Method and device for calculating stress of photovoltaic module connector based on wind tunnel test data

Abstract

The present application relates to the field of photovoltaic technology, and discloses a method and device for calculating stress of photovoltaic module connecting piece based on wind tunnel test data, wherein the average wind pressure force coefficient and the standard deviation of wind pressure force coefficient of each measuring point on the surface of the photovoltaic panel are calculated based on the wind tunnel test data; the maximum wind pressure force coefficient and the minimum wind pressure force coefficient of each measuring point of the photovoltaic panel under different wind direction angles are obtained based on the average wind pressure force coefficient and the standard deviation of wind pressure force coefficient, so as to obtain the wind load shape coefficient of the surface of the photovoltaic panel; the normal wind resultant force of a single photovoltaic panel, the bending moment around the x-axis of the photovoltaic panel and the bending moment around the y-axis of the photovoltaic panel and the wind pressure force coefficient thereof are calculated based on the wind load shape coefficient; then the normal wind resultant force of the fixed pressing block of the photovoltaic panel is calculated; and the stress of the connecting piece of the photovoltaic panel is calculated based on the normal wind resultant force of the fixed pressing block of the photovoltaic panel. The present application can effectively determine the stress of the photovoltaic panel under the wind load, ensure the stability and safety of the structure, and accurately calculate the stress of the connecting piece of the photovoltaic panel.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of photovoltaic technology, and particularly relates to a method and device for calculating stress of a photovoltaic module connector based on wind tunnel test data. BACKGROUND

[0002] With the proposal of the national "double carbon" index, photovoltaic power generation technology is vigorously promoted in China, and ground photovoltaic power generation accounts for a large proportion. A photovoltaic system mainly consists of photovoltaic modules, supports, inverters, cables and control equipment; among them, the support is a relatively important component of the photovoltaic system. The support is used to support the photovoltaic module to form the best inclination angle. In poor terrain such as mountains and fish ponds, the photovoltaic support is the key to the photovoltaic project and plays a decisive role. However, the installation of the photovoltaic support is significantly affected by the wind load, and the wind load body shape coefficient on the surface of the photovoltaic module cannot be accurately calculated at present, which leads to the inability to select appropriate photovoltaic panel connectors, thereby affecting the installation of the photovoltaic support. SUMMARY

[0003] Therefore, the present application provides a method and device for calculating stress of a photovoltaic module connector based on wind tunnel test data, so as to solve the problem that the wind load body shape coefficient on the surface of the photovoltaic module cannot be accurately calculated, which leads to the inability to select appropriate photovoltaic panel connectors.

[0004] In a first aspect, the present application provides a method for calculating stress of a photovoltaic module connector based on wind tunnel test data, the photovoltaic module comprising a photovoltaic panel, a photovoltaic panel fixing block and a photovoltaic panel connector; the method comprising:

[0005] calculating the wind pressure coefficient of each measuring point on the surface of the photovoltaic panel based on the wind tunnel test data, and calculating the average wind pressure coefficient of each measuring point on the surface of the photovoltaic panel;

[0006] calculating the standard deviation of the wind pressure coefficient of each measuring point on the surface of the photovoltaic panel based on the average wind pressure coefficient;

[0007] obtaining the maximum wind pressure coefficient and the minimum wind pressure coefficient of each measuring point of the photovoltaic panel under different wind direction angles based on the average wind pressure coefficient and the standard deviation of the wind pressure coefficient;

[0008] obtaining the wind load body shape coefficient on the surface of the photovoltaic panel based on the maximum wind pressure coefficient and the minimum wind pressure coefficient;

[0009] calculating the normal wind resultant force of a single photovoltaic panel, the bending moment around the x-axis of the photovoltaic panel and the bending moment around the y-axis of the photovoltaic panel based on the wind load body shape coefficient;

[0010] Based on the single piece photovoltaic panel normal wind resultant force, the bending moment around the x axis of the photovoltaic panel and the bending moment around the y axis of the photovoltaic panel, the wind pressure force coefficient of the single piece photovoltaic panel normal wind resultant force, the wind pressure force coefficient of the bending moment around the x axis of the photovoltaic panel and the wind pressure force coefficient of the bending moment around the y axis of the photovoltaic panel are calculated;

[0011] Based on the wind pressure force coefficient of the single piece photovoltaic panel normal wind resultant force, the wind pressure force coefficient of the bending moment around the x axis of the photovoltaic panel and the wind pressure force coefficient of the bending moment around the y axis of the photovoltaic panel, the normal wind resultant force of the photovoltaic panel fixed pressing block is calculated.

[0012] Based on the normal wind resultant force of the photovoltaic panel fixed pressing block, the stress of the photovoltaic panel connecting piece is calculated.

[0013] Beneficial effects: based on the wind tunnel test data, the average wind pressure force coefficient and the wind pressure force coefficient standard deviation of each measuring point on the surface of the photovoltaic panel are calculated; based on the average wind pressure force coefficient and the wind pressure force coefficient standard deviation, the maximum wind pressure force coefficient and the minimum wind pressure force coefficient of each measuring point on the photovoltaic panel under different wind direction angles are obtained to obtain the wind load shape coefficient of the surface of the photovoltaic panel; the wind load shape coefficient of the surface of the photovoltaic panel obtained by the above method has statistical significance, effectively determines the stress condition of the photovoltaic panel under the wind load, and ensures the stability and safety of the structure; based on the wind load shape coefficient, the normal wind resultant force, the bending moment around the x axis of the photovoltaic panel and the bending moment around the y axis of the photovoltaic panel of the single piece photovoltaic panel are calculated, and the wind pressure force coefficient of the normal wind resultant force, the bending moment around the x axis of the photovoltaic panel and the bending moment around the y axis of the photovoltaic panel are calculated; then the normal wind resultant force of the photovoltaic panel fixed pressing block is calculated; based on the normal wind resultant force of the photovoltaic panel fixed pressing block, the stress of the photovoltaic panel connecting piece is calculated; through the accurate wind load shape coefficient, the stress of the photovoltaic panel connecting piece can be accurately calculated, so that the suitable connecting piece model can be more accurately selected.

[0014] In an optional embodiment, the calculation of the wind pressure force coefficient of each measuring point on the surface of the photovoltaic panel based on the wind tunnel test data, and the calculation of the average wind pressure force coefficient of each measuring point on the surface of the photovoltaic panel, comprises:

[0015] The calculation formula of the wind pressure force coefficient of each measuring point on the surface of the photovoltaic panel is:

[0016]

[0017] Wherein, μ si is the wind pressure force coefficient of the i th measuring point of the photovoltaic panel, ω i is the net wind pressure of the i th measuring point of the photovoltaic panel, p0 is the static pressure of the reference point, p a is the total pressure of the reference point;

[0018] The calculation formula of the average wind pressure force coefficient of each measuring point on the surface of the photovoltaic panel is:

[0019]

[0020] wherein, is the average wind pressure coefficient of each measuring point on the surface of the photovoltaic panel, t is the wind pressure test duration, and N is the total number of wind pressure coefficients of each measuring point on the surface of the photovoltaic panel.

[0021] In an optional implementation, the calculating the standard deviation of the wind pressure coefficient of each measuring point on the surface of the photovoltaic panel based on the average wind pressure coefficient comprises:

[0022] The calculation formula for calculating the standard deviation of the wind pressure coefficient of each measuring point on the surface of the photovoltaic panel is:

[0023]

[0024] wherein, σ si is the standard deviation of the wind pressure coefficient, μ si is the wind pressure coefficient of the i-th measuring point of the photovoltaic panel, is the average wind pressure coefficient of each measuring point on the surface of the photovoltaic panel, t is the wind pressure test duration, and N is the total number of wind pressure coefficients of each measuring point on the surface of the photovoltaic panel.

