Harmonic analysis method

A harmonic analysis and fundamental wave technology, applied in the field of high-precision harmonic analysis, can solve the problems of low accuracy of analysis results, difficulty in synchronous sampling and long-range leakage in harmonic analysis

Active Publication Date: 2012-03-28
路亚科消防车辆制造有限公司
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Problems solved by technology

[0005] In engineering applications, harmonic analysis always performs limited sampling and it is difficult to achieve strict synchronous sampling
In this way, when quasi-synchronous DFT is used for harmonic analysis, there will be long-range leakage due to the truncation effect and short-range leakage due to the fence effect, making the analysis results inaccurate and even unreliable

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Embodiment Construction

[0028] A kind of high-precision harmonic analysis technology of the present invention comprises the following steps:

[0029] First, W+2 sampling points are sampled at equal intervals to obtain a discrete sequence {f(k), k=0, 1, . . . , w+1} of the analyzed signal. W is determined by the integration method, the number of iterations n and the number of sampling points N in the ideal period. Equal interval sampling refers to determining the sampling frequency f according to the frequency f of the ideal signal for harmonic analysis (for example, the frequency of the power frequency signal is 50Hz, and the period is 20mS). s = Nf, at sampling frequency f s Under the action of , uniformly sample N points in one cycle. Generally, a better harmonic analysis result can be obtained when periodic sampling points N=64 or more, and a better harmonic analysis result can be obtained when the number of iterations n=3-5. Integral methods include complex trapezoidal integral method W=nN, co...

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Abstract

The invention discloses a high-precision harmonic analysis method improved on the basis of quasi-synchronous discrete Fourier transformation (DFT). The method comprises the step: changing the position of a frequency domain sample according to the drift of signal frequency when harmonic analysis is performed by applying the quasi-synchronous DFT, wherein the position of the frequency domain sample is mu2pi/N, and mu is the drift of the signal frequency, and mu is equal to 1 when the signal frequency does not have the drift. The harmonic analysis method disclosed by the invention comprises thinking: a variable barrier, i.e. the position of the frequency domain sample is changed according to the drift of the signal frequency when the harmonic analysis is performed. The technology disclosed by the invention is beneficial to more accurately obtaining the information, such as the amplitudes, the initial phase angles, the frequencies and the like of all harmonics in the fields of applying the harmonic analysis, such as the fields of power quality monitoring, electronic product production inspection, electric equipment monitoring and the like.

Description

technical field [0001] The invention relates to a high-precision harmonic analysis method. Background technique [0002] Harmonic analysis technology is widely used in many fields such as power quality monitoring, electronic product production inspection, and electrical equipment monitoring. It is an important technical means for power grid monitoring, quality inspection, and equipment monitoring. Currently, the most widely used techniques for harmonic analysis are discrete Fourier transform (DFT) and fast Fourier transform (FFT). The harmonic analysis technology combining quasi-synchronous sampling technology and DFT technology can improve the accuracy of harmonic analysis, and its formula is: [0003] a k = 2 F ak n = ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R23/16
Inventor 傅中君
Owner 路亚科消防车辆制造有限公司
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