Real-time scouring monitoring system and method for offshore wind turbine foundation

Abstract

The invention discloses a real-time scouring monitoring system and method for an offshore wind turbine foundation, and relates to the technical field of offshore wind turbine foundation monitoring, the monitoring system comprises a plurality of online monitoring devices and a second tide gauge, the plurality of online monitoring devices are used for being fixed on a seabed and arranged around the offshore wind turbine foundation, and the second tide gauge is used for being connected with the offshore wind turbine foundation. The second tide level meter is used for being arranged on the offshore wind turbine foundation and located below the sea surface, and the online monitoring device and the second tide level meter are both electrically connected with a power source and a control system; wherein any one of the on-line monitoring devices comprises a mounting base and a first tide level meter, and the first tide level meter is arranged on the mounting base. The real-time scouring monitoring method for the offshore wind turbine foundation is implemented by adopting the real-time scouring monitoring system for the offshore wind turbine foundation. According to the invention, scouring on-line monitoring of the offshore wind turbine foundation in different directions can be realized, and real-time early warning is realized for the safety of the offshore wind turbine foundation.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore wind turbine foundation monitoring, and in particular to a real-time scour monitoring system and method for an offshore wind turbine foundation. Background Art

[0002] Ocean energy is a major energy source hidden in the ocean, including tidal energy, wave energy, ocean wind energy, salinity difference energy, temperature difference energy, etc. As a highly cost-effective energy source that can be used efficiently and conveniently, ocean energy has developed rapidly in recent years. Various studies have shown that the energy assessment of offshore wind energy is much higher than that of land wind energy.

[0003] At present, offshore wind turbines are usually used to utilize offshore wind energy. Offshore wind turbines are mainly composed of wind turbine foundations, wind turbine towers, blades, and generators. The wind turbine foundation is the main load-bearing component and the main support of the wind turbine. The stability of the offshore wind turbine foundation largely determines the service life and cost of wind power. However, the scouring phenomenon around offshore wind turbine foundations, especially large-diameter steel pipe pile foundations, is obvious and rapid, and the scouring often develops at the meter level, which seriously endangers the safety of offshore wind turbine foundations.

[0004] Currently, the scour and settlement monitoring of offshore wind turbine foundations mostly uses methods such as acoustic Doppler multi-beam, scanning sonar, and underwater robot inspections to conduct regular scanning of the seabed topography of offshore wind farms. The scanning cycle is generally more than half a year. The regular scanning method lacks real-time performance and is expensive, and it is impossible to timely grasp the scour situation of offshore wind turbine foundations and conduct timely manual intervention.

[0005] Therefore, a real-time scour monitoring system and method for offshore wind turbine foundations are provided to solve the above-mentioned technical problems existing in the prior art. Summary of the invention

[0006] The purpose of the present invention is to provide a real-time scour monitoring system and method for offshore wind turbine foundations to solve the problems existing in the above-mentioned prior art, and to realize online monitoring of scour in different directions of offshore wind turbine foundations, so as to provide real-time early warning for the safety of offshore wind turbine foundations.

[0007] To achieve the above object, the present invention provides the following solutions: The present invention provides a real-time scour monitoring system for an offshore wind turbine foundation, comprising an online monitoring device and a second tide gauge, wherein the online monitoring device is provided in plurality, and the plurality of online monitoring devices are used to be fixed on the seabed and arranged around the offshore wind turbine foundation, and the second tide gauge is used to be arranged on the offshore wind turbine foundation and is located below the sea surface, and the online monitoring device and the second tide gauge are both electrically connected to a power supply and a control system; wherein any one of the online monitoring devices comprises a mounting base and a first tide gauge, and the first tide gauge is arranged on the mounting base.

[0008] Preferably, the mounting base comprises a protective frame, and the first tide gauge is arranged on the protective frame.

[0009] Preferably, the mounting base further comprises a protective plate, which is arranged around the protective frame and fixed to the protective frame by bolts, and the protective plate is also provided with a plurality of drainage holes for drainage.

