Analysis of potential low frequency resonance between a 1GW MMC HVDC and a nearby nuclear generator

Stefan Kovacevic* (Corresponding Author), Dragan Jovcic, Sumeet S. Aphale, Pierre Rault, Olivier Despouys

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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This paper presents a comprehensive analytical eigenvalue stability study of subsynchronous torsional interactions between the 1 GW Eleclink MMC HVDC and the 1.12 GW Gravelines turbine-generator in north France. It revalidates the conclusions of previous studies on VSC-based HVDC systems by showing that the risk of SSTI may be of significance when the HVDC is based on the MMC and not the two level VSC technology. The study demonstrates that in the case of the weak French grid and the rated HVDC power flow from France to England, the HVDC can destabilize the dominant low frequency, 6.3 Hz, torsional mode. The analysis also expands the work of previous studies on MMC and reveals that the case of the HVDC power flow from the English to the French grid may also introduce the risk of destabilizing the lower frequency mode. Furthermore, it also reveals a noticeable impact of the PLL and that increasing the gains has an opposite effect on the two HVDC power flow directions. Moreover, participation factors are analyzed for the 6.3 Hz mode indicating that the main cause of the torsional interactions is the HVDC power control loop. The main findings are verified on the detailed EMTP model.
Original languageEnglish
Article number106491
Number of pages10
JournalElectric Power Systems Research
Early online date17 Jul 2020
Publication statusPublished - 31 Oct 2020

Bibliographical note

The conducted research is part of the corresponding author's PhD project which is funded by Réseau de Transport d'Électricité (RTE), France.


  • Eigenvalue analysis
  • Small-signal state-space modelling
  • SSTI
  • Synchronous generator
  • PLL


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