A multi-point drive photovoltaic tracking system and design method

Abstract

The present application belongs to the field of photovoltaic technology, and provides a kind of multi-point drive photovoltaic tracking system and design method, its method includes: the driving device close to the outer end of main shaft is segmented towards the outer end of main shaft of the main shaft, and the main shaft between two driving devices is segmented, to obtain the position of multiple preset segments;The torsion angle of the preset segment between driving device and the end of main shaft, and between adjacent two driving devices is calculated;According to the position of multiple preset segments, the main shaft and column model of multi-point drive photovoltaic tracking support is established, after inputting model parameters, the torsion angle corresponding to each preset segment, load parameter, finite element analysis is carried out, and stress ratio and support reaction force parameter are obtained.The present application proposes a kind of automatic modeling method for mechanical analysis of multi-point drive photovoltaic tracking system, generates stress ratio chart, support reaction force, calculation book and other files based on finite element analysis results, for quickly designing multi-point drive photovoltaic tracking support.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of photovoltaic technology, in particular to a multi-point driving photovoltaic tracking system and a design method. BACKGROUND

[0002] In the calculation of the multi-point driving photovoltaic flat single-axis tracking support, since there are multiple driving points in the same group of supports, the cross sections of the main shaft between the adjacent two driving points are different, which makes it difficult to determine the critical point of the moment distribution. If only the midpoint is taken, the material of the part of the main shaft with thicker thickness is redundant, which is not conducive to cost reduction, and the part of the main shaft with thinner thickness will cause hidden dangers to the project safety due to insufficient material. Engineers have a large number of projects to calculate, draw overall assembly drawings, and issue calculation books and material lists every day. If there is no calculation tool for the multi-point driving photovoltaic flat single-axis tracking support, it will lead to a large amount of work and project accumulation, and customers cannot obtain the design scheme in time.

[0003] Currently, there is no software method for automatically modeling and generating stress ratio and support reaction force charts in the mechanical calculation process of the multi-point driving tracking support in the industry. Currently, the industry usually directly calculates the whole according to the specifications and formulas, or manually establishes each model and applies loads in the finite element analysis software, which is relatively slow and cannot guarantee the modeling accuracy, which has safety hazards. SUMMARY

[0004] To solve the above problems, the present application provides a multi-point driving photovoltaic tracking system and a design method.

[0005] In order to achieve the above purposes of the present application, the present application is realized by the following technology:

[0006] On the one hand, the present application provides a multi-point driving photovoltaic tracking support design method, the photovoltaic tracking support is used for supporting photovoltaic modules, the photovoltaic tracking support includes a plurality of columns, purlins, a main shaft and a single driving device, the main shaft is installed at the top of the plurality of columns, the driving device is used for driving the main shaft to rotate, and the design method comprises:

[0007] segmenting the driving device close to the outer end of the main shaft towards the outer end of the main shaft, and segmenting the main shaft between the two driving devices to obtain the positions of a plurality of preset segments;

[0008] calculating the torsion angle of the preset segment between the driving device and the end of the main shaft, and between the adjacent two driving devices;

[0009] calculating the load parameter of each preset segment;

[0010] According to the positions of the plurality of preset segments, a model of the main shaft and the column of the multi-point driving photovoltaic tracking support is established, and after inputting model parameters, a torsion angle corresponding to each preset segment, and load parameters, finite element analysis is performed to obtain stress ratio and support reaction force parameters.

[0011] In some embodiments, further comprising:

[0012] The preset segment located between the two driving devices is twisted by a torsion angle relative to the main shaft from which the two driving devices are located, and when the torsion angles on both sides are equal, the position of the main shaft corresponds to the critical position of the preset segment located between the two driving devices.

[0013] In some embodiments, the calculation of the torsion angle of each preset segment between the driving device and the end of the main shaft further comprises:

[0014] If the preset segment is located between the driving device and the single side of the main shaft, the torsion angle of the preset segment is obtained by accumulating and superimposing the torque from the driving device to the outer end of the main shaft;

[0015] If the preset segment is located between the two driving devices, the torsion angle of the preset segment is obtained by accumulating and superimposing the torque from the driving device to the critical position.

[0016] In some embodiments, the formula for calculating the torque is:

[0017] T=q*C 2 *Li*GCM M&D ;

[0018] T sum =T+T next ;

[0019] Wherein, T sum is the actual torque after accumulation; T is the torque of the current preset segment main shaft; T next is the torque of the next segment of the current preset segment main shaft; q is the wind pressure, unit Pa; C is the component height; Li is the length of the current preset segment; GCM M&D is the torque coefficient.

