A method for improving wind resistance performance of a photovoltaic support based on wind speed prediction and cable force adjustment

Abstract

The application provides a wind speed prediction and cable force adjustment based photovoltaic support wind resistance performance improvement method, and relates to the technical field of new energy facility wind resistance control. The method constructs a wind speed prediction, cable force adjustment and frequency ratio control logic, so that the flexible photovoltaic support has the ability to actively adjust the load cable force based on future wind conditions, avoids the weight and cost increment caused by the addition of rigid wind resistance components, and overcomes the defect that passive fixed cable force cannot respond to the time-varying characteristics of wind speed. By adjusting the cable force distribution relationship of the two load cables, the ratio of the torsional natural frequency to the vertical natural frequency of the flexible photovoltaic support structure changes, so that it is located in the preset value interval, thereby reducing the possibility of vertical-torsional coupled vibration, and improving the stability and wind resistance performance of the photovoltaic support structure under wind load.

Description

Technical Field

[0001] This invention relates to the field of wind resistance control technology for new energy facilities, and in particular to a method for improving the wind resistance performance of photovoltaic supports based on wind speed prediction and cable force adjustment. Background Technology

[0002] Flexible photovoltaic (PV) mounting systems are a new type of support structure that mounts PV modules onto prestressed cable structures. They typically consist of cable structures, end supports, central supports, and wind-resistant systems. Compared to traditional rigid PV mounting systems, flexible PV mounting systems offer advantages such as larger spans, higher clearance, and stronger adaptability to complex terrain, significantly improving land utilization efficiency. In recent years, they have been rapidly promoted and applied in PV power plant construction.

[0003] Currently, a widely used type of flexible photovoltaic (PV) support system in engineering is the single-layer two-cable flexible PV support system. Its structure typically involves fixing two tensioned steel cables to an end steel frame or foundation structure, with the PV modules directly mounted on these two tensioned cables. This type of structural system is relatively lightweight and has high structural flexibility. Its vertical vibration frequency is close to its torsional vibration frequency, making it prone to vertical-torsional coupled vibration under wind loads. This can induce large-scale divergent wind-induced vibrations, which in severe cases may affect structural safety and service reliability.

[0004] To address the aforementioned issues, existing wind-resistant measures for single-layer, two-cable flexible photovoltaic (PV) supports commonly used in engineering projects mainly include installing wind-resistant cables or arranging transverse stiffening trusses. Wind-resistant cables improve the overall stiffness of the system by constraining structural displacement, but their installation significantly increases the stress level at component connections, potentially causing damage or fatigue failure at connection nodes under strong wind vibrations. Furthermore, the placement of wind-resistant cables is usually limited by ground space conditions, restricting their installation location and quantity; when the number is small or the placement is restricted, their wind-resistant effect is difficult to fully realize. While transverse stiffening trusses can effectively suppress large wind vibration responses, they require a large amount of steel and have a high self-weight, increasing not only the overall structural weight and foundation burden but also significantly raising project costs and construction complexity, which is detrimental to the development requirements of lightweight and economical flexible PV supports. Summary of the Invention

[0005] The purpose of this invention is to provide a method for improving the wind resistance performance of photovoltaic support structures based on wind speed prediction and cable force adjustment, so as to improve the stability and wind resistance performance of photovoltaic support structures under wind loads without setting wind-resistant cables and without significantly increasing the self-weight of the structure.

[0006] In a first aspect, the present invention provides a method for improving the wind resistance performance of photovoltaic (PV) supports based on wind speed prediction and cable tension adjustment, comprising: processing historical wind speed data of the area surrounding a single-layer, two-cable flexible PV support using a preset wind speed prediction model to output a wind speed prediction sequence for the area surrounding the PV support within a preset future time window; determining whether the PV support meets a preset wind-resistant cable tension adjustment condition based on the wind speed prediction sequence and the ratio of the torsional natural frequency to the vertical natural frequency of the PV support under the current cable tension; and, if the condition is met, generating a cable tension adjustment command for the two load-bearing cables of the PV support and sending the command to a cable tension adjustment device located at the steel crossbeams at both ends of the PV support to drive the two load-bearing cables to perform tensioning operations respectively, thereby making the ratio of the torsional natural frequency to the vertical natural frequency of the PV support within a preset range, thereby suppressing the vertical-torsional coupled vibration of the PV support.

[0007] In an optional implementation, determining whether the photovoltaic support has met the preset windproof cable force adjustment condition based on the wind speed prediction sequence and the ratio of the torsional natural frequency to the vertical natural frequency of the photovoltaic support under the current cable force includes: if one of the following preset conditions exists in the wind speed prediction sequence, determining whether the ratio of the torsional natural frequency to the vertical natural frequency of the photovoltaic support under the current cable force is within a preset value range; wherein, the preset conditions include: the average value of the wind speed prediction sequence is greater than a first threshold, the wind speed value at N consecutive time points in the wind speed prediction sequence is greater than a second threshold, and N≥3; if not, determining that the photovoltaic support has met the preset windproof cable force adjustment condition; otherwise, determining that the photovoltaic support has not met the preset windproof cable force adjustment condition.

[0008] In an optional implementation, when the photovoltaic support reaches the preset windproof cable tension adjustment condition, the cable tension adjustment command includes: applying a first incremental tension to the windward side load-bearing cable and applying a second incremental tension to the leeward side load-bearing cable.

