Master's Thesis Gero Syrée


Opportunities for the economically efficient integration of decentral energy conversion systems supplemented by thermal storages

Within the proceeding decentralization of the electrical energy supply system in the past few years
– with a sharply increasing amount of small scaled and fluctuating renewable energy unit installations
– appropriate countermeasures need to be introduced in the energy market in order to ensure
grid stability and keep electricity affordable.
This thesis outlines and evaluates possible alternatives on the decentralized supply level with regard
to the grid stability. As a control signal, residual load profiles are used to influence the operation of
the decentral supply units in order to ensure grid stability. The predominant focus is set on the decentral
integration of flexible and efficient energy supply systems like small scaled combined heat
and power plants or electrical heat pumps which are supplemented by a thermal storage system.
The aim of the thesis is to determine the minimum/ maximumelectricity price for the sold/ bought
electricity. The economic analysis is conducted with regard to a reference system comprised of a
single boiler unit. In case of CHP units, the determined electricity price is the minimumprice which
needs to be at least received. In case of heat pumps and electrical heating elements, the electricity
price is the maximum payable price. To determine these prices for different residual load scenarios
and heat consumption profiles, dynamic simulations in Modelica/Dymola over a time period
of 20 years are conducted. Thereby, the residual load profiles determine operation boundaries for
the examined decentral supply systems. This results in electricity prices for the corresponding configurations
with regard to grid stabilizing operation. By comparing these prices, the economically
most profitable technology installation for a certain consumption and residual load profile is determined.