[0020] In some embodiments, the formula for calculating the torsion angle is:

[0021]

[0022] θ i =θ sum +Δθ i

[0023] Wherein, θ sumis the cumulative torsion angle of the previous segment; Δθ i is the torsion angle added to the current preset segment; θ i is the actual torsion angle of the current preset segment; G is the constant load parameter, with units of N / mm 2 ; J is the Saint-Venant constant of the current preset segment, with units of mm 4 .

[0024] In some embodiments, the positions of the plurality of preset segments obtained by segmenting the driving device close to the outer end of the main shaft towards the outer end of the main shaft and segmenting the main shaft between two driving devices include:

[0025] The wind tunnel test data corresponding to the position of the column is correspondingly divided into a plurality of position points;

[0026] The plurality of position points include the position points of the driving device, the position points of the main shaft connector, and the position points of the column. The position points of the driving device, the position points of the main shaft connector, the plurality of position points of the column, and the critical position points are all initial position points for segmenting the main shaft. The plurality of preset segment positions can be obtained by de-duplicating and sorting the initial position points.

[0027] In some embodiments, before the positions of the plurality of preset segments obtained by segmenting the driving device close to the outer end of the main shaft towards the outer end of the main shaft and segmenting the main shaft between two driving devices, the method further includes:

[0028] Based on the size information of the photovoltaic module, the position of each photovoltaic module and the position of the purlin are calculated;

[0029] The chord length and total length of the photovoltaic tracking support are automatically calculated in combination with the number of photovoltaic module strings required by the target project.

[0030] By setting the maximum span and the maximum single main shaft length of the photovoltaic tracking support, the dimensions of the outer periphery, the inner periphery, and the deep inner periphery between the photovoltaic tracking supports are obtained.

[0031] In some embodiments, the calculation of the load parameter of each preset segment includes:

[0032] Based on the weight data of the photovoltaic module, the constant load of the main shaft in each preset segment is calculated.

[0033] Based on the basic snow pressure, chord length, and inclination angle of the photovoltaic tracking support, the snow load of the main shaft in each preset segment is calculated.

[0034] Based on the wind pressure, chord length, and wind tunnel test data of the photovoltaic tracking support, the wind load of the main shaft in each preset segment is calculated.

[0035] In some embodiments, further comprising:

[0036] Based on the stress ratio and support reaction force of the photovoltaic tracking support, a corresponding stress ratio chart and support reaction force table are generated to design the photovoltaic tracking support.

[0037] In some embodiments, a multi-point driving photovoltaic tracking system comprises: a multi-point driving photovoltaic tracking system generated by the multi-point driving photovoltaic tracking system design method.

[0038] The multi-point driving photovoltaic tracking system and the design method provided by the application have at least the following beneficial effects:

[0039] The application provides a multi-point driving photovoltaic tracking system mechanical analysis automatic modeling method, generates stress ratio charts, support reaction forces, calculation books and other files based on finite element analysis results, and is used for quickly designing a multi-point driving photovoltaic tracking support. BRIEF DESCRIPTION OF DRAWINGS

[0040] The above-mentioned characteristics, technical features, advantages and implementation modes of the multi-point driving photovoltaic tracking system and the design method will be further described in the following preferred embodiments in a clear and understandable manner combined with the drawings.

[0041] Figure 1 is a schematic diagram of an embodiment of a multi-point driving photovoltaic tracking system design method in the application;

[0042] Figure 2 is a schematic diagram of several stress intervals of a tracking support in the application;

[0043] Figure 3 is a schematic diagram of wind tunnel data partition in the application;

[0044] Figure 4 is a critical point position diagram in the application;

[0045] Figure 5 is a schematic diagram of a main shaft connecting piece position in the application;

[0046] Figure 6 is a schematic diagram of a torsion angle calculation in the application;

[0047] Figure 7 is a schematic diagram of size information of an assembly and a purlin in the application;

[0048] Figure 8 is a schematic diagram of size data of each area in the application;

[0049] Figure 9 is a schematic diagram of main sizes in the application;

[0050] Figure 10 Fig. 1 is a schematic diagram of the color label of the cross section of the main shaft and column in the present application;

[0051] Figure 11 Fig. 2 is a schematic diagram of the Sap2000 file of each zone generated in the present application;

[0052] Figure 12 Fig. 3 is a schematic diagram of the 6 groups of models of each zone in the present application;

[0053] Figure 13 Fig. 4 is a schematic diagram of the analyzed model in the present application;

[0054] Figure 14 Fig. 5 is a schematic diagram of the stress ratio of the main shaft and column in the present application;

[0055] Figure 15 Fig. 6 is a schematic diagram of the support reaction table in the present application. DETAILED DESCRIPTION

[0056] In the following description, for the purposes of explanation and not limitation, specific details are set forth, such as particular system configurations, techniques, etc. in order to provide a thorough understanding of the embodiments described. However, it will be apparent to those skilled in the art that the application can be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the application with unnecessary detail.

