Fan lightning protection system detection device and method

Abstract

The invention provides a fan lightning protection system detection device and method.The fan lightning protection system detection device comprises a cantilever detection assembly arranged on a fan tower drum, the height position of the cantilever detection assembly is the position where the front end of a fan blade rotates to be close to the bottom of the fan tower drum, and a conductive assembly is arranged at the front end of the cantilever detection assembly; and the conductive assembly is used for contacting a metal piece at the front end of the fan blade and is connected with the detection unit, and the conduction state of the lightning protection system is detected through the detection unit. According to the device, the conductive assembly is in contact with the metal piece, and the conduction state between the conductive assembly and the metal piece is detected through the detection unit, so that the conduction state of the fan lightning protection system is judged. And a soft magnet contact mode is adopted, so that fan blades are prevented from being abraded. According to the method, automatic detection of the lightning protection system is realized, shutdown detection of the fan is not needed, detection personnel do not need to climb on the fan tower tube to carry out high-altitude operation, the workload and risk of the detection personnel are reduced, and the continuous reliability of the lightning protection system is further ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power generation, and in particular to a detection device and method for a lightning protection system of a wind turbine. Background Art

[0002] Wind turbines are the core equipment of wind power generation, and their safe and stable operation is crucial. Wind turbines are usually installed in open areas at a high height, generally between 80 meters and 280 meters, and are easily hit by lightning. Lightning strikes can cause partial failures in the mechanical system or electrical system of the wind turbine. In severe cases, it can cause serious accidents such as blade explosion and fire, and lead to a long downtime, resulting in a large loss of power generation. Even in severe cases, it can cause fires, resulting in huge economic losses and safety hazards. Therefore, lightning protection measures are particularly important. The main function of the lightning protection line is to safely guide the lightning current into the ground to prevent equipment damage and casualties. Regularly testing the integrity and performance of the lightning protection line is the key to ensuring its effectiveness. The detection content includes the continuity of the line, that is, checking whether the line is complete, whether there is a circuit break or poor contact; detecting resistance parameters, that is, measuring the on-resistance or grounding resistance of the line to ensure that it meets the standard requirements and can effectively guide the lightning current into the ground. Continuity detection is the basis of resistance detection. Only by ensuring a good connection can effective resistance measurement be performed. Abnormalities in these parameters may cause the lightning protection system to fail, thereby increasing the risk of equipment damage.

[0003] At present, the detection of lightning protection lines mainly relies on manual detection, which requires inspectors to carry detection equipment to climb up to the wind turbine at high altitude or in bad weather conditions to check the continuity and resistance parameters of the line point by point, which poses a very high safety risk. In addition, the frequency and coverage of manual detection may be limited, making it impossible to achieve comprehensive and timely monitoring. Chinese patent CN206920541U discloses a wind turbine lightning protection system detection device, including a wind blade and a grounding grid. An internal cavity is provided in the wind blade, and a blade lightning receptor is provided at the top of the wind blade. The blade lightning receptor is a long rod-shaped metal rod. The top of the blade lightning receptor passes through the top surface of the wind blade. The tail end of the blade lightning receptor is provided in the internal cavity of the wind blade and is connected to the grounding grid through a wire. One end of the blade lightning receptor located in the internal cavity is connected to a detection connection cable, which is connected to the output end of a high-voltage generator, and the input end of the high-voltage generator is connected to a high-voltage input cable. The connection point between the wire and the grounding grid is connected to the high-voltage input cable, and the middle section of the detection connection cable is connected to a circuit breaker. The part of the wire located in the internal cavity and the part of the blade lightning receptor located in the internal cavity are respectively sleeved with a plurality of electromagnetic coils, which are connected to a current detection circuit, and an electromagnetic isolation sheet is provided between two adjacent electromagnetic coils. However, this patent requires the installation of multiple components inside the wind blade, which is difficult to install and maintain. Summary of the invention

