Methodology for the control strategy for a solid oxide fuel cell hybrid system

Based on mathematical modeling and numerical simulations, the control strategy for a Solid Oxide Fuel Cell Hybrid System (SOFC-HS) is presented. Adequate maps of performances with three independent parameters are shown. The independent parameters are as follows: stack current, fuel mass flow and turbine-compressor shaft speed. Those parameters can be controlled by external load, fuel valve and turbine-compressor shaft speed, respectively. The control system is purposed to meet many constraints: e.g. stack temperature, steam-to-carbon ratio, compressor surge limitation etc. The aim is to achieve maximum efficiency of power generated within those constraints. Governing equations of SOFC-HS modeling are given. An adequate simulator for the SOFC module was produced and described. Based on this simulator, the control strategy was obtained. The performance of this SOFC-HS is shown in various working environments.

[1]  Christoph Stiller,et al.  Design, Operation and Control Modelling of SOFC/GT Hybrid Systems , 2006 .

[2]  Lars Imsland,et al.  Control strategy for a solid oxide fuel cell and gas turbine hybrid system , 2006 .

[3]  H. Ho,et al.  Multi-level modeling of SOFC–gas turbine hybrid system , 2003 .

[4]  Jarosław Milewski,et al.  Influences of The Type and Thickness of Electrolyte on Solid Oxide Fuel Cell Hybrid System Performance , 2006 .

[5]  Christoph Stiller,et al.  Safe Dynamic Operation of a Simple SOFC/GT Hybrid System , 2006 .

[6]  Shinji Kimijima,et al.  PERFORMANCE EVALUATION OF GAS TURBINE-FUEL CELL HYBRID MICRO GENERATION SYSTEM , 2002 .

[7]  Jarosław Milewski,et al.  Off-design analysis of SOFC hybrid system , 2007 .

[8]  A. Virkar,et al.  Dependence of polarization in anode-supported solid oxide fuel cells on various cell parameters , 2005 .

[9]  A. Virkar,et al.  Fuel Composition and Diluent Effect on Gas Transport and Performance of Anode-Supported SOFCs , 2003 .

[10]  H. Ho,et al.  Modelling of simple hybrid solid oxide fuel cell and gas turbine power plant , 2002 .

[11]  B. Thorstensen.  A parametric study of fuel cell system efficiency under full and part load operation , 2001 .

[12]  Azra Selimovic,et al.  Design and Off-Design Predictions of a Combined SOFC and Gas Turbine System , 2001 .

[13]  Loredana Magistri,et al.  Ejector performance influence on a solid oxide fuel cell anodic recirculation system , 2004 .

[14]  François Maréchal,et al.  Process flow model of solid oxide fuel cell system supplied with sewage biogas , 2004 .

[15]  Joshua E. Freeh,et al.  Off-Design Performance Analysis of a Solid-Oxide Fuel Cell/Gas Turbine Hybrid for Auxiliary Aerospace Power , 2005 .

[16]  Aristide F. Massardo,et al.  Design and part-load performance of a hybrid system based on a solid oxide fuel cell reactor and a micro gas turbine , 2001 .