Z-bus loss allocation

F. Galiana, I. Kockar, A. Conejo

Research output: Contribution to journalArticlepeer-review

392 Citations (Scopus)


This paper presents a new procedure for allocating transmission losses to generators and loads in the context of pools operated under a single marginal price derived from a merit-order approach. The procedure is based on the network Z-bus matrix, although all required computations exploit the sparse Y-bus matrix. One innovative feature and advantage of this method is that, unlike other proposed approaches, it exploits the full set of network equations and does not require any simplifying assumptions. The method is based on a solved load flow and is easily understood and implemented. The loss allocation process emphasizes current rather than power injections, an approach that is intuitively reasonable and leads to a natural separation of system losses among the network buses. Results illustrate the consistency of the new allocation process with expected results and with the performance of other methods
Original languageEnglish
Pages (from-to)105-110
Number of pages5
JournalIEEE Transactions on Power Systems
Issue number1
Publication statusPublished - Feb 2001


  • Ancillary service
  • impedance and admittance matrix
  • transmission loss allocation

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