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Power distribution fault rapid positioning method based on discrete wavelet transform

A technology of discrete wavelet transform and positioning method, which is applied to fault location, fault detection according to conductor type, measurement of electricity, etc., can solve the problems of low positioning accuracy in distribution network, large investment, and difficulty in accurately and synchronously acquiring multi-terminal traveling wave signals. , to achieve high sensitivity and reliability, improve accuracy, and simplify the size of the effect

Inactive Publication Date: 2020-06-05
STATE GRID INFO TELECOM GREAT POWER SCI & TECH +3
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Problems solved by technology

However, the existing diagnostic method impedance method calculates the fault line impedance by measuring point voltage and current during the fault, so as to obtain the fault distance, but it is easily affected by factors such as transition resistance and line branches, and false fault points are prone to appear; the traveling wave method passes Measure the propagation time between the voltage and current traveling wave to the fault point to determine the fault distance. Due to the complex structure of the distribution network with many branches, it is necessary to install equipment in multiple locations, and it is difficult to obtain multi-terminal traveling wave signals accurately and synchronously, resulting in large investment and poor positioning accuracy. Not high are suitable for fast fault location of distribution network

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  • Power distribution fault rapid positioning method based on discrete wavelet transform
  • Power distribution fault rapid positioning method based on discrete wavelet transform
  • Power distribution fault rapid positioning method based on discrete wavelet transform

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Embodiment Construction

[0041] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0042] This embodiment discloses a fast distribution fault location method based on discrete wavelet transform,

[0043] Such as figure 1 As shown in Fig. 1, the discrete wavelet transform is used to extract the features of the fault information obtained from the measurement, and the wavelet entropy after the fault signal is decomposed is calculated; then the discrete wavelet analysis signal and the calculated wavelet entropy are used as the input of the fault location model. Decisions on the section and location of faults in the distribution network.

[0044] When the small current grounding system is single-phase grounded, the fault current and fault voltage transient process contains a wealth of fault information, which is several times larger than the steady-state fault signal, and it overcomes the fact that the Fourier transform cannot perform time-freq...

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Abstract

The invention discloses a power distribution fault rapid positioning method based on discrete wavelet transform (DWT), which combines discrete wavelet transform (DWT) and a BP neural network (BPNN) inpower distribution system fault positioning, and wavelet energy spectrum entropy and per unit energy calculated according to detail coefficients of the DWT can effectively reflect fault characteristics. Besides, due to DWT decomposition, noise is filtered out, wavelet entropy (EPU) serves as input of a trained BPNN model, the fault position can be found rapidly and accurately, and the effects ofhigh sensitivity and high reliability are achieved.

Description

technical field [0001] The invention relates to the technical field of power distribution fault location, more specifically, it relates to a method for quickly locating power distribution faults based on discrete wavelet transform. Background technique [0002] The distribution network is the last link in the four links of "generation, transformation, transmission and distribution". It occupies a very important position in the power system. The working conditions of the power grid have a great influence on the reliability and quality of power supply for consumers. influences. [0003] Due to the many branches of the distribution network, the complex structure, and the low power supply radius, the fault diagnosis of the distribution network has always been a difficult point in the field of power system relay protection. However, the existing diagnostic method impedance method calculates the fault line impedance by measuring point voltage and current during the fault, so as t...

Claims

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Application Information

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IPC IPC(8): G01R31/08
CPCG01R31/086G01R31/088Y04S10/52
Inventor 黄文思董朝武陈婧廖华东陈建军廖应霞高红均刘友波
Owner STATE GRID INFO TELECOM GREAT POWER SCI & TECH
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