A single-point drive photovoltaic tracking system and design method and device

Abstract

The present invention belongs to the field of photovoltaic technology, and provides a single-point driven photovoltaic tracking system design method, comprising: the photovoltaic tracking bracket is used to support photovoltaic components, the photovoltaic tracking bracket comprises a plurality of columns, purlins, a main shaft and a single driving device, the main shaft is installed on the top of the plurality of columns, the driving device is used to drive the main shaft to rotate, and the design method comprises: segmenting the main shaft on one side of the driving device axis to obtain the positions of a plurality of preset sections; calculating the torsion angle of each preset section between the driving device and the end of the main shaft; calculating the load parameter of each preset section; according to the positions of the plurality of preset sections, establishing the main shaft and column model of the single-point driven photovoltaic tracking bracket, inputting the model parameters, the torsion angle corresponding to each preset section, and the load parameters, and then performing finite element analysis to obtain the stress ratio and the support reaction force parameters.

Description

Technical Field

[0001] The present invention relates to the field of photovoltaic technology, and in particular to a single-point driven photovoltaic tracking system and a design method and device. Background Art

[0002] In the calculation of single-point driven photovoltaic flat single-axis tracking brackets, since different projects are located in different regions, at different altitudes, in different terrains and other environmental factors, the loads on the photovoltaic brackets vary greatly, and the loads on each part of the photovoltaic brackets also vary greatly. In order to reduce material redundancy and save costs while ensuring safety, each project needs to establish a separate model, specify the cross-sectional material for each component in the model, and consider the interference problems in the actual installation process. Engineers have a large number of projects to calculate, draw overall assembly drawings, produce calculation books, bills of materials, etc. every day. The large workload leads to a backlog of projects, and customers cannot get design solutions in a timely manner.

[0003] The current calculation model and load application method in the industry do not take into account the tracking bracket structure in different areas, the modeling accuracy is not high, the speed is relatively slow, and the modeling efficiency is not high. At the same time, there is currently no applicable software method in the industry that uses fully automatic modeling and generates stress ratios, support reaction force and other charts in the mechanical calculation process of single-point driven tracking brackets. Summary of the invention

[0004] The present invention aims at this problem and provides a single-point driven photovoltaic tracking system and a design method and device.

[0005] In order to achieve the above purpose of the present invention, the present invention is realized by the following technologies:

[0006] On the one hand, the present invention provides a design method for a single-point driven photovoltaic tracking bracket, wherein the photovoltaic tracking bracket is used to support photovoltaic modules, and the photovoltaic tracking bracket includes a plurality of columns, purlins, a main shaft and a single driving device, wherein the main shaft is installed on the top of the plurality of columns, and the driving device is used to drive the main shaft to rotate. The design method includes:

[0007] The main shaft on one side of the driving device is segmented to obtain positions of a plurality of preset segments;

[0008] Calculating the torsion angle of each of the preset sections between the driving device and the main shaft end;

[0009] Calculating the load parameters of each of the preset sections;

[0010] According to the positions of the plurality of preset sections, the main axis and column model of the single-point drive photovoltaic tracking bracket is established, and the finite element analysis is performed after the model parameters, the torsion angle corresponding to each preset section, and the load parameters are input to obtain the stress ratio and the support reaction force parameters;

[0011] The above method is used to design the main shaft on the other side of the driving device.

[0012] In some embodiments, calculating the torsion angle of each preset section between the driving device and the main shaft end comprises:

[0013] The torque of each preset section is calculated in sequence from the driving device toward one end of the main shaft, and the torque is iteratively accumulated in sequence from one end of the main shaft toward the driving device to obtain the torsional angles of the plurality of preset sections.

[0014] In some embodiments, the torque is calculated as follows:

[0015] T=q*C 2 *Li*GCM M&D ;

[0016] T sum =T+T next ;

[0017] Among them, T sum is the actual torque after accumulation; T is the torque of the main shaft in the current preset segment; T next is the torque of the main shaft of the next segment of the current preset segment; q is the wind pressure, in Pa; C is the component height; Li is the length of the current preset segment; GCM M&D is the torque coefficient.

[0018] In some embodiments, the calculation formula of the torsion angle is:

[0019]

[0020] θ i =Δθ i +θ sum

[0021] Among them, θ sum is the cumulative torsion angle of the previous section; Δθ i The twist 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, the unit is N / mm 2 ; J is the Saint-Venant constant of the current preset segment, in mm 4 .

