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Research Papers

Control Strategies for Start-Up and Part-Load Operation of Solid Oxide Fuel Cell/Gas Turbine Hybrid System

[+] Author and Article Information
Wei Jiang, Ruixian Fang, Jamil Khan

Department of Mechanical Engineering, University of South Carolina, Columbia, SC 29208

Roger Dougal

Department of Electrical Engineering, University of South Carolina, Columbia, SC 29208

J. Fuel Cell Sci. Technol 7(1), 011016 (Nov 11, 2009) (9 pages) doi:10.1115/1.3006197 History: Received June 17, 2007; Revised March 11, 2008; Published November 11, 2009; Online November 11, 2009

Control strategy plays a significant role in ensuring system stability and performance as well as equipment protection for maximum service life. This work is aimed at investigating the control strategies for start-up and part-load operating conditions of the solid oxide fuel cell/gas turbine (SOFC/GT) hybrid system. First, a dynamic SOFC/GT hybrid cycle, based on the thermodynamic modeling of system components, has been successfully developed and simulated in the virtual test bed simulation environment. The one-dimensional tubular SOFC model is based on the electrochemical and thermal modeling, accounting for voltage losses and temperature dynamics. The single cell is discretized using a finite volume method where all the governing equations are solved for each finite volume. Two operating conditions, start-up and part load, are employed to investigate the control strategies of the SOFC/GT hybrid cycle. In particular, start-up control is adopted to ensure the initial rotation speed of a compressor and a turbine for a system-level operation. The control objective for the part-load operation regardless of load changes, as proposed, is to maintain constant fuel utilization and a fairly constant SOFC temperature within a small range by manipulating the fuel mass flow and air mass flow. To this end, the dynamic electrical characteristics such as cell voltage, current density, and temperature under the part load are simulated and analyzed. Several feedback control cycles are designed from the dynamic responses of electrical characteristics. Control cycles combined with control related variables are introduced and discussed.

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Figures

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Figure 1

Heat transfer assumption and element dividing

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Figure 2

Control volume definition for one element

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Figure 3

Gas control volume

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Figure 4

Detailed layout of the SOFC/GT hybrid system in VTB

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Figure 5

Dynamic characteristic of the system after start-up control

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Figure 6

Dynamic characteristic of powers after load resistance change

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Figure 7

Dynamic characteristic of Uf after load resistance change

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Figure 8

Dynamic characteristic of air flow rate after load resistance change

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Figure 9

Dynamic characteristic of the mean temperature of SOFC after load resistance change

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Figure 10

Dynamic characteristic of the air flow rate after load resistance change

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Figure 11

Dynamic characteristic of the system after load resistance change

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