S. Nicolay, L. Fritsche, S. Lück, J. Friedrichs, R. Doering

This paper describes the modeling of a fuel cell system, a model-based development of corresponding automation strategies, and an experimental evaluation of the model and automation on a scaled system test rig. The developed system model includes the fuel cell stack and associated peripheral components such as air blowers and valves. The focus of the modeling is laid on transient effects and, in particular, the influences of stack temperature, partial pressures and humidities of the reaction gases on the voltage characteristics of the stacks. The automation strategy developed in the subsequent step includes control of hydrogen pressure, air ratio and coolant temperature using PI controllers. The automation strategy also includes a superordinate state machine for controlling and monitoring the entire system. The automation strategy is evaluated experimentally on two stacks which are electrically interconnected in parallel. The challenge of an unequal current distribution between fuel cell stacks due to different stack performances is also addressed. In order to be able to react to larger load changes and to failure cases, the switching on and off of an entire stack during operation is also investigated and evaluated for the parallel interconnection.

Deutscher Luft- und Raumfahrtkongress 2022, Dresden

Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V., Bonn, 2023

Conference Paper

englisch

21,0 x 29,7 cm, 13 Seiten

urn:nbn:de:101:1-2023071209532284139754

10.25967/570412

fuel cell, hydrogen, aircraft propulsion, electric flight, modeling, control design

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Nicolay, S.; Fritsche, L.; et al. (2023): Development and Evaluation of Strategies for Parallel Operation of Fuel Cell Stacks. Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V.. (Text). https://doi.org/10.25967/570412. urn:nbn:de:101:1-2023071209532284139754.

12.07.2023