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Fourier algorithm-based power system frequency measuring method

A power system and frequency measurement technology, which is applied in frequency measurement devices, frequency-to-phase shift conversion, spectrum analysis/Fourier analysis, etc., can solve the problems that the calculation accuracy and calculation speed cannot be well unified, and the method is ingenious Reliable, high calculation accuracy and fast calculation speed effect

Inactive Publication Date: 2018-07-27
NANJING FENGDAO POWER TECH
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the existing power system frequency measurement, the problem that the calculation accuracy and the calculation speed cannot be well unified

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  • Fourier algorithm-based power system frequency measuring method
  • Fourier algorithm-based power system frequency measuring method
  • Fourier algorithm-based power system frequency measuring method

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Embodiment Construction

[0039] Below in conjunction with accompanying drawing, the present invention will be further described.

[0040] The power system frequency measurement method based on the Fourier algorithm of the present invention can realize the extraction of the fundamental wave component from the voltage or current input signal polluted by interference, and use the change of the phase angle to calculate and measure the voltage or current by using the Fourier transform principle. The frequency of the current input signal, combined with the sampling values ​​of two sampling periods, can be calculated to obtain the frequency change value Δf, so as to obtain the measured frequency value, and then perform effective and fast numerical averaging on the calculated measured frequency value to perform frequency correction. The measurement frequency with high precision can be obtained, the method is ingenious and reliable, the calculation precision is high and the calculation speed is fast, specifical...

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Abstract

The invention discloses a Fourier algorithm-based power system frequency measuring method. The method adopts the Fourier transform principle to extract a fundamental wave components from a voltage / current input signal subjected to interference pollution. Meanwhile, based on the change of a phase angle, the frequency of the voltage / current input signal is measured. The frequency change value can beobtained through calculation based on the sampling values of two sampling periods, so that a measured frequency value can be obtained. After that, the effective and fast numerical averaging is carried out on the calculated measured frequency value, and then the frequency correction is carried out. In this way, the measurement frequency with higher precision can be obtained. The method is ingenious and reliable. The method is high in calculation precision and fast in calculation speed is fast. The method has a good application prospect.

Description

technical field [0001] The invention relates to the technical field of power system frequency measurement, in particular to a power system frequency measurement method based on Fourier algorithm. Background technique [0002] Power system frequency is one of the important power quality indicators. Frequency is an important parameter that reflects the operating characteristics of the power system. By timely and accurately measuring the frequency, it can be predicted whether the power system will lose stability, so as to ensure the safe operation of the system through machine and load shedding control. For power system frequency monitoring and control, its measurement error reaches 0.01Hz, which should basically meet the requirements. For the application of new technologies in power systems, accurate frequency measurement results are required as reference values. At present, the usual means of measuring the frequency of power systems is to detect the zero-crossing point of th...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R23/12G01R23/16
CPCG01R23/12G01R23/16
Inventor 孙召田王峰刘家严邵先锋蔡德胜陈有才
Owner NANJING FENGDAO POWER TECH
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