Power distribution network fault positioning method based on PMU and intelligent electric meter

Abstract

The invention provides a power distribution network fault positioning and testing method based on a PMU and an intelligent electric meter. The method comprises the following steps: S1, constructing a bus impedance matrix Zbus; S2, reading voltage offset measured by the intelligent electric meter, wherein the formula is as follows: i represents that the feeder meter is installed on a bus i, represents a voltage value measured by the feeder meter before a fault, and represents a voltage value measured by the feeder meter during the fault; and S3, estimating the fault current of each bus in the power distribution system according to the measured value of the intelligent electric meter, the bus impedance matrix and the voltage offset. According to the power distribution network fault positioning and testing method based on the PMU and the intelligent electric meter, the capability of detecting voltage change and the basic principle of a short circuit theory are explored, and once the fault is detected and classified, the fault of the power distribution system can be positioned through the intelligent electric meter installed on the bus.

Description

technical field [0001] The invention relates to the field of distribution network fault location methods, in particular to a distribution network fault location based on a PMU and a smart meter. Background technique [0002] Due to recent developments in communication and measurement systems, these developments include two-way AC meters, data management systems, and real-time information acquisition such as voltage excursions, power changes, power interruptions, and more. As a result, modern power grids are also beginning to seek effective solutions to improve monitoring and automation of distribution systems. Smart feeder meters and user meters can already achieve their potential roles, that is, the role of exceeding the billing degree of the meter. An important potential role of these meters is fault location technology, as reasonably accurate fault location can reduce the cost and time to restore power supply. Traditionally, fault location techniques in power distributi...

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a distribution network fault location method based on PMU and smart meters. At present, several advanced measurement systems have been proposed, but most of them cannot be strictly pointed out Fault location, where there is also a method for estimating the fault location by measuring the voltage and current at the substation, sparsely measuring the voltage in the network, and network electrical parameters, but its performance will be affected by the fault resistance and the necessary additional solutions , the additional solution is to estimate the impedance through an iterative process, thus adding to the complexity of the problem

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