Mobile QR Code QR CODE : The Korean Institute of Power Electronics
Title The Design of Interleaved Bi-directional DC-DC Converter for Fuel Cell and Battery Hybrid System
Authors Seung-Min Kim ; Ju-Yeop Choi ; Ick Choy ; Seung-Ho Song ; Sang-Cheol Lee ; Dong-Ha Lee
DOI 10.6113/TKPE/2013.18.1.45
Page pp.45-53
ISSN 1229-2214
Keywords bi-directional DC-DC converter; PWM switch model; state space averaging; interleaved two-loop control; battery modeling; frequency domain design
Abstract Fuel cell power system is one of the most promising energy source for the alternative energy because it has unique advantages such as high energy density, no power drop during operation, and feasible to make compact size. However, due to very low response time, fuel cell is difficult to correspond to drastic load changes and start-up operation. For solving these problem, fuel cell power system must include energy storage device such as Li-Poly battery or super capacitor. Therefore, bi-directional DC-DC converter must be required for this storage device and fuel cell-PCS control. This paper presents a design and modeling of the bi-directional DC/DC converter. Firstly, we present modeling the boost and buck mode of the bi-directional converter through both PWM switch model and state space averaging technique. Secondly, in order to minimize output ripple and transient response overshoot, we have two identical DC-DC converters interleaved and adopt two-loop voltage-current controller. The proposed bi-directional DC-DC converter’s modeling method and control design have been verified with computer simulation and experimentation.