An improved state estimator in distribution systems

Author

Li, Hui

Author_Institution

Coll. of Autom., Beijing Inf. Sci. & Technol. Univ., Beijing, China

Volume

3

fYear

2011

fDate

10-12 June 2011

Firstpage

30

Lastpage

34

Abstract

An improved state estimation algorithm based on branch current is put forward to revise leverage-point measurements with gross errors in distribution systems. Using the inherent characteristic of leverage-point measurement, this method introduces structure robust factors into the objective function of the weighted least absolute value (WLAV) estimator for weakening the masking effect of bad leverage-point measurements. Meanwhile, a new approach is proposed to deal with voltage-magnitude measurements on the branch-current-based state estimation so that it can increase the measurement redundancy and the estimation precision, and enhance the observability. An analysis is done for the IEEE 123-bus systems and the tested results show the advantages of each one of new ideas.

Keywords

distribution networks; observability; power system measurement; state estimation; voltage measurement; IEEE 123-bus system; branch-current-based state estimation; leverage-point measurement; observability; power distribution system; state estimation algorithm; voltage-magnitude measurement; weighted least absolute value estimation; Current measurement; Measurement uncertainty; Power systems; Robustness; State estimation; Voltage measurement; Weight measurement; leverage-point measurement; measurement transformation; state estimation;

fLanguage

English

Publisher

ieee

Conference_Titel

Computer Science and Automation Engineering (CSAE), 2011 IEEE International Conference on

Conference_Location

Shanghai

Print_ISBN

978-1-4244-8727-1

Type

conf

DOI

10.1109/CSAE.2011.5952628

Filename

5952628