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3. Doktoritööd

Selle kollektsiooni püsiv URIhttp://hdl.handle.net/10492/7081

Sirvi

Sirvi 3. Doktoritööd Autor "Allik, Alo" järgi

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    Kirje
    Design of Distributed Energetics Solution Based on the Increasing of Direct Consumption of Electricity Generated from Wind and Solar Energy
    (Eesti Maaülikool, 2016) Allik, Alo; Annuk, Andres (advisor); Karapidakis, Emmanuel S. (opponent)
    This doctoral thesis presents six original papers, which are used to demonstrate the design possibilities for increasing the local renewable energy consumption of buildings equipped with renewable energy production devices. The findings and visualisations can be used for educational purposes as well as for the practical engineering of building based energy systems. The findings from papers can be used to decrease the necessary grid connection capacity of buildings. It was found in the thesis that nominal or high power consumption and production occurs only for a very small fraction of the time. This is evident from the output power data of large wind parks as well as small wind turbines. On the basis of that it was proposed in the thesis that the inverter size of small wind turbines can be reduced significantly, when the pre-inverter energy is utilized for heating purposes. High resolution and quality data is necessary for some the optimization processes. It was found that the data from wind turbine nacelle anemometers is biased by the rotor and therefore empirical correction factors were found during the studies. High resolution measurements enable to apply demand side management in the near future. The demand side management can decrease the standard deviation of the consumption curve which increases the locally consumed renewable energy and decreases the energy exchange with the electrical grid. The application of energy storage and the combination of different energy sources like wind- and solar energy has similar effects. In cases when the self-sufficiency is low, like in buildings with high energy demand (for example in industries), and the supply and demand coincide then there is no need for demand side management. The increase of fR can vary to a big extent dependant on the applied method and the case. The best case showed an increase of up to 36% in the renewable fraction.