A method and system for determining the start of an emergency control of a wideband oscillation with an inverse time characteristic

By using a broadband oscillation emergency control initiation discrimination method with inverse time-limit characteristics, the power grid electrical signals are acquired in real time, the cumulative risk value is calculated, and an emergency control initiation signal is generated. This solves the problem in existing technologies that cannot distinguish between short-term large-amplitude and long-term small-amplitude damage, and achieves accurate identification and control of broadband oscillations, ensuring the safety of the power system.

CN122246753APending Publication Date: 2026-06-19STATE GRID ELECTRIC POWER RES INST +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
STATE GRID ELECTRIC POWER RES INST
Filing Date
2026-03-18
Publication Date
2026-06-19

AI Technical Summary

⚠Technical Problem

The existing broadband oscillation emergency control activation criteria cannot effectively distinguish between the damage differences of "short-term large amplitude" and "long-term small amplitude", resulting in slow action or false action. It cannot adapt to the characteristics of complex broadband oscillation amplitude changes and significant cumulative effects of equipment damage, thus threatening the safety of the power system.

⚗Method used

An emergency control initiation discrimination method based on inverse time-limited characteristics is adopted. By acquiring the power grid electrical signal in real time, the dominant frequency and characteristic quantity of each broadband oscillation are extracted, the speed threshold value and standardized over-limit value are calculated, and the risk accumulation value is calculated using the inverse time-limited initiation logic unit to generate an emergency control initiation signal.

🎯Benefits of technology

It achieves accurate identification and control of wideband oscillations, avoids malfunctions, ensures rapid cut-off during large-amplitude oscillations to prevent equipment damage, has strong adaptability, dynamically changes response time to meet equipment tolerance, and is easy to use in engineering.

✦ Generated by Eureka AI based on patent content.

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Abstract

This invention discloses a method and system for determining the emergency control activation of broadband oscillations based on inverse-time characteristics. The method includes: acquiring electrical signals at target locations in the power grid in real time; extracting the dominant frequency and characteristic quantities representing the intensity of broadband oscillations in each frequency band; calculating whether the characteristic quantities of each frequency band exceed a preset speed threshold value for that frequency band; if a characteristic quantity of a frequency band exceeds the corresponding speed threshold value at any time, an emergency control activation signal is generated for that frequency band; calculating the standardized excess amount of the characteristic quantities of each frequency band that do not exceed the speed threshold value relative to a preset reference threshold value for that frequency band, and inputting it into the corresponding inverse-time activation logic unit to calculate the risk accumulation value of the corresponding frequency band; when the risk accumulation value of any frequency band exceeds the preset risk action threshold value for that frequency band, an emergency control activation signal is generated for that frequency band. This invention can quickly and accurately identify the broadband oscillation state of the power grid and trigger emergency control measures based on inverse-time characteristics.
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