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Research Papers

Dynamic Modeling of a Reformed Methanol Fuel Cell System Using Empirical Data and Adaptive Neuro-Fuzzy Inference System Models

[+] Author and Article Information
Kristian K. Justesen

e-mail: kju@et.aau.dk

Søren Juhl Andreasen

Associate Professor
e-mail: sja@et.aau.dk

Hamid Reza Shaker

Assistant Professor
e-mail: shr@et.aau.dk
Department of Energy Technology,
Aalborg University,
Aalborg East 9220, Denmark

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF FUEL CELL SCIENCE AND TECHNOLOGY. Manuscript received September 4, 2013; final manuscript received October 17, 2013; published online December 4, 2013. Editor: Nigel M. Sammes.

J. Fuel Cell Sci. Technol 11(2), 021004 (Dec 04, 2013) (8 pages) Paper No: FC-13-1082; doi: 10.1115/1.4025934 History: Received September 04, 2013; Revised October 17, 2013

In this work, a dynamic matlab Simulink model of an H3-350 reformed methanol fuel cell (RMFC) stand-alone battery charger produced by Serenergy® is developed on the basis of theoretical and empirical methods. The advantage of RMFC systems is that they use liquid methanol as a fuel instead of gaseous hydrogen, which is difficult and energy-consuming to store and transport. The models include thermal equilibrium models of the individual components of the system. Models of the heating and cooling of the gas flows between components are also modeled and adaptive neuro-fuzzy inference system models of the reforming process are implemented. Models of the cooling flow of the blowers for the fuel cell and the burner which supplies process heat for the reformer are made. The two blowers have a common exhaust, which means that the two blowers influence each other's output. The models take this into account using an empirical approach. Fin efficiency models for the cooling effect of the air are also developed using empirical methods. A fuel cell model is also implemented based on a standard model, which is adapted to fit the measured performance of the H3-350 module. All of the individual parts of the model are verified and fine-tuned through a series of experiments and are found to have mean absolute errors between 0.4% and 6.4% but typically below 3%. After a comparison between the performance of the combined model and the experimental setup, the model is deemed to be valid for control design and optimization purposes.

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Figures

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Fig. 1

Picture of the integrated H3-350 RMFC stand-alone battery charger developed by Serenergy®

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Fig. 2

Overview of the H3-350, with indication of the modeled temperatures, printed in black, and the directly controllable parameters gathered to the left in the figure, printed in gray

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Fig. 3

Thermal model of the burner and reformer

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Fig. 4

ANFIS model structure used in this work [9]

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Fig. 5

Blower model, PWM to air mass flow

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Fig. 6

Simulated and measured fuel cell voltage with extra model term

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Fig. 7

Screen shot of the model implemented in Matlab Simulink

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Fig. 8

Comparison of the response of the model and the real system to the same change in fuel cell current

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Fig. 9

Illustration of a possible explanation for the drop in temperature observed in the model but not in the experiments

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