ICEPAG2006-24001 MODELING AND CONTROL OF A SOFC-GT HYBRID SYSTEM WITH SINGLE SHAFT CONFIGUR.pdf

1 Copyright ? 2006 by ASME Proceedings of ICEPAG 2006 International Colloquium on Environmentally Preferred Advanced Power Generation September 5-8, 2006, Newport Beach, California ICEPAG2006-24001 MODELING AND CONTROL OF A SOFC-GT HYBRID SYSTEM WITH SINGLE SHAFT CONFIGURATION Rambabu Kandepu1 Rambabu.Kandepu@ntnu.no Lars Imsland2 Lars.Imsland@sintef.no Bjarne Foss1 Bjarne.Foss@ntnu.no 1Norwegian University of Science and Technology (NTNU), Department of Engineering Cybernetics, Trondheim, 7491, Norway 2SINTEF ICT, Trondheim, 7491, Norway ABSTRACT This article focuses on issues related to control and operability of a Solid Oxide Fuel Cell (SOFC) - Gas Turbine (GT) hybrid system with single-shaft GT configuration. The models of all the components of the hybrid system are developed and integrated to constitute the hybrid system. An autonomous power grid is modeled as load. The main control objectives considered are control of Fuel Utilization (FU) in the SOFC and SOFC solid temperature during dynamic operation of the hybrid system. INTRODUCTION In the foreseeable future, fossil fuels including natural gas will be a major source of energy. With today’s increasing concern about global warming and climate change, there is an incentive to investigate natural gas power processes that operate efficiently, thus emitting less per kWh produced, and also power production processes with CO2 capture capabilities. It is widely accepted that fuel cells are power sources that will become increasingly important, due to high efficiency, low levels of pollution and noise, and high reliability. One of the most promising fuel cell technologies is the Solid Oxide Fuel Cell (SOFC), due to its solid state design and internal reforming of gaseous fuels, in addition to its high efficiency [1]. The SOFC converts the chemical energy of a fuel directly to electrical energy. Since SOFCs operate at high temperature