Fault voting line selection method by using Prony relative entropy

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...

AI Technical Summary

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 injection methods, and intelligent algorithms. Applied to the method of fault line selection, etc.

In addition, although the above line selection methods have used the transient or steady-state signals after the fault, they have not made any attempt in the extraction of signal parameters.

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