Observer Based Paradigm for Resilient Secondary Control of AC Microgrids

This paper presents a novel resilient secondary control for a cooperative control based AC microgrids against false data injection (FDI) attack. The prime objectives of a secondary control are voltage v and frequency ω restoration while sharing proportional active and reactive power. In cooperative secondary control based microgrid system these objectives are achieved using peer to peer communication channel. For this, an observer is developed to estimate the presence of external disturbance (FDI) in the V and ω values using distributed communication. These estimated disturbances are then rejected using disturbance rejection in the secondary control making it resilient against FDI attacks. The proposed controller accurately estimates the disturbances in the system and hence precisely handles both internal(at sensors) and external( at communication) FDIs. The proposed resilient controller is validated by simulating a four DERs based microgrid operated under different disturbances like constant and bounded FDI attacks in MATLAB/SIMULINK environment.