Article | Proceedings of the 12th International Modelica Conference, Prague, Czech Republic, May 15-17, 2017 | Discrete-time models for control applications with FMI
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Title:
Discrete-time models for control applications with FMI
Author:
R√ľdiger Franke: ABB AG, Mannheim, Germany Sven Erik Mattsson: Dassault Syst√®mes AB, Lund, Sweden Martin Otter: DLR, Institute of System Dynamics and Control, Germany Karl Wernersson: Dassault Syst√®mes AB, Lund, Sweden Hans Olsson: Dassault Syst√®mes AB, Lund, Sweden Lennart Ochel: Department of Computer and Information Science, Software and Systems, Link√∂ping University, Sweden Torsten Blochwitz: ESI ITI GmbH, Dreseden, Germany
DOI:
10.3384/ecp17132507
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Full text (pdf)
Year:
2017
Conference:
Proceedings of the 12th International Modelica Conference, Prague, Czech Republic, May 15-17, 2017
Issue:
132
Article no.:
057
Pages:
507-515
No. of pages:
9
Publication type:
Abstract and Fulltext
Published:
2017-07-04
ISBN:
978-91-7685-575-1
Series:
Linköping Electronic Conference Proceedings
ISSN (print):
1650-3686
ISSN (online):
1650-3740
Publisher:
Linköping University Electronic Press, Linköpings universitet


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The paper proposes an extension of FMI 2.0 for the rigorous treatment of discrete-time models. This includes the introduction of discrete-time states, the declaration of clocks in the model description and an extension of the calling interface for the external activation of clocks by an importing environment. The synchronous discrete-time extension enables for the first time the synchronization of FMUs with the environment and with other FMUs. It specializes the existing generic event mechanism of FMI 2.0 and maps to synchronous features of Modelica. Discrete-time FMUs are needed for the generation of controller code from functional models. This paper outlines different use cases, including a simple PI controller, feed forward control with a nonlinear inverse model and nonlinear model predictive control. The FMI change proposal FCP-001 and the Modelica change proposal MCP-0024 describe the proposed extensions in more detail. Test implementations exist in the simulation tools Dymola and OpenModelica and in the importing optimization solver HQP. The use cases given in this paper served for further refinement of the change proposals and the test implementations.

Keywords: Modelica Synchonous modeling Inline Integration Model-based Control Nonlinear Inverse Model Feed Forward Control NMPC

Proceedings of the 12th International Modelica Conference, Prague, Czech Republic, May 15-17, 2017

Author:
R√ľdiger Franke, Sven Erik Mattsson, Martin Otter, Karl Wernersson, Hans Olsson, Lennart Ochel, Torsten Blochwitz
Title:
Discrete-time models for control applications with FMI
DOI:
http://dx.doi.org/10.3384/ecp17132507
References:
No references available

Proceedings of the 12th International Modelica Conference, Prague, Czech Republic, May 15-17, 2017

Author:
R√ľdiger Franke, Sven Erik Mattsson, Martin Otter, Karl Wernersson, Hans Olsson, Lennart Ochel, Torsten Blochwitz
Title:
Discrete-time models for control applications with FMI
DOI:
http://dx.doi.org/10.3384/ecp17132507
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