Master's Thesis Konstantin Finkbeiner

 

Integration of renewable energies into the electricity grid using storage capacities of building energy systems

In this work, different steering signals are investigated to control the operation of building energy
systems. Both centralized and decentralized signals are considered and their impact on the stability
of the electrical grid is assessed.
Therefore, a methodology is developed that facilitates the generation of virtual neighborhoods based
on statistical data. Two neighborhoods are generated as an example. The first neighborhood is
located in a southern area and is characterized by a generation of PV. The second neighborhood is
located in a northern area and is characterized by a generation of wind energy.
The price on the EEX spot market in the year 2013 aswell as the total residual load inGermany (2013)
are considered as centralized signals. To take future developments into account both, the residual
load in the year 2030 as well as possible changes of the EEX prices are considered. The local residual
load in the year 2013 is used as a decentralized signal.
The energy system of the virtual neighborhoods is modeled using the simulation software Dymola.
The different steering signals are applied to the two neighborhoods and the transmitted electricity
via a HV/MV-transformer is determined. To evaluate the change of state of the electrical grid the
maximum oscillation of the electrical current through the HV/MV-transformer is considered. Furthermore,
the potentials for improving the energy efficiency of the energy supply are investigated
and whether the buildings heat supply can be guaranteed.
The results show that the decentralized signals are better suited to control the operation of the heating
systems. Thereby, the stability of the electrical grid is improved since both the electricity transfer
and the oscillation of current through the HV/MV-transformer is reduced.Moreover, the energy
efficiency of the heating systems is increased. The heat supply of buildings can not be guaranteed
without a conventional boiler.