A controllable flexible photovoltaic support and control method

Abstract

The present invention discloses a controllable flexible photovoltaic support and a control method, which includes a support main body, a rigid rope traction mechanism and a base. The support main body is connected to the base through the rigid rope traction mechanism, and a photovoltaic panel is arranged on the front side of the support main body; a first air flow channel and a second air flow channel are arranged on the support main body. The second air outlet of the first air flow channel and the first air outlet of the second air flow channel are both connected to a hollow connecting rod, and a guiding hole which is slidably matched with the hollow connecting rod is arranged on the base. The hollow connecting rod is connected to an elastic airbag; and steps such as S1 - S4 are also included. The photovoltaic support of the present invention can be adaptively adjusted according to the wind force, enhancing the resistance and adaptability to harsh weather such as strong wind in the working environment of photovoltaic power generation. At the same time, based on the control method, an over-limit strong wind protection measure is taken for the photovoltaic support, providing an innovative design scheme for the flexible photovoltaic support in the new energy photovoltaic field.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore photovoltaic technology, and particularly relates to a controllable flexible photovoltaic support and a control method. Background Art

[0002] In the field of new energy, photovoltaic power generation is playing an increasingly important role. At the same time, with the continuous progress of related photovoltaic module production technology, its production cost is gradually decreasing, and the application scope and scenarios of photovoltaic power generation are becoming broader. However, in practical applications, the photovoltaic power generation industry is also facing some challenges.

[0003] Traditional rigid photovoltaic supports occupy a large amount of land resources and damage vegetation, easily causing waste of cultivated land resources and overuse of steel, which goes against the concept of green environmental protection. On the premise of not affecting the functions of the photovoltaic support, in order to simplify the structure of the photovoltaic support, the photovoltaic power generation industry generally conducts research and design on flexible photovoltaic supports. Photovoltaic power generation in China mainly focuses on the central and western regions, and the working environments are mainly mountainous areas, plateaus, near-shore areas and other areas with sufficient sunshine time. And strong convective weather such as strong winds often occurs in these areas. Therefore, in the design and production of flexible photovoltaic supports, it is necessary to enhance their wind resistance ability to fully protect the photovoltaic panels, so as to ensure the normal operation of photovoltaic power generation.

[0004] Existing flexible photovoltaic supports are generally cable-supported photovoltaic supports, which use a suspension cable structure to support multiple photovoltaic panels in series, reducing the weight of the overall system, improving the power generation efficiency and light utilization rate, and at the same time simplifying the structure and enhancing flexibility. However, there are still some problems as follows:

[0005] 1. The existing suspension cable structure has limited wind resistance ability, and will vibrate or even turn over and deform in the face of strong wind weather, seriously affecting the reliability and stability of photovoltaic power generation;

[0006] 2. The role of the control system and the control algorithm for auxiliary protection of the flexible photovoltaic support in the process of photovoltaic power generation is ignored or weakened;

[0007] 3. The design of the structure form of the photovoltaic support is relatively limited and the function is single, and it is impossible to ensure the working position accuracy of each photovoltaic panel during photovoltaic power generation;

[0008] 4. There is a lack of an overall control method for the working process of the flexible photovoltaic support, and it is impossible to ensure real-time monitoring of the working status of each photovoltaic support. Summary of the Invention

[0009] In view of the above deficiencies of the prior art, the present invention provides a controllable flexible photovoltaic support and its control method. The photovoltaic support can be adjusted adaptively according to the wind force, enhancing the resistance ability and adaptability to the working environment of photovoltaic power generation, especially harsh weather such as strong winds, and at the same time providing over-limit strong wind protection for the photovoltaic support based on the control method.