[0025] In an optional implementation, the obtaining the maximum wind pressure coefficient and the minimum wind pressure coefficient of each measuring point of the photovoltaic panel under different wind direction angles based on the average wind pressure coefficient and the standard deviation of the wind pressure coefficient comprises:

[0026] obtaining the total average wind pressure coefficient of each measuring point within each test time period under a single wind direction angle;

[0027] selecting the maximum wind pressure coefficient and the minimum wind pressure coefficient of each measuring point within each test time period under the single wind direction angle based on the total average wind pressure coefficient;

[0028] obtaining all the maximum wind pressure coefficients and the minimum wind pressure coefficients of each measuring point within each test time period under the single wind direction angle;

[0029] respectively obtaining the average values of the maximum wind pressure coefficients and the minimum wind pressure coefficients, and taking the average values of the maximum wind pressure coefficients and the minimum wind pressure coefficients as the maximum wind pressure coefficient and the minimum wind pressure coefficient of each measuring point under the single wind direction angle.

[0030] In an optional implementation, the obtaining the wind load shape coefficient of the surface of the photovoltaic panel based on the maximum wind pressure coefficient and the minimum wind pressure coefficient comprises:

[0031] Based on the maximum wind pressure coefficient and the minimum wind pressure coefficient, an unbiased estimation method is used to obtain the wind load shape coefficient on the surface of the photovoltaic panel.

[0032] In an optional embodiment, the calculating of the normal wind resultant force of a single photovoltaic panel, the bending moment about the x-axis of the photovoltaic panel, and the bending moment about the y-axis of the photovoltaic panel based on the wind load shape coefficient includes:

[0033] The calculation formula for calculating the normal wind force of a single photovoltaic panel is:

[0034]

[0035] Among them, F Z is the normal wind force of a single photovoltaic panel, c i is the wind vibration coefficient of each pressure measuring point, A i is the wind load action area borne by each pressure measuring point, μ si is the wind pressure coefficient of the ith measuring point of the photovoltaic panel, μ z is the wind pressure height variation coefficient, w0 is the basic wind pressure, and n is the number of pressure measurement points on each photovoltaic panel;

[0036] The calculation formula for calculating the bending moment around the x-axis of the photovoltaic panel is:

[0037]

[0038] Among them, M x is the bending moment around the x-axis of the photovoltaic panel, y i is the i-th pressure measuring point on the y-axis;

[0039] The calculation formula for calculating the bending moment around the y-axis of the photovoltaic panel is:

[0040]

[0041] Among them, M y Bending moment around the y-axis of the photovoltaic panel, x i is the i-th pressure measuring point on the x-axis.

[0042] In an optional embodiment, the calculating, based on the normal wind resultant force of the single photovoltaic panel, the bending moment around the x-axis of the photovoltaic panel, and the bending moment around the y-axis of the photovoltaic panel, the wind pressure coefficient of the normal wind resultant force of the single photovoltaic panel, the wind pressure coefficient of the bending moment around the x-axis of the photovoltaic panel, and the wind pressure coefficient of the bending moment around the y-axis of the photovoltaic panel, includes:

[0043] The calculation formula of the wind pressure coefficient of the normal wind resultant force of a single photovoltaic panel is:

[0044]

[0045] in, wind pressure coefficient of normal wind force of single photovoltaic panel, F z normal wind force of single photovoltaic panel, c i wind vibration coefficient of each pressure measuring point, A i wind load acting area borne by each pressure measuring point, μ si wind pressure coefficient of the i th pressure measuring point of photovoltaic panel, μ z wind pressure height change coefficient, w0 is basic wind pressure, n is the number of pressure measuring points on each photovoltaic panel, L is the length of single photovoltaic panel, and B is the width of single photovoltaic panel;

[0046] The calculation formula of the wind pressure coefficient of the bending moment around the x-axis of the photovoltaic panel is:

[0047]

[0048] wherein, wind pressure coefficient of the bending moment around the x-axis of the photovoltaic panel, M x bending moment around the x-axis of the photovoltaic panel, y i the i th pressure measuring point on the x-axis, L y the length between two connecting pieces in the y-axis direction;

[0049] The calculation formula of the wind pressure coefficient of the bending moment around the y-axis of the photovoltaic panel is:

[0050]

[0051] wherein, μ s,My wind pressure coefficient of the bending moment around the y-axis of the photovoltaic panel, M y bending moment around the y-axis of the photovoltaic panel, x i the i th pressure measuring point on the y-axis.

[0052] In an alternative embodiment, the normal wind force of the photovoltaic panel fixing block is calculated based on the wind pressure coefficient of the normal wind force of the single photovoltaic panel, the wind pressure coefficient of the bending moment around the x-axis of the photovoltaic panel, and the wind pressure coefficient of the bending moment around the y-axis of the photovoltaic panel, comprising:

[0053] The photovoltaic panel fixing block is provided with four, and the calculation formula of the normal wind force of the four photovoltaic panel fixing blocks is:

[0054]

[0055] wherein, F z,1 normal wind force of the first photovoltaic panel fixing block, F z,2 normal wind force of the second photovoltaic panel fixing block, F z,3 normal wind force of the third photovoltaic panel fixing block, F z,4Normal wind resultant force of the kth photovoltaic panel fixing block, F Z Normal wind resultant force of the single photovoltaic panel, M x Bending moment around the x-axis of the photovoltaic panel, M y Bending moment around the y-axis of the photovoltaic panel, μ z Wind pressure height variation coefficient, w0 is the basic wind pressure, L is the length of the single photovoltaic panel, and B is the width of the single photovoltaic panel.

[0056] In an optional embodiment, the stress of the photovoltaic panel connector is calculated based on the normal wind resultant force of the photovoltaic panel fixing block, and the stress of the photovoltaic panel connector is calculated based on the normal wind resultant force of the photovoltaic panel fixing block.

[0057] The calculation formula for calculating the stress of the photovoltaic panel connector is:

[0058]

[0059] Wherein, σ k Stress of the kth photovoltaic panel connector, F z,k Normal wind resultant force of the kth photovoltaic panel fixing block, A U Area of the photovoltaic panel connector, d k Diameter of the kth photovoltaic panel connector, [σ] is the average stress of the steel strength;

[0060] In response to the stress of the photovoltaic panel connector being less than or equal to the average stress of the steel strength, the diameter of the photovoltaic panel connector is obtained as:

[0061] In a second aspect, the present application further provides a device for calculating the stress of a photovoltaic module connector based on wind tunnel test data, and the device comprises:

[0062] A first calculation module is configured to calculate the wind pressure force coefficient of each measuring point on the surface of the photovoltaic panel based on the wind tunnel test data, and calculate the average wind pressure force coefficient of each measuring point on the surface of the photovoltaic panel;

[0063] A second calculation module is configured to calculate the standard deviation of the wind pressure force coefficient of each measuring point on the surface of the photovoltaic panel based on the average wind pressure force coefficient;

[0064] A first acquisition module is configured to acquire the maximum wind pressure coefficient and the minimum wind pressure coefficient of each measuring point of the photovoltaic panel under different wind direction angles based on the average wind pressure force coefficient and the standard deviation of the wind pressure force coefficient;

[0065] A second acquisition module is configured to obtain the wind load shape coefficient of the surface of the photovoltaic panel based on the maximum wind pressure coefficient and the minimum wind pressure coefficient;

[0066] The third calculation module is configured to calculate a normal wind resultant force of a single photovoltaic panel, a bending moment around an x-axis of the photovoltaic panel and a bending moment around a y-axis of the photovoltaic panel based on the wind load shape coefficient.

