Topological reconstruction method for three-phase low voltage distribution network

Abstract

The invention relates to a topological reconstruction method for a three-phase low voltage distribution network. The invention acquires the timing sequence voltage from a smart meter on the user sideon the basis of low voltage distribution network timing sequence voltage data. Firstly, the correlation analysis method is used to solve a correlation coefficient between each bus bar voltage data andthe reference voltage, and is identified as a phase with the largest correlation coefficient; a phase identification process is completed, phase connection information of each bus bar is acquired; all the bus bars are divided into three groups: A phase, B phase, and C phase according to different phases; the Chow-Liu algorithm is used to acquire cross correlation information (shown in the description) matrix among the three groups of bus bars; and then the cross-correlation information is used to complete the topology reconstruction of the three groups of undirected networks; and finally, thethree groups of reconstructed undirected networks are integrated to obtain a complete topology network structure.

Description

technical field [0001] The invention belongs to the technical field of electric power system power distribution, and in particular relates to a technology for reconstructing the topology of end users of a three-phase low-voltage power distribution network by using time series voltage data of a power distribution network. Background technique [0002] With the development of technology, intelligent monitoring equipment has been able to accurately monitor the information of high-voltage and medium-voltage power grids. Unauthorized modification of lines and other issues, the phase information on the user side of the three-phase low-voltage distribution network is often incomplete or wrong. However, the network topology information of the three-phase low-voltage distribution network is essential for the safe and stable operation of the network, and the accurate phase information at the user level is also of great significance to improve the operation performance of the three-pha...

AI Technical Summary

Problems solved by technology

[0005] 1. At present, the phase is not distinguished in the topological network reconstruction problem based on the time-series voltage data of the distribution network;

[0006] 2. The research on power system topology is mostly limited to the identification of transmission network topology errors and the detection of topology changes. However, at present, the distribution network is frequently updated and the wiring is complicated. Massive data make it difficult to realize distribution network topology identification

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