A Scalable Port-Hamiltonian Approach to Plug-and-Play Voltage Stabilization in DC Microgrids

Authors

Felix Strehle, Martin Pfeifer, Albertus Johannes Malan, Stefan Krebs, Soren Hohmann

Abstract

One of the major challenges of voltage stabilization in converter-based DC microgrids are the multiple interacting units displaying intermittent supply behavior. In this paper, we address this by a decentralized scalable, plug-and-play voltage controller for voltage-source converters (VSCs) at primary level. In contrast to existing approaches, we follow a systematic and constructive design based on port-Hamiltonian systems (PHSs) which does neither require the heuristic proposition of a Lyapunov function nor the computation of auxilliary variables such as time-derivatives. By employing the Hamiltonian naturally obtained from the PHS approach as Lyapunov function and using the modularity of passive systems, we provide sufficient conditions under which the designed VSC controllers achieve microgrid-wide asymptotic voltage stability. Integral action (IA), which preserves the passive PHS structure, robustifies the design against unknown disturbances and ensures zero voltage errors in the steady-state. Numerical simulations illustrate the functionality of the proposed voltage controller.

Citation

• Journal: 2020 IEEE Conference on Control Technology and Applications (CCTA)
• Year: 2020
• Volume:
• Issue:
• Pages: 787–794
• Publisher: IEEE
• DOI: 10.1109/ccta41146.2020.9206323

BibTeX

@inproceedings{Strehle_2020,
  title={{A Scalable Port-Hamiltonian Approach to Plug-and-Play Voltage Stabilization in DC Microgrids}},
  DOI={10.1109/ccta41146.2020.9206323},
  booktitle={{2020 IEEE Conference on Control Technology and Applications (CCTA)}},
  publisher={IEEE},
  author={Strehle, Felix and Pfeifer, Martin and Malan, Albertus Johannes and Krebs, Stefan and Hohmann, Soren},
  year={2020},
  pages={787--794}
}

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