A submarine cable fault location positioning system for an offshore wind farm and a working method thereof

Abstract

The present invention discloses a submarine cable fault location positioning system for an offshore wind farm and a working method thereof, which belongs to the technical field of submarine cable operation and maintenance for offshore wind farms. The system includes a submarine cable status monitoring device, a submarine cable three-dimensional routing database unit, a submarine cable three-dimensional routing detection device, a submarine cable fault detection device, a carrier and a control center; the submarine cable status monitoring device is connected to the submarine cable, the submarine cable three-dimensional routing detection device and the submarine cable fault detection device are arranged on the carrier, and the submarine cable status monitoring device, the submarine cable three-dimensional routing database unit, the submarine cable three-dimensional routing detection device, the submarine cable fault detection device and the carrier are respectively connected to the control center. The system of the present invention is reasonably designed, and can efficiently and accurately find the fault point of the submarine cable, save manpower and material resources for offshore operations, and reduce the economic losses caused by the shutdown of the unit or wind farm.

Description

Technical Field

[0001] The present invention belongs to the technical field of submarine cable operation and maintenance of offshore wind farms, and in particular relates to a submarine cable fault location positioning system for offshore wind farms and a working method thereof. Background Art

[0002] With the large-scale development of offshore wind power, three-core optical fiber composite submarine cables that can transmit electricity and realize optical fiber communication have been widely used in the submarine transmission and distribution network of offshore wind farms. Offshore wind farms are mostly located near shallow sea areas, and the laid submarine cables are easily damaged by ships dropping anchors, fishing nets dragging, etc. Once a submarine cable fails, it is necessary to determine the fault type and accurately locate the fault location as soon as possible.

[0003] At present, the commonly used methods for detecting the fault location of submarine cables are: 1) According to the type of cable fault, select appropriate offline detection methods such as low-voltage pulse method or secondary pulse method to measure the distance between the fault location and the submarine cable terminal; 2) Use optical time domain reflectometry, optical time domain reflectometry based on Raman scattering and optical time domain reflectometry based on Brillouin scattering to perform online monitoring of the temperature, disturbance and stress of the optical cable and locate the fault.

[0004] The above two methods can determine the distance between the fault location and the submarine cable terminal, but due to the influence of joint loss, excess optical fiber length, line cable winding, route tortuosity, etc., it is difficult to determine the geographical location of the fault point. A three-dimensional submarine cable routing database is established in time according to the information during design or construction. Affected by seabed migration and wave erosion, the submarine cable route changes greatly after a period of actual operation, resulting in a long time for ships to carry acoustic signal or electromagnetic signal detectors for precise positioning. Summary of the invention

[0005] In order to solve the above problems, the purpose of the present invention is to provide a submarine cable fault location positioning system for an offshore wind farm and a working method thereof. The system is reasonably designed and can efficiently and accurately find the submarine cable fault point, save manpower and material resources for offshore operations, and reduce the economic losses caused by the shutdown of the unit or wind farm.

[0006] The present invention is achieved through the following technical solutions:

[0007] The invention discloses a submarine cable fault location positioning system for an offshore wind farm, comprising a submarine cable status monitoring device, a submarine cable three-dimensional routing database unit, a submarine cable three-dimensional routing detection device, a submarine cable fault detection device, a carrier and a control center; the submarine cable status monitoring device is connected to the submarine cable, the submarine cable three-dimensional routing detection device and the submarine cable fault detection device are arranged on the carrier, and the submarine cable status monitoring device, the submarine cable three-dimensional routing database unit, the submarine cable three-dimensional routing detection device, the submarine cable fault detection device and the carrier are respectively connected to the control center.

[0008] Preferably, the submarine cable status monitoring device is a fiber optic sensing submarine cable monitor.

[0009] Preferably, the submarine cable three-dimensional routing detection device and the submarine cable fault detection device are interconnected with the control center through a maritime 5G communication module.

[0010] Preferably, the vehicle is a ship, a towed body or an underwater unmanned autonomous vehicle.

[0011] Preferably, a positioning system is provided on the carrier.

[0012] Further preferably, the positioning system is a Beidou positioning system.

[0013] Preferably, the submarine cable three-dimensional route detection device comprises a route detector and a burial depth detector.

