A method, device and equipment for adjusting cable force of a three-cable photovoltaic flexible support
By calculating the critical wind speeds for flutter instability and calm wind instability, the target cable force value was selected, which solved the problem that the cable force of the three-cable photovoltaic flexible support could not be adaptively adjusted, thus improving the wind resistance stability and design economy of the support.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CHINA HUANENG INT ENG & TECH CO LTD
- Filing Date
- 2026-04-20
- Publication Date
- 2026-07-21
AI Technical Summary
The cable force of existing three-cable photovoltaic flexible supports cannot be adaptively adjusted, resulting in insufficient safety and stability of the supports in areas with significant wind loads. They cannot be accurately adapted, and the operation is cumbersome and inefficient.
By acquiring structural properties and aerodynamic parameters, and combining them with air density, the critical wind speeds for flutter instability and calm wind instability are calculated, and the target cable force value is selected to achieve adaptive adjustment of the load-bearing cable.
It enables precise adjustment of the cable force of the three-cable photovoltaic flexible support, improves wind resistance stability and design economy, and avoids safety hazards and cost waste.
Smart Images
Figure CN122433237A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of photovoltaic support technology, and more specifically, to a method, apparatus and equipment for adjusting the cable force of a three-cable photovoltaic flexible support. Background Technology
[0002] Flexible photovoltaic (PV) support structures are a new type of support structure that mounts PV modules on a parallel prestressed cable system. They mainly consist of a load-bearing cable system, end and middle support structures, and a wind-resistant stabilization system. In recent years, thanks to their significant advantages such as high land utilization efficiency, strong terrain adaptability, and minimal ecological disturbance, this structural form has been rapidly promoted and applied in PV power plant construction.
[0003] However, the dual-cable flexible photovoltaic support system, widely used in current engineering projects, faces significant challenges in its wind resistance stability. This system's lightweight structure and low natural frequency make it susceptible to two main types of instability under strong winds: dynamic instability, manifested as significant flutter due to aeroelastic coupling at high wind speeds, which can lead to structural damage or even failure over time; and static instability, where insufficient out-of-plane stiffness can cause excessive deformation under sustained static wind loads, potentially leading to torsional divergence or overall overturning. These two problems severely restrict the safe and reliable application of dual-cable flexible supports in areas with significant wind loads.
[0004] To address this issue, existing technologies have introduced improved solutions using a spatial cable net system composed of three load-bearing cables. While this type of three-cable system, achieved by increasing the number of cable strands and optimizing spatial arrangement, theoretically improves the overall structural stiffness and aerodynamic stability, it still faces significant limitations in practical engineering applications. In existing three-cable systems, the cable tension of each load-bearing cable is a fixed value pre-set based on human experience, unable to adaptively adjust according to actual conditions or achieve precise matching. This means that even if excessive or insufficient cable tension leads to deformation or instability of the support structure, rapid and precise fine-tuning is impossible; the system must be disassembled and re-tensioned, resulting in cumbersome and extremely inefficient operations. Summary of the Invention
[0005] The purpose of this application is to provide a method, apparatus, and equipment for adjusting the cable force of a three-cable photovoltaic flexible support, so as to solve the above-mentioned problems existing in the prior art and realize the adaptive adjustment of the cable force of the three-cable photovoltaic flexible support.
[0006] Firstly, a method for adjusting the cable force of a three-cable flexible photovoltaic support system is provided, which is applied in the controller of the three-cable flexible photovoltaic support system. The method may include: Obtain the structural property parameters and aerodynamic characteristic parameters of the system, as well as the air density of the environment in which the system is located; Based on the configured initial cable force values and the structural property parameters, calculate the structural dynamic parameters corresponding to each initial cable force value; Based on the initial cable force values, the structural property parameters, the structural dynamic parameters, the aerodynamic characteristic parameters, and the air density, calculate the flutter instability critical wind speed and the still wind instability critical wind speed corresponding to each initial cable force value. Based on the flutter instability critical wind speed and calm wind instability critical wind speed corresponding to each initial cable force value, and the configured screening rules, the target cable force value is obtained by screening from each initial cable force value; Adjust the tension of the load-bearing cable of the system according to the target cable tension value.
