A less-intrusive approach to stabilize VSC transmission against highly variable grid strength

Z. Zhang, D. Chen*, K. Givaki, L. Xu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)
99 Downloads (Pure)

Abstract

A less-intrusive solution to stabilize a voltage source converter (VSC) over an unknown grid strength is presented in this article. The existence of equilibrium point is investigated as a prerequisite to stabilization. By partially imposing grid forming control, a simple auxiliary outer loop is proposed to exhaust the physical limit of power delivery in steady state and provide support to fault-ride-through (FRT) operations over a wide range of grid strength. The proposed control can be used to upgrade a commissioned VSC with inner current loop intact and overcome the impact of negative voltage sensitivity; it also offers a robust nonintrusive solution to stabilize VSCs externally. The effectiveness of the proposed schemes is verified by analysis in frequency domain and simulations in electromagnetic transient (EMT) time domain considering change of grid strength and FRT.
Original languageEnglish
Pages (from-to)7199-7211
Number of pages13
JournalIEEE Journal of Emerging and Selected Topics in Power Electronics
Volume9
Issue number6
DOIs
Publication statusPublished - 12 Oct 2020

Keywords

  • voltage source converter
  • grid strength
  • voltage stability
  • voltage sensitivity
  • stabilization
  • fault-ride-through
  • partial grid-forming
  • weak grids
  • damping

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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