[0014] Preferably, the submarine cable fault detection device is an electromagnetic wave detector.

[0015] The present invention discloses a working method of the above-mentioned offshore wind farm submarine cable fault location positioning system, comprising:

[0016] S1: The submarine cable status monitoring device performs online continuous monitoring of the status of the submarine cable and establishes a submarine cable operation status database;

[0017] S2: The submarine cable three-dimensional routing database unit establishes a three-dimensional routing database for the submarine cable;

[0018] S3: Obtain the twisting pitch and excess fiber length based on the construction materials of the submarine cable, and extract the characteristic information of the beginning and end, landing point, mud entry and steep slope of the submarine cable in combination with the three-dimensional routing information database of the submarine cable. Establish a standard monitoring curve for the submarine cable by analyzing and comparing the operation status database of the submarine cable.

[0019] S4: The submarine cable three-dimensional routing detection device measures the three-dimensional routing information of the submarine cable and updates the three-dimensional routing database of the submarine cable;

[0020] S5: When the submarine cable status monitoring device detects a submarine cable fault, the geographical location and burial depth data of the fault point can be obtained by comparing the monitoring data with the standard monitoring curve and combining the three-dimensional routing database of the submarine cable to determine the location range of the fault point;

[0021] S6: Through the movement of the vehicle, the submarine cable fault detection device accurately determines the fault point of the submarine cable within the fault point location range.

[0022] Preferably, in S1, the operation status database of the submarine cable includes the temperature, vibration and stress data of the submarine cable; in S2, the three-dimensional routing database of the submarine cable is established based on the submarine cable routing profile information obtained during construction and inspection, integrating the longitude, latitude and depth information including the seabed topography, seabed geology and the submarine cable; in S3, after the standard monitoring curve of the submarine cable is established, the correspondence between the optical fiber length and the three-dimensional routing data of the submarine cable is corrected by extracting the characteristic points of the submarine cable routing, seabed topography and seabed geological structure; in S4, when updating the three-dimensional routing database of the submarine cable, a deviation estimation model of the three-dimensional routing information of the submarine cable is established based on the change data of the characteristic points of the submarine cable routing, seabed topography and seabed geological structure, as well as the change data of the standard monitoring curve of the submarine cable.

[0023] Compared with the prior art, the present invention has the following beneficial technical effects:

[0024] The present invention discloses a submarine cable fault location positioning system for an offshore wind farm, which can continuously monitor the real-time status of the submarine cable online through a submarine cable status monitoring device, and a submarine cable three-dimensional routing database unit establishes a three-dimensional routing database of the submarine cable, and can update the data through the actual data measured by the submarine cable three-dimensional routing detection device. When the submarine cable status monitoring device detects that a submarine cable within a certain range has a fault, it can quickly determine the approximate range of the fault, and through the movement of the carrier, the submarine cable fault detection device accurately determines the location of the fault. The system of the present invention is reasonably designed, which solves the problem that the actual routing information of the submarine cable is greatly different from the design and construction routing information due to the influence of seabed migration and wave current scouring; by comparing real-time information and historical information, the search range of the fault point location can be narrowed, and then the submarine cable fault point can be accurately and efficiently found, thereby improving the efficiency of detecting submarine cable fault points at sea, saving manpower and material resources for offshore operations, and reducing the economic losses caused by the shutdown of units or wind farms.

[0025] Furthermore, the submarine cable three-dimensional routing detection device and the submarine cable fault detection device are interconnected with the control center through the maritime 5G communication module, and the communication is reliable and less affected by interference factors.

[0026] Furthermore, the vehicle is provided with a positioning system, which can provide a reference value of the position data for system comparison and quickly lock the target position of the fault.

[0027] The working method of the above-mentioned offshore wind farm submarine cable fault location positioning system disclosed in the present invention establishes a dynamically updateable submarine cable three-dimensional routing information database, which solves the problem that the actual routing information of the submarine cable is greatly different from the design and construction routing information due to the influence of seabed migration and wave current scouring; by establishing a deviation estimation model for the three-dimensional routing information of the submarine cable, the search range of the fault point location can be narrowed, and the operational efficiency of detecting submarine cable fault points at sea can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of the offshore wind farm submarine cable fault location positioning system of the present invention;

[0029] Figure 2 A schematic diagram of the connection of the control center of the present invention.