[0067] The fourth calculation module is configured to calculate a wind pressure force coefficient of the normal wind resultant force of the single photovoltaic panel, a wind pressure force coefficient of the bending moment around the x-axis of the photovoltaic panel and a wind pressure force coefficient of the bending moment around the y-axis of the photovoltaic panel based on the normal wind resultant force of the single photovoltaic panel, the bending moment around the x-axis of the photovoltaic panel and the bending moment around the y-axis of the photovoltaic panel.

[0068] The fifth calculation module is configured to calculate a normal wind resultant force of a photovoltaic panel fixing block based on the wind pressure force coefficient of the normal wind resultant force of the single photovoltaic panel, the wind pressure force coefficient of the bending moment around the x-axis of the photovoltaic panel and the wind pressure force coefficient of the bending moment around the y-axis of the photovoltaic panel.

[0069] The sixth calculation module is configured to calculate a stress of a photovoltaic panel connecting piece based on the normal wind resultant force of the photovoltaic panel fixing block.

[0070] In a third aspect, the present application further provides an electronic device, comprising a memory, a processor, a communication interface and a communication bus, the processor, the memory and the communication interface complete communication with each other through the communication bus;

[0071] The memory is used to store at least one executable instruction, and the executable instruction causes the processor to execute the method for calculating the stress of the photovoltaic module connecting piece based on the wind tunnel test data according to any one of the above.

[0072] In a fourth aspect, the present application further provides a computer readable storage medium, and the storage medium stores at least one executable instruction, and the executable instruction runs on the device for calculating the stress of the photovoltaic module connecting piece based on the wind tunnel test data, so that the device for calculating the stress of the photovoltaic module connecting piece based on the wind tunnel test data executes the method for calculating the stress of the photovoltaic module connecting piece based on the wind tunnel test data according to any one of the above.

[0073] The above description is only a summary of the technical scheme of the embodiments of the present application, in order to more clearly understand the technical means of the embodiments of the present application, the content of the specification can be implemented, and in order to make the above and other purposes, characteristics and advantages of the embodiments of the present application more obvious and easy to understand, the specific embodiments of the present application are described below. BRIEF DESCRIPTION OF DRAWINGS

[0074] In order to more clearly illustrate the specific embodiments of the present application or the technical scheme in the prior art, the drawings needed in the specific embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creating additional labor.

[0075] Figure 1 is a flowchart of a method for calculating stress of a photovoltaic module connector based on wind tunnel test data according to an embodiment of the present application;

[0076] Figure 2 is a flowchart of another method for calculating stress of a photovoltaic module connector based on wind tunnel test data according to an embodiment of the present application;

[0077] Figure 3 is a schematic diagram of a photovoltaic module according to an embodiment of the present application;

[0078] Figure 4 is a structural diagram of an embodiment of a device for calculating stress of a photovoltaic module connector based on wind tunnel test data according to an embodiment of the present application;

[0079] Figure 5 is a structural diagram of an embodiment of an electronic device according to an embodiment of the present application. DETAILED DESCRIPTION

[0080] Exemplary embodiments of the present application will be described in greater detail below with reference to the accompanying drawings. While exemplary embodiments of the present application are shown in the drawings, it is understood that the present application can be embodied in various forms and should not be limited by the embodiments set forth herein.

[0081] With the proposal of the national "double carbon" target, domestic photovoltaic power generation technology is vigorously promoted, among which ground photovoltaic occupies a large proportion. A photovoltaic system mainly consists of photovoltaic modules, supports, inverters, cables and control equipment; among them, the support is a relatively important component of the photovoltaic system. The support is used to support the photovoltaic module to form the best inclination angle. In poor terrain such as mountains and fish ponds, the photovoltaic support is the key to the photovoltaic project and plays a decisive role.

[0082] The widely used fixed support in the photovoltaic project adopts a beam-column frame system. The column spacing of this system is small, generally less than 5 meters, and the adaptability to complex terrain such as mountains is poor, which brings great difficulties to the construction site leveling and support installation. The flexible support includes a high-strength cable support component, which can effectively increase the column spacing to effectively increase the power generation capacity. However, the construction requirement of the flexible support is higher, and the wind load has a key influence on the flexible photovoltaic support. Moreover, the wind load shape coefficient on the surface of the photovoltaic module cannot be accurately calculated at present, which leads to the inability to select appropriate photovoltaic panel connectors, thereby affecting the installation of the photovoltaic support.

[0083] The current "Building Structure Load Code" (GB50009-2012) and "Photovoltaic Support Structure Design Regulations" (NB / T10115-2018) give a calculation method for the wind load shape coefficient of the photovoltaic panel in the whole block range, and the calculation method of the wind load shape coefficient is as follows:

[0084] w k =β z μ s μ z w0

[0085] Wherein, w k is the standard value of wind load on the structure member, β z is the wind vibration coefficient at the height z, μ s is the wind load shape coefficient, μ z is the wind pressure height variation coefficient, and w0 is the basic wind pressure.

[0086] Based on this, as Figures 1-3 shown, the embodiment of the present application provides a method for calculating the stress of photovoltaic module connecting piece based on wind tunnel test data, the photovoltaic module includes photovoltaic panel 10, photovoltaic panel fixing block and photovoltaic panel connecting piece; the method comprises the following steps: calculating the wind pressure coefficient of each measuring point on the surface of the photovoltaic panel based on the wind tunnel test data, and calculating the average wind pressure coefficient of each measuring point on the surface of the photovoltaic panel; calculating the standard deviation of the wind pressure coefficient of each measuring point on the surface of the photovoltaic panel based on the average wind pressure coefficient; obtaining the maximum wind pressure coefficient and the minimum wind pressure coefficient of each measuring point of the photovoltaic panel under different wind direction angles based on the average wind pressure coefficient and the standard deviation of the wind pressure coefficient; obtaining the wind load shape coefficient of the surface of the photovoltaic panel based on the maximum wind pressure coefficient and the minimum wind pressure coefficient; calculating the normal wind resultant force of a single photovoltaic panel, the bending moment around the x-axis of the photovoltaic panel and the bending moment around the y-axis of the photovoltaic panel based on the wind load shape coefficient; calculating the wind pressure coefficient of the normal wind resultant force of a single photovoltaic panel, the wind pressure coefficient of the bending moment around the x-axis of the photovoltaic panel and the wind pressure coefficient of the bending moment around the y-axis of the photovoltaic panel based on the normal wind resultant force of a single photovoltaic panel, the bending moment around the x-axis of the photovoltaic panel and the bending moment around the y-axis of the photovoltaic panel; calculating the normal wind resultant force of the photovoltaic panel fixing block based on the wind pressure coefficient of the normal wind resultant force of a single photovoltaic panel, the wind pressure coefficient of the bending moment around the x-axis of the photovoltaic panel and the wind pressure coefficient of the bending moment around the y-axis of the photovoltaic panel; calculating the stress of the photovoltaic panel connecting piece based on the normal wind resultant force of the photovoltaic panel fixing block.

[0087] The wind load shape coefficient of the surface of the photovoltaic panel obtained by the above method has statistical significance, effectively determines the stress condition of the photovoltaic panel under the wind load, and ensures the stability and safety of the structure; the stress of the photovoltaic panel connecting piece can be accurately calculated through the accurate wind load shape coefficient, so that the suitable connecting piece model can be more accurately selected.

