Distributed Dynamic Event-Triggered Control for Voltage Restoration and Current Sharing in DC Microgrids

Abstract

Due to the droop control applied in islanded DC microgrids, DC bus voltage recovery, and current sharing cannot be guaranteed simultaneously. To solve this problem, a distributed dynamic event-triggered control method is proposed in this paper. The presented control scheme can remove DC bus voltage deviation while achieving the current sharing among distributed generation (DG) units. In addition, the proposed method requires no global information, and only the DC bus voltage from the physical network is needed. Moreover, the data of neighboring DGs at only event-triggered times are involved, which greatly reduces the communication burden of the DC microgrid communication network. The stability of the proposed method is demonstrated through the Lyapunov function, and Zeno behavior can be excluded as well. Finally, the experimental results with four case studies are presented to validate the effectiveness of the proposed method.