In:
ECS Meeting Abstracts, The Electrochemical Society, Vol. MA2021-03, No. 1 ( 2021-07-23), p. 63-63
Abstract:
Solid Oxide Fuel Cell (SOFC) is an attractive energy conversion device due to its high efficiency and fuel flexibility. Key operation parameters such as current, temperature and fuel utilization are critical variables in SOFC systems that directly impact efficiency and longevity. The degradation of the SOFC performance not only limits the operating temperature range of the SOFC stack in the system, but also simultaneously generates Joule heat, which further causes the stack to deviate from its initial thermal balance. In this paper, a semi-empirical SOFC dynamic model with degradation is proposed and validated by experiment data. The degradation in the above model is developed based on current density, temperature and fuel utilization to simulate cell performance decay over time due to ohmic loss growth and the heat generation by cell resistance. The coupling between key parameters, stack performance and degradation during long-term load following and the impact of stack degradation on the entire system long-term performance is discussed and investigated. An optimized strategy uses both feedback and feed-forward control law is designed to track the desired power demand with the aim of mitigating the degradation and compensating the time differences between dynamics at different time-scale. References 1. Shi W, Zhu J, Han M, et al. Operating limitation and degradation modeling of micro solid oxide fuel cell-combined heat and power system[J]. Applied Energy, 2019, 252: 113444. 2. Zaccaria V, Tucker D, Traverso A, et al. Active Control of Fuel Cell Degradation in an SOFC/GT Hybrid System[C], Turbo Expo: Power for Land, Sea, and Air. American Society of Mechanical Engineers, 2017, 50831: V003T06A035. 3. Murshed A K M M, Huang B, Nandakumar K. Control relevant modeling of planer solid oxide fuel cell system[J]. Journal of Power Sources, 2007, 163(2): 830-845. 4. Das T, Weisman R. A feedback based load shaping strategy for fuel utilization control in sofc systems[C], 2009 American Control Conference. IEEE, 2009: 2767-2772. 5. Spivey B J, Hedengren J D, Edgar T F. Constrained control and optimization of tubular solid oxide fuel cells for extending cell lifetime[C], 2012 American Control Conference (ACC). IEEE, 2012: 1356-1361. 6. Sreedhar I, Agarwal B, Goyal P, et al. An overview of degradation in solid oxide fuel cells-potential clean power sources[J]. Journal of Solid State Electrochemistry, 2020, 24: 1239-1270. Figure 1
Type of Medium:
Online Resource
ISSN:
2151-2043
DOI:
10.1149/MA2021-03163mtgabs
Language:
Unknown
Publisher:
The Electrochemical Society
Publication Date:
2021
detail.hit.zdb_id:
2438749-6
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