A Traveling Wave Network Locating Method Based on Dynamic Virtual Fault

A network location and virtual fault point technology, applied in the field of traveling wave network location based on dynamic virtual faults, can solve problems such as excessive error in fault location

Active Publication Date: 2022-06-03
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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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

Method used

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  • A Traveling Wave Network Locating Method Based on Dynamic Virtual Fault
  • A Traveling Wave Network Locating Method Based on Dynamic Virtual Fault
  • A Traveling Wave Network Locating Method Based on Dynamic Virtual Fault

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Experimental program
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Embodiment 1

[0070] 1. Analysis of the arrival time difference characteristics of fault traveling waves

[0071] by figure 1 The structure shown is taken as an example for analysis, and all three lines are connected to node a. After the transmission line fails, the initial traveling wave propagates along the shortest path to three measurement points b, c, d, respectively.

[0072] Suppose f in line ab 1 The fault occurs at 1 Time required for propagation to measurement points b, c, d for

[0073]

[0074] In the formula, v b , v c , v d Respectively represent the wave speed of the initial traveling wave of the fault propagating to the measurement points b, c, and d; Indicates the line length from the fault point to the measurement point. The traveling wave velocity can generally be regarded as a fixed value, so we can make v b =v c =v d =v. Then the time difference of the initial traveling wave of fault reaching each measurement point is

[0075]

[0076] Similarly,...

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Abstract

The invention discloses a traveling wave network positioning method based on dynamic virtual faults. Step 1: make the difference between the initial traveling wave arrival times of all measurement points in pairs to obtain the time characteristic matrix of the real fault; Step 2: obtain the time characteristic matrix of the virtual fault Time feature matrix; Step 3: Use the time feature matrix of real faults and the time feature matrix of virtual faults to obtain the time information difference e t ;Step 4: Utilize the PSO algorithm to continuously update the location of the virtual fault point, repeat steps 2 to 3, and gradually approach the real fault point; when the number of iterations is reached, or the time information difference e t The value of is less than the preset value, and the iteration ends; the current virtual fault point position is used as the fault point position to realize fault location. The simulation results show that this method does not need to analyze the network structure and unnetwork operation, and can eliminate the influence of traveling wave velocity to a certain extent, and realize accurate fault location.

Description

technical field [0001] The invention relates to a traveling wave network location method based on dynamic virtual faults. Background technique [0002] With the development of the power system and the expansion of the scale of the transmission network, the line length and transmission capacity have gradually increased. After the transmission line fails, it is of great significance to accurately locate the fault and take effective measures 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. Because the traveling wave method is not affected by the operating mode of the system, has the characteristics of fast response speed and high positioning accuracy, 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 positioning and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08
CPCG01R31/085G01R31/088Y04S10/52
Inventor 李泽文夏翊翔曾祥君席燕辉邓丰雷柳唐迪
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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