[0007] In an optional implementation, the three-cable photovoltaic flexible support system includes: multiple photovoltaic modules, a first support column, a second support column, and a cable tension adjustment mechanism; The load-bearing cable is tensioned and anchored between the first and second pillars; multiple photovoltaic modules are fixed to the load-bearing cable; The load-bearing cable includes: a first load-bearing cable, a second load-bearing cable, and a third load-bearing cable; the first load-bearing cable, the second load-bearing cable, and the third load-bearing cable are parallel; The cable tension adjustment mechanism is located between the end of the third load-bearing cable and the anchorage point of the first or second support column, and is used to adjust the cable tension of the third load-bearing cable.
[0008] In an optional implementation, the structural attribute parameters include: the geometric parameters of the photovoltaic module, the span of the photovoltaic module between the first and second pillars, the cable spacing between any two load-bearing cables, the ratio of the cable spacing to the width of the photovoltaic module, the structural parameters of the load-bearing cables, the cable force of the first and second load-bearing cables, the structural vertical bending damping ratio, and the structural torsional damping ratio. The aerodynamic characteristic parameters include: the derivative of the lift moment coefficient with respect to the wind angle of attack and the flutter derivative.
[0009] In an optional implementation, the structural dynamic parameters include: the structural vertical bending natural frequency and the structural torsional natural frequency; Based on the configured initial cable force values and the structural property parameters, the structural dynamic parameters corresponding to each initial cable force value are calculated, including: For any initial cable force value, the structural vertical bending natural frequency and structural torsional natural frequency of the initial cable force value are calculated based on the initial cable force value, the cable forces of the first weighing cable and the second load-bearing cable, the span of the photovoltaic module, the ratio of the cable spacing to the width of the photovoltaic module, the geometric parameters of the photovoltaic module, and the structural parameters of the load-bearing cable.
[0010] In an optional implementation, the critical flutter instability wind speed corresponding to each initial cable force value is calculated based on the initial cable force values, the structural property parameters, the structural dynamic parameters, the aerodynamic characteristic parameters, and the air density, including: For any initial cable force value, the critical wind speed for flutter instability of the initial cable force value is calculated based on the initial cable force value, the structural property parameters, the structural vertical bending natural frequency, the structural torsional natural frequency, the flutter derivative, and the air density.
[0011] In an optional implementation, the critical wind speed for static instability corresponding to each initial cable force value is calculated based on the initial cable force values, the structural property parameters, the structural dynamic parameters, the aerodynamic characteristic parameters, and the air density, including: For any initial cable force value, the critical wind speed for static instability of the initial cable force value is calculated based on the cable forces of the first weighing cable and the second load-bearing cable, the initial cable force value, the span of the photovoltaic module, the ratio of the cable spacing to the width of the photovoltaic module, the geometric parameters of the photovoltaic module, the structural parameters of the load-bearing cable, the derivative of the lift moment coefficient with respect to the wind angle of attack, and the air density.
[0012] In an optional implementation, the target cable force value is obtained by filtering from the initial cable force values based on the flutter instability critical wind speed and the calm wind instability critical wind speed corresponding to each initial cable force value, as well as the configured filtering rules. This includes: Each initial cable force value that meets the configured filtering rules is used as a candidate cable force value; The candidate cable force value with the largest flutter instability critical wind speed and calm wind instability critical wind speed is taken as the target cable force value.
[0013] Secondly, a cable tension adjustment device for a three-cable photovoltaic flexible support system is provided, which is applied in the controller of the three-cable photovoltaic flexible support system. The device may include: The acquisition unit is used to acquire the structural property parameters and aerodynamic characteristic parameters of the system, as well as the air density of the environment in which the system is located; The first calculation unit is used to calculate the structural dynamic parameters corresponding to each initial cable force value based on the configured multiple initial cable force values and the structural property parameters. The second calculation unit is used to calculate the flutter instability critical wind speed and the still wind instability critical wind speed corresponding to each initial cable force value based on each initial cable force value, the structural property parameters, the structural dynamic parameters, the aerodynamic characteristic parameters and the air density. The filtering unit is used to filter out the target cable force value from each initial cable force value according to the flutter instability critical wind speed and the calm wind instability critical wind speed corresponding to each initial cable force value and the configured filtering rules. An adjustment unit is used to adjust the cable force of the load-bearing cable of the three-cable photovoltaic flexible support system according to the target cable force value.
