A distributed state estimator utilizing synchronized phasor measurements

Weiqing Jiang, Vijay Vittal, Gerald T. Heydt

Research output: Contribution to journalArticlepeer-review

160 Scopus citations


With the creation of balancing authorities by the North American Reliability Council that span large portions of the North American interconnection, and stringent requirements for real time monitoring of power system evolution, faster and more accurate state estimation algorithms that can efficiently handle systems of very large sizes are needed in the present environment. This paper presents a distributed state estimation algorithm suitable for large-scale power systems. Synchronized phasor measurements are applied to aggregate the voltage phase angles of each decomposed subsystem in the distributed state estimation solution. The aggregated state estimation solution is obtained from the distributed solution using a sensitivity analysis based update at chosen boundary buses. Placement of synchronized phasor measurements in the decomposed subsystems is also investigated in this paper. Test results on the IEEE 118-bus test bed are provided.

Original languageEnglish (US)
Pages (from-to)563-571
Number of pages9
JournalIEEE Transactions on Power Systems
Issue number2
StatePublished - May 2007


  • Distributed state estimation
  • Phasor measurement units
  • State estimation
  • Synchronized phasor measurements

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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