A method for monitoring water seepage in a floating wind turbine buoy

Abstract

The present invention discloses a method for monitoring water seepage in a floating wind turbine buoy. The method comprises the following steps: n groups of inductive sensors are evenly arranged along the circumferential direction on the inner wall of the buoy, the n groups of inductive sensors are numbered in sequence, one group of inductive sensors corresponds to a fixed resistor in series, the signals of the n groups of inductive sensors are uniformly connected to a controller, and the position of each group of inductive sensors is recorded. The loop current of each group of inductive sensors is monitored in real time by the controller. If the loop current changes, it indicates that water seepage and leakage occur inside the buoy. The controller then determines the leakage position according to the number of the corresponding inductive sensor, calculates the specific leakage position according to the loop current, and issues an alarm. The present invention realizes low-cost and highly reliable real-time monitoring of the sealing of floating wind turbine buoys under special processes and special working environments.

Description

Technical Field

[0001] The invention relates to the technical field of wind turbine buoys, and in particular to a method for monitoring water seepage of a floating wind turbine buoy. Background Art

[0002] With the development of technology, offshore wind turbines have shifted from shallow waters to deep seas. Due to cost factors, deep-sea wind power generation inevitably chooses floating foundations. The floating foundation is an important part of the unit. The sealing condition of the buoy is related to the safety of the entire unit. Therefore, it is very important to effectively monitor the water seepage of the buoy, detect the leakage problem in time and then alarm.

[0003] Due to various factors such as cost, quality, and process, some buoys are made of fiberglass, with foam filling in the middle, and the foams are connected and sealed using glue filling. Since the buoys are in the marine environment and there is a risk of impact cracking, it is necessary to monitor the water seepage effectively. There are three difficulties in monitoring:

[0004] 1) The buoy is immersed in the sea throughout its entire life cycle, and the sensor is almost impossible to replace, so the sensor is required to be reliable and durable.

[0005] 2) All areas where the buoy is immersed in seawater are at risk of leakage and need to be monitored, and the monitoring area is large.

[0006] 3) The foam filled in the middle of the float needs to be connected and sealed by glue injection. When the glue solidifies during the injection, it will release heat, and the temperature can be as high as 150°C. General conventional monitoring sensors cannot meet the requirements. Summary of the invention

[0007] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a method for monitoring water seepage in the buoy of a floating wind turbine set, which can realize low-cost and highly reliable real-time monitoring of the sealing of the floating wind turbine buoy under special processes and special working environments.

[0008] To achieve the above-mentioned purpose, the technical solution provided by the present invention is: a method for monitoring water seepage in a floating wind turbine buoy, which needs to be configured with: a controller, n groups of inductive sensors, n fixed value resistors and insulating parts, each group of inductive sensors includes two exposed wires of the same specification, namely a first exposed wire and a second exposed wire; the method includes:

[0009] n groups of inductive sensors are evenly arranged along the circumference of the inner wall of the buoy, and the two exposed wires of each group of inductive sensors are bent into a V-shaped shape on the inner wall of the buoy to adapt to the shape of the inner wall of the buoy, so that the two exposed wires of each group of inductive sensors are evenly spaced, and the bottoms of all inductive sensors will cross at the bottom of the inner wall of the buoy, and insulating members are used at the intersections to insulate the two inductive sensors from each other;

[0010] The n groups of inductive sensors are numbered in sequence, one group of inductive sensors corresponds to a fixed value resistor connected in series, the head end of the first exposed wire in each group of inductive sensors is connected to the positive pole of the controller through a connecting wire, and the tail end thereof is respectively connected to the negative pole of the corresponding fixed value resistor and the head end of the second exposed wire through two connecting wires, the negative pole of the controller is connected to the positive pole of the fixed value resistor through the connecting wire, the signals of the n groups of inductive sensors are uniformly connected to the controller, and the orientation of each group of inductive sensors is recorded, and the controller is connected to the fan main control through a cable;

[0011] The controller monitors the loop current of each group of inductive sensors in real time. If the loop current changes, it means that water leakage has occurred inside the buoy. The controller then determines the leakage direction based on the number of the corresponding inductive sensor, calculates the specific leakage location based on the loop current, and issues an alarm.

[0012] Furthermore, the loop current of each group of inductive sensors is monitored in real time by the controller. If all loop currents change, it can be determined that the water leakage location is located at the bottom intersection of the inductive sensors, that is, the bottom of the buoy.

