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A Method for Identifying Magnetizing Inrush Current Based on Second-Order Taylor Coefficient

A technology of excitation inrush current and identification method, which can be used in data processing applications, complex mathematical operations, CAD numerical modeling, etc., and can solve problems such as weak anti-noise ability.

Active Publication Date: 2021-07-06
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is: the present invention provides a second-order Taylor coefficient-based excitation inrush identification method, which solves the problem that the existing excitation inrush identification method leads to protection delay action and weak anti-noise ability when a fault occurs, and achieves The effect of accurate and fast discrimination of transformer faults during the blocking period

Method used

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  • A Method for Identifying Magnetizing Inrush Current Based on Second-Order Taylor Coefficient
  • A Method for Identifying Magnetizing Inrush Current Based on Second-Order Taylor Coefficient
  • A Method for Identifying Magnetizing Inrush Current Based on Second-Order Taylor Coefficient

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Embodiment 1

[0126] Such as Figure 1-2 As shown, a method for identifying inrush current based on the second-order Taylor coefficient includes the following steps:

[0127] Step 1: According to whether the differential current is greater than the braking current, judge whether there is a fault or an excitation inrush current;

[0128] Step 2: Perform short-time Fourier transform on the collected data to obtain reference time phasors X(-ω), X(0), X(ω);

[0129] Step 3: Establish the phasor form of the simplified model of the inrush current, and use the Taylor expansion of the phasor model S(t) to obtain the Taylor derivative matrix S and the second-order Taylor coefficient q 2 and its logarithm Q;

[0130] Step 4: Use the set initial frequency as the fundamental frequency, and construct offline matrix C and offline matrix D according to the fundamental frequency;

[0131] Step 5: Solve the Taylor derivative matrix S from the Taylor dynamic model of the data obtained in steps 2 and 4, an...

Embodiment 2

[0154] Such as Figure 1-2 As shown, based on Example 1, step 3: the dynamic model of the inrush current is established by using the Taylor series to characterize the dynamic change characteristics of the second harmonic and the fundamental wave in the case of the inrush current, which better fits the inrush current in the actual power grid. Included dynamically changing properties. The part of the phasor model S(t) is expanded by Taylor to obtain the Taylor derivative matrix S. At the same time, the magnitude / phase angle model is used to carry out Taylor expansion on the exponent part of the phasor model S(t) to obtain the second-order Taylor coefficient q 2 and its logarithm Q. The second-order Taylor coefficient extracted from the dynamic model can reflect the electrical characteristics such as the second harmonic content and the change speed of the fundamental frequency component. This makes the present invention no longer rely on a single electrical quantity when ident...

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Abstract

The invention discloses a second-order Taylor coefficient-based excitation inrush identification method, which relates to the field of power system relay protection and waveform identification; it includes step 1: judging whether a fault or an excitation inrush has occurred according to whether the differential current is greater than the braking current ; Step 2: Perform short-time Fourier transform on the collected data to obtain the phasor at the reference time; Step 3: Establish the phasor form of the simplified model of inrush current; Step 4: Use the initial value of the set frequency as the fundamental frequency, Frequently construct offline matrix and offline matrix; step 5: input the data obtained in steps 3 and 4 into the Taylor dynamic model established in step 2 to solve the Taylor derivative matrix, and solve the second-order Taylor coefficient and its logarithm Q according to the Taylor derivative matrix; solve the existing The excitation inrush current identification method leads to the problem of delayed action of protection and weak anti-noise ability in the event of a fault, and achieves the effect of accurate and rapid identification of transformer faults during the blocking period.

Description

technical field [0001] The invention relates to the field of relay protection and waveform identification of electric power systems, in particular to an excitation inrush current identification method based on second-order Taylor coefficients. Background technique [0002] With the continuous development of the power grid, higher requirements are put forward for the reliability and quickness of transformer protection on site. For example, the Zhebei-Fuzhou-Zhefu 1000KV UHV AC transmission project has a transformation capacity of 1800WM, and the transformer protection involved Any abnormal behavior will lead to extremely serious consequences. However, in the voltage recovery process of transformer no-load closing or removing external faults, excitation inrush current may be generated, which may cause differential protection to malfunction. At present, the engineering site mainly relies on the second harmonic braking principle and discontinuous angle braking principle to iden...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20G06F111/10G06F17/12G06F17/14G06F17/16G06Q50/06G01R31/00H02H7/045
CPCG01R31/00G06F17/12G06F17/142G06F17/16G06Q50/06H02H7/045
Inventor 符玲宋九渊王俊雄熊思宇麦瑞坤
Owner SOUTHWEST JIAOTONG UNIV
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