• DocumentCode
    28313
  • Title

    A Hybrid State Estimator For Systems With Limited Number of PMUs

  • Author

    Gol, Murat ; Abur, Ali

  • Author_Institution
    ECE Dept., Northeastern Univ., Boston, MA, USA
  • Volume
    30
  • Issue
    3
  • fYear
    2015
  • fDate
    May-15
  • Firstpage
    1511
  • Lastpage
    1517
  • Abstract
    This paper is concerned about effective incorporation of a limited number of phasor measurement unit (PMU) measurements into the state estimation solution in order to enhance the state tracking accuracy and speed. This is particularly important for fast changing system conditions when rapid control action may be necessary based on the onset of voltage instability due to an unexpected event. Under such conditions, SCADA-based state estimators may be too slow in capturing the changes in system state due to the low scan rates of the order of seconds. PMU measurements on the other hand provide refresh rates of milliseconds; however, they may not provide full system observability. In this work, a solution is proposed in order to address the lack of observability by the PMU measurements while maintaining fast tracking capability as well as estimation robustness against pseudo-measurement and PMU errors. Robustness is accomplished via the use of the so-called least absolute value estimator which minimizes L1 norm of the residuals. Simulation results are provided to illustrate the expected benefits of this implementation on test systems.
  • Keywords
    SCADA systems; phasor measurement; power system state estimation; PMU measurements; SCADA-based state estimators; fast changing system; hybrid state estimator; phasor measurement unit; state estimation; state tracking accuracy; voltage instability; Current measurement; Measurement uncertainty; Phasor measurement units; Power measurement; Time measurement; Vectors; Voltage measurement; Least absolute value (LAV) estimator; phasor measurement units (PMUs); state estimation; synchronized measurements; voltage tracking;
  • fLanguage
    English
  • Journal_Title
    Power Systems, IEEE Transactions on
  • Publisher
    ieee
  • ISSN
    0885-8950
  • Type

    jour

  • DOI
    10.1109/TPWRS.2014.2344012
  • Filename
    6878488