Offshore wind power platform transformer integrated hanger center maintenance equipment and maintenance method

Abstract

This invention belongs to the field of offshore wind power operation and maintenance equipment technology, and discloses an integrated core-lifting maintenance device and method for offshore wind power platform transformers. The device includes an intelligent lifting system and a retractable sealed maintenance cabin. The intelligent lifting system is equipped with attitude sensors, cameras, hydraulic cylinders, slide rails, and hooks. The control system drives the hydraulic cylinders, slide rail servo motors, and hook lifting and lowering based on sensor signals to achieve active wave compensation, keeping the hook in a constant position on the swaying platform. The retractable sealed maintenance cabin consists of a rigid frame, electrically retractable sealing walls, and an environmental control system, forming a positive-pressure, dry, and clean sealed space. This invention integrates dynamic lifting compensation with sealed environmental control, enabling safe and efficient on-site transformer core-lifting maintenance at sea, significantly reducing weather dependence, preventing transformer moisture damage, and shortening power outage time.

Description

Technical Field

[0001] This invention belongs to the field of offshore wind power operation and maintenance equipment technology, specifically relating to an integrated core-lifting maintenance device and maintenance method for offshore wind power platform transformers. Background Technology

[0002] Offshore wind farms collect, boost, and transmit electricity through offshore substations, with the power transformer being the core equipment of the substation. Offshore platforms are exposed to harsh environments with high salt spray, high humidity, easy condensation, and deck sway for extended periods. When transformers experience internal faults or require scheduled overhauls, core inspections must be carried out.

[0003] Currently, there are four major technical bottlenecks in the maintenance of offshore transformer cores: Highly dependent on the environment: It requires waiting for absolutely calm sea conditions and a long period of stable weather window. Traditional cranes cannot operate stably on swaying decks, resulting in extremely short maintenance windows and long waiting periods.

[0004] Limited operating space: The deck area of ​​offshore platforms is small and the load-bearing capacity is limited, making it difficult for large cranes to enter the site and carry out operations, and making it difficult to implement conventional maintenance plans.

[0005] High safety risks: hoisting in open environments is susceptible to crosswinds; the equipment body exposed to high humidity and salt spray will quickly become damp, leading to a decrease in insulation level and causing secondary failures.

[0006] Long construction period and high cost: waiting for the weather, dispatching large equipment, and on-site preparation take a long time, power outage time is long, and operation and maintenance costs are high; using engineering vessels for hoisting or transporting back to shore for repair is complicated, and power outage losses are huge.

[0007] Existing technologies struggle to balance marine adaptability, environmental control, hoisting stability, and operational efficiency, necessitating a highly integrated, safe, efficient, and weather-independent on-site core-lifting maintenance solution. Summary of the Invention

[0008] The purpose of this invention is to provide an integrated core-lifting maintenance device and method for offshore wind power platform transformers, which solves the problems of strong dependence on the marine environment, limited working space, high risk of transformer body getting damp, long construction period and high cost in the existing technology.

[0009] This invention is achieved through the following technical solution: This invention discloses an integrated core-lifting and maintenance device for transformers on offshore wind power platforms, comprising an intelligent lifting system and a retractable sealed maintenance cabin: The transformer, intelligent lifting tool system, and retractable sealed maintenance cabin to be inspected are installed on the offshore substation platform, with the transformer and intelligent lifting tool system located inside the retractable sealed maintenance cabin. The intelligent lifting system includes a support frame, slide rails, a hook, platform attitude sensors, a camera, and a control system. The support frame comprises four support columns and four crossbeams, with the four crossbeams connected to the top of the four support columns to form a rectangular frame. The slide rails are installed below two of the crossbeams, and the hook is mounted on the slide rails and moves horizontally along them. Each support column has a support base at its bottom, and a hydraulic cylinder is installed between the support base and the support column. The platform attitude sensors are installed at the geometric center of the offshore substation platform to measure the roll angle, pitch angle, heave displacement, and sway displacement of the offshore substation platform in real time. The camera is installed above the hook to capture images of the target on the transformer body. The retractable, sealed maintenance compartment is arranged around the transformer to be inspected; The control system drives the hydraulic cylinder, the servo motor on the slide rail, and the hook lifting and lowering actions in coordination based on the signals from the platform attitude sensor and the camera, so that the hook maintains a constant position in the global geodetic coordinate system and achieves active wave compensation.

