Offshore wind power flexible direct current grid-connected power supply device

Abstract

The invention relates to the technical field of offshore wind power, in particular to an offshore wind power flexible direct-current grid-connected power supply device which comprises a mounting platform and a converter station, supporting columns are arranged at the positions, close to the four corners, of the bottom of the mounting platform, the supporting columns are sleeved with cleaning assemblies, and protection assemblies are arranged at the positions, close to the tops, of the supporting columns; the cleaning assembly comprises a movable ring, a rotating ring rotationally connected to the upper portion of the movable ring and a scraper rotationally connected to the inner ring wall of the movable ring. The protection assembly comprises two extension parts, two protection shells used for sealing and protecting the cleaning assembly and a top base located on the upper portion of the middle of the two protection shells. In the device, the cleaning assembly is arranged to clean the surface of the supporting column, and meanwhile, the protection assembly is arranged to protect the cleaning assembly during normal use, so that the cleaning assembly is prevented from rusting due to long-term contact with salty and wet sea wind.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of offshore wind power, and particularly relates to a flexible direct-current grid-connected power supply device for offshore wind power. BACKGROUND

[0002] When offshore wind power is generated, the wind power needs to be transmitted to land through a line for grid-connected power supply. However, due to the capacitive effect, the power loss is great during transmission of alternating current. Therefore, a converter station needs to be arranged at the installation site of the wind power equipment to convert alternating current into flexible direct current for transmission and power supply so as to reduce power loss.

[0003] For example, the application with the publication number CN119800938A discloses a comprehensive utilization platform for offshore wind power converter stations in the technical field of offshore wind power converter stations. The comprehensive utilization platform comprises a support foundation, a converter station platform, a photovoltaic panel assembly, a tower foundation platform and a fish farming tank. The support foundation is used for supporting and fixing on the seabed. The converter station platform is fixedly arranged on the top of the support foundation. The photovoltaic panel assembly is fixedly assembled on the top of the converter station platform. The tower foundation platform is arranged on the top of the converter station platform. The tower foundation platform is provided with a detection sensor. The fish farming tank is fixedly assembled on the support foundation. The converter station platform is also provided with a solar energy storage device, a tower foundation monitoring cabin and a wind power converter system. The photovoltaic panel assembly is electrically connected with the solar energy storage device. The tower foundation platform is signal-connected with the tower foundation monitoring cabin.

[0004] In combination with the above case and the actual situation, the following problems are found. Considering that whether it is near-shore or far-shore, a platform needs to be arranged below the converter station for support. When it is near-shore, the platform directly supports the column fixed on the seabed. When it is far-shore, the platform supports the column fixed through an anchor rope below, so that the support column needs to be immersed in seawater, which is easy to attach various marine organisms, causing corrosion of the support and affecting the safety of the equipment above. SUMMARY

[0005] The purpose of the present application is to provide a flexible direct-current grid-connected power supply device for offshore wind power. The device innovatively uses a scraper and a disturbance plate in combination. When cleaning the attachments, the disturbance plate is used to move the attachments away from the support column, so as to avoid the attachments from being directly attached again after cleaning. Meanwhile, the protection assembly is used to protect the cleaning assembly from being eroded by sea wind when the cleaning is not performed. Thus, the above problems of the prior art are solved.

[0006] To achieve the above purpose, the present application provides a flexible direct-current grid-connected power supply device for offshore wind power, which comprises a mounting platform and a converter station fixed on the mounting platform. The mounting platform is provided with support columns at the corners of the bottom. The support columns are provided with cleaning assemblies for cleaning the support columns. The support columns are provided with protection assemblies for protecting the cleaning assemblies at the top. The cleaning assembly includes a movable ring, a rotating ring rotatably connected above the movable ring, and a scraper rotatably connected to the inner ring wall of the movable ring. A toothed ring is coaxially fixed to the inner ring wall of the rotating ring. Driven teeth are symmetrically arranged on the top surface of the movable ring. A disturbance plate is coaxially fixed below the driven teeth. The protective assembly includes two extensions, two protective shells for sealing and protecting the cleaning assembly, and a top seat located between the two protective shells and slightly above them. The extensions are fixedly connected to the outer walls of the protective shells. The two extensions are symmetrically provided with fixed tubes on the left and right sides. The top seat is fixedly connected to the fixed tubes. Movable tubes are slidably connected to both ends of the fixed tubes. The top seat is provided with two oil storage chambers. The oil storage chambers and the corresponding fixed tubes are connected by oil supply pipes.

