Power distribution network fault positioning method and system based on micro PMU and dichotomy search

Abstract

The invention provides a power distribution network fault positioning method and system based on a micro PMU and dichotomy search. The power distribution network fault positioning method comprises thesteps of calculating a positive sequence component of a fault current at a fault point by utilizing a power supply before and after fault measurement by the micro PMU in a fault observable configuration and a current at a load, and injecting the positive sequence component into the assumed fault point to construct a positive sequence fault additional component network; performing fault point searching on lines on the basis of dichotomy in the positive sequence fault additional component network in sequence, and according to an admittance matrix formed in the search process and the positive sequence component of the fault current, obtaining voltage positive sequence fault component calculation values of all PMU configuration nodes; calculating voltage deviation norms between the voltage positive sequence fault component calculation values of all the PMU configuration nodes and actual measurement values, and determining fault positions corresponding to the minimum values of the positivesequence voltage deviation norms of the lines as candidate fault points; and screening out the candidate fault points corresponding to the minimum values of the positive sequence voltage deviation norms corresponding to the candidate fault points to serve as actual fault points.

Description

technical field [0001] The disclosure belongs to the field of distribution network fault location, and in particular relates to a distribution network fault location method and system based on micro-PMU and dichotomous search. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art. [0003] As the end of the power grid directly connected to power users, the reliable and stable operation of the distribution network will directly affect the satisfaction of users with respect to power supply safety and power quality. After a fault, quickly and accurately determining the location of the fault point can effectively reduce the power outage area and shorten the power outage time of users, thereby effectively improving the power supply quality and reliability of the power grid. [0004] In the current research, the precise fault location algorithms of distributi...

AI Technical Summary

Problems solved by technology

The new method of active distribution network fault location based on the voltage deviation vector 2-norm proposed by Dai Zhihui et al. is aimed at the complex structure of the distribution network and the unbalanced three-phase situation, and proposes a fault section location method based on the voltage deviation 2-norm. However, the precise location of the fault point cannot be obtained

Therefore, the existing fault location methods have the problems of slow calculation speed and poor fault location accuracy

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