[0010] Preferably, the bottom four corners of the protection frame are also provided with footing legs, and the footing legs are used to be inserted into the muddy bottom; An anti-settling grid is also provided at the bottom of the protection frame.

[0011] Preferably, the protective frame is also provided with lifting ears for lifting.

[0012] Preferably, four online monitoring devices are provided, and the four online monitoring devices are evenly distributed along the circumference around the offshore wind turbine foundation; Among them, the four online monitoring devices are all located on the seabed within a radius of 5m with the center of the offshore wind turbine foundation as the center of the circle.

[0013] Preferably, at least one of the online monitoring devices also includes a photoelectric separation cabin and a data acquisition cabin. The photoelectric separation cabin is electrically connected to the power supply and the control system through a photoelectric composite cable. The power supply and the control system are both arranged in the wind power control room of the offshore wind turbine foundation. The photoelectric separation cabin is used to physically separate the photoelectric composite cable, and the output is an electrical interface and an optical interface. The electrical interface and the optical interface are both connected to the input interface of the data acquisition cabin through a first watertight cable to achieve power supply and communication; the output interface of the data acquisition cabin is connected to the remaining online monitoring devices and the second tide gauge through a second watertight cable.

[0014] Preferably, both the first tide gauge and the second tide gauge are pressure tide gauges.

[0015] Preferably, an inclinometer and an optical probe are also installed on the mounting base.

[0016] The present invention also provides a real-time scour monitoring method for an offshore wind turbine foundation, which is implemented by using the real-time scour monitoring system for an offshore wind turbine foundation as described above, and includes the following steps: S1. Arrange the second tide gauge and a plurality of the online monitoring devices; S2, connecting the second tide gauge and the plurality of online monitoring devices to a power supply and a control system; S3. Analyze and solve the measurement data of the second tide gauge and the measurement data of the plurality of online monitoring devices to realize online monitoring of scour in different directions of the offshore wind turbine foundation.

[0017] Compared with the prior art, the present invention has achieved the following technical effects: The real-time scour monitoring system for offshore wind turbine foundation of the present invention includes an online monitoring device and a second tide gauge. There are multiple online monitoring devices, and the multiple online monitoring devices are used to be fixed on the seabed and arranged around the offshore wind turbine foundation, so as to measure the scour information in different directions; the second tide gauge is used to be arranged on the offshore wind turbine foundation and is located below the sea surface; and the online monitoring device and the second tide gauge are electrically connected to the power supply and the control system to realize communication and power supply; wherein, any online monitoring device includes a mounting base and a first tide gauge, and the first tide gauge is arranged on the mounting base. The present invention analyzes and performs secondary calculations on the measurement data of the second tide gauge and the measurement data of the online monitoring device, so as to realize online monitoring of scour in different directions of the offshore wind turbine foundation and realize real-time early warning for the safety of the offshore wind turbine foundation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a distribution diagram of a real-time scour monitoring system for offshore wind turbine foundations in an embodiment of the present invention; Figure 2 It is a connection diagram of a real-time scour monitoring system for offshore wind turbine foundations in an embodiment of the present invention; Figure 3 It is a schematic diagram of the three-dimensional structure of the online monitoring device in an embodiment of the present invention; Figure 4 FIG. 4 is a top view of an online monitoring device in an embodiment of the present invention.

[0020] In the figure: 100-online monitoring device; 101-protection plate; 102-base support leg; 103-first tide gauge; 104-lifting ear; 105-optical probe; 106-data acquisition cabin; 107-anti-sinking grid; 108-first watertight cable; 109-photoelectric separation cabin; 110-protection frame; 111-photoelectric composite cable; 112-second watertight cable; 200-second tide gauge; 300-offshore wind turbine foundation; 301-wind power control room. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] The purpose of the present invention is to provide a real-time scour monitoring system and method for offshore wind turbine foundations to solve the problems existing in the above-mentioned prior art, and to realize online monitoring of scour in different directions of offshore wind turbine foundations, so as to provide real-time early warning for the safety of offshore wind turbine foundations.

