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Energies 2013, 6(10), 5046-5068; doi:10.3390/en6105046
Article

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

1,* , 2
 and
1
1 Electrical Engineering Department, University of the Basque Country UPV/EHU, Plaza Europa 1, Donostia-San Sebastián 20018, Spain 2 Systems Engineering and Control Department, University of the Basque Country UPV/EHU, Plaza Europa 1, Donostia-San Sebastián 20018, Spain
* Author to whom correspondence should be addressed.
Received: 24 June 2013 / Revised: 10 September 2013 / Accepted: 23 September 2013 / Published: 30 September 2013
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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 solid oxide fuel cell (SOFC); hybrid generation; steam turbine; fuel cell; wind generation; gas turbine; bottoming cycle
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Ugartemendia, J.; Ostolaza, J.X.; Zubia, I. Operating Point Optimization of a Hydrogen Fueled Hybrid Solid Oxide Fuel Cell-Steam Turbine (SOFC-ST) Plant. Energies 2013, 6, 5046-5068.

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