Cyber Physical Security of Energy Hubs Using Feasibility Area Estimation

The deployment of energy hubs created from the integration of power and gas systems mandates the implementation of a robust cybersecurity protocols to protect such energy hubs from being compromised. Stealthy False Data Injection (FDI) attacks, which mask the system operation, have the ability to infiltrate through the FDI detection prevention layer that would adversely affect the system operation on even make the system inoperable. In this paper, a new method is proposed for detection of the cyberattacks that have bypassed the FDI prevention layers. Using healthy historical operating data of the system, a feasibility area representing the normal operation conditions, is estimated for each state variable in the integrated power and gas system. By collecting the main system parameters, such as bus phasor voltages, phasor current, apparent power, node gas pressure, and pipeline gas flow, the FDI is detected. The simulation results indicate the efficacy of the proposed method in detecting stealthy cyberattacks that have not been revealed by the preventive layer.