[0009] In an optional implementation, after the photovoltaic support adjusts the cable force based on the first increment and the second increment, the difference in cable force between the two load-bearing cables satisfies the preset asymmetry tolerance condition.

[0010] In an optional implementation, during the process of driving the two load-bearing cables to perform tensioning operations, the method further includes: receiving real-time data from the tilt angle sensor of the photovoltaic module and the deflection sensor of the steel column on the photovoltaic support; if the tilt angle deviation of the photovoltaic module is greater than a first preset threshold, or the change in deflection of the steel column is greater than a second preset threshold, then pausing the current cable force adjustment process and initiating a safety backoff strategy to restore the cable force to the state before adjustment.

[0011] In an optional implementation, after driving the two load-bearing cables to perform tensioning operations respectively, the method further includes: obtaining the current actual cable force of the two load-bearing cables of the photovoltaic support, and obtaining a first updated cable force and a second updated cable force; based on the first updated cable force and the second updated cable force, calculating the ratio of the torsional natural frequency to the vertical natural frequency of the photovoltaic support after cable force adjustment, and obtaining the actual frequency ratio; if the actual frequency ratio exceeds the preset value range, then restarting the cable force adjustment process until the ratio of the torsional natural frequency to the vertical natural frequency of the photovoltaic support is within the preset value range.

[0012] In an optional implementation, after driving the two load-bearing cables to perform tensioning operations respectively, the method further includes: if the preset situation does not exist in the wind speed prediction sequence of the area surrounding the photovoltaic support within a preset time window, generating a cable force recovery command for the two load-bearing cables of the photovoltaic support, and sending the command to the cable force adjustment device to drive the two load-bearing cables to perform relaxation operations respectively, thereby restoring the cable force of the two load-bearing cables to the state before the tensioning operation.

[0013] Secondly, the present invention provides a device for improving the wind resistance performance of a photovoltaic support structure based on wind speed prediction and cable tension adjustment, comprising: a prediction module, used to process historical wind speed data of the area surrounding a single-layer two-cable flexible photovoltaic support structure using a preset wind speed prediction model, to output a wind speed prediction sequence for the area surrounding the photovoltaic support structure within a preset future time window; a judgment module, used to determine whether the photovoltaic support structure has reached a preset wind-resistant cable tension adjustment condition based on the wind speed prediction sequence and the ratio of the torsional natural frequency to the vertical natural frequency of the photovoltaic support structure under the current cable tension; and an adjustment module, used to generate a cable tension adjustment command for the two load-bearing cables of the photovoltaic support structure when it is determined that the condition has been met, and send the command to a cable tension adjustment device located at the steel crossbeams at both ends of the photovoltaic support structure, so as to drive the two load-bearing cables to perform tensioning operations respectively, thereby making the ratio of the torsional natural frequency to the vertical natural frequency of the photovoltaic support structure within a preset value range, thereby suppressing the vertical-torsional coupled vibration of the photovoltaic support structure.

[0014] Thirdly, the present invention provides an electronic device, including a memory and a processor, wherein the memory stores a computer program that can run on the processor, and the processor executes the computer program to implement the method for improving the wind resistance performance of photovoltaic supports based on wind speed prediction and cable force adjustment as described in any of the foregoing embodiments.

[0015] Fourthly, the present invention provides a computer-readable storage medium storing computer instructions, which, when executed by a processor, implement the method for improving the wind resistance performance of photovoltaic supports based on wind speed prediction and cable tension adjustment as described in any of the foregoing embodiments.

[0016] This invention, by constructing control logic for wind speed prediction, cable force adjustment, and frequency ratio control, enables flexible photovoltaic (PV) supports to proactively adjust the load-bearing cable force based on future wind conditions. This avoids the increased weight and cost associated with adding rigid wind-resistant components and overcomes the limitation of passive fixed cable forces failing to respond to the time-varying characteristics of wind speed. By adjusting the cable force distribution relationship between the two load-bearing cables, the ratio of the torsional natural frequency to the vertical natural frequency of the flexible PV support structure is changed, keeping it within a preset range. This reduces the likelihood of vertical-torsional coupled vibrations and improves the stability and wind resistance of the PV support structure under wind loads. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 A flowchart illustrating a method for improving the wind resistance performance of photovoltaic supports based on wind speed prediction and cable tension adjustment, provided as an embodiment of the present invention; Figure 2 A schematic diagram of a single-layer two-cable flexible photovoltaic support provided in an embodiment of the present invention; Figure 3 Figures showing the critical wind speeds for different cable-force-induced instability obtained through two-dimensional and three-dimensional theoretical analysis methods; Figure 4 A functional block diagram of a photovoltaic support wind resistance performance improvement device based on wind speed prediction and cable force adjustment provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of an electronic device provided in an embodiment of the present invention. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0021] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0022] Example 1 Figure 1 A flowchart illustrating a method for improving the wind resistance of photovoltaic supports based on wind speed prediction and cable tension adjustment, as provided in this embodiment of the invention, is shown below. Figure 1 As shown, the method specifically includes the following steps: Step S102: The historical wind speed data of the area surrounding the single-layer two-cable flexible photovoltaic support is processed using a preset wind speed prediction model to output a wind speed prediction sequence for the area surrounding the photovoltaic support within a preset time window in the future.

