System-Level Factors Influencing AGC Cyber-Attack Success and RAS Vulnerability in Multi-Area Grids

Automatic generation control (AGC) stabilizes frequency and scheduled power exchanges among interconnected areas, yet its reliance on communication networks introduces cybervulnerabilities. This work examines coordinated AGC cyber-attacks in the presence of remedial action schemes (RAS) and identifies operating conditions under which an attacker can drive grid frequency beyond safe limits while evading RAS. A feedback-based attack policy is used to manipulate AGC signals and steer system frequency toward unsafe trajectories. Then, a large nested-loop parametric sweep—spanning attacked-area inertia relative to its interconnected neighboring area, AGC capacity versus maximum tie-line transfer, AGC update rate, load damping, and bi-directional power transfers—generates over 1.45 million…