WLS distribution system state estimator based on voltages or branch-currents: Accuracy and performance comparison

This paper presents a comparison between the two main classes of Weighted Least Squares (WLS) state estimators used in distribution systems: state estimators based on node voltage state variables and estimators based on a state expressed in terms of branch-currents. In particular, the actual accurac...

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Bibliographic Details
Published in2013 IEEE International Instrumentation and Measurement Technology Conference (I2MTC) pp. 493 - 498
Main Authors Pau, M., Pegoraro, P. A., Sulis, S.
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.05.2013
Subjects
Accuracy
Current measurement
Distribution Networks
Distribution System State Estimator
Estimation
Phase measurement
Phasor measurement units
Smart Distribution Systems
Vectors
Voltage measurement
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ISBN9781467346214
1467346217
ISSN1091-5281
DOI10.1109/I2MTC.2013.6555467

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Summary:This paper presents a comparison between the two main classes of Weighted Least Squares (WLS) state estimators used in distribution systems: state estimators based on node voltage state variables and estimators based on a state expressed in terms of branch-currents. In particular, the actual accuracy achieved for the estimated quantities by these estimators and their modified versions is analysed in details along with their performance, considering different types of real-time measurements (traditional or phasorial), different configurations of the measurement system and the impact of the network parameters uncertainty. Results obtained on two distribution networks with different scale, 18-bus and 95-bus, are presented and discussed.
ISBN:9781467346214
1467346217
ISSN:1091-5281
DOI:10.1109/I2MTC.2013.6555467