Analysis and Design of Bi-directional DC-DC Converter in Extended Run Time DC UPS System Based on Fuel Cell and Supercapacitor

Zhe Zhang, Ole C. Thomsen, Michael A. E. Andersen, Jacob D. Schmidt, Henning R. Nielsen
2009 2009 Twenty-Fourth Annual IEEE Applied Power Electronics Conference and Exposition  
In this paper, an extended run time DC UPS system structure with fuel cell and supercapacitor is investigated. A wide input range bi-directional dc-dc converter is described along with the phase-shift modulation scheme and phase-shift with duty cycle control, in different modes. The delivered power and peak current are analyzed and calculated. The key parameters of the bi-directional dc-dc converter, the relationships between the input voltage, phase-shift angle, ratio of the transformer and
more » ... kage inductance are analyzed and optimized. Build the system mathematic model and a novel input voltage combined with load current feedback using PI controller with anti-windup scheme to realize closed-loop control of the whole system, and verify the feasibility of the control scheme proposed by simulation. A 1kW prototype controlled by TMS320F2808 DSP is implemented and tested. Experimental results show the validity of design.
doi:10.1109/apec.2009.4802739 fatcat:vhpu6ysl6bd3dbpb66bbkp6soi