[0010] Furthermore, the retractable sealed maintenance cabin includes a rigid frame, an electrically retractable sealing wall, and an environmental control system; the electrically retractable sealing wall covers the outside of the rigid frame to form a sealed cabin body.

[0011] Furthermore, the bottom of the electrically retractable sealing enclosure is equipped with an inflatable sealing strip for sealing with the offshore substation platform.

[0012] Furthermore, the environmental control system includes a high-efficiency filtration unit, an air conditioning unit, and a dehumidification pipeline connected in sequence, used to maintain positive pressure inside the cabin, control temperature and humidity, and filter salt mist and dust.

[0013] Furthermore, taking the extension direction of the slide rail as the left-right direction, the hook moves in the left-right direction to compensate for sway; the direction perpendicular to the slide rail is the front-back direction; the four supporting columns are located at the left front, left rear, right front, and right rear positions respectively, and the corresponding four hydraulic cylinders are called the left front hydraulic cylinder, left rear hydraulic cylinder, right front hydraulic cylinder, and right rear hydraulic cylinder respectively; when the offshore substation platform sways, the control system calculates the target height of each hydraulic cylinder according to the following formula: Left front hydraulic cylinder: h_leftfront_des = h0 + (L / 2)·tan(-θr) + (W / 2)·tan(-θp) -Δz; Left rear hydraulic cylinder: h_leftrear_des = h0 + (L / 2)·tan(-θr) - (W / 2)·tan(-θp) -Δz; Right front hydraulic cylinder: h_rightfront_des = h0 - (L / 2)·tan(-θr) + (W / 2)·tan(-θp)- Δz; Right rear hydraulic cylinder: h_rightrear_des = h0 - (L / 2)·tan(-θr) - (W / 2)·tan(-θp) -Δz; Where h0 is the initial height of the hydraulic cylinder, L is the distance between the support columns on the left and right sides, W is the distance between the support columns on the front and rear sides, θr is the roll angle, θp is the pitch angle, and Δz is the heave displacement.

[0014] Furthermore, in the sway compensation, the control system drives the hook to move in the opposite direction through the servo motor on the slide rail. The target horizontal position is xdes = x0 - Δx, where x0 is the initial mid-position coordinate of the hook and Δx is the sway displacement.

[0015] Furthermore, each hydraulic cylinder is equipped with a built-in magnetostrictive displacement sensor for real-time feedback of the actual height of the hydraulic cylinder; the control system uses a PID algorithm to independently control each electro-hydraulic servo valve, and calculates the difference between the target height and the actual height of the hydraulic cylinder according to the proportional, integral and derivative terms, and outputs a control signal to drive the electro-hydraulic servo valve to move, so that the actual height of the hydraulic cylinder tracks the target height.

[0016] Furthermore, the platform attitude sensor employs a fiber optic gyroscope inertial navigation measurement unit.

[0017] Furthermore, the slide rail is equipped with a servo motor and a ball screw to drive the hook to move horizontally along the slide rail; a lifting winch is provided above the hook, driven by a servo motor, and the hook height is fed back by an encoder.

[0018] This invention discloses a method for core-lifting maintenance of transformers on offshore wind power platforms using the aforementioned equipment, comprising the following steps: The intelligent spreader system is transported to the offshore substation platform and leveled and fixed using a support base and hydraulic cylinders; a retractable and sealed maintenance cabin is installed and positioned around the transformer to be inspected. The transformer oil draining, bushing removal, and upper connection parts removal were completed inside the retractable and sealed maintenance compartment. The intelligent lifting system is activated. The control system drives the hydraulic cylinder, the servo motor on the slide rail, and the lifting and lowering of the hook in coordination with the signals from the platform attitude sensor and camera. This achieves active wave compensation, keeps the hook in a constant position in the global geodetic coordinate system, and smoothly lifts the transformer body out and transfers it to the maintenance area inside the cabin. Core inspection and repair are carried out inside the retractable, sealed maintenance cabin; The device body is reassembled using an intelligent lifting system to complete oiling and sealing.