[0013] Further, the process of calculating the specific leakage location according to the loop current is as follows:

[0014] According to the formula R A =ρL A / S Calculate the resistance R of the first exposed wire in each group of inductive sensors A ,

[0015] Where ρ represents the resistivity of the bare wire, L A represents the length of the first exposed wire, and S represents the cross-sectional area of ​​the exposed wire;

[0016] When there is no water leakage in the buoy, the R 线 +R 定 +R 器 Calibrate, R 线 is the total resistance of the connecting wires in the loop of the inductive sensor, R 定 is a fixed value resistor, R 器 The controller collects the loop current of n groups of inductive sensors through the controller. According to the formula of each loop resistance R when there is no leakage, 未泄 =R A +R 线 +R 定 +R 器 Get the current in each loop R 线 +R 定 +R 器 The value of

[0017] When water seepage and leakage occurs in the buoy, the controller obtains the corresponding sensor number according to the changing loop current I, and then determines the direction of the water seepage and leakage. Then, according to the formula R 泄 =U / I to get the corresponding loop resistance R 泄 , where U is the controller output power supply voltage, and I is the loop current collected in real time;

[0018] According to the leakage induction sensor loop resistance formula R 泄 =2R x +R 海水 +R 线 +R 定 +R 器 Calculate the resistance R from the first exposed wire end to the short circuit point x , where R 海水 is the short-circuit resistance of seawater;

[0019] Finally, according to the formula R x =ρL 短路 / S Calculate the distance L between the leakage location and the first exposed wire end 短路 , and then determine the specific location of the water seepage leakage.

[0020] Furthermore, the exposed wire is a copper wire, an aluminum wire or a stainless steel wire.

[0021] Furthermore, the insulating member is insulating foam or insulating plastic.

[0022] Furthermore, the controller is installed at the top inlet of the buoy.

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

[0024] 1. Economy and reliability: The induction sensor used in the monitoring method of the present invention is a laid bare wire made of conductive materials such as copper, aluminum or stainless steel, which is low in cost, strong and durable, long in service life and high in accuracy.

[0025] 2. Flexibility: The inductive sensor used in the monitoring method of the present invention is a laid bare wire, and the length and laying density of the wire can be freely selected according to the shape of the test object, which is free and flexible.

[0026] 3. Applicability: In the monitoring method of the present invention, all the places where bare wires are laid are test areas, and the test range is large, which can well meet the special working environment at sea. Compared with conventional monitoring sensors, it is not afraid of heat caused by glue filling, and the installation and operation are simple and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 Schematic diagram of a floating wind turbine.

[0028] Figure 2 The figure is a schematic diagram of water seepage and leakage monitoring using the method of the present invention.

[0029] Figure 3 It is a schematic diagram of the installation of the insulating member in the method of the present invention.

[0030] Figure 4 The figure is a connection diagram of a controller, an inductive sensor and a fixed value resistor in the method of the present invention. DETAILED DESCRIPTION

[0031] The present invention is further described below in conjunction with specific embodiments, but the use of the present invention is not limited thereto.

[0032] like Figure 1 As shown, it is a schematic diagram of a floating wind turbine. The buoy 6 is shuttle-shaped, the tower 7 is in the middle of the buoy 6, and foam 8 is filled between the tower 7 and the buoy 6. When the unit is running, half of the buoy 6 is below the sea level and the other half floats on the sea.

[0033] like Figure 2 As shown, the floating wind turbine buoy water seepage monitoring method described in this embodiment needs to be configured with: a controller 1, multiple groups of inductive sensors 2 (8 groups are used as an example in this embodiment), multiple fixed value resistors 3 (8 are used as an example in this embodiment) and insulating parts 4, each group of inductive sensors 2 includes two first bare wires 201 and second bare wires 202 of the same specification, and the bare wires can be selected from copper wires, aluminum wires or stainless steel wires. In this embodiment, aluminum wires are used as an example, and the total length of the first bare wire 201 and the second bare wire 202 is 24 meters, and the cross-sectional area is 0.00002 square meters; the insulating part 4 can be made of insulating foam or insulating plastic; the method includes:

[0034] The eight groups of inductive sensors 2 are evenly arranged along the circumference of the inner wall of the buoy 6. The two exposed wires of each group of inductive sensors 2 are bent into a V-shaped shape on the inner wall of the buoy 6 to adapt to the shape of the inner wall of the buoy 6, so that the two exposed wires of each group of inductive sensors 2 are kept at a uniform distance of 0.2 meters. The bottoms of all inductive sensors 2 will cross at the bottom of the inner wall of the buoy 6, and the inductive sensors 2 are insulated from each other by an insulating member 4 at the intersection. Figure 3 As shown;