[0014] Thirdly, an electronic device is provided, which includes a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other through the communication bus; Memory, used to store computer programs; When a processor executes a program stored in memory, it implements any of the steps described in the first aspect above.
[0015] Fourthly, a computer-readable storage medium is provided, wherein a computer program is stored therein, and when executed by a processor, the computer program implements the steps of any of the methods described in the first aspect above.
[0016] This application combines structural properties, aerodynamic characteristics, and environmental parameters to rapidly analyze and calculate the structural dynamic parameters and critical wind speed under different initial cable forces. It can accurately select the optimal target cable force value that meets the dual safety requirements of calm wind stability and flutter stability, realize the quantitative and performance-based adjustment of the load-bearing cable force, significantly improve the wind resistance stability and design economy of the flexible photovoltaic support system, and avoid the safety hazards and cost waste caused by experience-based design. Attached Figure Description
[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0018] Figure 1 An architectural diagram of a three-cable photovoltaic flexible support system provided in this application embodiment; Figure 2 This application provides an architectural diagram of another three-cable photovoltaic flexible support system. Figure 3 A schematic flowchart illustrating a method for adjusting the cable force of a three-cable photovoltaic flexible support provided in this application embodiment; Figure 4 This is a schematic diagram of the cable force adjustment device for a three-cable photovoltaic flexible support provided in an embodiment of this application; Figure 5 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application; In the diagram, 1 is the load-bearing cable; 2 is the photovoltaic module; 3 is the central axis of the photovoltaic module; 4 is the third load-bearing cable; 5 is the support column; 6 is the cable tension adjustment mechanism; and 7 is the controller. Detailed Implementation
[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. Unless otherwise defined, the technical or scientific terms used in this application should have the ordinary meaning understood by those skilled in the art. The words "first," "second," and similar terms used in this application do not indicate any order, quantity, or importance, but are only used to distinguish different components. The words "comprising" or "including," etc., mean that the element or object preceding the word covers the element or object listed after the word and its equivalents, but do not exclude other elements or objects. The words "connected," "coupled," or "connected," etc., are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up," "down," "left," "right," etc., are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.
[0020] The cable tension adjustment method for the three-cable flexible photovoltaic support provided in this application embodiment can be applied to... Figure 1 In the controller of the system architecture shown, such as Figures 1-2 As shown, the system may include: multiple photovoltaic modules 2, multiple support columns 5, cable tension adjustment mechanism 6, first load-bearing cable, second load-bearing cable, third load-bearing cable 4, and controller 7; The controller 7 is used to execute the cable force adjustment method of the three-cable photovoltaic flexible support provided in the embodiments of this application; The multiple support pillars 5 may include: a first support pillar and a second support pillar; the first and second support pillars are fixed to the ground and are distributed at intervals along the longitudinal direction. The first, second, and third load-bearing cables 4 are tensioned and anchored between the first and second supports, respectively; the first, second, and third load-bearing cables 4 are parallel, and the spacing between any two load-bearing cables 4 is fixed and the same; the first, second, and third load-bearing cables 4 extend longitudinally and are arranged in parallel at a fixed spacing in the transverse direction; the first, second, and third load-bearing cables 4 are rigidly connected by a connecting assembly; wherein, the connecting assembly may include: a clamp and a transverse connector; Multiple photovoltaic modules 2 are fixed to the first load-bearing cable, the second load-bearing cable, and the third load-bearing cable 4 by connectors and clamping components; The cable tension adjustment mechanism 6 is located between the end of the third load-bearing cable and the anchorage point of the first or second support column, and is used to adjust the cable tension of the third load-bearing cable.
[0021] The preferred embodiments of this application are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit this application. Furthermore, the embodiments and features in the embodiments of this application can be combined with each other without conflict.
