Study of stability after low voltage ride-through caused by phase-locked loop of grid-side converter

Ziqian Zhang*, Robert Schürhuber, Lothar Fickert, Katrin Friedl

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


In a power system with a high percentage of converter coupled generation, dynamic characteristics of the converter affects the stability of the whole power system. The interaction of the various control loops of the grid-side converter, e.g., the phase-locked loop and the DC link voltage control loop, dominates the various dynamic characteristics of the grid-side converter, including its low voltage ride-through ability. In this paper, the phase-locked loop is modeled and analyzed and a stability criterion for the converter, depending on the grid impedance, is obtained. According to this criterion, a common low voltage ride-through test device based on the shunt impedance voltage sag generator is analyzed. The results show that, and explain why, the test device cannot reproduce the characteristics of the practical grid, which is also verified by experiments using a controller-Hardware-in-the-loop system.
Original languageEnglish
Article number106765
Number of pages8
JournalInternational Journal of Electrical Power & Energy Systems
Publication statusPublished - Jul 2021


  • Grid-side converter
  • Phase-locked loop
  • Low voltage ride-through
  • Stability

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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