Power system frequency measurement method and system

A power system and frequency measurement technology, which is applied in the direction of frequency measurement device, frequency to phase shift conversion, etc., can solve the problems of complex and anti-harmonic frequency measurement method with large amount of calculation, etc., and achieve simple calculation method and strong practical application value , The effect of accurate frequency results

Active Publication Date: 2019-01-04
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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  • Power system frequency measurement method and system
  • Power system frequency measurement method and 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 invention relates to a power system frequency measurement method and system. Firstly, the sampling signals of the power system are subjected to low pass filtering, and the high-frequency interference signals are eliminated; the obtained low-frequency signals are subjected to sinusoidal Fourier calculation, and phasors of three moments with a difference of a 1/m cycle are obtained to eliminatethe influence of low-frequency harmonics, and m is no smaller than 3; and finally, according to a phasor frequency measurement method, the real-time frequency of the power system is obtained. The low-frequency signals of the power system are processed, the sinusoidal Fourier is used to eliminate the influence of low-frequency harmonics, the frequency result of the power system which is obtained through calculation is more accurate, and in comparison with the method used in the prior art, a lot of iteration work is not needed, the calculation method is simple and reliable, popularization is easy, and the practical application value is strong.

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 Applications(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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