Abstract
The paper presents a solution to the problem of large fluctuations of power demand from a fossil-fueled steam turbine cycle. The fluctuations are due to the presence of the renewable energy sources in the power grid. Steams turbines have a minimal load that limits their flexibility, meaning the range of the possible response to the fluctuation in the grid. The solution presented here aims to lower this limit to increase the flexibility. This is achieved by combining a steam turbine cycle with a molten salt storage system. The combined systems allow to store the excessive power and feed the grid with the power output well below the minimal load. Under these conditions a steam turbine becomes much more flexible and is a better fit for the renewables. The paper describes the modifications of existing power generating units required to integrate them with the storage system. The numerical modelling presented in the paper shows the power generation efficiency of the modified cycles for different loads. It also presents the number of hours that the discharging process takes, when the steam for the turbine is generated from the stored energy only.
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