Real-World 20-Hz IBR Subsynchronous Oscillations: Signatures and Mechanism Analysis

Lingling Fan, Zhixin Miao, Shahil Shah, Yunzhi Cheng, Jonathan Rose, Shun-Hsien Huang, Bikash Pal, Xiarong Xie, Nilesh Modi, Song Wang, Songzhe Zhu

Research output: Contribution to journalArticlepeer-review

32 Scopus Citations


This article provides analyses of subsynchronous oscillations associated with solar photovoltaics (PVs) observed in real world. All have oscillation frequencies at approximately 20 Hz in voltage and current magnitudes. On the other hand, in phase voltage and current, the oscillations show very different signatures. Through constructing simplified linear models and conducting sensitivity analysis, we are able to associate dynamic phenomena with the underlying mechanism and speculate the possible causes of the 20-Hz oscillations. The analysis results have all been validated via simulation results from electromagnetic transient (EMT) test beds constructed in MATLAB/Simscape.

Original languageAmerican English
Pages (from-to)2863-2873
Number of pages11
JournalIEEE Transactions on Energy Conversion
Issue number4
StatePublished - 2022

Bibliographical note

Publisher Copyright:
© 1986-2012 IEEE.

NREL Publication Number

  • NREL/JA-5D00-82904


  • Inverter-based resources
  • subsynchronous oscillations
  • weak grids


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