Frequency restoration and oscillation damping of distributed VSGs in microgrid with low bandwidth communication

Mengxuan Shi, Xia Chen, Jianyu Zhou, Yin Chen, Jinyu Wen, Haibo He

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)

Abstract

The virtual synchronous generator (VSG) provides a promising way to increase the inertia of inverter-based microgrids. However, when multiple VSGs are parallel in the grid, severe oscillations may be incurred. To address this problem, this article proposes a secondary frequency control for distributed VSGs with low bandwidth communication. The control can damp the oscillations and restore the frequency to the rated value without changing the virtual inertia provided by the VSGs. In addition, the proportional active power sharing is achieved by event-triggered communication mechanism, thereby reducing the communication burden considerably. The stability and Zeno-free behavior of the proposed control strategy are demonstrated by the ultimately uniformly bounded (UUB) theory. Simulations are conducted to verify the effectiveness of the proposed control strategy on the PSCAD/EMTDC platform.
Original languageEnglish
Pages (from-to)1011-1021
Number of pages11
JournalIEEE Transactions on Smart Grid
Volume12
Issue number2
Early online date12 Oct 2020
DOIs
Publication statusPublished - 31 Mar 2021

Keywords

  • oscillators
  • microgrids
  • damping
  • frequency control
  • power system stability
  • synchronous generators
  • decentralized control
  • virtual synchronous generator (VSG)
  • oscillation damping
  • frequency restoration
  • event-triggered mechanism

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