[0019] Compared with the prior art, the present invention has the following beneficial technical effects: This invention discloses an integrated core-lifting maintenance device for offshore wind power platform transformers, comprising an intelligent lifting system and a retractable sealed maintenance cabin. The device clarifies the installation positions and interrelationships of each component on the offshore substation platform. The control system, based on attitude sensors and camera signals, drives the coordinated lifting and lowering of hydraulic cylinders, slide rail servo motors, and hooks to achieve active wave compensation, ensuring the hook maintains a constant global position on the swaying platform. Integrating the intelligent lifting system and the retractable sealed maintenance cabin avoids exposure of the transformer body to high-humidity salt spray environments and solves the problem of traditional cranes being unable to operate stably on swaying decks. This significantly reduces dependence on weather windows and improves maintenance safety and operational efficiency.

[0020] Furthermore, the retractable sealed maintenance compartment includes a rigid frame, an electrically retractable sealed enclosure, and an environmental control system. The enclosure covers the frame to form a sealed compartment. This allows for the rapid construction of a detachable sealed space, adapting to the limited space on offshore platforms and providing a basic structure for subsequent environmental control. The electrically retractable design also facilitates transportation and deployment, reducing on-site preparation time.

[0021] Furthermore, an inflatable sealing strip is installed at the bottom of the sealed bulkhead to seal with the platform deck. This effectively prevents external humid salt spray air from intruding from the bottom, ensuring positive pressure is maintained inside the compartment. At the same time, the inflation method can adapt to unevenness on different deck surfaces, improving sealing reliability.

[0022] Furthermore, the environmental control system includes high-efficiency filtration units, air conditioning units, and dehumidification piping to maintain positive pressure, temperature, humidity, and filter salt spray and dust. This creates a dry and clean maintenance microenvironment (e.g., dew point ≤ -40℃) in the high-humidity, high-salt-spray marine environment, preventing moisture absorption that could lead to insulation degradation and allowing core-lifting maintenance to be carried out under controlled conditions, largely unaffected by sudden weather changes.

[0023] Furthermore, the coordinate definition for wave compensation, the column grouping, and the calculation formula for the target height of the hydraulic cylinders were clarified. The slide rail direction is used for left-right sway compensation, and the vertical direction for forward-backward compensation, with four hydraulic cylinders independently controlled. The effect is that by calculating the target height of each cylinder using quantitative formulas, precise reverse compensation for roll, pitch, and heave is achieved, ensuring the hook remains stable in the global coordinate system. The theoretical basis is clear, the feasibility is strong, and the compensation accuracy is high.

[0024] Furthermore, a specific sway compensation method is defined, which involves driving a servo motor on the slide rail to move the hook in the opposite direction by the same distance based on the sway displacement Δx. This eliminates the influence of platform lateral drift on the horizontal position of the hook, ensuring that the hook is aligned with the transformer body in the horizontal plane and avoiding lateral collisions during hoisting.

[0025] Furthermore, each hydraulic cylinder is equipped with a built-in magnetostrictive displacement sensor, and the control system uses a PID algorithm to drive the electro-hydraulic servo valve based on the difference between the target height and the actual height. The effect is: to achieve closed-loop high-precision position control of the hydraulic cylinders, to adjust the extension and retraction of each cylinder in real time, to ensure fast and smooth compensation actions, and the PID algorithm is mature, reliable, and easy to implement in engineering.

[0026] This invention also discloses a method for core-lifting maintenance of transformers on offshore wind power platforms using the aforementioned equipment. The method comprehensively includes steps from platform deployment, environmental preparation, transformer pretreatment, integrated core-lifting operation, in-cabin maintenance, to post-reassembly processing. It organically links the establishment of the sealed cabin, active wave-compensated lifting, and controlled-environment maintenance into a standardized operating procedure that can be implemented on-site at sea. This significantly shortens the maintenance cycle and power outage time, reduces operation and maintenance costs, and leverages the structural and functional advantages of the aforementioned equipment at each step, ensuring the safety and reliability of the entire maintenance process. Attached Figure Description

[0027] Figure 1 This is a commercial overall installation diagram of the maintenance equipment of the present invention; Figure 2 This is a three-dimensional structural diagram of the intelligent lifting device system; Figure 3 A front view of the intelligent lifting device servo; Figure 4 A three-dimensional structural diagram of a retractable, sealed maintenance compartment; Figure 5 This is a schematic diagram of the environmental control system for a retractable, sealed maintenance cabin.