[0022] In some embodiments, the main shaft on one side of the drive device is segmented to obtain the positions of multiple preset segments, including:

[0023] Dividing the wind tunnel test data corresponding to the position of the column into a plurality of position points;

[0024] The multiple position points include the position point of the driving device, the position point of the main shaft connecting part and the column position point. The position point of the driving device, the position point of the main shaft connecting part and the multiple column position points are all initial position points for segmenting the main shaft. The positions of the multiple preset segments can be obtained by deduplicating and sorting the initial position points.

[0025] In some embodiments, before the main shaft on one side of the driving device is segmented to obtain the positions of a plurality of preset segments, the method further includes:

[0026] The position of each photovoltaic module and the position of the purlin are calculated based on the size information of the photovoltaic module;

[0027] Combined with the number of photovoltaic modules required for the target project, the chord length and total length of the photovoltaic tracking bracket are automatically calculated;

[0028] By setting the maximum span and the maximum single main axis length of the photovoltaic tracking bracket, the dimensions of the outer perimeter, inner perimeter and deep inner perimeter between the photovoltaic tracking brackets are obtained.

[0029] In some implementations, calculating the load parameter of each of the preset segments includes:

[0030] Calculating the constant load of the main shaft in each preset section based on the weight data of the photovoltaic module;

[0031] Calculate the snow load of the main axis in each preset section based on the basic snow pressure, chord length and tilt angle of the photovoltaic tracking bracket;

[0032] Based on the wind pressure, chord length and wind tunnel test data of the photovoltaic tracking bracket, the wind load of the main shaft in each preset section is calculated.

[0033] In some embodiments, it further comprises:

[0034] Based on the stress ratio and support reaction force of the photovoltaic tracking bracket, a corresponding stress ratio diagram and support reaction force table are generated to design the photovoltaic tracking bracket.

[0035] In some embodiments, a single-point drive photovoltaic tracking system design device, the photovoltaic tracking bracket is used to support photovoltaic modules, the photovoltaic tracking bracket includes multiple columns, purlins, a main shaft and a single driving device, the main shaft is installed on the top of the multiple columns, the driving device is used to drive the main shaft to rotate, the design device includes:

[0036] A segmentation module, used to segment the main shaft on one side of the drive device axis to obtain the positions of multiple preset segments;

[0037] A calculation module, used for calculating the torsion angle of each of the preset sections between the driving device and the end of the main shaft;

[0038] The calculation module is further used to calculate the load parameters of each of the preset sections;

[0039] The acquisition module is used to establish the main axis and column model of the single-point drive photovoltaic tracking bracket according to the positions of the multiple preset segments, input the model parameters, the torsion angle corresponding to each preset segment, and the load parameters, and then perform finite element analysis to obtain the stress ratio and support reaction force parameters.

[0040] In some embodiments, a single-point driven photovoltaic tracking system includes: a single-point driven photovoltaic tracking system generated by using the single-point driven photovoltaic tracking system design method.

[0041] The single-point drive photovoltaic tracking system and design method and device provided by the present invention have at least the following beneficial effects:

[0042] The present invention proposes an automatic modeling method for mechanical analysis of a single-point driven photovoltaic tracking system, which generates stress ratio charts, support reaction forces, calculation books and other files based on finite element analysis results, and is used to quickly design a single-point driven photovoltaic tracking bracket. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The preferred implementation scheme will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above characteristics, technical features, advantages and implementation methods of a single-point drive photovoltaic tracking system design method.

[0044] Figure 1 It is a schematic diagram of an embodiment of a single-point drive photovoltaic tracking system design method in the present invention;

[0045] Figure 2 It is a schematic diagram of one side of the tracking bracket divided into two sides from the middle driving device in the present invention;

[0046] Figure 3 It is a schematic diagram of a diagram in which each large segment in the present invention is divided into 5 small segments;

[0047] Figure 4 It is a schematic diagram of a graph with added special point positions in the present invention;

[0048] Figure 5 It is a schematic diagram of the graph after arranging all points in the present invention;

[0049] Figure 6 It is a schematic diagram of all the actual spindles and columns in the present invention;

[0050] Figure 7 It is a schematic diagram of the position distribution of ER, EO1, EY1, EY2, EY3, and EO2 in the present invention;

