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As described earlier in the thesis, there are many possibilities for this model. After verification and testing of the model, there are a lot of possible applications: • The model can be used in What-if studies at internal and external dynamic changes, i.e. what happens e.g. with the temperature after the turbine if the load changes or if the temperature of the ambient air is suddenly changed • The model can be used to design control strategies, e.g. when using a brake chopper. • The model can be used to evaluate new developments in the control system for the stand- alone mode, before tried on a real microturbine. Suggestions for future work: • The existing rate limit model does work for discrete time, but in continuous time it can only be used if the source is analytically differentiable, e.g. a sinusoidal or ramp signal. The model should be able to deal with signals that are not directly differentiable, i.e. signals from time tables or if the rate limit model is placed far away from the source. • Developing an operator interface with the LabVIEW program in real time for operator training. • With the LabVIEW application, it can be possible to initiate hardware/software failures, so that service technicians/engineers can learn how the gas turbine behaves with a similar failure. • The bypass function was never fully modelled and should be completed if such interest arises. • The medium models can be changed into models that uses fewer individual substances and instead a constant composition, thus reducing the number of states in the model. With fewer states the simulation time will decrease and the model will be easier to linearize and to use in state-space equations in control design. • The heat exchanger might be modelled with the log-mean temperature method. It might then be possible to reduce the number of discretisations used in the heat exchanger and therefore the number of states in the model. It is however not obvious that the dynamic behavior will not be changed. • Development of a model of the power electronics so that the complete machine can be simulated against a power grid. • With a power electronics model, the complete power plant can be used to design and verify control strategies for power production with several machines connected in parallel. • The model can be linearized and then used in a TOT estimator in the flame-out detection system. • The model can be linearized and put in a state-space form and then used in theoretical control design References 1. Cohen H, Rogers GFC and Saravanamuttoo HIH: “Gas Turbine Theory”. Longman Group Ltd. 4th ed. London, 1996 2. Cengel Y.A and Boles M.A: “Thermodynamics, An Engineering Approach”. WCB/McGraw- Hill 3rd ed. New York, 1998 3. DeWitt D.P and Incropera F.P: “Fundamentals of Heat and Mass Transfer”. Wiley 4th ed. New York, 1996 4. Dynasim AB: “Dymola, Dynamic Modeling Laboratory – User’s Manual”. Dynasim AB Lund, 2001 53PDF Image | Modelling of Microturbine Systems
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