[0057] It should be understood that the term "comprising" when used in this specification and the appended claims, specifies the presence of stated features, integers, steps, operations, elements, and / or components, but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0058] In order to make the drawing simple, only the parts related to the present application are shown in each drawing, and they do not represent the actual structure of the product. In addition, in order to make the drawing simple and easy to understand, in some drawings, only one of the parts with the same structure or function is shown schematically, or only one of them is marked. In this text, "one" not only means "only one", but also means "more than one" situation.

[0059] It should be further understood that the term "and / or" used in the present application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes these combinations.

[0060] In addition, in the description of the present application, the terms "first", "second", etc. are only used for differentiation in description, and cannot be understood as indicating or implying relative importance.

[0061] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, specific implementations of the present application will be described below with reference to the drawings. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained from these drawings without creative effort, and other embodiments can also be obtained.

[0062] In one embodiment, as shown in Figure 1 The present application provides an embodiment of a design method of a multi-point driving photovoltaic tracking system, the photovoltaic tracking support is used for supporting a photovoltaic module, the photovoltaic tracking support comprises a plurality of columns, purlins, a main shaft and a plurality of driving devices, the main shaft is installed at the top of the plurality of columns, and the driving device is used for driving the main shaft to rotate. In this embodiment, the driving device is a rotary driver, and the design method comprises:

[0063] S101 segmenting the driving device close to the outer end of the main shaft towards the outer end of the main shaft, and segmenting the main shaft between two driving devices to obtain the positions of a plurality of preset segments.

[0064] In this embodiment, the main shaft is segmented based on the separation mode of the wind tunnel test corresponding to the positions of the main shaft and the columns to obtain the positions of a plurality of preset segments.

[0065] The main shaft comprises a plurality of main shaft segments connected in series, and the outer end of the main shaft refers to the free end of the outermost edge in the axial direction.

[0066] For example, the main shaft is segmented for modeling according to the separation mode of the wind tunnel test data corresponding to different positions of the main shaft and the columns in the photovoltaic tracking support.

[0067] First, the entire photovoltaic tracking support is divided into N+1 parts according to the number N of driving columns, as shown in Figure 2 In the support shown in the figure, there are 11 columns, of which 3 columns are driving columns, and the support is divided into 4 stress intervals according to the driving columns.

[0068] Then, each span is divided into 3 segments according to the wind tunnel test data of the main shaft, as shown in Figure 3 Each segment corresponds to corresponding wind tunnel data. Since the length of each span is too long after being divided into 3 segments, each segment is further divided into 3 small segments, i.e. 9 small points between each span, and the start position of each small segment is written into an array Array1.

[0069] S102 calculating the torsion angle of the preset segment between the driving device and the end of the main shaft, and between two adjacent driving devices.

[0070] S103 calculates a load parameter of each of the preset segments.

[0071] S104, according to positions of the preset segments, establishes the main shaft and column model of the multi-point driving photovoltaic tracking support, inputs model parameters, a torsion angle corresponding to each preset segment, the load parameter, and then performs finite element analysis to obtain a stress ratio and a support reaction force parameter.

[0072] In the embodiment, the main shaft and column model of different sections at different positions in a group of photovoltaic tracking supports are quickly established into a finite element analysis software in an automatic modeling manner, and each part is automatically subjected to load and then analyzed, which is more accurate than a traditional separate calculation manner through specifications and formulas.

[0073] Currently, there is no applicable software method for automatically modeling and generating stress ratio, support reaction force and other charts in the mechanical calculation process of the multi-point driving photovoltaic tracking support.

[0074] The application provides a multi-point driving photovoltaic tracking system mechanical analysis automatic modeling method, generates stress ratio charts, support reaction forces, calculation books and other files based on finite element analysis results, and is used for quickly designing the multi-point driving photovoltaic tracking support.

[0075] In one embodiment, the calculation of the torsion angle of each preset segment between the driving device and the end of the main shaft further comprises:

[0076] If the preset segment is located between the driving device and one side of the main shaft, the torsion angle of the preset segment is obtained by accumulating and superimposing the torque from the driving device to the outer end of the main shaft.

[0077] If the preset segment is located between two driving devices, the torsion angle of the preset segment is obtained by accumulating and superimposing the torque from the driving device to the critical position.