[0023] In this embodiment of the invention, the preset wind speed prediction model does not specifically refer to a particular artificial intelligence algorithm, but rather to any tool capable of modeling and outputting short-term trends in wind speed data from a local area. Optionally, the preset wind speed prediction model is built based on an artificial intelligence algorithm, employing neural networks, machine learning, or a combination thereof to improve the accuracy and timeliness of wind speed prediction. The model input consists of historical wind speed data with temporal continuity collected from measuring points in the area surrounding the single-layer two-cable flexible photovoltaic support (hereinafter referred to as the photovoltaic support). The output is the estimated wind speed value (i.e., the wind speed prediction sequence) for that area within a preset future time window (e.g., 15 to 60 minutes). It should be noted that the aforementioned historical wind speed data refers to the recent measured sequence used for model inference (e.g., rolling window data from the past 10-30 minutes), rather than the long-term historical database used during the training phase, thereby ensuring that the prediction results reflect the true evolution of wind speed.

[0024] Step S104: Based on the wind speed prediction sequence and the ratio of the torsional natural frequency to the vertical natural frequency of the photovoltaic support under the current cable force, determine whether the photovoltaic support has met the preset windproof cable force adjustment conditions.

[0025] Specifically, the embodiments of the present invention adopt an active intervention logic that differs from traditional passive wind-resistant measures. Its judgment criteria have two dimensions: first, external excitation characteristics (the future wind load intensity and persistence characterized by the wind speed prediction sequence). The embodiments of the present invention use the wind speed prediction results as a reference for cable force adjustment, which can achieve more targeted cable force adjustment; second, internal structural state (the degree of coupling between torsional and vertical vibration modes determined by the current cable force). Among them, the ratio of the torsional natural frequency to the vertical natural frequency is a key parameter for measuring the tendency of a single-layer two-cable flexible photovoltaic support to undergo vertical-torsional coupled vibration.

[0026] Vertical natural frequency The formula is: .

[0027] Torsional natural frequency The formula is: .

[0028] in, and These represent the cable forces of the two load-bearing cables. Indicates the span of the photovoltaic system. This represents the mass per unit length of the photovoltaic system across the span, which consists of the weight of the supporting cables and the photovoltaic modules. This represents the rotational mass of the photovoltaic system per unit length along the span, and it consists of the weight of the supporting cables and the photovoltaic modules. This indicates the position of the first load-bearing cable (one of the two load-bearing cables) from the center of elasticity. , This indicates the position of the second load-bearing cable (the other of the two load-bearing cables) from the center of elasticity. , and The point of application of the resultant force is the center of elasticity. This represents the distance between the elastic center and the geometric center of the transverse cable connection system. , Indicates the cable spacing. This indicates the frequency order; if the first-order frequency is of interest, the value is 1.

[0029] This invention does not evaluate wind speed or frequency ratio (the ratio of torsional natural frequency to vertical natural frequency) in isolation, but rather couples them together as a trigger condition: adjustment is only considered necessary when the predicted wind environment poses a risk of triggering and the current structural dynamic characteristics are not yet suppressed. This dual-variable criterion of meteorology and structure fundamentally changes the previous design paradigm that relied solely on wind speed thresholds or fixed preload, and constitutes the technical judgment center of this invention.

[0030] In step S106, if the condition is determined to be met, a cable tension adjustment command is generated for the two load-bearing cables of the photovoltaic support, and the command is sent to the cable tension adjustment device set at the steel crossbeams at both ends of the photovoltaic support to drive the two load-bearing cables to perform tensioning operations respectively, thereby making the ratio of the torsional natural frequency to the vertical natural frequency of the photovoltaic support within a preset range, thereby suppressing the vertical-torsional coupled vibration of the photovoltaic support.

[0031] Figure 2 A schematic diagram of a single-layer two-cable flexible photovoltaic support provided in an embodiment of the present invention is shown below. Figure 2 As shown, the single-layer two-cable flexible photovoltaic support includes: two load-bearing cables 1, steel columns 2, multiple transverse connecting systems connecting the two load-bearing cables, steel crossbeams connecting the steel columns, and a cable tension adjustment device 4. Photovoltaic modules 3 are mounted between the transverse connecting systems. During installation, the two load-bearing cables are initially pre-tensioned according to design requirements, and after tensioning, they are connected and fixed to the steel crossbeams on both sides. Through initial cable tension setting and subsequent cable tension adjustment, the ratio of the structure's torsional natural frequency to its vertical natural frequency is controlled within a preset range, preferably less than 1.1, thereby improving the wind resistance performance of the flexible photovoltaic support.

[0032] refer to Figure 2 This invention provides cable tension adjustment devices at the two end beams of a single-layer, two-cable flexible photovoltaic support structure. These devices include hydraulic jacks or a jack assembly of multiple hydraulic jacks, used to tension or loosen the load-bearing cables, thereby achieving real-time adjustment of the cable tension. By adjusting the cable tension, the overall stiffness of the flexible photovoltaic support system can be improved without significantly increasing the structure's self-weight, and active control of the structure's inherent vibration characteristics can be achieved. This invention does not specify a particular number of cable tension adjustment devices. Figure 2 Each load-bearing cable is equipped with a cable tension adjustment device at both ends. Alternatively, a cable tension adjustment device can be installed at only one end to achieve the purpose of cable tension adjustment.

