Distributed Resilient Secondary Control for AC Microgrid Under FDI Attacks

This brief is concerned with both voltage and frequency regulation problem for AC microgrid under false data injection (FDI) attacks in the secondary control layer. A distributed convergent observer is first designed based on an iterative mean estimation technique, which can accurately estimate the attack signals with theoretical proof of convergence provided. Based on the iterative mean estimation information, a distributed resilient controller is designed to compensate for the effect of cyber attacks in the secondary control layer. It is theoretically shown that the proposed strategy can restore accurate regulation of the voltage and frequency of AC microgrid in the presence of FDI attacks in the secondary control layer. Finally, an AC microgrid system containing four distributed generations and two leader nodes is constructed in MATLAB/Simulink for simulation, and the results validate that the proposed controller is effective for regulating voltage and frequency.