[0004] The main purpose of the present invention is to provide a wind turbine lightning protection system detection device and method to solve the problem that when performing on-off detection and resistance detection on the wind turbine lightning protection system, it is necessary to manually carry equipment and climb up the wind turbine to perform high-altitude detection operations, and the detection process is cumbersome and there are safety risks.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a wind turbine lightning protection system detection device, including a cantilever detection component arranged on the wind turbine tower, the height position of the cantilever detection component rotates from the front end of the wind turbine blade to a position close to the bottom of the wind turbine tower, and a conductive component is provided at the front end of the cantilever detection component, which is used to contact the metal part at the front end of the wind turbine blade. The conductive component is connected to the detection unit, and the conduction state of the lightning protection system is detected through the detection unit.

[0006] In a preferred embodiment, the conductive component is a flexible soft magnetic body; or the conductive component includes a plurality of filamentary soft magnetic bodies; One end of the conductive component is connected to the front end of the cantilever detection component, and the other end is close to the bottom of the metal part, so as to increase the contact area with the metal part.

[0007] In a preferred embodiment, the cantilever detection component is a movable structure that rotates, telescopes or swings, and is used to adjust the position of the conductive component and control the conductive component to contact or separate from the metal part at the front end of the fan blade.

[0008] In a preferred embodiment, the cantilever detection assembly includes a base fixed on the wind turbine tower, the base is provided with a support arm connected to the conductive assembly, and a movable arm is hingedly provided below the support arm for controlling the movement of the support arm around the hinge point.

[0009] In a preferred embodiment, an air outlet structure is provided below the cantilever detection component, and the air outlet of the air outlet structure faces the conductive component, so as to blow the conductive component toward the front end of the fan blade so that the conductive component contacts the metal part.

[0010] In the preferred embodiment, the detection unit includes an on-off detection unit for detecting the on-off state of the lightning protection system; and a resistance detection unit for detecting the resistance parameters of the lightning protection system; the on-off detection unit and the resistance detection unit are respectively connected to a data processing unit for processing and analyzing the on-off state and resistance parameters.

[0011] In a preferred embodiment, the detection unit further includes a wireless communication unit for connecting to the data processing unit and sending the detection results obtained by the data processing unit to the remote monitoring system.

[0012] A method for using the wind turbine lightning protection system detection device, the method comprising: S1. When the fan blade rotates close to the cantilever detection component, the cantilever detection component is in an unfolded state, and the conductive component is controlled to move below the front end of the fan blade; S2, the conductive component contacts the metal part, the detection unit is started, and the conduction state of the wind turbine lightning protection system is detected; S3. After the detection is completed, the fan blades continue to rotate away from the cantilever detection assembly, the cantilever detection assembly is in a retracted state, and the conductive assembly is controlled to separate from the metal part, so that the fan blades can perform lightning protection system detection during the rotation movement.

[0013] In the preferred embodiment, in step S2, the conduction state detection includes on-off state detection and resistance parameter detection. The on-off state detection uses the measurement of current or voltage to detect the conductive path state of the lightning protection system; the resistance parameter detection measures the on-resistance parameter of the lightning protection system by measuring the current flowing through a known voltage.

[0014] In the preferred embodiment, in step S2, the following steps are also included: S21, the conductive component contacts the metal part at the front end of the fan blade, triggering the switch of the start detection unit to close, and the conductive state detection is performed by integrating the conductive contact in the conductive component and the metal part to form a closed circuit; S22, judging the conductive path of the lightning protection system through the on-off detection unit, if the circuit is continuously unobstructed, the on-off is normal, if there is an open circuit or short circuit, the on-off is abnormal; measuring the on-resistance of the lightning protection system through the resistance detection unit, if the resistance parameter exceeds the preset range, the resistance parameter is abnormal; S23. Use the data processing unit to process and analyze to obtain the detection result of the conduction state. If the detection result is that the conduction is normal and the resistance parameter is within the preset range, the wind turbine lightning protection system is normal; if the detection result is that the conduction is abnormal or the resistance parameter exceeds the preset range, the wind turbine lightning protection system fails.

