Enhancement of linearity and constancy of PMU-based voltage stability index: Application to a Korean wide-area monitoring system

Jaeyeop Jung, Hwanhee Cho, Bohyun Park, Suchul Nam, Kyeon Hur, Byongjun Lee

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


This study presents a new wide-area voltage stability monitoring method using synchronised phasor measurements. The salient features of the proposed index are the following: (i) It ensures constancy, which is the ability to maintain the same scale even if the system changes. (ii) It is pseudo-linear with respect to the power system stability level, which enhances intuitiveness for real-time operation. Accordingly, stability can be uniformly compared in various situations, and thus, the index can be used as a solid criterion or threshold point for system operation. A verification study of the proposed index with regard to constancy is carried out using Korean power system operation data. Furthermore, an implementation of the proposed method for the Korean wide-area monitoring system is presented, and it is demonstrated that the proposed index detects event more clearly than previous stability index through an actual event measured using phasor measurement units.

Original languageEnglish
Pages (from-to)3357-3364
Number of pages8
JournalIET Generation, Transmission and Distribution
Issue number17
Publication statusPublished - 2020 Sept 4

Bibliographical note

Funding Information:
This study was supported by the ‘Development of situation cognition technology with power system big data for power system stable operation’ project managed by the Korea Electric Power Research Institute ?No. R17TA14) and ‘Human Resources program in Energy Technology’ of the Korea Institute of Energy Technology Evaluation and Planning?KETEP) granted financial resource from the Ministry of Trade, Industry & Energy, Republic of Korea ?No.20174030201820).

Publisher Copyright:
© The Institution of Engineering and Technology 2020.

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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