A constrained formulation for hybrid state estimation

Gustavo Valverde, Saikat Chakrabarti, Elias Kyriakides, Vladimir Terzija

Research output: Contribution to journalArticlepeer-review

100 Citations (Scopus)


This paper presents a new hybrid constrained power system state estimator. The conventional and synchrophasor measurements are simultaneously incorporated in the estimation problem without using any transformation of measurements. This constrained formulation makes it possible to take advantage of information from phasor measurement unit (PMU) branch current and voltage measurements, improving the accuracy of the existing estimators. The methodology is applied on the IEEE 14-, 57-, and 118-bus test systems, and its performance is compared with other hybrid estimators.

Original languageEnglish
Article number5608534
Pages (from-to)1102-1109
Number of pages8
JournalIEEE Transactions on Power Systems
Issue number3
Publication statusPublished - Aug 2011
Externally publishedYes


  • Constrained state estimation
  • hybrid state estimation
  • phasor measurement units
  • synchrophasor measurements
  • uncertainty propagation


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