A wind vibration simulation device and simulation method for cable-supported photovoltaic modules

Abstract

This invention discloses a wind vibration simulation device and method for cable-supported photovoltaic modules. The device includes a cable support section for mounting the photovoltaic module, a side anchor section for fixing the cable support section, a wind vibration simulation section for inducing vibration in the cable support section, and a detection section for detecting the state of the photovoltaic module. The cable support section includes multiple steel cables and cable anchors. The ends of the steel cables are connected to the side anchor sections via cable anchors. The excitation end of the wind vibration simulation section is connected to the steel cables. This invention is applicable to the experimental testing of prototype photovoltaic modules. By stimulating the cable support section, the vibration of the cable-supported photovoltaic structure can be simulated, and the detection section can obtain various state parameters of the photovoltaic module under vibration conditions. By equivalently simulating various working states of the photovoltaic module structure system under actual operating conditions, the reliability of the photovoltaic module structure system can be verified, providing a basis for the optimization of the photovoltaic module structure system and providing scientific support for the widespread application of the photovoltaic module structure system.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic technology, and in particular to a wind vibration simulation device and simulation method for cable-supported photovoltaic modules. Background Technology

[0002] With the continuous application and promotion of flexible cable-supported photovoltaic module structures, problems that need to be solved in this system structure have gradually emerged. Among these, the flexible cable-supported photovoltaic module structure mainly uses cable structures to support the self-weight of the photovoltaic module and various forces, especially wind loads in the natural environment, which are a very important controlling load. In the natural environment, the flexible cable-supported photovoltaic module structure may be affected by different wind forces, resulting in varying degrees of vibration.

[0003] Therefore, in order to ensure the safety and reliability of the flexible cable-supported photovoltaic module structure system within its design service life, the design of a wind vibration simulation device for cable-supported photovoltaic modules under equivalent working conditions has become a problem that needs to be solved. Summary of the Invention

[0004] The purpose of this invention is to provide a wind vibration simulation device and method for cable-supported photovoltaic modules, thereby solving the above-mentioned problems.

[0005] To achieve the above objectives, the present invention first discloses a wind vibration simulation device for cable-supported photovoltaic modules, comprising a cable support portion for installing photovoltaic modules, a side anchor portion for fixing the cable support portion, a wind vibration simulation portion for exciting the vibration of the cable support portion, and a detection portion for detecting the state of the photovoltaic modules. The cable support portion includes multiple steel cables and cable anchors, the ends of the steel cables are connected to the side anchor portions through the cable anchors, and the excitation end of the wind vibration simulation portion is connected to the steel cables.

[0006] Furthermore, the side anchor portion includes side posts, a first side post lug, a second side post lug, and a ground anchor cable disposed at both ends of the cable support portion. The first side post lug and the second side post lug are disposed on both sides of the side post. The ground anchor cable is hinged to the second side post lug, and the first side post lug is hinged to the cable anchor.

[0007] Furthermore, the detection unit includes a cable force gauge for detecting the tension of the steel cable, a displacement gauge for detecting the displacement of the photovoltaic module, an accelerometer for detecting the acceleration of the photovoltaic module, and a microcrack detection device for detecting microcracks in the photovoltaic module, wherein the cable force gauge is installed on the steel cable.

[0008] Furthermore, the displacement meter includes a horizontal laser displacement meter and a vertical laser displacement meter. The horizontal laser displacement meter is installed on either the left or right side of the photovoltaic module, and the vertical laser displacement meter is installed on either the top or bottom side of the photovoltaic module.

[0009] Furthermore, the accelerometers are installed at the four corners of the photovoltaic module.

[0010] Furthermore, the wind vibration simulation unit includes a base, a vibration transmission rod, a steering mechanism, and an exciter. The exciter is mounted on the base, the vibration transmission rod is sleeved on the steel cable, the excitation end of the exciter is equipped with the steering mechanism, and the vibration transmission rod is mounted on the steering mechanism.

