Fault voting line selection method by using Prony relative entropy

A line selection method and relative entropy technology, applied in directions such as fault locations, can solve problems such as attempts to extract signal parameters

Inactive Publication Date: 2013-06-05
HENAN POLYTECHNIC UNIV
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Problems solved by technology

[0002] At present, the fault line selection problem of the distribution network has not been well solved. The existing line selection methods mainly include line selection methods based on steady state quantities, line selection methods based on transient quantities, signal injecti

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  • Fault voting line selection method by using Prony relative entropy
  • Fault voting line selection method by using Prony relative entropy
  • Fault voting line selection method by using Prony relative entropy

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Embodiment

[0104] figure 1 It is the radial pure overhead line power distribution network described in the embodiment of the present invention. Such as figure 1 As shown, in this embodiment, the overhead line S 1 , S 2 , S 3 , S 4 The lengths are 12km, 20km, 17km, 10km respectively, and the line positive sequence parameters: R 1 = 0.17Ω / km, L 1 = 1.2mH / km, C 1 =9.697nF / km; zero sequence parameter: R 0 = 0.23Ω / km, L 0 =5.48mH / km, C 0 = 6nF / km. Sampling frequency f s = 100kHz. The transformer connection mode is Y / Δ, and the transformation ratio is 220kV / 35kV.

[0105] figure 2 It is the process of fault voting and line selection using Prony relative entropy described in the present invention. First, use the Prony method for the line S 1 After the fault, the transient zero-sequence current of the first T / 4 is fitted, and a series of fitting parameters can be obtained. Due to space limitations, only the initial phase angle of 60° and the grounding resistance of 100Ω are lis...

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Abstract

The invention relates to a fault voting line selection method by using Prony relative entropy. The method comprises that when a bus zero sequence voltage instantaneous value is 0.15 times larger than a nominal voltage, a fault line section device is immediately started, a Prony method is adopted for matching a transient state zero sequence current signal in a first T/4 cycle of each branch circuit after a fault; transient state dominant component of superficial characteristics fault characteristic information is selected according to a amplitude maximum principle; and then, transient state dominant component relative entropy of each branch circuit relative to other branch circuits is obtained; and finally, the fault voting line selection mechanism adopting preliminary voting, k value checkout, and final voting are put forward to vote for each branch circuit, so that a faulty line is selected. Theoretical analysis and a large number of simulations indicate that fault voting line selection method can effectively avoid influence of current transformer flux density saturation to line selection, and can greatly improve reliability of fault line selection results.

Description

technical field [0001] The invention relates to a fault voting line selection method using Prony relative entropy, which belongs to the technical field of power system fault line selection. Background technique [0002] At present, the fault line selection problem of the distribution network has not been well solved. The existing line selection methods mainly include line selection methods based on steady-state quantities, line selection methods based on transient quantities, signal injection methods, and intelligent algorithms. Applied to the method of fault line selection, etc. [0003] The steady-state quantity line selection method is not affected by the fault transition resistance, but it uses the steady-state fundamental wave component. Therefore, the accuracy of line selection needs to be improved when the neutral point grounding method changes. The line selection method based on transient quantities extracts the characteristics of the transient characteristic signal...

Claims

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Application Information

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IPC IPC(8): G01R31/08
Inventor 王晓卫李玉东张玉均张涛杨晓邦吴继维李然月
Owner HENAN POLYTECHNIC UNIV
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