[0015] The present invention provides a wind turbine lightning protection system detection device and method. The device includes a cantilever detection component arranged on a wind turbine tower. The height position of the cantilever detection component rotates from the front end of the wind turbine blade to a position close to the bottom of the wind turbine tower. The front end of the cantilever detection component is provided with a conductive component, which is used to contact the metal part at the front end of the wind turbine blade. The conductive component is connected to a detection unit, and the conduction state of the lightning protection system is detected by the detection unit. When the wind turbine blade rotates, the front end of the wind turbine blade is close to the cantilever detection component on the wind turbine tower. The conductive component at the front end of the cantilever detection component contacts the metal part at the front end of the wind turbine blade. The conduction state between the conductive component and the metal part is detected by the detection unit connected to the lightning protection system, that is, the conductive component contacts the metal part to form a closed circuit, thereby judging the conduction state of the wind turbine lightning protection system. The method realizes the automatic detection of the wind turbine lightning protection system, does not require the wind turbine to be shut down for maintenance and detection, and does not require the detection personnel to climb up the wind turbine tower for high-altitude detection operations, which can reduce the workload and risks of the detection personnel. The rotation of the fan blades can also be used to perform periodic automatic detection to ensure the continued reliability of the lightning protection system. The soft magnetic contact method can avoid mechanical contact and wear on the fan blades, thus extending the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below in conjunction with the accompanying drawings and embodiments: Figure 1 It is a front view of the wind turbine lightning protection system detection device of the present invention; Figure 2 It is a side view of the wind turbine lightning protection system detection device of the present invention; Figure 3 Schematic diagram of Embodiment 2 of the wind turbine lightning protection system detection device of the present invention; Figure 4 It is a method flow chart of the wind turbine lightning protection system detection device of the present invention; Figure 5 It is a circuit diagram of a detection unit of a wind turbine lightning protection system detection device of the present invention; Figure 6 It is a schematic diagram of the detection unit flow of the wind turbine lightning protection system detection device of the present invention; In the figure: a wind turbine blade 1; a wind turbine tower 2; a cantilever detection component 3; a base 301; a support arm 302; a movable arm 303; a conductive component 4; a metal part 5; and an air outlet structure 6. DETAILED DESCRIPTION

[0017] Embodiment 1: like Figures 1 to 6As shown, a wind turbine lightning protection system detection device includes a cantilever detection component 3 arranged on a wind turbine tower 2, the height position of the cantilever detection component 3 is rotated to a position close to the bottom of the wind turbine tower 2 at the front end of the wind turbine blade 1, and a conductive component 4 is provided at the front end of the cantilever detection component 3, and the conductive component 4 is used to contact the metal part 5 at the front end of the wind turbine blade 1. The conductive component 4 is connected to a detection unit, and the conduction state of the lightning protection system is detected by the detection unit. With this structure, when the wind turbine blade 1 rotates, the front end of the wind turbine blade 1 is close to the cantilever detection component 3 on the wind turbine tower 2, and the conductive component 4 at the front end of the cantilever detection component 3 is used to contact the metal part 5 at the front end of the wind turbine blade 1. The conductive state between the conductive component 4 and the metal part 5 is detected by the detection unit connected to the lightning protection system, that is, the conductive component 4 and the metal part 5 are in contact to form a closed circuit, thereby judging the conduction state of the wind turbine lightning protection system. The device can detect the conduction status of the lightning protection system of the wind turbine tower 2 in real time during the operation of the wind turbine. There is no need to shut down the wind turbine for maintenance, nor is there a need for detection personnel to climb up the wind turbine tower 2 for high-altitude detection operations, which can reduce the workload and risks of detection personnel.

[0018] In the preferred embodiment, Figure 2 and 3 As shown, the conductive component 4 is a flexible soft magnet; or the conductive component 4 includes a plurality of filamentary soft magnets; one end of the conductive component 4 is connected to the front end of the cantilever detection component 3, and the other end is close to the bottom of the metal part 5, which is used to increase the contact area with the metal part 5. With this structure, the conductive component 4 is a soft structure to avoid the conductive component 4 from causing damage to the fan blade 1 during the detection process; a plurality of filamentary soft magnets can flexibly adapt to the shape of the fan blade 1, increase the contact area with the metal part 5, and avoid the loss of magnetic force of some soft magnets, resulting in inaccurate detection results. Preferably, the soft magnet is a flexible magnetic strip or magnetic fiber.