[0028] In the picture: 1. Offshore substation platform; 2. Intelligent lifting system; 3. Retractable sealed maintenance cabin; 4. Transformer to be inspected; 21. Support column; 22. Crossbeam; 23. Slide rail; 24. Hook; 25. Support base; 26. Camera; 27. Hydraulic cylinder; 31. Rigid frame; 32. Electric retractable sealed enclosure; 33. High-efficiency filter unit; 34. Air conditioning unit; 35. Dehumidification piping. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the present invention clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention; that is, the described embodiments are only a part of the embodiments of the present invention, and not all of them.

[0030] The components described and illustrated in the accompanying drawings and embodiments of this invention can be arranged and designed in various different configurations. Therefore, the detailed description of the embodiments of the invention provided in the following drawings is not intended to limit the scope of the claimed invention, but merely to illustrate one selected embodiment of the invention. All other embodiments obtained by those skilled in the art based on the accompanying drawings and embodiments of this invention without inventive effort are within the scope of protection of this invention.

[0031] The features and performance of the present invention will be further described in detail below with reference to embodiments.

[0032] like Figure 1 As shown, this invention discloses an integrated core-lifting maintenance device for offshore wind power platform transformers, comprising an offshore substation platform 1, an intelligent lifting system 2, and a retractable sealed maintenance cabin 3. The intelligent lifting system 2 and the retractable sealed maintenance cabin 3 are installed on the offshore substation platform 1. The intelligent lifting system 2 is installed inside the retractable sealed maintenance cabin 3. The transformer 4 to be maintained is already on the offshore substation platform 1 after leaving the factory. During maintenance, the retractable sealed maintenance cabin 3 surrounds the transformer, and maintenance is carried out within the formed sealed cabin.

[0033] like Figure 2 and Figure 3 As shown, the intelligent lifting system 2 includes a support frame and a control system. A slide rail 23 is installed on the support frame, and a hook 24 is installed below the slide rail 23. The support frame includes four support columns 21 and four crossbeams 22. The four crossbeams 22 are connected to the top of the four support columns 21, forming a rectangular frame. The slide rail is installed below two of the crossbeams 22. The hook 24 moves horizontally along the slide rail 23, and the hook 24 lifts the transformer 4 via a wire rope.

[0034] A support base 25 is installed at the bottom of each support column 21. A hydraulic cylinder 27 is provided between the support base 25 and the support column 21. The support base 25 is bolted to the offshore substation platform 1.

[0035] A camera 26 is installed above the hook 24 to capture real-time images of the target on the transformer body. The camera 26 is a high-definition industrial camera with night vision and dustproof and waterproof functions. It is used to monitor the position of the hook 24, the attitude of the transformer body, the lifting gap, and the working conditions inside the cabin in real time, providing visual feedback to the control system.

[0036] A platform attitude sensor is installed at the geometric center of the support base 25. The sensor uses a fiber optic gyroscope inertial navigation measurement unit and can measure the roll angle, pitch angle, heave displacement and sway displacement of the offshore booster station platform 1 in real time.

[0037] Specifically, the slide rail 23 is equipped with a servo motor and a ball screw to drive the hook to move along the X direction.

[0038] A lifting winch is installed above the hook 24, driven by a servo motor, and the hook height is fed back by an encoder.

[0039] When the offshore substation platform 1 sways due to wave action, the platform attitude sensor transmits real-time attitude data to the control system at a frequency of no less than 100Hz. Based on this data, the control system calculates the compensation amount for each actuator and drives the hydraulic cylinder 27, the servo motor on the slide rail 23, and the lifting winch of the hook to work together, so that the hook 24 maintains a constant position in the global geodetic coordinate system, thereby achieving active wave compensation.

[0040] The specific compensation methods are as follows: First, define the direction: such as... Figure 2 As shown, with the extension direction of the slide rail 23 as the left-right direction, the hook 24 moves in the left-right direction to compensate for sway; the direction perpendicular to the slide rail is the front-back direction. The four support columns 21 are located at the left front, left rear, right front, and right rear positions, respectively. The four corresponding hydraulic cylinders 27 are called the left front hydraulic cylinder, left rear hydraulic cylinder, right front hydraulic cylinder, and right rear hydraulic cylinder, respectively.

