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Method for extracting harmonic components in dynamic sinusoidal distortion signal

A technology of harmonic components and extraction methods, applied in the field of dynamic signal testing and analysis, to achieve the effects of improving harmonic resolution and anti-noise capabilities, suppressing spectral leakage, and improving accuracy and stability

Active Publication Date: 2019-06-18
GUIZHOU POWER GRID CO LTD
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method for extracting harmonic components in a dynamic sinusoidal distortion signal to solve the problem of suppressing the spectrum leakage generated when the sinusoidal distortion signal undergoes Fourier transform, thereby improving the harmonic content of the dynamic sinusoidal distortion signal. Accuracy of wave component extraction

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  • Method for extracting harmonic components in dynamic sinusoidal distortion signal
  • Method for extracting harmonic components in dynamic sinusoidal distortion signal
  • Method for extracting harmonic components in dynamic sinusoidal distortion signal

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Embodiment Construction

[0032] The solution proposed by the present invention is: use a new convolution window to weight the discretized sinusoidal distortion signal, perform discrete Fourier transform on the weighted signal to obtain a discrete spectrum, and correct the spectrum through an adaptive energy center of gravity algorithm according to the harmonic order Coefficients, to suppress the spectrum leakage, so as to accurately extract the frequency and amplitude of the harmonic components in the sinusoidal distortion signal, specifically including the following steps:

[0033] Step a. Determine the data length N and sampling frequency f for Fourier transform s ;

[0034] Step b. Take the weight coefficient of the cosine item as 0.44, 0.51, 0.05, construct a second-order cosine combination window, and perform time-domain self-convolution on the obtained second-order cosine combination window to obtain a new type of second-order cosine combination self-convolution window w( n);

[0035] Step c. ...

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Abstract

The invention discloses a method for extracting harmonic components in a dynamic sinusoidal distortion signal. The method comprises: determining a data length N and a sampling frequency for performingFourier transform; constructing a second-order cosine combining window to obtain a novel second-order cosine combined self-convolution window; acquiring a weighted sinusoidal distortion signal; carrying out discrete Fourier transform with the data length of N on the weighted sinusoidal distortion signal to obtain a spectral function; searching for the spectral function, searching peak spectral lines in the frequency range, marking the peak spectral lines; according to the harmonic order, calculating additional spectral lines numbers required by correcting all peak spectral lines; according tothe additional spectral line of the m-th harmonic, correcting the peak spectral lines and calculating a corrected accurate frequency; and on the basis of the calculated m-th harmonic frequency, calculating a correction amount of the harmonic spectral line and acquiring the amplitude of the m-th harmonic component in the sinusoidal distortion signal. Therefore, the accuracy of the harmonic component extraction in the dynamic sinusoidal distortion signal is improved.

Description

technical field [0001] The invention belongs to the field of dynamic signal testing and analysis, in particular to a method for extracting harmonic components in dynamic sinusoidal distortion signals. Background technique [0002] Sinusoidal signal is a signal with the most single frequency component, which is widely used in communication, power transmission, industrial automatic control, ultrasonic flaw detection and other fields. However, in the actual system, due to the influence of noise, transmission impedance, etc., the sinusoidal signal often has a certain degree of distortion. Taking the power system as an example, with the continuous increase of various types of nonlinear loads (high-power rectifier equipment, converter equipment, electric arc furnaces, electrified railways, and household appliances, etc.) in the power system, the voltage and current sinusoidal waveforms in the power system Distortion is becoming more and more serious. Therefore, the accurate extr...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R23/16
Inventor 张俊玮温和张秋雁欧家祥单铉昇张博古庭赟牛唯安甦吴冕之孙航王扬王蓝苓胡厚鹏李航锋姚青刘鹏
Owner GUIZHOU POWER GRID CO LTD
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