3Carr J A, Balda J C, Mantooth H A. A survey of systems to integrate distributed energy resources and energy storage on the utility grid[C]. //IEEE Energy 2030 Conference. 2008: 1-7.
4Chung Y H, Kim H J, Kim K S, et al. Power quality control center for the microgrid system[C]. //The 2nd IEEE Power and Energy Conference. 2008: 942-947.
5Schainker R B. Executive overview-energy storage options for a sustainable energy future[C]. //IEEE PES General Meeting. 2004:2309-2314.
6Kawakami N, Sumita J, Nishioka K, et al. Study of a control method of fuel cell inverters connected in parallel and verification test result of an isolated micro grid[C]. //Power Conversion Conference. 2007:471-476.
7ZHANG Hui, WANG Xin, REN Jing, et al. Research on superconducting magnetic energy storage in the photovoltaic distributed generation[C]. //The 6th IEEE International Power Electronics and Motion Control Conference, 2009: 2198-2202.
8Tao H, Kotsopoulos A, Duarte J L, et al. A soft-switched three-port bidirectional converter for fuel cell and super capacitor applications[C]. //IEEE 36th on Power Electronics Specialists Conference. 2005: 2487-2493.
9Feng X, Liu J, Lee F C. Impedance specifications for stable DC distributed power systems[J]. IEEE Trans on Power Electronics , 2002, 17 (2).. 157-162.
10Zhang C, Tseng K J. A novel flywheel energy storage system with partially-self-bearing flywheel-rotor[J]. IEEE Trans on Energy Conversion, 2007, 22 (2): 477-487.