Optimal Communication Topology Restoration for Islanded AC Microgrids under Denial-of-Service Attacks

This paper presents an optimal communication topology restoration method under denial-of-service (DoS) attacks. Firstly, a general hierarchical control framework for AC microgrids, including primary, secondary, and tertiary control, is introduced. Secondly, the attack effect is investigated by considering a non-ideal communication network where DoS attacks occur among the information exchanges of secondary control. Then, to eliminate the DoS attacks effect, an optimal communication topology restoration method is proposed. Notably, two indexes, including communication cost and convergence speed, are considered, and the optimal problem is formulated as a mixed integer semidefinite program. Lastly, the effectiveness of the proposed method is validated by time-domain simulations.