[0051] Figure 8 is a schematic diagram of the dimension information of the components and purlins in the present invention;

[0052] Fig. 9 It is a schematic diagram of the size data of each area of ​​the photovoltaic bracket in the present invention;

[0053] Fig.10 It is a schematic diagram of the main dimensions of the photovoltaic bracket in the present invention;

[0054] Fig.11 It is a schematic diagram of the Sap2000 files of each region generated in the present invention;

[0055] Fig.12 It is a schematic diagram of 14 models in each zone of the present invention;

[0056] Fig.13 is a schematic diagram of the model analyzed in the present invention;

[0057] Fig.14 It is a schematic diagram of the main shaft and column stress ratio diagram in the present invention;

[0058] Fig.15 It is a schematic diagram of the support reaction table in the present invention. DETAILED DESCRIPTION

[0059] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0060] It should be understood that when used in this specification and the appended claims, the term "comprising" indicates the presence of the described features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or collections.

[0061] In order to simplify the drawings, only the parts related to the present invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn or marked. In this article, "one" not only means "only one", but also means "more than one".

[0062] It should be further understood that the term “and / or” used in the specification and appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0063] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0064] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0065] In one embodiment, Figure 1 As shown, the present invention provides an embodiment of a design method for a single-point driven photovoltaic tracking system, wherein the photovoltaic tracking bracket is used to support photovoltaic modules, and the photovoltaic tracking bracket includes a plurality of columns, purlins, a main shaft and a single driving device, wherein the main shaft is installed on the top of the plurality of columns, and the driving device is used to drive the main shaft to rotate. In this embodiment, the driving device is a rotary drive, and the design method includes:

[0066] S101: Segment the main shaft on one side of the drive device axis to obtain positions of multiple preset segments.

[0067] In this embodiment, the main shaft is segmented based on the division method in the wind tunnel test corresponding to the position of the main shaft and the position of the column, and the positions of multiple preset segments are obtained. By dividing the main shaft on one side of the drive device axis into 10 segments, Figure 2 Each interval from 1 to 10 in the above is the above preset interval.

[0068] S102 calculates the torsion angle of each preset section between the driving device and the main shaft end.

[0069] S103 calculates the load parameters of each preset segment.

[0070] S104 establishes the main axis and column model of the single-point drive photovoltaic tracking bracket according to the positions of the plurality of preset segments, inputs the model parameters, the torsion angle corresponding to each preset segment, and the load parameters, and then performs finite element analysis to obtain the stress ratio and support reaction force parameters.

[0071] S105 adopts the above method to design the main shaft on the other side of the driving device.

[0072] For example, after obtaining the constant load, snow load and wind load of each preset section, the corresponding interface of Sap2000 mechanical analysis software is used to establish a model in Sap2000 according to the position, direction, section, material and other information of each part of the main shaft and column, and apply the constant load, snow load and wind load on the main shaft according to the torsion angle of each section. Then the analysis begins, and according to the position of each value in the table in the analyzed file, the stress ratio and support reaction force data are taken to form an intuitive stress ratio chart and support reaction force table for easy viewing by engineers.

[0073] In this embodiment, the cross-sectional properties of each preset segment are obtained by comparing the position of each preset segment with the position of the actual main axis; the position and cross-sectional properties of each preset segment are loaded to establish an initial force analysis model; finite element analysis is performed on the initial force analysis model to obtain a target force analysis model after analysis to read the stress ratio and support reaction force parameters of the photovoltaic tracking bracket.

[0074] The present invention proposes an automatic modeling method for mechanical analysis of a single-point driven photovoltaic tracking system, which generates stress ratio charts, support reaction forces, calculation books and other files based on finite element analysis results, and is used to quickly design a single-point driven photovoltaic tracking bracket.

[0075] In one embodiment, calculating the torsion angle of each preset section between the drive device and the main shaft end comprises:

[0076] The torque of each preset section is calculated in sequence from the driving device toward one end of the main shaft, and the torque is iteratively accumulated in sequence from one end of the main shaft toward the driving device to obtain the torsional angles of the plurality of preset sections.

