Identification design for dynamic voltage restorer to mitigate voltage sag based on the elliptical transformation

Peng Li, Yi Wang, Mehdi Savaghebi, Jinghang Lu, Xuewei Pan, Frede Blaabjerg

Research output: Contribution to journalJournal articleResearchpeer-review


In this paper, a new identification tool for dynamic voltage restorer (DVR) is proposed to achieve flexible active and reactive power dispatch during voltage sags. The presented tool entirely relies on the theoretical analysis of the elliptical transformation, and identification marks are determined for different power injections by using one set of digital codes. Besides, two parameters are presented in the accurate mathematical description of the current references, which guarantee continuous power delivery by selecting the proper values. The chief advantages include the smooth transition state during changes in different power deliveries as well as the elimination of active and reactive power oscillations. Then, the characteristics of the identification tool corresponding to the different power dispatch are analyzed to reveal the feasibility of the given current references. Finally, experimental tests utilizing a laboratory prototype are used to verify the flexibility of the proposed control schemes.

Original languageEnglish
JournalIEEE Journal of Emerging and Selected Topics in Power Electronics
Issue number5
Pages (from-to)5672-5686
Publication statusPublished - 1. Oct 2021


  • dynamic voltage restorer
  • elliptical transformation
  • identification tool
  • Oscillators
  • power dispatch
  • Power electronics
  • power quality
  • Power quality
  • Reactive power
  • Tools
  • Trajectory
  • Voltage control
  • Voltage sags
  • Dynamic voltage restorer (DVR)
  • Elliptical transformation
  • Identification tool
  • Power dispatch


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