Modelling of Microturbine Systems

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Modelling of Microturbine Systems ( modelling-microturbine-systems )

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Figure 25: The complete model In the figure above, the complete model is presented. Green lines represent flows, like air, fuel and water. Blue lines represent signals to and from the control system. Extra arrows have been included to show the general direction of the gas flow. Fresh air comes from the air source in the upper left corner, passes the compressor, and enters the recuperator. After the recuperator, there is an extra heat exchanger to model the heat storage in the turbine rotor and diffuser. The air continues into the combustion chamber, where it is mixed with the fuel and burned at a constant pressure. The exhaust gas enters the turbine, the extra heat exchanger, the recuperator and finally the gas/water heat exchanger. In the end, the exhaust gas exits the microturbine system into a reservoir. The small white block on the right side of the turbine is the flange, to which the generator is connected. The generator does not have a separate model block, since it is only the mechanical work that the generator consumes that is modelled. The work and the corresponding torque are added on the single shaft via this flange. Between the compressor block and the turbine block, there is an inertia model of the single shaft. The circular blocks with hands are sensors. In the upper part of the figure a speed sensor can be seen, which delivers the speed measurement to the 44

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Modelling of Microturbine Systems

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