[0011] Furthermore, the steering system includes a horizontal vibration steering system, a vertical vibration steering system, and a torsional vibration steering system.

[0012] Furthermore, the cable support also includes a latch for connecting the photovoltaic module, which is detachably locked onto the steel cable.

[0013] Then, this invention discloses a method for simulating wind vibration of cable-supported photovoltaic modules, comprising the following steps:

[0014] S1. Obtain the structural frequency and maximum vibration displacement of the photovoltaic module in a windy environment.

[0015] S2. Convert the frequency and amplitude of the real structure to obtain the appropriate simulated frequency and amplitude.

[0016] S3. Complete the construction of the wind vibration simulation device for cable-supported photovoltaic modules, and measure and adjust the frequency and amplitude of the simulated structure.

[0017] S4. After the simulated wind vibration test is completed, the parameters of the photovoltaic module are sampled and collected, and the module microcrack test and power generation test are performed.

[0018] Furthermore, in step S1, a finite element model of the cable-supported photovoltaic module is established to obtain its structural frequency, and a flutter analysis is performed on it to calculate the maximum vibration displacement that occurs in a windy environment; or the structural frequency and maximum vibration displacement under strong wind are obtained based on the actual field measurement data of the real array.

[0019] Compared with the prior art, the advantages of the present invention are:

[0020] This invention is applicable to the experimental testing of prototype photovoltaic modules. By exciting the cable support section, the vibration of the cable-supported photovoltaic structure can be simulated, and the detection section can obtain various state parameters of the photovoltaic module under vibration conditions. By equivalently simulating various working states of the photovoltaic module structure system under actual working conditions, the reliability of the photovoltaic module structure system can be verified, providing a basis for the optimization of the photovoltaic module structure system and providing scientific support for the widespread application of the photovoltaic module structure system.

[0021] The present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0022] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0023] Figure 1 This is a front view schematic diagram of the wind vibration simulation device for cable-supported photovoltaic modules disclosed in an embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of the horizontal vibration simulation of the cable-supported photovoltaic module wind vibration simulation device disclosed in the embodiments of the present invention;

[0025] Figure 3 This is a schematic diagram of the vertical vibration simulation of the cable-supported photovoltaic module wind vibration simulation device disclosed in the embodiments of the present invention;

[0026] Figure 4 This is a schematic diagram of torsional vibration simulation of the wind vibration simulation device for cable-supported photovoltaic modules disclosed in an embodiment of the present invention;

[0027] Figure 5 This is an isometric schematic diagram of the wind vibration simulation unit during horizontal vibration simulation as disclosed in an embodiment of the present invention;

[0028] Figure 6 This is an isometric schematic diagram of the wind vibration simulation unit during vertical vibration simulation as disclosed in an embodiment of the present invention;

[0029] Figure 7 This is an isometric schematic diagram of the wind vibration simulation unit during torsional vibration simulation disclosed in an embodiment of the present invention.

[0030] Legend:

[0031] 1. Cable support section; 11. Steel cable; 12. Cable anchor; 13. Locking buckle;

[0032] 2. Side anchor; 21. Side post; 22. First side post lug; 23. Second side post lug; 24. Ground anchor cable;

[0033] 3. Wind vibration simulation unit; 31. Vibration exciter; 32. Vibration transmission rod; 33. Steering mechanism; 331. Horizontal vibration steering mechanism; 332. Vertical vibration steering mechanism; 333. Torsional vibration steering mechanism; 34. Base;

[0034] 4. Inspection Department; 41. Cable Force Gauge; 42. Horizontal Laser Displacement Gauge; 43. Accelerometer; 44. Microcrack Detection Equipment; 45. Vertical Laser Displacement Gauge;

[0035] 5. Photovoltaic modules. Detailed Implementation

[0036] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention can be implemented in many different ways as defined and covered by the claims.

