CN-121994158-A - Submarine cable deformation monitoring system and submarine cable deformation monitoring method

CN121994158ACN 121994158 ACN121994158 ACN 121994158ACN-121994158-A

Abstract

The application provides a submarine cable deformation monitoring system and method, wherein the system comprises a submarine cable, a self-sensing optical cable of an ultra-weak fiber grating, a wavelength demodulation device and a deformation reconstruction device, when the submarine cable is in a straightening state, the wavelength demodulation device is used for acquiring first wavelength information sensed by the self-sensing optical cable of the ultra-weak fiber grating and transmitting the first wavelength information to the deformation reconstruction device, when the submarine cable is in a bending state, the wavelength demodulation device is used for acquiring second wavelength information sensed by the self-sensing optical cable of the ultra-weak fiber grating and transmitting the second wavelength information to the deformation reconstruction device, the deformation reconstruction device is used for determining the first wavelength information as an initial wavelength and the second wavelength information as a deformation wavelength, bending data of the submarine cable is determined according to the initial wavelength and the deformation wavelength through a preset analysis algorithm, a deformation curve of the submarine cable is generated according to the bending data through an inversion reconstruction algorithm, and the deformation curve is output, and therefore monitoring errors of the submarine cable deformation are reduced.

Inventors

LI SONGLIN
LUO ZHIHUI
RAN CHANGYAN
XU BING
CHEN QINGQING
LU WEI
WU MINGDIAN
XIE SHUHONG
PAN PAN
WANG LIYUAN
ZHANG TIANYI
WANG DAOGEN

Assignees

中天电力光缆有限公司
江苏中天科技股份有限公司
江苏中天物联传感有限公司
中天科技海缆股份有限公司

Dates

Publication Date: 20260508
Application Date: 20260205

Claims (10)

