Cyber-Secure Self-healing Secondary Voltage Control Method in Isolated AC Microgrids under FDI Attacks on Communication Links

With the advancement of communication networks, MGs increasingly function as cyber-physical systems (CPSs), making them more vulnerable to cyber-attacks. Faults and cyber-attacks (CAs) can severely disrupt the operation of microgrids (MGs), impacting critical parameters and threatening overall system stability and security. To mitigate these risks, a cyber-secure control approach is required. The integrity of the system can be undermined through the injection of falsified data within inter-controller communication links To address these challenges, this paper introduces a cyber-secure self-healing secondary voltage control method that enhances the resilience of isolated AC MGs against cyber threats. The proposed distributed architecture minimizes system vulnerability while maintaining the performance of secondary controllers under false data injection (FDI) attacks. The method is validated through MATLAB/Simulink simulations. Results indicate that the proposed approach not only preserves MG stability with rapid response but also efficiently suppresses small voltage disturbances, restoring the system to its pre-attack operating state.