[0088] The following introduces a specific embodiment of a method for calculating stress of a photovoltaic module connector based on wind tunnel test data, Figure 1 is a flowchart of a method for calculating stress of a photovoltaic module connector based on wind tunnel test data provided by an embodiment of the present application. The present specification provides method operation steps as in the embodiments or flowcharts, but more or fewer operation steps can be included based on conventional or non-inventive labor. The order of steps listed in the embodiments is only one of the many execution orders of the steps, and does not represent the only execution order. In actual system or server product execution, the method order shown in the embodiments or the drawings can be executed in sequence or in parallel (for example, in a parallel processor or multi-thread processing environment). Specifically as shown in Figure 1 , the method can include:

[0089] Step S100, calculating wind pressure force coefficients of each measuring point on the surface of the photovoltaic panel based on wind tunnel test data, and calculating average wind pressure force coefficients of each measuring point on the surface of the photovoltaic panel.

[0090] In the embodiment, the calculation formula for calculating the wind pressure force coefficients of each measuring point on the surface of the photovoltaic panel is:

[0091]

[0092] wherein μ si is the wind pressure force coefficient of the i th measuring point of the photovoltaic panel, ω i is the net wind pressure of the i th measuring point of the photovoltaic panel, p0 is the static pressure of the reference point, pa is the total pressure of the reference point; p0-p a = 0.5 ρv 2 , ρ is the air density, and v is the wind speed of the reference point.

[0093] The calculation formula for the net wind pressure of the i th measuring point of the photovoltaic panel is: ω i = p(t)-p0, wherein p(t) is the wind pressure time history measured by the i th measuring point of the photovoltaic panel in the wind load test.

[0094] The calculation formula for calculating the average wind pressure force coefficients of each measuring point on the surface of the photovoltaic panel is:

[0095]

[0096] wherein μ is the average wind pressure force coefficient of each measuring point on the surface of the photovoltaic panel, t is the wind pressure test duration, and N is the total number of wind pressure force coefficients of each measuring point on the surface of the photovoltaic panel.

[0097] Step S200, calculating the standard deviation of the wind pressure force coefficients of each measuring point on the surface of the photovoltaic panel based on the average wind pressure force coefficients.

[0098] In this embodiment, the calculation formula of the standard deviation of the wind pressure coefficient of each measuring point on the surface of the photovoltaic panel is:

[0099]

[0100] wherein σ si is the standard deviation of the wind pressure coefficient, μ si is the wind pressure coefficient of the i th measuring point of the photovoltaic panel, is the average wind pressure coefficient of each measuring point on the surface of the photovoltaic panel, t is the wind pressure test time length, and N is the total number of wind pressure coefficients of each measuring point on the surface of the photovoltaic panel.

[0101] Step S300, based on the average wind pressure coefficient and the standard deviation of the wind pressure coefficient, obtaining the maximum wind pressure coefficient and the minimum wind pressure coefficient of each measuring point of the photovoltaic panel under different wind direction angles.

[0102] In this embodiment, as shown in Figure 2 , step S300 further comprises the following steps:

[0103] S310, obtaining the total average wind pressure coefficient of each test time period of a single measuring point under a single wind direction angle.

[0104] In the process of testing the wind pressure coefficient of the photovoltaic panel, the overall test time is divided into multiple test time periods, and multiple measuring points are arranged on the surface of the photovoltaic panel. When testing, each measuring point needs to be tested under different wind direction angles. When obtaining the average wind pressure coefficient, the average wind pressure coefficient of each test time period of a single measuring point under a single wind direction angle is first obtained to obtain all the average wind pressure coefficients of a single measuring point under a single wind direction angle.

[0105] S320, based on the total average wind pressure coefficient, selecting the maximum wind pressure coefficient and the minimum wind pressure coefficient of each test time period of a single measuring point under a single wind direction angle.

[0106] After obtaining all the average wind pressure coefficients, for each measuring point, a maximum wind pressure coefficient and a minimum wind pressure coefficient will be selected from the average wind pressure coefficients of each test time period of a single wind direction angle. The maximum wind pressure coefficient and the minimum wind pressure coefficient are selected for standby.

[0107] S330, obtaining all the maximum wind pressure coefficients and the minimum wind pressure coefficients of each test time period of a single wind direction angle of each measuring point of the photovoltaic panel.

[0108] Further, all the maximum wind pressure coefficients of each test time period of a single wind direction angle of each measuring point on the surface of the photovoltaic panel are obtained.and minimum wind pressure coefficient to be standby.

[0109] S340, respectively, the average value of the maximum wind pressure coefficient and the minimum wind pressure coefficient is obtained, and the average value of the maximum wind pressure coefficient and the minimum wind pressure coefficient is taken as the maximum wind pressure coefficient and the minimum wind pressure coefficient of a single measuring point under a single wind direction angle.

[0110] All the maximum wind pressure coefficients and minimum wind pressure coefficients obtained are respectively summed up to obtain the average value of the maximum wind pressure coefficient and the minimum wind pressure coefficient , and the maximum wind pressure coefficient and the minimum wind pressure coefficient of a single measuring point under a single wind direction angle are obtained.

[0111] In other embodiments, after obtaining the maximum wind pressure coefficient and the minimum wind pressure coefficient of a single measuring point under a single wind direction angle, for each measuring point, there is a maximum wind pressure coefficient and a minimum wind pressure coefficient under each wind direction angle; at this time, a maximum value is found in the maximum wind pressure coefficients of all wind direction angles, which is recorded as the maximum maximum wind pressure coefficient For each measuring point, a minimum value is found in the minimum wind pressure coefficients of all wind direction angles, which is recorded as the minimum minimum wind pressure coefficient By obtaining the maximum wind pressure coefficient and the minimum wind pressure coefficient of all measuring points under all wind direction angles, the wind load shape coefficient of the surface of the photovoltaic panel can be accurately calculated.

[0112] Step S400, obtaining the wind load shape coefficient of the surface of the photovoltaic panel based on the maximum wind pressure coefficient and the minimum wind pressure coefficient.

[0113] In this embodiment, based on the maximum wind pressure coefficient and the minimum wind pressure coefficient, the wind load shape coefficient of the surface of the photovoltaic panel is obtained by using the unbiased estimation method. The wind load shape coefficient of the surface of the photovoltaic panel obtained by the unbiased estimation method has more statistical significance, helps to determine the stress condition of the photovoltaic panel assembly under the wind load, and ensures the stability and safety of the structure; it can also help to select a more economical design and installation scheme under the premise of ensuring safety.

[0114] Step S500, calculating the normal wind resultant force of a single photovoltaic panel, the bending moment around the x-axis of the photovoltaic panel and the bending moment around the y-axis of the photovoltaic panel based on the wind load shape coefficient.

[0115] In this embodiment, the calculation formula of the normal wind resultant force of a single photovoltaic panel is:

[0116]

[0117] wherein, F Z is the normal wind force of the single photovoltaic panel, c i is the wind vibration coefficient of each pressure measuring point, A i is the wind load action area borne by each pressure measuring point, μ si is the wind pressure force coefficient of the i-th pressure measuring point of the photovoltaic panel, μ z is the wind pressure height variation coefficient, w0 is the basic wind pressure, and n is the number of pressure measuring points on each photovoltaic panel.

[0118] The calculation formula of the bending moment around the x-axis of the photovoltaic panel is:

[0119]

[0120] wherein, M x is the bending moment around the x-axis of the photovoltaic panel, y i is the i-th pressure measuring point on the y-axis.

[0121] The calculation formula of the bending moment around the y-axis of the photovoltaic panel is:

[0122]

[0123] wherein, M y is the bending moment around the y-axis of the photovoltaic panel, x i is the i-th pressure measuring point on the x-axis.

