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Linear Programming Contractor for Interval Distribution State Estimation Using RDM Arithmetic
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DOI：10.1109/TPWRS.2020.3033065.png)
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摘要
En 中文
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.
Keyword:
Distribution networks
Mathematical model
Voltage measurement
State estimation
Measurement uncertainty
Correlation
Distribution network
interval state estimation
relative-distance-measurement
mean value theorem
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期刊
IF:
7.2
论文数:
1.1W
被引数:
5.0W
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