Control structure design of a solid oxide fuel cell and a molten carbonate fuel cell integrated system: Top-down analysis

Jienkulsawad, Prathak; Skogestad, Sigurd; Arpornwichanop, Amornchai

doi:10.1016/j.enconman.2017.09.033

Cited by 8 publications

(7 citation statements)

References 28 publications

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“…According to the static calculation, the temperature constraint, T fc ≤ 1100 K, is always active at the upper bound. This result coincides with the situation in which T fc is a typical CV in many open studies. ,,− …”

Section: Sofc Processsupporting

confidence: 88%

“…It is understandable that the effect of power control is not good because the current density varies greatly. Jienkulsawad et al, 17 Taghizadeh et al 43 31.77 122.08…”

Section: Evaluation Of Classical Control Strategiesmentioning

confidence: 99%

“…V fc Hajimolana and Soroush, 32 Sendjaja and Kariwala, 44 de Avila Ferreira et al 45 89.99 246.37 17 Sendjaja and Kariwala, 44 Arpino et al 46 104.86 395.09 λ air Aguiar et al, 12 Zhang et al 30 253.25 1179.82 P w Larosa et al, 47 as the CV has many cases of no solution when the current density deviates greatly from the nominal value. It implies that methane is not a good choice for a controlled variable.…”

Section: Evaluation Of Classical Control Strategiesmentioning

confidence: 99%

“…Barelli et al 16 used a general regression law to maintain a constant stack temperature by regulating the air flow under varying load and fuel composition. Jienkulsawad et al 17 studied the SOFC integrated with a molten carbonate fuel cell. Different active constraints and control variables (CVs) were identified in different interference regions to ensure safe operation and economic optimization.…”

Section: Introductionmentioning

confidence: 99%

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Efficiency Maximization of a Direct Internal Reforming Solid Oxide Fuel Cell in a Two-Layer Self-Optimizing Control Structure

Shen

et al. 2023

ACS Omega

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Control system configuration is essential for the efficiency performance of a solid oxide fuel cell (SOFC). In this paper, we aim to report a novel two-layer self-optimizing control (SOC) system for the efficiency maximization of a direct internal reforming SOFC, where the efficiency index is defined as the profit of generated electricity penalized by carbon (CO 2 ) emission. Based on the lumped-parameter model of the SOFC, comprehensive evaluations are carried out to identify the optimal controlled variables (CVs), the control of which at constant set-points can optimize the efficiency, in spite of operating condition changes. In the lower SOC layer, we configure single variables as the CVs. The results show that the stack temperature is the active constraint which should be controlled to maintain the cell performance. In addition, the outlet hydrogen composition is identified as the optimal CV. This result differs from several previous proposals, such as methane composition. In the presence of operating condition changes, the set-point of hydrogen composition is further automatically adjusted by the upper SOC layer, where a linear combination of the SOFC measurements is configured as the CV, giving negligible efficiency losses. The cascaded two-layer SOC structure is able to maximize the SOFC efficiency and reduce carbon emission without using online optimization techniques; meanwhile, it allows for smooth and safe operations. The validity of the new scheme is verified through both static and dynamic evaluations.

show abstract

Section: Sofc Processsupporting

confidence: 88%

“…It is understandable that the effect of power control is not good because the current density varies greatly. Jienkulsawad et al, 17 Taghizadeh et al 43 31.77 122.08…”

Section: Evaluation Of Classical Control Strategiesmentioning

confidence: 99%

Section: Evaluation Of Classical Control Strategiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Efficiency Maximization of a Direct Internal Reforming Solid Oxide Fuel Cell in a Two-Layer Self-Optimizing Control Structure

Shen

et al. 2023

ACS Omega

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show abstract

“…The systematic CSD method by Skogestad [ 13 ] is based on the SOC principle. Currently, it is one of the most widely spread design methods, and has been successfully applied to a number of plant-wide chemical processes, for example [ [35] , [36] , [37] , [38] , [39] , [40] ], to list a few. The procedure is briefly illustrated as follows [ 13 ]: Top-down analysis: selection of primary CVs: Define the operational target for the whole process; Analyze degrees of freedom; Select the primary CVs (elaborated in Section 2.2 ); Production rate setting; Bottom-up design: Design regulatory control layers which serves to, stabilize the process, reject local disturbances, select secondary CVs and pair the system inputs and outputs; design supervisory control layers: determine centralized or distributed control, etc.…”

Section: The Systematical Csd Proceduresmentioning

confidence: 99%

Enhanced control structure design for an industrial off-gas system: Simple reconfigurations benefit the economy

Shen

Guan

et al. 2023

Heliyon

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Introduction

Bavafa-Toosi¹

2019

Introduction to Linear Control Systems

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Control structure design of a solid oxide fuel cell and a molten carbonate fuel cell integrated system: Top-down analysis

Cited by 8 publications

References 28 publications

Efficiency Maximization of a Direct Internal Reforming Solid Oxide Fuel Cell in a Two-Layer Self-Optimizing Control Structure

Efficiency Maximization of a Direct Internal Reforming Solid Oxide Fuel Cell in a Two-Layer Self-Optimizing Control Structure

Enhanced control structure design for an industrial off-gas system: Simple reconfigurations benefit the economy

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