[0033] In this embodiment of the invention, the cable tension adjustment command is a control signal generated for two physically independent cable tension adjustment devices (corresponding to two load-bearing cables respectively). Its content includes the target cable tension value or the target cable tension increment, but it does not require the two devices to act simultaneously or complete synchronously. As long as it is within the engineering-acceptable command response time window (which is determined by the structural dynamic response characteristics and the performance of the cable tension adjustment device), the two load-bearing cables can achieve the tension state set by the command, which is considered as the execution being completed.

[0034] In this embodiment of the invention, the emphasis in performing tensioning operations is on the independence of the object being adjusted and the certainty of the direction of movement. Figure 3The diagram shows the critical wind speeds for wind-induced instability under different cable forces, obtained through two-dimensional and three-dimensional theoretical analysis methods. Under wind-resistant conditions, increasing the cable forces of the two load-bearing cables is essential to enhance the overall structural stiffness, which is the fundamental means of suppressing low-frequency large-amplitude vibrations. The fact that the frequency ratio falls within a preset range indicates that the ultimate goal of this adjustment is to actively optimize the structural dynamic characteristics. The preset range (for example, greater than 0.8 and less than 1.1) is not a static design constraint, but rather a dynamic wind resistance performance envelope set for predicted wind conditions.

[0035] This invention, through the construction of control logic encompassing wind speed prediction, cable force adjustment, and frequency ratio control, enables flexible photovoltaic (PV) supports to proactively adjust the load-bearing cable force based on future wind conditions. This avoids the increased weight and cost associated with adding rigid wind-resistant components and overcomes the limitation of passively fixed cable forces failing to respond to the time-varying characteristics of wind speed. By adjusting the cable force distribution relationship between the two load-bearing cables, the ratio of the torsional natural frequency to the vertical natural frequency of the flexible PV support structure is changed, keeping it within a preset range. This reduces the likelihood of vertical-torsional coupled vibrations and improves the stability and wind resistance of the PV support structure under wind loads.

[0036] In an optional implementation, step S104 above, based on the wind speed prediction sequence and the ratio of the torsional natural frequency to the vertical natural frequency of the photovoltaic support under the current cable force, determines whether the photovoltaic support has met the preset windproof cable force adjustment conditions, specifically including the following: If any of the following preset conditions exist in the wind speed prediction sequence, then determine whether the ratio of the torsional natural frequency to the vertical natural frequency of the photovoltaic support under the current cable force is within the preset value range; wherein, the preset conditions include: the average value of the wind speed prediction sequence is greater than the first threshold, the wind speed value at N consecutive time points in the wind speed prediction sequence is greater than the second threshold, and N≥3.

[0037] If not, then it is determined that the photovoltaic support has met the preset windproof cable tension adjustment conditions.

[0038] Otherwise, it is determined that the photovoltaic support has not met the preset windproof cable tension adjustment conditions.

[0039] Specifically, after obtaining the wind speed prediction sequence, the first step is to identify risk patterns. The first type is overall intensity risk: the arithmetic mean of the sequence is calculated. If it exceeds a first threshold, it indicates a significant increase in average wind energy input over a future period, leading to a rise in the energy level of airflow excitation on the structure and an increased probability of coupled instability. The second type is continuous impact risk: examining whether there are multiple consecutive time points in the sequence where the instantaneous (or short-term average) wind speed values ​​are all higher than the second threshold. This pattern simulates gusts or prolonged periods of strong winds, making it more likely to induce cumulative structural fatigue and large-scale vibrations. In the aforementioned "N consecutive time points," N is an integer greater than or equal to 3. Its physical meaning is to exclude accidental single-point pulse interference, ensuring that the identified wind load process has engineering significance. The time point interval is determined by the wind speed sampling period (e.g., 5 minutes / point). Under this setting, N=3 represents at least 15 minutes of continuous high wind periods.

[0040] If one of the above risks is confirmed, it is necessary to further assess whether the dynamic stability of the single-layer two-cable flexible support meets the standard. Specifically, it is necessary to determine whether the ratio of the torsional natural frequency to the vertical natural frequency of the photovoltaic support under the current cable force is within the preset range. If not, it indicates that the support structure faces both enhanced external excitation and a lack of internal dynamic stability assurance, resulting in a double risk, necessitating cable force adjustment. Otherwise, although wind speed forecasts indicate risk, if the current frequency ratio is within the safe range, it means that the existing cable force configuration is sufficient to handle this type of wind condition, and no additional intervention is required.

[0041] In one alternative implementation, when the photovoltaic support reaches the preset wind-resistant cable tension adjustment condition, the cable tension adjustment command includes: applying a first incremental tension to the windward-facing load-bearing cable and applying a second incremental tension to the leeward-facing load-bearing cable.

[0042] Specifically, the windward and leeward load-bearing cables refer to the spatial orientation of two load-bearing cables determined in real time based on wind vane or combined wind speed and direction monitoring data under the current prevailing wind direction. Since flexible photovoltaic supports have a fixed orientation, while wind direction continuously changes, the windward and leeward sides are not inherent attributes of the support, but rather transient state indicators that are dynamically updated over time. This identification can be determined simply by the trigonometric relationship between the wind direction angle at the measuring point and the geometric axis of the support. For example, when the angle between the wind direction angle and the normal of the long side of the support is less than 45°, the side directly opposite it is defined as the windward side.

