PMU Measurement Uncertainty Considerations in WLS State Estimation

A method to assign weights to the measurements obtained through phasor measurement units (PMUs) in a weighted least squares (WLS) state estimation is presented in this paper. The uncertainties for direct measurements are obtained from the manufacturer's specifications. For pseudo-measurements,...

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Bibliographic Details
Published in:IEEE transactions on power systems 2009-05, Vol.24 (2), p.1062-1071
Main Authors: Chakrabarti, S., Kyriakides, E.
Format: Article
Language:English
Subjects:
Conductors
Conductors (devices)
Least squares approximation
Least squares method
Linear programming
Manufacturing
Measurement uncertainty
Phasor measurement units
Phasors
Specifications
State estimation
System testing
total vector error
Uncertainty
Upper bound
Upper bounds
Weight measurement
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Summary:A method to assign weights to the measurements obtained through phasor measurement units (PMUs) in a weighted least squares (WLS) state estimation is presented in this paper. The uncertainties for direct measurements are obtained from the manufacturer's specifications. For pseudo-measurements, the uncertainties are evaluated by using the classical uncertainty propagation theory. The propagation of measurement uncertainty as a function of line length and conductor type is also investigated. The lower and upper bounds of the estimated states considering the measurement uncertainties are found by using linear programming. The proposed method is applied on the IEEE 14-, 30-, 57-, and 118-bus test systems, and the state estimation results including the lower and upper bounds of the estimated states are presented.
ISSN:0885-8950
1558-0679
DOI:10.1109/TPWRS.2009.2016295