[0124] Step S600, based on the normal wind force of the single photovoltaic panel, the bending moment around the x-axis of the photovoltaic panel, and the bending moment around the y-axis of the photovoltaic panel, the wind pressure force coefficient of the normal wind force of the single photovoltaic panel, the wind pressure force coefficient of the bending moment around the x-axis of the photovoltaic panel, and the wind pressure force coefficient of the bending moment around the y-axis of the photovoltaic panel are calculated.

[0125] In this embodiment, the calculation formula of the wind pressure force coefficient of the normal wind force of the single photovoltaic panel is:

[0126]

[0127] wherein, is the wind pressure force coefficient of the normal wind force of the single photovoltaic panel, F z is the normal wind force of the single photovoltaic panel, c i is the wind vibration coefficient of each pressure measuring point, A i is the wind load action area borne by each pressure measuring point, μ si is the wind pressure force coefficient of the i-th pressure measuring point of the photovoltaic panel, μ z is the wind pressure height variation coefficient, w0 is the basic wind pressure, n is the number of pressure measuring points on each photovoltaic panel, L is the length of the single photovoltaic panel, and B is the width of the single photovoltaic panel.

[0128] The calculation formula of the wind pressure force coefficient of the bending moment around the x-axis of the photovoltaic panel is:

[0129]

[0130] wherein μ s,Mx is the wind pressure coefficient of the bending moment around the x-axis of the photovoltaic panel, M x is the bending moment around the x-axis of the photovoltaic panel, y i is the i-th pressure measuring point on the y-axis, L y is the length between two connectors in the y-axis direction.

[0131] The calculation formula of the wind pressure coefficient of the bending moment around the y-axis of the photovoltaic panel is:

[0132]

[0133] wherein μ s,My is the wind pressure coefficient of the bending moment around the y-axis of the photovoltaic panel, M y is the bending moment around the y-axis of the photovoltaic panel, x i is the i-th pressure measuring point on the x-axis.

[0134] Step S700, based on the wind pressure coefficient of the normal wind resultant force of the single photovoltaic panel, the wind pressure coefficient of the bending moment around the x-axis of the photovoltaic panel, and the wind pressure coefficient of the bending moment around the y-axis of the photovoltaic panel, the normal wind resultant force of the photovoltaic panel fixing block is calculated.

[0135] As shown in Figure 3 , since the wind load distribution in the whole panel of the photovoltaic panel is uneven, the photovoltaic panel 10 and the assembly cable 30 are connected by four photovoltaic panel connectors, so the stress of the connectors is also different. In order to accurately calculate the internal force of the connector and thus reasonably design the connector, in the embodiment, the photovoltaic panel fixing block is provided with four photovoltaic panel fixing blocks including photovoltaic panel fixing block 1, photovoltaic panel fixing block 2, photovoltaic panel fixing block 3 and photovoltaic panel fixing block 4. The calculation formula for calculating the normal wind resultant force of the four photovoltaic panel fixing blocks is:

[0136]

[0137] wherein F z,1 is the normal wind resultant force of the first photovoltaic panel fixing block, F z,2 is the normal wind resultant force of the second photovoltaic panel fixing block, F z,3 is the normal wind resultant force of the third photovoltaic panel fixing block, F z,4 is the normal wind resultant force of the fourth photovoltaic panel fixing block, F Z is the normal wind resultant force of the single photovoltaic panel, M x is the bending moment around the x-axis of the photovoltaic panel, M y is the bending moment around the y-axis of the photovoltaic panel, μ z is the wind pressure height variation coefficient, w0 is the basic wind pressure, L is the length of the single photovoltaic panel, and B is the width of the single photovoltaic panel.

[0138] Step S800, based on the normal wind resultant force of the photovoltaic panel fixing block, the stress of the photovoltaic panel connecting piece is calculated.

[0139] In this embodiment, the photovoltaic panel connecting piece can be selected as a U-shaped bolt; the calculation formula of the stress of the photovoltaic panel connecting piece is as follows:

[0140]

[0141] Wherein, σk is the stress of the kth photovoltaic panel connecting piece, Fk is the normal wind resultant force of the kth photovoltaic panel fixing block, A is the area of the photovoltaic panel connecting piece, dk is the diameter of the kth photovoltaic panel connecting piece, and [] is the average stress of the steel strength. k z,k U k

[0142] In response to the stress of the photovoltaic panel connecting piece being less than or equal to the average stress of the steel strength, the diameter of the photovoltaic panel connecting piece is obtained as follows:

[0143] In other embodiments, the stress of the four photovoltaic panel connecting pieces is calculated through the normal wind resultant force of the four photovoltaic panel fixing blocks, so as to determine the diameter of the four photovoltaic panel connecting pieces, and the calculation formula is as follows:

[0144]

[0145]

[0146]

[0147]

[0148] Wherein, σ1 is the stress of the first photovoltaic panel connecting piece, σ2 is the stress of the second photovoltaic panel connecting piece, σ3 is the stress of the third photovoltaic panel connecting piece, σ4 is the stress of the fourth photovoltaic panel connecting piece, d1 is the diameter of the first photovoltaic panel connecting piece, d2 is the diameter of the second photovoltaic panel connecting piece, d3 is the diameter of the third photovoltaic panel connecting piece, and d4 is the diameter of the fourth photovoltaic panel connecting piece.

[0149] ​​​​The method for calculating the stress of the photovoltaic module connecting piece based on the wind tunnel test data provided by the embodiment of the application calculates the average wind pressure coefficient and the wind pressure coefficient standard deviation of each measuring point on the surface of the photovoltaic panel based on the wind tunnel test data; obtains the maximum wind pressure coefficient and the minimum wind pressure coefficient of each measuring point of the photovoltaic panel under different wind direction angles based on the average wind pressure coefficient and the wind pressure coefficient standard deviation, so as to obtain the wind load shape coefficient of the surface of the photovoltaic panel; the wind load shape coefficient of the surface of the photovoltaic panel obtained by the above method has statistical significance, effectively determines the stress condition of the photovoltaic panel under the wind load, and ensures the stability and safety of the structure; the normal wind resultant force of the single photovoltaic panel, the bending moment around the x axis of the photovoltaic panel and the bending moment around the y axis of the photovoltaic panel are calculated based on the wind load shape coefficient, and the wind pressure coefficient of the normal wind resultant force of the single photovoltaic panel, the bending moment around the x axis of the photovoltaic panel and the bending moment around the y axis of the photovoltaic panel are calculated; then the normal wind resultant force of the fixed pressing block of the photovoltaic panel is calculated; the stress of the photovoltaic panel connecting piece is calculated based on the normal wind resultant force of the fixed pressing block of the photovoltaic panel; the stress of the photovoltaic panel connecting piece can be accurately calculated through the accurate wind load shape coefficient, the photovoltaic support structure calculation is closer to the actual load working condition, the suitable connecting piece model is more accurately selected, and the engineering cost is reduced.

[0150] The embodiment of the application further provides a device for calculating the stress of a photovoltaic module connecting piece based on wind tunnel test data, Figure 4 is a structural schematic diagram of the embodiment of the device for calculating the stress of the photovoltaic module connecting piece based on the wind tunnel test data provided by the embodiment of the application, as Figure 4 shown, the device comprises:

[0151] A first calculation module 100 is configured to calculate the wind pressure coefficient of each measuring point on the surface of the photovoltaic panel based on the wind tunnel test data, and calculate the average wind pressure coefficient of each measuring point on the surface of the photovoltaic panel; the calculation formula of the wind pressure coefficient of each measuring point on the surface of the photovoltaic panel is as follows:

[0152]

[0153] wherein, μ si is the wind pressure coefficient of the i th measuring point on the photovoltaic panel, ω i is the net wind pressure of the i th measuring point on the photovoltaic panel, p0 is the static pressure of the reference point, and p a is the total pressure of the reference point.