[0043] The aforementioned first and second increments refer to the increase in tension amplitude relative to the current measured cable force value, and their magnitudes can be calculated by the control system based on a preset adjustment model. The inputs to this model include: the current measured cable forces of the two cables, the average value of the predicted wind speed sequence or the high-speed wind speed value over a short period (N consecutive time points), wind direction, and the target range for the torsional / vertical natural frequency ratio; the model's output is the adjusted cable forces of the two cables, with the aim of driving the frequency ratio into a preset value range. In this embodiment of the invention, the first and second increments are not required to be equal in value, nor is it preset that one increment must necessarily be larger; their relative magnitudes depend on the direction of deviation between the current cable force distribution and the target frequency ratio.

[0044] In one alternative implementation, after the photovoltaic support is adjusted based on the first increment and the second increment, the difference in cable force between the two load-bearing cables satisfies the preset asymmetry tolerance condition.

[0045] Given that the two load-bearing cables of a single-layer, two-cable flexible support are anchored at both ends of the same steel beam, when the difference in cable tension is significant, the beam will bear additional torque and eccentric pressure, potentially leading to weld cracking, bolt loosening, and other problems. Therefore, to prevent unintended stress states in the end support system caused by excessive tension imbalance between the two load-bearing cables during cable tension adjustment, this invention proposes a preset asymmetry tolerance condition to ensure that dynamic performance optimization does not come at the expense of static safety.

[0046] Specifically, the cable force difference refers to the absolute difference between the measured cable forces of the two load-bearing cables after adjustment, while the preset asymmetry tolerance condition is a dimensionless limit defined by the ratio of this difference to the average cable force of the two cables, i.e. , This indicates the preset upper limit of tolerance. Its value is not an empirical value, but a value obtained through conventional structural calculations based on the cross-sectional characteristics of the beam, the connection structure, the allowable stress of the material, and the safety factor.

[0047] In an optional embodiment, during the process of driving the two load-bearing cables to perform tensioning operations, the present invention further includes the following: It receives real-time data from the tilt sensor of the photovoltaic module and the deflection sensor of the steel column on the photovoltaic support.

[0048] If the tilt angle deviation of the photovoltaic module is greater than the first preset threshold, or the change in deflection of the steel column is greater than the second preset threshold, the current cable force adjustment process will be paused and a safety rollback strategy will be initiated to restore the cable force to the state before adjustment.

[0049] Given that changes in cable force during the tensioning process of flexible photovoltaic supports are instantaneously transmitted to the entire structural system, potentially inducing observable macroscopic deformations such as abrupt changes in module angle and increased lateral displacement of the columns, relying solely on preset models and open-loop commands while ignoring the real-time mechanical feedback of the actual structure poses a risk of adjustment overload, local instability, or even sudden failure. Therefore, to place this active control behavior of cable force adjustment under the direct constraints of the structural physical response, this embodiment of the invention deploys distributed physical sensors: photovoltaic module tilt angle sensors and steel column deflection sensors.

[0050] Specifically, changes in the tilt angle of photovoltaic modules can directly reflect the overall torsion and vertical lifting trend of the upper load-bearing cable system. When the tension of the left and right cables is not coordinated or the increase is too large, the plane of the module is prone to rotate around the long side axis, causing the power generation surface to deviate from the optimal tilt angle. This phenomenon is not only an early manifestation of structural abnormalities, but also a direct indicator affecting the operating efficiency of the power station. On the other hand, changes in the deflection of the steel column characterize the lateral stiffness response of the lower support system under the action of cable force redistribution. A sudden increase in this often indicates that the foundation connection is loose, the column buckling critical point is approaching, or the overall structure has entered the nonlinear deformation zone.

[0051] If the tilt angle deviation of the photovoltaic module exceeds the first preset threshold, it indicates that the absolute value of the difference between the current measured tilt angle of the module and its reference tilt angle under steady-state conditions before adjustment exceeds the set limit. Similarly, if the deflection change of the steel column exceeds the second preset threshold, it indicates that the increment of the horizontal displacement of the top of the steel column relative to the initial value after adjustment is initiated exceeds the set limit. In any of the above situations, all ongoing cable force increment output commands should be immediately stopped, the current operation of the adjustment device should be frozen, and the cable force of the two load-bearing cables should be released to the initial value before the cable force adjustment began.

[0052] This is because the state before cable tension adjustment is a safe baseline condition that has been verified through long-term operation, and its dynamic characteristics and static response are known and stable; while any intermediate state is a temporary transition and lacks safety guarantees. Therefore, reverting to the initial state is the most conservative, reliable, and easily implemented fault recovery method, which avoids the risk of continuing adjustment in an unknown state and provides a clean starting point for subsequent diagnosis and replanning.

[0053] In an optional embodiment, after the two load-bearing cables are tensioned, the present invention further includes the following: Obtain the current actual cable force of the two load-bearing cables of the photovoltaic support, and obtain the first updated cable force and the second updated cable force.

[0054] Based on the first and second renewal cable forces, the ratio of the torsional natural frequency to the vertical natural frequency of the photovoltaic support after cable force adjustment is calculated to obtain the actual frequency ratio.

[0055] If the actual frequency ratio exceeds the preset range, the cable tension adjustment process will be restarted until the ratio of the torsional natural frequency to the vertical natural frequency of the photovoltaic support is within the preset range.

