Super-twisting nonsingular terminal sliding mode control for cyber physical system under FDI attacks

This paper proposes a novel super-twisting nonsingular terminal sliding mode (SNTSM) control strategy for cyber physical system under false data injection (FDI) attacks. A fast terminal sliding mode observer (FTSMO) is designed to simultaneously reconstruct FDI attacks and estimate system state values in finite time. The FTSMO adopts second-order nonsingular terminal sliding mode control and the constant exponential coefficient reaching law, which endows FTSMO with robustness, fast estimation speed and low chattering. Then a two-layer adaptive scheme is employed and the adaptive FTSMO is developed, so that the prior knowledge of the FDI attacks is not required. Based on the output of proposed AFTSMO, a SNTSM controller is designed to ensure stronger robustness and fast convergence while suppressing chattering. Simulation results confirm the excellent control performance of the proposed method.