[0030] In the figure: 1-submarine cable status monitoring device; 2-submarine cable three-dimensional routing database unit; 3-submarine cable three-dimensional routing detection device; 4-submarine cable fault detection device; 5-carrier; 6-submarine cable; 7-control center. DETAILED DESCRIPTION

[0031] The present invention is further described in detail below in conjunction with the accompanying drawings, the contents of which are intended to explain the present invention rather than to limit it:

[0032] like Figure 1 and Figure 2 , which is a submarine cable fault location positioning system for an offshore wind farm of the present invention, comprises a submarine cable status monitoring device 1, a submarine cable three-dimensional routing database unit 2, a submarine cable three-dimensional routing detection device 3, a submarine cable fault detection device 4, a carrier 5 and a control center 7; the submarine cable status monitoring device 1 is connected to a submarine cable 6, the submarine cable three-dimensional routing detection device 3 and the submarine cable fault detection device 4 are arranged on the carrier 5, and the submarine cable status monitoring device 1, the submarine cable three-dimensional routing database unit 2, the submarine cable three-dimensional routing detection device 3, the submarine cable fault detection device 4 and the carrier 5 are respectively connected to the control center 7.

[0033] In one embodiment of the present invention, the submarine cable status monitoring device 1 is a fiber optic sensing submarine cable monitor.

[0034] In a preferred embodiment of the present invention, the submarine cable three-dimensional routing detection device 3 and the submarine cable fault detection device 4 are communicated and interconnected with the control center 7 through a maritime 5G communication module.

[0035] In one embodiment of the present invention, the vehicle 5 is a ship, a towed body or an underwater unmanned autonomous vehicle.

[0036] In a preferred embodiment of the present invention, a positioning system is provided on the vehicle 5. Preferably, the positioning system is a Beidou positioning system.

[0037] In a preferred embodiment of the present invention, the three-dimensional submarine cable route detection device 3 includes a route detector and a burial depth detector, which are used to detect the route information and burial depth information of the submarine cable respectively.

[0038] In a preferred embodiment of the present invention, the submarine cable fault detection device 4 is an electromagnetic wave detector.

[0039] The working method of the above-mentioned offshore wind farm submarine cable fault location positioning system disclosed in the present invention comprises:

[0040] S1: The submarine cable status monitoring device 1 performs online continuous monitoring of the status of the submarine cable 6 and establishes an operation status database of the submarine cable 6;

[0041] S2: The submarine cable three-dimensional routing database unit 2 establishes a three-dimensional routing database of the submarine cable 6;

[0042] S3: obtaining the twisting pitch and the excess length of the optical fiber according to the construction materials of the submarine cable 6, extracting the characteristic information of the beginning and end, the landing point, the mud entry point and the steep slope of the submarine cable 6 in combination with the three-dimensional routing information database of the submarine cable 6, and establishing the standard monitoring curve of the submarine cable 6 by analyzing and comparing the operation status database of the submarine cable 6;

[0043] S4: The submarine cable three-dimensional routing detection device 3 measures the three-dimensional routing information of the submarine cable 6 and updates the three-dimensional routing database of the submarine cable 6;

[0044] S5: When the submarine cable status monitoring device 1 detects that the submarine cable 6 has a fault, by comparing the monitoring data with the standard monitoring curve and combining the three-dimensional routing database of the submarine cable 6, the geographical location and burial depth data of the fault point can be obtained to determine the location range of the fault point;

[0045] S6: By moving the carrier 5, the submarine cable fault detection device 4 accurately determines the fault point of the submarine cable 6 within the fault point location range.

[0046] In a preferred embodiment of the present invention, in S1, the operation status database of the submarine cable 6 includes the temperature, vibration and stress data of the submarine cable 6; in S2, the three-dimensional routing database of the submarine cable 6 is established based on the routing profile information of the submarine cable 6 obtained during construction and inspection, integrating the longitude, latitude and depth information including the seabed topography, seabed geology and the submarine cable 6; in S3, after the standard monitoring curve of the submarine cable 6 is established, the correspondence between the optical fiber length and the three-dimensional routing data of the submarine cable 6 is corrected by extracting the characteristic points of the submarine cable 6 routing, the seabed topography and the seabed geological structure; in S4, when updating the three-dimensional routing database of the submarine cable 6, a deviation estimation model of the three-dimensional routing information of the submarine cable 6 is established based on the characteristic point change data of the submarine cable 6 routing, the seabed topography and the seabed geological structure, and the change data of the standard monitoring curve of the submarine cable 6.