[0056] As described above, this invention constructs a closed-loop feedback control loop based on measured cable force to overcome the inherent deviation between the theoretical model and the actual structure, ensuring that the active intervention of cable force adjustment ultimately achieves the predetermined dynamic goal. In real-world service environments, flexible photovoltaic supports are affected by factors such as material creep, temperature changes, connection slippage, and sensor calibration errors. The applied cable force increment may not accurately translate into the theoretically expected frequency ratio change. Relying solely on open-loop commands may lead to adjustment failure due to accumulated errors. Therefore, this invention further utilizes a standard negative feedback structure of "measurement → calculation → comparison → readjustment" to elevate the control process from experience-driven to data-driven, fundamentally ensuring the certainty and robustness of the wind resistance performance improvement.

[0057] In an optional embodiment, after the two load-bearing cables are tensioned, the present invention further includes the following: If the wind speed prediction sequence for the area surrounding the photovoltaic support does not contain the preset situation within the preset time window, a cable tension recovery command is generated for the two load-bearing cables of the photovoltaic support. This command is then sent to the cable tension adjustment device to drive the two load-bearing cables to perform relaxation operations, thereby restoring the cable tension of the two load-bearing cables to the state before the tensioning operation.

[0058] It is known that the load-bearing cables of a single-layer, two-cable flexible support system are prone to degradation phenomena such as stress relaxation, creep accumulation, and accelerated corrosion under continuous high stress; critical components such as end anchoring nodes and crossbeam welds can also suffer micro-damage due to long-term eccentric stress. Maintaining the adjusted high cable tension after wind speed decreases and the risk of instability is eliminated is not only unhelpful for wind resistance but also shortens the structure's service life and increases maintenance costs. Therefore, to avoid the flexible photovoltaic support system maintaining a high cable tension state for extended periods under non-high wind conditions, thus balancing short-term wind resistance requirements with long-term structural reliability, this invention proposes a cable tension recovery mechanism.

[0059] Specifically, after completing the tensioning operation, the control system continuously calls the wind speed prediction model to make rolling predictions for subsequent periods. If it is determined that the newly generated prediction sequence no longer meets any of the wind speed risk patterns defined above—that is, there is neither a significant increase in average wind speed nor a cluster of high wind speeds at multiple consecutive time points—then the meteorological risk is determined to be eliminated, and the cable tension recovery process can be initiated. This is essentially the reverse process of the tensioning operation, thereby restoring the cable tension of the two load-bearing cables to the state before the tensioning operation. Restoring to this state means that the structure has completely returned to the dynamic characteristics and static distribution before adjustment, eliminating the long-term degradation risk caused by high cable tension while retaining the original design margin, preparing for the next wind condition warning. This strategy avoids the calibration deviation that may be caused by restoring to a certain theoretical design value, and also avoids the uncertainty of the state caused by maintaining partial tension. It is the most reliable and simplest engineering implementation method using measured data as the anchor point.

[0060] Example 2 This invention also provides a device for improving the wind resistance performance of photovoltaic supports based on wind speed prediction and cable tension adjustment. This device is mainly used to execute the method for improving the wind resistance performance of photovoltaic supports based on wind speed prediction and cable tension adjustment provided in Embodiment 1 above. The following is a detailed description of the device for improving the wind resistance performance of photovoltaic supports based on wind speed prediction and cable tension adjustment provided in this invention.

[0061] Figure 4 A functional block diagram of a photovoltaic support wind resistance performance improvement device based on wind speed prediction and cable tension adjustment provided in an embodiment of the present invention is shown below. Figure 4 As shown, the device mainly includes: a prediction module 10, a judgment module 20, and an adjustment module 30, wherein: The prediction module 10 is used to process the historical wind speed data of the area surrounding the single-layer two-cable flexible photovoltaic support using a preset wind speed prediction model, so as to output the wind speed prediction sequence of the area surrounding the photovoltaic support within a preset time window in the future.

[0062] The judgment module 20 is used to determine whether the photovoltaic support has reached the preset windproof cable force adjustment conditions based on the wind speed prediction sequence and the ratio of the torsional natural frequency to the vertical natural frequency of the photovoltaic support under the current cable force.

[0063] The adjustment module 30 is used to generate a cable tension adjustment command for the two load-bearing cables of the photovoltaic support when the condition is determined, and send the command to the cable tension adjustment device set at the steel crossbeams at both ends of the photovoltaic support to drive the two load-bearing cables to perform tensioning operations respectively, so that the ratio of the torsional natural frequency to the vertical natural frequency of the photovoltaic support is within a preset range, thereby suppressing the vertical-torsional coupled vibration of the photovoltaic support.

[0064] This invention, through the construction of control logic encompassing wind speed prediction, cable force adjustment, and frequency ratio control, enables flexible photovoltaic (PV) supports to proactively adjust the load-bearing cable force based on future wind conditions. This avoids the increased weight and cost associated with adding rigid wind-resistant components and overcomes the limitation of passively fixed cable forces failing to respond to the time-varying characteristics of wind speed. By adjusting the cable force distribution relationship between the two load-bearing cables, the ratio of the torsional natural frequency to the vertical natural frequency of the flexible PV support structure is changed, keeping it within a preset range. This reduces the likelihood of vertical-torsional coupled vibrations and improves the stability and wind resistance of the PV support structure under wind loads.

[0065] Optionally, the judgment module 20 is specifically used for: If any of the following preset conditions exist in the wind speed prediction sequence, then determine whether the ratio of the torsional natural frequency to the vertical natural frequency of the photovoltaic support under the current cable force is within the preset value range; wherein, the preset conditions include: the average value of the wind speed prediction sequence is greater than the first threshold, the wind speed value at N consecutive time points in the wind speed prediction sequence is greater than the second threshold, and N≥3.

