Two-stage State Estimation Algorithm for Distribution Network Analysis

Practical distribution system contains many nodes and short branches. As a result, a more efficient and stable distribution state estimation (DSE) algorithm is needed to properly handle the inverse operation of its large-scale ill-conditioned information matrix. This paper proposed a two-stage DSE a...

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Bibliographic Details
Main Authors: Dong, Jiaojiao, Zhu, Lin, Liu, Yilu, Rizy, D. Tom, Wang, Fei Fred, Tolbert, Leon M., Glass, Jim
Format: Conference Proceeding
Language:English
Subjects:
Coordinate measuring machines
Current measurement
Distribution state estimation
Mathematical model
Measurement uncertainty
pseudo inverse
Real-time systems
State estimation
three-phase distribution system
Voltage measurement
weighted least square
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Summary:Practical distribution system contains many nodes and short branches. As a result, a more efficient and stable distribution state estimation (DSE) algorithm is needed to properly handle the inverse operation of its large-scale ill-conditioned information matrix. This paper proposed a two-stage DSE algorithm to transform the inverse operation into addition and multiplication operations in a recursive manner. It includes pseudo measurement preprocessing in the offline stage where an approximate linear estimator is adopted to relieve most of computation burdens, and real-time correction in the online stage where a nonlinear estimator is used to update the estimation. Numerical results of the method applied to both IEEE standard test systems and an actual distribution system show the accuracy and effectiveness of the proposed algorithm.
ISSN:2474-1507
DOI:10.1109/AUPEC.2018.8757946