[0035] The controller 1 is installed on the top of the tower 7 and located at the top entrance of the buoy 6. The 8 groups of inductive sensors 2 are numbered in sequence (1, 2, 3, ..., 8). One group of inductive sensors 2 corresponds to a fixed resistor 3 connected in series. The resistance of the fixed resistor 3 is 120 ohms. Figure 4As shown, specifically: the head end of the first exposed wire 201 in each group of inductive sensors 2 is connected to the positive electrode of the controller 1 through the connecting wire 5, and the tail end thereof is respectively connected to the negative electrode of the corresponding fixed resistor 3 and the head end of the second exposed wire 202 through two connecting wires 5, and the negative electrode of the controller 1 is connected to the positive electrode of the fixed resistor 3 through the connecting wire 5, and the signals of the eight groups of inductive sensors 2 are uniformly connected to the controller 1, and the orientation of each group of inductive sensors 2 is recorded, and the controller 1 is connected to the fan main control 10 through the cable 9;

[0036] The controller 1 monitors the loop current of each group of inductive sensors 2 in real time. When water leakage occurs, the first exposed wire 201 and the second exposed wire 202 at the leaking point will be short-circuited due to the conductivity of seawater, causing the loop current to change. It can be determined that water leakage occurs inside the buoy 6, and then the controller 1 determines the leakage direction according to the number of the corresponding inductive sensor 2, calculates the specific leakage position according to the loop current, and outputs the switch quantity to trigger the alarm. After hearing the alarm signal, the maintenance personnel quickly locate the leakage position determined by the controller 1 and then take corresponding treatment measures. In addition, when the water leakage position is located at the bottom of the buoy 6, all loop currents will change at this time, and the controller 1 can quickly determine that the water leakage position is located at the bottom intersection of the inductive sensor 2, that is, the bottom of the buoy 6.

[0037] Specifically, the process of calculating the specific leakage location based on the loop current is as follows:

[0038] The resistivity ρ of the exposed wire is known. The resistivity of the aluminum wire used in this embodiment is 2.83×10 -8 Ω*㎡ / m; length L of the first exposed wire 201 A , in this embodiment, it is 12m; the cross-sectional area S of the exposed wire is 0.00002㎡ in this embodiment; then according to the formula R A =ρL A / S calculates the resistance R of the first exposed wire 201 A =1.698×10 -2 Ω;

[0039] When there is no water leakage in the buoy 6, the R 线 +R 定 +R 器 Calibrate, where R 线 is the total resistance of the connecting wire 5 in the loop of the inductive sensor, R 定 is a fixed value resistor 3, R 器is the internal resistance of controller 1 itself, specifically: the loop currents of 8 groups of inductive sensors are collected through controller 1, and the 8 loop currents are: 0.199956709A, 0.199958375A, 0.199956709A, 0.199955043A, 0.199958375A, 0.199958375A, 0.199956709A, 0.199960041A; it is known that the output power supply voltage U of controller 1 is 24V, and the resistance R of each loop when there is no leakage is calculated based on the measured current and the known voltage 未泄 Then, according to the formula of each loop resistance when there is no leakage, R 未泄 =R A +R 线 +R 定 +R 器 Calculate the current R in each loop 线 +R 定 +R 器 The value of R in the 8 loop currents 线 +R 定 +R 器 The values ​​are 120.009Ω, 120.008Ω, 120.009Ω, 120.010Ω, 120.008Ω, 120.008Ω, 120.009Ω, and 120.007Ω respectively; if water seepage occurs somewhere, assuming that the induction sensor corresponding to the location is No. 2, due to the conductivity of seawater, the first exposed wire 201 and the second exposed wire 202 of the No. 2 induction sensor will be short-circuited. At this time, the loop current of the No. 2 induction sensor collected by the controller 1 will change, so that it can be judged that water seepage occurs inside the buoy 6, and the approximate direction of the water seepage can be determined according to the position of the No. 2 induction sensor.

[0040] Furthermore, it is known that the loop current I of the induction sensor No. 2 collected by the controller 1 is 0.198446626AA, then according to the formula R 泄 =U / I to get the corresponding loop resistance R 泄 =120.93932Ω, then according to the known seawater short-circuit resistance R 海水 =0.92Ω (the conductivity of seawater is generally 3-5Ω / m, and the conductivity of standard seawater is 4.54-4.81Ω / m at 17°C), R of sensor No. 2 线 +R 定 +R 器 =120.008Ω, combined with the leakage sensor loop resistance formula R 泄 =2R x +R 海水 +R 线 +R 定 +R器 The resistance R from the first end of the first exposed wire 201 to the short circuit is calculated. x =5.66×10 -3 Ω;

[0041] Finally, according to the formula R x =ρL 短路 / S calculates the distance L between the leakage position and the first end of the first exposed wire 201 短路 , which is about 4m, the specific location of the water leakage can be determined. Finally, the controller 1 outputs an alarm signal, the number and location distance of the induction sensor 2 are 4m, and the maintenance personnel can quickly find the water leakage location based on the information output by the controller 1.