[0047] The working method of the present invention is further explained below with a specific example:

[0048] The submarine cable status monitoring device 1 is set up, and the built-in optical fiber of the submarine cable 6 is used to realize the real-time, online and continuous monitoring of the submarine cable status, and establish a database of temperature, vibration and stress information along the optical fiber under the operating state;

[0049] Establish a three-dimensional submarine cable routing information database based on the geographic information system (GIS). According to the submarine cable routing profile information obtained during construction and inspection, establish a three-dimensional submarine cable routing database unit 2 containing information such as submarine topography, submarine geology, and submarine cable "latitude and longitude / depth";

[0050] During construction and inspection, submarine cable routing and burial depth detectors are needed to verify the buried position and depth of the submarine cable, understand and grasp the changes in the seabed topography after the excavation and landfill construction of the submarine cable, and the impact of long-term seabed migration and ocean dynamic scouring on the submarine cable routing;

[0051] The twisting pitch and the excess length of the optical fiber are obtained according to the construction materials of the submarine cable 6, and the characteristic information of the beginning and end of the submarine cable, the landing point, the mud entry point, the steep slope, etc. are extracted in combination with the submarine cable three-dimensional routing information database. By analyzing and comparing the temperature, vibration, and stress information data along the optical fiber, a standard monitoring curve of the optical fiber built in the submarine cable is established; wherein, after the standard monitoring curve of the optical fiber is established, the corresponding relationship between the optical fiber length and the three-dimensional routing of the submarine cable can be further corrected by extracting the characteristic points of the submarine cable routing, the seabed topography, and the seabed geological structure;

[0052] After each submarine cable route and burial depth survey, the submarine cable 3D route information database needs to be updated based on the latest survey data. Based on the change data of characteristic points of submarine cable route, submarine topography and submarine geological structure, as well as the change data of optical fiber standard monitoring curve, a deviation estimation model of submarine cable 3D route information is established;

[0053] Establish a "submarine cable fault location system". When a submarine cable fails, the monitoring data based on optical fiber sensing will change significantly. By comparing the monitoring data of the faulty submarine cable with the standard monitoring curve and querying the submarine cable three-dimensional routing information database, the geographical location and burial depth data of the fault point can be obtained, and the location range of the fault point can be determined based on the deviation estimation model;

[0054] According to the fault point location range information, the operation and maintenance personnel can take the operation and maintenance engineering ship equipped with the submarine cable fault detection device 4 to quickly and accurately search for the submarine cable fault point in a smaller range and complete the emergency repair work of the submarine cable.

[0055] The above is only part of the embodiments of the present invention. Although some terms are used in the present invention, the possibility of using other terms is not excluded. The use of these terms is only for the convenience of describing and explaining the essence of the present invention. It is contrary to the spirit of the present invention to interpret them as any additional restrictions. The above is only to further illustrate the content of the present invention with examples for easier understanding, but it does not mean that the embodiments of the present invention are limited to this. Any technical extension or re-creation made according to the present invention is protected by the present invention.

