Research Papers

Relative Gain Array Analysis of a Solid Oxide Fuel Cell Gas Turbine Hybrid Plant

[+] Author and Article Information
Alex Tsai, Larry Banta

National Energy Technology Laboratory and Department of Mechanical and Aerospace Engineering, West Virginia University, Morgantown, WV 26505

David Tucker, Randall Gemmen

National Energy Technology Laboratory, West Virginia University, Morgantown, WV 26505

J. Fuel Cell Sci. Technol 7(3), 031004 (Mar 09, 2010) (6 pages) doi:10.1115/1.3206973 History: Received June 22, 2008; Revised October 25, 2008; Published March 09, 2010; Online March 09, 2010

This paper presents a relative gain array (RGA) analysis of a simulated solid oxide fuel cell/gas turbine plant, based on a multivariate empirical formulation of a 300 kW hybrid system. The HyPer test facility at the National Energy Technology Laboratory, served as the test bed for deriving frequency response data and subsequent multivariable model of a direct-fired, recuperated hybrid cycle plant. Through the modulation of various airflow bypass valves, magnitude and phase data are used to formulate transfer function (TF) equations that describe input/output system interaction. A frequency dependent RGA calculation of the empirical TF matrix provides a means of quantifying the degree of coupling between system inputs and outputs for the configuration studied. Various input/output interaction time scales are obtained to identify frequencies where fully developed system coupling occur. Analysis of the RGA matrix leads to a better understanding of the inherent properties and the hybrid configuration, and can serve as a validating tool to existing analytical RGA calculations of similar types of hybrids.

Copyright © 2010 by American Society of Mechanical Engineers
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Grahic Jump Location
Figure 1

NETL HyPer test facility

Grahic Jump Location
Figure 2

Bode magnitude plots: FV

Grahic Jump Location
Figure 3

Bode magnitude plots: CA valve

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Figure 4

Bode magnitude plots: HA valve



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