Power system state estimation using three-phase models

Phase imbalances can occur at both the distribution and transmission levels of an electric power system. It is shown that these imbalances can have a significant negative impact upon the performance of a state estimator which utilizes only a positive-sequence model of the power system. A state estim...

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Bibliographic Details
Published in:IEEE transactions on power systems 1995-05, Vol.10 (2), p.818-824
Main Authors: Hansen, C.W., Debs, A.S.
Format: Article
Language:English
Subjects:
Applied sciences
Electrical engineering. Electrical power engineering
Electrical power engineering
Exact sciences and technology
Impedance
Load flow
Poles and towers
Power generation economics
Power networks and lines
Power system modeling
Power system simulation
Power systems
Power transmission lines
State estimation
Theory. Simulation
Transmission line matrix methods
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Summary:Phase imbalances can occur at both the distribution and transmission levels of an electric power system. It is shown that these imbalances can have a significant negative impact upon the performance of a state estimator which utilizes only a positive-sequence model of the power system. A state estimator which uses a full three-phase model of the system is developed and various transmission and distribution networks are simulated. Depending on the level of imbalances, the improvement in state accuracy can be dramatic. In addition, an explanation for large reactive power measurement errors is presented and empirically validated.< >
ISSN:0885-8950
1558-0679
DOI:10.1109/59.387922