Dynamic VAr planning in a large power system using trajectory sensitivities

Bishnu Sapkota, Vijay Vittal

Research output: Contribution to journalArticlepeer-review

110 Scopus citations


This paper presents the results of an investigation of a voltage collapse case in a heavily stressed, large power system. The study is focused on examining the impact of a fault at the bulk transmission level in the system during summer peak load conditions. The power system under study has significant amount of air conditioning load. The power system components modeled in detail include both static and dynamic loads at key distribution feeders, over excitation limiters, switchable shunts, STATCOM, and static VAr compensators. The impact of induction motors on voltage stability is studied with the focus on trajectory sensitivity. The concept of trajectory sensitivity index is proposed as a method to identify the location for dynamic VAr support to mitigate the short-term voltage instability problem caused by large disturbances. The comparison of SVCs and STATCOM performance is discussed.

Original languageEnglish (US)
Article number5299293
Pages (from-to)461-469
Number of pages9
JournalIEEE Transactions on Power Systems
Issue number1
StatePublished - Feb 2010


  • Air Conditioning
  • Induction motor
  • Static VAr compensator (SVC)
  • Static compensator (STATCOM)
  • Trajectory sensitivity
  • Voltage stability

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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