Method for identifying low-voltage distribution network topology and line impedance in station area

Abstract

The invention discloses a method for identifying a low-voltage distribution network topology and a line impedance in a station area, and belongs to the technical field of a low-voltage distribution network. The method comprises the steps of adding an edge computing terminal and a plurality of electrical measurement devices to the low-voltage distribution network in the station area firstly; when the low-voltage distribution network topology of the station area is identified each time, determining the affiliation relation of the station area of the measurement devices and a phase type of a communication access phase according to a power line carrier communication relation between the measurement device and the edge computing terminal, enabling each measurement device and the edge computingterminal to sample voltage and current waveforms after time synchronization and updating the voltage and current waveforms to the edge computing terminal, and enabling the edge computing terminal to identify the same bus-bar measurement device and an upper-level measurement device of the bus-bar according to the waveform data; and after the topology is identified multiple times, obtaining a finaltopology identification result and performing impedance calculation. According to the method for identifying the low-voltage distribution network topology and the line impedance in the station area disclosed by the invention, the accuracy rate for identifying the low-voltage distribution network topology and the line impedance is high, the speed is rapid, the information collection capability of the intelligent equipment of the low-voltage distribution network is fully exerted, the equipment cost is low and the method has no influence on power quality.

Description

technical field [0001] The invention belongs to the technical field of low-voltage distribution networks, and in particular relates to a low-voltage distribution network topology and a line impedance identification method in a station area. Background technique [0002] The topological relationship of the low-voltage distribution network in the station area is the basis for the development of intelligent business of the low-voltage distribution network in other station areas, which can help to solve various power grid services such as accurate determination of the power outage range and line loss statistics. With the construction of the smart grid, the switches, monitoring terminals and other equipment of the low-voltage distribution network in the Taiwan area are equipped with voltage and current collection and external communication capabilities. [0003] The low-voltage distribution network in the Taiwan area has the characteristics of wide distribution and complex topolo...

AI Technical Summary

Problems solved by technology

[0004] Obtaining the topology of the low-voltage distribution network in the station area manually is laborious and difficult to guarantee accuracy

[0005] By installing a power line carrier communication method at the meter, only the relationship between the user and the transformer, and the phase-splitting relationship of the user can be identified, and it is difficult to identify the branch relationship of the distribution box equipment in the low-voltage power distribution, the affiliation of the equipment, and the upstream and downstream relationship of the line

[0006] By injecting signals into low-voltage equipment, it can solve the branch relationship identification of low-voltage distribution network, but it has the disadvantages of high equipment cost and the impact of injected signals on power quality

[0007] Through the minute-level voltage and current effective value information of the operating equipment, the branch relationship of the low-voltage distribution network can be identified, but there are disadvantages of low accuracy and long time consumption

[0008] However, the existing low-voltage line impedance identification method is generally based on the existing topological information, but the topological relationship of the low-voltage station area is generally not available in the actual situation, so low-voltage line impedance identification cannot be carried out.

Moreover, the existing impedance identification method is mainly calculated based on the voltage, current effective value and power value collected by each node. Due to the lack of simultaneity in data collection, it is easy to cause a large error in the calculated line impedance due to some random interference factors.

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