Method and device for measuring the instantaneous frequency of an electric power system

By measuring the internal potential and frequency at the generator, and combining power flow calculation and frequency division matrix, a frequency division relationship matrix of the power system is constructed. This solves the problem of insufficient accuracy of frequency division relationship in the existing technology, and realizes accurate calculation of the instantaneous frequency of each node of the power system without adding equipment, thereby reducing costs and improving adaptability.

CN122131012APending Publication Date: 2026-06-02HUAZHONG UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HUAZHONG UNIV OF SCI & TECH
Filing Date
2026-03-30
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Existing technologies, when calculating the instantaneous frequency of each node in a power system, either lack sufficient accuracy in frequency division relationships or require additional expensive frequency measurement devices, making it difficult to effectively estimate frequency dynamics.

Method used

By measuring the internal potential amplitude and frequency at the generator, and combining power flow calculation and frequency division matrix, a frequency division relationship matrix of the power system is constructed, the instantaneous frequency of the target node is calculated, and data is obtained using existing generator measurement modules and controllers, eliminating the need for additional frequency measurement devices.

Benefits of technology

It enables accurate calculation of the instantaneous frequency of each node in a power system without adding additional measuring devices, reducing costs and is applicable to systems with similar frequency and voltage dynamics on similar time scales, demonstrating strong adaptability.

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Abstract

This invention discloses a method and apparatus for measuring the instantaneous frequency of a power system, belonging to the field of power system safe operation. It includes: acquiring the measured voltage, measured current, and reference angular frequency of a generator; calculating the generator's active and reactive power and internal potential amplitude frequency; determining whether the rate of change of the generator's internal potential instantaneous frequency exceeds a frequency change threshold; constructing a frequency division relationship matrix; and calculating the instantaneous frequency of the target node after a frequency event occurs. This invention solves the problems of existing frequency division relationships being too simple, lacking accuracy, and difficult to apply to power systems with large-scale grid integration of new energy sources, and reduces the high cost of installing frequency measurement devices to obtain the frequency response of network nodes. It has good system condition adaptability and measurement economy.
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