Instability pre-identification method for low-voltage switchgear

By fusing and weighting the active and reactive power characteristics of the dual incoming lines of the low-voltage switchgear, a power operation trajectory is constructed, which solves the problem that the existing technology cannot identify the dynamic deterioration trend of power under the dual incoming power line condition, and realizes the early warning of instability under the dual incoming line condition.

CN122815055APending Publication Date: 2026-09-25MINDIAN ELECTRIC CO LTD
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Patent Information

Application Number
CN202611274336.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-08-21
Publication Date
2026-09-25

AI Technical Summary

Technical Problem

Existing technologies cannot effectively identify dynamic power degradation trends under dual-power-input conditions, cannot identify and output confirmation signals in advance during the instability evolution process, and lack comprehensive characterization indicators and time windows for preventive intervention.

Method used

By acquiring the active and reactive power of the two incoming lines, guiding features and reactive branch features are generated. Weighted fusion is performed using fusion weights to construct the power operation trajectory. When the composite instability criterion is met for a preset number of consecutive times, a pre-instability confirmation signal is output.

Benefits of technology

It achieves accurate identification and early warning of dynamic power degradation trends under dual-input line conditions, and can identify the continuous power degradation trend from the overall dynamic evolution, avoiding the omission of the real degradation process due to single fluctuations or temporary normality.

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Abstract

The application is suitable for the technical field of low-voltage switch cabinet monitoring, and particularly relates to a low-voltage switch cabinet instability pre-identification method, which comprises the following steps: obtaining active power and reactive power at multiple sampling moments of two-way incoming lines; determining a first characteristic value according to the active power at the current sampling moment and the corresponding rated active power; determining a second characteristic value according to the active power difference and the reactive power difference; fusing the first characteristic value and the second characteristic value to generate a guide feature; determining a reactive branch feature as the ratio of the reactive power at the current sampling moment to the rated reactive power; determining the fusion weight of each incoming line according to the guide feature of each incoming line; generating synthetic active data and synthetic reactive data by using the fusion weights; constructing a power operation trajectory; and performing compound instability judgment on the power operation trajectory to output a pre-instability confirmation signal. Therefore, the method provided by the application can improve the problem that it is difficult to clearly determine the power dynamic deterioration trend and give a warning under the working condition of two-way power incoming lines.
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