Virtual Inductance for Stable Operation of Grid-Interactive Voltage Source Inverters

Aswad Adib, Behrooz Mirafzal

Research output: Contribution to journalArticlepeer-review

71 Scopus citations

Abstract

In this paper, a feedforward virtual inductance control strategy is developed for the stability of voltage source inverters (VSIs) in weak grids. A weak grid is characterized by a low short-circuit ratio and a low inertia constant, in which VSIs become susceptible to voltage distortions and instability. The proposed feedforward virtual inductance term is integrated into the current control loops of grid-tied VSIs. In this paper, the effectiveness of the virtual inductance control strategy in weak grids is first proved through closed-loop transfer function analysis and then the system's root locus analysis to determine the stability region of the system versus the grid impedance. The developed virtual inductance controller is also verified through laboratory experiments for different weak grid scenarios.

Original languageEnglish
Article number8490849
Pages (from-to)6002-6011
Number of pages10
JournalIEEE Transactions on Industrial Electronics
Volume66
Issue number8
DOIs
StatePublished - Aug 2019
Externally publishedYes

Funding

Manuscript received May 22, 2018; revised August 18, 2018; accepted September 19, 2018. Date of publication October 12, 2018; date of current version March 29, 2019. This work was supported by the National Science Foundation under Grant ECCS-1351665. (Corresponding author: Aswad Adib.) The authors are with the Electrical and Computer Engineering Department, Kansas State University, Manhattan, KS 66506 USA (e-mail:, [email protected]; [email protected]).

Keywords

  • Control of grid-tied inverters
  • LCL filter
  • virtual inductance
  • voltage source inverter (VSI)
  • weak grid

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