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Research Papers

Enhanced Power Generation in SOFCs Using Artificial Limits on Actuator Control Signals

[+] Author and Article Information
Maryam Sadeghi Reineh

Department of Mechanical
and Aerospace Engineering,
University of California, Irvine,
Irvine, CA 92620
e-mail: sadeghm1@uci.edu

Faryar Jabbari

Professor
Department of Mechanical
and Aerospace Engineering,
University of California, Irvine,
Irvine, CA 92620
e-mail: fjabbari@uci.edu

1Corresponding author.

Manuscript received June 30, 2017; final manuscript received April 18, 2018; published online May 28, 2018. Assoc. Editor: Vittorio Verda.

J. Electrochem. En. Conv. Stor. 16(1), 011002 (May 28, 2018) (10 pages) Paper No: JEECS-17-1079; doi: 10.1115/1.4040057 History: Received June 30, 2017; Revised April 18, 2018

In this paper, we study a solid oxide fuel cell (SOFC) controlled by a multi-input multi-output (MIMO) compensator, which uses the blower/fan power and cathode inlet temperature as actuators. The usable power of the fuel cell (FC) is maximized by limiting the air flow rate deliberately when an increase in power is demanded. Possible rate bounds on the cathode inlet temperature are also modeled. These bounds could represent the physical limitations (due to slow dynamics of heat exchangers) and/or a control concept for accommodating the power saving objective. Applying proper limits to the amplitude and rate of the actuator signals, and incorporating antiwindup (AW) techniques, can raise the net power of the FC by 16% with negligible effects on the spatial temperature profile.

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References

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Figures

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Fig. 3

SOFC model and controller block diagram

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Fig. 2

Coflow SOFC control volumes [17]

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Fig. 1

Schematic of a SOFC

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Fig. 4

Power demand profile

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Fig. 11

Effect of different K values on cathode inlet temperature

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Fig. 12

Effect of different K values on anode outlet temperature

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Fig. 5

SOFC model with blower power actuator saturation

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Fig. 6

Blower power with enforced saturation level of 0.4 kW

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Fig. 7

Fuel cell power with enforced saturation level of 0.4 kW on blower power and nominal power demand of 3.5 kW

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Fig. 8

Anode outlet temperature

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Fig. 9

Cathode inlet temperature with and without enforced saturation

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Fig. 10

Rate saturation model

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Fig. 13

SOFC model with cathode inlet temperature rate saturation

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Fig. 14

Effect of rate saturation on cathode inlet temperature

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Fig. 15

Effect of rate saturation on anode outlet temperature

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Fig. 16

SOFC model with blower power magnitude and cathode inlet temperature rate saturation

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Fig. 17

Magnitude and rate antiwindup design schematic

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Fig. 18

Anode outlet temperature for system with optimized net power (with and without AW) and the original system

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Fig. 19

Temperature gradients for system with optimized net power (with and without AW) and the original system

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