A new methodology for identification of critical lines using damping sensitivity analysis

Yoon Sung Cho, Hwachang Song, Gilsoo Jang

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


When an inter-area mode dominates a low-frequency oscillation in a stressed condition, control of the active power flow of interface lines, with compensating devices, can effectively reduce the electromechanical power oscillations. In general, interface lines in which inter-area oscillations are large are considered to be good locations for installation of compensating devices. A sensitivity analysis with respect to change in active power flow can provide an important factor in electric power system operation. This paper proposes a new methodology to calculate the damping sensitivity with respect to change in active power flow, which can be useful for accurate selection of critical lines from the viewpoint of small-signal stability. In the proposed methodology, a damping sensitivity index is used to select the critical lines to damp power system oscillations. This paper describes how to derive the damping sensitivity for the selected mode and illustrates an example applying the proposed algorithm to a simple two-area system and the New England 39-bus test system.

Original languageEnglish
Pages (from-to)562-568
Number of pages7
JournalElectric Power Systems Research
Issue number4
Publication statusPublished - 2009 Apr

Bibliographical note

Funding Information:
This work is an outcome of the KETEP fostering program and supported by the Korea Science & Engineering Foundation NRL Program grant (No. R0A-2008-000-20107-0) funded by the Korea government.


  • Damping sensitivity
  • Eigenvalue analysis
  • Identification of critical lines
  • Inter-area oscillation
  • Small-signal stability

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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