Linear Programming Contractor for Interval Distribution State Estimation Using RDM Arithmetic

State estimation (SE) of distribution networks heavily relies on pseudo measurements that introduce significant errors, since real-time measurements are insufficient. Interval SE models are regularly used, where true values of system states are supposed to be within the estimated intervals. However,...

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Bibliographic Details
Published in:IEEE transactions on power systems Vol. 36; no. 3; pp. 2114 - 2126
Main Authors: Ngo, VietCuong, Wu, Wenchuan
Format: Journal Article
Language:English
Published: New York IEEE 01.05.2021
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
Algorithms
Arithmetic
Constraints
Correlation
Differential calculus
Distance measurement
Distribution network
Distribution networks
Electronic equipment tests
interval state estimation
Linear equations
Linear programming
Lower bounds
Mathematical model
mean value theorem
Measurement uncertainty
Optimization
Phase distribution
relative-distance-measurement
State estimation
State variable
Voltage measurement
ISSN:0885-8950, 1558-0679
Online Access:Get full text
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Summary:State estimation (SE) of distribution networks heavily relies on pseudo measurements that introduce significant errors, since real-time measurements are insufficient. Interval SE models are regularly used, where true values of system states are supposed to be within the estimated intervals. However, conventional interval SE algorithms cannot consider the correlations of same interval variables in different terms of constraints, which results in overly conservative estimation results. In this paper, we propose a new interval SE model that is based on the relative distance measure (RDM) arithmetic. In the proposed model, measurement errors are assumed to be bounded in given sets and the state variables are described as RDM variables. Since the SE model is a non-convex, the solution's credibility cannot be guaranteed. Therefore, each nonlinear measurement equation in the model is transformed into dual inequality linear equations using the mean value theorem. The SE model is finally reformulated as a linear programming contractor that iteratively narrows the upper and lower bounds of the estimated state variables. Numerical tests on IEEE three-phase distribution networks show that the proposed method outperforms the conventional interval-constrained propagation, modified Krawczyk-operator and optimization based interval SE methods.
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ISSN:0885-8950
1558-0679
DOI:10.1109/TPWRS.2020.3033065