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Collocation Methods for Optimization in a Modelica Environment

Publiceringsår: 2012
Språk: Engelska
Publikation/Tidskrift/Serie: Proceedings of the 9th International Modelica Conference
Dokumenttyp: Konferensbidrag
Ytterligare information: Key=mag+12mc project=LCCC-modeling, langopt, collocation


The solution of generic dynamic optimization problems described by Modelica, and its extension Optimica, code using direct collocation methods is discussed. We start by providing a description of dynamic optimization problems in general and how to solve them by means of direct collocation. Next, an existing implementation of a collocation algorithm in, using CasADi and IPOPT, is presented. The extensions made to this implementation are reported.

The new implementation is compared to an old C-based collocation algorithm in in two benchmarks. The presented benchmarks are based on a continuously stirred tank reactor and a combined cycle power plant. The new algorithm and its surrounding framework is more flexible and shown to be several times more efficient than its predecessor.



  • Control Engineering
  • dynamic optimization
  • collocation
  • nonlinear programming
  • CasADi


9th International Modelica Conference
Munich, Germany
  • LCCC
  • LCCC

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