Method and system for measuring weight center of gravity of floating type offshore wind turbine generator

Abstract

The invention discloses a method and system for measuring the weight center of gravity of a floating type offshore wind turbine generator, and the method comprises the steps: carrying out the statistics of the simulation weight center of gravity information of each subsystem of the floating type offshore wind turbine generator, and obtaining the theoretical weight center of gravity calculation value of each subsystem of the floating type offshore wind turbine generator; measuring the draft depth change and the weight center-of-gravity position of the floating body of the floating type offshore wind turbine generator at each installation stage; according to the draft depth change and the weight gravity center position of the floating body in each installation stage, fitting a theoretical weight gravity center calculation value to optimize simulation modeling of each subsystem of the floating type offshore wind turbine generator, carrying out weight gravity center superposition calculation on the floating type offshore wind turbine generator, and comparing a superposition calculation result with the simulation modeling in the same period; the problem that the floating type offshore wind turbine generator cannot meet the inclination test requirement due to the too small heeling angle is solved, the weight center of gravity of each subsystem is controlled in the construction process, and finally the overall weight center of gravity data as accurate as possible after construction is completed is obtained.

Description

Technical Field

[0001] The present invention relates to the technical field of measuring the weight center of gravity of an offshore wind turbine generator set, and in particular to a method and system for measuring the weight center of gravity of a floating offshore wind turbine generator set. Background Art

[0002] Floating offshore wind turbines or ship systems are large and complex in structure, which inevitably leads to construction deviations during the construction process. After the floating body is built, its actual weight and center of gravity position values ​​are different from the designed values. Since the weight and center of gravity data are extremely important to the stability of the floating body, the actual weight and center of gravity height of the floating body must be measured after the construction is completed to ensure the safe operation of the unit.

[0003] The tilt test is an effective method to determine the actual weight and center of gravity of the floating body after completion by inclining the floating body. The current conventional scheme for conducting the tilt test is to load weights on the floating body or adjust the ballast water, read the draft data of six measuring positions on the bow, midship and stern of the left and right sides of the floating body, and calculate the weight and center of gravity height of the floating body by measuring the tilt angle and tilt moment generated by the known weight movement of the floating body.

[0004] Unlike ships, floating offshore wind turbines have a smaller inclination angle after loading weights or adjusting ballast water, and the maximum heel angle is generally less than 1. According to the CB / T 3035-2005 Ship Inclination Test standard, the moving weight used in the test should be sufficient to produce a 2° to 4° heel angle on each side of the ship. If it is difficult to meet this requirement due to the ship type or conditions, the minimum heel angle on each side should not be less than 1°, but floating offshore wind turbines often cannot meet the minimum heel angle requirements in the inclination test specifications, so it is necessary to study a new floating weight center of gravity determination method to replace the inclination test. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and propose a method and system for measuring the weight center of gravity of a floating offshore wind turbine, so as to solve the problem that the floating offshore wind turbine cannot meet the minimum heel angle requirement of the tilt test due to the small heel angle. The simulation model is updated according to the measured data of each stage in the construction process, and the actual floating body data is compared with the theoretical calculated value at the same time. The weight center of gravity of each subsystem is controlled during the construction process, and finally the overall weight center of gravity data that is as accurate as possible after the construction is completed is obtained.

[0006] The object of the present invention is achieved through the following technical scheme: a method for determining the weight center of gravity of a floating offshore wind turbine, which method is to obtain and count the weight center of gravity information of the simulation modeling of each subsystem of the floating offshore wind turbine, determine the weight of each subsystem of the floating offshore wind turbine and the longitudinal and vertical center of gravity position of each subsystem, and simultaneously calculate the theoretical weight center of gravity calculated value of each subsystem, and check the measured weight center of gravity value with the theoretical weight center of gravity calculated value to obtain the measured weight center of gravity value; then measure the draft depth change and weight center of gravity position of the floating body of the floating offshore wind turbine at each installation stage; according to the draft depth change and weight center of gravity position of the floating body at each installation stage, the theoretical weight center of gravity calculated value is fitted, and the simulation modeling of each subsystem of the floating offshore wind turbine is further optimized, and the actual weight center of gravity of each installation stage of the floating offshore wind turbine is superimposed, and the superimposed calculation result is compared with the simulation modeling of the same period, and finally the weight center of gravity determination of the floating offshore wind turbine is completed.