[0077] In some embodiments, the torque is calculated as follows:

[0078] T=q*C 2 *Li*GCM M&D ;

[0079] T sum =T+T next ;

[0080] Among them, T sumis the actual torque after accumulation; T is the torque of the main shaft in the current preset segment; T next is the torque of the main shaft of the next segment of the current preset segment; q is the wind pressure, in Pa; C is the component height; Li is the length of the current preset segment; GCM M&D is the torque coefficient.

[0081] In one embodiment, the calculation formula of the torsion angle is:

[0082]

[0083] θ i =Δθ i +θ sum

[0084] Among them, θ sum is the cumulative torsion angle of the previous section; Δθ i The twist 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, the unit is N / mm 2 ; J is the Saint-Venant constant of the current preset segment, in mm 4 .

[0085] In this embodiment, starting from the column where the driving device is located, the torque T of the main shaft of the current preset section is calculated section by section (Formula 1), and then starting from the last section of the main shaft, the torque T is accumulated one by one (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). This cycle is iterated 100 times to obtain the stable torsion angle of each section.

[0086] The dead load, snow load and wind load are then calculated on each major axis.

[0087] The method and formula are as follows:

[0088] Formula 1: T = q*C 2 *Li*GCM M&D

[0089] Formula 2: T sum =T+T next

[0090] Formula 3:

[0091] Formula 4: θ i =Δθ i +θ sum

[0092] After obtaining the constant load, snow load and wind load of each section, the corresponding interface of Sap2000 mechanical analysis software is used to establish a model in Sap2000 according to the position, direction, section, material and other information of each main shaft and column, and apply the constant load, snow load and wind load on the main shaft according to the torsion angle of each section. Then the analysis begins, and according to the position of each value in the table in the analyzed file, the stress ratio and support reaction force data are taken to form an intuitive stress ratio chart and support reaction force table for easy viewing by engineers.

[0093] In one embodiment, the main shaft on one side of the driving device is segmented to obtain the positions of multiple preset segments, including:

[0094] Dividing the wind tunnel test data corresponding to the position of the column into a plurality of position points;

[0095] The multiple position points include the position point of the driving device, the position point of the main shaft connecting part and the column position point. The position point of the driving device, the position point of the main shaft connecting part and the multiple column position points are all initial position points for segmenting the main shaft. The positions of the multiple preset segments can be obtained by deduplicating and sorting the initial position points.

[0096] In this embodiment, the main shaft is segmented for modeling according to the wind tunnel test data separation method corresponding to different positions of the main shaft and the column in the tracking bracket.

[0097] First, the wind tunnel data of the column is on the part with components laid on each side, which is divided into 10 sections on average, such as Figure 2 The figure shows one side of the tracking bracket divided into two sides from the middle drive device. Then each of the 10 segments is divided into 5 segments for iterative calculation of the torsion angle, as shown in FIG. Figure 3 Each large segment is divided into 5 small segments. Figure 4 As shown, then add the special points such as the middle motor position A, the main shaft connection position B, and the column position C without component distribution to the segment. Finally, sort all the points by position and remove duplicates. Removing duplicates means removing the overlapping position points and keeping only one point of the overlapping position. Sorting means starting from either end of the main shaft, sorting the position points according to the sequence number from left to right along the coordinate axis to get Figure 5 All segment positions shown.

[0098] In one embodiment, before the main shaft on one side of the driving device is segmented to obtain the positions of a plurality of preset segments, the method further comprises:

[0099] The position of each photovoltaic module and the position of the purlin are calculated based on the size information of the photovoltaic module;

[0100] Combined with the number of photovoltaic modules required for the target project, the chord length and total length of the photovoltaic tracking bracket are automatically calculated;

[0101] By setting the maximum span and the maximum single main axis length of the photovoltaic tracking bracket, the dimensions of the outer perimeter, inner perimeter and deep inner perimeter between the photovoltaic tracking brackets are obtained.

[0102] The dimensions of the circumference include the position of each photovoltaic module, the position of the purlin, the length of the main axis, the position of the main axis, the position of the column, and the span of the column.

