Co-Design of Dynamic Event-Observer-Based Security Control for Interconnected Nonlinear Power Systems Under Actuator Deception Attacks

This study investigates the security control problem of interconnected nonlinear power systems (INPSs) involving the wind farm subjected to actuator deception attacks. A dynamic event-observer-based sliding mode controller is presented to guarantee the stability of the INPSs. First, a novel memory-based integral composite observer is presented to estimate the unknown variables, including lumped disturbances, deception attack functions and partial states of the power system. In this estimation scheme, a dynamic event condition is designed to achieve the transmission efficiency. Then, based on the estimation outputs, an observer aided sliding mode manifold is designed, and the stability of the overall INPSs is analyzed after the trajectory of the power system reach onto the manifold. Moreover, a security controller is designed to ensure the reaching ability and to recover the system performance with the help of the estimation values. Finally, the compensation ability of the presented method is verified by a class of two area power systems.