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DYNAMIC BEHAVIORAL MODEL OF A PEM FUEL CELL

DYNAMIC BEHAVIORAL MODEL OF A PEM FUEL CELL. - Alexis Kwasinski EE394J-10 Distributed Generation Technologies Final Presentation. Introduction. Goals: - Develop a Dynamic Behavioral Model of a PEM Fuel cell. Characteristics

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DYNAMIC BEHAVIORAL MODEL OF A PEM FUEL CELL

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  1. DYNAMIC BEHAVIORAL MODEL OF A PEM FUEL CELL - Alexis Kwasinski EE394J-10 Distributed Generation Technologies Final Presentation

  2. Introduction • Goals: • - Develop a Dynamic Behavioral Model of • a PEM Fuel cell. • Characteristics • - Model studies the response of the fuel cell when the electrical load changes. • - Model represents the result of the physical process rather than the process itself. • - Simulations are an inexpensive and insightful tool to study complex systems.

  3. Introduction • Literature review: • [1] “Fuel Cell Technology Handbook,” ed. By G. Hoogers, CRC Press LLC, Boca raton , Florida, 2003. • [2] J.C. Amphlet, R. F. Mann, B. A. Peppley, P. R. Roberge, and A. Rodrigues, “A practical PEM fuel cell model for simulating vehicle power sources,” in Proc. Of Tenth Annual Battery Conference on Applications and Advances, pp. 221-226, jan. 1995. • [5] J. T. Pukrushpan, H. Peng and A. G. Stefanopoulou, “Simulation and analysis of transient fuel cell system performance based on a dynamic reactant flow model,” in Proc. 2002 ASME International Mechanical Engineering Congress and Exposition, pp. 1- 12, Nov 2002. • [7] P. Famouri, and R. S. Gemmen, “Electrochemical circuit model of a PEM fuel cell,” in Proc. 2003 IEEE Power Engineering Society General Meeting, vol. 3, pp. 13-17, July 2003.

  4. Physical Model - Equations Ec = Er – vact – vohm – vconc

  5. Physical Model

  6. Behavioral Model - Equations FACT: The time constants of the pump and compressor, are much larger than the time constant of the cathode and anode. -Only system’s dynamic equations: τ is the pump and compressor time constant ~ 1 sec.

  7. Behavioral Model

  8. Simulation Results Simulation: Sudden load increase (2x). Objective V = constant Fuel Cell Current Fuel Cell Output Voltage Output Power

  9. Conclusion • A simple dynamic behavioral model was developed. • The model agrees with known fuel cell behavior. • A sudden load increase leads to: • -Current increases with a time constant of 1 sec. • -Voltage has a sudden drop to 50% value. • -Power has a sudden drop and then increases with • a time constant of 1 sec. • The described behavior indicate potential problems in • automotive and stationary applications. • Solution: use batteries.

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