This paper presents the study of the effect variations in the heat effluence from a solid oxide fuel cell (SOFC) has on a gas turbine hybrid configuration. The SOFC is simulated through hardware at the U.S. Department of Energy, National Energy Technology Laboratory (NETL). The gas turbine, compressor, recuperative heat exchanger, and other balance of plant components are represented by actual hardware in the Hybrid Performance Test Facility at NETL. Fuel cell heat exhaust is represented by a combustor that is activated by a fuel cell model that computes energy release for various sensed system states System structure is derived by means of frequency response data generated by the sinusoidal oscillation of the combustor fuel valve over a range of frequencies covering three orders of magnitude. System delay and order are obtained from Bode plots of the magnitude and phase relationships between input and output parameters. Transfer functions for mass flow, temperature, pressure, and other states of interest are derived as a function of fuel valve flow, representative of fuel cell thermal effluent. The Bode plots can validate existing analytical transfer functions, provide steady state error detection, give a stability margin criterion for the fuel valve input, estimate system bandwidth, identify any nonminimum phase system behavior, pinpoint unstable frequencies, and serve as an element of a piecewise transfer function in the development of an overall transfer function matrix covering all system inputs and outputs of interest. Further loop shaping techniques and state space representation can be applied to this matrix in a multivariate control algorithm.
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August 2009
This article was originally published in
Journal of Fuel Cell Science and Technology
Technical Briefs
Determination of an Empirical Transfer Function of a Solid Oxide Fuel Cell Gas Turbine Hybrid System Via Frequency Response Analysis
Alex Tsai,
Alex Tsai
National Energy Technology Laboratory,
West Virginia University
, Morgantown, WV 26506; Department of Mechanical and Aerospace Engineering, West Virginia University
, Morgantown, WV 26506
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Larry Banta,
Larry Banta
National Energy Technology Laboratory,
West Virginia University
, Morgantown, WV 26506; Department of Mechanical and Aerospace Engineering, West Virginia University
, Morgantown, WV 26506
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Larry Lawson,
Larry Lawson
U.S. Department of Energy,
National Energy Technology Laboratory
, Morgantown, WV 26506
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David Tucker
David Tucker
U.S. Department of Energy,
National Energy Technology Laboratory
, Morgantown, WV 26506
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Alex Tsai
National Energy Technology Laboratory,
West Virginia University
, Morgantown, WV 26506; Department of Mechanical and Aerospace Engineering, West Virginia University
, Morgantown, WV 26506
Larry Banta
National Energy Technology Laboratory,
West Virginia University
, Morgantown, WV 26506; Department of Mechanical and Aerospace Engineering, West Virginia University
, Morgantown, WV 26506
Larry Lawson
U.S. Department of Energy,
National Energy Technology Laboratory
, Morgantown, WV 26506
David Tucker
U.S. Department of Energy,
National Energy Technology Laboratory
, Morgantown, WV 26506J. Fuel Cell Sci. Technol. Aug 2009, 6(3): 034505 (8 pages)
Published Online: May 13, 2009
Article history
Received:
June 18, 2007
Revised:
December 16, 2007
Published:
May 13, 2009
Citation
Tsai, A., Banta, L., Lawson, L., and Tucker, D. (May 13, 2009). "Determination of an Empirical Transfer Function of a Solid Oxide Fuel Cell Gas Turbine Hybrid System Via Frequency Response Analysis." ASME. J. Fuel Cell Sci. Technol. August 2009; 6(3): 034505. https://doi.org/10.1115/1.3006302
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