Stability Analysis of Grid-Connected Voltage-Source Converters Using SISO Modeling

Hongyang Zhang, Lennart Harnefors, Xiongfei Wang, Hong Gong, Jean Philippe Hasler

Research output: Contribution to journalJournal articleResearchpeer-review

6 Citations (Scopus)


The interaction of a grid-connected voltage-source converter with a weak grid is of significant interest. In this paper, the converter together with the grid impedance is modeled as a single-input single-output (SISO) system. Provided that certain assumptions hold, this allows us to apply the standard SISO Nyquist stability criterion for stability analysis and controller design. The derived model is verified against time-domain simulations and experiments. The method facilitates the design of the converter control system with adequate stability margins.
Original languageEnglish
Article number8516363
JournalIEEE Transactions on Power Electronics
Issue number8
Pages (from-to)8104-8117
Number of pages14
Publication statusPublished - Aug 2019


  • MIMO communication
  • multi-input multi-output (MIMO)
  • Numerical stability
  • Nyquist stability criterion
  • Phase locked loops
  • Power system stability
  • single-input single-output (SISO)
  • Stability criteria
  • Transfer functions
  • voltage-source converter (VSC)
  • weak grid
  • Multi-input multi-output (MIMO)

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