[0066] If not, then it is determined that the photovoltaic support has met the preset windproof cable tension adjustment conditions.

[0067] Otherwise, it is determined that the photovoltaic support has not met the preset windproof cable tension adjustment conditions.

[0068] Optionally, when the photovoltaic support reaches the preset wind-resistant cable tension adjustment condition, the cable tension adjustment command includes: applying a first incremental tension to the windward side load-bearing cable and applying a second incremental tension to the leeward side load-bearing cable.

[0069] Optionally, after the photovoltaic support adjusts the cable force based on the first increment and the second increment, the difference in cable force between the two load-bearing cables satisfies the preset asymmetry tolerance condition.

[0070] Optionally, during the process of driving the two load-bearing cables to perform tensioning operations, the device is also used for: It receives real-time data from the tilt sensor of the photovoltaic module and the deflection sensor of the steel column on the photovoltaic support.

[0071] If the tilt angle deviation of the photovoltaic module is greater than the first preset threshold, or the change in deflection of the steel column is greater than the second preset threshold, the current cable force adjustment process will be paused and a safety rollback strategy will be initiated to restore the cable force to the state before adjustment.

[0072] Optionally, after the two load-bearing cables are tensioned, the device is also used for: Obtain the current actual cable force of the two load-bearing cables of the photovoltaic support, and obtain the first updated cable force and the second updated cable force.

[0073] Based on the first and second renewal cable forces, the ratio of the torsional natural frequency to the vertical natural frequency of the photovoltaic support after cable force adjustment is calculated to obtain the actual frequency ratio.

[0074] If the actual frequency ratio exceeds the preset range, the cable tension adjustment process will be restarted until the ratio of the torsional natural frequency to the vertical natural frequency of the photovoltaic support is within the preset range.

[0075] Optionally, after the two load-bearing cables are tensioned, the device is also used for: If the wind speed prediction sequence for the area surrounding the photovoltaic support does not contain the preset situation within the preset time window, a cable tension recovery command is generated for the two load-bearing cables of the photovoltaic support. This command is then sent to the cable tension adjustment device to drive the two load-bearing cables to perform relaxation operations, thereby restoring the cable tension of the two load-bearing cables to the state before the tensioning operation.

[0076] Example 3 See Figure 5 This invention provides an electronic device, which includes a processor 60, a memory 61, a bus 62, and a communication interface 63. The processor 60, the communication interface 63, and the memory 61 are connected via the bus 62. The processor 60 is used to execute executable modules, such as computer programs, stored in the memory 61.

[0077] The memory 61 may include high-speed random access memory (RAM) or non-volatile memory, such as at least one disk storage device. Communication between this system network element and at least one other network element is achieved through at least one communication interface 63 (which can be wired or wireless), such as the Internet, wide area network, local area network, metropolitan area network, etc.

[0078] Bus 62 can be an ISA bus, PCI bus, or EISA bus, etc. The bus can be divided into address bus, data bus, control bus, etc. For ease of representation, Figure 5 The symbol is represented by a single double-headed arrow, but this does not mean that there is only one bus or one type of bus.

[0079] The memory 61 is used to store programs. After receiving an execution instruction, the processor 60 executes the program. The method executed by the apparatus defined by the process disclosed in any of the foregoing embodiments of the present invention can be applied to the processor 60 or implemented by the processor 60.

[0080] Processor 60 may be an integrated circuit chip with signal processing capabilities. In implementation, each step of the above method can be completed by the integrated logic circuitry in the hardware of processor 60 or by instructions in software form. Processor 60 can be a general-purpose processor, including a Central Processing Unit (CPU), a Network Processor (NP), etc.; it can also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field-Programmable Gate Array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of this invention. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the methods disclosed in the embodiments of this invention can be directly embodied in the execution of a hardware decoding processor, or executed by a combination of hardware and software modules in the decoding processor. The software modules can reside in random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, or other mature storage media in the art. The storage medium is located in memory 61. Processor 60 reads the information in memory 61 and, in conjunction with its hardware, completes the steps of the above method.

[0081] The computer program product of the method for improving the wind resistance performance of photovoltaic brackets based on wind speed prediction and cable tension adjustment provided in this embodiment of the invention includes a computer-readable storage medium storing non-volatile program code executable by a processor. The instructions included in the program code can be used to execute the methods described in the preceding method embodiments. For specific implementation, please refer to the method embodiments, which will not be repeated here.

[0082] In addition, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0083] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a processor-executable, non-volatile, computer-readable storage medium. Based on this understanding, the technical solution of this invention, essentially, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0084] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0085] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0086] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0087] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0088] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for improving the wind resistance performance of photovoltaic supports based on wind speed prediction and cable tension adjustment, characterized in that, include: Historical wind speed data of the area surrounding a single-layer, two-cable flexible photovoltaic support are processed using a preset wind speed prediction model to output a wind speed prediction sequence for the area surrounding the photovoltaic support within a preset future time window. Based on the wind speed prediction sequence and the ratio of the torsional natural frequency to the vertical natural frequency of the photovoltaic support under the current cable force, it is determined whether the photovoltaic support has met the preset windproof cable force adjustment conditions. Once the desired conditions are met, a cable tension adjustment command is generated for the two load-bearing cables of the photovoltaic support, and this command is sent to the cable tension adjustment device located at the steel crossbeams at both ends of the photovoltaic support to drive the two load-bearing cables to perform tensioning operations respectively, thereby making the ratio of the torsional natural frequency to the vertical natural frequency of the photovoltaic support within a preset range, thereby suppressing the vertical-torsional coupled vibration of the photovoltaic support.

