Conference article

Production Planning for Distributed District Heating Networks with JModelica.org

Håkan Runvik
Modelon AB, Lund, Sweden

Per-Ola Larsson
Modelon AB, Lund, Sweden

Stéphane Velut
Modelon AB, Lund, Sweden

Jonas Funkquist
Vattenfall R&D, Stockholm, Sweden

Markus Bohlin
SICS Swedish ICT, Kista, Sweden

Andreas Nilsson
SICS Swedish ICT, Kista, Sweden

Sara Modarrez Razavi
SICS Swedish ICT, Kista, Sweden

Download articlehttp://dx.doi.org/10.3384/ecp15118217

Published in: Proceedings of the 11th International Modelica Conference, Versailles, France, September 21-23, 2015

Linköping Electronic Conference Proceedings 118:23, s. 217-223

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Published: 2015-09-18

ISBN: 978-91-7685-955-1

ISSN: 1650-3686 (print), 1650-3740 (online)

Abstract

The short term production planning optimization problem for a district heating system is solved in two steps by integrating physics-based models into the standard approach. In the first step the unit commitment problem (UCP) is solved using mixed integer linear models and standard mixed-integer solvers. In the second step the economic dispatch problem is solved, utilizing the unit statuses from the UCP. This step involves dynamic optimization of non-linear physics-based models. Both optimizations aim at maximizing the production profit. The modeling has focused on distributed consumption and production. Optimization results show that modeling of the district heating net impacts the production planning in several ways, with results such as reduction of production peaks and delay of costly unit start-ups. The physics-based modeling and dynamic optimization techniques provide a flexible way to formulate the optimization problem and include constraints of physically important variables such as supply temperature, pressures and mass flows.

Keywords

district heating; physical modeling; distribution; optimization

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