[0007] In this setup, considering that both near-shore and offshore locations require a platform for support beneath the converter station, near-shore platforms are directly anchored to the seabed, while offshore platforms are secured by anchor ropes. This means the support columns are constantly submerged in seawater, making them susceptible to corrosion from marine organisms, which could compromise the safety of the equipment above. Therefore, a cleaning component is installed to clean the surface of the support columns. Simultaneously, a protective component is installed to safeguard the cleaning component during normal use, preventing it from rusting due to prolonged contact with the salty sea breeze.

[0008] In the technical solution of the present invention, an installation box is fixed in the middle of the bottom surface of the installation platform, a hydraulic cylinder is fixed inside the installation box, and four first connecting rods are fixed to the bottom of the output shaft of the hydraulic cylinder. The first connecting rods correspond one-to-one with the four movable rings, and the first connecting rods are fixedly connected to the corresponding movable rings.

[0009] In this setup, a hydraulic cylinder is used to move the movable ring up and down for cleaning, and a mounting box is used to protect the hydraulic cylinder.

[0010] In the technical solution of the present invention, the support column wall is provided with a spiral groove, the vertical cross section of the spiral groove is hemispherical, the inner wall of the rotating ring is fixed with a snap-fit ​​rod, the inner end of the snap-fit ​​rod is spherical, the inner end of the snap-fit ​​rod is snapped into the spiral groove and the snap-fit ​​rod is slidably connected to the spiral groove.

[0011] In this configuration, by setting a spiral groove, when the movable ring drives the rotating ring to move up and down, the locking rod will synchronously drive the rotating ring to rotate under the action of the spiral groove, which in turn drives the toothed ring to rotate, and then drives the disturbance plate to rotate through the transmission of the driven tooth.

[0012] In the technical solution of the present invention, the scraper is generally annular and the inner ring wall is in contact with the outer surface of the support column. A circular scraper is fixed on the inner wall of the scraper. The shape of the circular scraper is adapted to the shape of the vertical section of the spiral groove. The circular scraper is slidably connected in the spiral groove.

[0013] In this setting, a circular scraper is used. As the movable ring moves up and down, the circular scraper rotates downwards along the spiral groove, thereby cleaning the surface of the spiral groove.

[0014] In the technical solution of the present invention, the outer ring wall of the movable ring near the middle and the inner ring wall near the upper part are provided with annular sliding grooves. The inner wall of the rotating ring and the outer wall of the scraper are both fixed with retaining rings. The retaining rings are engaged in the corresponding sliding grooves and the two are rotatably connected.

[0015] In this design, by using retaining rings and sliding grooves, the rotating ring and scraper can be supported without affecting their rotation.

[0016] In the technical solution of the present invention, the protective shell is in the shape of a vertical semi-cylindrical shell, the top surface of the protective shell is in contact with the bottom surface of the top seat, the bottom surface of the protective shell is reserved with an opening for the outer end of the support column and the first connecting rod to move, the two fixed tubes are symmetrically fixed in the middle of the side wall of the top seat, and the outer end of the movable tube is fixed to the inner wall of the corresponding side of the corresponding extension.

[0017] In this design, by pre-reserving an opening on the bottom surface of the protective shell for the outer ends of the support column and the first connecting rod to move, the sealing protection is prevented from being stuck by the support column and the first connecting rod, thus preventing the formation of a seal.

[0018] In the technical solution of the present invention, a sliding cavity is provided between the movable tube and the corresponding end face of the fixed tube, a first spring is provided in the sliding cavity, an oil delivery cavity is provided in the fixed tube, the two ends of the oil delivery cavity are connected to the corresponding side of the sliding cavity, and the two ends of the fixed tube are sealed with the cavity wall of the sliding cavity.

[0019] In this configuration, by setting a first spring, when the cleaning component needs to be used, the first spring pushes the movable tube to both sides, causing the outer extension to slide and open the protective shell to both sides. By setting an oil supply chamber and a sliding chamber, when the cleaning component needs to be retracted, the hydraulic oil inside the sliding chamber will be drawn back from the oil supply chamber to the oil storage chamber, causing the outer extensions on both sides to move towards the center under air pressure to seal and compress the first spring.

