6LEE B H, SHIN D H, SONG H S, et al.Development of an advanced hybrid energy storage system for hybrid electric vehicles[J]. Journal of Power Electronics, 2009, 9(1):51-60.
7GAO D W, JIN Z H, LU Q C. Energy management strategy based on fuzzy logic for a fuel cell hybrid bus[J]. Journal of Power Sources, 2008,185:311-317.
8SAMOSIR A S, HALIM A, YATIM M. Implementation of dynamic evolution control of bidirectional DC-DC converter for interfacing ultracapacitor energy storage to fuel-cell system [J]. IEEE Transac- tions on Industrial Electronics, 2010,57(10):3468-3473.
9THYAGARAJAN G. On improving desing aspects of hybrid elec- tric vehicles[D]. Michigan: Wayne State University,2011.
10CAO J. Battery/ultra-capacitor hybrid energy storage system for electric, hybrid electric and plug-in hybrid electric vehicles [D].American: College of the Illinois, 2010: 7.