[0007] Further, the method comprises the following steps:

[0008] S1. Obtain and count the weight center of gravity information of the simulation modeling structure of each subsystem of the floating offshore wind turbine, use three-dimensional modeling software to calculate the physical properties of each component of the floating offshore wind turbine to obtain the weight center of gravity information of each component, perform refined modeling, and the modeling degree is accurate to bolts and gaskets, and count the weight center of gravity data of each subsystem modeling component respectively; at the same time, use the on-site crane to weigh each subsystem of the floating offshore wind turbine and measure the longitudinal and vertical center of gravity position of each subsystem, and calculate the weight center of gravity calculated value of each subsystem at the same time, and check the measured weight center of gravity value with the weight center of gravity calculated value to obtain the measured weight center of gravity value;

[0009] S2. At the installation dock of the floating offshore wind turbine, during the hoisting process of the floating offshore wind turbine, use the water gauge of the floating offshore wind turbine to measure the draft of the floating offshore wind turbine at each installation stage, and measure the seawater density at the site to obtain the draft change and weight center position of the floating offshore wind turbine at each installation stage;

[0010] S3. Compare and fit the draft changes and weight center of gravity positions of floating offshore wind turbines at each installation stage with the theoretical weight center of gravity calculation values ​​to adjust the weight center of gravity information of the simulation modeling, thereby controlling the weight center of gravity of each subsystem of the floating offshore wind turbine during the construction process, and statistically analyze the center of gravity position information of the floating body at each stage. Use the weight center of gravity superposition method to simulate and calculate the center of gravity height of each stage, compare the superposition calculation results with the simulation modeling of the same period, and finally obtain the weight and center of gravity results of the floating wind turbine.

[0011] Further, the step S1 comprises:

[0012] The subsystem includes an impeller assembly, a main engine assembly, a tower assembly, a basic buoy assembly and a turret structure.

[0013] Further, the step S1 comprises:

[0014] Use a crane on site to weigh each subsystem of the floating offshore wind turbine and measure the longitudinal and vertical center of gravity positions of each subsystem, and calculate the weight center of gravity value of each subsystem. Verify the measured weight center of gravity value with the weight center of gravity value to obtain the measured weight center of gravity value, including the following steps:

[0015] S1.1. Set two supports and fixtures at the bottom of the subsystem, and hang the two hooks of the crane with weight sensors on the preset lifting ears on the left and right sides of the subsystem respectively. Set the lifting ears on the left and right sides of the subsystem as point A and point B, the center point of one support as point C, and the center point of the other support as point D;

[0016] S1.2. The distance between the lifting eye at point A and the center point of the support at point C is L A , the distance between the lifting eye at point B and the center point of the support at point D is L B , the distance between point C and point D is L, assuming that the distance between the subsystem's center of gravity point G and the center of the support point D is X, and the weight of the subsystem is M;

[0017] Lift the lifting lug at point A vertically, record the crane weighing reading, and subtract the weight of the tooling to get m. A ;

[0018] Lift the lifting lug at point B vertically, record the crane weighing reading, and subtract the weight of the tooling to get m. B ;

[0019] According to the moment balance principle, the following formula is obtained:

[0020] m A L A =M(LX) (1);

[0021] m B L B =MX (2);

[0022] Adding equation (1) and equation (2) gives m A L A +m B L B =ML;

[0023] The weight of the subsystem is obtained as:

[0024] According to formula (2), the longitudinal position of the center of gravity is:

[0025] S1.3. Measure the distance h from the center point of the lifting eyelet at point B to the bottom surface of the subsystem 1 ; Lift the lifting lug at point B vertically, and measure the lifting height as h 2 , record the crane weighing reading, minus the tooling weight, which is m B , at this time the angle between the subsystem and the ground is θ, then:

[0026]

[0027] According to the state after lifting, the moment balance principle is applied to obtain the following formula:

[0028] m B (L B -h 1 tanθ)cosθ=M(XZ G tanθ)cosθ (4);

[0029] The vertical position of the subsystem center of gravity is obtained as:

[0030] S1.4. Check the measured weight center of gravity value with the weight, vertical and longitudinal calculated values ​​of the center of gravity to obtain the actual measured weight center of gravity value.

[0031] Further, the step S2 comprises:

[0032] The installation stages of the floating offshore wind turbine generator system sequentially include a foundation launching stage, a buoy hoisting stage, a tower crane unhooking stage, a main engine hoisting stage, and a rotor hoisting stage.

[0033] Further, the step S3 comprises:

[0034] The draft change and weight center of gravity position of the floating offshore wind turbine in each installation stage are compared and fitted with the theoretical weight center of gravity calculation value to adjust the weight center of gravity information of the simulation modeling, so as to control the weight center of gravity of each subsystem of the floating offshore wind turbine in the construction process. The installation stages of the floating offshore wind turbine include the foundation launching stage, the buoy hoisting stage, the tower crane unhooking stage, the main engine hoisting stage and the impeller hoisting stage in sequence;

[0035] The center of gravity position information of each installation stage is statistically analyzed. The actual vertical height of the center of gravity in the foundation launching stage is based on the center of gravity value calculated by simulation. The superposition calculation result is compared with the simulation modeling of the same period. The center of gravity height of each subsequent installation stage is calculated by the weight center of gravity superposition method. The calculation formula is as follows:

[0036]

[0037] Where, H is the height of the center of gravity of the unit simulation in the next stage; H 1 The simulated center of gravity height of the unit before hoisting; m 1 H is the simulated weight of the unit before hoisting; 2 Simulated center of gravity height of the hoisted component; m 2 Simulate the weight of the hoisted components.