[0078] In the embodiment, Figure 2 of the four parts, the two ends of interval 2 and interval 3 are driving columns, and the load thereon is transmitted to the two ends of the driving, and the critical point of the torsion angle needs to be calculated, the load to the left of the critical point is transmitted to the left end of the driving, and the load to the right of the critical point is transmitted to the right end of the driving, as shown in Figure 4 .

[0079] The main shaft in the interval is divided into 100000 parts and stored in an array, and the main shaft section torsional stiffness J and wind tunnel coefficient GC corresponding to the position are stored in the array. MThe torque T of the current preset section of the main shaft is calculated segment by segment from the driving column at the left end of the section, and then the torque T is accumulated segment by segment from the last section of the main shaft to obtain the increased torsion angle of the current preset section, which is superimposed with the accumulated torsion angle of the previous section to obtain the actual torsion angle of the current preset section, and finally 100000 angle data θ1 from the driving column at the left end of the section are obtained.

[0080] Similarly, the torque T of the current preset section of the main shaft is calculated segment by segment from the driving column at the right end of the section, and then the torque T is accumulated segment by segment from the last section of the main shaft to obtain the increased torsion angle of the current preset section, which is superimposed with the accumulated torsion angle of the previous section to obtain the actual torsion angle of the current preset section, and finally 100000 angle data θ2 from the driving column at the left end of the section are obtained.

[0081] The critical points between all the rotary columns are calculated in the same way, and the positions of the two critical points are added to the array Array1.

[0082] Then the positions of all the main shaft connectors are added to the array Array1, as shown by the main shaft connector positions 2, 3 and 4 in Figure 5

[0083] At this point, the array Array1 contains all the required segment positions, which are sorted from left to right and compared with the positions of the actual main shaft used in the project to obtain the cross-sectional properties and materials of each small section of the main shaft for modeling analysis, and the corresponding wind tunnel test data coefficients GC M and GC N .

[0084] Then the iteration calculation is performed from the column where the driving device is located to both sides, the torque T of the current preset section of the main shaft is calculated segment by segment (formula 1), and then the torque T is accumulated segment by segment from the last section of the main shaft (formula 2) to obtain the increased torsion angle of the current preset section (formula 3), which is superimposed with the accumulated torsion angle of the previous section to obtain the actual torsion angle of the current preset section (formula 4).

[0085] The leftmost column where the driving device is located (such as point 2 in Figure 6 is iterated to the leftmost end of the entire support (such as point 1 in Figure 6 and to the right to the critical point between the column where the next driving device is located (such as point 3 in Figure 6 corresponding to the critical point A in Figure 4 Similarly, the rightmost column where the driving device is located (such as point 6 in Figure 6 is iterated to the rightmost end of the entire support, and to the left to the critical point between the column where the adjacent driving device is located on the left (such as point 5 in Figure 6 corresponding to the critical point B in Figure 4 The columns where the driving devices are located in the middle (such as​Figure 6 Point 4) in FIG. 1 is iterated to the critical points on the left and right sides (such as points 3 and 5 in FIG. 1) respectively. Figure 6

[0086] In this embodiment, for the multi-point driving photovoltaic tracking support, the torsion angle of the preset section is calculated in sequence with the column where the driving device is located as the center.

[0087] In one embodiment, it further comprises: the preset section between the two driving devices, and the torsion angle is superimposed relatively from the main shaft where the two driving devices are located as the starting point, and when the torsion angles on both sides are equal, the position corresponding to the main shaft is the critical position of the preset section between the two driving devices.

[0088] In this embodiment, the critical point position calculation method and formula are as follows:

[0089] Formula 1: T = q * C 2 * Li * GCM M&D

[0090] Formula 2: T sum = T + T next

[0091] Formula 3:

[0092] Formula 4: θ i = θ sum + Δθ i

[0093] From the angle value (0 degrees at the beginning) of the serial number 1 of θ1, compared with the angle value (i.e. the angle corresponding to θ2 at the same position) of (10000-serial number) in θ2, when the value in θ1 is greater than the value in θ2, it means that the critical point of the same torsion angle is reached, and the specific position of the small section according to the serial number is the critical point.

[0094] In the same way, the critical points between all the rotary columns are calculated, and the positions of the two critical points are added to the array Array1.

[0095] In one embodiment, the formula for calculating the torque is:

[0096] T = q * C 2 * Li * GCM M&D ;

[0097] T sum = T + T next ;

[0098] Wherein, T sum is the actual torque after accumulation; T is the torque of the current preset section main shaft; T​next is the torque of the next segment of the main shaft of the current preset segment; q is the wind pressure, in Pa; C is the height of the assembly; Li is the length of the current preset segment; GCM M&D is the torque coefficient.