[0023] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] Embodiment 1 like Figure 1-Figure 4 As shown, in this embodiment, a real-time scour monitoring system for offshore wind turbine foundation is provided, including an online monitoring device 100 and a second tide gauge 200, wherein the online monitoring device 100 is provided with a plurality of the online monitoring devices 100, and the plurality of the online monitoring devices 100 are used to be fixed on the seabed and arranged around the offshore wind turbine foundation 300, so as to facilitate the measurement of scour information in different directions; the second tide gauge 200 is used to be arranged on the offshore wind turbine foundation 300, and is located below the sea surface, specifically below 1m of the historical lowest tide level in the area; and the online monitoring device 100 and the second tide gauge 200 are both electrically connected to the power supply and the control system to realize communication and power supply; wherein, any of the online monitoring devices 100 includes an installation base and a first tide gauge 103, and the first tide gauge 103 is arranged on the installation base. In this embodiment, the measurement data of the second tide gauge 200 and the measurement data of the online monitoring device 100 are analyzed and solved twice, so as to realize online monitoring of scour in different directions of the offshore wind turbine foundation 300, and realize real-time early warning for the safety of the offshore wind turbine foundation 300.

[0025] In this embodiment, the mounting base includes a protective frame 110, and the first tide meter 103 is fixed to the protective frame 110 through a clamp bracket, and is used to measure the tide value of the deployment point; wherein, the protective frame 110 serves as the load-bearing structure of the online monitoring device 100, and is made of 304 stainless steel, and is used to carry the first tide meter 103 and the optoelectronic separation cabin 109, the data acquisition cabin 106, the optical probe 105, etc. described below.

[0026] In this embodiment, the mounting base also includes a protective plate 101, which is arranged around the protective frame 110 and fixed to the protective frame 110 by bolts. The protective plate 101 is also provided with a plurality of circular drainage holes for drainage, thereby reducing the displacement of the online monitoring device 100 caused by fluid resistance.

[0027] In this embodiment, the bottom four corners of the protection frame 110 are further provided with bottom legs 102, which are suitable for muddy bottom. After the online monitoring device 100 is deployed, the bottom corner legs penetrate into the muddy bottom to prevent the protection frame 110 from shifting.

[0028] Furthermore, an anti-subsidence grille 107 is provided at the bottom of the protective frame 110, and the contact area between the chassis of the protective frame 110 and the seabed is increased by the anti-subsidence grille 107. At the same time, the anti-subsidence grille 107 protects the first tide gauge 103 and the optical probe 105, data acquisition cabin 106, optoelectronic separation cabin 109, etc. mentioned below, and the silt can be quickly filtered out during the recovery process.

[0029] In this embodiment, the protection frame 110 is further provided with a lifting lug 104 for lifting, specifically for mounting on a sling or an acoustic release mechanism, to achieve easy deployment of the system.

[0030] In this embodiment, four online monitoring devices 100 are provided, and the four online monitoring devices 100 are evenly distributed along the circumference around the offshore wind turbine foundation 300; wherein the four online monitoring devices 100 are all located on the seabed within a radius of 5m with the center of the offshore wind turbine foundation 300 as the center of the circle.

[0031] Furthermore, other numbers of online monitoring devices 100 may be provided as required, for example, three, five or six may be provided.

[0032] In this embodiment, one of the online monitoring devices 100 also includes a photoelectric separation cabin 109 and a data acquisition cabin 106. The photoelectric separation cabin 109 is electrically connected to the power supply and the control system through a photoelectric composite cable 111. The power supply and the control system are both arranged in the wind power control room 301 of the offshore wind turbine foundation 300. The photoelectric separation cabin 109 is used to physically separate the photoelectric composite cable 111, and the output is an electrical interface and an optical interface. The electrical interface and the optical interface are both connected to the input interface of the data acquisition cabin 106 through a first watertight cable 108 to achieve power supply and communication; the output interface of the data acquisition cabin 106 is connected to the remaining online monitoring devices 100 and the second tide gauge 200 through a second watertight cable 112 for power supply and communication, and to aggregate the measurement and status monitoring data.