[0019] In the preferred embodiment, Figure 2 and 3 As shown, the cantilever detection component 3 is a movable structure that rotates, telescopes or swings, and is used to adjust the position of the conductive component 4, and control the conductive component 4 to contact or separate from the metal component 5 at the front end of the fan blade 1. With this structure, when the fan blade 1 rotates and the front end of the fan blade 1 is close to the bottom of the fan tower 2, the cantilever detection component 3 automatically adjusts its position so that the front end of the cantilever detection component 3 is close to the front end of the fan blade 1, thereby controlling the conductive component 4 to contact the metal component 5; when the fan blade 1 continues to rotate and the front end of the fan blade 1 is away from the bottom of the fan tower 2, the cantilever detection component 3 automatically adjusts its position so that the front end of the cantilever detection component 3 is away from the front end of the fan blade 1, thereby controlling the conductive component 4 to separate from the metal component 5.

[0020] In the preferred embodiment, as shown in FIG. 2 , the cantilever detection assembly 3 includes a base 301 fixed on the wind turbine tower 2, a support arm 302 connected to the conductive assembly 4 is provided on the base 301, and a movable arm 303 is hingedly provided below the support arm 302 for controlling the support arm 302 to move around the hinge point. With this structure, when the front end of the wind turbine blade 1 is away from the wind turbine tower 2, the cantilever detection assembly 3 is in a retracted state, the movable arm 303 is in a horizontal position, and the support arm 302 is controlled to be arranged parallel to the wind turbine tower 2; when the front end of the wind turbine blade 1 is close to the wind turbine tower 2, the cantilever detection assembly 3 is in an unfolded state, and the movable arm 303 is controlled to be lifted upward, so that the support arm 302 rotates around the hinge point to form an angle with the wind turbine tower 2.

[0021] In the preferred embodiment, as shown in Figures 5 and 6, the detection unit includes an on-off detection unit for detecting the on-off state of the lightning protection system; and a resistance detection unit for detecting the resistance parameter of the lightning protection system; the on-off detection unit and the resistance detection unit are respectively connected to the data processing unit for processing and analyzing the on-off state and the resistance parameter. With this structure, the on-off detection unit is used to detect the current or voltage change of the lightning protection system to determine the on-off state of the system. When the lightning protection system is powered on, there is current or voltage, and the on-off detection unit detects whether the circuit is connected normally, thereby detecting whether the lightning protection system is in a normal state of the conductive path, and transmitting the detection result to the data processing unit. The resistance detection unit is used to measure the resistance parameter of the lightning protection system. The size of the resistance parameter directly affects the lightning protection effect of the lightning protection system, which is used to evaluate the performance of the lightning protection system, and the measured resistance parameter is transmitted to the data processing unit.

[0022] In the preferred embodiment, as shown in Figures 5 and 6, the detection unit also includes a wireless communication unit for connecting to the data processing unit and sending the detection results obtained by the data processing unit to the remote monitoring system. With this structure, the data processing unit receives the detection results of the on-off detection unit and the resistance detection unit, and determines whether the on-off state and resistance parameters of the lightning protection system are normal. If the detection result is abnormal, the data processing unit will generate an alarm or report and send it to the remote monitoring system to remind the maintenance personnel to perform maintenance.

[0023] Embodiment 2: Further illustrate with reference to Example 1, Figure 3 As shown, in the preferred embodiment, an air outlet structure 6 is provided below the cantilever detection component 3, and the air outlet of the air outlet structure 6 faces the conductive component 4, and is used to blow the conductive component 4 toward the front end of the fan blade 1, so that the conductive component 4 contacts the metal part 5. With this structure, when the front end of the cantilever detection component 3 is close to the front end of the fan blade 1, the air is directed through the air outlet structure 6 to facilitate the positioning and contact of the conductive component 4, thereby improving the accuracy and efficiency of the contact between the conductive component 4 and the metal part 5.