[0041] Assume that when the offshore substation platform 1 is horizontal and stationary, the initial height of each hydraulic cylinder is h0 (referring to the extension length of the hydraulic cylinder, so that the hook is at the predetermined working height). The distance between the left and right columns is L, and the distance between the front and rear columns is W.

[0042] When the offshore substation platform 1 sways due to wave action, the platform attitude sensor measures the following parameters in real time: roll angle θr (rotation around the front and rear axes, with the right side being positive), pitch angle θp (rotation around the left and right axes, with the front side being positive), heave displacement Δz (upward being positive), and sway displacement Δx (along the left and right direction, with the right side being positive).

[0043] The control system calculates the target height of each hydraulic cylinder and the target horizontal position of the hook based on the above parameters, as follows: (a) Roll compensation The rolling motion causes the offshore substation platform 1 to tilt around its front-rear axis, resulting in the right-side column rising or falling relative to the left-side column. To counteract the effect of the rolling motion on the horizontal position of the hook, the control system adjusts the height of the hydraulic cylinders on both sides, causing the entire frame to tilt in opposite directions at the same angle. The target height of the two left-side hydraulic cylinders (left front and left rear) increases by (L / 2)·tan(-θr) compared to the initial height, while the target height of the two right-side hydraulic cylinders (right front and right rear) decreases by (L / 2)·tan(-θr) compared to the initial height. That is: Target height of the left front hydraulic cylinder: h_leftfront_des = h0 + (L / 2)·tan(-θr) Target height of the left rear hydraulic cylinder: h_leftrear_des = h0 + (L / 2)·tan(-θr) Target height of the right front hydraulic cylinder: h_rightfront_des = h0 - (L / 2)·tan(-θr) Target height of the right rear hydraulic cylinder: h_rightrear_des = h0 - (L / 2)·tan(-θr) (ii) Sway compensation The pitching motion causes the offshore substation platform 1 to tilt around its left and right axes, resulting in the front columns rising or falling relative to the rear columns. To counteract the pitching effect, the control system adjusts the height of the hydraulic cylinders on both the front and rear sides, causing the frame to tilt in the opposite direction. The target height of the two front hydraulic cylinders (left front and right front) increases by (W / 2)·tan(-θp) compared to the initial height, while the target height of the two rear hydraulic cylinders (left rear and right rear) decreases by (W / 2)·tan(-θp) compared to the initial height. The pitch compensation is then superimposed on the roll compensation. Target height of the left front hydraulic cylinder: h_leftfront_des = h0 + (L / 2)·tan(-θr) + (W / 2)·tan(-θp) Target height of the left rear hydraulic cylinder: h_leftrear_des = h0 + (L / 2)·tan(-θr) - (W / 2)·tan(-θp) Target height of the right front hydraulic cylinder: h_rightfront_des = h0 - (L / 2)·tan(-θr) + (W / 2)·tan(-θp) Target height of the right rear hydraulic cylinder: h_rightrear_des = h0 - (L / 2)·tan(-θr) - (W / 2)·tan(-θp) (iii) Heave compensation The platform's heave motion causes a change in overall height. To maintain a constant absolute hook height, the four hydraulic cylinders should synchronously rise and fall in opposite directions. Assuming the upward heave displacement Δz is positive, the target height of each hydraulic cylinder should be calculated by subtracting Δz from the aforementioned tilt adjustment (i.e., synchronously lowering Δz). After comprehensive heave compensation, the target height of each hydraulic cylinder is: h_leftfront_des = h0 + (L / 2)·tan(-θr) + (W / 2)·tan(-θp) - Δz h_leftrear_des = h0 + (L / 2)·tan(-θr) - (W / 2)·tan(-θp) - Δz h_rightfront_des = h0 - (L / 2)·tan(-θr) + (W / 2)·tan(-θp) - Δz h_rightrear_des = h0 - (L / 2)·tan(-θr) - (W / 2)·tan(-θp) - Δz The hydraulic cylinder is used to compensate for the large height changes caused by the platform's rise and fall (stroke ±150mm), while the winch is only used to fine-tune the relative height between the hook and the body (stroke ±50mm). The two work in series: the control system first eliminates the platform's rise and fall displacement through the hydraulic cylinder, and then the winch makes millimeter-level fine adjustments based on the vertical distance between the hook and the body fed back by the camera.