[0020] In the technical solution of the present invention, the top seat is provided with an annular sliding cavity, and a ring plate is slidably connected in the sliding cavity. Abutment rods are symmetrically fixed on the bottom front and back of the ring plate. The bottom end of the abutment rods extends downward through the top seat, and the position of the bottom end of the abutment rods corresponds to the top surface of the rotating ring.

[0021] In this setup, by setting up a stop bar and a ring plate, when the cleaning assembly is retracted, the movable ring moves upward until the top surface of the rotating ring contacts the stop bar. At this point, the movable ring continues to drive the rotating ring upward to push against the stop bar, thereby driving the ring plate to move upward synchronously along the sliding cavity.

[0022] In the technical solution of the present invention, a piston is provided in the oil storage cavity, and a second connecting rod is fixed to the top surface of the piston near the middle. The top end of the second connecting rod extends upward through the oil storage cavity and is fixedly connected to the bottom surface of the ring plate.

[0023] In the technical solution of the present invention, the second connecting rod is provided with a second spring on the rod wall between the top surface of the oil storage cavity and the top surface of the piston.

[0024] In this configuration, by setting a piston, when the ring plate moves upward, it will drive the piston to move upward through the second connecting rod, thereby increasing the space below the oil storage chamber. At this time, the hydraulic oil inside the sliding chamber can be drawn back from the oil delivery chamber to the oil storage chamber, which can drive the protective shell to form a seal. By setting a second spring, when the cleaning component needs to be used, the moving ring drives the rotating ring to move downward. At this time, the first spring and the second spring will release their elastic force. The hydraulic oil in the oil storage chamber will be pressed back into the sliding chamber by the action of the second spring, which will push the moving tube to both sides. Combined with the elastic force of the first spring, the outer extension will drive the protective shell to slide to both sides and open.

[0025] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. In this invention, when it is necessary to clean the attachments on the support column, the hydraulic cylinder is activated to drive the movable ring and the rotating ring to move downwards. The scraper and the circular scraper will clean the column wall and the groove wall of the spiral groove. At the same time, the locking rod will drive the rotating ring to rotate under the action of the spiral groove, which in turn drives the toothed ring to rotate. In turn, through the transmission of the driven tooth, the disturbance plate will rotate and disturb the seawater, so that the scraped marine organisms are far away from the support column, avoiding the marine organisms from getting too close and directly reattaching after cleaning.

[0026] 2. In this invention, when the cleaning component is used, the hydraulic cylinder is activated to move the movable ring downwards. At this time, the first and second springs release their elastic force. The hydraulic oil in the oil storage chamber is pressed back into the sliding chamber by the action of the second spring, which then pushes the movable tube to both sides. Combined with the elastic force of the first spring, the outer extension drives the protective shell to slide to both sides and open. After cleaning, the hydraulic cylinder drives the movable ring to move upwards and pushes up the push rod. Then, through the ring plate, the second connecting rod and the piston move upwards to increase the space below the oil storage chamber. At this time, the hydraulic oil inside the sliding chamber can be drawn back from the oil delivery chamber to the oil storage chamber, so that the outer extensions on both sides move towards the center under the action of air pressure to seal and protect. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the support column of the present invention; Figure 3 This is an exploded view of the cleaning component and support column in this invention; Figure 4 This is an exploded view of the cleaning component in this invention; Figure 5 This is a cross-sectional view of the active ring in this invention; Figure 6 This is an exploded view of the protective component in this invention; Figure 7 This is a cross-sectional view of the extension portion in this invention; Figure 8 This is a cross-sectional view of the fixed tube in this invention; Figure 9 This is a schematic diagram of the interior of the top seat in this invention; Figure 10 This is a cross-sectional view of the top seat in this invention; Figure 11 This is a schematic diagram of the piston in this invention; Explanation of reference numerals in the attached figures: 100. Install the platform; 200. Converter station; 300, Support column; 301, Spiral groove; 400. Cleaning assembly; 401. Hydraulic cylinder; 4011. First connecting rod; 4012. Mounting box; 402. Moving ring; 4021. Slide groove; 403. Rotating ring; 404. Scraper; 4041. Circular scraper; 405. Toothed ring; 406. Snap-fit ​​rod; 407. Driven tooth; 408. Disturbance plate; 500, Protective component; 501, Extension; 502, Protective shell; 503, Top seat; 5031, Oil reservoir; 5032, Sliding cavity; 504, Fixed tube; 5041, Oil delivery cavity; 5042, Oil delivery pipe; 505, Movable tube; 5051, Sliding cavity; 506, First spring; 507, Ring plate; 5071, Push rod; 508, Piston; 5081, Second connecting rod; 509, Second spring. Detailed Implementation

[0028] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments.