[0103] In this embodiment, if Figure 6 The actual schematic diagram of all main shafts and columns is shown. After obtaining all segmented positions, they are compared with the positions of the main shafts used in the actual project to obtain the cross-sectional properties and materials of each small segment of the main shaft used for modeling and analysis. After obtaining the cross-sections and materials of all the segmented main shafts according to the above method, the torsion angle calculation is started according to the Wu, ER, EO1, EY1, EY2, EY3, EO2 conditions under the uplift Uplift in the wind tunnel data, and the Wd, ER, EO1, EY1, EY2, EY3, EO2 conditions under the downforce Downforce. Among them, Wu = Wind load uplift, the uplift caused by wind load, Wd = Wind load downforce, the downforce caused by wind load, ER, EO1, EY1, EY2, EY3, EO2 are the codes for the position and coefficient of the model in the wind tunnel data, and the specific position distribution is as follows: Figure 7 shown.

[0104] In one embodiment, the calculating the load to be applied to the main shaft in the preset section includes:

[0105] Calculating the constant load of the main shaft in each preset section based on the weight data of the photovoltaic module;

[0106] Calculate the snow load of the main axis in each preset section based on the basic snow pressure, chord length and tilt angle of the photovoltaic tracking bracket;

[0107] Based on the wind pressure, chord length and wind tunnel test data of the photovoltaic tracking bracket, the wind load of the main shaft in each preset section is calculated.

[0108] In this embodiment, the calculation of the load required to be applied to the main shaft in the preset section includes:

[0109] Based on the weight data of the photovoltaic module, the constant load of the main shaft in each preset section is calculated according to the following formula:

[0110]

[0111] Where: W is the weight of the photovoltaic module; g is the acceleration of gravity; n v is the number of photovoltaic modules in a single row; α is the angle value of the tilt angle; Used to convert to radians; Pi is the circumference of a circle.

[0112] The calculation of the load required to be applied to the main shaft in the preset section includes:

[0113] Based on the basic snow pressure, chord length, and tilt angle of the photovoltaic tracking bracket, the snow load on the main axis in each preset section is calculated using the following formula:

[0114] S=q s *L*(-0.018*α+1.273) / 1000

[0115] Where: q s is the basic snow pressure; L is the chord length; α is the inclination angle, when α≤15°, (-0.018*α+1.273) is equal to 1.

[0116] The calculation of the load required to be applied to the main shaft in the preset section includes:

[0117] Based on the wind pressure, chord length and wind tunnel test data of the photovoltaic tracking bracket, the wind load of the main axis in each preset section is calculated according to the following formula:

[0118] Pressure: W n =GC N *L*q / 1000

[0119] Torque: W v =GC M *L 2 *q

[0120] Among them: 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 section in the wind tunnel test data; L is the chord length; q is the wind pressure under the US2005 specification.

[0121] In one embodiment, it further includes:

[0122] Based on the stress ratio and support reaction force of the photovoltaic tracking bracket, a corresponding stress ratio diagram and support reaction force table are generated to design the photovoltaic tracking bracket.

[0123] In this embodiment, graphs and tables are generated based on the obtained stress ratio data. Fig.14The stress ratio diagram of the outer periphery, inner periphery, deep inner periphery, main shaft, ordinary column, and driving column is shown in FIG. Generate a support reaction table based on the support reaction data obtained. Generate the following table based on the support reaction data obtained in step 5: Fig.15 The support reaction table shown in the figure. The stress ratio diagram obtained by the above method can be used to determine whether the cross-section of the currently selected main shaft and column meets the design requirements; the support reaction table obtained can be used as a reference for the pile foundation design and pile pull-out force test of the project.

[0124] In one embodiment, the loading of the positions and cross-sectional properties of each preset segment, and setting the release angle, rigid angle and torsion angle of the main axis and the column to establish an initial force analysis model includes:

[0125] Draw an initial force analysis model according to the three-dimensional coordinates of the starting point, the three-dimensional coordinates of the end point and the section name in the section attributes in the positions of each preset segment;

[0126] The release angle, rigidity angle and torsion angle of the main axis and the column are set to complete the creation of the initial force analysis model.

[0127] In one embodiment, the setting of the release angle, rigid angle and torsion angle of the main shaft and the column to complete the creation of the initial force analysis model includes:

[0128] Establishing multiple initial force analysis models under different working conditions according to the outer coefficient, inner coefficient and deep inner coefficient in the wind tunnel test data;

[0129] The torsion angle of each preset segment is set in the initial force analysis model and a corresponding load is applied to the main axis of the preset segment.

