AUTHOR=Li Yue , Yang Pengcheng , Peng Yonggang , Weng Chudi , Sun Jing , Shen Haijiang , Xia Yanghong , Wei Wei 

TITLE=A unified decentralized framework for isolated interlinking converters of hybrid DC/AC microgrids

JOURNAL=Frontiers in Energy Research

VOLUME=Volume 10 - 2022

YEAR=2023

URL=https://www.frontiersin.org/journals/energy-research/articles/10.3389/fenrg.2022.1008698

DOI=10.3389/fenrg.2022.1008698

ISSN=2296-598X

ABSTRACT=Due to the advantages of effectively integrating diversified loads and renewable sources, hybrid DC/AC microgrids have attracted the common attention of industry and academia. Meanwhile, with the increase of power electronic devices connected to the system, the complexity of the system increases, which puts forward higher requirements for galvanic isolation and intelligent control methods. To solve the above problems, this paper proposes a unified decentralized framework for Isolated Interlinking Converters (IICs) in hybrid DC/AC microgrids, including topology and control strategy. Firstly, in terms of topology, dual active bridge (DAB) is adopted to realize galvanic isolation and DC voltage conversion, which can facilitate the interconnection of DC microgrids or combined with VSC for the interconnection of DC and AC microgrids. Secondly, in terms of control strategy, a bidirectional voltage supporting control strategy is proposed for IICs, in which frequency and voltage are adopted as the indications to balance the power and strengthen the inertia interaction of microgrids. Furthermore, with the proposed control strategy, the voltage sources of different microgrids can share the power fluctuation, cooperatively. The stability of the proposed strategy is analyzed and the effectiveness is verified by several HIL experiments.