[0033] In this embodiment, the first tide gauge 103 and the second tide gauge 200 are preferably pressure tide gauges, and the measurement method thereof is as follows: A second tide gauge 200 is arranged on the offshore wind turbine foundation 300, and the first tide gauge 103 is arranged at four locations around it. The second tide gauge 200 is placed at a fixed position with a known water depth, and the first tide gauge 103 is directly arranged on the seabed surface; all five tide gauges are pressure-type tide gauges. When the depth of the seawater changes, the water pressure will also change accordingly. By monitoring the change in water pressure, the depth of the seawater and the scouring and silting of the seabed can be inferred. The role of the second tide gauge 200 is to provide a benchmark for comparing the data of the first tide gauge 103.

[0034] Offshore wind turbine foundation 300m sinking depth:

[0035] Where: is the pressure of the second tide gauge 200; is the pressure of the first tide gauge 103; g is the local gravity, which is obtained using the 1980 international normal gravity formula, that is, , where g0=9.780327m / s 2 , =0.0053024, =0.0000058; is the geographical latitude of the measuring point; is the density of seawater, which is calculated based on the on-site water temperature T and the on-site salinity S, and is measured by the sensor temperature and salinity probe. The four test points can be calculated in turn.

[0036] In this embodiment, an inclinometer and an optical probe 105 are also installed on the mounting base. The inclinometer is used to measure the inclination of the online monitoring device 100, and the optical probe 105 is used for optical video monitoring of the scouring and settlement changes at the deployment point of the online monitoring device 100; the inclinometer and the optical probe 105 are used for auxiliary monitoring.

[0037] The present invention also provides a real-time scour monitoring method for an offshore wind turbine foundation, which is implemented by using the real-time scour monitoring system for an offshore wind turbine foundation as described above, and mainly includes the following steps: S1, arranging the second tide gauge 200 and a plurality of the online monitoring devices 100; S2, connecting the second tide gauge 200 and the plurality of online monitoring devices 100 to a power supply and a control system; S3. Analyze and solve the measurement data of the second tide gauge 200 and the measurement data of the plurality of online monitoring devices 100 to realize online monitoring of scour in different directions of the offshore wind turbine foundation.

[0038] In one embodiment, the step S1, arranging the second tide gauge 200 and the plurality of online monitoring devices 100, mainly comprises: designing and manufacturing a protective frame 110 of the online monitoring device 100 and a clamp bracket of the first tide gauge 103, installing the first tide gauge 103, the photoelectric separation cabin 109, the data acquisition cabin 106, and the optical probe 105 on the protective frame 110, ensuring that the four tide gauges built into the online monitoring device 100 are installed at the same height on the four sets of protective frames 110, which is to ensure that the four tide gauges perform measurements at the same time, thereby avoiding errors caused by clock inconsistency.

[0039] The second tide gauge 200 separately fixedly installed on the offshore wind turbine foundation 300 is fixedly installed on the offshore wind turbine foundation 300 at a position not less than 1m from the historical lowest tide level. Its function is to ensure that the second tide gauge 200 is below the historical lowest tide level and to ensure that the second tide gauge 200 is normally below the sea surface.

[0040] The step S2, connecting the second tide gauge 200 and the plurality of online monitoring devices 100 to a power supply and a control system, mainly comprises: connecting the online monitoring device 100 through a watertight cable and its matching connector, connecting the online monitoring device 100 having the optoelectronic separation cabin 109 and the data acquisition cabin 106 to the optoelectronic composite cable 111 outputted from the offshore wind turbine foundation 300, and connecting the second tide gauge 200 separately arranged on the offshore wind turbine foundation 300 to the online monitoring device 100 through a second watertight cable, which serves to realize power supply and communication for the online monitoring device 100 and the separately arranged second tide gauge 200; the other ends of the optoelectronic composite cable 111 outputted from the offshore wind turbine foundation 300 are respectively connected to the power supply and control system (preferably a data acquisition computer) of the wind turbine control room.