[0029] Unless otherwise expressly stated, throughout this specification, the term "comprising" or its variations such as "including" or "comprises" shall be understood to include the stated elements or components without excluding other elements or other components.

[0030] Reference Figures 1-11 As shown, this embodiment provides a technical solution: The offshore wind power flexible DC grid-connected power supply device of the present invention includes an installation platform 100 and a converter station 200 fixed on the installation platform 100. Support columns 300 are provided at the four corners of the bottom of the installation platform 100. Cleaning components 400 for cleaning the support columns 300 are sleeved on the support columns 300. A protective component 500 for protecting the cleaning components 400 is provided near the top of the support columns 300. When generating offshore wind power, the wind power needs to be transmitted to land via lines. However, due to the capacitance effect, alternating current (AC) suffers significant power loss during transmission. Therefore, when supplying power to offshore wind power, a converter station 200 needs to be installed at the wind turbine installation site to convert AC power into flexible direct current (DC) power for transmission to reduce power loss. Considering that a platform needs to be installed below the converter station 200 for support, whether near or far from the shore, the platform directly supports the support column 300 fixed to the seabed. In the case of near shore, the support column 300 is fixed to the seabed by anchor ropes. This means that the support column 300 needs to be immersed in seawater, which can easily attract various marine organisms and cause corrosion, affecting the safety of the equipment above. Therefore, a cleaning component 400 is installed to clean the surface of the support column 300. At the same time, a protection component 500 is installed to protect the cleaning component 400 during normal use, preventing it from rusting due to long-term contact with the salty and humid sea breeze.

[0031] The cleaning assembly 400 includes a movable ring 402, a rotating ring 403 rotatably connected above the movable ring 402, and a scraper 404 rotatably connected to the inner ring wall of the movable ring 402. A toothed ring 405 is coaxially fixed to the inner ring wall of the rotating ring 403. Driven teeth 407 are symmetrically arranged on the top surface of the movable ring 402. A disturbance plate 408 is coaxially fixed below the driven teeth 407. When cleaning is required, the movable ring 402 moves vertically downward along the support column 300, causing the scraper 404 to scrape off the marine organisms attached to the support column 300. At the same time, the rotating ring 403 will rotate and drive the disturbance plate 408 to rotate through the transmission of the toothed ring 405 and the driven teeth 407, thereby disturbing the seawater and causing the scraped marine organisms to move away from the support column 300, preventing the marine organisms from getting too close and reattaching directly after cleaning.

[0032] The protective assembly 500 includes two extensions 501, two protective shells 502 for sealing and protecting the cleaning assembly 400, and a top seat 503 located between and above the two protective shells 502. The extensions 501 are fixedly connected to the outer walls of the protective shells 502. The two extensions 501 are symmetrically provided with fixed tubes 504. The top seat 503 is fixedly connected to the fixed tubes 504. Movable tubes 505 are slidably connected to both ends of the fixed tubes 504. The top seat 503 is provided with two oil storage chambers 5031. The oil storage chambers 5031 and the corresponding fixed tubes 504 are connected by an oil supply pipe 5042. When the cleaning assembly 400 is retracted after cleaning, the movable ring 402 moves up to be close to the top seat 503. At this time, the change of hydraulic oil inside the oil storage chamber 5031 drives the two protective shells 502 to move closer to each other, thus sealing the cleaning assembly 400 and preventing it from being corroded by sea winds during cleaning.

[0033] Please see Figures 1-2 As shown, an installation box 4012 is fixed in the middle of the bottom surface of the installation platform 100. A hydraulic cylinder 401 is fixed inside the installation box 4012. Four first connecting rods 4011 are fixed to the bottom of the output shaft of the hydraulic cylinder 401. The first connecting rods 4011 correspond one-to-one with four movable rings 402, and the first connecting rods 4011 are fixedly connected to the corresponding movable rings 402. The hydraulic cylinder 401 is used to drive the movable rings 402 to move up and down for cleaning.

