An LVRT strategy with quantitative design of virtual impedance for VSG

Yonghui Liu, Yue Wang, Hang Liu, Liansong Xiong, Mingxuan Li, Yang Peng, Zhao Xu, Minghao Wang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

8 Citations (Scopus)


Grid-forming inverters controlled as Virtual Synchronous Generators (VSGs) can provide voltage and frequency support for the power grid, which enhances the stability of the grid. However, VSGs face three challenges under grid voltage sags, i.e., maintaining power angle stability, avoiding overcurrent, and providing reactive power support, while previous virtual impedance-based LVRT strategies for VSGs cannot meet those three requirements simultaneously. In this paper, an LVRT strategy with frozen power loops and quantitatively designed virtual impedance is proposed. By freezing the power loops under grid voltage sags, the power angle stability is maintained. Meanwhile, the virtual impedance is quantitatively designed taking both the tolerable current of the inverter and the reactive power requirement of the grid code into account, which limits the overcurrent and fulfills the requirements of the grid code simultaneously. The experimental results verify that the proposed LVRT strategy not only meets the above three requirements but also makes full use of the maximum output capacity of the inverter during grid voltage sags.

Original languageEnglish
Article number107661
JournalInternational Journal of Electrical Power and Energy Systems
Publication statusPublished - Sept 2022


  • Grid-forming control
  • Low Voltage Ride-Through (LVRT)
  • Virtual impedance
  • Virtual Synchronous Generator (VSG)

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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