Corona current pulse waveform fitting method based on Fourier transform

A Fourier transform and corona current technology, applied in pulse characteristic measurement, electrical digital data processing, spectrum analysis/Fourier analysis, etc. The effect of improving the fitting accuracy

Inactive Publication Date: 2019-07-19
ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY
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  • Description
  • Claims
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Problems solved by technology

At present, the fitting of the corona current pulse waveform using the nonlinear least squares method still needs to give a more accurate initial value of the parameters, and there are problems such as difficulty in convergence, and the accuracy is low

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  • Corona current pulse waveform fitting method based on Fourier transform
  • Corona current pulse waveform fitting method based on Fourier transform
  • Corona current pulse waveform fitting method based on Fourier transform

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Embodiment Construction

[0030] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0031] Taking the fitting of the measured corona current pulse waveform as an example, the fitting method of the present invention is used to fit the measured corona current pulse waveform data. The specific steps are as follows:

[0032] 1) The corona current waveform is obtained through experimental measurement, and its waveform is as follows figure 2 shown.

[0033] 2) Perform Fourier transform on the experimental data to obtain the amplitudes under each frequency component, and the results are shown in Table 1:

[0034] Table 1 Frequency and amplitude information of the data to be fitted after Fourier transform

[0035] Frequency (kHz) 0 190 380 580 770 960 1150 1340 1530 1730 Amplitude (1e-8) 1.3 4.5 5.4 5.6 5.6 5.5 5.6 5.5 5.5 5.4 Frequency (kHz) 1920 2110 2300 2490 2680 2880 3070 3260 3...

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Abstract

The invention discloses a corona current pulse waveform fitting method based on Fourier transform. A typical corona current pulse waveform presents a form of a double-exponential function. At present,fitting of the waveform is generally based on a nonlinear least square method, due to nonlinearity of a waveform of the double-exponential function, in a waveform fitting process, a relatively accurate parameter initial value need to be provided, problems such as misconvergence exist, and an error is relatively high. The method comprise the following steps of a), obtaining test data of to-be-fitted corona current pulse waveforms; b), carrying out discrete Fourier transform on the test data, thereby obtaining amplitude under each frequency component; c), squaring the amplitude of each frequency component and inverting squared amplitude of each frequency component; d), carrying out polynomial fitting on the amplitude obtained in the c); and e), computing to-be-fitted corona current pulse waveform parameters based on polynomial parameters obtained through fitting in the d). According to the method, through adoption of the Fourier transform, time domain nonlinear parameter fitting in thecorona current pulse waveform fitting process is converted into frequency domain linear parameter fitting, the parameter initial value does not need to be selected, the problem of misconvergence doesnot exist, and a fitting result is high in accuracy.

Description

technical field [0001] The invention relates to a corona current pulse waveform fitting method, in particular to a corona current pulse waveform fitting method based on Fourier transform. Background technique [0002] Corona current pulse waveform can be used to calculate and analyze electromagnetic environment problems such as radio interference and audible noise caused by corona discharge on transmission lines, and it is also an effective means to study the mechanism of corona discharge. Typical corona current pulses are in the form of a double-exponential function, and its waveform expression is usually obtained by fitting experimental data. In addition, because the double-exponential function waveform is widely used in engineering and applied science to describe many physical phenomena and processes (road adhesion coefficient , electromagnetic pulse waveform, lightning current waveform, etc.), so accurate and convenient acquisition of corona current pulse waveform parame...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R23/16G01R29/02G06F17/14
CPCG01R23/16G01R29/02G06F17/141
Inventor 王振国李特周象贤王少华倪琳娜李乃一
Owner ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY
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