PMU Measurement Uncertainty Considerations in WLS State Estimation

Author

Chakrabarti, Saikat ; Kyriakides, Elias

Author_Institution

KIOS Res. Center for Intell. Syst. & Networks & the Dept. of Electr. & Comput. Eng., Univ. of Cyprus, Nicosia

Volume

24

Issue

2

fYear

2009

fDate

5/1/2009 12:00:00 AM

Firstpage

1062

Lastpage

1071

Abstract

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.

Keywords

linear programming; power system measurement; power system state estimation; classical uncertainty propagation theory; linear programming; phasor measurement units; pseudo-measurements; weighted least squares state estimation; Measurement uncertainty; phasor measurement units; state estimation; total vector error;

fLanguage

English

Journal_Title

Power Systems, IEEE Transactions on

Publisher

ieee

ISSN

0885-8950

Type

jour

DOI

10.1109/TPWRS.2009.2016295

Filename

4803729