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2. Hybrid fuel cell power modules in more- and all-electric aircraft

Author

Kallo, Josef, Flade, Steffen, Stephan, Thomas, Busemeyer, Lucas, Ehrhardt, Henry, Thalau, Oliver, Burberg, Torben, Preiß, Gunnar, Werner, Claudia, Becker, Florian, Pillath, Florian, and Schirmer, Johannes

Subjects
AEA, MOA, elektrisches fliegen, Brennstoffzelle, Hybrid, HY4
Published
2016

3. Fuel cell and Li-ion battery direct hybridization system for aircraft applications

Author

Kallo, Josef, Garrot, Olivier, WeissUngethum, Jorg, and Nishizawa, Akira

Subjects
Battery (electricity), Engineering, Renewable Energy, Sustainability and the Environment, business.industry, Fuel cell, Electrical engineering, Energy Engineering and Power Technology, Battery pack, DC motor, Hybrid system, Stack (abstract data type), Electric airplane, Li-ion battery, Automotive battery, Electrical and Electronic Engineering, Physical and Theoretical Chemistry, business, Diode, Voltage
Abstract

The concept of a passive hybrid system consisting of fuel cell stacks, Li-ion battery packs, and two diodes was tested. The diodes take the place of the DC/DC converter that is usually used to align fuel cell and battery voltages, thereby directly connecting the fuel cell and the battery. Prototype equipment was built for collecting characteristic data on the static and dynamic behavior of the hybrid system. The measurement results indicate that increasing the operation efficiency and simplifying the system were possible by applying the direct hybridization concept. The dynamic behavior results showed an interesting combination of output signals from the fuel cell stack and the battery pack. The quick response of the battery output completely compensated for the delay in fuel cell output response, indicating that the direct hybrid system is also applicable to high-frequency electric loads such as brushless DC motors. The ability to recharge without a DC/DC converter was also successfully validated for the direct hybrid system. From the measurement results, the design method, and the system sizing, this passive hybrid system appears promising for application in the Antares DLR-H2 electric aircraft test bed.

Published
2013

8. Pressurized SOFC for the integration in a hybrid power plant

Author

Tomaszewski, Amrei, Willich, Caroline, Henke, Moritz, Klein, Miriam, Kallo, Josef, and Friedrich, K. Andreas

Subjects
Solid oxide fuel cell, Electrochemical Impedance Spectroscopy (EIS), Reforming, hybrid power plant
Published
2013

10. Pressurized Solid Oxide Fuel Cells

Author

Kallo, Josef, Henke, Moritz, Willich, Caroline, Westner, Christina, Leucht, Florian, Bessler, Wolfgang G., and Friedrich, K. Andreas

Subjects
pressure, SOFC
Published
2012

19. DLR SOFC/GT Hybrid Test Facilities

Author

Leucht, Florian, Seidler, Stephanie, Henke, Moritz, Bessler, Wolfgang G., Kallo, Josef, and Friedrich, K. Andreas

Subjects
Überblick, Hybridkraftwerk, Druckaufgeladene SOFC
Published
2010

21. Up, up and away

Author

Müller-Steinhagen, Hans, Kallo, Josef, and Friedrich, K. Andreas

Subjects
multifunctional fuel cell system, Antares DLR-H2, GPU, APU, PEM, Fuel cells, PEFC
Published
2010

27. Electric Flight

Author

Kallo, Josef

Subjects
AEA, MEA, Electric Flight, HY4

28. Electric flight concepts

Author

Flade, Steffen, Tomazic, Tine, Stephan, Thomas, Schirmer, Johannes, and Kallo, Josef

Subjects
AEA, MEA, Electric Flight, HY4

29. Fliegen mit Wasserstoff

Author

Schirmer, Johannes, Flade, Steffen, Stephan, Thomas, and Kallo, Josef

Subjects
AEA, MEA, Electric Flight, HY4

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