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A method and system for frequency measurement of electric power system

A power system and frequency measurement technology, which is applied in the direction of frequency measurement devices, frequency to phase shift conversion, etc., can solve the problems of large amount of calculation and complexity in anti-harmonic frequency measurement methods, achieve strong practical application value, and simple calculation methods , easy to promote the effect

Active Publication Date: 2021-07-13
XUJI GRP +2
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Problems solved by technology

[0006] The purpose of the present invention is to provide a power system frequency measurement method and system to solve the problem of large amount of calculation and complexity in the anti-harmonic frequency measurement method in the prior art

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  • A method and system for frequency measurement of electric power system
  • A method and system for frequency measurement of electric power system
  • A method and system for frequency measurement of electric power system

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Embodiment Construction

[0033] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and examples, but the embodiments of the present invention are not limited thereto.

[0034] Such as figure 1 Shown is the flow chart of the power system frequency measurement method of the present invention, and the method will be described in detail below.

[0035] First, collect the original sampling signal x of the power system 0 (n), using a low-pass filter for x 0 (n) Perform low-pass filtering to eliminate the high-frequency interference signal in the original signal of the power system, and obtain the low-frequency signal x(n) of the power system.

[0036] Then, perform sinusoidal Fourier calculation on the low-frequency signal x(n) of the power system to obtain the real part and imaginary part of the phasor at three moments with a difference of 1 / m cycle, ...

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Abstract

The present invention relates to a power system frequency measurement method and system. The method first performs low-pass filtering on the sampling signal of the power system to eliminate the high-frequency interference signal; then performs sinusoidal Fourier calculation on the obtained low-frequency signal to obtain a phase difference of 1 The phasor at three moments of the / m cycle to eliminate the influence of low-frequency harmonics, where m≥3; finally, the real-time frequency of the power system is obtained according to the method of phasor frequency measurement. The invention processes the low-frequency signal of the power system, and uses sinusoidal Fourier to eliminate the influence of low-frequency harmonics, so that the calculated frequency result of the power system is more accurate. Compared with the method used in the prior art, a large amount of iterative work is not required , the calculation method is relatively simple, reliable, easy to popularize, and has strong practical application value.

Description

technical field [0001] The invention belongs to the technical field of power system relay protection and control measurement, and in particular relates to a power system frequency measurement method and system. Background technique [0002] The concept of "frequency" originates from the classic physical definition of periodically changing things. Since many physical variables in the power system have periodic characteristics, this concept has been widely used in electrical technology. On the one hand, power system frequency, as an index to measure power quality, needs to be dynamically monitored; on the other hand, as an important state feedback quantity for implementing safety and stability control, it is required to be able to be reconfigured in real time. Therefore, accurate frequency measurement is of great significance to the stable and safe operation of the power system. [0003] The essence of frequency measurement is the identification of dynamic parameters of the s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R23/12
CPCG01R23/12
Inventor 龚赟王莉邓茂军胡叶宾樊占峰姚武姚为正程天保冯秋芳王智勇黄继东赵晓铎许圣龙王志伟张哲茹东武
Owner XUJI GRP
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