[0130] In one embodiment, the present invention further provides a single-point drive photovoltaic tracking system design method, specifically comprising:

[0131] Step 1: Get the relevant size information of the photovoltaic tracking bracket based on the basic information of the project. Figure 8 The size of the photovoltaic modules shown and the hole position of the selected purlin can be used to calculate the distance between two adjacent photovoltaic modules, thereby obtaining the precise position of each photovoltaic module and purlin. Combined with the number of strings required for the project, the chord length C (total vertical height) and total length L of the photovoltaic tracking bracket can be automatically calculated. t Then, by setting the maximum span and the maximum length of a single main axis, we can get Fig. 9 Schematic diagram of the main dimensions of the outer perimeter, inner perimeter and deep inner perimeter shown.

[0132] These mainly include:

[0133] ① The location of each photovoltaic module, such as Fig.10 As shown in the numbers 1-36;

[0134] ② The position of all purlins, such as Fig.10 As shown in the box below the photovoltaic module;

[0135] ③The length and position of all principal axes, such as Fig.10 The horizontal rectangle below the center purlin is shown as follows: Fig.10 The (number 1, number 2, number 3) areas correspond to different main axis sections;

[0136] ④ The position and span of all columns, such as Fig.10 As shown in the vertical rectangle, Fig.10 The middle (number 1, number 2, number 3) areas correspond to different column cross sections;

[0137] Step 2, obtain the cross-section and position of the main axis of all subdivided segments. Figure 5 After obtaining all the subdivided segment positions, according to these subdivided segment positions and Fig. 9 The actual principal axis position is compared with the actual principal axis position in the model to obtain the cross-sectional properties of the subdivided segments. The division of subdivided segments makes the subsequent mechanical analysis more accurate.

[0138] Step 3: Obtain the load and direction required to be applied on the main axis of all subdivided segments. Based on the wind and snow pressure of the project, the deadweight of the components and brackets, and the wind tunnel data, calculate the load and direction required to be applied on all subdivided segments.

[0139] Step 4, pass all dimensions and load information into Sap2000 and establish the model. Use Sap2000's AddByCoord method to draw the model in Sap2000 according to the three-dimensional coordinates of the start and end points and the section name of each subdivided segment. The parameters in this method are AddByCoord (starting point X-axis coordinate, starting point Y-axis coordinate, starting point Z-axis coordinate, end point X-axis coordinate, end point Y-axis coordinate, end point Z-axis coordinate, starting point X-axis coordinate, return the serial number in the current model, the current preset section name), all of which have been obtained in step 2. After setting the release, rigid knot and rotation angle of the main axis and column through relevant methods, the model is created. Due to the different coefficients of the outer perimeter, inner perimeter and deep inner perimeter in the wind tunnel data, the following are established: Fig.11 The three Sap2000 files shown in the figure are created in each file according to different working conditions. Fig.12 14 groups of models shown.

[0140] Then, according to the segmented load and angle obtained in step 3, use the SetLocalAxes method in Sap2000 to set the angle of each segment. The parameters in this method are SetLocalAxes (serial number in the current model, angle). Then use the SetLoadDistributed method in Sap2000 to apply the corresponding load on the subdivided main axis of different working condition models according to the actual angle. The parameters in this method are:

[0141] SetLoadDistributed (serial number in the current model, load name, type (force or torque), direction (coordinate axis direction or gravity direction), load spacing ratio from the start point, load spacing ratio from the end point, load size at the start point, load size at the end point).

[0142] Step 5. Run the analysis and read the stress ratio and support reaction.

[0143] First, use the Analyze.RunAnalysis and DesignSteel.StartDesign methods in Sap2000 to perform finite element analysis and obtain the following Fig.13 The model after analysis is shown in the figure. Then, the GetSummaryResult method in Sap2000 is used to obtain the stress ratio of each small segment and summarize it into an array.

[0144] Then use the Results.FrameForce method in Sap2000 to obtain the reaction force of each small segment under different working conditions, and take the extreme value and store it in the array of the corresponding small segment.

[0145] Step 6: Generate graphs and tables based on the stress ratio data obtained. Fig.14 The stress ratio diagram of the main shaft, common column and driving column of the outer periphery, inner periphery and deep inner periphery is shown. The tracking brackets of the outer periphery, inner periphery and deep inner periphery are divided according to the terrain and location of the specific project. The specific division method is the existing technology and will not be described in detail here.

[0146] Step 7: Generate a support reaction table based on the support reaction data obtained. Fig.15 Support reaction table shown.

