Low-voltage power distribution network fault positioning system and method based on topology dynamic identification

Abstract

The invention discloses a low-voltage power distribution network fault positioning system and method based on topology dynamic identification. The system comprises a data acquisition and transmission layer, a fault positioning layer and an application layer. Wherein the user meter box data acquisition module and the branch box data acquisition module respectively acquire data and upload related fault information; the fault positioning module is used for sending related instruction notifications to the branch box data acquisition module and the user meter box data acquisition module, obtaining data information, operation state data of all lines of the low-voltage power distribution network and user electric energy meter data, evaluating node stability in a topological structure of the low-voltage power distribution network, selecting a shortest path, judging a fault reason, and sending the fault information to the branch box data acquisition module and the user meter box data acquisition module. Positioning the position of a fault node by using a fuzzy correlation threshold value between the nodes; and finally, the fault positioning information is uploaded to a cloud platform, and the fault information is transmitted to a user and working operation and maintenance personnel, so that the working personnel can quickly and accurately find out the faulted equipment or line, and repair the faulted equipment in time.

Description

technical field [0001] The invention belongs to the field of low-voltage distribution network fault early warning, and relates to a low-voltage distribution network fault location system and method based on topological dynamic identification. Background technique [0002] In recent years, the scale of my country's power grid has expanded, and the structure of the distribution network has become increasingly complex. At the same time, users have higher and higher requirements for power supply quality and reliability. In order to improve the quality and efficiency of emergency repairs, shorten the time for emergency repairs, and improve the reliability and service level of power supply, State Grid Corporation of China has vigorously promoted standardized emergency repairs and launched the construction of a distribution network production emergency repair command platform. Once the distribution network fails, it is necessary to carry out emergency repair work immediately to res...

AI Technical Summary

Problems solved by technology

However, in the traditional fault area location method, due to the complex structure of the distribution network and the low degree of automation of the electrical equipment in the distribution network, the fault area can only be determined by the method of switch trial operation, resulting in repeated actions of many switches, which seriously affects the distribution network. Repeatedly brought the impact of cold load, which may exceed the load limit of the feeder line; using the fault indicator in the low-voltage distribution network to locate the fault section can effectively determine whether there is a fault problem in the distribution network, and at the same time detect the fault Real-time monitoring of information ensures that an alarm will be issued immediately after a fault occurs. However, in some networks with many branches and complex lines, it is difficult to find faults, and it may even cause misjudgment of the fault area.

[0003] At present, the fault location method applied to the low-voltage distribution network also has some deficiencies. The matrix algorithm based on graph theory knowledge is one of the common fault location methods, but the complexity of matrix calculation often limits the efficiency of fault location; However, due to the large amount of power flow information, it takes a lot of time to process the fault location method. At the same time, some power flows are close to 0 during normal operation, making it difficult to judge whether there is a fault or not, which affects the accuracy of fault location.

[0004] For fault location, the existing technology has shortcomings such as insufficient positioning accuracy, fault information cannot be obtained in real time, and cannot meet the requirements of modern distribution network for power supply reliability, and the topological structure of distribution network often changes, which to a certain extent It also increases the difficulty of fault location

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