VSC Input-Admittance Modeling and Analysis Above the Nyquist Frequency for Passivity-Based Stability Assessment

Lennart Harnefors, Raphael Finger , Xiongfei Wang, Haofeng Bai, Frede Blaabjerg

Research output: Contribution to journalJournal articleResearchpeer-review

72 Citations (Scopus)

Abstract

The interconnection stability of a gridconnected voltage-source converter (VSC) can be assessed via the dissipative properties of its input admittance. In this paper, the modeling of the current control loop is revisited with the aim to improve the accuracy of the input-admittance model above the Nyquist frequency of the converter control system. Particular care is taken in the modeling of the pulsewidth-modulation and sampling processes. It is shown that, in order to eliminate the risk for destabilization of poorly damped grid resonances, dissipativeness of the input admittance is desirable not only for frequencies below, but also above, the Nyquist frequency. Validation is made by simulations and experiments.
Original languageEnglish
JournalI E E E Transactions on Industrial Electronics
Volume64
Issue number8
Pages (from-to)6362 - 6370
Number of pages9
ISSN0278-0046
DOIs
Publication statusPublished - Aug 2017

Keywords

  • Converter control
  • Dissipation
  • Passivity
  • Resonances
  • Stabilization
  • Voltage-source converters

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