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Research Papers

Control Oriented Analysis of a Hybrid Solid Oxide Fuel Cell and Gas Turbine System

[+] Author and Article Information
Vasilis Tsourapas

Department of Naval Architecture and Marine Engineering, University of Michigan, NAME Building, 2600 Draper Road, Ann Arbor, MI 48109-2145djvas@umich.edu

Jing Sun

Department of Naval Architecture and Marine Engineering, University of Michigan, NAME Building, 2600 Draper Road, Ann Arbor, MI 48109-2145jingsun@umich.edu

Anna Stefanopoulou

Department of Mechanical Engineering, W. E. Lay Automotive Laboratory, University of Michigan, 1231 Beal Avenue, Room 2043, Ann Arbor, MI 48109-2121annastef@umich.edu

Note that Ist=Aci, where Ac is the cell area.

J. Fuel Cell Sci. Technol 6(4), 041008 (Aug 12, 2009) (11 pages) doi:10.1115/1.3081467 History: Received June 15, 2007; Revised August 20, 2008; Published August 12, 2009

The goal of this work is to investigate the feasibility of a hybrid solid oxide fuel cell (SOFC) and gas turbine (GT) system for mobile power production. A system consisting of a gas turbine, a burner, and an SOFC is examined to gain fundamental understanding of the system dynamics. A control oriented dynamic model is developed to provide the critically needed tool for system feasibility analysis and control strategy design. System optimization and transient analysis are performed based on the system model to determine the desired operating conditions and load following limitations. It is shown that the open loop system will shut down in the case of a large load step. Based on the insights learned from the open loop analysis, a feedback control scheme is proposed. The feedback scheme is based on a reference governor, which modifies the load applied to the generator to guarantee stability and fast tracking during transients.

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Copyright © 2009 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Energy flow of integrated fuel cell system with energy recuperation devices

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Figure 2

Schematic of a hybrid SOFC/GT system

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Figure 3

Operating principle of coflow planar SOFCs (1)

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Figure 4

Compressor, turbine, shaft, and generator schematic

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Figure 5

Hybrid SOFC/GT schematic including inputs, controls, state variables, and parameters

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Figure 6

Steady state optimal setpoints (FF map) for current density (i), fuel, and generator load (Pgen) as functions of net load

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Figure 7

System response during a 20–20.5 kW and 20–21 kW step in a Pt−Pc versus N plot

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Figure 8

Equivalent schematic of SOFC/GT system with shaft dynamics separated

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Figure 9

Full order model (FOM) and reduced order model (ROM) shaft speed response to a 3558–3650 W step in Pgend

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Figure 10

Phase portrait of simplified system with state variables Ptc and N

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Figure 11

Step response from 20 kW to 21 kW with various rate limiters on Pgend

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Figure 12

Closed loop schematic with reference governor (RG) control

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Figure 13

Open and closed loop 20–21 kW step response

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