Discrete-time port-Hamiltonian systems: A definition based on symplectic integration

Authors

Abstract

We introduce a new definition of discrete-time port-Hamiltonian (PH) systems, which results from structure-preserving discretization of explicit PH systems in time. We discretize the underlying continuous-time Dirac structure with the collocation method and add discrete-time dynamics by the use of symplectic numerical integration schemes. The conservation of a structural discrete-time energy balance – expressed in terms of the discrete-time Dirac structure – extends the notion of symplecticity of geometric integration schemes to open systems. We discuss the energy approximation errors in the context of the presented definition and show that their order for linear PH systems is consistent with the order of the numerical integration scheme. Implicit Gauss–Legendre methods and Lobatto IIIA/IIIB pairs for partitioned systems are examples for integration schemes that are covered by our definition. The statements on the numerical energy errors are illustrated by elementary numerical experiments.

Keywords

dirac structures, discrete-time systems, geometric numerical integration, port-hamiltonian systems, symplectic methods

Citation

Journal: Systems & Control Letters
Year: 2019
Volume: 133
Issue:
Pages: 104530
Publisher: Elsevier BV
DOI: 10.1016/j.sysconle.2019.104530

BibTeX

@article{Kotyczka_2019,
  title={{Discrete-time port-Hamiltonian systems: A definition based on symplectic integration}},
  volume={133},
  ISSN={0167-6911},
  DOI={10.1016/j.sysconle.2019.104530},
  journal={Systems \&amp; Control Letters},
  publisher={Elsevier BV},
  author={Kotyczka, Paul and Lefèvre, Laurent},
  year={2019},
  pages={104530}
}

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