A fuel-cell stack produces a low and unregulated dc voltage; therefore, a dc-dc converter is required to step up and regulate the output voltage. A major drawback is that the output voltage of the fuel-cell stack exhibits a nonlinear behavior since the output voltage drops when more current is drawn. This output voltage will be later connected to a switch-mode dc-dc converter to step up its value; therefore, it is very important to consider the dynamic behavior of fuel-cell stack as input to a switching converter. In this work, a model is proposed for a combined fuel-cell stack/boost converter system. The interest of this model is clearly motivated by the need to have a model compatible with the standard techniques for controller design as current-mode control. The model is tested using a power module and a boost converter delivering an output power of 740 W. The power module uses polymer electrolyte membrane fuel cells (PEMFCs) and delivers a variable output dc voltage between 24 V to 42 V. Experimental results verify the theoretical results given within.
Modeling Study of a Combined Fuel-Cell Stack/Switch Mode DC-DC Converter
Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF FUEL CELL SCIENCE AND TECHNOLOGY. Manuscript received June 10, 2013; final manuscript received August 5, 2013; published online November 8, 2013. Editor: Nigel M. Sammes.
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Vazquez-Oviedo, E. I., Ortiz-Lopez, M. G., Diaz-Saldierna, L. H., and Leyva-Ramos, J. (November 8, 2013). "Modeling Study of a Combined Fuel-Cell Stack/Switch Mode DC-DC Converter." ASME. J. Fuel Cell Sci. Technol. February 2014; 11(1): 011009. https://doi.org/10.1115/1.4025634
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