[0044] (iv) Sway compensation The platform's swaying motion causes the hook, along with the entire frame, to drift in the left-right direction. Assuming the sway displacement Δx to the right is positive, the control system drives the hook 24 to move the same distance to the left in the opposite direction via the servo motor on slide rail 23. This results in the target horizontal position xdes = x0 - Δx, where x0 is the initial midpoint coordinate of the hook on the slide rail. The horizontal movement of the hook is achieved by a ball screw pair, and the encoder of the servo motor provides closed-loop position feedback.

[0045] (v) Execution and Control Each hydraulic cylinder is equipped with a built-in magnetostrictive displacement sensor with an accuracy of ±0.5mm, providing real-time feedback on the actual height. The control system uses a PID algorithm to independently control each electro-hydraulic servo valve, with the control law as follows: u_i = K_p·e_i + K_i·∫e_i dt + K_d·(de_i / dt) Where e_i is the difference between the target height and the actual height of the i-th hydraulic cylinder. After on-site tuning, typical control parameters are set to K_p=3, Ki=0.8, and K_d=0.2. The control frequency is set to 200Hz, and the actuator response delay is less than 10ms.

[0046] Meanwhile, the camera 26 above the hook captures the target image on the transformer body. After binocular vision calculation, the relative pose deviation between the hook and the transformer body is obtained. This deviation is then filtered by a low-pass filter and superimposed on the instructions of the aforementioned actuators to form a visual closed-loop correction, thereby improving the hoisting accuracy to within ±2mm.

[0047] (vi) Safety Protection When the extension or retraction of any hydraulic cylinder 27 exceeds ±150mm, or the absolute value of the platform's roll angle exceeds 5°, or the absolute value of the platform's pitch angle exceeds 5°, or the platform's sway frequency exceeds 1Hz, the control system immediately issues an audible and visual alarm, automatically cuts off the compensation mode, locks all hydraulic cylinders in their current positions, and simultaneously reduces the lifting speed of the hook 24 to below a safe value. The locking function is achieved by a hydraulic lock within the electro-hydraulic servo valve, which can maintain the load even after power failure.

[0048] Through the above compensation methods, even if the offshore substation platform 1 experiences swaying, pitching, heave, and rolling, the hook can still maintain a basically constant position in the global geodetic coordinate system, thereby ensuring the stability and accuracy of the transformer body lifting and reinstallation operations.

[0049] like Figure 4 and Figure 5 As shown, the retractable sealed maintenance compartment 3 surrounds the transformer 4 to be inspected and is linked to the intelligent lifting system 2. The retractable sealed maintenance compartment 3 includes a rigid frame 31, an electrically retractable sealed enclosure 32, and an environmental control system.

[0050] The rigid frame 31 is a segmented quick-release aluminum alloy frame, consisting of uprights, horizontal bars, and diagonal braces, which can be quickly assembled into a rectangular enclosure structure.

[0051] The electrically retractable sealing enclosure 32 is made of flame-retardant PVC-coated composite film. The flame-retardant PVC-coated composite film is driven to retract by an electric roller and covers the outside of the rigid frame 31 to form a sealed chamber.

[0052] Even better, the bottom of the electrically retractable sealing enclosure 32 is equipped with an inflatable sealing strip to completely seal it with the offshore booster station platform 1.

[0053] The inflatable sealing strip can be made of EPDM hollow tubing, which is connected to a micro electric air pump (installed outside the cabin) through a pressure-resistant hose. The solenoid valve controls the inflation pressure to 0.2-0.3 MPa, so that the sealing strip expands and fits tightly against the offshore booster station platform 1.

[0054] The environmental control system includes a high-efficiency filter unit 33, an air conditioning unit 34, and a dehumidification pipeline 35 connected in sequence. The high-efficiency filter unit 33 is located outside the cabin. The high-efficiency filter unit 33 removes dust and salt mist from the outside air. After the air conditioning unit 34 controls the temperature, the air is then deeply dehumidified through the dehumidification pipeline 35 to obtain dry air. At the same time, there is a return air vent inside the cabin to form a circulation.