[0042] The monitoring method of the present invention has the advantages of economy, reliability, flexibility and applicability, and can realize low-cost and highly reliable real-time monitoring of the sealing performance of the floating wind turbine buoy under special processes and special working environments.

[0043] 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 monitoring water seepage in a floating wind turbine buoy, characterized in that: The configuration includes: a controller, n groups of inductive sensors, n fixed value resistors and insulating parts, each group of inductive sensors includes two bare wires of the same specification, namely a first bare wire and a second bare wire; the method includes: n groups of inductive sensors are evenly arranged along the circumference of the inner wall of the buoy, and the two exposed wires of each group of inductive sensors are bent into a V-shaped shape on the inner wall of the buoy to adapt to the shape of the inner wall of the buoy, so that the two exposed wires of each group of inductive sensors are evenly spaced, and the bottoms of all inductive sensors will cross at the bottom of the inner wall of the buoy, and insulating members are used at the intersections to insulate the two inductive sensors from each other; The n groups of inductive sensors are numbered in sequence, one group of inductive sensors corresponds to a fixed value resistor connected in series, the head end of the first exposed wire in each group of inductive sensors is connected to the positive pole of the controller through a connecting wire, and the tail end thereof is respectively connected to the negative pole of the corresponding fixed value resistor and the head end of the second exposed wire through two connecting wires, the negative pole of the controller is connected to the positive pole of the fixed value resistor through the connecting wire, the signals of the n groups of inductive sensors are uniformly connected to the controller, and the orientation of each group of inductive sensors is recorded, and the controller is connected to the fan main control through a cable; The controller monitors the loop current of each group of inductive sensors in real time. If the loop current changes, it means that water leakage has occurred inside the buoy. The controller then determines the leakage direction based on the number of the corresponding inductive sensor, calculates the specific leakage location based on the loop current, and issues an alarm.

2. A method for monitoring water seepage in a floating wind turbine buoy according to claim 1, characterized in that: The controller monitors the loop current of each group of inductive sensors in real time. If all loop currents change, it can be determined that the water leakage location is located at the bottom intersection of the inductive sensors, that is, the bottom of the buoy.

3. A method for monitoring water seepage in a floating wind turbine buoy according to claim 1, characterized in that: The process of calculating the specific leakage position according to the loop current is as follows: According to the formula R A =ρL A / S Calculate the resistance R of the first exposed wire in each group of inductive sensors A , Where ρ represents the resistivity of the bare wire, L A represents the length of the first exposed wire, and S represents the cross-sectional area of ​​the exposed wire; When there is no water leakage in the buoy, the R 线 +R 定 +R 器 Calibrate, R 线 is the total resistance of the connecting wires in the loop of the inductive sensor, R 定 is a fixed value resistor, R 器 The controller collects the loop current of n groups of inductive sensors through the controller. According to the formula of each loop resistance R when there is no leakage, 未泄 =R A +R 线 +R 定 +R 器 Get the current in each loop R 线 +R 定 +R 器 The value of When water seepage and leakage occurs in the buoy, the controller obtains the corresponding sensor number according to the changing loop current I, and then determines the direction of the water seepage and leakage. Then, according to the formula R 泄 =U / I to get the corresponding loop resistance R 泄 , where U is the controller output power supply voltage, and I is the loop current collected in real time; According to the leakage induction sensor loop resistance formula R 泄 =2R x +R 海水 +R 线 +R 定 +R 器 Calculate the resistance R from the first exposed wire end to the short circuit point x , where R 海水 is the short-circuit resistance of seawater; Finally, according to the formula R x =ρL 短路 / S Calculate the distance L between the leakage location and the first exposed wire end 短路 , and then determine the specific location of the water seepage leakage.

4. A method for monitoring water seepage in a floating wind turbine buoy according to claim 1, characterized in that: The exposed wire is a copper wire, an aluminum wire or a stainless steel wire.

5. A method for monitoring water seepage in a floating wind turbine buoy according to claim 1, characterized in that: The insulating member is insulating foam or insulating plastic.

6. A method for monitoring water seepage in a floating wind turbine buoy according to claim 1, characterized in that: The controller is installed at the top inlet of the buoy.

Images