[0154] The calculation formula of the average wind pressure coefficient of each measuring point on the surface of the photovoltaic panel is as follows:

[0155]

[0156] wherein, is the average wind pressure coefficient of each measuring point on the surface of the photovoltaic panel, t is the wind pressure test duration, and N is the total number of the wind pressure coefficients of each measuring point on the surface of the photovoltaic panel.

[0157] The second calculation module 200 is configured to calculate the standard deviation of the wind pressure coefficients of each measuring point on the surface of the photovoltaic panel based on the average wind pressure coefficient, and the calculation formula of the standard deviation of the wind pressure coefficients of each measuring point on the surface of the photovoltaic panel is:

[0158]

[0159] wherein σ si is the standard deviation of the wind pressure coefficient, μ si is the wind pressure coefficient of the i th measuring point of the photovoltaic panel, μ Z is the average wind pressure coefficient of each measuring point on the surface of the photovoltaic panel, t is the wind pressure test duration, and N is the total number of the wind pressure coefficients of each measuring point on the surface of the photovoltaic panel.

[0160] The first acquisition module 300 is configured to acquire the maximum wind pressure coefficient and the minimum wind pressure coefficient of each measuring point of the photovoltaic panel under different wind direction angles based on the average wind pressure coefficient and the standard deviation of the wind pressure coefficient.

[0161] The second acquisition module 400 is configured to obtain the wind load shape coefficient of the surface of the photovoltaic panel based on the maximum wind pressure coefficient and the minimum wind pressure coefficient.

[0162] The third calculation module 500 is configured to calculate the normal wind resultant force of a single photovoltaic panel, the bending moment around the x axis of the photovoltaic panel, and the bending moment around the y axis of the photovoltaic panel based on the wind load shape coefficient, and the calculation formula of the normal wind resultant force of a single photovoltaic panel is:

[0163]

[0164] wherein F Z is the normal wind resultant force of a single photovoltaic panel, c i is the wind vibration coefficient of each pressure measuring point, A i is the wind load acting area borne by each pressure measuring point, μ si is the wind pressure coefficient of the i th measuring point of the photovoltaic panel, μ z is the wind pressure height variation coefficient, w0 is the basic wind pressure, and n is the number of pressure measuring points on each photovoltaic panel.

[0165] The calculation formula of the bending moment around the x axis of the photovoltaic panel is:

[0166]

[0167] wherein M x is the bending moment around the x axis of the photovoltaic panel, and y i is the i th pressure measuring point on the y axis.

[0168] The calculation formula of the bending moment around the y axis of the photovoltaic panel is:

[0169]

[0170] wherein M y the bending moment around the y-axis of the photovoltaic panel, z i is the i-th measuring point on the x-axis.

[0171] The fourth calculation module 600 is configured to calculate, based on the normal wind resultant force of the single photovoltaic panel, the bending moment around the x-axis of the photovoltaic panel, and the bending moment around the y-axis of the photovoltaic panel, the wind pressure force coefficient of the normal wind resultant force of the single photovoltaic panel, the wind pressure force coefficient of the bending moment around the x-axis of the photovoltaic panel, and the wind pressure force coefficient of the bending moment around the y-axis of the photovoltaic panel; the calculation formula of the wind pressure force coefficient of the normal wind resultant force of the single photovoltaic panel is:

[0172]

[0173] wherein is the wind pressure force coefficient of the normal wind resultant force of the single photovoltaic panel, F z is the normal wind resultant force of the single photovoltaic panel, c i is the wind vibration coefficient of each measuring point, A i is the wind load action area borne by each measuring point, μ si is the wind pressure force coefficient of the i-th measuring point of the photovoltaic panel, μ z is the wind pressure height variation coefficient, w0 is the basic wind pressure, n is the number of measuring points on each photovoltaic panel, L is the length of the single photovoltaic panel, and B is the width of the single photovoltaic panel;

[0174] The calculation formula of the wind pressure force coefficient of the bending moment around the x-axis of the photovoltaic panel is:

[0175]

[0176] wherein is the wind pressure force coefficient of the bending moment around the x-axis of the photovoltaic panel, M x is the bending moment around the x-axis of the photovoltaic panel, y i is the i-th measuring point on the y-axis, L y is the length between the two connecting members in the y-axis direction;

[0177] The calculation formula of the wind pressure force coefficient of the bending moment around the y-axis of the photovoltaic panel is:

[0178]

[0179] wherein s,My is the wind pressure force coefficient of the bending moment around the y-axis of the photovoltaic panel, M y is the bending moment around the y-axis of the photovoltaic panel, x i is the i-th measuring point on the x-axis.

[0180] The fifth calculation module 700 is configured to calculate the normal wind force of the photovoltaic panel fixing block based on the wind pressure force coefficient of the normal wind force of the single photovoltaic panel, the wind pressure force coefficient of the bending moment around the x axis of the photovoltaic panel and the wind pressure force coefficient of the bending moment around the y axis of the photovoltaic panel. The photovoltaic panel fixing block is provided with four, and the calculation formula of the normal wind force of the four photovoltaic panel fixing blocks is as follows:

[0181]

[0182] wherein, F z,1 is the normal wind force of the first photovoltaic panel fixing block, F z,2 is the normal wind force of the second photovoltaic panel fixing block, F z,3 is the normal wind force of the third photovoltaic panel fixing block, F z,4 is the normal wind force of the fourth photovoltaic panel fixing block, F Z is the normal wind force of the single photovoltaic panel, M x is the bending moment around the x axis of the photovoltaic panel, M y is the bending moment around the y axis of the photovoltaic panel, μ z is the wind pressure height variation coefficient, w0 is the basic wind pressure, L is the length of the single photovoltaic panel, and B is the width of the single photovoltaic panel.

[0183] The sixth calculation module 800 is configured to calculate the stress of the photovoltaic panel connecting piece based on the normal wind force of the photovoltaic panel fixing block. The calculation formula of the stress of the photovoltaic panel connecting piece is as follows:

[0184]

[0185] wherein, σ k is the stress of the kth photovoltaic panel connecting piece, F z,k is the normal wind force of the kth photovoltaic panel fixing block, A U is the area of the photovoltaic panel connecting piece, d k is the diameter of the kth photovoltaic panel connecting piece, and [] is the average stress of the steel strength.

[0186] In response to the stress of the photovoltaic panel connecting piece being less than or equal to the average stress of the steel strength, the diameter of the photovoltaic panel connecting piece is obtained as follows:

[0187] In one embodiment, the first acquisition module 300 is further configured to acquire the total average wind pressure coefficient of each test time period of a single measuring point under a single wind direction angle;

[0188] Based on the total average wind pressure coefficient, the maximum wind pressure coefficient and the minimum wind pressure coefficient of each test time period of the single measuring point under the single wind direction angle are selected;

[0189] Obtain all maximum wind pressure coefficients and minimum wind pressure coefficients of each test point of the photovoltaic panel in each test time period under a single wind direction angle.

[0190] Obtain the average values of the maximum wind pressure coefficients and the minimum wind pressure coefficients respectively, and take the average values of the maximum wind pressure coefficients and the minimum wind pressure coefficients as the maximum wind pressure coefficients and the minimum wind pressure coefficients of a single test point under a single wind direction angle.

[0191] In one embodiment, the second obtaining module is further configured to obtain the wind load shape coefficient of the surface of the photovoltaic panel by using an unbiased estimation method based on the maximum wind pressure coefficients and the minimum wind pressure coefficients.

[0192] The device and method embodiments in the embodiments of the application are based on the same application concept.