[0038] A system for measuring the weight and center of gravity of a floating offshore wind turbine, used to implement the above-mentioned method for measuring the weight and center of gravity of a floating offshore wind turbine, comprising:

[0039] A simulation weight center of gravity acquisition module is used to acquire and count the weight center of gravity information of the simulation modeling of each subsystem of the floating offshore wind turbine;

[0040] The measured weight center of gravity acquisition module is used to measure and calculate the weight of each subsystem of the floating offshore wind turbine and the longitudinal and vertical center of gravity position of each subsystem, and to verify the measured value with the calculated value to obtain the calculated value of the measured weight center of gravity;

[0041] The weight center of gravity acquisition module is used to obtain the actual draft depth change and weight center of gravity position of the floating body of the floating offshore wind turbine at each installation stage;

[0042] The simulation model optimization module fits the theoretical weight center of gravity calculation value according to the draft depth changes and weight center of gravity position of the floating body at each stage, and further optimizes the simulation modeling of each subsystem of the floating offshore wind turbine;

[0043] The weight center of gravity superposition calculation module is used to superimpose the actual weight center of gravity of the floating offshore wind turbine at each installation stage, and compare the superposition calculation results with the simulation modeling of the same period.

[0044] Furthermore, the measured weight center of gravity acquisition module includes:

[0045] Use the on-site crane to weigh each subsystem of the floating offshore wind turbine and measure the longitudinal and vertical center of gravity positions of each subsystem to obtain the calculated value of the measured weight center of gravity, including the following steps:

[0046] a. Set two supports and fixtures at the bottom of the subsystem, and hang the two hooks of the crane with weight sensors on the preset lifting ears on the left and right sides of the subsystem respectively. Set the lifting ears on the left and right sides of the subsystem as point A and point B, the center point of one support as point C, and the center point of the other support as point D;

[0047] b. The distance between the lifting eye at point A and the center point of the support at point C is L A , the distance between the lifting eye at point B and the center point of the support at point D is LB , the distance between point C and point D is L, assuming that the distance between the subsystem's center of gravity point G and the center of the support point D is X, and the weight of the subsystem is M;

[0048] Lift the lifting lug at point A vertically, record the crane weighing reading, and subtract the weight of the tooling to get m. A ;

[0049] Lift the lifting lug at point B vertically, record the crane weighing reading, and subtract the weight of the tooling to get m. B ;

[0050] According to the moment balance principle, the following formula is obtained:

[0051] m A L A =M(LX) (6);

[0052] m B L B =MX (7);

[0053] Adding equation (6) and equation (7) gives m A L A +m B L B =ML;

[0054] The weight of the subsystem is obtained as:

[0055] According to formula (7), the longitudinal position of the center of gravity is:

[0056] c. Measure the distance h from the center point of the eyelet at point B to the bottom surface of the subsystem 1 ; Lift the lifting lug at point B vertically, and measure the lifting height as h 2 , record the crane weighing reading, minus the tooling weight, which is m B , at this time the angle between the subsystem and the ground is θ, then:

[0057]

[0058] According to the state after lifting, the moment balance principle is applied to obtain the following formula:

[0059] m B (L B -h 1 tanθ)cosθ=M(XZ G tanθ)cosθ (9);

[0060] The vertical position of the subsystem center of gravity is obtained as:

[0061] d. Check the measured weight center of gravity value with the weight, center of gravity vertical and longitudinal calculated values ​​to obtain the actual measured weight center of gravity value.

[0062] Further, the measurement weight center of gravity acquisition module includes:

[0063] At the installation dock of the floating offshore wind turbine, during the hoisting process of the floating offshore wind turbine, the draft of the floating offshore wind turbine at each installation stage is measured using the water gauge provided by the floating offshore wind turbine. At the same time, the seawater density at the site is measured to obtain the draft changes and weight center position of the floating offshore wind turbine at each installation stage.

