Optimal transmission switching with contingency analysis

Kory W. Hedman, Richard P. O'Neill, Emily Bartholomew Fisher, Shmuel S. Oren

Research output: Contribution to journalArticlepeer-review

352 Scopus citations


In this paper, we analyze the N-1 reliable dc optimal dispatch with transmission switching. The model is a mixed integer program (MIP) with binary variables representing the state of the transmission element (line or transformer) and the model can be used for planning and/or operations. We then attempt to find solutions to this problem using the IEEE 118-bus and the RTS 96 system test cases. The IEEE 118-bus test case is analyzed at varying load levels. Using simple heuristics, we demonstrate that these networks can be operated to satisfy N-1 standards while cutting costs by incorporating transmission switching into the dispatch. In some cases, the percent savings from transmission switching was higher with an N-1 DCOPF formulation than with a DCOPF formulation.

Original languageEnglish (US)
Pages (from-to)1577-1586
Number of pages10
JournalIEEE Transactions on Power Systems
Issue number3
StatePublished - 2009
Externally publishedYes


  • Integer programming
  • Power generation dispatch
  • Power system economics
  • Power system reliability
  • Power transmission control
  • Power transmission economics
  • Transmission planning

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


Dive into the research topics of 'Optimal transmission switching with contingency analysis'. Together they form a unique fingerprint.

Cite this