Active power distribution network fault section positioning method based on improved LMD and energy relative entropy

Abstract

The invention discloses an active power distribution network fault section positioning method based on improved LMD and energy relative entropy, and the method comprises the steps: firstly, improving an LMD decomposition algorithm through employing mirror image continuation and adaptive noise, carrying out the difference calculation of fault transient zero-sequence current of each detection point after a fault, and obtaining the transient zero-sequence current of sections; and then, performing ILMD decomposition on the transient zero-sequence current of the sections, performing energy relative entropy calculation on each decomposed PF component, adding the energy relative entropy of each component to obtain the energy relative entropy between the two sections, and positioning the fault sections through a set fault positioning criterion. According to the method, the fault section can be accurately judged in different systems under different simulation conditions, and the fault positioning accuracy is high.

Description

technical field [0001] The invention relates to the field of distribution network fault location, in particular to an active distribution network fault section location method based on improved LMD and energy relative entropy. Background technique [0002] After a large number of distributed power sources are connected to the distribution network, the topological structure and operation mode of the distribution network are complex and changeable, and the flow direction of the fault current changes from one-way to two-way flow after a fault occurs, and the fault characteristics are weak, which leads to the traditional The fault location method is no longer applicable, which increases the difficulty of fault location in active distribution networks. Therefore, in order to quickly find out the fault section and ensure the safe and stable operation of the distribution network after DG is connected, it is particularly important to find a fault section location method suitable for...

AI Technical Summary

Problems solved by technology

[0009] Aiming at some problems existing in existing fault section location methods, combined with some fault characteristics of fault occurrence, the present invention provides a method for active distribution network fault section location based on improved LMD and energy relative entropy. In the system, the fault section can be accurately judged under different simulation conditions, and the accuracy of fault location is high

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