[0193] Figure 5 The structure schematic diagram of an embodiment of the electronic device provided by the embodiments of the application is shown, and the specific implementation of the electronic device is not limited by the embodiments of the application.

[0194] As shown in Figure 5 The electronic device can include a processor 502, a communications interface 504, a memory 506, and a communications bus 508.

[0195] The processor 502, the communications interface 504, and the memory 506 can communicate with each other through the communications bus 508. The communications interface 504 is configured to communicate with network elements such as clients or other servers. The processor 502 is configured to execute the program 510, and specifically can execute the related steps in the method embodiments for calculating the stress of the photovoltaic module connector based on the wind tunnel test data.

[0196] Specifically, the program 510 can include program code including computer executable instructions.

[0197] The processor 502 can be a central processing unit CPU, or an application specific integrated circuit ASIC, or one or more integrated circuits configured to implement the embodiments of the application. The one or more processors of the electronic device can be the same type of processors, such as one or more CPUs; or can be different types of processors, such as one or more CPUs and one or more ASICs.

[0198] A memory 506, for storing the program 510. The memory 506 can include a high-speed RAM memory, and can also include a non-volatile memory, for example at least one disk memory.

[0199] The program 510 can specifically be called by the processor 502 to make the electronic device perform the related steps in the method embodiments of calculating the stress of the photovoltaic module connector based on the wind tunnel test data.

[0200] Those skilled in the art can understand that, Figure 5 The structure shown is only schematic, and does not limit the structure of the above-mentioned device. For example, the electronic device can also include more or fewer components than those shown, or have a different configuration from that shown. Figure 5 The structure shown is only schematic, and does not limit the structure of the above-mentioned device. For example, the electronic device can also include more or fewer components than those shown, or have a different configuration from that shown. Figure 5 The structure shown is only schematic, and does not limit the structure of the above-mentioned device. For example, the electronic device can also include more or fewer components than those shown, or have a different configuration from that shown.

[0201] The computer readable storage medium provided by the embodiments of the present application stores at least one executable instruction, which, when executed on the device for calculating the stress of the photovoltaic module connector based on the wind tunnel test data, causes the device for calculating the stress of the photovoltaic module connector based on the wind tunnel test data to perform the method of calculating the stress of the photovoltaic module connector based on the wind tunnel test data in any of the above method embodiments.

[0202] The algorithms or displays provided herein are not inherently related to any particular computer, virtual system, or other apparatus. Furthermore, embodiments of the present application are not described in relation to any particular programming language.

[0203] In the specification provided herein, a large number of specific details are described. However, it can be understood that the embodiments of the present application can be practiced without these specific details. Similarly, in order to simplify the present application and help understand one or more of the various inventive aspects, in the above description of the exemplary embodiments of the present application, various features of the embodiments of the present application are sometimes grouped together into a single embodiment, figure, or description thereof. Among them, the claims following the detailed description are hereby expressly incorporated into this detailed description, wherein each claim itself is a separate embodiment of the present application.

[0204] Those skilled in the art can understand that the modules in the device in the embodiments can be adaptively changed and arranged in one or more devices different from the embodiments. The modules or units or components in the embodiments can be combined into one module or unit or component, and in addition, they can be divided into multiple sub-modules or sub-units or sub-components. Except that at least some of such features and / or processes or units are mutually exclusive.

[0205] It should be noted that the above embodiments illustrate rather than limit the invention, and that alternative embodiments may be devised by a person skilled in the art without departing from the scope of the appended claims. In the claims, any reference signs placed between brackets should not be construed as limiting the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The present invention may be implemented by means of hardware comprising several different elements and by means of appropriately programmed computers. In a unit claim enumerating several means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third etc. does not indicate any order. These words may be interpreted as names. The steps in the above embodiments should not be understood as limiting the order of execution unless otherwise specified.

Claims

1. A method for calculating the stress of photovoltaic module connectors based on wind tunnel test data, wherein the photovoltaic module includes a photovoltaic panel, a photovoltaic panel fixing block, and a photovoltaic panel connector; It is characterized by: The method comprises: Calculating the wind pressure coefficient at each measuring point on the photovoltaic panel surface based on the wind tunnel test data, and calculating the average wind pressure coefficient at each measuring point on the photovoltaic panel surface; Calculating the standard deviation of the wind pressure coefficient at each measuring point on the surface of the photovoltaic panel based on the average wind pressure coefficient; Based on the average wind pressure coefficient and the standard deviation of the wind pressure coefficient, obtaining the maximum wind pressure coefficient and the minimum wind pressure coefficient of each measuring point of the photovoltaic panel at different wind direction angles; Obtaining a wind load shape coefficient on the surface of the photovoltaic panel based on the maximum wind pressure coefficient and the minimum wind pressure coefficient; Calculating the normal wind force of a single photovoltaic panel, the bending moment around the x-axis of the photovoltaic panel, and the bending moment around the y-axis of the photovoltaic panel based on the wind load shape coefficient; Calculate the wind pressure coefficient of the normal wind resultant force of the single photovoltaic panel, the wind pressure coefficient of the bending moment around the x-axis of the photovoltaic panel, and the wind pressure coefficient of the bending moment around the y-axis of the photovoltaic panel based on the normal wind resultant force of the single photovoltaic panel, the bending moment around the x-axis of the photovoltaic panel, and the bending moment around the y-axis of the photovoltaic panel; Calculating the normal wind resultant force of the photovoltaic panel fixing block based on the wind pressure coefficient of the normal wind resultant force of the single photovoltaic panel, the wind pressure coefficient of the bending moment around the photovoltaic panel x-axis, and the wind pressure coefficient of the bending moment around the photovoltaic panel y-axis; Calculating the stress of the photovoltaic panel connector based on the normal wind force of the photovoltaic panel fixing block; The calculating of the wind pressure coefficient at each measuring point on the photovoltaic panel surface based on the wind tunnel test data, and the calculating of the average wind pressure coefficient at each measuring point on the photovoltaic panel surface, include: The calculation formula for calculating the wind pressure coefficient at each measuring point on the photovoltaic panel surface is: in, is the wind pressure coefficient of the ith measuring point of the photovoltaic panel, is the net wind pressure at the ith measuring point of the photovoltaic panel, is the static pressure at the reference point, is the total pressure at the reference point; The calculation formula for calculating the average wind pressure coefficient at each measuring point on the photovoltaic panel surface is: in, is the average wind pressure coefficient of each measuring point on the photovoltaic panel surface, t is the wind pressure test duration, and N is the total number of wind pressure coefficients at each measuring point on the photovoltaic panel surface; Calculating the standard deviation of the wind pressure coefficient at each measuring point on the photovoltaic panel surface based on the average wind pressure coefficient includes: The calculation formula for calculating the standard deviation of the wind pressure coefficient at each measuring point on the photovoltaic panel surface is: in, is the standard deviation of wind pressure coefficient, is the wind pressure coefficient of the ith measuring point of the photovoltaic panel, is the average wind pressure coefficient of each measuring point on the surface of the photovoltaic panel, t is the wind pressure test duration, and N is the total number of wind pressure coefficients at each measuring point on the surface of the photovoltaic panel.

2. The method for calculating the stress of photovoltaic module connectors based on wind tunnel test data according to claim 1, characterized in that: The step of obtaining the maximum wind pressure coefficient and the minimum wind pressure coefficient at each measuring point of the photovoltaic panel at different wind directions based on the average wind pressure coefficient and the standard deviation of the wind pressure coefficient includes: Obtain the total average wind pressure coefficient of a single measuring point in each test period under a single wind direction angle; Based on the total average wind pressure coefficient, selecting the maximum wind pressure coefficient and the minimum wind pressure coefficient of the single measuring point in each test time period under the single wind direction angle; Obtaining all maximum wind pressure coefficients and minimum wind pressure coefficients at each measuring point of the photovoltaic panel within each test time period under the single wind direction angle; The average values ​​of the maximum wind pressure coefficient and the minimum wind pressure coefficient are respectively obtained, and the average values ​​of the maximum wind pressure coefficient and the minimum wind pressure coefficient are used as the maximum wind pressure coefficient and the minimum wind pressure coefficient of the single measuring point under the single wind direction angle.

