Corrective Transmission Switching for N-1-1 Contingency Analysis

Mojdeh Hedman, Mostafa Sahraei-Ardakani, Yousef M. Al-Abdullah

Research output: Contribution to journalArticlepeer-review

32 Scopus citations


System operators are required to serve the load in the most cost-effective way while maintaining the integrity of the system and heeding reliability requirements. In the day-ahead market, operators acquire reserves in an attempt to guarantee N-1 reliability; yet, reserve deliverability is not guaranteed. Prior research has shown that the use of transmission switching, or topology control, may help improve reserve deliverability. In this paper, transmission switching is used as a corrective mechanism to help the system achieve N-1-1 reliability, where not only has the system lost a single element, but also it experiences the loss of a second major element after an adjustment period. In an attempt to preserve N-1-1 reliability, for this paper, a day-ahead unit commitment model that acquires supplementary reserves is solved. The day-ahead market solution is then tested for N-1-1 reliability using contingency analysis models with and without transmission switching. The methodology can be employed at the day-ahead time stage to ensure the system has acquired sufficient supplemental reserves. The results demonstrate that not only can corrective transmission switching be beneficial post-contingency without inhibiting the ability to return to N-1 reliability, but it can also help obtain an N-1-1 reliable solution.

Original languageEnglish (US)
Article number7579615
Pages (from-to)1606-1615
Number of pages10
JournalIEEE Transactions on Power Systems
Issue number2
StatePublished - Mar 2017


  • Contingency analysis
  • N-1-1 reliability
  • corrective transmission switching
  • large-scale power systems
  • power system reliability
  • power transmission control
  • topology control

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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