Low-voltage transformer area topology identification method based on power line carrier attenuation characteristics

Abstract

The invention provides a low-voltage transformer area topology identification method based on power line carrier attenuation characteristics. The physical connection relationship between nodes is judged by utilizing the attenuation characteristic of a power line carrier signal and a step-by-step sending strategy of a power line carrier signal of a topology identification device, and the automaticidentification of the physical topology of the low-voltage distribution network can be realized without injecting a high-power or high-frequency signal into a power grid or a large amount of manual intervention; the manpower and material resource cost is saved, and the influence of judgment of the physical connection relationship between the nodes on the working stability of the power grid is avoided.

Description

technical field [0001] The invention relates to the technical field of operation management of a low-voltage distribution network, in particular to a topology identification method of a low-voltage station area based on the attenuation characteristics of a power line carrier. Background technique [0002] The topological relationship of the low-voltage station area is the basis for professional management such as power distribution operation, emergency repair, marketing, and metering. The topology of the low-voltage station area of ​​the distribution network consists of distribution transformers - low-voltage outlets - low-voltage switch combinations (low-voltage power distribution cabinets or low-voltage switchgears) - branch lines - meters - until user equipment. It includes geographical information, user information, connection relationship and routing status of various low-voltage electrical equipment passing along the way, and exists in the form of distribution transfor...

AI Technical Summary

Problems solved by technology

At present, there are mainly two implementation methods. One is to add a special signal to one end of the low-voltage cable core that needs to be identified, and install the supporting signal receiver on the other end of the target cable that needs to be identified to detect whether it can receive the signal. The other is based on the principle of electromagnetic induction, and a signal transmitter is installed outside the target cable that needs to be identified. Because of electromagnetic induction, a special signal can be induced on the metal armor of the cable. Install a supporting signal receiver at the other end of the target cable to detect whether it can receive this special signal, and then the identification can be realized. However, the price of the equipment in this method is too high, and the one-time investment is very large, so it is not easy to use on a large scale

[0008] Problems existing in the current low-voltage power distribution system: the basic information of the low-voltage distribution network is incomplete, resulting in a mismatch between the archive data and the actual physical line topology; users privately connect the power lines, especially at the junction of the low-voltage distribution network, which is likely to cause crossover , aggravating the confusion of the low-voltage distribution network lines; the cutting of the station area or the change of the load, etc. did not update the record data in time

[0009] The existing low-voltage topology identification technology needs to rely on complex high-power equipment, expensive instruments and a lot of manpower to complete, which will have a certain impact on the normal operation of the power grid, and the economic cost is relatively high

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