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Method for calculating harmonics and inter-harmonics of electric signal

An electrical signal and harmonic technology, applied in the field of signal processing, can solve the problems of reduced harmonic detection accuracy and inability to detect inter-harmonics, etc., and achieves the effect of reducing complexity and improving calculation accuracy.

Active Publication Date: 2014-01-29
佟晓白
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Due to the fence effect of the fast Fourier transform itself, it is impossible to detect inter-harmonics, and due to the existence of inter-harmonics, the accuracy of harmonic detection is also reduced

Method used

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  • Method for calculating harmonics and inter-harmonics of electric signal
  • Method for calculating harmonics and inter-harmonics of electric signal
  • Method for calculating harmonics and inter-harmonics of electric signal

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Embodiment Construction

[0025] The principles and features of the present invention are described below in conjunction with the accompanying drawings, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention.

[0026] figure 1 The flow chart of the method for calculating the harmonics and interharmonics of the electrical signal x(t) provided by the present invention, the electrical signal x(t) described here includes harmonic and interharmonic components, such as figure 1 As shown, the method includes the following steps:

[0027] Step 101: Analyze and determine the order and number of interharmonics in the electrical signal x(t);

[0028] Its specific implementation is to analyze the specific application system and determine the number of interharmonics that may exist in the electrical signal x(t) in the application system And the number I of interharmonics.

[0029] Step 102: Calculate the fundamental wave period T i...

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Abstract

The invention discloses a method for calculating the harmonics and the inter-harmonics of an electric signal. The method for calculating the harmonics and the inter-harmonics of the electric signal comprises the following steps that firstly, the orders of the inter-harmonics and the number of the harmonics in the electric signal x (t) are analyzed and determined; secondly, the fundamental wave period T0 and the fundamental wave angular frequency omega0 of the electric signal x (t) are calculated; thirdly, the inter-harmonic with the time T serving as the virtual fundamental wave period and omega serving as the virtual fundamental wave angular frequency is converted into an integer-order harmonic with T0 serving the fundamental wave period and omega0 serving as the fundamental wave angular frequency; fourthly, calculation coefficients in a Fourier integral are stored in advance; fifthly, the amplitude value and the phase angle of each-order harmonic with the T0 serving the fundamental wave period and the omega0 serving as the fundamental wave angular frequency are calculated; sixthly, the amplitude value and the phase angle of the harmonic with the time T serving as the virtual fundamental wave period and omega serving as the virtual fundamental wave angular frequency and the amplitude value and the phase angle of the inter-harmonic with the time T serving as the virtual fundamental wave period and omega serving as the virtual fundamental wave angular frequency are calculated. By the adoption of the method for calculating the harmonics and the inter-harmonics of the electric signal, the complexity of inter-harmonic calculation can be reduced, and the accuracy of harmonic calculation can be improved.

Description

technical field [0001] The invention relates to the field of signal processing, in particular to a method for calculating harmonics and interharmonics in electric signal spectrum analysis. Background technique [0002] Signal processing is a general term for the processing processes of signal extraction, transformation, analysis, and synthesis. Through various processing of signals, useful information can be extracted from them. [0003] The most widely used signal processing is the processing of electrical signals. Electrical signals usually contain components such as fundamental waves, harmonics, and interharmonics. These different components have different amplitudes, frequencies, and initial phases. Different components carry different information, and the corresponding information can be obtained by processing the electrical signal and extracting different components. In recent years, due to the rapid development of power electronic technology, various power electroni...

Claims

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Application Information

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IPC IPC(8): G01R23/16
Inventor 佟晓白黄世年金显吉
Owner 佟晓白
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