A Contribution to District Energy Management with Combined Heat and Power Systems



Mehmet Elci
Fraunhofer Institute for Solar Energy Systems ISE
Freiburg, Division Thermal Systems and Buildings, Department Solar Buildings
Phone +49 761 / 4588 5582 – mehmet.elci@ise.fraunhofer.de


Supervision
Prof. Andreas Wagner
Universität Karlsruhe; Karlsruhe Institute of Technology, Department of Architecture


Short discription of the subject

Background and motivation
CHP units are usually thermally driven whereby the heating demand is the only command variable. The electricity is usually fed into the national power grid. This operation regime is often seen as the most economical and ecological option and therefore preferred by most of the CHP unit operators. However, in a wider context this opinion must be reconsidered if the feeding in of electricity from fluctuating renewable energy technologies is to be considered. These feed in the electricity into the national electricity grid in times when sufficient sun and wind is available and not necessarily when there is a demand. Inevitably, at certain times deviations in electricity supply and demand will occur. CHP units in combination with heat storages (inexpensive compared to electricity storages) can contribute to the reduction of these deviations and hence facilitate the integration of renewable energies. Since they can temporally shift the local heating demand due to the heat storages, they can also vary the feeding in of CHP electricity.

Realisation
The focus of this research activity is to investigate alternative methods to the usually utilised Online Model Predictive Control (MPC) for the above mentioned operation regime. The drawbacks of an Online MPC are firstly that the method is not easy for the operators to understand and thus makes a wider application difficult. Secondly, very simplified models are often used for an Online MPC due to the fact that an Online MPC generates high numerical costs during the operation. However, overly simplified models diminish the performance of the operation regime.

Expected results
The aim of this research activity is to find a method which is more suitable compared to an Online MPC for the above mentioned operation regime. The method shall be easier to understand for a wider application and at the same time allow the utilisation of more detailed models. The method shall be evaluated by comparing it with other methods. Due to different scenario calculations, also a contribution to investigate the range of application of the above mentioned operation regime shall be made.


Short CV

Period
Activity
Since 04.2012Research associate (PhD Student); Fraunhofer Institute for Solar Energy Systems ISE, Freiburg; Division Thermal Systems and Buildings Department Solar Buildings
10.2011 – 03.2012Research assistant; Fraunhofer Institute for Solar Energy Systems ISE, Freiburg, Division Thermal Systems and Buildings Department Solar Buildings
10.2010 – 09.2011Master of Science at University of Reading (GB) “Renewable Energy: Technology and Sustainability”
10.2006 – 08.2010Bachelor of Engineering at University of Applied Sciences Biberach „Architectural Engineering“


Focus of interests and research


Publications

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