6Iglesias I J, Acero J. Comparative studyand simulation of SMES systems [ J]. conductivity, 1998, optimal IEEE 5 (2) converter topologies for Trans. on Applied Super- : 254 - 257.
8Zhongchao Zhang, Boon-Teck Ooi. Multi- modular current-source SPWM converter for a super- conducting magnetic energy storage System [ J ]. IEEE Trans. on Power Electronics, 1993, 3 (8): 250 - 256.