[0064] Furthermore, the weight center of gravity superposition calculation module includes:

[0065] The draft change and weight center of gravity position of the floating offshore wind turbine in each installation stage are compared and fitted with the theoretical weight center of gravity calculation value to adjust the weight center of gravity information of the simulation modeling, so as to control the weight center of gravity of each subsystem of the floating offshore wind turbine in the construction process. The installation stages of the floating offshore wind turbine include the foundation launching stage, the buoy hoisting stage, the tower crane unhooking stage, the main engine hoisting stage and the impeller hoisting stage in sequence;

[0066] The center of gravity position information of each installation stage is statistically analyzed. The actual vertical height of the center of gravity in the foundation launching stage is based on the center of gravity value calculated by simulation. The superposition calculation result is compared with the simulation modeling of the same period. The center of gravity height of each subsequent installation stage is calculated by the weight center of gravity superposition method. The calculation formula is as follows:

[0067]

[0068] Where, H is the height of the center of gravity of the unit simulation in the next stage; H 1 The simulated center of gravity height of the unit before hoisting; m 1 H is the simulated weight of the unit before hoisting; 2 Simulated center of gravity height of the hoisted component; m 2 Simulate the weight of the hoisted components.

[0069] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0070] 1. The present invention adopts the method of weight center of gravity superposition to calculate the center of gravity position of each installation stage during the construction process of the floating body of the floating offshore wind turbine, thereby avoiding the difficulty of the floating offshore wind turbine being unable to carry out the tilt test due to the small heel angle;

[0071] 2. The present invention can control the weight center of gravity of the floating body of the floating offshore wind turbine during the construction process by checking the theoretical and actual weight center of gravity of each subsystem, thereby avoiding a large error with the design value after the construction is completed;

[0072] 3. The present invention avoids the measurement error of the floating body weight of the floating offshore wind turbine set caused by the inability to drain the residual ballast water in the bilge during the tilting test. BRIEF DESCRIPTION OF THE DRAWINGS

[0073] Figure 1 Schematic diagram of the measurement of blade weight and longitudinal center of gravity position of floating offshore wind turbines.

[0074] Figure 2 Schematic diagram of the measurement of the vertical center of gravity position of blades of floating offshore wind turbines. DETAILED DESCRIPTION

[0075] The present invention will be further described below in conjunction with specific embodiments.

[0076] Example 1

[0077] The method for determining the weight center of gravity of a floating offshore wind turbine provided in this embodiment includes the following steps:

[0078] S1. Obtain and count the weight and center of gravity information of the simulation modeling structure of each subsystem of the floating offshore wind turbine, wherein the subsystem includes the impeller assembly, the main engine assembly, the tower assembly, the foundation buoy assembly and the turret structure. Use 3D modeling software to calculate the physical properties such as the dimensions, volume and density of each component of the floating offshore wind turbine to obtain the weight and center of gravity information of each component, perform refined modeling, and the modeling degree is accurate to bolts and gaskets, and count the weight and center of gravity data of each subsystem modeling component respectively;

[0079] At the same time, the on-site crane is used to weigh each subsystem of the floating offshore wind turbine and measure the longitudinal and vertical center of gravity positions of each subsystem, and the weight center of gravity calculated value of each subsystem is calculated. The measured weight center of gravity value is checked with the weight center of gravity calculated value to obtain the measured weight center of gravity value, including the following steps:

[0080] Use a crane on site to weigh each subsystem of the floating offshore wind turbine and measure the longitudinal and vertical center of gravity positions of each subsystem, and calculate the weight center of gravity value of each subsystem. Verify the measured weight center of gravity value with the weight center of gravity value to obtain the measured weight center of gravity value, including the following steps:

[0081] S1.1. Set two supports and fixtures at the bottom of the subsystem, and hang the two hooks of the crane with weight sensors on the preset lifting ears on the left and right sides of the subsystem respectively. Set the lifting ears on the left and right sides of the subsystem as point A and point B, the center point of one support as point C, and the center point of the other support as point D;

[0082] S1.2. The distance between the lifting eye at point A and the center point of the support at point C is L A , the distance between the lifting eye at point B and the center point of the support at point D is L B , the distance between point C and point D is L, assuming that the distance between the subsystem's center of gravity point G and the center of the support point D is X, and the weight of the subsystem is M;

[0083] Lift the lifting lug at point A vertically, record the crane weighing reading, and subtract the weight of the tooling to get m. A ;

[0084] Lift the lifting lug at point B vertically, record the crane weighing reading, and subtract the weight of the tooling to get m. B ;

[0085] According to the moment balance principle, the following formula is obtained:

[0086] m A L A =M(LX) (1);

[0087] m B L B =MX (2);

[0088] Adding equation (1) and equation (2) gives m A L A +m B L B =ML;

[0089] The weight of the subsystem is obtained as:

[0090] According to formula (2), the longitudinal position of the center of gravity is:

[0091] S1.3. Measure the distance h from the center point of the lifting eyelet at point B to the bottom surface of the subsystem 1 ; Lift the lifting lug at point B vertically, and measure the lifting height as h 2 , record the crane weighing reading, minus the tooling weight, which is m B , at this time the angle between the subsystem and the ground is θ, then:

[0092]

[0093] According to the state after lifting, the moment balance principle is applied to obtain the following formula:

[0094] m B (L B -h 1 tanθ)cosθ=M(XZ G tanθ)cosθ (4);

[0095] The vertical position of the subsystem center of gravity is obtained as:

[0096] S1.4. Check the measured weight center of gravity value with the weight, vertical and longitudinal calculated values ​​of the center of gravity to obtain the actual measured weight center of gravity value.