[0147] The stress ratio diagram obtained according to the above method can be used to determine whether the cross-sections of the currently selected main shaft and column meet the design requirements; the obtained support reaction table can be used as a reference for the project's pile foundation design and pile pull-out force test.

[0148] The above method is used to design the main shaft on the other side of the drive device.

[0149] In this embodiment, the load to be applied to the first subdivided segment is automatically calculated based on the wind tunnel test data and the cross-sectional parameters of each component of the bracket, and the model is automatically built and the load is applied in Sap2000, and the calculation and analysis are performed to extract data such as stress ratio and support reaction force, so that the mechanical analysis work is automated and graphical.

[0150] In one embodiment, the present invention further provides a single-point drive photovoltaic tracking system design device, wherein the photovoltaic tracking bracket is used to support photovoltaic modules, and the photovoltaic tracking bracket includes a plurality of columns, purlins, a main shaft and a single driving device, wherein the main shaft is installed on the top of the plurality of columns, and the driving device is used to drive the main shaft to rotate, and the design device includes:

[0151] A segmentation module, used to segment the main shaft on one side of the drive device axis to obtain the positions of multiple preset segments;

[0152] A calculation module, used for calculating the torsion angle of each of the preset sections between the driving device and the end of the main shaft;

[0153] The calculation module is further used to calculate the load parameters of each preset section;

[0154] The acquisition module is used to establish the main axis and column model of the single-point drive photovoltaic tracking bracket according to the positions of the multiple preset segments, input the model parameters, the torsion angle corresponding to each preset segment, and the load parameters, and then perform finite element analysis to obtain the stress ratio and support reaction force parameters.

[0155] In one embodiment, the present invention further provides a single-point driven photovoltaic tracking system, comprising: a single-point driven photovoltaic tracking system generated by using the single-point driven photovoltaic tracking system design method.

[0156] Those skilled in the art can clearly understand that, for the convenience and simplicity of description, only the division of the above-mentioned program modules is used as an example for illustration. In actual applications, the above-mentioned functions can be assigned to different program modules as needed, that is, the internal structure of the device can be divided into different program units or modules to complete all or part of the functions described above. The program modules in the embodiment can be integrated into a processing unit, or each unit can exist physically separately, or two or more units can be integrated into a processing unit, and the above-mentioned integrated unit can be implemented in the form of hardware or in the form of software program units. In addition, the specific names of the program modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application.

[0157] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0158] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented with electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed with hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0159] In the embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. Exemplarily, the device embodiments described above are merely schematic. Exemplarily, the division of the modules or units is only a logical function division. There may be other division methods in actual implementation. Exemplarily, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, and the indirect coupling or communication connection of the device or unit can be electrical, mechanical or other forms.

[0160] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0161] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0162] It should be noted that the above embodiments can be freely combined as needed. The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered as the protection scope of the present invention.

Claims

1. A single-point drive photovoltaic tracking bracket design method, characterized in that: The photovoltaic tracking bracket is used to support and rotate the photovoltaic assembly. The photovoltaic tracking bracket includes a plurality of columns, purlins, a main shaft and a single driving device. The main shaft is installed on the top of the plurality of columns. The driving device is used to drive the main shaft to rotate, including: Step S101: Segment the main shaft on one side of the driving device axis to obtain positions of a plurality of preset segments; Step S102: calculating the torsion angle of each of the preset sections between the driving device and the main shaft end; Step S103: calculating the load parameters of each of the preset sections; Step S104: establishing the main axis and column model of the single-point drive photovoltaic tracking bracket according to the positions of the plurality of preset segments, inputting the model parameters, the torsion angle corresponding to each preset segment, and the load parameters, and then performing finite element analysis to obtain the stress ratio and the support reaction force parameters; Step S105 designs the main shaft on the other side of the driving device by using steps S101 to S104; Based on the stress ratio and support reaction force of the photovoltaic tracking bracket, a corresponding stress ratio diagram and support reaction force table are generated to design the photovoltaic tracking bracket; The calculating of the torsion angle of each preset section between the driving device and the end of the main shaft comprises: calculating the torque of each preset section in sequence from the driving device toward one end of the main shaft, and iteratively accumulating the torque in sequence from one end of the main shaft toward the driving device to obtain the torsion angles of the plurality of preset sections; The calculation formula of the torsion angle is: i i =Δθ i +θ sum Among them, T sum is the actual torque after accumulation; θ sum is the cumulative torsion angle of the previous section; Δθ i The twist 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, the unit is N / mm 2 ; J is the Saint-Venant constant of the current preset segment, in mm 4 ; Based on the stress ratio and support reaction force of the photovoltaic tracking bracket, a corresponding stress ratio diagram and support reaction force table are generated to design the photovoltaic tracking bracket.