[0022] Figure 3 This is a flowchart illustrating a method for adjusting the cable force of a three-cable photovoltaic flexible support, as provided in an embodiment of this application. Figure 3 As shown, the method may include: Step S310: Obtain the structural property parameters and aerodynamic characteristic parameters of the system, as well as the air density of the environment in which the system is located.
[0023] The structural attribute parameters may include: the geometric parameters of the photovoltaic module, the span of the photovoltaic module between the first and second pillars, the cable spacing between any two load-bearing cables, the ratio of the cable spacing to the width of the photovoltaic module, the structural parameters of the load-bearing cables, the cable forces of the first and second load-bearing cables, the structural vertical bending damping ratio, and the structural torsional damping ratio; the cable forces of the first and second load-bearing cables are the same; the geometric parameters of the photovoltaic module may include: quantity, mass, width, and tilt angle; the structural parameters of the load-bearing cables may include: mass per unit length and axial stiffness; the mass per unit length can be the linear mass density of the load-bearing cable; aerodynamic characteristic parameters include: the three-component force coefficients, the derivative of the lift moment coefficient with respect to the wind angle of attack, and the flutter derivative; the flutter derivative can be obtained by wind tunnel testing or numerical simulation.
[0024] Step S320: Calculate the structural dynamic parameters corresponding to each initial cable force value based on the configured multiple initial cable force values and structural property parameters.
[0025] Among them, the structural dynamic parameters may include: the structural vertical bending natural frequency and the structural torsional natural frequency.
[0026] In practice, based on the initial cable force value, the number, mass, and tilt angle of the photovoltaic modules, as well as the cable forces of the first and second load-bearing cables, the span of the photovoltaic modules, and the unit length mass and axial stiffness of the load-bearing cables, the structural vertical bending natural frequency of the initial cable force value is calculated; the formula for calculating the structural vertical bending natural frequency is as follows: ;in, Indicates the natural frequency of the vertical bending of the structure; Indicates the cable force of the first weighing cable or the second supporting cable; This represents the initial cable force value and the ratio of the cable force value to that of the first or second load-bearing cable; Indicates the span of the photovoltaic module; Indicates the number of photovoltaic modules. Indicates the mass of the photovoltaic module; EA represents the axial stiffness; Indicates mass per unit length; The tilt angle of the photovoltaic module is represented by ; g represents the acceleration due to gravity. Based on the initial cable force value, the number, mass, width, and tilt angle of the photovoltaic modules, as well as the ratio of the cable force of the first and second weighing cables to the width of the photovoltaic modules, the span of the photovoltaic modules, and the unit length mass and axial stiffness of the weighing cables, the structural torsional natural frequency at this initial cable force value is calculated. The formula for calculating the structural torsional natural frequency can be: ; Represents the torsional natural frequency of the structure; where, Indicates the width of the photovoltaic module; This represents the ratio of the cable spacing to the width of the photovoltaic module.
[0027] Step S330: Based on each initial cable force value, structural property parameter, structural dynamic parameter, aerodynamic characteristic parameter and air density, calculate the critical wind speed for flutter instability and the critical wind speed for still wind instability corresponding to each initial cable force value.
[0028] In practical implementation, the vertical bending mode mass and torsional mode mass are calculated based on the ratio of the number and mass of photovoltaic modules, the span of photovoltaic modules, the cable spacing, and the width of photovoltaic modules, as well as the mass per unit length; among which, , Indicates the modal mass of vertical bending; , Indicates torsional modal mass; For any initial cable force value, calculate the critical flutter instability wind speed based on the vertical bending modal mass, torsional modal mass, structural vertical bending natural frequency, structural torsional natural frequency, flutter derivative, and air density. The calculation model for the critical flutter instability wind speed may include: ; ; in, Represents the total damping matrix of the system. Represents the structural damping matrix. ; Represents the aerodynamic damping matrix; U represents the flutter critical wind speed value; Indicates the reduction frequency. ; , This is the flutter derivative; Indicates the vertical bending damping ratio of the structure; This represents the structural torsional damping ratio; when the flutter critical wind speed is reached, the total damping vertical bending or torsional component of the system is 0. Solve for... Corresponding This refers to the flutter critical wind speed value of the flexible photovoltaic structure system.