1. The submarine cable deformation monitoring system is characterized by comprising a submarine cable (1), a self-sensing optical cable (2) of an ultra-weak fiber grating, a wavelength demodulation device (3) and a deformation reconstruction device (4); The self-sensing optical cable (2) of the ultra-weak fiber grating is arranged inside the submarine cable (1) and is used for sensing the deformation of the submarine cable (1), and the wavelength demodulation device (3) is respectively in communication connection with the extending part of the self-sensing optical cable (2) of the ultra-weak fiber grating and the deformation reconstruction device (4); when the submarine cable (1) is in a straightening state, the wavelength demodulation device (3) is used for acquiring first wavelength information perceived by the self-sensing optical cable (2) of the ultra-weak fiber grating and transmitting the first wavelength information to the deformation reconstruction device (4); When the submarine cable (1) is in a bending state, the wavelength demodulation device (3) is used for acquiring second wavelength information perceived by the self-sensing optical cable (2) of the ultra-weak fiber grating and transmitting the second wavelength information to the deformation reconstruction device (4); The deformation reconstruction device (4) is used for determining the first wavelength information as an initial wavelength and the second wavelength information as a deformation wavelength, determining bending data of the submarine cable (1) according to the initial wavelength and the deformation wavelength through a preset analysis algorithm, generating a deformation curve of the submarine cable (1) according to the bending data through an inversion reconstruction algorithm, and outputting the deformation curve.
2. The system according to claim 1, characterized in that the sea cable (1) comprises a cable (11), a support (12) and a restraining strip (13); Wherein the self-sensing fiber bragg grating (2) is mounted to the support (12) and to the enclosed area of the restraining strip (13).
3. The system according to claim 1, characterized in that the self-sensing optical cable (2) of the ultra-weak fiber grating comprises a plurality of fiber bundles (21) and a polygonal sheath layer (22), wherein the polygonal sheath layer (22) is wrapped outside the plurality of fiber bundles (21); When the submarine cable (1) is in a straightening state, the fiber bundles (21) are used for sensing first wavelength information of the corresponding internal nodes of the submarine cable (1); when the submarine cable (1) is in a bending state, the fiber bundles (21) are used for sensing second wavelength information of the submarine cable (1) corresponding to the internal node.
4. The system of claim 3, wherein the plurality of fiber bundles (21) are seven fiber bundles (21), and wherein the plurality of fiber bundles (21) respectively comprise three fiber units (211) and four fiber reinforced plastics (212); Wherein the three optical fiber units (211) and the four fiber reinforced plastics (212) are arranged according to a preset structure; When the submarine cable (1) is in a straightening state, the three optical fiber units (211) are used for sensing first wavelength information of the corresponding internal nodes of the submarine cable (1); when the submarine cable (1) is in a bending state, the three optical fiber units (211) are used for sensing second wavelength information of the submarine cable (1) corresponding to the internal node.
5. The system of claim 4, wherein the optical fiber unit (211) comprises an optical fiber (2111) and a plastic sheath (2112), wherein the plastic sheath (2112) is wrapped outside the optical fiber (2111); When the submarine cable (1) is in a straightening state, the three optical fibers (2111) are used for sensing first wavelength information of the corresponding internal node of the submarine cable (1); when the submarine cable (1) is in a bending state, the three optical fibers (2111) are used for sensing second wavelength information of the submarine cable (1) corresponding to the internal node.
6. The system of claim 4, wherein the optical fiber (2111) comprises a plurality of ultra-weak fiber gratings (21111), wherein each ultra-weak fiber grating (21111) is inscribed at equal intervals along the fiber core axis, each ultra-weak fiber grating (21111) corresponding to a different internal node in the submarine cable (1), the first wavelength information comprising a plurality of first wavelength sub-information, the second wavelength information comprising a plurality of second wavelength sub-information; When the submarine cable (1) is in a straightening state, each ultra-weak fiber grating (21111) in the three optical fibers (2111) is used for reflecting and sensing first wavelength sub-information of a corresponding internal node of the submarine cable (1); When the submarine cable (1) is in a bending state, each ultra-weak fiber grating (21111) in the three optical fibers (2111) is used for reflecting and sensing second wavelength sub-information of the corresponding internal node of the submarine cable (1).
7. A submarine cable deformation monitoring method, applied to the submarine cable deformation monitoring system according to claim 1, comprising: When the submarine cable is in a straightening state, the wavelength demodulation device acquires first wavelength information perceived by the self-sensing optical cable of the ultra-weak fiber grating and transmits the first wavelength information to the deformation reconstruction device; When the submarine cable is in a bending state, the wavelength demodulation device acquires second wavelength information perceived by the self-sensing optical cable of the ultra-weak fiber grating and transmits the second wavelength information to the deformation reconstruction device; The deformation reconstruction device is used for determining the first wavelength information as an initial wavelength and the second wavelength information as a deformation wavelength, determining bending data of the submarine cable according to the initial wavelength and the deformation wavelength through a preset analysis algorithm, generating a deformation curve of the submarine cable according to the bending data through an inversion reconstruction algorithm, and outputting the deformation curve.
8. The method of claim 7, wherein the predetermined resolution algorithm is an orthogonal method or a parametric method, the initial wavelength comprises an initial sub-wavelength of a plurality of internal nodes in the sea cable, and the deformed wavelength comprises a deformed sub-wavelength of a plurality of internal nodes in the sea cable; correspondingly, the determining the bending data of the submarine cable according to the initial wavelength and the deformation wavelength by a preset analysis algorithm comprises the following steps: determining node bending data of the internal node corresponding to the submarine cable according to each initial sub-wavelength and each deformation sub-wavelength by an orthogonal method or a parameter method; Encrypting the bending data of each node by an interpolation method to obtain a bending data set of the node; and integrating the node bending data set into bending data of the submarine cable.
9. The method of claim 8, wherein the node bending data includes curvature and bending direction.
10. The method of claim 7, wherein the inversion reconstruction algorithm comprises a rotation matrix method, a frame method, a supercoiled method, or a deep learning method; correspondingly, the generating the deformation curve of the submarine cable according to the bending data through an inversion reconstruction algorithm comprises the following steps: And generating a deformation curve of the submarine cable according to the bending data by a rotation matrix method, a standard frame method, a supercoiled method or a deep learning method.