[0099] In one embodiment, the formula for calculating the torsion angle is:

[0100]

[0101] θ i = θ sum + Δθ i

[0102] wherein θ sum is the cumulative torsion angle of the previous segment; Δθ i is the torsion angle added by the current preset segment; θ i is the actual torsion angle of the current preset segment; G is the constant load parameter, in N / mm 2 ; J is the Saint-Venant constant of the current preset segment, in mm 4 .

[0103] In one embodiment, the positions of the plurality of preset segments obtained by segmenting the main shaft near the outer end of the main shaft towards the outer end of the main shaft and segmenting the main shaft between two driving devices include:

[0104] corresponding wind tunnel test data of the column position are divided into a plurality of position points;

[0105] The plurality of position points include the position points of the driving devices, the position points of the main shaft connectors, and the position points of the columns. The position points of the driving devices, the position points of the main shaft connectors, the plurality of position points of the columns, and the critical position points are all initial position points for segmenting the main shaft. The initial position points can be de-duplicated and sorted to obtain the positions of the plurality of preset segments.

[0106] In one embodiment, before the positions of the plurality of preset segments are obtained by segmenting the main shaft near the outer end of the main shaft towards the outer end of the main shaft and segmenting the main shaft between two driving devices, the method further includes:

[0107] Based on the size information of the photovoltaic assembly, the position of each photovoltaic assembly and the position of the purlin are calculated;

[0108] The chord length and the total length of the photovoltaic tracking support are automatically calculated in combination with the number of strings of photovoltaic assemblies required by the target project.

[0109] By setting the maximum span and the maximum single main shaft length of the photovoltaic tracking support, the sizes of the periphery, the inner periphery and the deep inner periphery between the photovoltaic tracking are obtained.

[0110] The size of the periphery includes the position of each photovoltaic component, the position of the purlin, the length of the main shaft, the position of the main shaft, the position of the column and the span of the column.

[0111] In one embodiment, the load parameters of each of the preset segments are calculated, including:

[0112] Based on the weight data of the photovoltaic component, the dead load of the main shaft in each preset segment is calculated.

[0113] Based on the basic snow pressure, chord length and inclination angle of the photovoltaic tracking support, the snow load of the main shaft in each preset segment is calculated.

[0114] Based on the wind pressure, chord length and wind tunnel test data of the photovoltaic tracking support, the wind load of the main shaft in each preset segment is calculated.

[0115] In this embodiment, the load parameters of each of the preset segments are calculated, including:

[0116] Based on the weight data of the photovoltaic component, the dead load of the main shaft in each preset segment is calculated, and the formula is as follows:

[0117]

[0118] Wherein: W is the weight of the photovoltaic component; g is the acceleration of gravity; n v is the number of single-row photovoltaic components; α is the angle value of the inclination angle; for conversion to radian value; Pi is the circular constant.

[0119] In this embodiment, the load parameters of each of the preset segments are calculated, including:

[0120] Based on the basic snow pressure, chord length and inclination angle of the photovoltaic tracking support, the snow load of the main shaft in each preset segment is calculated, and the formula is as follows:

[0121] S=q s *L*(-0.018*α+1.273) / 1000

[0122] Wherein: q s is the basic snow pressure; L is the chord length; α is the inclination angle, and (-0.018*α+1.273) is equal to 1 when α≤15°.

[0123] In this embodiment, the load parameters of each of the preset segments are calculated, including:

[0124] Based on the wind pressure, chord length and wind tunnel test data of the photovoltaic tracking support, the wind load of the main shaft in each preset segment is calculated, and the formula is as follows:

[0125] Pressure: W n = GC N *L*q / 1000

[0126] Torque: W v = GC M *L 2 *q

[0127] Wherein: GC N is the pressure coefficient corresponding to the current preset segment in the wind tunnel test data; GC M is the torque coefficient corresponding to the current preset segment in the wind tunnel test data; L is the chord length; q is the wind pressure under US2005 specification.

[0128] In the embodiment, the application automatically calculates the load to be applied to the first subdivided segment based on the wind tunnel test data and the section parameters of each component of the support. The model is automatically established and the load is applied in Sap2000, calculation analysis is performed, and stress ratio and support reaction force and other data are extracted, so that the mechanical analysis work is automated and graphical.

[0129] Specifically, after obtaining the constant load, snow load and wind load of each segment, through the corresponding interface of the Sap2000 mechanical analysis software, a model is established in Sap2000 according to the position, direction, section, material and other information of the main shaft and the column of each part, and the constant load, snow load and wind load are applied on the main shaft according to the torsion angle of each segment. Then the analysis is started, and according to the position of each value in the table in the analyzed file, the stress ratio and support reaction force and other data are taken to form intuitive stress ratio chart and support reaction force table, which is convenient for engineers to check.

