Study of a Bidirectional Power Converter Integrated with Battery/Ultracapacitor Dual-Energy Storage

Ching-Ming Lai, Jiashen Teh, Yuan-Chih Lin and Yitao Liu
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Ching-Ming Lai: Department of Electrical Engineering, National Chung Hsing University, Taichung 420, Taiwan
Jiashen Teh: School of Electrical and Electronic Engineering, Engineering Campus, Universiti Sains Malaysia (USM), Nibong Tebal 14300, Penang, Malaysia
Yuan-Chih Lin: Department of Electrical Engineering, National Taiwan University, Taipei 106, Taiwan
Yitao Liu: College of Mechatronics and Control Engineering, Shenzhen University, Shenzhen 518060, China

Energies, 2020, vol. 13, issue 5, 1-23

Abstract: A patented bidirectional power converter was studied as an interface to connect the DC-bus of driving inverter, battery energy storage (BES), and ultracapacitor (UC) to solve the problem that the driving motor damages the battery life during acceleration and deceleration in electric vehicles (EVs). The proposed concept was to adopt a multiport switch to control the power flow and achieve the different operating mode transitions for the better utilization of energy. In addition, in order to improve the conversion efficiency, the proposed converter used a coupled inductor and interleaved-pulse-width-modulation (IPWM) control to achieve a high voltage conversion ratio (i.e., bidirectional high step-up/down conversion characteristics). This study discussed the steady-state operation and characteristic analysis of the proposed converter. Finally, a 500 W power converter prototype with specifications of 72 V DC-bus, 24 V BES, and 48 V UC was built, and the feasibility was verified by simulation and experiment results. The highest efficiency points of the realized prototype were 97.4%, 95.5%, 97.2%, 97.1%, and 95.3% for the UC charge, battery charge, UC discharge, the dual-energy in series discharge, and battery discharge modes, respectively.

Keywords: battery/ultracapacitor; dual-energy; bidirectional power converter; electric vehicles (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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