Master's Thesis Peter Ullenboom


Analysis of influencing factors on the residual electrical load in distribution grids

The expansion of renewable energies in power generation at the local level will cause increasing
fluctuations in the electricity grid. These fluctuations have to be balanced either at the central or
decentral level. Since at the decentral level there is a significant heating demand for buildings, it
seems promising to combine the electrical and thermal side by using grid-stabilizing heating technologies.
The design of such heating technologies is complex and challenging due to the underlying
uncertainty of the residual electrical load.
In this work the characteristics of the residual electrical load will be analysed. Therefore a variety
of different scenarios for the development of renewable energies in power generation will be investigated
with regard to the resulting fluctuations caused by wind and photovoltaic power generation.
Special attention is paid to the use of photovoltaic systems for power generation since it is of significance
with regards to the low voltage level, at which grid-stabilizing heating technologies see use.
Households and commercial consumers, including non-industrial business, trade and several services
(GHD), will be considered as themain power consuming sectors in a low voltage power grid.
In particular the commercial sector, mainly influencing the residual electrical load by demanding
great electrical loads, is of special interest. By nowthere are no methods of creating generic load profiles
for this sector. Such a method will be developed based on the distribution of the yearly power
demand of different single power consumers.
Based on this method a possible solution for creating a generic residual electrical load will be presented
with respect to the different participants in a low voltage power grid. The characteristic properties
of these are pointed out and the impact of different proportions of photovoltaic power generation
and of the commercial sector power consumption will be analysed.
Within this framework future research should evaluate the possibility of integrating grid-stabilizing
heating technologies.