Computation of electro-magnetic transients using dual or multiple time steps

Adam Semlyen, Francisco de León

Research output: Contribution to journalArticlepeer-review


When computing transients with the EMTP (the Electro-Magnetic Transients Program) a single time step is selected for the trapezoidal integration all over the system. When this step is small because of the presence of a “fast” component, the simulation may be significantly slowed down. This paper presents a procedure by which the computations at selected fast buses can be performed with smaller time steps than at the rest of the system. The linkage of the variables at two different time steps is achieved in a simple way at the line-bus interface by a small addition to any existing implementation of an electro-magnetic transients program. Significant computational savings can be obtained without any loss of accuracy.

Original languageEnglish (US)
Pages (from-to)1274-1281
Number of pages8
JournalIEEE Transactions on Power Systems
Issue number3
StatePublished - Aug 1993


  • Dual time ster
  • Electromagnetic transients
  • Stiff systems
  • Trapezoidal integratior

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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