[0029] Based on the derivatives of the three force coefficients, the lift moment coefficient, and the wind angle of attack, and the air density, calculate the critical wind speed for calm-wind instability for this initial cable force value; the formula for calculating the critical wind speed for calm-wind instability can be: ;in It is the derivative of the lift moment coefficient with respect to the angle of attack at the standard tilt angle; This indicates air density.
[0030] Step S340: Based on the flutter instability critical wind speed and calm wind instability critical wind speed corresponding to each initial cable force value and the configured screening rules, the target cable force value is selected from each initial cable force value.
[0031] The filtering rules may include: a first threshold and a second threshold.
[0032] In practice, the initial cable force values where the critical wind speed for flutter instability is greater than the first threshold and the critical wind speed for calm wind instability is greater than the second threshold are taken as candidate cable force values; the candidate cable force value with the largest critical wind speed for flutter instability and critical wind speed for calm wind instability is taken as the target cable force value.
[0033] Step S350: Adjust the cable force of the load-bearing cable of the system according to the target cable force value.
[0034] In practice, control parameters are generated based on the target cable force value; the cable force adjustment mechanism is controlled based on the control parameters so that the cable force adjustment mechanism adjusts the cable force of the third load-bearing cable to the target cable force value.
[0035] This application uses wind tunnel tests or computational fluid dynamics numerical simulations to obtain system aerodynamic parameters (such as three-component force coefficients and flutter derivatives) in advance. By applying aeroelastic stability theory, it can quickly predict and calculate the critical wind speed for static instability and flutter under the corresponding intermediate cable force, thus realizing a quantitative and efficient evaluation of the key wind resistance performance indicators of the structure.
[0036] This application combines rapid critical wind speed prediction with cable force optimization, providing a quantitative design basis for setting the cable force of the third load-bearing cable. Based on the wind load conditions of the target site, the cable force adjustment method of the three-cable photovoltaic flexible support provided in this application can determine the optimal target cable force value of the third load-bearing cable that simultaneously meets the safety requirements for structural stability in calm winds and flutter, thereby guiding construction tensioning and subsequent operation and maintenance adjustments. The physical adjustability of the third load-bearing cable is directly linked to the wind resistance performance of the structure through a theoretical model, realizing a leap from empirical construction to performance-based design, and improving the scientific and economic aspects of the design while ensuring structural safety.
[0037] Corresponding to the above method, this application embodiment also provides a cable force adjustment device for a three-cable photovoltaic flexible support, such as... Figure 4 As shown, the device includes: The acquisition unit 410 is used to acquire the structural property parameters and aerodynamic characteristic parameters of the system, as well as the air density of the system's environment; The first calculation unit 420 is used to calculate the structural dynamic parameters corresponding to each initial cable force value based on the configured multiple initial cable force values and structural property parameters. The second calculation unit 430 is used to calculate the critical wind speed for flutter instability and the critical wind speed for still wind instability corresponding to each initial cable force value based on each initial cable force value, structural property parameters, structural dynamic parameters, aerodynamic characteristic parameters and air density. The filtering unit 440 is used to filter the target cable force value from each initial cable force value according to the flutter instability critical wind speed and the calm wind instability critical wind speed corresponding to each initial cable force value and the configured filtering rules. Adjustment unit 450 is used to adjust the cable force of the load-bearing cable of the three-cable photovoltaic flexible support system according to the target cable force value.
[0038] The functions of each functional unit of the cable tension adjustment device of the three-cable photovoltaic flexible support provided in the above embodiments of this application can be realized through the above-described method steps. Therefore, the specific working process and beneficial effects of each unit in the cable tension adjustment device of the three-cable photovoltaic flexible support provided in the embodiments of this application will not be repeated here.
[0039] This application also provides an electronic device, such as... Figure 5 As shown, it includes a processor 510, a communication interface 520, a memory 530, and a communication bus 540, wherein the processor 510, the communication interface 520, and the memory 530 communicate with each other through the communication bus 540.