[0024] Embodiment 3: Further illustrate with reference to Examples 1 and 2, Figures 1 to 6 As shown, a method for using the wind turbine lightning protection system detection device, the method comprising: S1. When the fan blade 1 rotates to be close to the cantilever detection component 3, the cantilever detection component 3 is in an unfolded state, and the conductive component 4 is controlled to move to the bottom of the front end of the fan blade 1, close to the metal part 5 at the front end of the fan blade 1; S2, the conductive component 4 contacts the metal part 5, and the detection unit is started to detect the conduction state of the wind turbine lightning protection system; S3. After the detection is completed, the wind turbine blade 1 continues to rotate away from the cantilever detection component 3, and the cantilever detection component 3 is in a retracted state. The conductive component 4 is controlled to separate from the metal component 5, so that the wind turbine blade 1 can perform lightning protection system detection during the rotation movement.

[0025] This method realizes the automatic detection of the wind turbine lightning protection system, reduces manual intervention, and improves the detection efficiency. By utilizing the rotational motion of the wind turbine blade 1, periodic automatic detection can also be performed to ensure the continuous reliability of the lightning protection system. Through the soft contact mode between the conductive component 4 and the metal part 5, the wear of the wind turbine blade 1 caused by mechanical contact is reduced, and the service life of the equipment is extended.

[0026] In the preferred embodiment, in step S2, the conduction state detection includes on-off state detection and resistance parameter detection. The on-off state detection uses the measurement of current or voltage to detect the conductive path state of the lightning protection system; the resistance parameter detection measures the on-resistance parameter of the lightning protection system by measuring the current flowing through a known voltage.

[0027] Embodiment 4: Further illustrate with reference to Example 3, Figures 1 to 6 As shown, in the preferred embodiment, the method of the wind turbine lightning protection system detection device, in step S2, further includes the following steps: S21, the conductive component 4 contacts the metal part 5 at the front end of the fan blade 1, triggering the switch of the start detection unit to close, and the conductive contact integrated in the conductive component 4 forms a closed circuit with the metal part 5 to perform the conduction state detection; S22, judging the conductive path of the lightning protection system through the on-off detection unit, if the circuit is continuously unobstructed, the on-off is normal, if there is an open circuit or short circuit, the on-off is abnormal; The on-resistance of the lightning protection system is measured by the resistance detection unit. If the resistance parameter exceeds the preset range, the resistance parameter is abnormal; S23, using the data processing unit to process and analyze to obtain the detection result of the conduction state. If the detection result is that the conduction is normal and the resistance parameter is within the preset range, the wind turbine lightning protection system is normal; If the detection result is abnormal on-off or the resistance parameter exceeds the preset range, the wind turbine lightning protection system will fail. According to this scheme, preferably, the current or voltage of the conductive path is within ±10% of the rated value, which is normal on-off. If the current or voltage is detected to be zero or close to zero, there is an open circuit in the conductive path; if the current or voltage is detected to be abnormally high, there is a short circuit in the conductive path. The preset range of on-resistance is 0~1Ω. If the on-resistance exceeds 0~1Ω, it will cause excessive voltage drop when the current passes through, affecting the normal operation of the lightning protection system.

[0028] The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limiting the present invention. The protection scope of the present invention shall be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A wind turbine lightning protection system detection device, characterized in that: The invention comprises a cantilever detection assembly (3) arranged on a wind turbine tower (2), wherein the height position of the cantilever detection assembly (3) is rotated from the front end of the wind turbine blade (1) to a position close to the bottom of the wind turbine tower (2), and a conductive assembly (4) is arranged at the front end of the cantilever detection assembly (3), the conductive assembly (4) is used to contact a metal part (5) at the front end of the wind turbine blade (1), and the conductive assembly (4) is connected to a detection unit, and the conductive state of the lightning protection system is detected through the detection unit.

