Distributed Secondary Control for Islanded DC Microgrids With Event-Triggered Quantization Communication

In this paper, islanded multibus DC microgrids (MGs) with constrained digital communication network are considered. A novel distributed control strategy based on an event-triggered quantization communication scheme is proposed in the secondary layer for regulating global average voltage and load currents sharing. In particular, each distributed generator (DG) sends quantized information to its neighboring DGs only when the triggered condition is satisfied; thus, the communication burden in terms of communication frequency and the amount of data transmitted through the network is significantly reduced. The introduction of both event-triggered and quantized schemes raises the difficulty in stability analysis of the designed control. A comprehensive analysis via LaSalle's invariant-set principle is provided to give sufficient conditions for voltage regulation and precise current sharing. Finally, the proposed control strategy is further validated by an example simulation.