6Manjrekar M D, Kieferndorf R, Venkataramanan G. Power electronic transformers for utility applications[C] // Conference Record of the 2000 IEEE-IAS Annual Meeting. Rome, Italy: IEEE, 2000: 2496-2502.
7Marchesoni M, Novaro R, Savio S. AC locomotive conversion systems without heavy transformers: is it a practicable solution[C]//Proceedings of the 2002 IEEE International Symposium on Industrial Electronics. L'Aquila, Italy: IEEE, 2002: 1172- 1177.
8EPRI. Proof of the principle of the solid-state transformer the AC/AC switch mode regulator: EPRI TR-105067, Research Project 8001-13, Final Report[R]. [S. l. ].. EPRI, 1995.
9Harada K, Anan F, Yamasaki K, et al. Intelligent transformer [C]//Conf Ree of IEEE PESC. Baveuo, Italy: IEEE, 1996:1337-1341.
10YUAN Cheng-ren, Ming Xu, Gary Yao, et al. A novel simple and high efficiency DC/DC transformer[C]// CPES'2002. Blaeksburg, USA: IEEE, 2002: 173-177.