The purpose of the current work is to develop an appropriate control system for a solid oxide fuel cell/gas turbine hybrid system. The main focus lies on the usage of linear control theory for the parameterization of the controller structure. The studies are carried out with a control oriented simplified dynamic model of a hybrid system based on a conceptual design previously presented in literature. As a specific feature additional firing of the gas turbine combustor is used as an extra actuating variable offering several advantages. Foregoing necessary investigations deal with calculating the on- and off-design behavior of the sample system and with defining a reasonable part-load operating curve taking into account several constraints like efficiency, stack temperature, surge margin, etc. Also, preliminary studies of the transient open loop behavior are performed. They reveal that the input variables should be changed with specific care to avoid critical situations during load change. As a precondition for linear control theory a low-order linear model is deduced and validated. With consideration of the transient simulation results and of the properties of the linear model a proper control strategy is suggested, which consists of a proportional output feedback taking into account the multi-input-multi-output character of the system and three distributed proportional-integral controllers that define the requested load point onto the operating curve. Lastly, the controllers are parameterized based on linear control theory and verified.
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June 2010
This article was originally published in
Journal of Fuel Cell Science and Technology
Research Papers
Using Linear Control Theory for Parameterization of a Controller for a SOFC/GT Hybrid Power Plant
Christian Wächter,
Christian Wächter
Power Engineering Laboratory of Turbomachinery, Helmut-Schmidt-University,
e-mail: waechter@hsu-hh.de
University of the Federal Armed Forces Hamburg
, Holstenhofweg 85, D-22043 Hamburg, Germany
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Reinhart Lunderstädt,
Reinhart Lunderstädt
Power Engineering Laboratory of Turbomachinery, Helmut-Schmidt-University,
University of the Federal Armed Forces Hamburg
, Holstenhofweg 85, D-22043 Hamburg, Germany
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Franz Joos
Franz Joos
Power Engineering Laboratory of Turbomachinery, Helmut-Schmidt-University,
e-mail: joos@hsu-hh.de
University of the Federal Armed Forces Hamburg
, Holstenhofweg 85, D-22043 Hamburg, Germany
Search for other works by this author on:
Christian Wächter
Power Engineering Laboratory of Turbomachinery, Helmut-Schmidt-University,
University of the Federal Armed Forces Hamburg
, Holstenhofweg 85, D-22043 Hamburg, Germanye-mail: waechter@hsu-hh.de
Reinhart Lunderstädt
Power Engineering Laboratory of Turbomachinery, Helmut-Schmidt-University,
University of the Federal Armed Forces Hamburg
, Holstenhofweg 85, D-22043 Hamburg, Germany
Franz Joos
Power Engineering Laboratory of Turbomachinery, Helmut-Schmidt-University,
University of the Federal Armed Forces Hamburg
, Holstenhofweg 85, D-22043 Hamburg, Germanye-mail: joos@hsu-hh.de
J. Fuel Cell Sci. Technol. Jun 2010, 7(3): 031003 (9 pages)
Published Online: March 9, 2010
Article history
Received:
June 19, 2008
Revised:
March 21, 2009
Published:
March 9, 2010
Citation
Wächter, C., Lunderstädt, R., and Joos, F. (March 9, 2010). "Using Linear Control Theory for Parameterization of a Controller for a SOFC/GT Hybrid Power Plant." ASME. J. Fuel Cell Sci. Technol. June 2010; 7(3): 031003. https://doi.org/10.1115/1.3206972
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