[0037] like Figures 1-7 As shown, this invention discloses a wind vibration simulation device for cable-supported photovoltaic modules, including a cable support section 1 for mounting photovoltaic modules 5, a side anchor section 2 for fixing the cable support section 1, a wind vibration simulation section 3 for stimulating vibration of the cable support section 1, and a detection section 4 for detecting the state of the photovoltaic module 5. The main body of the photovoltaic module 5 is a photovoltaic panel. The cable support section 1 also includes a locking buckle 13 for connecting the photovoltaic module 5, and the locking buckle 13 is detachably locked onto a steel cable 11. The cable support section 1 includes multiple steel cables 11 and cable anchors 12. In this application, the steel cables 11 are two parallel lines used to support the photovoltaic module 5 from both ends. The ends of the steel cables 11 are connected to the side anchor section 2 through the cable anchors 12. The excitation end of the wind vibration simulation section 3 is connected to the steel cables 11. Therefore, this device is suitable for testing prototype photovoltaic modules. By stimulating the cable support section 1, the vibration of the cable-supported photovoltaic structure can be simulated, and the detection section 4 can be used to obtain various state parameters of the photovoltaic module 5 under vibration conditions. By simulating various working states of the photovoltaic module structure system under actual operating conditions using equivalent simulations, the reliability of the photovoltaic module structure system is verified, providing a research basis for the optimization of the photovoltaic module structure system and providing scientific support for the promotion and application of the photovoltaic module structure system.

[0038] In this embodiment, in order to install and fix the steel cable 11, the side anchor part 2 includes side posts 21, first side post ears 22, second side post ears 23 and ground anchor cables 24, which are provided at both ends of the cable support part 1. There are four side posts 21, first side post ears 22, second side post ears 23 and ground anchor cables 24. The first side post ears 22 and second side post ears 23 are provided on both sides of the side posts 21. One end of the ground anchor cable 24 is hinged to the second side post ear 23 and the other end is anchored to the ground. In this way, the side posts 21 can be prevented from tilting to one side of the steel cable 11 and the side posts 21 can be kept vertical. The first side post ears 22 are hinged to the cable anchor 12.

[0039] In this embodiment, the detection unit 4 includes a force gauge 41 for detecting the tension of the steel cable 11, a displacement gauge for detecting the displacement of the photovoltaic module 5, an accelerometer 43 for detecting the acceleration of the photovoltaic module 5, and a microcrack detection device 44 for detecting microcracks in the photovoltaic module 5. The force gauge 41 is mounted on the steel cable 11. The displacement gauge includes a horizontal laser displacement gauge 42 and a vertical laser displacement gauge 45. The horizontal laser displacement gauge 42 is mounted on either the left or right side of the photovoltaic module 5, with its laser probe pointing horizontally towards the photovoltaic module 5. The vertical laser displacement gauge 45 is mounted on either the upper or lower side of the photovoltaic module 5. In this embodiment, it is mounted on the upper side, with the laser probe of the vertical laser displacement gauge 45 pointing vertically towards the photovoltaic module 5.

[0040] In this embodiment, accelerometers 43 are installed at the four corners of the photovoltaic module 5, thereby enabling the measurement of the maximum acceleration on the photovoltaic module 5.

[0041] In this embodiment, the wind vibration simulation unit 3 includes a base 34, a vibration transmission rod 32, a diverter 33, and an exciter 31. The exciter 31 is mounted on the base 34, the vibration transmission rod 32 is sleeved on the steel cable 11, and the diverter 33 is installed at the excitation end of the exciter 31. The vibration transmission rod 32 is mounted on the diverter 33. Specifically, the vibration transmission rod 32 is a horizontal bar with connecting holes at both ends, so that it is sleeved on the steel cables 11 on both sides. The steering mechanism 33 includes a horizontal vibration steering mechanism 331, a vertical vibration steering mechanism 332, and a torsional vibration steering mechanism 333. The exciter 31 can be an electric actuator. The horizontal vibration steering mechanism 331 can convert the reciprocating motion of the electric actuator into the horizontal vibration of the transmission rod 32. The vertical vibration steering mechanism 332 can be a connecting component that connects the electric actuator and the transmission rod 32. The torsional vibration steering mechanism 333 can be a hinge seat and a torsion rod. The middle part of the torsion rod is hinged to the hinge seat. The torsion rod is connected to the transmission rod 32. The electric actuator drives one end of the torsion rod, thereby realizing the yaw vibration of the photovoltaic module 5.

