KEPCO Journal on Electric Power and Energy

Korea Electric Power Corporation (한국전력공사)
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A Study on the Low Frequency Oscillation Using PMU Measurement Data

PMU 데이터를 이용한 저주파 진동분석 연구

  • Kim, Yonghak (KEPCO Research Institute, Korea Electric Power Corporation) ;
  • Nam, Suchul (KEPCO Research Institute, Korea Electric Power Corporation) ;
  • Ko, Baekkyeong (KEPCO Research Institute, Korea Electric Power Corporation) ;
  • Kang, Sungbum (KEPCO Research Institute, Korea Electric Power Corporation) ;
  • Shim, Kwansik (Department of Electrical Engineering, Chonnam National Univ.)
  • Received : 2020.03.24
  • Accepted : 2020.04.09
  • Published : 2020.09.30
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Abstract

It is very important to evaluate on/off-line stability to operate the power system stably and economically. Until now, we have continuously secured the operation reliability of the power system through the evaluation of transient, voltage and small signal stability. This paper proposes that it is possible to operate in KWAMS by applying the multi-section analysis and subspace methods and verifying the reliability of the algorithms to directly estimate the dominant oscillation mode of the power system from the signal waveform acquired from the phasor measurement units. In addition, this paper shows that the dominant oscillation mode can be detected from real-time measurement data in power systems. Therefore, if we can monitor the state of the power system in real time, it is possible to avoid a large-scale power outage by knowing the possibility of the power system accident in advance.

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