3. The method for calculating the stress of photovoltaic module connectors based on wind tunnel test data according to claim 1, characterized in that: The step of obtaining the wind load shape coefficient on the photovoltaic panel surface based on the maximum wind pressure coefficient and the minimum wind pressure coefficient includes: Based on the maximum wind pressure coefficient and the minimum wind pressure coefficient, an unbiased estimation method is used to obtain the wind load shape coefficient on the surface of the photovoltaic panel.

4. The method for calculating the stress of photovoltaic module connectors based on wind tunnel test data according to claim 1, characterized in that: The calculation of the normal wind resultant force of a single photovoltaic panel, the bending moment around the x-axis of the photovoltaic panel, and the bending moment around the y-axis of the photovoltaic panel based on the wind load shape coefficient includes: The calculation formula for calculating the normal wind force of a single photovoltaic panel is: in, is the normal wind force of a single photovoltaic panel, is the wind vibration coefficient of each pressure measuring point, is the wind load action area borne by each pressure measuring point, is the wind pressure coefficient of the ith measuring point of the photovoltaic panel, is the wind pressure height variation coefficient, is the basic wind pressure, There are n pressure measuring points on each photovoltaic panel; The calculation formula for calculating the bending moment around the x-axis of the photovoltaic panel is: in, is the bending moment around the x-axis of the photovoltaic panel, is the i-th pressure measuring point on the y-axis; The calculation formula for calculating the bending moment around the y-axis of the photovoltaic panel is: in, Bending moment around the y-axis of the photovoltaic panel, is the i-th pressure measuring point on the x-axis.

5. The method for calculating the stress of photovoltaic module connectors based on wind tunnel test data according to claim 1, characterized in that: The calculating, based on the normal wind resultant force of the single photovoltaic panel, the bending moment around the x-axis of the photovoltaic panel, and the bending moment around the y-axis of the photovoltaic panel, the wind pressure coefficient of the normal wind resultant force of the single photovoltaic panel, the wind pressure coefficient of the bending moment around the x-axis of the photovoltaic panel, and the wind pressure coefficient of the bending moment around the y-axis of the photovoltaic panel, comprises: The calculation formula of the wind pressure coefficient of the normal wind resultant force of a single photovoltaic panel is: in, is the wind pressure coefficient of the normal wind force of a single photovoltaic panel, is the normal wind force of a single photovoltaic panel, is the wind vibration coefficient of each pressure measuring point, is the wind load action area borne by each pressure measuring point, is the wind pressure coefficient of the ith measuring point of the photovoltaic panel, is the wind pressure height variation coefficient, is the basic wind pressure, There are n pressure measuring points on each photovoltaic panel. is the length of a single photovoltaic panel, is the width of a single photovoltaic panel; The calculation formula of the wind pressure coefficient of the bending moment around the x-axis of the photovoltaic panel is: in, is the wind pressure coefficient of the bending moment around the x-axis of the photovoltaic panel, is the bending moment around the x-axis of the photovoltaic panel, is the i-th pressure measuring point on the y-axis, is the length between the two connectors in the y-axis direction; The calculation formula of the wind pressure coefficient of the bending moment around the y-axis of the photovoltaic panel is: in, is the wind pressure coefficient of the bending moment around the y-axis of the photovoltaic panel, Bending moment around the y-axis of the photovoltaic panel, is the i-th pressure measuring point on the x-axis.

6. The method for calculating the stress of photovoltaic module connectors based on wind tunnel test data according to claim 1, characterized in that: The calculating of the normal wind resultant force of the photovoltaic panel fixing block based on the wind pressure coefficient of the normal wind resultant force of the single photovoltaic panel, the wind pressure coefficient of the bending moment around the photovoltaic panel x-axis, and the wind pressure coefficient of the bending moment around the photovoltaic panel y-axis includes: There are four photovoltaic panel fixing blocks, and the calculation formula for calculating the normal wind resultant force of the four photovoltaic panel fixing blocks is: in, is the normal wind force of the first photovoltaic panel fixed block, is the normal wind force on the second photovoltaic panel fixed block, is the normal wind force of the third photovoltaic panel fixed block, is the normal wind force of the fourth photovoltaic panel fixed block, is the normal wind force of a single photovoltaic panel, is the bending moment around the x-axis of the photovoltaic panel, Bending moment around the y-axis of the photovoltaic panel, is the wind pressure height variation coefficient, is the basic wind pressure, is the length of a single photovoltaic panel, is the width of a single photovoltaic panel.

7. The method for calculating the stress of photovoltaic module connectors based on wind tunnel test data according to claim 1, characterized in that: The calculating of the stress of the photovoltaic panel connector based on the normal wind resultant force of the photovoltaic panel fixing block includes: The calculation formula for calculating the stress of the photovoltaic panel connector is: in, is the stress of the kth photovoltaic panel connector, is the normal wind force on the k-th photovoltaic panel fixed block, is the area of ​​the photovoltaic panel connector, is the diameter of the kth photovoltaic panel connector, is the average stress of steel strength; In response to the stress of the photovoltaic panel connector being less than or equal to the average stress of the steel strength, the diameter of the photovoltaic panel connector is obtained as: .

8. A device for calculating the stress of photovoltaic module connectors based on wind tunnel test data, characterized in that: The device comprises: A first calculation module is used to calculate the wind pressure coefficient of each measuring point on the surface of the photovoltaic panel based on the wind tunnel test data, and calculate the average wind pressure coefficient of each measuring point on the surface of the photovoltaic panel; A second calculation module is used to calculate the standard deviation of the wind pressure coefficient of each measuring point on the surface of the photovoltaic panel based on the average wind pressure coefficient; A first acquisition module is configured to acquire, based on the average wind pressure coefficient and the standard deviation of the wind pressure coefficient, the maximum wind pressure coefficient and the minimum wind pressure coefficient of each measuring point of the photovoltaic panel at different wind directions; A second acquisition module is configured to obtain a wind load shape coefficient on the surface of the photovoltaic panel based on the maximum wind pressure coefficient and the minimum wind pressure coefficient; A third calculation module is used to calculate the normal wind force of a single photovoltaic panel, the bending moment around the x-axis of the photovoltaic panel, and the bending moment around the y-axis of the photovoltaic panel based on the wind load body shape coefficient; a fourth calculation module, configured to calculate a wind pressure coefficient of the normal wind resultant force of the single photovoltaic panel, a wind pressure coefficient of the bending moment around the x-axis of the photovoltaic panel, and a wind pressure coefficient of the bending moment around the y-axis of the photovoltaic panel based on the normal wind resultant force of the single photovoltaic panel, the bending moment around the x-axis of the photovoltaic panel, and the bending moment around the y-axis of the photovoltaic panel; a fifth calculation module, configured to calculate the normal wind resultant force of the photovoltaic panel fixing block based on the wind pressure coefficient of the normal wind resultant force of the single photovoltaic panel, the wind pressure coefficient of the bending moment around the photovoltaic panel x-axis, and the wind pressure coefficient of the bending moment around the photovoltaic panel y-axis; The sixth calculation module is used to calculate the stress of the photovoltaic panel connector based on the normal wind force of the photovoltaic panel fixing block.

Images