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Title: Increasing tightness by introduction of intertemporal constraints in MILP unit commitment
Language: English
Authors: Zimmermann, Tobias 
Cors, Tobias 
Erichsen, Gerrit  
Kather, Alfons 
Keywords: mixed integer linear programming; unit commitment; computational efficiency; intertemporal constraints
Issue Date: 2019
Publisher: VDE Verlag
Source: in Schulz, Detlef (Hrsg.) NEIS 2019 Conference on Sustainable Energy Supply and Energy Storage Systems Hamburg, 19 – 20 September 2019. 2019. S. 209-214
Abstract (english): 
Flexibility requirements of controllable units in energy systems increase with high shares of volatile renewable energy (VRE) production. In this work, an existing unit commitment optimisation, formulated as mixed-integer linear problem (MILP) for energy systems is extended with intertemporal constraints to achieve a more realistic and detailed portrayal of the producer park against the backdrop of need for higher flexibilities. Those extensions mainly consider start-up times as well as minimum operating and standstill periods from a technical perspective, which are associated with rising complexity as well as tightness of the MILP. A small-scale energy system designed as a single copper plate with island restrictions, consisting of a conventional power plant, a short-term and a long-term energy storage and a VRE producer park is used to investigate the effects of the integrated intertemporal constraints.
The study shows, that unit commitment is widely influenced by these extensions and the scattering of units, observed in the reference system without these extensions, is eliminated. The number of starts and operating hours therefore results in a more realistic unit commitment. Even though the equation numbers of the MILP increases drastically, the computation time is lowered significantly.
Conference: Conference on Sustainable Energy Supply and Energy Storage Systems (NEIS 2019) 
DOI: 10.15480/882.2544
ISBN: 978-3-8007-5152-5
Institute: Energietechnik M-5 
Document Type: Chapter/Article (Proceedings)
Project: Wärmesektor - Gesamtsystemuntersuchung des Energienetzes bei steigender regenerativer Erzeugung mit Analyse der Sektorkopplung 
VEREKON - Versorgungssicherheit durch Zusammenwirken von regenerativer und konventioneller Stromerzeugung 
License: In Copyright In Copyright
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