State estimation in the presence of synchronized measurement

State estimation in the presence of synchronized measurement

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State estimation plays a critical role for the wide-area monitoring system at the control center. The power system network, geographically spread over a large area, is monitored and controlled using the measurements collected at regular intervals. A number of application functions are performed based on the estimated states of the system to ensure secure and reliable operation of the power system. The amplitude and angle of the voltage phasor at each bus constitute the states of the system. The measurements are collected from the field and telemetered to the control center, where they are processed, typically using standard-weighted least squares static state estimator, to estimate the states of the system.

Chapter Contents:

  • 10.1 State estimation
  • 10.1.1 SCADA measurements
  • 10.1.2 Phasor measurement unit
  • 10.1.3 State estimation functions
  • 10.1.4 Measurement model for static state estimation
  • 10.1.5 Assigning weights to the measurements
  • Gaussian error distribution
  • Uniform error distribution
  • Calculation of combined uncertainty
  • 10.2 Conventional state estimation
  • 10.3 Linear state estimation
  • 10.4 Postprocessing sequential state estimation
  • 10.5 Preprocessing hybrid state estimation
  • 10.6 Regularization method
  • 10.6.1 Selection of regularization parameter by L-curve method
  • 10.6.2 Regularized state estimation problem
  • 10.7 Case study
  • 10.7.1 Case I for IEEE 14-bus test system
  • 10.7.2 Case II for IEEE 14-bus test system
  • 10.8 Conclusion
  • References

Inspec keywords: power system reliability; power system measurement; power system security; power system economics; power system state estimation

Other keywords: standard-weighted least square static state estimator; synchronized measurement; control center; power system security; wide-area monitoring system; power system operation reliability; power system state estimation

Subjects: Power system control; Reliability; Power system measurement and metering; Power system management, operation and economics

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