[0055] Specifically, the dehumidification duct 35 incorporates a rotary dehumidifier. The rotor is made of silica gel or molecular sieve material and is divided into a treatment zone and a regeneration zone. Pre-cooled air from the air conditioning unit 34 absorbs moisture as it passes through the treatment zone, resulting in a dew point below -50°C after drying. The regeneration zone uses an electric heater to provide hot air at 120–140°C to expel the absorbed moisture outside the cabin. A dew point meter monitors the outlet dew point in real time, and the rotor speed is adjusted via frequency conversion to maintain a temperature ≤-40°C.

[0056] The cabin maintains a slight positive pressure of +5 to +20 Pa, a dew point of ≤-40℃, a relative humidity of ≤30%, and a temperature of 15 to 30℃, effectively filtering salt mist and dust to create a dry, clean, and sealed microenvironment.

[0057] The chamber integrates temperature and humidity monitors and pressure gauges to monitor internal temperature, humidity, dew point, and positive pressure parameters; it also has a remote expert support interface to support real-time parameter display, anomaly alarms, data storage, and remote control.

[0058] This invention also discloses a method for overhauling the core of an offshore wind power platform transformer, comprising the following steps: Platform deployment and environmental preparation: Select a stable weather window of ≥48 hours, transport the intelligent spreader system 2 to the offshore booster station platform 1, quickly assemble and level it; install the retractable sealed maintenance cabin 3, start the environmental control system, and adjust the parameters inside the cabin to the standard within 2-4 hours to establish a stable, dry and clean microenvironment.

[0059] Transformer pretreatment: The transformer oil is drained, the bushings and upper connecting parts are removed inside the compartment, and the opening of the tank is covered to prevent foreign objects from entering.

[0060] Integrated core lifting operation: Activate the intelligent lifting system 2, turn on the dynamic compensation function, and smoothly and vertically lift the core out of the cabin and transfer it to the preset maintenance support area inside the cabin.

[0061] Controlled maintenance inside the cabin: Conduct core inspections, troubleshooting, and component repairs in accordance with procedures within a dry and clean cabin.

[0062] Reassembly and post-processing: After the overhaul is completed, the device body is precisely reassembled using intelligent lifting tools to complete post-processing work such as oiling, sealing, and pressure testing.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the protection scope of the present invention.

Claims

1. An offshore wind power platform transformer integrated hanger center maintenance device, characterized in that, Includes an intelligent lifting device system (2) and a retractable sealed maintenance cabin (3): The transformer (4), intelligent lifting system (2) and retractable sealed maintenance cabin (3) to be inspected are installed on the offshore substation platform (1), and the transformer (4) and intelligent lifting system (2) to be inspected are located in the cabin of the retractable sealed maintenance cabin (3). The intelligent lifting system (2) includes a support frame, a slide rail (23), a hook (24), a platform attitude sensor, a camera (26), and a control system; the support frame includes four support columns (21) and four crossbeams (22), the four crossbeams are connected to the top of the four support columns to form a rectangular frame; the slide rail (23) is installed below the two crossbeams (22), the hook (24) is installed on the slide rail (23) and moves horizontally along the slide rail (23); each support column (21) has a support base (25) at its bottom, and a hydraulic cylinder (27) is provided between the support base and the support column; the platform attitude sensor is installed at the geometric center of the offshore substation platform (1) and is used to measure the roll angle, pitch angle, heave displacement and sway displacement of the offshore substation platform (1) in real time; the camera (26) is installed above the hook (24) and is used to collect target images on the transformer (4) body; The retractable sealed maintenance compartment (3) is arranged around the transformer (4) to be maintained; The control system drives the hydraulic cylinder (27), the servo motor on the slide rail (23) and the hook (24) to lift and move in coordination according to the signals from the platform attitude sensor and the camera (26), so that the hook (24) maintains a constant position in the global geodetic coordinate system and realizes active wave compensation.

2. The offshore wind platform transformer integrated well center maintenance device according to claim 1, characterized in that, The retractable sealed maintenance cabin (3) includes a rigid frame (31), an electrically retractable sealed enclosure (32), and an environmental control system; the electrically retractable sealed enclosure (32) covers the outside of the rigid frame (31) to form a sealed cabin.

3. The offshore wind platform transformer integrated well center maintenance device according to claim 2, characterized in that, The bottom of the electrically retractable sealing enclosure (32) is provided with an inflatable sealing strip for sealing with the offshore booster station platform (1).