[0040] Memory 530 is used to store computer programs; When the processor 510 executes the program stored in the memory 530, it performs the following steps: Obtain the system's structural and aerodynamic parameters, as well as the air density of the system's environment; Based on the configured initial cable force values and structural property parameters, calculate the structural dynamic parameters corresponding to each initial cable force value; Based on the initial cable force values, structural property parameters, structural dynamic parameters, aerodynamic characteristic parameters, and air density, calculate the critical wind speeds for flutter instability and calm wind instability corresponding to each initial cable force value. Based on the flutter instability critical wind speed and calm wind instability critical wind speed corresponding to each initial cable force value, and the configured screening rules, the target cable force value is obtained by screening from each initial cable force value; Adjust the tension of the load-bearing cables of the system according to the target tension value.
[0041] The communication bus mentioned above can be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. This communication bus can be divided into address bus, data bus, control bus, etc. For ease of illustration, only one thick line is used to represent it in the diagram, but this does not mean that there is only one bus or one type of bus.
[0042] The communication interface is used for communication between the aforementioned electronic devices and other devices.
[0043] The memory may include random access memory (RAM) or non-volatile memory (NVM), such as at least one disk storage device. Optionally, the memory may also be at least one storage device located remotely from the aforementioned processor.
[0044] The processors mentioned above can be general-purpose processors, including central processing units (CPUs), network processors (NPs), etc.; they can also be digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components.
[0045] The implementation methods and beneficial effects of the various components of the electronic device in the above embodiments for solving the problem can be found in [reference needed]. Figure 3 The steps in the illustrated embodiments are used to implement the electronic device. Therefore, the specific working process and beneficial effects of the electronic device provided in this application will not be repeated here.
[0046] In another embodiment provided in this application, a computer-readable storage medium is also provided, which stores instructions that, when executed on a computer, cause the computer to perform the cable force adjustment method of any of the three-cable photovoltaic flexible supports described in the above embodiments.
[0047] In another embodiment provided in this application, a computer program product containing instructions is also provided, which, when run on a computer, causes the computer to execute the cable force adjustment method of any of the above embodiments for the three-cable photovoltaic flexible support.
[0048] Those skilled in the art will understand that the embodiments in this application can be provided as methods, systems, or computer program products. Therefore, the embodiments in this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the embodiments in this application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.
[0049] This application describes embodiments of methods, apparatus (systems), and computer program products according to embodiments of this application with reference to flowchart illustrations and / or block diagrams. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.
[0050] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.
[0051] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.
[0052] Although preferred embodiments have been described in this application, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the embodiments of this application.
[0053] Obviously, those skilled in the art can make various modifications and variations to the embodiments of this application without departing from the spirit and scope of the embodiments of this application. Therefore, if these modifications and variations to the embodiments of this application fall within the scope of this application and its equivalents, then these modifications and variations are also intended to be included in the embodiments of this application.
Claims
1. A method for adjusting the cable force of a three-cable photovoltaic flexible support, characterized in that, The method, applied in a controller for a three-cable photovoltaic flexible support system, includes: Obtain the structural property parameters and aerodynamic characteristic parameters of the system, as well as the air density of the environment in which the system is located; Based on the configured initial cable force values and the structural property parameters, calculate the structural dynamic parameters corresponding to each initial cable force value; Based on the initial cable force values, the structural property parameters, the structural dynamic parameters, the aerodynamic characteristic parameters, and the air density, calculate the flutter instability critical wind speed and the still wind instability critical wind speed corresponding to each initial cable force value. Based on the flutter instability critical wind speed and calm wind instability critical wind speed corresponding to each initial cable force value, and the configured screening rules, the target cable force value is obtained by screening from each initial cable force value; Adjust the tension of the load-bearing cable of the system according to the target cable tension value.
2. The method of claim 1, wherein, The three-cable photovoltaic flexible support system includes: multiple photovoltaic modules, a first support column, a second support column, and a cable tension adjustment mechanism; The load-bearing cable is tensioned and anchored between the first and second pillars; multiple photovoltaic modules are fixed to the load-bearing cable; The load-bearing cable includes: a first load-bearing cable, a second load-bearing cable, and a third load-bearing cable; the first load-bearing cable, the second load-bearing cable, and the third load-bearing cable are parallel; The cable tension adjustment mechanism is located between the end of the third load-bearing cable and the anchorage point of the first or second support column, and is used to adjust the cable tension of the third load-bearing cable.