2. A single-point drive photovoltaic tracking bracket design method according to claim 1, characterized in that: The torque is calculated as follows: T=q*C 2 *Li*GCM M&D ; T sum =T+T next ; Among them, T sum is the actual torque after accumulation; T is the torque of the main shaft in the current preset segment; T next is the torque of the main shaft of the next segment of the current preset segment; q is the wind pressure, in Pa; C is the component height; Li is the length of the current preset segment; GCM M&D is the torque coefficient.

3. The single-point drive photovoltaic tracking bracket design method according to claim 1 is characterized in that: The step of segmenting the main shaft on one side of the drive device axis to obtain the positions of multiple preset segments includes: Dividing the wind tunnel test data corresponding to the position of the column into a plurality of position points; The multiple position points include the position point of the driving device, the position point of the main shaft connecting part and the column position point. The position point of the driving device, the position point of the main shaft connecting part and the multiple column position points are all initial position points for segmenting the main shaft. The positions of the multiple preset segments can be obtained by deduplicating and sorting the initial position points.

4. The single-point drive photovoltaic tracking bracket design method according to claim 1 is characterized in that: Before the main shaft on one side of the driving device is segmented to obtain the positions of a plurality of preset segments, the method further includes: The position of each photovoltaic module and the position of the purlin are calculated based on the size information of the photovoltaic module; Combined with the number of photovoltaic modules required for the target project, the chord length and total length of the photovoltaic tracking bracket are automatically calculated; By setting the maximum span and the maximum single main axis length of the photovoltaic tracking bracket, the dimensions of the outer perimeter, inner perimeter and deep inner perimeter between the photovoltaic tracking brackets are obtained.

5. The single-point drive photovoltaic tracking bracket design method according to claim 1, characterized in that: The calculating of the load parameter of each preset segment includes: Calculating the constant load of the main shaft in each preset section based on the weight data of the photovoltaic module; Calculate the snow load of the main axis in each preset section based on the basic snow pressure, chord length and tilt angle of the photovoltaic tracking bracket; Based on the wind pressure, chord length and wind tunnel test data of the photovoltaic tracking bracket, the wind load of the main shaft in each preset section is calculated.

6. A single-point drive photovoltaic tracking bracket design device, characterized in that: The photovoltaic tracking bracket is used to support photovoltaic modules. The photovoltaic tracking bracket includes multiple columns, purlins, a main shaft and a single driving device. The main shaft is installed on the top of the multiple columns. The driving device is used to drive the main shaft to rotate. The design device includes: A segmentation module, used to segment the main shaft on one side of the drive device axis to obtain the positions of multiple preset segments; A calculation module, used for calculating the torsion angle of each preset section between the drive device and the end of the main shaft; wherein the calculation of the torsion angle of each preset section between the drive device and the end of the main shaft comprises: sequentially calculating the torque of each preset section from the drive device toward one end of the main shaft, and sequentially iteratively accumulating the torque from one end of the main shaft toward the drive device to obtain the torsion angles of the plurality of preset sections; The calculation formula of the torsion angle is: i i =Δθ i +θ sum Among them, T sum is the actual torque after accumulation; θ sum is the cumulative torsion angle of the previous section; Δθ i The twist 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, the unit is N / mm 2 ; J is the Saint-Venant constant of the current preset segment, in mm 4 ; The calculation module is further used to calculate the load parameters of each of the preset sections; The acquisition module is used to establish the main axis and column model of the single-point drive photovoltaic tracking bracket according to the positions of the multiple preset segments, input the model parameters, the torsion angle corresponding to each preset segment, and the load parameters, and then perform finite element analysis to obtain the stress ratio and support reaction force parameters.

7. A single-point drive photovoltaic tracking system, characterized in that: include: A single-point driven photovoltaic tracking system is generated by the single-point driven photovoltaic tracking bracket design method as described in any one of claims 1 to 5.

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