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Research Papers: Gas Turbines: Microturbines and Small Turbomachinery

Fuel Cell/Gas Turbine Hybrid System Control for Daily Load Profile and Ambient Condition Variation

[+] Author and Article Information
Rory A. Roberts, Jack Brouwer

National Fuel Cell Research Center, University of California, Irvine, CA 92697

G. Scott Samuelsen

National Fuel Cell Research Center, University of California, Irvine, CA 92697gss@uci.edu

J. Eng. Gas Turbines Power 132(1), 012302 (Oct 01, 2009) (7 pages) doi:10.1115/1.2833489 History: Received June 16, 2006; Revised September 21, 2007; Published October 01, 2009

Fuel Cell/Gas Turbine (FC/GT) hybrid technology is promising, but introduces challenges in system operation and control. For base-load applications, changes in ambient conditions perturb the system and it becomes difficult to maintain constant power production by the FC/GT system. If the FC/GT hybrid system is load-following, then the problem becomes even more complex. In the current study, a dynamic model of a FC/GT power plant is developed with system controls. Two cases are evaluated: (1) system controls are developed to maintain constant power and process control within acceptable constraints and (2) the FC/GT power plant is set in power following mode connected in parallel to the grid for a daily load profile scenario. Changing ambient conditions are employed in the dynamic analysis for both cases. With appropriate attention to design of the system itself and the control logic, the challenges for dynamic system operation and control can be addressed.

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Figures

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Figure 1

Pressurized SOFC/GT hybrid cycle

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Figure 3

Controller design

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Figure 4

Total power, SOFC power, and gas turbine power produced

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Figure 5

SOFC average temperature, ambient temperature, and bypassed mass flow

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Figure 6

Compressor mass flow, pressure, and normalized shaft speed

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Figure 7

SOFC, cathode, turbine inlet temperature, and the catalytic oxidizer temperature

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Figure 8

System efficiency, SOFC oxygen and fuel utilization, and fuel flow

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Figure 9

Total power, SOFC power, and gas turbine power produced

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Figure 10

SOFC average temperature, ambient temperature, and bypassed mass flow

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Figure 11

Compressor mass flow, pressure, and normalized shaft speed

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Figure 12

SOFC, cathode, turbine inlet temperature, and the catalytic oxidizer temperature

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Figure 13

System efficiency, SOFC oxygen and fuel utilization, and fuel flow

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