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
CN109900959AActive Publication Date: 2019-06-18GUIZHOU POWER GRID CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
GUIZHOU POWER GRID CO LTD
Publication Date
2019-06-18

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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.
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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...

Claims

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