Enhancement of linearity and constancy of PMU‐based voltage stability index: application to a Korean wide‐area monitoring system. Issue 17 (22nd July 2020)

• Record Type: Journal Article
• Authors: Jung, Jaeyeop; Cho, Hwanhee; Park, Bohyun; Nam, Suchul; Hur, Kyeon; Lee, Byongjun
• Is Part Of: IET generation, transmission & distribution. Volume 14:Issue 17(2020)
• Page Start: 3357
• Page End: 3364
• Publication Date: 2020-07-22
• Subjects: phasor measurement -- power system stability -- power system measurement -- phase measurement; Korean power system operation data -- Korean wide‐area monitoring system -- previous stability index -- constancy -- PMU‐based voltage stability index -- wide‐area voltage stability monitoring method -- synchronised phasor measurements -- system changes -- power system stability level; Electric power production -- Periodicals; Electric power transmission -- Periodicals; Electric power distribution -- Periodicals; 621.3105
• DOI: 10.1049/iet-gtd.2019.0773
• Languages: English
• ISSNs: 1751-8687

Abstract

Abstract : 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.