Modular lumped-parameters dynamic model for gas turbines: Validation and application to a small scale externally fired gas turbine

This paper presents a lumped-parameters modular dynamic model based on physical equations applicable to gas turbine systems. Dynamic simulations performed with the described model are suitable for process and control design purposes. The model is developed using the SimECS (Simulation Toolbox for Energy Conversion Systems) software library currently under development at the Delft University of Technology. The model is validated using reported dynamic trends of operating variables for a commercial aero propulsive turbine. The model of a small scale externally fired gas turbine for biomass conversion is also presented. The effort is part of an envisaged project to realize a prototype in the Netherlands. In the developing market of distributed power generation, the externally fired gas turbine is a promising technology for utilizing biomass in the small to medium power range and especially in cogeneration. One of the crucial issues to be addressed for such systems is its non-steady operation. This can be due both to the changing composition of the fuel source and to the load following operation mode which seems to be the most likely, especially for the,foreseen application in developing countries. Thermal and fluid dynamic response times of the EFGT are widely different and computer simulations can provide a valuable tool to study control and design issues.