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Energies 2013, 6(12), 6413-6422;

Experimental Study on a Passive Fuel Cell/Battery Hybrid Power System

Advanced Institute of Manufacturing with High-Tech Innovation and Department of Mechanical Engineering, National Chung Cheng University, 168, University Rd., Minhsiung Township, Chiayi 62102, Taiwan
Author to whom correspondence should be addressed.
Received: 18 October 2013 / Revised: 22 November 2013 / Accepted: 3 December 2013 / Published: 10 December 2013
(This article belongs to the Special Issue Polymer Electrolyte Membrane Fuel Cells)
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A laboratory-scale passive hybrid power system for transportation applications is constructed and tested in this study. The hybrid power system consists of a fuel cell stack connected with a diode, a lithium-ion battery pack connected with a DC/DC power converter and another diode. The power converter is employed to regulate the output voltage of the battery pack. The dynamic responses of current and voltage of the stack to the start-up and acceleration of the load are experimentally investigated at two different selected output voltages of the DC/DC converter in the battery line. The power sharing of each power source and efficiency are also analyzed and discussed. Experimental results show that the battery can compensate for the shortage of supplied power for the load demand during the start-up and acceleration. The lowest operating voltage of the fuel cell stack is limited by the regulated output voltage of the DC/DC converter. The major power loss in the hybrid power system is attributed to the diodes. The power train efficiency can be improved by lowering the ratio of forward voltage drop of the diode to the operating voltage of the fuel cell stack. View Full-Text
Keywords: hybrid power system; fuel cell; lithium-ion battery; power converter; power train efficiency hybrid power system; fuel cell; lithium-ion battery; power converter; power train efficiency

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Chen, Y.-S.; Lin, S.-M.; Hong, B.-S. Experimental Study on a Passive Fuel Cell/Battery Hybrid Power System. Energies 2013, 6, 6413-6422.

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