Extended Geometric Feature Extraction Process for Detecting Multiple Frequency Oscillations in KEPCO System

Hwanhee Cho, Namki Choi, Suchul Nam, Byongjun Lee

Research output: Contribution to journalArticlepeer-review


In this study, a new algorithm dealing with time-varying modes for determining and tracing multiple frequency oscillations in power systems is proposed. Multiple modes or resonance of forced and natural oscillations can have severe effects on a power system. Therefore, it is crucial to recognize the dominant natural and forced oscillations because the oscillation mode possesses time-varying features that depend on the system operating conditions or changes in the parameters. The salient features of the proposed algorithm include the use of a time-series-based approach to recognize undesired modes (including multiple oscillations over a wide frequency range), tracing time-varying modes as the power system operating condition changes, and effectively determining and applying the oscillation features before implementing the corresponding control measures in the power system. In this study, multiple frequency oscillation scenarios for the test system and practical measurement data for a recent incident that occurred in Korea Electric Power Corporation (KEPCO) system are discussed. Therefore, the proposed algorithm can be practically applied in wide-area monitoring systems, not only for a single forced oscillation or local mode detection but also for system-wide inter-area mode recognition.

Original languageEnglish
Article number9459691
Pages (from-to)89439-89451
Number of pages13
JournalIEEE Access
Publication statusPublished - 2021

Bibliographical note

Funding Information:
This work was supported in part by the National Research Foundation of Korea (NRF) grant through the Korea Government [Minister of Science and ICT (MSIT)] under Grant NRF-2021R1A2C2006511, in part by the Human Resources Program in Energy Technology of the Korea Institute of Energy Technology Evaluation and Planning (KETEP), and in part by the Ministry of Trade, Industry and Energy (MOTIE) of the Republic of Korea under Grant 20204010600220.

Publisher Copyright:
© 2013 IEEE.


  • Forced oscillation
  • mode tracing
  • multiple frequency oscillation
  • natural oscillation
  • time-varying modes

ASJC Scopus subject areas

  • General Computer Science
  • General Materials Science
  • General Engineering


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