0
Research Papers

Design, Simulation and Control of a 100 MW-Class Solid Oxide Fuel Cell Gas Turbine Hybrid System

[+] Author and Article Information
Fabian Mueller1

Department of Mechanical and Aerospace Engineering, National Fuel Cell Research Center, University of California, Irvine, Irvine, CA 92697fm@nfcrc.uci.edu

Brian Tarroja

Department of Mechanical and Aerospace Engineering, National Fuel Cell Research Center, University of California, Irvine, Irvine, CA 92697bjt@nfcrc.uci.edu

James Maclay

Department of Mechanical and Aerospace Engineering, National Fuel Cell Research Center, University of California, Irvine, Irvine, CA 92697jdm@nfcrc.uci.edu

Faryar Jabbari

Department of Mechanical and Aerospace Engineering, National Fuel Cell Research Center, University of California, Irvine, Irvine, CA 92697fjabbari@uci.edu

Jacob Brouwer

Department of Mechanical and Aerospace Engineering, National Fuel Cell Research Center, University of California, Irvine, Irvine, CA 92697jb@nfcrc.uci.edu

Scott Samuelsen

Department of Mechanical and Aerospace Engineering, National Fuel Cell Research Center, University of California, Irvine, Irvine, CA 92697gss@uci.edu

1

Corresponding author.

J. Fuel Cell Sci. Technol 7(3), 031007 (Mar 11, 2010) (11 pages) doi:10.1115/1.3207868 History: Received June 26, 2008; Revised January 19, 2009; Published March 11, 2010; Online March 11, 2010

A 100 MW-class planar solid oxide fuel cell synchronous gas turbine hybrid system has been designed, modeled, and controlled. The system is built of 70 functional fuel cell modules, each containing 10 fuel cell stacks, a blower to recirculate depleted cathode air, a depleted fuel oxidizer, and a cathode inlet air recuperator with bypass. The recuperator bypass serves to control the cathode inlet air temperature, while the variable speed cathode blower recirculates air to control the cathode air inlet temperature. This allows for excellent fuel cell thermal management without independent control of the gas turbine, which at this scale will most likely be a synchronous generator. In concept the demonstrated modular design makes it possible to vary the number of cells controlled by each fuel valve, power electronics module, and recirculation blower, so that actuators can adjust to variations in the hundreds of thousands of fuel cells contained within the 100 MW hybrid system for improved control and reliability. In addition, the modular design makes it possible to take individual fuel cell modules offline for maintenance while the overall system continues to operate. Parametric steady-state design analyses conducted on the system reveal that the overall fuel-to-electricity conversion efficiency of the current system increases with increased cathode exhaust recirculation. To evaluate and demonstrate the conceptualized design, the fully integrated system was modeled dynamically in MATLAB-SIMULINK ® . Simple proportional feedback with steady-state feed-forward controls for power tracking, thermal management, and stable gas turbine operation were developed for the system. Simulations of the fully controlled system indicate that the system has a high efficiency over a large range of operating conditions, decent transient load following capability, fuel and ambient temperature disturbance rejection, and the capability to operate with a varying number of fuel cell modules. The efforts here build on prior work and combine the efforts of system design, system operation, component performance characterization, and control to demonstrate hybrid transient capability in large-scale coal synthesis gas-based applications through simulation. Furthermore, the use of a modular fuel cell system design, the use of blower recirculation, and the need for integrated system controls are verified.

FIGURES IN THIS ARTICLE
<>
Copyright © 2010 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Figure 1

Modular fuel cell hybrid system configuration

Grahic Jump Location
Figure 2

System design parametric analysis

Grahic Jump Location
Figure 3

Steady-state system performance (70 fuel cell modules with an ambient temperature of 298 K)

Grahic Jump Location
Figure 4

Impact of the number of fuel modules on system efficiency versus system power

Grahic Jump Location
Figure 5

Fuel cell current/combustor temperature controller

Grahic Jump Location
Figure 6

Fuel cell fuel flow/system power controller with a maximum current governor

Grahic Jump Location
Figure 7

Geometric representation of the evaluation of surge margin

Grahic Jump Location
Figure 8

system bleed surge protection controller

Grahic Jump Location
Figure 9

Supplementary combustor fuel/turbine inlet temperature/gas turbine power cascade controller

Grahic Jump Location
Figure 10

Integrated system controller

Grahic Jump Location
Figure 11

Controlled system simulation of a 2 MW/s 60–170 MW load increase

Grahic Jump Location
Figure 12

Controlled system simulation of a 2 MW/s 170–60 MW load decrease

Grahic Jump Location
Figure 13

Simulated load demand, fuel variation, and ambient temperature diurnal variation

Grahic Jump Location
Figure 14

Controlled system response to the simultaneous load, fuel, and ambient temperature disturbance, as shown in Fig. 1

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In