Harmonic Stability Assessment for Multi-Paralleled, Grid-Connected Inverters

Changwoo Yoon, Haofeng Bai, Remus Narcis Beres, Xiongfei Wang, Claus Leth Bak, Frede Blaabjerg

Research output: Contribution to journalJournal articleResearchpeer-review

69 Citations (Scopus)


This paper investigates the harmonic interactions of current controllers in multi-paralleled grid-connected inverters. Potential harmonic instability phenomenon, which features oscillations above the fundamental frequency are evaluated by the impedance-based stability criterion. The possible reasons of the destabilized inverter with different types of grid impedances are explained by the passivity based analysis and impedance-based stability criterion. Thereafter, case studies are provided which shows how the non-passive grid connected inverters interact with the varying grid impedance due to load changes or by the new connections of other grid-connected inverters. Time domain simulations in the PSCAD/EMTDC environment and experimental results shows the corresponding harmonic interaction problems may exist in nowadays power system and the impedance-based stability analysis can be an effective tool to assess those problems.
Original languageEnglish
JournalIEEE Transactions on Sustainable Energy
Issue number4
Pages (from-to)1388 - 1397
Number of pages10
Publication statusPublished - Oct 2016


  • Impedance Based Stability Criterion
  • Harmonic Stability
  • Distribution Generation
  • Inverter Output Impedance
  • Grid Impedance
  • Passivity

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