follows:(1)Research on attack detection and reconstruction based on sliding mode observer.A sliding mode observer with H_?performance is designed and a residual system is generated in the case that two load buses in a power system are simultaneously attacked by D-LAA.Subsequently,a detection logic is introduced to detect the attack by comparing the threshold value with the residuals.Finally,the feasibility and accuracy of the designed attack detection theory is verified by numerical simulation as well as the StarSim hardware-in-the-loop simulation platform.(2)Research on attack detection and localization based on finite time observer.For the attack localization problem in CPPS,an attack localization method based on finite-time observer is proposed,and the sufficient conditions and theoretical proof process for the observer to hold are given,and the attack localization device designed can be triggered in a finite time when the D-LAA attack occurs.(3)Attack Detection and Localization Based on Adaptive Sliding Mode Observer.An adaptive sliding mode observer with robust performance is designed for the attack detection and localization problem of D-LAA in smart grid.Firstly,a modified system model is given,and secondly,an adaptive observer is designed,and the detection logic and attack localization algorithm are proposed based on the residual system generated by the observer,so as to detect and localize the single-point closed-loop D-LAA in the system and add H_?performance to enhance the system anti-interference capability.Subsequently,through simulation experiments,the feasibility of the proposed attack detection logic and attack location algorithm was verified.Finally,the research content is summarized,and the development trend of this topic is prospected.