Power quality indices for transient disturbances

Yong June Shin, Edward J. Powers, Mack Grady, Ari Arapostathis

Research output: Contribution to journalArticlepeer-review

120 Citations (Scopus)


For reasonable power quality assessment of transient disturbances in electric power systems, new transient power quality indices are developed based on a signal processing technique, time-frequency analysis. Based on the time-frequency distribution of a transient disturbance, a set of time-frequency based power quality indices are developed. In this paper, the instantaneous disturbance energy ratio, normalized instantaneous disturbance energy ratio, instantaneous frequency, and instantaneous K-factor are suggested for transient power quality assessment. Time-frequency based power quality indices allow one to quantify the effects of transient disturbances with high-resolution and accuracy.

Original languageEnglish
Pages (from-to)253-261
Number of pages9
JournalIEEE Transactions on Power Delivery
Issue number1
Publication statusPublished - 2006 Jan

All Science Journal Classification (ASJC) codes

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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