Research Papers

Modeling, Control, and Integration of a Portable Solid Oxide Fuel Cell System

[+] Author and Article Information
Puran Adhikari

Department of Electrical and Computer Engineering,  Tennessee Tech University, Cookeville, TN 38505 padhikari42@students.tntech.edu

Mohamed Abdelrahman

Associate Dean and Professor Electrical Engineering and Computer Science,  Texas A&M University-Kingsville, Kingsville, TX 78363 mabdelrahman@tamuk.edu

J. Fuel Cell Sci. Technol 9(1), 011010 (Dec 22, 2011) (14 pages) doi:10.1115/1.4005386 History: Received March 13, 2011; Revised July 24, 2011; Published December 22, 2011; Online December 22, 2011

A novel method for the control and integration of a portable hybrid solid oxide fuel cell (SOFC) system, based on hydrocarbon fuel, is presented in this paper. The balance of plant (BOP) and power electronics systems are treated as separate local units, and local controllers are designed for each unit using established linear techniques. For the control of the integration of these two systems, a higher level supervisory controller is developed. The supervisory controller is an intelligent controller that decides how each of the local controllers should perform based on the status of the respective local units. Two energy buffer units (battery and super-capacitor) have been used for the mitigation of load transients. The supervisory controller is developed using state-flow and fuzzy logic toolbox of Matlab . All the modeling and control is implemented in a Matlab /Simulink environment.

Copyright © 2012 by American Society of Mechanical Engineers
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Figure 1

Full system overview of the portable SOFC system

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Figure 2

Input/output species in CPOX reformer

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Figure 3

Input/output species of tail gas combustor

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Figure 4

Non interacting decoupled control structure

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Figure 5

(a) Subtraction block between demand and actual fuel cell power. (b) Subtraction block between actual and available power of fuel cell.

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Figure 6

Temperature control through air flow rate control

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Figure 7

Controller configuration for splitter opening

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Figure 8

Simulink model of BOP model and controller

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Figure 9

Three input bidirectional DC/DC converter topology

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Figure 10

(a) Boost converter during switch on period. (b) Boost converter during switch off period.

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Figure 18

Power levels of different sources and load during step increase in load

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Figure 19

Regulated DC link output voltage of the DC/DC converter

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Figure 20

Fuel utilization curve

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Figure 21

Stack temperature response

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Figure 22

Tail gas combustor temperature response

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Figure 17

Temperature response versus time for different step changes in H2 reference

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Figure 16

H2 output versus time for different step changes in H2 reference

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Figure 15

Power sharing in the transient mode of operation

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Figure 13

Finite state machine model of the supervisory controller

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Figure 12

Bode diagram for inductor current to duty cycle transfer function

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Figure 11

Bode diagram for output voltage to duty cycle transfer function

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Figure 14

Fuzzy logic controller to generate reference for battery power



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