[0130] In one embodiment, it further comprises:

[0131] Based on the stress ratio and support reaction force of the photovoltaic tracking support, the corresponding stress ratio chart and support reaction force table are generated to design the photovoltaic tracking support.

[0132] In the embodiment, according to the basic information such as the size of the photovoltaic module input by the engineer, the calculation is automatically performed, and the project model is generated by avoiding interference. The engineer further sets according to the generated visual model. After the setting is completed, the SAP2000 mechanical analysis model and report, bill of materials, overall assembly drawing can be directly generated by one key, the time is shortened from 4-5 hours to 5 minutes, the segmented precision is improved from more than 800mm to within 1mm, and the analysis is completed. The stress ratio, support reaction force and other information are automatically extracted to generate charts to intuitively display the calculation results. While ensuring the accuracy of the results, the calculation efficiency is greatly improved.

[0133] In one embodiment, the present application also provides a multi-point driving photovoltaic tracking system, comprising: a multi-point driving photovoltaic tracking system generated by the multi-point driving photovoltaic tracking system design method.

[0134] In one embodiment, the present application also provides a multi-point driving photovoltaic tracking system design method, comprising:

[0135] Step 1, obtaining photovoltaic tracking support related size information according to project basic information. According to the photovoltaic module size shown in Figure 7 , and the hole position of the selected purlin, the spacing of the adjacent two photovoltaic modules can be calculated, so as to obtain the accurate position of each photovoltaic module and purlin. Combined with the required number of strings of the project, the chord length C (total vertical height) and the total length L of the support can be automatically calculated. t .

[0136] Then, by setting the maximum span and the maximum length of a single main shaft, the main size diagram of the corner, the periphery, the inner periphery, and the deep inner periphery is obtained as shown in Figure 8 .

[0137] Which mainly includes:

[0138] ① The position of each photovoltaic module, as shown in the uppermost block in Figure 9 , for example, the numbers 42-48 are a photovoltaic module, and the numbers 49-55 are a photovoltaic module;

[0139] ② The position of all purlins, as shown by the black squares below the photovoltaic modules in Figure 9 ;

[0140] ③ The length and position of all main shafts, as shown by the horizontal rectangles below the purlins in Figure 9 , for example, the numbers 7900, 7950, 9150, 9077, and 9558, wherein different colors correspond to the main shaft cross sections corresponding to the color labels shown in Figure 10 ; for example, the main shaft corresponding to the number 7900 corresponds to the main shaft cross section PT145*2.0-Q500, and the main shaft corresponding to the number 7950 corresponds to the main shaft cross section PT145*2.5-Q500.

[0141] ④ The position and span of all columns, as shown by the vertical rectangles in Figure 9 , wherein different colors correspond to the column cross sections corresponding to the color labels shown in Figure 10 ; for example, the column cross sections at 89%, 85%, 83%, 161%, and 104% are C150*100*15*2.5-Q500.

[0142] Step 2, obtaining the cross section and position of all subdivided small main shafts. As shown inFigure 5 After all the sub-segment positions are obtained, the sub-segment cross-section properties are obtained by comparing the sub-segment positions with the actual principal axis positions. Figure 9 The sub-segment division makes the subsequent mechanical analysis more accurate.

[0143] Step 3: Obtain the required load and direction to be applied on the principal axis of all the sub-segments. According to the snow and wind pressure of the project, the self-weight of the components and supports, and the wind tunnel data, the required load and direction to be applied on all the sub-segments are calculated.

[0144] Step 4: Input all the size and load information into Sap2000 and establish the model. Use the AddByCoord method of Sap2000 to draw the model in Sap2000 according to the three-dimensional coordinates of the start and end points of each sub-segment and the cross-section name. The parameters in this method are AddByCoord (start point X-axis coordinate, start point Y-axis coordinate, start point Z-axis coordinate, end point X-axis coordinate, end point Y-axis coordinate, end point Z-axis coordinate, start point X-axis coordinate, return the serial number in the current model, and the current preset segment cross-section name). All the parameters have been obtained in step 2. After setting the release, stiffness and rotation angle of the principal axis and the column through relevant methods, the model is completed. Since the corner, periphery, inner periphery and deep inner periphery coefficients are different in the wind tunnel data, four Sap2000 files as shown in Figure 11 are established. According to the different working conditions, six groups of models as shown in Figure 12 are established in each file. The first four groups of models are at 0 degrees, i.e. the models under the protection wind speed of strong wind, which correspond to the red dominant uplift force, orange dominant uplift force, red dominant downward pressure and orange dominant downward pressure in the wind tunnel test data.