2. The method for improving the wind resistance performance of photovoltaic supports based on wind speed prediction and cable tension adjustment according to claim 1, characterized in that, Based on the wind speed prediction sequence and the ratio of the torsional natural frequency to the vertical natural frequency of the photovoltaic support under the current cable force, it is determined whether the photovoltaic support has met the preset wind-resistant cable force adjustment conditions, including: If any of the following preset conditions exist in the wind speed prediction sequence, then determine whether the ratio of the torsional natural frequency to the vertical natural frequency of the photovoltaic support under the current cable force is within a preset value range; wherein, the preset conditions include: the average value of the wind speed prediction sequence is greater than a first threshold, and the wind speed value at N consecutive time points in the wind speed prediction sequence is greater than a second threshold, where N≥3; If not, then it is determined that the photovoltaic support has met the preset windproof cable force adjustment condition; Otherwise, it is determined that the photovoltaic support has not met the preset windproof cable force adjustment conditions.

3. The method for improving the wind resistance performance of photovoltaic supports based on wind speed prediction and cable tension adjustment according to claim 1, characterized in that, Once the photovoltaic support is determined to meet the preset windproof cable tension adjustment conditions, the cable tension adjustment command includes: applying a first incremental tension to the windward-facing load-bearing cable and applying a second incremental tension to the leeward-facing load-bearing cable.

4. The method for improving the wind resistance performance of photovoltaic supports based on wind speed prediction and cable tension adjustment according to claim 3, characterized in that, After the photovoltaic support is adjusted based on the first increment and the second increment, the difference in cable force between the two load-bearing cables meets the preset asymmetry tolerance condition.

5. The method for improving the wind resistance performance of photovoltaic supports based on wind speed prediction and cable tension adjustment according to claim 1, characterized in that, The process of driving the two load-bearing cables to perform tensioning operations also includes: Real-time reception of tilt angle sensor data for photovoltaic modules and deflection sensor data for steel columns on the photovoltaic support; If the tilt angle deviation of the photovoltaic module is greater than the first preset threshold, or the change in deflection of the steel column is greater than the second preset threshold, the current cable force adjustment process is paused and a safety rollback strategy is initiated to restore the cable force to the state before adjustment.

6. The method for improving the wind resistance performance of photovoltaic supports based on wind speed prediction and cable tension adjustment according to claim 1, characterized in that, After the two load-bearing cables are tensioned, the process also includes: Obtain the current actual cable force of the two load-bearing cables of the photovoltaic support, and obtain the first updated cable force and the second updated cable force; Based on the first and second updated cable forces, the ratio of the torsional natural frequency to the vertical natural frequency of the photovoltaic support after cable force adjustment is calculated to obtain the actual frequency ratio. If the actual frequency ratio exceeds the preset value range, the cable force adjustment process is restarted until the ratio of the torsional natural frequency to the vertical natural frequency of the photovoltaic bracket is within the preset value range.

7. The method for improving the wind resistance performance of photovoltaic supports based on wind speed prediction and cable tension adjustment according to claim 2, characterized in that, After the two load-bearing cables are tensioned, the process also includes: If the preset situation does not exist in the wind speed prediction sequence of the area surrounding the photovoltaic support within a preset time window, a cable tension recovery command is generated for the two load-bearing cables of the photovoltaic support, and the command is sent to the cable tension adjustment device to drive the two load-bearing cables to perform relaxation operations respectively, thereby restoring the cable tension of the two load-bearing cables to the state before the tensioning operation.

8. A device for improving the wind resistance performance of photovoltaic supports based on wind speed prediction and cable tension adjustment, characterized in that, include: The prediction module is used to process historical wind speed data of the area surrounding the single-layer two-cable flexible photovoltaic support using a preset wind speed prediction model, so as to output the wind speed prediction sequence of the area surrounding the photovoltaic support within a preset time window in the future. The judgment module is used to determine whether the photovoltaic support has reached the preset windproof cable force adjustment condition based on the wind speed prediction sequence and the ratio of the torsional natural frequency to the vertical natural frequency of the photovoltaic support under the current cable force. The adjustment module is used to generate a cable tension adjustment command for the two load-bearing cables of the photovoltaic support when the condition is determined, and send the command to the cable tension adjustment device set at the steel crossbeams at both ends of the photovoltaic support to drive the two load-bearing cables to perform tensioning operations respectively, thereby making the ratio of the torsional natural frequency to the vertical natural frequency of the photovoltaic support within a preset range, thereby suppressing the vertical-torsional coupled vibration of the photovoltaic support.

9. An electronic device comprising a memory and a processor, wherein the memory stores a computer program executable on the processor, characterized in that, When the processor executes the computer program, it implements the method for improving the wind resistance performance of photovoltaic supports based on wind speed prediction and cable force adjustment as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions, which, when executed by a processor, implement the method for improving the wind resistance performance of photovoltaic supports based on wind speed prediction and cable tension adjustment as described in any one of claims 1 to 7.

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