State estimation and power flow analysis of power systems

Jiaxiong Chen, Yuan Liao

Research output: Contribution to journalArticlepeer-review

19 Scopus citations


State estimation and power flow analysis are important tools for analysis, operation and planning of a power system. In this paper, a new state estimation method based on the extended weighted least squares (WLS) method for considering both measurement errors and model inaccuracy is presented. Two bus, three bus, and IEEE 14 bus test cases are employed to evaluate the accuracy of the method. The comparison results show that the extended WLS method may outperform traditional WLS approach when the model is not accurate. In addition, this paper investigates a method based on Z matrix to implement power flow in a transmission system with multiple types of loads (e.g. constant PQ, constant impedance and constant current magnitude loads or mixed loads). The load flow results demonstrate that the method is effective and easy to implement when composite load types exist in the system. Our studies also show that it may be possible that multiple solutions exist for a power flow problem.

Original languageEnglish
Pages (from-to)685-691
Number of pages7
JournalJournal of Computers
Issue number3
StatePublished - 2012


  • Power flow analysis
  • State estimation
  • Weighted least squares method

ASJC Scopus subject areas

  • General Computer Science


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