Unbalanced multiphase load-flow using a positive-sequence load-flow program

Jaime A. Peralta, Francisco de León, Jean Mahseredjian

Research output: Contribution to journalArticlepeer-review


Existing commercial load-flow packages have the capability of solving large balanced transmission systems using little computer memory and processing time. Their computation efficiency overcomes the small imprecision caused by the modeling simplifications and assumptions made in both transmission and distributions simulation packages. However, the interest for modeling more accurately unbalanced multiphase networks and solving complex integrated transmission-distribution systems has greatly increased among the power system specialists. The present work develops an unbalanced multiphase load-flow algorithm with the capability to model all components and network features found in power systems. The proposed algorithm allows the use of any existing positive-sequence load-flow solver as the main engine. The simulation results validated with EMTP-RV and CYMDIST prove that the proposed methodology has good numerical accuracy, robustness and efficiency.

Original languageEnglish (US)
Pages (from-to)469-476
Number of pages8
JournalIEEE Transactions on Power Systems
Issue number2
StatePublished - May 2008


  • Electromagnetic couplings
  • Multiphase systems
  • Positive-sequence
  • Transmission and distribution networks
  • Unbalanced load-flow

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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