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A Method of Suppressing Current Harmonic Based on Fast Fourier Transform

A technology of Fourier transformation and suppression of current, applied in AC network to reduce harmonic/ripple, harmonic reduction device, spectrum analysis/Fourier analysis, etc., can solve the problem of large error, difficult design, and inability to obtain harmonic amplitude Questions like value and phase information

Active Publication Date: 2019-01-04
LEIHUA ELECTRONICS TECH RES INST AVIATION IND OF CHINA
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  • Summary
  • Abstract
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Problems solved by technology

The center frequency of the analog filter detection method is very sensitive to the component parameters, etc., the design is difficult, and the error is large; the detection method based on the instantaneous reactive power theory now includes the method, method and method, and these methods detect the sum of each harmonic , the amplitude and phase information of each harmonic cannot be obtained

Method used

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  • A Method of Suppressing Current Harmonic Based on Fast Fourier Transform
  • A Method of Suppressing Current Harmonic Based on Fast Fourier Transform
  • A Method of Suppressing Current Harmonic Based on Fast Fourier Transform

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Embodiment Construction

[0020] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0021] Aiming at the requirement of extracting the sum of harmonic components satisfying the conditions, the present invention proposes a fast Fourier transform-based AC power harmonic detection method, but it is not intended as a limitation of the present invention, and the embodiment is only for illustrating the present invention. According to the principle of the invention, the present invention also has various improvements, and these improvements all fall within the protection scope of the present invention. This example illustrates its implementation process through Matlab simulation software.

[0022] (1) For the typical waveform of the load current of the rectifier circuit, see figure 2 ;

[0023] (2) AC power frequency is f=400Hz;

[0024] (3) Determine the frequency f of the A / D converter of the DSP processor for sampling the l...

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Abstract

The invention relates to an FFT based current harmonic wave inhibition method, and belongs to the technical field of harmonic wave detection of the electrical network. Any subharmonic wave is extracted, the sum of the subharmonic components that satisfy the conditions extracted, when the load harmonic current exceeds the compensation capacity of an APF, only the characteristic subharmonic wave of high damage is compensated selectively, IFFT is carried out on the harmonic waves that satisfy the condition, and the sum of content of part of the harmonic waves is extracted. Thus, the method can be used in cooperation with a passive filter, and the APF only compensate required harmonic waves.

Description

technical field [0001] The invention belongs to the technical field of grid harmonic detection and relates to a method for suppressing current harmonics based on fast Fourier transform. Background technique [0002] Aviation AC power is usually converted into DC by an AC / DC full-bridge rectifier circuit to supply high power density DC / DC switching power supplies of various topologies. With the demand for weapons and equipment, more and more power electronic devices inject a large amount of harmonics into the grid, making the current of the aviation AC power supply system non-sinusoidal, or the current is sinusoidal but out of phase with the grid voltage. This can cause problems such as reduced energy transfer efficiency and overheating of electrical equipment. All countries in the world pay full attention to the harmonic problem. Many academic conferences on harmonic problems have been held internationally. Many countries and international academic organizations have formul...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/01G01R23/16
CPCY02E40/40
Inventor 孙百军邹晓渔施宏
Owner LEIHUA ELECTRONICS TECH RES INST AVIATION IND OF CHINA
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