Optimal Transmission Switching Considering N-1 Contingencies on Power Transmission Lines

Stanislao Pinzon, Diego Carrion, Esteban Inga

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


Optimal transmission switching allows to make different types of analysis focused on improving the functionality of electrical power systems. The implementation of this method along with contingency analysis seek to increase the flexibility of the electrical system through changes in network topology and power flow redirection. In this article, an analysis is carried out about the impact of transmission line switching in terms of loadability and voltage angles. The optimal transmission switching model used is formulated using optimal DC power flows as a mixed-integer linear program problem. The research considers simple contingencies with the loss of at least one transmission line and it contrasts the results obtained in three scenarios; without contingencies and switching actions, optimal switching without contingencies and optimal switching after a contingency has occurred. The results obtained show a small number of unviable solutions prior to the implementation of switching actions. This exposes the clear possibility of applying line switching even when a contingency has occurred without losing load and keeping costs low.

Original languageEnglish
Article number9448535
Pages (from-to)534-541
Number of pages8
JournalIeee Latin America Transactions
Issue number4
StatePublished - Apr 2021

Bibliographical note

Funding Information:
This work was supported by Universidad Politécnica Sale-siana and Grupo de Investigación en Redes Eléctricas In-teligentes under the project Optimal transmission switching in electrical power systems in the event of contingencies.

Publisher Copyright:
© 2003-2012 IEEE.


  • contingency analysis
  • economic dispatch
  • Optimal power flow
  • optimal transmission switching


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