Power system frequency measurement method and device

A frequency measurement and power system technology, applied in frequency measurement devices and other directions, can solve the problem that the frequency value is not very accurate, and achieve the effect of high frequency measurement accuracy and good anti-noise interference.

Active Publication Date: 2017-02-15
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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Problems solved by technology

However, the research results show that the frequency value measured by this method is not very accurate in the presence of noise interference

Method used

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  • Power system frequency measurement method and device
  • Power system frequency measurement method and device
  • Power system frequency measurement method and device

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Embodiment Construction

[0025] The specific implementation of the power system frequency measurement method of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0026] Such as figure 1 As shown, a power system frequency measurement method, comprising steps:

[0027] S110. Measure the frequency of the input signal to obtain a reference frequency;

[0028] S120. Perform proportional operation and integral operation on the input signal respectively, to obtain a proportional operation output signal and an integral operation output signal;

[0029] S130. Perform amplitude detection on the proportional operation output signal to obtain a first amplitude detection signal, and perform amplitude detection on the integral operation output signal to obtain a second amplitude detection signal;

[0030] S140. Determine a ratio between the first amplitude detection signal and the second amplitude detection signal, and obtain a frequency measurement value of ...

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Abstract

Disclosed is a power system frequency measuring method and device. The method includes the steps of measuring frequency of an input signal to obtain a reference frequency; subjecting the input signal to scaled operation and integral operation to obtain a scaled operation output signal and an integral operation output signal; subjecting the scaled operation output signal to amplitude detection to obtain a first amplitude detection signal, subjecting the integral operation output signal to amplitude detection to obtain a second amplitude detection signal; determining a ratio of the first amplitude detection signal to the second amplitude detection signal, and acquiring a frequency measured value of the input signal according to a product of the ratio and the reference frequency. The power system frequency measuring method and device has the advantages that low frequencies can be measured highly precisely, noise resistance in low frequency measurement is good, and the method and the device have important uses and reference value in power scientific research, measurement of power system frequency and calibration and development of power instruments.

Description

technical field [0001] The invention relates to the technical field of frequency measurement, in particular to a power system frequency measurement method and device. Background technique [0002] In modern power engineering practice, various strategies and algorithms are continuously produced. Specific to power system frequency measurement, various frequency measurement algorithms have been produced, such as zero-crossing method, algorithm based on filtering, algorithm based on wavelet transform, algorithm based on neural network, etc. Modern electric power scientific research, the development of high-precision electric power instruments, and the application of a large number of new technologies have put forward higher and higher requirements for frequency, especially low frequency measurement accuracy. [0003] The rated power frequency of power grid operation is 50Hz (Hertz), which is a relatively low frequency. From a control point of view, a frequency measurement accu...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R23/02
Inventor 李军旁志强万文军
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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