Topological reconstruction method for three-phase low voltage distribution network

A low-voltage distribution network and distribution network technology, applied in the direction of electrical components, circuit devices, AC network circuits, etc., can solve the problems of difficult to realize distribution network topology identification, no phase distinction, complex wiring of distribution network, etc. Achieve the effect of solving system line loss and energy consumption problems

Active Publication Date: 2018-10-19
STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST +2
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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 o...

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  • Topological reconstruction method for three-phase low voltage distribution network
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  • Topological reconstruction method for three-phase low voltage distribution network

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Embodiment Construction

[0037] The technical solutions of the present invention will be further introduced in detail below in conjunction with the accompanying drawings and specific embodiments.

[0038] The invention proposes a method of first identifying and distinguishing the phases of the busbars, and then performing the topology reconstruction of the distribution network.

[0039] as attached figure 1 and figure 2As shown, in the distribution network, the electric energy enters the distribution box of the end user after passing through the main power distribution room, the first-level power distribution equipment and the second-level power distribution equipment. The task of the first-level power distribution equipment here is to transform the medium voltage of 10kV into a low voltage (system voltage) of 400V / 230V, where 400V is the voltage between the three phases (that is, three phases A, B, and C) Value, 230V is the phase voltage of the three phase lines relative to the neutral line. Due ...

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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...

Claims

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Application Information

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IPC IPC(8): H02J3/00
CPCH02J3/00H02J2203/20
Inventor 李文启李晓宇付美李书芳耿俊成田世明潘明明
Owner STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST
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