[0041] The step S3, analyzing and solving the measurement data of the second tide meter 200 and the measurement data of the multiple online monitoring devices 100, to realize the online monitoring of scour in different directions of the offshore wind turbine foundation, mainly includes: the control system can receive the monitoring and optical data of four sets of online monitoring devices 100 and the second tide meter 200 in real time, and the scour settlement of four points can be calculated by the built-in algorithm in combination with the inclination angle and optical detection.

[0042] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A real-time scour monitoring system for offshore wind turbine foundations, characterized in that: It includes an online monitoring device and a second tide gauge, wherein a plurality of the online monitoring devices are provided, and the plurality of online monitoring devices are used to be fixed on the seabed and are arranged around the offshore wind turbine foundation, and the second tide gauge is used to be arranged on the offshore wind turbine foundation and is located below the sea surface, and the online monitoring device and the second tide gauge are both electrically connected to a power supply and a control system; wherein any one of the online monitoring devices includes a mounting base and a first tide gauge, and the first tide gauge is arranged on the mounting base.

2. The real-time scour monitoring system for offshore wind turbine foundation according to claim 1 is characterized in that: The mounting base comprises a protection frame, and the first tide gauge is arranged on the protection frame.

3. The real-time scour monitoring system for offshore wind turbine foundation according to claim 2 is characterized in that: The mounting base also includes a protective plate, which is arranged around the protective frame and fixed to the protective frame by bolts. The protective plate is also provided with a plurality of drainage holes for drainage.

4. The real-time scour monitoring system for offshore wind turbine foundation according to claim 2 is characterized in that: The bottom four corners of the protection frame are also provided with footing legs, which are used to be inserted into the muddy bottom. An anti-settling grid is also provided at the bottom of the protection frame.

5. The real-time scour monitoring system for offshore wind turbine foundation according to claim 2 is characterized in that: The protective frame is also provided with lifting ears for lifting.

6. The real-time scour monitoring system for offshore wind turbine foundation according to any one of claims 1 to 5, characterized in that: There are four online monitoring devices, and the four online monitoring devices are evenly distributed along the circumference around the offshore wind turbine foundation; Among them, the four online monitoring devices are all located on the seabed within a radius of 5m with the center of the offshore wind turbine foundation as the center of the circle.

7. The real-time scour monitoring system for offshore wind turbine foundation according to any one of claims 1 to 5, characterized in that: At least one of the online monitoring devices also includes a photoelectric separation cabin and a data acquisition cabin. The photoelectric separation cabin is electrically connected to the power supply and the control system through a photoelectric composite cable. The power supply and the control system are both arranged in the wind power control room of the offshore wind turbine foundation. The photoelectric separation cabin is used to physically separate the photoelectric composite cable, and the output is an electrical interface and an optical interface. The electrical interface and the optical interface are both connected to the input interface of the data acquisition cabin through a first watertight cable to achieve power supply and communication; the output interface of the data acquisition cabin is connected to the remaining online monitoring devices and the second tide gauge through a second watertight cable.

8. The real-time scour monitoring system for offshore wind turbine foundation according to claim 1 is characterized by: The first tide gauge and the second tide gauge are both pressure tide gauges.

9. The real-time scour monitoring system for offshore wind turbine foundation according to claim 1 is characterized by: An inclinometer and an optical probe are also installed on the installation base.

10. A real-time scour monitoring method for offshore wind turbine foundation, characterized in that: The real-time scour monitoring system for offshore wind turbine foundation according to any one of claims 1 to 9 is implemented, comprising the following steps: S1. Arrange the second tide gauge and a plurality of the online monitoring devices; S2, connecting the second tide gauge and the plurality of online monitoring devices to a power supply and a control system; S3. Analyze and solve the measurement data of the second tide gauge and the measurement data of the plurality of online monitoring devices to realize online monitoring of scour in different directions of the offshore wind turbine foundation.

Images