[0034] Please see Figures 3-4 As shown, the support column 300 has a spiral groove 301 on its column wall. The vertical section of the spiral groove 301 is hemispherical. A snap-fit ​​rod 406 is fixed to the inner wall of the rotating ring 403. The inner end of the snap-fit ​​rod 406 is spherical. The inner end of the snap-fit ​​rod 406 is snapped into the spiral groove 301 and the snap-fit ​​rod 406 is slidably connected to the spiral groove 301. By setting the spiral groove 301, when the movable ring 402 drives the rotating ring 403 to move up and down, the snap-fit ​​rod 406 will synchronously drive the rotating ring 403 to rotate under the action of the spiral groove 301, thereby driving the toothed ring 405 to rotate. In turn, the disturbance plate 408 will be driven to rotate through the transmission of the driven tooth 407.

[0035] Please see Figures 4-5 As shown, the scraper 404 is generally annular, and its inner ring wall is in contact with the outer surface of the support column 300. A circular scraper 4041 is fixed on the inner wall of the scraper 404. The shape of the circular scraper 4041 is adapted to the shape of the vertical section of the spiral groove 301. The circular scraper 4041 is slidably connected in the spiral groove 301. By setting the circular scraper 4041, when the movable ring 402 moves up and down, the circular scraper 4041 will rotate downward along the spiral groove 301 in sync, thereby cleaning the surface of the spiral groove 301, preventing marine organisms from adhering in the spiral groove 301 and affecting the safety of the support column 300, and at the same time preventing the locking rod 406 from being unable to rotate along the spiral groove 301 due to the influence of marine organisms.

[0036] Furthermore, the outer ring wall of the movable ring 402 is provided with annular grooves 4021 near the middle and the inner ring wall near the upper part. The inner wall of the rotating ring 403 and the outer wall of the scraper 404 are both fixed with retaining rings. The retaining rings are engaged in the corresponding grooves 4021 and the two are rotatably connected. By setting the retaining rings and grooves 4021, the rotating ring 403 and the scraper 404 can be supported without affecting the rotation of the rotating ring 403 and the scraper 404.

[0037] Please see Figures 6-7 As shown, the protective shell 502 is a vertical semi-cylindrical shape. The top surface of the protective shell 502 is in contact with the bottom surface of the top seat 503, ensuring that the upper part of the two protective shells 502 is sealed with the top seat 503 after they are closed. It should be noted that the top of the protective shell 502 can be slidably connected to the bottom surface of the top seat 503 to improve the stability of the sliding of the protective shell 502. The sliding connection between the two is existing technology and will not be described in detail here. The bottom surface of the protective shell 502 has an opening for the outer end of the support column 300 and the first connecting rod 4011 to move. The two fixed tubes 504 are symmetrically fixed to the middle of the side wall of the top seat 503. The outer end of the movable tube 505 is fixed to the corresponding inner wall of the corresponding outer extension 501.

[0038] Please see Figure 8 As shown, a sliding cavity 5051 is provided between the corresponding end faces of the movable tube 505 and the corresponding fixed tube 504. A first spring 506 is provided in the sliding cavity 5051. By providing the first spring 506, when the cleaning component 400 needs to be used, the first spring 506 pushes the movable tube 505 to both sides, so that the outer extension 501 drives the protective shell 502 to slide to both sides and open. An oil supply cavity 5041 is provided in the fixed tube 504. The two ends of the oil supply cavity 5041 are connected to the corresponding side sliding cavity 5051. The two ends of the fixed tube 504 are sealed with the cavity wall of the sliding cavity 5051. By providing the oil supply cavity 5041 and the sliding cavity 5051, when the cleaning component 400 needs to be retracted, the hydraulic oil inside the sliding cavity 5051 will be drawn back from the oil supply cavity 5041 to the oil storage cavity 5031, so that the outer extensions 501 on both sides move towards the center under the action of air pressure to seal and compress the first spring 506.

