Traveling wave network positioning method based on dynamic virtual fault

Abstract

The invention discloses a traveling wave network positioning method based on a dynamic virtual fault. The method comprises the steps: 1, carrying out subtraction of arrival time of initial traveling waves of all measurement points in pairs, and obtaining a time feature matrix of a real fault; 2, obtaining a time characteristic matrix of the virtual fault; 3, solving a time information difference degree et by utilizing the time characteristic matrix of the real fault and the time characteristic matrix of the virtual fault; and 4, continuously updating the position of a virtual fault point by using a PSO algorithm, repeating the steps 2-3, and gradually approaching a real fault point; when the number of iterations is reached or the value of the time information difference degree et is smaller than a preset value, ending the iteration; and taking the current virtual fault point position as a fault point position to realize fault positioning. A simulation result shows that the method does not need to analyze a network structure and network disconnection operation, can eliminate the influence of a traveling wave velocity to a certain extent, and achieves the precise positioning of a fault.

Description

technical field [0001] The invention relates to a traveling wave network positioning method based on dynamic virtual faults. Background technique [0002] With the development of the power system and the expansion of the transmission network scale, the line length and transmission capacity have gradually increased. Accurately locating the fault and taking effective measures for the faulty line after the fault of the transmission line is of great significance to ensure the safe and reliable operation of the power system. In recent years, fault location methods mainly include: impedance method, fault analysis method and traveling wave method. The traveling wave method is not affected by the operation mode of the system, has the characteristics of fast response speed and high positioning accuracy, and more and more scholars have devoted themselves to the research of traveling wave fault location. [0003] The traveling wave method is mainly divided into two types: single-end ...

AI Technical Summary

Problems solved by technology

The wave velocity value is a key factor affecting the accuracy of fault location. It is related to line parameters and is easily affected by factors such as weather and geographical environment. According to engineering experience, the wave velocity value is generally 0.936 to 0.987 times the speed of light; when the calculated wave velocity is compared with the actual When the wave speeds do not match, the fault location error will be too large

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