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High-accuracy non-integer-period sampled harmonic analysis and measurement method

A periodic sampling and harmonic analysis technology, applied in the field of signal measurement, can solve problems such as limited accuracy

Active Publication Date: 2010-12-01
中国航天科技集团公司第五研究院第五一四研究所
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Problems solved by technology

These methods have limited accuracy because they ignore leakage at negative frequencies and windowing cannot minimize long-range leakage
The accuracy of the results obtained by existing measurement methods is about 10 -5 ~10 -4 between

Method used

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  • High-accuracy non-integer-period sampled harmonic analysis and measurement method
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  • High-accuracy non-integer-period sampled harmonic analysis and measurement method

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Embodiment Construction

[0066] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0067] Such as figure 1 Shown flow chart, the specific steps of the high-accuracy harmonic measurement method of the present invention are as follows:

[0068] First of all, it is necessary to use the data acquisition system to sample the input measured harmonic signal (that is, the measured signal containing harmonics) to obtain N sampling samples, N is a natural number, f s is the sampling frequency.

[0069] Then discrete Fourier transform (DFT) or fast Fourier transform (FFT) is performed on the collected N sampling samples to obtain the discrete frequency spectrum of the measured signal.

[0070] The third step is to select K+1 spectral lines from the discrete spectrum, and the rules for selecting spectral lines are:

[0071] K is a natural number greater than 1, and the value of K is the sum of the number of fundamental waves and th...

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Abstract

The invention provides a harmonic measurement method which aims at obtaining a high-accuracy harmonic measurement result. The method comprises the following steps: sampling a signal to be measured; carrying out DET or FFT treatment on the sampling result to obtain a discrete spectrum; and selecting a plurality of measurement errors caused by spectral line revising long-range spectrum leakage, short-range spectrum leakage, negative frequency point leakage and the like from the discrete spectrum to obtain the high-accuracy harmonic measurement result. The method of the invention can be applied to the field of accurate harmonic measurement.

Description

technical field [0001] The invention relates to a signal measurement method, in particular to a signal measurement method containing harmonic components. Background technique [0002] With the widespread use of nonlinear loads such as power electronic devices and semiconductor devices, harmonic pollution in power systems is becoming more and more serious. In order to ensure the quality of power and the safe operation of the power system, harmonics should be accurately detected and analyzed, so as to provide a more scientific basis for harmonic control. In addition, a variety of harmonic measuring instruments have emerged at home and abroad. In order to ensure the unity of the values ​​of these instruments, it is also necessary to study high-accuracy harmonic measuring methods. [0003] Digital signal processing methods for harmonic measurement include correlation analysis, fast Fourier transform (FFT) based on discrete Fourier transform (DFT), wavelet transform, neural netw...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R23/16
Inventor 金海彬吴静郝婷婷
Owner 中国航天科技集团公司第五研究院第五一四研究所
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