The Aircraft library is a versatile Modelica library for modeling and simulating aircraft dynamics applications. It is structured into a number of sublibraries, that contain models for describing t ...

1Abstract Recent years have witnessed a significant growth of interest in modeling ,and simulation of

Recent years have witnessed a significant growth of interest in modeling and simulation of engineering application systems. A key factor in this growth has been the development of efficient equatio ...

Abstract In a project between MathCore Engineering and Alstom POWER Sweden in Finspang Sweden, a Modelica model of a complete 43 MW gas turbine has been made. The main purpose of this model is to study transients under different working conditions. The model can be used to optimize start-up sequence, simulate load rejections, verify design, test different fuels etc. A new library called GasTurbine containing components specialized for gas turbine modeling has been developed based on the existing public available ThermoFluid[1, 2] library. 1 Introduction In this paper the modeling issues, using the ThermoFluid library, of a large industrial gas turbine are addressed. The gas turbine is the 43 MW GTX 100 from Alstom POWER in Sweden. This type of gas turbine is used for producing power to an external or internal electrical grid. The main fuel is natural gas or diesel oil. Testing of such big gas turbines in a separate test rig or at each specific site is costly and time consuming. Transient tests might also lead to performance degradation. A detailed dynamic model of a gas turbine could simulate and hereby prevent possible problems before they occur in real life. The ThermoFluid library contains the framework for building thermodynamic applications such as a gas turbine in Modelica. ThermoFluid has also been used in previous projects to build gas turbines[3, 4]. Combined with the Modelica standard library it is possible to connect to other domains such as electrical grid nets, an electrical motor, control systems, etc. Unfortunately the ThermoFluid library is complex to use even for an experienced user, familiar with Modelica. It does not contain the blocks needed to build a complete gas turbine. Therefore an application library called GasTurbine has been made that is more easy to use and contains ready to use components especially designed for gas turbine applications. The current library contains about 100 components. There were mainly two objectives with this project. The first objective was to make an existing model of a reference model made in a static simulation tool called IPSEpro[5]. This tool is a suitable tool for thermodynamic processes in general and it has in Finspang been added a library for gas turbine components. Complete static models of the Finspang gas turbine fleet are frequently used and tuned to correspond to real engine behavior. This kind of static tool is used to e.g. predict power output of a gas turbine at given conditions. The input data could be fuel type, air temperature, ambient pressure, component performance etc. The target for the model in Modelica was to have the steady state points identical to the result from the static model in IPSEpro. This was done step by step by verifying the calculation model and the gas routines for each component in the GasTurbine library. The second objective was to make a simulation of a load rejection where the outlet power to a simulated electrical grid is disconnected instantly and a controller makes sure that the increasing rotational speed will be limited. The controller and the fuel gas system implemented in the Modelica model are built up identical as for the “real” engine.