3. The method of claim 2, wherein, The structural attribute parameters include: the geometric parameters of the photovoltaic module, the span of the photovoltaic module between the first and second pillars, the cable spacing between any two load-bearing cables, the ratio of the cable spacing to the width of the photovoltaic module, the structural parameters of the load-bearing cables, the cable force of the first and second load-bearing cables, the structural vertical bending damping ratio, and the structural torsional damping ratio. The aerodynamic characteristic parameters include: the derivative of the lift moment coefficient with respect to the wind angle of attack and the flutter derivative.
4. The method as described in claim 3, characterized in that, The structural dynamic parameters include: the natural frequency of vertical bending and the natural frequency of torsion. Based on the configured initial cable force values and the structural property parameters, the structural dynamic parameters corresponding to each initial cable force value are calculated, including: For any initial cable force value, the structural vertical bending natural frequency and structural torsional natural frequency of the initial cable force value are calculated based on the initial cable force value, the cable forces of the first weighing cable and the second load-bearing cable, the span of the photovoltaic module, the ratio of the cable spacing to the width of the photovoltaic module, the geometric parameters of the photovoltaic module, and the structural parameters of the load-bearing cable.
5. The method as described in claim 4, characterized in that, Based on the initial cable force values, the structural property parameters, structural dynamic parameters, aerodynamic characteristic parameters, and air density, calculate the flutter instability critical wind speed corresponding to each initial cable force value, including: For any initial cable force value, the critical wind speed for flutter instability of the initial cable force value is calculated based on the initial cable force value, the structural property parameters, the structural vertical bending natural frequency, the structural torsional natural frequency, the flutter derivative, and the air density.
6. The method as described in claim 4, characterized in that, Based on the initial cable force values, the structural property parameters, the structural dynamic parameters, the aerodynamic characteristic parameters, and the air density, calculate the critical wind speed for static wind instability corresponding to each initial cable force value, including: For any initial cable force value, the critical wind speed for static instability of the initial cable force value is calculated based on the cable forces of the first weighing cable and the second load-bearing cable, the initial cable force value, the span of the photovoltaic module, the ratio of the cable spacing to the width of the photovoltaic module, the geometric parameters of the photovoltaic module, the structural parameters of the load-bearing cable, the derivative of the lift moment coefficient with respect to the wind angle of attack, and the air density.
7. The method as described in claim 1, characterized in that, Based on the flutter instability critical wind speed and calm wind instability critical wind speed corresponding to each initial cable force value, and the configured screening rules, the target cable force values are selected from each initial cable force value, including: Each initial cable force value that meets the configured filtering rules is used as a candidate cable force value; The candidate cable force value with the largest flutter instability critical wind speed and calm wind instability critical wind speed is taken as the target cable force value.
8. A cable force adjustment device for a three-cable photovoltaic flexible support, characterized in that, The device, used in the controller of a three-cable photovoltaic flexible support system, includes: The acquisition unit is used to acquire the structural property parameters and aerodynamic characteristic parameters of the system, as well as the air density of the environment in which the system is located; The first calculation unit is used to calculate the structural dynamic parameters corresponding to each initial cable force value based on the configured multiple initial cable force values and the structural property parameters. The second calculation unit is used to calculate the flutter instability critical wind speed and the still wind instability critical wind speed corresponding to each initial cable force value based on each initial cable force value, the structural property parameters, the structural dynamic parameters, the aerodynamic characteristic parameters and the air density. The filtering unit is used to filter out the target cable force value from each initial cable force value according to the flutter instability critical wind speed and the calm wind instability critical wind speed corresponding to each initial cable force value and the configured filtering rules. An adjustment unit is used to adjust the cable force of the load-bearing cable of the three-cable photovoltaic flexible support system according to the target cable force value.
9. An electronic device, characterized in that, The electronic device includes a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory communicate with each other through the communication bus; Memory, used to store computer programs; A processor, when executing a program stored in memory, implements the method of any one of claims 1-7.
10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the method described in any one of claims 1-7.