[0145] Then, according to the segment load and angle obtained in step 3, the SetLocalAxes method in Sap2000 is used to set the angle of each segment. The parameters in this method are SetLocalAxes (serial number in the current model, angle). Then, the SetLoadDistributed method in Sap2000 is used to apply the corresponding load on the sub-segment principal axis according to the actual angle in different working condition models. The parameters in this method are SetLoadDistributed (serial number in the current model, load name, type (force or torque), direction (coordinate axis direction or gravity direction), load distance start point interval ratio, load distance end point interval ratio, start point load size, end point load size).

[0146] Step 5: Run the analysis and read the stress ratio and support reaction.

[0147] The finite element analysis is performed using the Analyze.RunAnalysis and DesignSteel.StartDesign methods in Sap2000 to obtain the analyzed model as shown in Figure 13 . .

[0148] Then the stress ratio of each section is obtained using the GetSummaryResult method in Sap2000 and is summarized into an array.

[0149] The reaction force of each section under different working condition combinations is obtained using the Results.FrameForce method in Sap2000, and the extreme value is stored in the array of the corresponding section.

[0150] Step 6: generating a graph and a table according to the obtained stress ratio data. According to the stress ratio data obtained in step 5, the main shaft stress ratio under the main wind protection wind speed, the main shaft stress ratio when tracking at 60 degrees, the main shaft stress ratio when tracking at 20 degrees, the stress ratio graph of the column, the main shaft torsion angle of each section under the main wind protection wind speed, and the main shaft deflection envelope graph of the corner, the periphery, the inner periphery, and the deep inner periphery are generated as shown in Figure 14 . The tracking support of the periphery, the inner periphery, and the deep inner periphery is divided according to the terrain and location of the specific project, and the specific division method is the prior art, which is not described in detail here.

[0151] Step 7: generating a support reaction force table according to the obtained support reaction force data. According to the support reaction force data obtained in step 5, the support reaction force table is generated as shown in Figure 15 , wherein the reaction force of the driving column has two rows, which are the support reaction force at 0 degrees (under the main wind protection wind speed) and the support reaction force at 60 degrees / 20 degrees (under the operating wind speed).

[0152] The stress ratio graph obtained by the above method can be used to judge whether the cross section of the currently selected main shaft and column meets the design requirements; and the support reaction force table obtained can be used as a reference for the pile foundation design and piling pulling force test of the project.

[0153] The main shaft on the other side of the driving device is designed using the above method.

[0154] In this embodiment, the automatic modeling method can quickly establish the main shaft and column models of different sections at different positions in a group of tracking supports into the finite element analysis software and automatically apply the load on each part for analysis, which is more accurate than the traditional method of calculating through specifications and formulas alone. There is no software method for automatically modeling and generating stress ratio and support reaction force charts in the mechanical calculation process of the multi-point driving tracking support in the industry at present.

[0155] Those skilled in the art can clearly understand that, for the convenience and brevity of description, only the division of the above program modules is taken as an example, and in actual application, the above functions can be completed by different program modules according to needs, that is, the internal structure of the device is divided into different program units or modules to complete all or part of the functions described above. Each program module in the embodiment can be integrated in one processing unit, or each unit can be physically present separately, or two or more units can be integrated in one processing unit. The above integrated units can be realized in the form of hardware or software program units. In addition, the specific names of each program module are only for the convenience of mutual differentiation, and do not limit the protection scope of the present application.

[0156] In the above embodiments, the description of each embodiment has its own emphasis, and the parts not described or recorded in detail in a certain embodiment can be referred to the related description of other embodiments.

[0157] Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be realized in electronic hardware or a combination of computer software and electronic hardware. Whether the functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. A person skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0158] In the embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. The division of the modules or units is only a logical function division, and actual implementation can have another division manner. For example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some interface, device or unit, and can be electrical, mechanical or other forms.

[0159] The units described as separate components can or can not be physically separated, and the components shown as units can or can not be physical units, that is, they can be located in one place, or can be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the embodiment.

[0160] In addition, the various functional units in the embodiments of the present application can be integrated in one processing unit, or each can exist physically as a separate unit, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be implemented in the form of hardware, or in the form of a software functional unit.

[0161] It should be noted that the above embodiments can be freely combined as needed. The above is only a preferred embodiment of the present application, and it should be pointed out that, for those skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, which should be considered as the protection scope of the present application.

