creator Tang, Yichao advisor Khaligh, Alireza Batteries and ultracapacitors are likely to be candidates as excellent energy storage technologies for future shipboard power systems. This dissertation explores a hybrid Battery-Ultracapacitor Energy Storage System (BUCESS) for next generation shipboard application. Based on the power requirements of combat ships, a new configuration of the battery and ultracapacitor combined system is introduced for propulsion systems and pulse power loads. For one BUCESS unit, batteries and ultracapacitors are charged and discharged at high voltage level and high power level through a dual active bridge and a double-boost bidirectional converter. The converters are optimally designed to control the bidirectional power flow for batteries and ultracapacitors separately, and to ensure constant voltage regulation of ultracapacitors during charging and discharging. High-frequency switching devices are selected to achieve dc-dc conversion at high voltage and high power levels. The design guidelines and control schemes for simulations are provided for the proposed new topology. Finally, a double-input BUCESS unit is designed, analyzed and simulated to investigate different operation modes of the hybrid energy storage system. Submitted by Dana Lamparello (dlampare@iit.edu) on 2012-02-29T17:22:11Z No. of bitstreams: 2 MS_THESIS_BY_YICHAO_TANG.pdf: 1171936 bytes, checksum: a67701572c1764e5c585dd135b209a51 (MD5) ADVISOR_SIGNATURE_BY_DR_ALIREZA_KHALIGH.pdf: 30594 bytes, checksum: 805e596b9409040769050b75c6f08dbd (MD5) Made available in DSpace on 2012-02-29T17:22:11Z (GMT). No. of bitstreams: 2 MS_THESIS_BY_YICHAO_TANG.pdf: 1171936 bytes, checksum: a67701572c1764e5c585dd135b209a51 (MD5) ADVISOR_SIGNATURE_BY_DR_ALIREZA_KHALIGH.pdf: 30594 bytes, checksum: 805e596b9409040769050b75c6f08dbd (MD5) Previous issue date: 2011-05 M.S. in Electrical Engineering, May 2011 2011-04-22 2011-05 http://hdl.handle.net/10560/2535 en Thesis born digital application/pdf In Copyright http://rightsstatements.org/page/InC/1.0/ Restricted Access ECE / Electrical and Computer Engineering Illinois Institute of Technology Affiliated department