Description

Submarine cable deformation monitoring system and submarine cable deformation monitoring method Technical Field The application relates to the technical field of submarine cable monitoring, in particular to a submarine cable deformation monitoring system and a submarine cable deformation monitoring method. Background Submarine cable is a core infrastructure connecting the global communication network and delivering renewable energy power at sea. However, the submarine cable has the properties of high construction cost, high operation and maintenance requirements and high repair difficulty, and how to realize the long-term health state monitoring of the submarine cable is a key premise for reducing the operation and maintenance requirements and guaranteeing the economy and reliability. In the prior art, a traditional submarine cable deformation monitoring system consists of a voltage sensor, a data acquisition module, a filtering processing unit, an intelligent analysis platform and the like, and deformation is indirectly reflected by monitoring the change of the insulation state of the submarine cable through coupling partial discharge signals of the voltage sensor. However, in the prior art, the voltage sensor is coupled with the partial discharge signal to monitor the change of the insulation state of the submarine cable so as to indirectly reflect the deformation mode, and the submarine cable is easy to be subjected to environmental electromagnetic interference, so that the monitoring error of the submarine cable deformation is larger. Disclosure of Invention The application provides a submarine cable deformation monitoring system and method, which are used for solving the problems that a voltage sensor is coupled with a partial discharge signal, the change of the insulation state of a submarine cable is monitored to indirectly reflect deformation, the submarine cable deformation monitoring system is easy to be interfered by environment electromagnetic waves, and the monitoring error of the submarine cable deformation is large. The application provides a submarine cable deformation monitoring system, which comprises a submarine cable (1), a self-sensing optical cable (2) of an ultra-weak fiber grating, a wavelength demodulation device (3) and a deformation reconstruction device (4); The self-sensing optical cable (2) of the ultra-weak fiber grating is arranged inside the submarine cable (1) and is used for sensing the deformation of the submarine cable (1), and the wavelength demodulation device (3) is respectively in communication connection with the extending part of the self-sensing optical cable (2) of the ultra-weak fiber grating and the deformation reconstruction device (4); when the submarine cable (1) is in a straightening state, the wavelength demodulation device (3) is used for acquiring first wavelength information perceived by the self-sensing optical cable (2) of the ultra-weak fiber grating and transmitting the first wavelength information to the deformation reconstruction device (4); When the submarine cable (1) is in a bending state, the wavelength demodulation device (3) is used for acquiring second wavelength information perceived by the self-sensing optical cable (2) of the ultra-weak fiber grating and transmitting the second wavelength information to the deformation reconstruction device (4); The deformation reconstruction device (4) is used for determining the first wavelength information as an initial wavelength and the second wavelength information as a deformation wavelength, determining bending data of the submarine cable (1) according to the initial wavelength and the deformation wavelength through a preset analysis algorithm, generating a deformation curve of the submarine cable (1) according to the bending data through an inversion reconstruction algorithm, and outputting the deformation curve. In one possible design, the submarine cable (1) comprises a cable (11), a support (12) and a limiting strip (13), wherein the self-sensing optical cable (2) of the ultra-weak fiber grating is mounted to the surrounding area of the support (12) and the limiting strip (13). In one possible design, the self-sensing optical cable (2) of the ultra-weak fiber grating comprises a plurality of fiber bundles (21) and a polygonal sheath layer (22), wherein the polygonal sheath layer (22) is wrapped outside the fiber bundles (21), the fiber bundles (21) are used for sensing first wavelength information of the submarine cable (1) corresponding to an internal node when the submarine cable (1) is in a straightened state, and the fiber bundles (21) are used for sensing second wavelength information of the submarine cable (1) corresponding to the internal node when the submarine cable (1) is in a bent state. In one possible design, the fiber bundles (21) are seven fiber bundles (21), correspondingly, the fiber bundles (21) comprise three optical fiber units (211) and four fiber reinforced plastics (212