APF harmonic detection method based on spectrum leakage correction algorithm

A correction algorithm and harmonic detection technology, applied in the direction of spectrum analysis/Fourier analysis, etc., can solve problems such as increased calculation amount or complex algorithm, spectral leakage of input signal, limited effect of window function, etc. effect achieved

Active Publication Date: 2017-10-20
HENAN POLYTECHNIC UNIV
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Problems solved by technology

[0007] The root cause of spectrum leakage caused by Fourier transform for spectrum analysis is that the input signal cannot accurately and completely represent the analyzed signal, and an error occurs in the output. Although this error can be solved by adding a suitable window function or extending the time as described abo

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  • APF harmonic detection method based on spectrum leakage correction algorithm
  • APF harmonic detection method based on spectrum leakage correction algorithm
  • APF harmonic detection method based on spectrum leakage correction algorithm

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Embodiment 1

[0085] Based on the above theoretical analysis, the preferred embodiments of the present invention are described in detail, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, so as to define the protection scope of the present invention more clearly.

[0086] A method for detecting APF harmonics based on a spectrum leakage correction algorithm, comprising:

[0087] The entire period signal truncation length N value acquisition, the specific implementation steps are as follows:

[0088] ① Divide the harmonic spectrum frequency segment into multiple sub-bands according to the fundamental frequency range and harmonic order;

[0089] ② Determine the range of the signal truncation length N according to the sampling frequency and frequency band;

[0090] ③ Window processing is performed on the signal to be analyzed;

[0091] ④ Perform DFT on the windowed signal;

[0092] ⑤Change the N value, repeat ③④, and make ...

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Abstract

The invention discloses an APF harmonic detection method based on a spectrum leakage correction algorithm. Based on the traditional discrete Fourier transform, the method uses the signal truncation length as an independent variable, extends the classical one-dimensional amplitude spectrum into two dimensions, provides a new way for signal spectrum characterization, and adopts a spectrum leakage correction algorithm based on the minimum error to achieve accurate estimation of the frequency, amplitude and phase. Compared with the prior art, the method of the invention obtains N closest to the integral cycle truncation through the two-dimensional spectrum, on this basis, obtains approximate accurate estimates of the signal frequency, amplitude and phase based on the minimum error theory by taking the spectral value constructed by sinc as a real spectrum, and has the advantages of small error and easy implementation.

Description

technical field [0001] The invention relates to the technical field of harmonic detection, in particular to an APF harmonic detection method based on a spectrum leakage correction algorithm. Background technique [0002] APF detects the fundamental reactive current, negative sequence current and harmonic current required by the load, and controls the inverter output to track the detected current, so as to achieve comprehensive compensation for load reactive power. The detection method of the compensation command current determines the detection accuracy of the harmonic current, which in turn affects the current compensation effect. Therefore, harmonic detection technology has always been the key research content in the field of harmonic compensation, and the research on compensation command current detection method mainly revolves around two aspects of detection speed and accuracy. [0003] At present, the detection methods of compensating command current are mainly detecti...

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Application Information

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IPC IPC(8): G01R23/16
CPCG01R23/16
Inventor 黄凯征钱伟曾志辉李新伟刘群坡
Owner HENAN POLYTECHNIC UNIV
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