2. A wind turbine lightning protection system detection device according to claim 1, characterized in that: The conductive component (4) is a flexible soft magnetic body; or the conductive component (4) includes a plurality of filamentary soft magnetic bodies; One end of the conductive component (4) is connected to the front end of the cantilever detection component (3), and the other end is close to the bottom of the metal component (5) to increase the contact area with the metal component (5).

3. A wind turbine lightning protection system detection device according to claim 1, characterized in that: The cantilever detection component (3) is a movable structure that can rotate, telescope or swing, and is used to adjust the position of the conductive component (4) and control the conductive component (4) to contact or separate from the metal part (5) at the front end of the fan blade (1).

4. A wind turbine lightning protection system detection device according to claim 3, characterized in that: The cantilever detection component (3) comprises a base (301) fixed on the wind turbine tower (2), a support arm (302) connected to the conductive component (4) being provided on the base (301), and a movable arm (303) being hingedly provided below the support arm (302) for controlling the movement of the support arm (302) around a hinge point.

5. A wind turbine lightning protection system detection device according to claim 1, characterized in that: An air outlet structure (6) is provided below the cantilever detection component (3), and an air outlet of the air outlet structure (6) faces the conductive component (4) and is used to blow the conductive component (4) toward the front end of the fan blade (1) so that the conductive component (4) contacts the metal part (5).

6. A wind turbine lightning protection system detection device according to claim 1, characterized in that: The detection unit includes an on-off detection unit for detecting the on-off state of the lightning protection system; and a resistance detection unit for detecting resistance parameters of the lightning protection system; the on-off detection unit and the resistance detection unit are respectively connected to a data processing unit for processing and analyzing the on-off state and resistance parameters.

7. A wind turbine lightning protection system detection device according to claim 6, characterized in that: The detection unit also includes a wireless communication unit for connecting with the data processing unit to send the detection results obtained by the data processing unit to the remote monitoring system.

8. A method for using the wind turbine lightning protection system detection device according to any one of claims 1 to 7, characterized in that: The method includes: S1. When the fan blade (1) rotates to approach the cantilever detection component (3), the cantilever detection component (3) is in an unfolded state, and the conductive component (4) is controlled to move to below the front end of the fan blade (1); S2, the conductive component (4) contacts the metal component (5), the detection unit is started, and the conduction state of the wind turbine lightning protection system is detected; S3. After the detection is completed, the wind turbine blade (1) continues to rotate away from the cantilever detection component (3), the cantilever detection component (3) is in a retracted state, and the conductive component (4) is controlled to separate from the metal component (5), so that the wind turbine blade (1) can perform lightning protection system detection during the rotational movement.

9. The method of detecting a lightning protection system for a wind turbine according to claim 8 is characterized in that: In step S2, the conduction state detection includes on-off state detection and resistance parameter detection. The on-off state detection uses the measurement of current or voltage to detect the conductive path state of the lightning protection system; the resistance parameter detection measures the on-resistance parameter of the lightning protection system by measuring the current flowing through the known voltage.

10. The method for detecting a lightning protection system of a wind turbine according to claim 9 is characterized in that: Step S2 also includes the following steps: S21, the conductive component (4) contacts the metal part (5) at the front end of the fan blade (1), triggering the switch of the start detection unit to close, and performing conduction state detection by integrating the conductive contact in the conductive component (4) and the metal part (5) to form a closed circuit; S22, judging the conductive path of the lightning protection system through the on-off detection unit, if the circuit is continuously unobstructed, the on-off is normal, if there is an open circuit or short circuit, the on-off is abnormal; measuring the on-resistance of the lightning protection system through the resistance detection unit, if the resistance parameter exceeds the preset range, the resistance parameter is abnormal; S23. Use the data processing unit to process and analyze to obtain the detection result of the conduction state. If the detection result is that the conduction is normal and the resistance parameter is within the preset range, the wind turbine lightning protection system is normal; if the detection result is that the conduction is abnormal or the resistance parameter exceeds the preset range, the wind turbine lightning protection system fails.

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