[0097] S2. At the installation dock of the floating offshore wind turbine, during the hoisting process of the floating offshore wind turbine, the draft depth of the floating offshore wind turbine at each installation stage was measured using the water gauge provided by the floating offshore wind turbine. At the same time, the seawater density at the site was measured to be 0.998kg / m 3 , and obtain the draft depth change and weight center position of each installation stage of the floating offshore wind turbine; the installation stages of the floating offshore wind turbine sequentially include the foundation launching stage, the buoy hoisting stage, the tower crane unhooking stage, the main engine hoisting stage and the impeller hoisting stage.

[0098] S3. Compare and fit the draft change and weight center of gravity position of the floating offshore wind turbine in each installation stage with the theoretical weight center of gravity calculation value to adjust the weight center of gravity information of the simulation modeling, so as to control the weight center of gravity of each subsystem of the floating offshore wind turbine in the construction process. The installation stages of the floating offshore wind turbine include the foundation launching stage, the buoy hoisting stage, the tower crane unhooking stage, the main engine hoisting stage and the impeller hoisting stage in sequence.

[0099] The center of gravity position information of each installation stage is statistically analyzed. The actual vertical height of the center of gravity in the foundation launching stage is based on the center of gravity value calculated by simulation. The superposition calculation result is compared with the simulation modeling of the same period. The center of gravity height of each subsequent installation stage is calculated by the weight center of gravity superposition method. The calculation formula is as follows:

[0100]

[0101] Where, H is the height of the center of gravity of the unit simulation in the next stage; H 1 The simulated center of gravity height of the unit before hoisting; m 1 H is the simulated weight of the unit before hoisting; 2 Simulated center of gravity height of the hoisted component; m 2 Simulate the weight of the hoisted components.

[0102] Example 2

[0103] The system for determining the weight center of gravity of a floating offshore wind turbine provided in this embodiment is used to implement the method for determining the weight center of gravity of a floating offshore wind turbine described in Example 1, including:

[0104] A simulation weight center of gravity acquisition module is used to acquire and count the weight center of gravity information of the simulation modeling of each subsystem of the floating offshore wind turbine;

[0105] The measured weight center of gravity acquisition module is used to measure and calculate the weight of each subsystem of the floating offshore wind turbine and the longitudinal and vertical center of gravity position of each subsystem, and to verify the measured value with the calculated value to obtain the calculated value of the measured weight center of gravity, including:

[0106] Use the on-site crane to weigh each subsystem of the floating offshore wind turbine and measure the longitudinal and vertical center of gravity positions of each subsystem to obtain the calculated value of the measured weight center of gravity, including the following steps:

[0107] a. Set two supports and fixtures at the bottom of the subsystem, and hang the two hooks of the crane with weight sensors on the preset lifting ears on the left and right sides of the subsystem respectively. Set the lifting ears on the left and right sides of the subsystem as point A and point B, the center point of one support as point C, and the center point of the other support as point D;

[0108] b. The distance between the lifting eye at point A and the center point of the support at point C is L A , the distance between the lifting eye at point B and the center point of the support at point D is L B , the distance between point C and point D is L, assuming that the distance between the subsystem's center of gravity point G and the center of the support point D is X, and the weight of the subsystem is M;

[0109] Lift the lifting lug at point A vertically, record the crane weighing reading, and subtract the weight of the tooling to get m. A ;

[0110] Lift the lifting lug at point B vertically, record the crane weighing reading, and subtract the weight of the tooling to get m. B ;

[0111] According to the principle of torque balance, the following formula is obtained:

[0112] m A L A =M(LX) (6);

[0113] m B L B =MX (7);

[0114] Adding equation (6) and equation (7) gives m A L A +m B L B=ML;

[0115] The weight of the subsystem is obtained as:

[0116] According to formula (7), the longitudinal position of the center of gravity is:

[0117] c. Measure the distance h from the center point of the eyelet at point B to the bottom surface of the subsystem 1 ; Lift the lifting lug at point B vertically, and measure the lifting height as h 2 , record the crane weighing reading, minus the tooling weight, which is m B , at this time the angle between the subsystem and the ground is θ, then:

[0118]

[0119] According to the state after lifting, the moment balance principle is applied to obtain the following formula:

[0120] m B (L B -h 1 tanθ)cosθ=M(XZ G tanθ)cosθ (9);

[0121] The vertical position of the subsystem center of gravity is obtained as:

[0122] d. Check the measured weight center of gravity value with the weight, center of gravity vertical and longitudinal calculated values ​​to obtain the actual measured weight center of gravity value.

