Defense Control Scheme Against False Data Injection Attack In Smart Grid

With the rapid development of science and technology in our country,the traditional power system has gradually been developed into smart grid,which is a typical cyber physical system.However,due to the excessive dependence on communication technology,smart grid has become open and complex.Therefore,it is urgent and important for us to study the security of smart grid.Considering the structural characteristics of smart grid system and the behavioral characteristics of false data injection attacks,this article will study the defense control against false data injection attacks in smart grid.The main work is as follows:At first,in order to protect smart grid from false data injection attack,a passive defense method based on adaptive control is proposed.A dynamic physical grid model under attack is established,in which model uncertainty is considered.Based on this,the adaptive defense controller is designed to update and adjust the states of the system constantly,so that the system can return to be stable after being attacked quickly.Finally,a simulation example verifies the effectiveness of the defense method.Secondly,an active resilient defense algorithm against stealthy false data injection attack is proposed.At first,the large-scale smat grid system is divided into some regions according to the sparseness of smart grid system structure,and interval observers are designed for each region to estimate the system states.Corresponding to the detection results,the resilient defense controller is triggered to work if the system states are affected by FDIAs.The designed resilient defense controller breaks through the fragility of the conventional controller.The gain of resilient controller has a certain gain margin,it can be obtained by solving the multi-dimensional LMI.Finally,the effectiveness of the designed active resilient defense algorithm is verified.Finally,for the defense study after the location of detected false data injection attack,a defense algorithm against false data injection attack based on resilient interval observer is proposed.The resilient interval observer is designed to estimate the states of each subarea,and then the interval residual is calculated.The specific position of the attack can be located by matching the obtained interval residual with the logica location matrix.After locating the specific location where false data injection attack occurred,the resilient defense controller is designed with matrix decomposition theory.Finally,the effectiveness of the proposed algorithm is verified by simulation results.