Thermal Dynamic Modeling and Nonlinear Control of a Proton Exchange Membrane Fuel Cell Stack

[+] Author and Article Information
Jason R. Kolodziej

 General Motors, Fuel Cell Activities, 10 Carriage Street, Honeoye Falls, NY 14472jason.kolodziej@gm.com

J. Fuel Cell Sci. Technol 4(3), 255-260 (Jul 14, 2006) (6 pages) doi:10.1115/1.2743070 History: Received July 18, 2005; Revised July 14, 2006

The purpose of this paper is to present a nonlinear control method for accurately maintaining coolant temperature within a proton exchange membrane (PEM) fuel cell stack by controlling coolant flow rate. Due to the current sensitive nature of the membrane and a strict relative humidity requirement it is critical to precisely control the internal temperature of the fuel cell. First, an optimization-based parameter identification is applied to determine unknown coefficients to the nonlinear thermal model of the fuel cell stack. The stack is modeled according to a lumped parameter continuous-flow stirred tank reactor (CSTR) form. The paper then presents a nonlinear disturbance rejection control technique to accomplish the necessary temperature control. Experimental data from a 17-cell fuel cell stack is used for both the modeling and the control portions of this work.

Copyright © 2007 by American Society of Mechanical Engineers
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Figure 1

Fuel cell stack thermal control volume

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Figure 2

Experimental data for effective volume identification

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Figure 3

Effective volume parameter sweep, Vc,eff=0.00075m3

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Figure 4

Model fit of the experimental data, σ=0.5279°C

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Figure 5

Model fit of a complete experimental data set, σ=1.11987°C

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Figure 6

Block diagram illustrating feedback linearization

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Figure 7

Block diagram illustrating the linear plant model

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Figure 8

Block diagram illustrating the closed-loop control system—Feed-forward disturbance rejection with feedback trim

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Figure 9

Nonlinear controller block diagram

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Figure 10

Fuel cell stack load profile

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Figure 11

Fuel cell stack temperature history

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Figure 12

Coolant flow rate (L∕min)




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