  This paper presents a method for controlling the voltage of inverter-based
Microgrids by proposing a new scale-free distributed cooperative controller.
The communication network is modeled by a general time-varying graph which
enhances the resilience of the proposed protocol against communication link
failure, data packet loss, and fast plug and play operation in the presence of
arbitrarily communication delays. The proposed scale-free distributed
cooperative controller is independent of any information about the
communication system and the size of the network (i.e., the number of
distributed generators). The stability analysis of the proposed protocol is
provided. The proposed method is simulated on the CIGRE medium voltage
Microgrid test system. The simulation results demonstrate the feasibility of
the proposed scale-free distributed nonlinear protocol for regulating the
voltage of Microgrids in presence of communication failures, data packet loss,
noise, and degradation.
