A method, device and medium for evaluating the operation risk of DC grounding electrodes in power grids

By establishing a DC loop model and a grounding electrode excitation current surface potential diagram, the problems of large modeling workload and susceptibility to climate influence in existing technologies are solved, and a simple and reliable DC grounding electrode operation risk assessment for the power grid is provided to support the safe operation of the power grid.

CN118780227BActive Publication Date: 2025-10-03SHANGHAI UNIVERSITY OF ELECTRIC POWER
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Patent Information

Application Number
CN202410752505.7
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-06-12
Publication Date
2025-10-03
Estimated Expiration
2044-06-12

AI Technical Summary

Technical Problem

When assessing the operational risks of DC grounding electrodes in power grids, existing technologies require a large modeling workload and are easily affected by climate, making frequent updates difficult. This results in assessment results that are not simple and reliable.

Method used

By establishing a DC loop model, substations that are too close to the grid grounding point are screened out, and the high current risk, quantity risk, and average current risk under different working conditions are calculated. Combined with the grounding electrode excitation current surface potential diagram, the impact of the surface potential difference on the grid is verified, providing detailed risk assessment results.

Benefits of technology

It enables simple and reliable risk assessment, which can reflect the main risk factors of substations, support technicians to adjust working conditions or set suppression measures, and improve the reliability of safe operation of the power grid.

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Abstract

The present invention relates to a method, device, and medium for assessing the operational risk of DC grounding electrodes in a power grid. The method comprises the following steps: obtaining the connection relationship, distance, and maximum single-phase grounding current of each substation in the power grid; establishing a DC loop model; screening substations with distance risks from the DC loop model with the grounding point of the power grid as the center and a certain distance as the radius, as the first-stage risk assessment result; eliminating substations with distance risks, measuring DC currents under different operating conditions of each remaining substation in the power grid, calculating the average current, obtaining current data exceeding the maximum current and the corresponding number of substations; calculating the high current risk, quantity risk, and average current risk under each operating condition; and obtaining the second-stage risk assessment result under each operating condition. Compared with the existing technology, the present invention has the advantages of simple modeling parameters, high security, and high accuracy.
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