[0039] Please see Figures 9-11 As shown, the top seat 503 is provided with an annular sliding cavity 5032. A ring plate 507 is slidably connected in the sliding cavity 5032. Abutment rods 5071 are symmetrically fixed to the bottom of the ring plate 507. The bottom end of the abutment rod 5071 extends downward through the top seat 503, and the position of the bottom end of the abutment rod 5071 corresponds to the top surface of the rotating ring 403. When the cleaning component 400 is retracted, the movable ring 402 moves upward until the top surface of the rotating ring 403 contacts the abutment rod 5071. At this time, the movable ring 402 continues to drive the rotating ring 403 to move upward and push the abutment rod 5071, thereby driving the ring plate 507 to move upward synchronously along the sliding cavity 5032.

[0040] Furthermore, a piston 508 is provided inside the oil storage chamber 5031. A second connecting rod 5081 is fixed to the middle of the top surface of the piston 508. The top end of the second connecting rod 5081 extends upward through the oil storage chamber 5031 and is fixedly connected to the bottom surface of the ring plate 507. When the ring plate 507 moves upward, it will drive the piston 508 to move upward through the second connecting rod 5081, thereby increasing the space below the oil storage chamber 5031. At this time, the hydraulic oil inside the sliding chamber 5051 can be drawn back from the oil delivery chamber 5041 to the oil storage chamber 5031.

[0041] In addition, a second spring 509 is provided on the rod wall between the top surface of the oil storage chamber 5031 and the top surface of the piston 508. By providing the second spring 509, when the cleaning component 400 needs to be used, the movable ring 402 drives the rotating ring 403 to move down. At this time, the first spring 506 and the second spring 509 will release their elastic force. The hydraulic oil in the oil storage chamber 5031 will be pressed back into the sliding chamber 5051 by the action of the second spring 509, and then push the movable tube 505 to both sides. With the elastic force of the first spring 506, the outer extension 501 drives the protective shell 502 to slide to both sides and open.

[0042] It should be noted that all structures in the support column 300, cleaning component 400 and protection component 500 are made of steel and have a corrosion-resistant coating on their surfaces to further delay seawater or sea breeze corrosion.

[0043] The working principle of the offshore wind power flexible DC grid-connected power supply device in this invention is as follows: When an attachment is placed on the support column 300, the hydraulic cylinder 401 is activated to drive the movable ring 402 to move downward. At this time, the first spring 506 and the second spring 509 will release their elastic force. The hydraulic oil in the oil storage chamber 5031 will be pressed back into the sliding chamber 5051 by the action of the second spring 509, and then push the movable tube 505 to both sides. Combined with the elastic force of the first spring 506, the outer extension 501 drives the protective shell 502 to slide to both sides and open. When the movable ring 402 drives the rotating ring 403 to move downward, the scraper 404 and the circular scraper 4041 will clean the column wall of the support column 300 and the groove wall of the spiral groove 301. At the same time, the locking rod 406 will drive the rotating ring 403 to rotate under the action of the spiral groove 301, which will drive the toothed ring 405 to rotate. Then, through the transmission of the driven tooth 407, the disturbance plate 408 will rotate to disturb the seawater, so that the scraped marine organisms are far away from the support column 300, and prevent the marine organisms from getting too close and re-attaching directly after cleaning. After cleaning, the hydraulic cylinder 401 drives the movable ring 402 to move upward until the top surface of the rotating ring 403 contacts the push rod 5071. At this time, the movable ring 402 continues to drive the rotating ring 403 to move upward and push the push rod 5071, thereby driving the ring plate 507 to move upward along the sliding cavity 5032. This causes the second connecting rod 5081 to drive the piston 508 to move upward, increasing the space below the oil storage cavity 5031. At this time, the hydraulic oil inside the sliding cavity 5051 can be drawn back from the oil delivery cavity 5041 to the oil storage cavity 5031, causing the outer extensions 501 on both sides to move towards the center under air pressure to seal and compress the first spring 506.

[0044] The foregoing description of specific exemplary embodiments of the invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the invention to the precise forms disclosed, and it will be apparent that many changes and variations can be made in accordance with the foregoing teachings. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application, thereby enabling those skilled in the art to implement and utilize various different exemplary embodiments of the invention, as well as various different choices and variations. The scope of the invention is intended to be defined by the specification and its equivalents.

