Complex harmonic detection and analysis method of four-spectral-line interpolation FFT based on five-item Rife-Vincent(I) window

A harmonic detection and analysis method technology, which is applied in the field of multiple complex harmonic detection in the power grid, can solve the problems of inability to reflect the measurement accuracy of weak amplitude parameters, inability to suppress interference well, and large harmonic signal amplitude parameters. , to achieve the effect of increasing speed, suppressing influence, and good side lobe performance

Inactive Publication Date: 2019-08-06
CHINA THREE GORGES UNIV
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Problems solved by technology

[0004] The patent literature (CN 105353215) proposes a harmonic detection method based on the Nuttall window four-line interpolation FFT. Since the sidelobe attenuation rate of the Nuttall window is small, it cannot well suppress the spectral leakage caused by the harmonic measurement. Interference, so the measurement ac

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  • Complex harmonic detection and analysis method of four-spectral-line interpolation FFT based on five-item Rife-Vincent(I) window
  • Complex harmonic detection and analysis method of four-spectral-line interpolation FFT based on five-item Rife-Vincent(I) window
  • Complex harmonic detection and analysis method of four-spectral-line interpolation FFT based on five-item Rife-Vincent(I) window

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[0056] The present invention relates to a complex harmonic detection and analysis method based on the four-spectral line interpolation FFT of the five-term Rife-Vincent (I) window, such as figure 1 Shown, the present invention mainly comprises following 5 steps:

[0057] (1): Carry out discrete sampling on a signal containing multiple complex harmonics, and then obtain a discrete sequence signal.

[0058] (2): Add five Rife-Vincent (I) windows to the discrete sequence signal sampled in step 1 to obtain a windowed discrete sequence signal.

[0059] (3): Discrete Fourier transform is performed on the windowed discrete sequence signal obtained in step 2 to obtain discrete harmonic signal spectrum values.

[0060] (4): For the harmonic signal spectrum value obtained in step 3, find four spectral lines near the peak points of each harmonic.

[0061] (5): For the four spectral lines near the peak point obtained in step 4, establish the four-spectrum spectral value relationship, ob...

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Abstract

A complex harmonic detection and analysis method of four-spectral-line interpolation FFT based on a five-item Rife-Vincent(I) window is disclosed. The method comprises the following steps of carryingout discrete sampling on a signal containing multiple complex harmonics to obtain a discrete sequence signal; adding the five-item Rife-Vincent(I) window to the sampled discrete sequence signal to obtain the discrete sequence signal with the window; carrying out a discrete Fourier transform on the obtained discrete sequence signal with the window to obtain a discrete harmonic signal spectrum value; according to the obtained harmonic signal spectrum value, finding four spectral lines near each harmonic frequency point; and according to the four spectral lines near the harmonic frequency point,establishing a spectrum relation of the four spectral lines, acquiring an offset between an actual spectral line value and a theoretical spectral line value, deriving a correction formula of a harmonic parameter, and then calculating the harmonic parameter after four-spectral-line interpolation correction. Compared with an existing power grid harmonic detection method, the method of the inventionhas better performance, and harmonic precision in the method of the invention is greatly increased.

Description

technical field [0001] The invention belongs to the technical field of detecting multiple complex harmonics of a power grid, and in particular relates to a complex harmonic detection and analysis method based on a four-spectrum line interpolation FFT of a five-term Rife-Vincent (I) window. Background technique [0002] Nowadays, with the rapid development of the power grid, various new equipments have been applied to the power grid one after another, especially the wide application of power electronic devices and the large increase of nonlinear loads, which make the voltage and current characteristics of the power system more and more complicated, and the harmonic pollution of electric energy is becoming more and more serious. Serious, it will endanger the security of the system. Therefore, accurate measurement of the harmonic content in the power grid can provide an effective scientific basis for the control of harmonics and maintain the safety of the system. At present, t...

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Application Information

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IPC IPC(8): G01R23/16
CPCG01R23/16
Inventor 李振华喻彩云胡廷和邾玢鑫李振兴杨楠徐艳春
Owner CHINA THREE GORGES UNIV
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