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Method and device for analyzing fault segment location based on spectrum sequence kurtosis

A technique of spectrum sequence and kurtosis analysis, applied in fault location, measurement device, fault detection by conductor type, etc., can solve problems such as difficulty in selecting the center of gravity frequency

Active Publication Date: 2019-01-29
ZHUHAI XJ ELECTRIC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims at the shortcoming that the distribution network fault section location method based on the transient center of gravity frequency has difficulty in selecting the center of gravity frequency downstream of the fault point, and proposes the following scheme,

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  • Method and device for analyzing fault segment location based on spectrum sequence kurtosis
  • Method and device for analyzing fault segment location based on spectrum sequence kurtosis
  • Method and device for analyzing fault segment location based on spectrum sequence kurtosis

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Embodiment 1

[0071] In the ATP / EMTP environment, a single-phase grounding simulation model of the distribution network is built. Figure 8 The 10kv power distribution line shown is simulated and verified. The overhead line selects the JMarti model related to the frequency domain, and uses the subroutine Line Check of the simulation platform to calculate the line parameters under power frequency: positive sequence impedance Z 1 =0.3199+j0.2895Ω / km; Positive sequence ground admittance b 1 =j3.584μs / km; zero sequence impedance Z 0 =0.4571+j1.8067Ω / km; zero-sequence ground admittance b 0 = j1.3673 μs / km. The equivalent load impedance of each line is unified as Z L =400+j20Ω. The lengths of the four feeders are L 1 = 15km, L 2 = 15km, L 3 =20km,L 1 =20km. The arc suppressing coil is calculated according to the overcompensation of 10%, and the corresponding inductance value L=9.42H. The complete set of power distribution control terminals FTU1~FTU5 with measuring devices divides the f...

Embodiment 2

[0082] The algorithm proposed in this paper is verified by using the fault recording data of each section switch specially detected by an electric power research institute. Figure 9 In order to adopt the zero-sequence current waveform of each detection point fused by the fault recording analysis software, it can be seen from the figure that the transient process of the first channel is significantly different from the transient process of the other two channels. The frequency spectrum obtained by Fourier analysis in the frequency domain is as follows: Figure 10 As shown, it can be seen from the figure that the main frequency of the zero-sequence current of the three fault monitoring points is 200Hz, so the method based on the transient center of gravity frequency will not be able to judge the fault section. After further kurtosis analysis on the spectrum sequence, the calculated kurtosis values ​​are K1=12.0, K2=9.25, and K3=8.43, that is, the difference between K1 and K2 is...

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Abstract

The invention provides a method and device for analyzing fault segment location based on spectral sequence kurtosis. The method and device are mainly used for the auxiliary judgment of a fault segmentwhen a single-phase grounding fault occurs on a power distribution system. The transient gravity center frequency of the upstream zero-sequence current of a fault point is obvious, and is approximateto the shape of a single impact by means of spectrum analysis, and the downstream zero-sequence current of the fault point has a certain amplitude at a plurality of resonant frequencies, and is approximate to the shape of multi impacts, and therefore, spectrograms at two sides of the fault point are significantly different; with the maximum value of the zero-sequence current Fourier spectrum analysis sequence of monitoring points adopted as input signals for kurtosis calculation, a fault segment can be determined by means of the maximum value of the kurtosis difference value of various segments when the transient gravity center frequency is not obvious, and the maximum value can be used as an effective auxiliary judgment basis.

Description

technical field [0001] The invention relates to the technical field of circuit protection, in particular to a method and device for locating a fault section based on spectrum sequence kurtosis analysis. Background technique [0002] As the power distribution link with the closest relationship with users, the reliability of distribution network directly affects the overall performance efficiency of the power system and the quality of power supply for users. With the complexity of the network structure of the power distribution system and the diversification of power supply operation modes, the difficulty of control operation and accident handling has increased. Therefore, the distribution automation system that can realize the rapid location and isolation of the line fault section and the remote automatic operation and processing of the fault has been widely used. [0003] At present, there are many researches on distribution network fault line selection and location methods...

Claims

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Application Information

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IPC IPC(8): G01R31/08
CPCG01R31/086G01R31/088
Inventor 罗勋华陈奎阳郭上华李贞胡兵彭松李丹祥林华梁
Owner ZHUHAI XJ ELECTRIC
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