Claims

1. A method of designing a multi-point drive photovoltaic tracking support, characterized in that, The photovoltaic tracking support is used for supporting photovoltaic modules, and comprises a plurality of columns, purlins, a main shaft and a plurality of driving devices, the main shaft is installed at the top of the plurality of columns, and the driving devices are used for driving the main shaft to rotate, comprising: segmenting the driving devices close to the outer end of the main shaft towards the outer end of the main shaft, and segmenting the main shaft between two driving devices to obtain the positions of a plurality of preset segments; calculating the torsion angles of the preset segments between the driving devices and the end of the main shaft, and between adjacent two driving devices; calculating the load parameters of each preset segment; establishing the main shaft and column model of the multi-point driving photovoltaic tracking support according to the positions of the plurality of preset segments, inputting the model parameters, the torsion angles of each preset segment and the load parameters, and performing finite element analysis to obtain stress ratios and support reaction force parameters; generating corresponding stress ratio charts and support reaction force tables based on the stress ratios and support reaction forces of the photovoltaic tracking support to design the photovoltaic tracking support; wherein the calculation of the torsion angle of each preset segment between the driving device and the end of the main shaft comprises: if the preset segment is located between the driving device and the single side of the main shaft, the torsion angle of the preset segment is obtained by accumulating and superimposing the torque from the driving device towards the outer end of the main shaft; if the preset segment is located between two driving devices, the torsion angle of the preset segment is obtained by accumulating and superimposing the torque from the driving device towards the critical position.

2. A method of designing a multi-point driven photovoltaic tracking support according to claim 1, characterized in that, Further comprising: the preset segment between two driving devices is subjected to relative torsion angle superposition from the main shaft where the two driving devices are located as the starting point, and when the torsion angles on both sides are equal, the corresponding position of the main shaft is the critical position of the preset segment between the two driving devices.

3. A method of designing a multi-point driven photovoltaic tracking support according to claim 1, characterized in that, The calculation formula of the torque is: T = q * C 2 *Li*GCM M&D ; T sum = T + T next ; Wherein, T sum is the accumulated actual torque; T is the torque of the current preset segment spindle; T next is the torque of the next segment spindle of the current preset segment; q is the wind pressure, unit Pa; C is the component height; Li is the length of the current preset segment; GCM M&D is the torque coefficient.

4. A method of designing a multi-point driven photovoltaic tracking support according to claim 3, characterized in that, The calculation formula of the torsion angle is: θ i = θ sum + Δθ i Wherein, θ sum is the cumulative torsion angle of the previous segment; Δθ i is the torsion angle added to the current preset segment; θ i is the actual torsion angle of the current preset segment; G is a constant load parameter, with units of N / mm 2 ; and J is the Saint-Venant constant of the current preset segment, with units of mm 4 .

5. The method of claim 1, wherein, The segmentation of the driving devices close to the outer end of the main shaft towards the outer end of the main shaft, and the segmentation of the main shaft between two driving devices to obtain the positions of a plurality of preset segments, comprising: corresponding wind tunnel test data of the positions of the columns are divided into a plurality of position points; the plurality of position points comprise the position points of the driving devices, the position points of the main shaft connectors and the position points of the columns, the position points of the driving devices, the position points of the main shaft connectors, the plurality of position points of the columns and the critical position points are all initial position points for segmenting the main shaft, and the plurality of positions of the preset segments can be obtained by removing and sorting the initial position points.

6. A method of designing a multi-point driven photovoltaic tracking support according to claim 1, characterized in that, Before the segmentation of the driving devices close to the outer end of the main shaft towards the outer end of the main shaft, and the segmentation of the main shaft between two driving devices to obtain the positions of a plurality of preset segments, further comprising: the positions of each photovoltaic module and the positions of the purlins are calculated based on the size information of the photovoltaic modules; the chord length and the total length of the photovoltaic tracking support are automatically calculated in combination with the number of photovoltaic module strings required by the target project. By setting the maximum span and the maximum length of the single main shaft of the photovoltaic tracking support, the size of the outer periphery, the inner periphery and the deep inner periphery between the photovoltaic tracking supports is obtained.

7. The method of claim 1, wherein, The load parameters of each of the preset sections are calculated, including: Based on the weight data of the photovoltaic module, the dead load of the main shaft in each preset section is calculated; Based on the basic snow pressure, chord length and inclination angle of the photovoltaic tracking support, the snow load of the main shaft in each preset section is calculated; Based on the wind pressure, chord length and wind tunnel test data of the photovoltaic tracking support, the wind load of the main shaft in each preset section is calculated.

8. A multi-point drive photovoltaic tracking system, characterized by, Including: The multi-point driving photovoltaic tracking support designed by the multi-point driving photovoltaic tracking support design method according to any one of claims 1-7.

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