Cyber-attack Tolerant Control of Complex Interconnected Systems: Output Feedback Stabilization Approach

This paper presents a Cyber-Attack (CA) tolerant control approach for complex nonlinear cyber-physical systems. The proposed method is stationed on an output feedback observer-based control dedicated to reducing the effects of cyber-physical attacks on the control transmission channels as well as the interconnections. The modeling of the attacks in the global dynamic model is inserted into both the structure of the actuators the sensors. The synthesis problems of control and observer gains are tackled by solving a Bilinear Matrix Inequality (BMI) and implementing a switching condition for the control gains. A transformation of the BMI problem to a linearization one trought Linear Matrix Inequalitiy (LMI) is proposed. The suggested approach involves with the use of a special form of Lyapunov function and the application of Differential Mean Value Theorem (DMVT) on the nonlinear fuctions. The theoretical results are validated simulations on a 3-tank system model.