Authors

Jiadong Sun, Xiangyang Xing, Chenghui Zhang

Abstract

Recent years, the virtual synchronous generator (VSG) is widely used in practice, owing to its ability to emulate the behavior of traditional synchronous generators. However, a challenge issue emerges during load changes, namely, the active power oscillation tends to cause overload and frequency stability deterioration, especially in the parallel VSGs system. Although some studies have tried to address this issue, the effectiveness of conventional methods based on small signal model (model linearization) are influenced by the change of equilibrium point. And the linear method of parallel VSGs system is lack of a stable design framework. As the number of VSGs increases, the order of model will increase rapidly, then the stability of parallel system is difficult to be proven by the root locus or other linear stability criteria. Therefore, in this article, the port-controlled Hamiltonian model is first built, which provides a stable framework for control law designing. Then, this model is employed to investigate the impact of coupling effect between parallel VSGs, which induces the oscillation. Furthermore, to mitigate the active power oscillation and enhance the frequency stability, the coupling effect is regarded as the disturbance, and a control law is proposed to constrain the impact of disturbance based on the L2-disturbance attenuation. Finally, effectiveness of the proposed strategy is validated by simulations and experiments.

Citation

  • Journal: IEEE Transactions on Power Electronics
  • Year: 2025
  • Volume: 40
  • Issue: 11
  • Pages: 17295–17308
  • Publisher: Institute of Electrical and Electronics Engineers (IEEE)
  • DOI: 10.1109/tpel.2025.3589731

BibTeX

@article{Sun_2025,
  title={{Modeling, Analysis, and Mitigation of Active Power Oscillation in Parallel VSGs System}},
  volume={40},
  ISSN={1941-0107},
  DOI={10.1109/tpel.2025.3589731},
  number={11},
  journal={IEEE Transactions on Power Electronics},
  publisher={Institute of Electrical and Electronics Engineers (IEEE)},
  author={Sun, Jiadong and Xing, Xiangyang and Zhang, Chenghui},
  year={2025},
  pages={17295--17308}
}

Download the bib file

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