[0010] To achieve the above-mentioned invention purposes, the technical solution adopted by the present invention is as follows:

[0011] Provide a controllable flexible photovoltaic support, including a support main body, a rigid rope traction mechanism and a base. The support main body is connected to the base through the rigid rope traction mechanism, and a photovoltaic panel is arranged on the front side of the support main body; a first air flow channel and a second air flow channel are arranged on the support main body. The second air outlet of the first air flow channel and the first air outlet of the second air flow channel are both connected with a hollow connecting rod. A guiding hole which is slidably matched with the hollow connecting rod is arranged on the base. The guiding hole is connected with an air bag cavity, and an elastic air bag is arranged in the air bag cavity. One end of the elastic air bag is hermetically communicated with the hollow connecting rod.

[0012] Furthermore, the rigid rope traction mechanism includes two rigid ropes, a traction support and a controller. One end of the rigid rope is fixedly connected to the support main body and the other end is connected to the traction support. A cylindrical installation cavity which is matched with the rigid rope is arranged on the traction support. A plurality of electromagnets are arranged in the cylindrical installation cavity. The electromagnets are electrically connected to the controller. The electromagnets are used for adsorbing and fixing the rigid rope, and the controller is used for controlling the electromagnets.

[0013] Furthermore, the electromagnets include a first electromagnet, a second electromagnet and a third electromagnet, and the first electromagnet, the second electromagnet and the third electromagnet are sequentially arranged at the inlet end of the cylindrical installation cavity.

[0014] Furthermore, an iron ring which is matched with the electromagnet is arranged at the adsorption end of the rigid rope.

[0015] Furthermore, a pressure sensor is arranged in the middle of each rigid rope.

[0016] Furthermore, the middle parts of the first air flow channel and the second air flow channel are cross-connected and communicated.

[0017] Furthermore, the elastic air bag is in a bellows shape. One end of the elastic air bag is closed and the other end is provided with a connection hole which is matched with the hollow connecting rod.

[0018] Furthermore, a plurality of mounting rods are arranged at the bottom of the support main body.

[0019] Furthermore, the first air inlet of the first air flow channel and the second air inlet of the second air flow channel are both arranged on the upper side of the back of the support main body.

[0020] A control method for a controllable flexible photovoltaic support includes the following steps:

[0021] S1. After the flexible photovoltaic support starts to work, the pressure sensor detects the tensile force data of the rigid rope and sends the real-time tensile force data to the controller;

[0022] S2. Calculate the distance difference through the over-limit wind force protection modelδ Specifically, the over-limit wind force protection model is as follows:

[0023] ;

[0024] Among them, x is the elastic deformation of the rigid rope, F is the tension measured by the pressure sensor on the rigid rope, k is the Hooke's coefficient of the rigid rope; a is the distance from the intersection of the rear side of the base in the vertical direction and the traction bracket to the top mounting point of the connecting rod, b is the effective working length of the connecting rod, d is the working length of the bracket body, L is the distance between the rigid rope connection point and the intersection of the straight line where the axis of the hollow connecting rod and the axis of the rigid rope; is the distance from the intersection of the bracket body and the axis of the hollow connecting rod in the normal state to the intersection of the axis of the hollow connecting rod and the axis of the rigid rope, s is the distance from the intersection of the bracket body and the axis of the hollow connecting rod during work to the intersection of the axis of the hollow connecting rod and the axis of the rigid rope;

[0025] S3. Set the start difference of the first-level protection state as δ 1. The start difference of the second-level protection state is δ 2. The start difference of the third-level protection state is δ 3. Determine the working difference range corresponding to the electromagnets in several protection states, where ;

[0026] S4. The controller compares the distance difference δ obtained in step S2 with the set working difference range corresponding to the electromagnets, and obtains the working conditions and the number of working electromagnets; Specifically:

[0027] When the distance difference the controller does not issue an instruction, and automatically adjusts the flexible photovoltaic bracket body through the rigid rope and the elastic airbag;

[0028] When the distance difference the controller issues an instruction to control one of the first electromagnet, the second electromagnet and the third electromagnet to work, and enters the first-level protection state;

[0029] When the distance difference the controller issues an instruction to control any two of the first electromagnet, the second electromagnet and the third electromagnet to work, and enters the second-level protection state;

[0030] When the distance difference When this happens, the controller issues instructions to control the first electromagnet, the second electromagnet, and the third electromagnet to be powered on and enter the three-level protection state. At the same time, the controller emits an alarm signal, and the staff takes further subsequent protection measures.

