Research On Attack Methods And Effects For Power System State Estimation

With the concept of smart grid being put forward and applied,attacks against smart grid have begun to occur frequently.Previous studies have shown that through the acquisition of power grid information,attackers can launch false data injection attacks on the power system of the smart grid,and can construct attack vectors,so as to avoid the bad data detection technology in the smart grid and achieve the attack effect without being found,which is very hidden.This has also aroused widespread concern.At present,a large number of studies focus on the false data injection attack method and detection on SCADA of smart grid,but lack of attention to other attacks and the impact analysis of attacks on power system.At the same time,with the increasing application of wide area measurement system(WAMS)in power system,the security of hybrid state estimation combined with traditional SCADA system has become more and more important.Based on the existing attack research on power system,this paper studies the security of power system state estimation.The details are as follows:1)Based on the existing research on false data injection attacks,this paper further introduces another common network attack-denial of service attack,and studies an impact analysis method on smart grid power system with hybrid attacks.The hybrid attack model of false data injection attack and denial of service attack is established,and the conditions of mixed attack vector to avoid bad data detection in power system are given.At the same time,the mean square error of state estimation is derived based on the proposed hybrid attack model,so as to determine the quantitative impact of hybrid attack on state estimation.Finally,several different attack scenarios are simulated on IEEE 14 bus simulation system,and the interaction between false data injection attack and denial of service attack in hybrid attack is discussed.2)Aiming at the lack of research on the security of hybrid state estimation in power system with the coexistence of PMU(phase measurement unit)and RTU(remote terminal unit),this paper proposes a false data injection attack method for PMU in hybrid state estimation,which changes the data on the attacked PMU by describing the nonlinear relationship between state variables in hybrid state estimation and internal measurements of power system,And achieve the preset attack effect.Simulation experiments are carried out on IEEE 30 bus to verify the effectiveness of the method.3)Based on the lack of internal topology information of power system,this paper studies a violent false data injection attack method based on random number.In the state estimation based on weighted least squares and Kalman filter,the impact of the proposed violent false data injection attack on the smart grid power system is studied.Based on the proposed attack method,simulation experiments are carried out on the IEEE 14 bus simulation system to simulate the two possible behavior modes of the attacker,The probability of successful attack in two different state estimators is analyzed and discussed.