Mitigating Subsynchronous Torsional Interaction Using Geometric Feature Extraction Method

Hyeokjin Noh, Hwanhee Cho, Sungyun Choi, Byongjun Lee

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


This paper proposes a method to mitigate subsynchronous torsional interaction detected during power system operation. This innovative method employs the delay reconstruction of the damping controller of a thyristor-controlled series compensator. This addresses the need to detect and manage stability and electromagnetic transients in power systems caused by the increasing use of fast-response power electronics. Previously, severe oscillation conditions could be avoided via analysis of the subsynchronous torsional interaction scenarios during the planning stage, enabling the suppression of oscillations. However, planning, modeling, and analysis for various scenarios becomes more difficult as the complexity of the power system increases, owing to the use of renewable energy and the incorporation of topology changes. Therefore, interest in measurement data-based real-time oscillation analysis has increased. The first step of the mitigation strategy proposed herein reconstructs nonlinear time-series data to detect subsynchronous torsional interaction in real time and generate alert signals. The second step of the strategy is that the controller mitigates oscillations by controlling the firing angle using the geometric feature extraction method. In this paper, the relaxation of the frequency oscillation in the subsynchronous region of about 22 Hz and about 18 Hz was verified through two simulation cases.

Original languageEnglish
Article number16110
JournalSustainability (Switzerland)
Issue number23
Publication statusPublished - 2022 Dec

Bibliographical note

Publisher Copyright:
© 2022 by the authors.


  • damping control
  • delay reconstruction
  • mitigation
  • subsynchronous torsional interaction
  • thyristor-controlled series compensator

ASJC Scopus subject areas

  • Computer Science (miscellaneous)
  • Environmental Science (miscellaneous)
  • Geography, Planning and Development
  • Energy Engineering and Power Technology
  • Hardware and Architecture
  • Management, Monitoring, Policy and Law
  • Computer Networks and Communications
  • Renewable Energy, Sustainability and the Environment


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