A fast separation method for botdr temperature and strain in smart grid icing monitoring

A technology of smart grid and separation method, which is applied in the field of fast strain separation and BOTDR temperature in smart grid icing monitoring, which can solve the problems of no calibration temperature and strain coefficient, inability to separate temperature and strain, and large grid coverage area, etc., to achieve fast Response to real-time monitoring, rapid separation, and the effect of ensuring safe power supply

Active Publication Date: 2019-03-08
NANJING UNIV
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Problems solved by technology

However, at present, the Brillouin distributed optical fiber sensing system is only directly applied to the smart grid, and the temperature and gauge coefficient are not calibrated, so it is impossible to achieve a good separation of temperature and strain.
At the same time, due to the large coverage area of ​​the power grid and the long cable distance, the amount of data generated during the measurement process is very large, which brings great pressure to real-time monitoring

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  • A fast separation method for botdr temperature and strain in smart grid icing monitoring
  • A fast separation method for botdr temperature and strain in smart grid icing monitoring
  • A fast separation method for botdr temperature and strain in smart grid icing monitoring

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Embodiment Construction

[0030] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:

[0031] figure 1 It is a flowchart of the present invention, a Brillouin Optical Time Domain Reflectometry (BOTDR) temperature and strain rapid separation method in smart grid icing monitoring, comprising the following steps:

[0032] Step 1. Use the optical fiber composite overhead ground wire (OPGW) cable in the power grid to perform sensing monitoring, and measure the temperature and stress changes of the cable in real time. Here, the results of two measurements are selected, which are respectively at 24:00 midnight ( figure 2 ) and 12 noon ( image 3 ) Brillouin frequency shift map, in the figure, the abscissa is the length of the fiber, the ordinate is the frequency, and the gray scale represents the intensity of the power;

[0033] Step 2: After smoothing and filtering, directly extract the maximum power value at each measurement position, ...

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Abstract

The invention discloses a Brillouin Optical Time Domain Reflectometry (BOTDR) temperature and strain rapid separation method in the icing monitoring of a smart grid. The optical fiber composite overhead ground wire (OPGW) cable in the power grid is used for sensing and monitoring to obtain Brillouin Abyss scattering spectrum. Select points within 3dB of the maximum value of the Brillouin scattering spectrum along the fiber path to perform quadratic polynomial fitting based on the least squares method. After fitting, the polynomial equation is obtained. After calculating the peak power and center frequency according to the polynomial coefficients, the obtained Power and frequency shift curves. According to the frequency shift curve and power curve, select the fiber splicing point, and recalibrate the temperature coefficient and gauge coefficient of Brillouin power. After the coefficient is corrected, the temperature and strain can be accurately separated.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to a BOTDR temperature and strain rapid separation method in smart grid ice monitoring. Background technique [0002] Recently, advanced technologies in various fields have been widely used in traditional power grids, making the development of power grids have a trend of intelligence. However, in the process of power transmission, the terrain and terrain conditions are complex, and the probability of transmission lines encountering line icing is very high, especially in areas with high humidity or prone to snowfall, line icing is prone to occur. The icing of transmission lines seriously threatens the safe operation of the power grid, causing galloping damage, line tripping and power outages, icing insulator strings causing icing flashovers, line breaks, tower collapses and other major accidents. Therefore, using reliable and effective detection methods and analysis an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K11/32G01D21/02G01K11/322
CPCG01D21/02G01K11/32
Inventor 张益昕刘品一张旭苹董家赟王清许梦帆王犇
Owner NANJING UNIV
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