A revised branch current-based distribution system state estimation algorithm and meter placement impact

With the development of automation in distribution systems, distribution supervisory control and data acquisition (SCADA) and many automated meter reading (AMR) systems have been installed on distribution systems. Also distribution management system (DMS) have advanced and include more sophisticated...

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Bibliographic Details
Published in:IEEE transactions on power systems 2004-02, Vol.19 (1), p.207-213
Main Authors: Haibin Wang, Schulz, N.N.
Format: Article
Language:English
Subjects:
Automatic meter reading
Automation
Electric utilities
Instruments
Jacobian matrices
Loss measurement
Meter reading
Real time systems
SCADA systems
State estimation
Studies
Testing
Voltage
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Summary:With the development of automation in distribution systems, distribution supervisory control and data acquisition (SCADA) and many automated meter reading (AMR) systems have been installed on distribution systems. Also distribution management system (DMS) have advanced and include more sophisticated analysis tools. The combination of these developments is providing a platform for development of distribution system state estimation (DSE). A branch-current-based three-phase state estimation algorithm for distribution systems has been developed and tested. This method chooses the magnitude and phase angle of the branch current as the state variables. Because of the limited number of real-time measurements in the distribution system, the state estimator can not acquire enough real-time measurements for convergence, so pseudo-measurements are necessary for distribution system state estimator. The load estimated at every node from the AMR systems is used as a pseudo-measurement for the state estimator. The algorithm has been tested on three IEEE radial test feeders. In addition to this new strategy for DSE, another issue is meter-placement. This topic includes the type of measurement as well as the location of the measurement. Our results show the impact of these two issues on accuracy. Several general meter rules based on this analysis are outlined.
ISSN:0885-8950
1558-0679
DOI:10.1109/TPWRS.2003.821426