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Harmonic power calculating method for electric energy measuring

A technology of harmonic power and calculation method, which is applied in the direction of electric power measurement by applying digital technology, can solve the problems of inaccurate acquisition, large calculation amount, large error, etc., and achieves the effect of reduced calculation amount, high precision and easy realization.

Inactive Publication Date: 2013-03-27
SHANGHAI BEILING
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0007] It is necessary to calculate the effective value of the voltage and current and the phase of the voltage and current first, which requires a large amount of calculation, especially the calculation of the phase, which cannot be obtained accurately, but is obtained by mathematical approximation, and the error is relatively large

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  • Harmonic power calculating method for electric energy measuring
  • Harmonic power calculating method for electric energy measuring
  • Harmonic power calculating method for electric energy measuring

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with accompanying drawing.

[0025] DFT operation (butterfly operation) calculation formula: X ( k ) = Σ n = 0 N - 1 x ( n ) W N nk , k , n = 0,1 , . . . , N - 1 , in:

[0026] N is a positive integer, X(k) represents the kth value of the DFT operation result, Represents the twiddle factor, j represents the imaginary unit (j 2 =-1), e represents the natural exponent (e≈2.7182818, infinite non-recurring decimals);

[0027] The FFT calcula...

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Abstract

The invention discloses a harmonic power calculating method for electric energy measuring. The harmonic power calculating method includes: performing fast Fourier transform (FFT) on the synchronously input voltage and current sampling current to obtain values of harmonic components, and obtaining active power and inactive power of the harmonics through special formula on the basis of the harmonic components. The whole computing process adopts a pipeline digital processing unit, and compared with a traditional harmonic power calculating method, the harmonic power calculating method is simple, less in computing by adopting a pipeline system and accurate in computing results.

Description

technical field [0001] The invention relates to the field of electric energy metering, in particular to a method for calculating harmonic power for electric energy metering. Background technique [0002] In the power grid, with the continuous increase of frequency conversion equipment and nonlinear equipment, the voltage is not a single frequency, but more and more high-frequency components are mixed, and these high-frequency components will have a serious impact on other equipment in the power grid. When the high-frequency components reach a certain level, serious harm may occur. Therefore, the control of high-frequency components in the power grid is becoming more and more important, and the measurement of harmonic components in the power grid is also paid attention to accordingly. [0003] FFT (Fast Fourier Transform) is commonly used in power grid harmonic measurement. The value of each harmonic component is obtained through FFT transformation, and then various character...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R21/133
Inventor 沈祥韩明
Owner SHANGHAI BEILING
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