Claims

1. A flexible DC grid-connected power supply device for offshore wind power, comprising an installation platform and a converter station fixed on the installation platform, characterized in that: The installation platform has support columns at the four corners of its bottom, and cleaning components for cleaning the support columns are fitted on the support columns. The support columns also have protective components for protecting the cleaning components near the top. The cleaning assembly includes a movable ring, a rotating ring rotatably connected above the movable ring, and a scraper rotatably connected to the inner ring wall of the movable ring. A toothed ring is coaxially fixed to the inner ring wall of the rotating ring. Driven teeth are symmetrically arranged on the top surface of the movable ring. A disturbance plate is coaxially fixed below the driven teeth. The protective assembly includes two extensions, two protective shells for sealing and protecting the cleaning assembly, and a top seat located between the two protective shells and slightly above them. The extensions are fixedly connected to the outer walls of the protective shells. The two extensions are symmetrically provided with fixed tubes on the left and right sides. The top seat is fixedly connected to the fixed tubes. Movable tubes are slidably connected to both ends of the fixed tubes. The top seat is provided with two oil storage chambers. The oil storage chambers and the corresponding fixed tubes are connected by oil supply pipes.

2. The offshore wind power flexible DC grid-connected power supply device as described in claim 1, characterized in that: An installation box is fixed in the middle of the bottom surface of the installation platform. A hydraulic cylinder is fixed inside the installation box. Four first connecting rods are fixed to the bottom of the output shaft of the hydraulic cylinder. Each of the first connecting rods corresponds to one of the four movable rings, and the first connecting rods are fixedly connected to the corresponding movable rings.

3. The offshore wind power flexible DC grid-connected power supply device as described in claim 1, characterized in that: The support column wall is provided with a spiral groove, the vertical cross section of which is hemispherical. A snap-fit ​​rod is fixed to the inner wall of the rotating ring. The inner end of the snap-fit ​​rod is spherical and is snapped into the spiral groove. The snap-fit ​​rod is slidably connected to the spiral groove.

4. The offshore wind power flexible DC grid-connected power supply device as described in claim 3, characterized in that: The scraper is generally circular in shape and its inner ring wall is in contact with the outer surface of the support column. A circular scraper is fixed on the inner wall of the scraper. The shape of the circular scraper is adapted to the shape of the vertical section of the spiral groove. The circular scraper is slidably connected in the spiral groove.

5. The offshore wind power flexible DC grid-connected power supply device as described in claim 2, characterized in that: The outer ring wall of the movable ring is provided with annular grooves near the middle and the inner ring wall is provided with annular grooves near the top. The inner wall of the rotating ring and the outer wall of the scraper are both fixed with retaining rings. The retaining rings are engaged in the corresponding grooves and the two are rotatably connected.

6. The offshore wind power flexible DC grid-connected power supply device as described in claim 5, characterized in that: The protective shell is in the shape of a vertical semi-cylindrical cylinder. The top surface of the protective shell is attached to the bottom surface of the top seat. The bottom surface of the protective shell has an opening for the outer end of the support column and the first connecting rod to move. The two fixed tubes are symmetrically fixed to the middle of the side wall of the top seat. The outer end of the movable tube is fixed to the inner wall of the corresponding side of the corresponding extension.

7. The offshore wind power flexible DC grid-connected power supply device as described in claim 1, characterized in that: A sliding cavity is provided between the movable tube and the corresponding end face of the fixed tube. A first spring is provided in the sliding cavity. An oil delivery cavity is provided in the fixed tube. The two ends of the oil delivery cavity are connected to the corresponding sliding cavity. The two ends of the fixed tube are sealed to the wall of the sliding cavity.

8. The offshore wind power flexible DC grid-connected power supply device as described in claim 7, characterized in that: The top seat has an annular sliding cavity, and a ring plate is slidably connected in the sliding cavity. Abutment rods are symmetrically fixed to the bottom of the ring plate. The bottom end of the abutment rods extends downward through the top seat, and the position of the bottom end of the abutment rods corresponds to the top surface of the rotating ring.

9. The offshore wind power flexible DC grid-connected power supply device as described in claim 8, characterized in that: A piston is provided inside the oil storage chamber, and a second connecting rod is fixed to the top surface of the piston near the middle. The top end of the second connecting rod extends upward through the oil storage chamber and is fixedly connected to the bottom surface of the ring plate.

10. The offshore wind power flexible DC grid-connected power supply device as described in claim 9, characterized in that: The second connecting rod is fitted with a second spring on the rod wall between the top surface of the oil storage chamber and the top surface of the piston.

Images