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Detection method of harmonic energy

A detection method and harmonic technology, applied in the field of harmonic power detection, can solve the problem of neglecting harmonic power research, and achieve the effects of ensuring operating costs, improving benefits, and reducing losses

Active Publication Date: 2012-07-25
SHANGHAI ELECTRIC POWER COMM +3
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Problems solved by technology

In the past, when detecting harmonics, only the total harmonic distortion rate of voltage, the content rate of each harmonic voltage and the allowable value of each harmonic current were analyzed, and the research on harmonic energy was ignored, so it was difficult to solve the above problems

Method used

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  • Detection method of harmonic energy
  • Detection method of harmonic energy

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Embodiment Construction

[0042] The present invention will be further described below in conjunction with accompanying drawing.

[0043] The present invention collects the total harmonic distortion rate of voltage, the content rate of each harmonic voltage and the allowable value of each harmonic current, obtains harmonic waveforms and harmonic power, and mainly obtains the 1-64th order of harmonic electricity by calculation And harmonic power and. The specific steps for calculating the 1-64th order of harmonic power to obtain the sum of harmonic power are as follows:

[0044] A. Filter the samples obtained at the sampling point; among them, the sampling point generally refers to the vicinity of the electric energy meter; sampling refers to the total harmonic distortion rate of voltage, the content rate of each harmonic voltage and the allowable value of each harmonic current;

[0045] B, perform FFT operation on the filtered samples; FFT refers to fast Fourier transform;

[0046] C, performing elec...

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Abstract

The invention discloses a detection method of harmonic energy, which is used for detecting harmonic waves and obtaining harmonic waveform and harmonic wave power. The detection method is also used for obtaining the total harmonic wave electric quantity by calculating the 1-64 times of harmonic wave electric quantities, and comprises the following steps: filtering samples obtained from sampling points; conducting FFT (fast Fourier transformer) calculation on the filtered samples; calculating the electric quantity according to the result obtained by FFT calculation; obtaining 1-64 times of harmonic wave electric quantities through calculation according to the result of the electric quantity calculation; and calculating and obtaining the total harmonic wave electric quantity according to the 1-64 times of harmonic wave electric quantities. According to the invention, the 1-64 times of harmonic wave electric quantities can be calculated, the total harmonic wave electric quantity also can be calculated, the calculation result has the important significance on whether the harmonic waves generated by a user can affect the electricity supply volume, and whether a multifunctional electric meter for measuring the electric energy of harmonic components is additionally loaded on the user is decided by measuring data, wherein the user generates the harmonic waves, but the harmonic waves do not surpass the rules of national standard 'GB / T14549-1933 Harmonics in public supply network of quality of electric energy', so that the line loss can be reduced.

Description

technical field [0001] The invention relates to a detection method of harmonic electric energy. Background technique [0002] With the development and wide application of urban rail transit, high-speed rail, and frequency conversion control technology, the nonlinear factors of grid load are getting higher and higher. Nonlinear loads will generate a large number of harmonics and inject them into the power grid, causing serious distortion of the voltage and current waveforms in the power system, which not only pollutes the power supply system, but also poses a hazard to the power supply equipment, and the nonlinear users that generate harmonics will absorb them A part of the fundamental wave electric energy is converted into harmonic electric energy, resulting in an increase in the line loss of the power supply enterprise and an increase in the non-operating cost of the electric power operation enterprise. For this reason, it is necessary to study the electric energy measurem...

Claims

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Application Information

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IPC IPC(8): G01R23/165G01R31/00G01R35/04
Inventor 陈明孙雁平汪舰
Owner SHANGHAI ELECTRIC POWER COMM
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