Transformer area switch physical topology identification method based on power grid total data acquisition

Abstract

The invention discloses a transformer area switch physical topology identification method based on power grid total data acquisition. The method comprises the following steps: step 1, data acquisition; step 2, data initialization: taking an electric quantity curve as data generated by initial topology; step 3, data sorting; step 4, grouping of direct connection branches; step 5, branch topology generation and verification; step 6, determination of a superior-subordinate relationship of the direct connection points; and step 7, re-verification of the physical topological relation. Compared with a scheme of generating a disturbance signal and a scheme of adopting a low-current pulse signal in the market, the identification method has the following advantages: the power consumption is low, and the risk of equipment burning caused by untimely heat dissipation is avoided; data carried by the equipment is adopted for analysis, and the scheme cost is low; no harmonic wave is injected into the power grid, no interference is generated on equipment of the power grid, timing starting is not needed, and efficiency is high.

Description

technical field [0001] The invention relates to the technical field of station area switch topology, in particular to a method for identifying the physical topology of station area switches based on full data collection of power grids. Background technique [0002] The physical topological relationship of switches in the low-voltage distribution network is the basis for realizing distribution automation. In the process of construction, expansion, replacement and inspection of smart substations, changes in switchgear in the distribution network will lead to changes in the topological relationship of switches in the station area. In order to improve the reliability of power supply, shorten the time for handling accidents, reduce the scope of power outages, and reduce operation and maintenance costs, it is necessary to grasp the network topology relationship of "transformer-branch box-meter box" in the entire station area in real time. [0003] At present, the network topology...

AI Technical Summary

Problems solved by technology

[0004] 1) The topological data left during the construction of the station area. In this way, manual entry of files is required during the initial installation, and the workload is huge. In the later stage, if there is equipment replacement or line change, manual entry and update are also required.

In actual use, there are often entry errors or untimely update files, resulting in inconsistencies between the actual distribution network topology and the main station display

[0005] 2) The scheme (disturbance) that generates a large current near the zero-crossing point is adopted. Due to the continuous occurrence of disturbance signals, the current generated by this scheme is relatively large and the heat cannot be dissipated. The direct reason is that it can be piloted in a small area but cannot be really promoted. In addition, due to the use of high-speed DSP for current sampling, the equipment price is relatively high;

[0006] 3) The small current characteristic pulse signal scheme is adopted. During the identification process, the scheme needs to continuously generate small currents on the power line, which brings a great noise impact to the power grid and affects the operation of the user's precision equipment, and Continuous load will continue to consume grid power, which is also a waste

Due to the small identification current, it is easy to be overwhelmed by the original current load on the line, and the identification rate is low

[0007] 4) The load current scheme of the power supply network is adopted, which relies on the high accuracy of current sampling and high consistency of sampling time of all low-voltage power grid equipment, and the on-site recognition effect is poor

Images