[0042] This invention discloses a wind vibration simulation test method for cable-supported photovoltaic modules, using any of the aforementioned cable-supported photovoltaic module wind vibration simulation test devices, comprising the following steps:

[0043] S1. Establish a finite element model of the cable-supported photovoltaic module to obtain its structural frequency, perform flutter analysis on it, and calculate the maximum vibration displacement that occurs in a windy environment; or obtain its structural frequency and maximum vibration displacement under strong wind based on the actual field measurement data of the array. Either method can be selected.

[0044] S2. Based on the theoretical analysis, the frequency and amplitude of the real structure are converted to obtain the appropriate simulated frequency and amplitude.

[0045] S3. Complete the construction of a wind vibration simulation device for cable-supported photovoltaic modules in the laboratory, and measure and adjust the frequency and amplitude of the simulated structure.

[0046] S4. After the simulated wind vibration test is completed, the parameters of the components are sampled and collected, and the components are subjected to microcrack testing (EL test) and power generation testing (IV curve test).

[0047] The theoretical analysis is explained as follows:

[0048] For cable-supported photovoltaic modules, the equation of motion for the structure can be expressed as:

[0049]

[0050] In the formula, Q(t) is a generalized coordinate vector that is a function of time t, and the points on it represent the derivative with respect to time; M, D, and K are the structural mass, damping, and stiffness corresponding to Q(t), respectively, and Q(t) is a generalized force vector.

[0051] This invention simulates the wind-induced vibration of cable-supported photovoltaic modules in a laboratory setting. A prototype structure is used for tensioning the cable supports and installing the photovoltaic modules, ensuring the structural fidelity. The simulation only requires maintaining the same generalized force Q(t).

[0052] For cable-supported photovoltaic modules under wind vibration conditions, the damping term can be ignored, and the stiffness term is not the dominant force in the experiment. Furthermore, in laboratory simulations, the stiffness can be considered approximately the same and is therefore disregarded. In this case, the damping and stiffness terms in the vibration equation are no longer considered; only the mass term of the structure is analyzed. The equation of motion for a cable-supported photovoltaic module can be expressed as:

[0053]

[0054] During the simulation of wind-induced vibration, it is sufficient to ensure that the generalized force Q(t) is the same, that is, to ensure that the mass term is the same, which means that the following needs to be satisfied:

[0055]

[0056] During the structural vibration, the module vibrates at its highest point, then returns to its equilibrium position. In the experiment, a prototype photovoltaic module was selected to ensure that its mass M was the same in the wind vibration simulation, i.e., M... 实际 =M 模拟 All that's left is to satisfy That's it.

[0057] The vibration mode of the component can be described by simple harmonic motion, and its acceleration can be expressed as: acceleration It depends only on the amplitude A and the vibration frequency ω of the structure, and ultimately needs to satisfy:

[0058]

[0059] For cable-supported photovoltaic modules with real-world structures, vibrations in real wind environments typically occur with large amplitudes and low frequencies. Based on the theoretical derivation above, ensuring the parameters are equal allows for simulation of wind-induced vibrations in the laboratory. Therefore, in experiments, small-amplitude, high-frequency vibrations can be used to ensure acceleration. The same as. On the other hand, it can greatly shorten the test cycle.

