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3.2 Operation Modes The normal operation mode is the parallel mode, i.e. the microturbine produces heat and power parallel to the power grid. The local power grid is connected to an outer power grid. If the T100 produces more power than needed in the local power grid, it is exported via the outer grid. If it produces less power, then the remaining power is taken from the outer grid. The owner can decide when and how much power the microturbine should produce depending e.g. on the price of the power from the outer grid. During nights power from the outer grid is cheaper and then the microturbine can be stopped. The other important mode of operation, not yet fully implemented and tested, is the stand-alone mode. This means that the outer power grid has been disconnected due to some reasons, e.g. black-outs, power shortages and technical failures. Then the microturbine has the sole responsibility to produce power to the local power grid. This puts very high demands on speed and reliability. The voltage and frequency needs to be kept constant regardless of the loads on the power grid. In parallel mode, the control system is slow in order to keep the thermal fluctuations in the machine to a minimum. In stand-alone mode there is no possibility to take such precautions since the power output is the primary objective. Figure 7: A flow model of the T100 microturbine, notice the single shaft that is the only rotating part, (Turbec AB) 14PDF Image | Modelling of Microturbine Systems
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