Claims

1. A working method of a submarine cable fault location positioning system for an offshore wind farm, characterized in that: The positioning system comprises a submarine cable status monitoring device (1), a submarine cable three-dimensional routing database unit (2), a submarine cable three-dimensional routing detection device (3), a submarine cable fault detection device (4), a carrier (5) and a control center (7); the submarine cable status monitoring device (1) is connected to the submarine cable (6), the submarine cable three-dimensional routing detection device (3) and the submarine cable fault detection device (4) are arranged on the carrier (5), and the submarine cable status monitoring device (1), the submarine cable three-dimensional routing database unit (2), the submarine cable three-dimensional routing detection device (3), the submarine cable fault detection device (4) and the carrier (5) are respectively connected to the control center (7); Working methods include: S1: The submarine cable status monitoring device (1) performs online continuous monitoring of the status of the submarine cable (6) and establishes an operating status database of the submarine cable (6); S2: The submarine cable three-dimensional routing database unit (2) establishes a three-dimensional routing database of the submarine cable (6); S3: obtaining the twisting pitch and the excess length of the optical fiber according to the construction material of the submarine cable (6), extracting the characteristic information of the beginning and end, the landing point, the mud entry point and the steep slope of the submarine cable (6) in combination with the three-dimensional routing information database of the submarine cable (6), and establishing a standard monitoring curve of the submarine cable (6) by analyzing and comparing the operation status database of the submarine cable (6); S4: the submarine cable three-dimensional routing detection device (3) measures the three-dimensional routing information of the submarine cable (6) and updates the three-dimensional routing database of the submarine cable (6); S5: When the submarine cable status monitoring device (1) detects that the submarine cable (6) has a fault, the geographical location and burial depth data of the fault point can be obtained by comparing the monitoring data with the standard monitoring curve and combining the three-dimensional routing database of the submarine cable (6), thereby determining the location range of the fault point; S6: The carrier (5) moves, and the submarine cable fault detection device (4) accurately determines the fault point of the submarine cable (6) within the fault point location range; In S1, the operation status database of the submarine cable (6) includes the temperature, vibration and stress data of the submarine cable (6); in S2, the three-dimensional routing database of the submarine cable (6) is established based on the routing profile information of the submarine cable (6) obtained during construction and inspection, and is integrated with the seabed topography, seabed geology and the longitude, latitude and depth information of the submarine cable (6); in S3, after the standard monitoring curve of the submarine cable (6) is established, the corresponding relationship between the optical fiber length and the three-dimensional routing data of the submarine cable (6) is corrected by extracting the characteristic points of the route of the submarine cable (6), the seabed topography and the seabed geological structure; in S4, when updating the three-dimensional routing database of the submarine cable (6), a deviation estimation model of the three-dimensional routing information of the submarine cable (6) is established based on the characteristic point change data of the route of the submarine cable (6), the seabed topography and the seabed geological structure, and the change data of the standard monitoring curve of the submarine cable (6), as follows: After each submarine cable route and burial depth survey, the submarine cable 3D route information database needs to be updated based on the latest survey data. Based on the change data of characteristic points of the submarine cable route, seabed topography and seabed geological structure, and the change data of the optical fiber standard monitoring curve, a deviation estimation model for the submarine cable 3D route information needs to be established. A "submarine cable fault location system" is established. When a submarine cable fails, the monitoring data based on optical fiber sensing will change significantly. By comparing the monitoring data of the faulty submarine cable with the standard monitoring curve and querying the submarine cable three-dimensional routing information database, the geographical location and burial depth data of the fault point can be obtained, and the location range of the fault point can be determined based on the deviation estimation model.

2. The working method of the offshore wind farm submarine cable fault location positioning system according to claim 1 is characterized in that: The submarine cable status monitoring device (1) is a fiber optic sensing submarine cable monitoring device.

3. The working method of the offshore wind farm submarine cable fault location positioning system according to claim 1 is characterized in that: The submarine cable three-dimensional routing detection device (3) and the submarine cable fault detection device (4) are interconnected and communicated with the control center (7) via a maritime 5G communication module.

4. The working method of the offshore wind farm submarine cable fault location positioning system according to claim 1 is characterized in that: The vehicle (5) is a ship, a towed body or an underwater unmanned autonomous vehicle.

5. The working method of the offshore wind farm submarine cable fault location positioning system according to claim 1 is characterized in that: The carrier (5) is provided with a positioning system.

6. The working method of the offshore wind farm submarine cable fault location positioning system according to claim 5 is characterized in that: The positioning system is the Beidou positioning system.

7. The working method of the offshore wind farm submarine cable fault location positioning system according to claim 1 is characterized in that: The submarine cable three-dimensional route detection device (3) comprises a route detector and a burial depth detector.

8. The working method of the offshore wind farm submarine cable fault location positioning system according to claim 1 is characterized in that: The submarine cable fault detection device (4) is an electromagnetic wave detector.

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