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Area power network fault positioning method based on optimal wave velocity

A regional power grid and fault location technology, applied in the direction of fault location, information technology support system, etc., can solve the problems of low accuracy and affecting the accuracy of fault location

Active Publication Date: 2015-09-16
STATE GRID CORP OF CHINA +1
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Problems solved by technology

[0010] At present, some achievements have been made in the fault location research of regional power grids, but in general, the existing fault location methods of regional power grids mainly select the shortest path through the network structure graph generation matrix, or use weight coefficients to refer to multiple sets of data for fault location. Positioning basically does not involve signal attenuation and waveform distortion in the process of traveling wave transmission, which are important factors affecting the accuracy of fault location
In practical engineering applications, the accuracy of fault location in existing regional power grids is lower than that of the double-ended traveling wave method

Method used

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  • Area power network fault positioning method based on optimal wave velocity
  • Area power network fault positioning method based on optimal wave velocity
  • Area power network fault positioning method based on optimal wave velocity

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Embodiment

[0103] The following is a set of actual fault records as an example: In August 2011, Qingchang Line B in Liaoning was faulty. Due to the damage of the distance measuring device on the Qinghe Power Plant side of Qinghe Line B, the distance measurement results could not be given in time. The network structure diagram of the specific embodiment is as follows Figure 4 As shown, the calculation process of the method of the present invention is as follows:

[0104] (1) Select the adjacent stations of Qinghe Power Plant: Shendong, Niugang, Tieling, Hushitai, and Changtu stations to locate regional power grid faults.

[0105] (2) Construction of the objective function and parameter initialization, based on the initial wave head time of each branch line to pre-calculate the initial wave head time of the M terminal. Since the measurement error generally exhibits the principle of normal distribution, the average value should be close to the exact value in the case of multiple measuremen...

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Abstract

The invention relates to a fault positioning method for power system automation, and especially relates to an area power network fault positioning method based on an optimal wave velocity. The method, based on a genetic algorithm and a signal spectrum analysis, carries out fault positioning by use of branch line refracted waves correlated with fault lines in a power network. The method comprises the following steps: (1), analyzing a power grid structure and carrying out data pairing; (2), constructing a target function, and generating variable constraining conditions; (3), carrying out the signal spectrum analysis on the branch line refracted waves, and determining frequency components of signals and a frequency correction coefficient scope; (4), solving an optimal solution of the target function by use of the genetic algorithm to obtain the optimal wave velocity; and (5), according to the optimal wave velocity, obtaining a fault point position and outputting a result. The method provided by the invention takes the influences of the frequency and the path of each branch line into full consideration, and compared to a conventional area power network fault positioning algorithm, obviously improves the precision.

Description

technical field [0001] The invention relates to a fault location method for power system automation, in particular to a regional power grid fault location method based on optimal wave velocity. Background technique [0002] After the transmission line fails, even if the reclosing is successful, line inspectors are required to find the fault point, and judge whether it can continue to operate or whether it needs to be powered off for maintenance according to the degree of damage caused by the fault, so as to eliminate hidden dangers. Therefore, quickly finding the fault point after a line fault (transmission line fault location technology is also called fault location technology) has become a key technology to ensure the safe and stable operation of the power grid. [0003] Transmission line traveling wave fault location device (hereinafter referred to as traveling wave distance measuring device) can be divided into single-ended traveling wave method, double-ended traveling w...

Claims

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Application Information

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IPC IPC(8): G01R31/08
CPCY04S10/52
Inventor 郭宁明
Owner STATE GRID CORP OF CHINA
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