[0123] The weight center of gravity measurement acquisition module is used to obtain the actual draft depth change and weight center of gravity position of the floating body of the floating offshore wind turbine at each installation stage; at the installation dock of the floating offshore wind turbine, during the hoisting process of the floating offshore wind turbine, the draft depth of the floating offshore wind turbine at each installation stage is measured and read using the water gauge provided by the floating offshore wind turbine, and the seawater density on site is measured at the same time to obtain the draft depth change and weight center of gravity position of the floating offshore wind turbine at each installation stage.

[0124] The simulation model optimization module fits the theoretical weight center of gravity calculation value according to the draft depth changes and weight center of gravity position of the floating body at each stage, and further optimizes the simulation modeling of each subsystem of the floating offshore wind turbine;

[0125] The weight center of gravity superposition calculation module is used to superimpose the actual weight center of gravity of the floating offshore wind turbine at each installation stage and compare the superposition calculation results with the simulation modeling of the same period, including:

[0126] The draft change and weight center of gravity position of the floating offshore wind turbine in each installation stage are compared and fitted with the theoretical weight center of gravity calculation value to adjust the weight center of gravity information of the simulation modeling, so as to control the weight center of gravity of each subsystem of the floating offshore wind turbine in the construction process. The installation stages of the floating offshore wind turbine include the foundation launching stage, the buoy hoisting stage, the tower crane unhooking stage, the main engine hoisting stage and the impeller hoisting stage in sequence;

[0127] The center of gravity position information of each installation stage is statistically analyzed. The actual vertical height of the center of gravity in the foundation launching stage is based on the center of gravity value calculated by simulation. The superposition calculation result is compared with the simulation modeling of the same period. The center of gravity height of each subsequent installation stage is calculated by the weight center of gravity superposition method. The calculation formula is as follows:

[0128]

[0129] Where, H is the height of the center of gravity of the unit simulation in the next stage; H 1 The simulated center of gravity height of the unit before hoisting; m 1 H is the simulated weight of the unit before hoisting; 2 Simulated center of gravity height of the hoisted component; m 2 Simulate the weight of the hoisted components.

[0130] The embodiments described above are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, all changes made according to the shape and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for determining the weight center of gravity of a floating offshore wind turbine, characterized in that: The method is to obtain and count the weight center of gravity information of the simulation modeling of each subsystem of the floating offshore wind turbine, measure the weight of each subsystem of the floating offshore wind turbine and the longitudinal and vertical center of gravity position of each subsystem, and calculate the theoretical weight center of gravity calculated value of each subsystem at the same time, and check the measured weight center of gravity value with the theoretical weight center of gravity calculated value to obtain the measured weight center of gravity value; then measure the draft depth change and weight center of gravity position of the floating body of the floating offshore wind turbine at each installation stage; according to the draft depth change and weight center of gravity position of the floating body at each installation stage, the theoretical weight center of gravity calculated value is fitted, and the simulation modeling of each subsystem of the floating offshore wind turbine is further optimized, and the actual weight center of gravity of each installation stage of the floating offshore wind turbine is superimposed, and the superimposed calculation results are compared with the simulation modeling of the same period, and finally the weight center of gravity measurement of the floating offshore wind turbine is completed.

2. A method for determining the weight center of gravity of a floating offshore wind turbine according to claim 1, characterized in that: The following steps are involved: S1. Obtain and count the weight center of gravity information of the simulation modeling structure of each subsystem of the floating offshore wind turbine, use three-dimensional modeling software to calculate the physical properties of each component of the floating offshore wind turbine to obtain the weight center of gravity information of each component, perform refined modeling, and the modeling degree is accurate to bolts and gaskets, and count the weight center of gravity data of each subsystem modeling component respectively; at the same time, use the on-site crane to weigh each subsystem of the floating offshore wind turbine and measure the longitudinal and vertical center of gravity position of each subsystem, and calculate the weight center of gravity calculated value of each subsystem at the same time, and check the measured weight center of gravity value with the weight center of gravity calculated value to obtain the measured weight center of gravity value; S2. At the installation dock of the floating offshore wind turbine, during the hoisting process of the floating offshore wind turbine, use the water gauge of the floating offshore wind turbine to measure the draft of the floating offshore wind turbine at each installation stage, and measure the seawater density at the site to obtain the draft change and weight center position of the floating offshore wind turbine at each installation stage; S3. Compare and fit the draft changes and weight center of gravity positions of floating offshore wind turbines at various installation stages with the theoretical weight center of gravity calculation values ​​to adjust the weight center of gravity information of the simulation modeling, thereby controlling the weight center of gravity of each subsystem of the floating offshore wind turbine during the construction process. Collect statistics on the center of gravity position information of each installation stage of the floating body, and use the weight center of gravity superposition method to simulate and calculate the center of gravity height of each stage. Compare the superposition calculation results with the simulation modeling of the same period, and finally obtain the weight and center of gravity results of the floating wind turbine.

