Operating Point Optimization of a Hydrogen Fueled Hybrid Solid Oxide Fuel Cell-Steam Turbine (SOFC-ST) Plant

Juanjo Ugartemendia, J. Xabier Ostolaza and Itziar Zubia
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Juanjo Ugartemendia: Electrical Engineering Department, University of the Basque Country UPV/EHU, Plaza Europa 1, Donostia-San Sebastián 20018, Spain
J. Xabier Ostolaza: Systems Engineering and Control Department, University of the Basque Country UPV/EHU, Plaza Europa 1, Donostia-San Sebastián 20018, Spain
Itziar Zubia: Electrical Engineering Department, University of the Basque Country UPV/EHU, Plaza Europa 1, Donostia-San Sebastián 20018, Spain

Energies, 2013, vol. 6, issue 10, 1-23

Abstract: This paper presents a hydrogen powered hybrid solid oxide fuel cell-steam turbine (SOFC-ST) system and studies its optimal operating conditions. This type of installation can be very appropriate to complement the intermittent generation of renewable energies, such as wind generation. A dynamic model of an alternative hybrid SOFC-ST configuration that is especially suited to work with hydrogen is developed. The proposed system recuperates the waste heat of the high temperature fuel cell, to feed a bottoming cycle (BC) based on a steam turbine (ST). In order to optimize the behavior and performance of the system, a two-level control structure is proposed. Two controllers have been implemented for the stack temperature and fuel utilization factor. An upper supervisor generates optimal set-points in order to reach a maximal hydrogen efficiency. The simulation results obtained show that the proposed system allows one to reach high efficiencies at rated power levels.

Keywords: solid oxide fuel cell (SOFC); hybrid generation; steam turbine; fuel cell; wind generation; gas turbine; bottoming cycle (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2013
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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