Fault positioning method and system based on positive sequence voltage distribution characteristics

Abstract

The invention discloses a fault positioning method and system based on positive sequence voltage distribution characteristics, which belong to the field of power distribution network fault positioning. The method comprises the steps of detecting a power distribution network in real time, and extracting positive sequence voltage, positive sequence current, line impedance and admittance parameters of two ends of a line at a fault moment; respectively taking two ends of the fault line as starting points, deducing positive sequence voltage distribution along the fault line, and determining an initial fault positioning interval; utilizing the positive sequence voltage distribution along the line to respectively construct difference voltage distribution taking two ends of the fault line as starting points; and obtaining a final fault positioning interval according to the slope of the positive sequence voltage distribution curve along the line, the initial fault positioning interval and the slope of the difference voltage distribution curve. According to the invention, the problem that a distance measurement result has a large error due to the fact that the steepness of a voltage curve islow when a fault occurs under the working conditions that the branch line length coefficient of the distribution feeder line is small, the line length is short and the like is solved, and the reliability and accuracy of double-end fault positioning are effectively improved.

Description

technical field [0001] The invention belongs to the field of distribution network fault location technology, and more specifically relates to a fault location method and system based on positive sequence voltage distribution characteristics. Background technique [0002] With the development and progress of our society, safe and reliable power supply has become an important link related to national life and industrial production. At the same time, the economic loss and negative impact caused by power outages are becoming more and more obvious, and the demand for continuous supply and distribution of high-quality electric energy is becoming more and more urgent. As a basic part of the distribution network, the transmission line has a high incidence of line faults due to various factors such as wide distribution, long-term exposure to the natural environment, line aging, and human destruction. Therefore, it is very important to accurately and quickly find the fault location a...

AI Technical Summary

Problems solved by technology

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides a fault location method and system based on the distribution characteristics of positive sequence voltage. Technical problems that lead to large errors in ranging results

Images