AUTHOR=Xie Haodong , Li Zhenqiu , Yang Qixiong , Peng Zhihui , Wu Aohua TITLE=A Multi-Closed-Loop Assessment Mechanism for Development Level of Smart Grids JOURNAL=Frontiers in Energy Research VOLUME=10 YEAR=2022 URL=https://www.frontiersin.org/journals/energy-research/articles/10.3389/fenrg.2022.901906 DOI=10.3389/fenrg.2022.901906 ISSN=2296-598X