A perturbed Port-Hamiltonian approach for the stabilization of homogeneous reaction systems via the control of vessel extents

Authors

T. Sang Nguyen, C.K. Tan, N. Ha Hoang, M.A. Hussain, D. Bonvin

Abstract

The paper proposes a tracking-error passivity-based control scheme for the asymptotic stabilization of homogeneous reaction systems. The approach uses the concept of vessel extents in the Port-Hamiltonian (PH) framework. Concretely, the extent-based representation that is obtained by linear time-invariant transformation of the reaction model is expressed as a perturbed PH system, whereby the reaction rates constitute unmatched time-varying disturbances. Two scenarios are considered. The first one assumes that the molar numbers of all species and the reaction temperature are measured and, furthermore, the kinetic model is known, while the second scenario relaxes these assumptions and requires only the measurements of a subset of the molar numbers and of the reactor temperature, but no knowledge of reaction kinetics. For the first scenario, the passivity-based method is used to compensate the disturbances, while preserving the PH structure of the error system via simple matrix factorization of the disturbances. For the second scenario, a constructive procedure is proposed to complete the space of vessel extents with the aim of computing an appropriate damping injection for the closed-loop system. It is shown that the proposed strategies guarantee that the system trajectories converge towards the desired setpoints without the need of state observation. A reaction system exhibiting non-minimum phase behavior is used to illustrate the theoretical developments. The closed-loop performance is discussed and compared to that of a PI controller.

Keywords

chemical reaction, disturbance compensation, port-hamiltonian formulation, tracking-error passivity-based control, vessel extents

Citation

Journal: Computers & Chemical Engineering
Year: 2021
Volume: 154
Issue:
Pages: 107458
Publisher: Elsevier BV
DOI: 10.1016/j.compchemeng.2021.107458

BibTeX

@article{Nguyen_2021,
  title={{A perturbed Port-Hamiltonian approach for the stabilization of homogeneous reaction systems via the control of vessel extents}},
  volume={154},
  ISSN={0098-1354},
  DOI={10.1016/j.compchemeng.2021.107458},
  journal={Computers \&amp; Chemical Engineering},
  publisher={Elsevier BV},
  author={Nguyen, T. Sang and Tan, C.K. and Hoang, N. Ha and Hussain, M.A. and Bonvin, D.},
  year={2021},
  pages={107458}
}

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