Equivalent line limit calculation for power system equivalent networks

Saurav Mohapatra, Wonhyeok Jang, Thomas J. Overbye

Research output: Contribution to journalArticlepeer-review


This paper focuses on the relatively unexplored subject of creating limit-preserving equivalents (LPEs). There is a push to develop LPEs for power system interconnections to be used in markets and reliability studies. The equivalents that exist for these interconnections do not capture thermal limits of equivalent lines, which results in their transmission limits being significantly different from the original interconnection limits. Assigning noninfinite and nonzero limits to equivalent lines is the niche of this paper. This is done by considering an unloaded network, which is operating point independent. A solution method is developed and discussed, which is capable of assigning lower, best, and upper estimates for equivalent line limits and is proposed for use towards developing LPEs.

Original languageEnglish (US)
Article number6730712
Pages (from-to)2338-2346
Number of pages9
JournalIEEE Transactions on Power Systems
Issue number5
StatePublished - Sep 2014
Externally publishedYes


  • Attribute-preserving equivalents
  • equivalent line limits
  • power transfer distribution factors
  • quadratic program
  • total transfer capability
  • transmission limits

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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