Conference article

Deficiencies of Modelica and its simulation environments for large fluid systems

Kilian Link
Siemens AG, Energy Sector, Fossil Power Generation, Energy Solutions, Erlangen, Germany

Haiko Steuer
Siemens AG, Energy Sector, Fossil Power Generation, Energy Solutions, Erlangen, Germany

Axel Butterlin
Siemens AG, Energy Sector, Fossil Power Generation, Energy Solutions, Erlangen, Germany

Download articlehttp://dx.doi.org/10.3384/ecp09430034

Published in: Proceedings of the 7th International Modelica Conference; Como; Italy; 20-22 September 2009

Linköping Electronic Conference Proceedings 43:38, s. 341-344

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Published: 2009-12-29

ISBN: 978-91-7393-513-5

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

Abstract

Modeling of large fluid systems requires in-house (specialized) tools; since applicability of Modelica and existing environments is limited.

Nevertheless Modelica is a very powerful and descriptive modeling language; which is best suited for physical modeling in a heterogeneous environment. Its object oriented approach; the built-in documentation and the availability of commercial and free libraries justifies the decision for Modelica as the preferred modeling language within Siemens Energy.

For an appropriate analysis of transient power plant processes; there often are large fluid systems to be modeled; i.e. there can be several thousand states. For such plant models; we use our in-house tool Dynaplant (DP); which is specialized for large fluid systems. A comparison between DP and Dymola reveals some deficiencie s of the Modelica world concerning performance and plant model construction: Especially; successive initialization and sparse matrix solvers are important features in need.

Keywords

Fluid simulation; workflow; performance

References

[1] Dymola7.1 http://www.dynasim.se/index.htm

[2] Modelica_Fluid: http://www.modelica.org/libraries/Modelica_Fluid

[3] An External Model Interface for Modelica: http://www.modelica.org/events/modelica2008/Proceedings/sessions/session5f.pdf

[4] Modelisar: http://www.itea2.org/public/project_leaflets/MODELISAR_profile_oct-08.pdf

[5] Butterlin; A.; Schiesser; D.; Steuer; H.: Usage of Water & Steam Properties in Computational Intensive Dynamic Simulation; ICPWS XV; September 2008.

[6] Franke; J.; Brückner; J.: Dealing with tube cracking at Herdecke and Hamm-Uentrop in Modern Power Systems; October 2008.

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