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and connections is used in simulations to get static results with high accuracy. The model has then been verified with experimental data and calibrated to further improve the model’s accuracy. Matlab/Simulink is used to model the power electronics and control system including a coarse thermodynamic model. The problem with Matlab/Simulink is that the program does not model flows well in general and flows in sudden changing directions in particular. Matlab/Simulink supports causal modelling with fixed causality of inputs and outputs and hard work is needed to put the system in the order of an ordinary differential equation (ODE). The modelling is also not component-oriented. More discussions can be found in the Modelica chapter. A third program, ICES, (Internal Combustion Engine Simulation), is used to create a dynamic model of the microturbine engine. The program is written in Fortran and is component-oriented. The drawback is that Fortran does not have a graphical user interface, which makes it harder to learn. Most models are however written in Fortran and it is the most widely used modelling language in the industry. The very useful library ThermoFluid is also a major incitement to choose Modelica as the modelling language. Fortran does have a similar library for thermodynamic models but in other areas as e.g. electronics Modelica is better situated than Fortran. Models in Modelica can also be transferred to other simulation environments as S-functions in Matlab/Simulink, which ICES cannot. It is possible to execute Fortran and C code in Matlab but to integrate the model with other Simulink models you need to convert the code into S-functions. In total this lead us to choose Modelica as our choice of modelling language with ThermoFluid as a prime resource for the basic blocks. In choosing Modelica we also chose Dymola as our simulation program since those two are closely linked. The company behind Dymola, Dynasim AB is also very active in the development of Modelica as the new language of modelling. After this initial discussion I will describe the different simulation tools used in this thesis. 4.2 Dymola Dymola, Dynamic Modeling Laboratory, is a simulation program consisting of a compiler, graphical user interface, numerical solvers and plot functions. For more information on Dymola, see the Dymola manual (2001) or their home page www.dynasim.se. The models are written in the Modelica language. Dymola generates the C code, which is compiled and linked with the solver routines into a simulation executable, Dymosim. In the Dymola Main Window parameters, initial conditions and simulation settings can be set. 16PDF Image | Modelling of Microturbine Systems
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