4. The offshore wind platform transformer integrated well center maintenance device according to claim 2, characterized in that, The environmental control system includes a high-efficiency filter unit (33), an air conditioning unit (34), and a dehumidification pipeline (35) connected in sequence, which are used to maintain positive pressure in the cabin, control temperature and humidity, and filter salt mist and dust.

5. The offshore wind platform transformer integrated well center maintenance device according to claim 1, characterized in that, With the extension direction of the slide rail (23) as the left and right direction, the hook (24) moves in the left and right direction to compensate for sway; the direction perpendicular to the slide rail is the front and back direction; the four supporting columns (21) are located at the left front, left rear, right front, and right rear positions respectively, and the corresponding four hydraulic cylinders (27) are called the left front hydraulic cylinder, left rear hydraulic cylinder, right front hydraulic cylinder, and right rear hydraulic cylinder respectively; when the offshore booster station platform (1) shakes, the control system calculates the target height of each hydraulic cylinder according to the following formula: Left front hydraulic cylinder: h_leftfront_des = h0 + (L / 2)·tan(-θr) + (W / 2)·tan(-θp) - Δz; Left rear hydraulic cylinder: h_leftrear_des = h0 + (L / 2)·tan(-θr) - (W / 2)·tan(-θp) - Δz; Right front hydraulic cylinder: h_rightfront_des = h0 - (L / 2)·tan(-θr) + (W / 2)·tan(-θp) - Δz; Right rear hydraulic cylinder: h_rightrear_des = h0 - (L / 2)·tan(-θr) - (W / 2)·tan(-θp) - Δz; Where h0 is the initial height of the hydraulic cylinder (27), L is the distance between the support columns on the left and right sides, W is the distance between the support columns on the front and rear sides, θr is the roll angle, θp is the pitch angle, and Δz is the heave displacement.

6. The offshore wind platform transformer integrated well center maintenance device according to claim 1, characterized in that, In the sway compensation, the control system drives the hook (24) to move in the opposite direction through the servo motor on the slide rail (23). The target horizontal position xdes = x0 - Δx, where x0 is the initial mid-position coordinate of the hook and Δx is the sway displacement.

7. The offshore wind platform transformer integrated well center maintenance device according to claim 1, characterized in that, Each hydraulic cylinder (27) is equipped with a magnetostrictive displacement sensor for real-time feedback of the actual height of the hydraulic cylinder (27). The control system uses a PID algorithm to independently control each electro-hydraulic servo valve. Based on the difference between the target height and the actual height of the hydraulic cylinder (27), the system calculates the difference using proportional, integral, and derivative terms, and outputs a control signal to drive the electro-hydraulic servo valve to move, so that the actual height of the hydraulic cylinder (27) tracks the target height.

8. The offshore wind platform transformer integrated well center maintenance device according to claim 1, characterized in that, The platform attitude sensor uses a fiber optic gyroscope inertial navigation measurement unit.

9. The offshore wind platform transformer integrated well center maintenance device according to claim 1, characterized in that, The slide rail (23) is equipped with a servo motor and a ball screw to drive the hook (24) to move horizontally along the slide rail direction; a lifting winch is provided above the hook (24), driven by a servo motor, and the hook height is fed back by an encoder.

10. A method for offshore wind platform transformer top joint maintenance using the apparatus of any one of claims 1-9, characterized in that, Includes the following processes: The intelligent lifting system (2) is transported to the offshore substation platform (1) and leveled and fixed by the support base (25) and hydraulic cylinder (27); the retractable sealed maintenance cabin (3) is installed and arranged around the transformer (4) to be maintained; The transformer (4) is drained of oil, and the bushings and upper connecting parts are removed inside the retractable sealed maintenance compartment (3). Start the intelligent lifting system (2), and through the control system, drive the hydraulic cylinder (27), the servo motor on the slide rail (23) and the lifting and lowering coordinated action of the hook (24) according to the signals of the platform attitude sensor and camera (26) to achieve active wave compensation, so that the hook (24) maintains a constant position in the global geodetic coordinate system, and smoothly lifts the transformer (4) body out and transfers it to the maintenance area inside the cabin; Core inspection and repair are carried out inside the retractable sealed maintenance cabin (3); The body is reinstalled using the intelligent lifting system (2) to complete the oiling and sealing.

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