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Transformer primary side transient signal measurement method and system based on L2 deconvolution

A technology of transient signal and transformer, applied in the direction of instruments, measuring electricity, measuring devices, etc., can solve the problems of unreliable test results and so on

Inactive Publication Date: 2020-02-14
STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve technical problems such as unreliable detection results caused by existing methods, the present invention provides a method based on L 2 Deconvolution-Based Transformer Primary Side Transient Signal Measurement Method

Method used

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  • Transformer primary side transient signal measurement method and system based on L2 deconvolution
  • Transformer primary side transient signal measurement method and system based on L2 deconvolution
  • Transformer primary side transient signal measurement method and system based on L2 deconvolution

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Embodiment 1

[0074] Based on L 2 Deconvolution transformer primary side transient signal measurement method, such as figure 1 As shown, the method includes the following steps:

[0075] In step S1, an arbitrary voltage waveform is input on the primary side of the transformer, and a corresponding output voltage waveform is detected on the secondary side.

[0076] Step S2, performing L on the primary side voltage signal and the secondary side voltage signal 2 Deconvolute to obtain the unit impulse response of the transformer.

[0077] In this embodiment, the specific implementation process of step S2 is as follows:

[0078] Step S21, let x[n], y[n], h[n] and e[n] denote the transformer primary side voltage signal, secondary side voltage signal, unit impulse response signal and error signal respectively, and the data lengths are respectively for M x , M y , M h and M e , then the following relationship is obtained:

[0079] y[n]=x[n]*h[n]+e[n] (1)

[0080] m h = M y -M x +1 (2) ...

Embodiment 2

[0104] Based on the above-mentioned embodiment 1, this embodiment proposes based on L 2 Deconvolution transformer primary side transient signal measurement system, the system includes: data acquisition module, used to obtain the transformer primary side input voltage signal and secondary side output voltage signal; unit impulse response calculation module, used for The transformer primary side input voltage signal and secondary side output voltage signal obtained by the data acquisition module are L 2 Deconvolution to obtain the unit impulse response of the transformer; the primary side transient signal recovery module realizes the primary side voltage signal according to the unit impulse response obtained by the unit impulse response calculation module and the transformer secondary side output voltage signal obtained by the data acquisition module recovery.

[0105] Specifically, in this embodiment, the unit impulse response calculation module is specifically configured to i...

Embodiment 3

[0108] This embodiment is based on MATLAB to carry out simulation experiments on the method and system proposed in the above-mentioned embodiment 1 and embodiment 2, specifically including:

[0109] A. Use MATLAB to preset a sine wave as the input, a Hamming window function as the system unit impulse response, and convolute them to obtain the output, such as figure 2 shown;

[0110] B. Perform L on input and output 2 Deconvolution, calculate the unit impulse response of the system;

[0111] C. Perform L on the calculated unit impulse response and output 2 Deconvolution, calculate the input;

[0112] D. If image 3 As shown, comparing the error between the actual input and the calculated input, after calculation, the relative error between the two is 1.16e-5, and the restoration effect is very good.

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Abstract

The invention discloses a transformer primary side transient signal measurement method and system based on L2 deconvolution. The method comprises the following steps of firstly, inputting any voltagewaveform on the primary side of a transformer and detecting a corresponding output voltage waveform on the secondary side; secondly, carrying out L2 deconvolution on a primary side voltage signal anda secondary side voltage signal to obtain a unit impact response of the transformer; and finally, realizing recovery of the primary side voltage signal according to the unit impact response and the secondary side voltage signal. According to the method and the system, an L2 norm is adopted, the unit impulse response of the transformer is selected to minimize the error between output of the transformer and output of the secondary side, and the accumulated error effect in the prior art is avoided. The method and the system are more adaptive to scenes with abnormality and data errors.

Description

technical field [0001] The invention relates to the technical field of transformer testing, in particular to 2 A method and system for measuring transient signals on the primary side of a transformer with deconvolution. Background technique [0002] Due to the nonlinear change of the frequency response characteristic curve of the capacitance and inductance components in the transformer, under non-power frequency conditions, the secondary side signal of the transformer and the corresponding signal on the primary side do not meet the transformation ratio relationship of the power frequency condition. The transformation ratio of the transformer will change with the system frequency. Therefore, in the transient process, the secondary side signal of the transformer cannot directly reflect the change of the primary side signal, which brings great hidden dangers to the protection device and will cause malfunction of the protection action. Or refuse to act. Whether it is a transie...

Claims

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Application Information

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IPC IPC(8): G01R35/02G01R31/00
CPCG01R31/00G01R35/02
Inventor 滕予非吴杰李小鹏甄威舒勤刘明忠龙呈段翔兮李世龙丁宣文
Owner STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST
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