Sliding mode observer-based load frequency control of multi-area power systems under delayed inputs attack

This paper investigates the state estimation on load frequency control (LFC) of multi-area power systems under delayed inputs attack. First, the LFC system under time-delay switch attack is modeled by formulating time-delay switch attacks as a switch action. Then, an observer to estimate system states is designed, and sliding surfaces with a discontinuous controller are constructed to the guarantee asymptotical stability of the LFC system. Finally, a sliding mode controller is constructed to ensure the reachability of the systems trajectories.