3. A method for determining the weight center of gravity of a floating offshore wind turbine according to claim 2, characterized in that: The step S1 comprises: The subsystem includes an impeller assembly, a main engine assembly, a tower assembly, a basic buoy assembly and a turret structure.

4. A method for determining the weight center of gravity of a floating offshore wind turbine according to claim 2, characterized in that: The step S1 comprises: Use a crane on site to weigh each subsystem of the floating offshore wind turbine and measure the longitudinal and vertical center of gravity positions of each subsystem, and calculate the weight center of gravity value of each subsystem. Verify the measured weight center of gravity value with the weight center of gravity value to obtain the measured weight center of gravity value, including the following steps: S1.

1. Set two supports and fixtures at the bottom of the subsystem, and hang the two hooks of the crane with weight sensors on the preset lifting ears on the left and right sides of the subsystem respectively. Set the lifting ears on the left and right sides of the subsystem as point A and point B, the center point of one support as point C, and the center point of the other support as point D; S1.

2. The distance between the lifting eye at point A and the center point of the support at point C is L A , the distance between the lifting eye at point B and the center point of the support at point D is L B , the distance between point C and point D is L, assuming that the distance between the subsystem's center of gravity point G and the center of the support point D is X, and the weight of the subsystem is M; Lift the lifting lug at point A vertically, record the crane weighing reading, and subtract the weight of the tooling to get m. A ; Lift the lifting lug at point B vertically, record the crane weighing reading, and subtract the weight of the tooling to get m. B ; According to the principle of torque balance, the following formula is obtained: m A L A =M(L-X) (1); m B L B =MX (2); Adding equation (1) and equation (2) gives m A L A +m B L B =ML; The weight of the subsystem is obtained as: According to formula (2), the longitudinal position of the center of gravity is: S1.

3. Measure the distance h1 from the center point of the lifting eye at point B to the bottom of the subsystem; vertically lift the lifting eye at point B and measure the lifting height as h2. Record the crane weighing reading and subtract the weight of the tooling to get the value in m. B , at this time the angle between the subsystem and the ground is θ, then: According to the state after lifting, the moment balance principle is applied to obtain the following formula: m B (L B -h1tanθ)cosθ=M(X-Z G tanθ)cosθ (4); The vertical position of the subsystem center of gravity is obtained as: S1.

4. Check the measured weight center of gravity value with the weight, vertical and longitudinal calculated values ​​of the center of gravity to obtain the actual measured weight center of gravity value.

5. A method for determining the weight center of gravity of a floating offshore wind turbine according to claim 2, characterized in that: The step S2 comprises: The installation stages of the floating offshore wind turbine generator system sequentially include a foundation launching stage, a buoy hoisting stage, a tower crane unhooking stage, a main engine hoisting stage, and a rotor hoisting stage.

6. A method for determining the weight center of gravity of a floating offshore wind turbine according to claim 2, characterized in that: The step S3 comprises: The draft change and weight center of gravity position of the floating offshore wind turbine in each installation stage are compared and fitted with the theoretical weight center of gravity calculation value to adjust the weight center of gravity information of the simulation modeling, so as to control the weight center of gravity of each subsystem of the floating offshore wind turbine in the construction process. The installation stages of the floating offshore wind turbine include the foundation launching stage, the buoy hoisting stage, the tower crane unhooking stage, the main engine hoisting stage and the impeller hoisting stage in sequence; The center of gravity position information of each installation stage is statistically analyzed. The actual vertical height of the center of gravity in the foundation launching stage is based on the center of gravity value calculated by simulation. The superposition calculation result is compared with the simulation modeling of the same period. The center of gravity height of each subsequent installation stage is calculated by the weight center of gravity superposition method. The calculation formula is as follows: Wherein, H is the simulated center of gravity height of the unit in the next stage; H1 is the simulated center of gravity height of the unit before hoisting; m1 is the simulated weight of the unit before hoisting; H2 is the simulated center of gravity height of the hoisted components; m2 is the simulated weight of the hoisted components.

