5He Jinwei,Li Yunwei. Analysis,design, and implementation of virtual impedance for power electronics interfaced distributed generation[J].IEEE Transactions on Industry Applications,2011,47 (6):2525~2538.
10Guerrero J M, Hang Lijun, Uceda J. Control of distributed uninterruptible power supply systems[J]. IEEE Trans. Industry Electronics, 2008, 55(8): 2845-2859.