[0060] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A wind vibration simulation device for cable-supported photovoltaic modules, characterized in that, The system includes a cable support section (1) for installing photovoltaic modules (5), a side anchor section (2) for fixing the cable support section (1), a wind vibration simulation section (3) for exciting the vibration of the cable support section (1), and a detection section (4) for detecting the state of the photovoltaic modules (5). The cable support section (1) includes multiple steel cables (11) and cable anchors (12). The ends of the steel cables (11) are connected to the side anchor section (2) through the cable anchors (12). The excitation end of the wind vibration simulation section (3) is connected to the steel cables (11). The simulation unit (3) includes a base (34), a vibration transmission rod (32), a steering device (33), and an exciter (31). The exciter (31) is mounted on the base (34), the vibration transmission rod (32) is sleeved on the steel cable (11), the excitation end of the exciter (31) is equipped with the steering device (33), and the vibration transmission rod (32) is mounted on the steering device (33). The steering device (33) includes a horizontal vibration steering device (331), a vertical vibration steering device (332), and a torsional vibration steering device (333).

2. The wind vibration simulation device for cable-supported photovoltaic modules according to claim 1, characterized in that, The side anchor (2) includes a side post (21), a first side post lug (22), a second side post lug (23) and a ground anchor cable (24) disposed at both ends of the cable support (1). The first side post lug (22) and the second side post lug (23) are disposed on both sides of the side post (21). The ground anchor cable (24) is hinged to the second side post lug (23), and the first side post lug (22) is hinged to the cable anchor (12).

3. The wind vibration simulation device for cable-supported photovoltaic modules according to claim 1, characterized in that, The detection unit (4) includes a cable force gauge (41) for detecting the tension of the steel cable (11), a displacement gauge for detecting the displacement of the photovoltaic module (5), an accelerometer (43) for detecting the acceleration of the photovoltaic module (5), and a microcrack detection device (44) for detecting microcracks in the photovoltaic module (5). The cable force gauge (41) is installed on the steel cable (11).

4. The wind vibration simulation device for cable-supported photovoltaic modules according to claim 3, characterized in that, The displacement meter includes a horizontal laser displacement meter (42) and a vertical laser displacement meter (45). The horizontal laser displacement meter (42) is installed on either the left or right side of the photovoltaic module (5), and the vertical laser displacement meter (45) is installed on either the upper or lower side of the photovoltaic module (5).

5. The wind vibration simulation device for cable-supported photovoltaic modules according to claim 3, characterized in that, The accelerometer (43) is installed at the four corners of the photovoltaic module (5).

6. The wind vibration simulation device for cable-supported photovoltaic modules according to any one of claims 1-5, characterized in that, The cable support (1) also includes a latch (13) for connecting the photovoltaic module (5), and the latch (13) is detachably locked onto the steel cable (11).

7. A method for simulating wind vibration of cable-supported photovoltaic modules, characterized in that, The wind vibration simulation device for cable-supported photovoltaic modules according to any one of claims 1-6 includes the following steps: S1. Obtain the structural frequency and maximum vibration displacement of the photovoltaic module (5) in a wind environment; S2. Convert the frequency and amplitude of the real structure to obtain the appropriate simulation frequency and amplitude; S3. Complete the construction of the wind vibration simulation device for cable-supported photovoltaic modules, and measure and adjust the frequency and amplitude of the simulated structure; S4. After the simulated wind vibration test is completed, the parameters of the photovoltaic module (5) are sampled and collected, and the module microcrack test and power generation test are performed.

8. The method for simulating wind vibration of cable-supported photovoltaic modules according to claim 7, characterized in that, In step S1, a finite element model of the cable-supported photovoltaic module is established to obtain its structural frequency, and a flutter analysis is performed on it to calculate the maximum vibration displacement that occurs in a windy environment; or the structural frequency and maximum vibration displacement under strong wind are obtained based on the actual field measurement data of the real array.

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