7. A system for measuring the weight center of gravity of a floating offshore wind turbine, characterized in that: The method for determining the weight center of gravity of a floating offshore wind turbine generator system according to any one of claims 1 to 6 comprises: A simulation weight center of gravity acquisition module is used to acquire and count the weight center of gravity information of the simulation modeling of each subsystem of the floating offshore wind turbine; The measured weight center of gravity acquisition module is used to measure and calculate the weight of each subsystem of the floating offshore wind turbine and the longitudinal and vertical center of gravity position of each subsystem, and to verify the measured value with the calculated value to obtain the calculated value of the measured weight center of gravity; The weight center of gravity acquisition module is used to obtain the actual draft depth change and weight center of gravity position of the floating body of the floating offshore wind turbine at each installation stage; The simulation model optimization module fits the theoretical weight center of gravity calculation value according to the draft depth changes and weight center of gravity position of the floating body at each stage, and further optimizes the simulation modeling of each subsystem of the floating offshore wind turbine; The weight center of gravity superposition calculation module is used to superimpose the actual weight center of gravity of the floating offshore wind turbine at each installation stage, and compare the superposition calculation results with the simulation modeling of the same period.

8. A system for determining the weight center of gravity of a floating offshore wind turbine according to claim 7, characterized in that: The measured weight center of gravity acquisition module includes: Use the on-site crane to weigh each subsystem of the floating offshore wind turbine and measure the longitudinal and vertical center of gravity positions of each subsystem to obtain the calculated value of the measured weight center of gravity, including the following steps: a. Set two supports and fixtures at the bottom of the subsystem, and hang the two hooks of the crane with weight sensors on the preset lifting ears on the left and right sides of the subsystem respectively. Set the lifting ears on the left and right sides of the subsystem as point A and point B, the center point of one support as point C, and the center point of the other support as point D; b. The distance between the lifting eye at point A and the center point of the support at point C is L A , the distance between the lifting eye at point B and the center point of the support at point D is L B , the distance between point C and point D is L, assuming that the distance between the subsystem's center of gravity point G and the center of the support point D is X, and the weight of the subsystem is M; Lift the lifting lug at point A vertically, record the crane weighing reading, and subtract the weight of the tooling to get m. A ; Lift the lifting lug at point B vertically, record the crane weighing reading, and subtract the weight of the tooling to get m. B ; According to the principle of torque balance, the following formula is obtained: m A L A =M(L-X) (6); m B L B =MX (7); Adding equation (6) and equation (7) gives m A L A +m B L B =ML; The weight of the subsystem is obtained as: According to formula (7), the longitudinal position of the center of gravity is: c. Measure the distance h1 from the center point of the lifting eye at point B to the bottom of the subsystem; vertically lift the lifting eye at point B, measure the lifting height as h2, record the crane weighing reading, and subtract the weight of the tooling to get m. B , at this time the angle between the subsystem and the ground is θ, then: According to the state after lifting, the moment balance principle is applied to obtain the following formula: m B (L B -h1tanθ)cosθ=M(X-Z G tanθ)cosθ (9); The vertical position of the subsystem center of gravity is obtained as: d. Check the measured weight center of gravity value with the weight, center of gravity vertical and longitudinal calculated values ​​to obtain the actual measured weight center of gravity value.

9. A system for determining the weight center of gravity of a floating offshore wind turbine according to claim 7, characterized in that: The measurement weight center of gravity acquisition module includes: At the installation dock of the floating offshore wind turbine, during the hoisting process of the floating offshore wind turbine, the draft of the floating offshore wind turbine at each installation stage is measured using the water gauge provided by the floating offshore wind turbine. At the same time, the seawater density at the site is measured to obtain the draft changes and weight center position of the floating offshore wind turbine at each installation stage.

10. A system for determining the weight and center of gravity of a floating offshore wind turbine according to claim 7, characterized in that: The weight center of gravity superposition calculation module includes: The draft change and weight center of gravity position of the floating offshore wind turbine in each installation stage are compared and fitted with the theoretical weight center of gravity calculation value to adjust the weight center of gravity information of the simulation modeling, so as to control the weight center of gravity of each subsystem of the floating offshore wind turbine in the construction process. The installation stages of the floating offshore wind turbine include the foundation launching stage, the buoy hoisting stage, the tower crane unhooking stage, the main engine hoisting stage and the impeller hoisting stage in sequence; The center of gravity position information of each installation stage is statistically analyzed. The actual vertical height of the center of gravity in the foundation launching stage is based on the center of gravity value calculated by simulation. The superposition calculation result is compared with the simulation modeling of the same period. The center of gravity height of each subsequent installation stage is calculated by the weight center of gravity superposition method. The calculation formula is as follows: Wherein, H is the simulated center of gravity height of the unit in the next stage; H1 is the simulated center of gravity height of the unit before hoisting; m1 is the simulated weight of the unit before hoisting; H2 is the simulated center of gravity height of the hoisted components; m2 is the simulated weight of the hoisted components.

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