Sliding Mode Resilient Control and Application Based on Intermediate Variable Observer in Smart Grid

This paper focuses on the reliable operation of cyber-physical systems (CPS) under malicious attacks. First of all, according to the characteristics of false data injection (FDI) attacks and dynamic load altering (DLA) attacks, a type of power CPS system model with process attacks is established. Secondly, a state estimation method and security control strategy are designed, respectively. Specifically, 1) In order to estimate the system state and reconstruct the attack signal, an intermediate variable observer is designed, 2) An integral sliding mode control strategy is proposed by using the reconstructed attack information and system error information to automatically eliminate the impact of the attack on the power CPS system. Finally, using the digital simulation and hardware-in-the-loop simulation platforms constructed by StarSim, a three-generator and six-bus power system is used as an example, the effectiveness of the proposed control strategy in theory and practical application is verified.