A method and system for determining power system disturbance category

By calculating the frequency change rate after the power system disturbance and establishing a simplified frequency response model, distinguishing the category of power system disturbances, the problem that the frequency defense line cannot distinguish short-term disturbances is solved, and the safety and stability of the frequency is achieved.

CN117147993BActive Publication Date: 2025-08-12CHINA ELECTRIC POWER RESEARCH INSTITUTE CO LTD +3
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Patent Information

Application Number
CN202310917929.X
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-07-25
Publication Date
2025-08-12
Estimated Expiration
2043-07-25

AI Technical Summary

Technical Problem

The existing frequency defense line is mainly designed for long-term step disturbances, and cannot effectively distinguish and deal with short-term power disturbances such as high/low penetration and DC commutation failure of new energy, resulting in frequency over-regulation after the disturbed power is restored, threatening the system frequency safety.

Method used

By obtaining the operating data after the power system disturbance, calculating the frequency change rate and the critical frequency change rate, establishing a simplified system frequency response model, calculating the disturbance power and distinguishing the categories of power system disturbances, distinguishing between short-term and long-term disturbances, and avoiding frequency over-regulation.

Benefits of technology

Effectively distinguish short-term and long-term disturbances, avoid frequency over-adjustment caused by short-term disturbance recovery, and ensure the safety and stability of the system frequency.

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Abstract

The present invention discloses a method and system for distinguishing the type of power system disturbance, which belongs to the technical field of power systems. The method of the present invention includes: calculating the frequency change rate at the start moment after the power system disturbance and the critical frequency change rate after the power system disturbance; calculating the frequency change rate at the power recovery moment after the power disturbance; calculating the disturbance power after the power system disturbance based on the calculation formula of the disturbance power; bringing the disturbance power into the system frequency response model, calculating the frequency change rate threshold at the critical moment, and distinguishing the type of power system disturbance based on the frequency change rate threshold at the critical moment. The present invention can effectively distinguish short-term disturbances from long-term disturbances. In the event of a short-term disturbance, the frequency defense line is locked to avoid the frequency overmodulation problem caused by the action of the frequency defense line after the short-term disturbance is restored, thereby ensuring the safety and stability of the system frequency.
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