[0031] The beneficial effects of the present invention are as follows:

[0032] An air inlet and an air flow channel are provided on the support main body of the present invention. In combination with the hollow connecting rod and the elastic airbag, the support main body can inflate the elastic airbag through the hollow connecting rod, enabling the support main body to adaptively adjust its movement according to the wind force, effectively enhancing the wind resistance of the flexible photovoltaic support; further, the air flow channel and the elastic airbag are designed to be cross-connected structures, effectively ensuring the flexible buffering effect and the position realignment effect of the photovoltaic support.

[0033] The controllable flexible photovoltaic support of the present invention in combination with the multi-level protection control method for over-limit wind force can improve the overall effective control of the working process of the flexible photovoltaic support, ensure the real-time monitoring of the working state of the flexible photovoltaic support, and also effectively improve the wind adaptability of the photovoltaic support.

[0034] The rigid rope traction mechanism of the present invention is provided with a pressure sensor and a multi-level electromagnet structure, making the flexible photovoltaic support stable and reliable during the photovoltaic power generation process; at the same time, compared with the traditional pure mechanical structure, it can better ensure the reliability and stability of the working position of the flexible photovoltaic support main body.

[0035] The back of the support main body of the present invention is provided with non-intersecting cross-shaped air flow channels and is connected to an elastic airbag at the end. This not only makes full use of the environmental wind force but also enables it to have stronger buffering ability and flexibility during the working process compared with the traditional suspension structure.

[0036] Regarding the problem that the working position of the support main body of the flexible photovoltaic support of the present invention is offset due to strong wind, in combination with the multi-level control algorithm for over-limit wind force, it effectively ensures its safety and stability during the working process and significantly improves the flexible adaptation ability of the flexible photovoltaic support when the environment changes. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 is a schematic diagram of the overall structure of the controllable flexible photovoltaic support of the present invention Figure 1 ;

[0038] Figure 2 is a schematic diagram of the overall structure of the controllable flexible photovoltaic support of the present invention Figure 2 ;

[0039] Figure 3 is a schematic diagram of a partial structure of the controllable flexible photovoltaic support of the present invention;

[0040] Figure 4 is a schematic diagram of the structure of the rigid rope traction mechanism;

[0041] Figure 5 It is the rear view of the bracket main body;

[0042] Figure 6 It is the structural schematic diagram of the hollow connecting rod and the elastic airbag;

[0043] Figure 7 It is the schematic diagram of the principle of the controllable flexible photovoltaic bracket of the present invention;

[0044] Figure 8 It is the flowchart of the control method part of the present invention;

[0045] The descriptions of the main component symbols in the figure are as follows:

[0046] 1. Bracket main body; 11. First air inlet; 12. Second air inlet; 13. First air outlet; 14. Second air outlet; 15. First air flow channel; 16. Second air flow channel;

[0047] 2. Rigid rope traction mechanism; 21. Rigid rope; 22. Traction bracket; 23. Electromagnet; 231. First electromagnet; 232. Second electromagnet; 233. Third electromagnet; 24. Connecting rod;

[0048] 3. Base; 4. Photovoltaic panel; 5. Hollow connecting rod; 6. Elastic airbag; 7. Mounting rod. Specific embodiments

[0049] The specific embodiments of the present invention are described below to facilitate those skilled in the art of the present technology to understand the present invention. However, it should be clear that the present invention is not limited to the scope of the specific embodiments. For those of ordinary skill in the art of the present technology, as long as various changes are within the spirit and scope of the present invention defined and determined by the appended claims, these changes are obvious, and all inventions and creations using the concept of the present invention are within the scope of protection.

[0050] As Figure 1 、 2 and shown in Figure 3, the controllable flexible photovoltaic bracket includes a bracket main body 1, a rigid rope traction mechanism 2 and a base 3. The bracket main body 1 is connected to the base 3 through the rigid rope traction mechanism 2, and a photovoltaic panel 4 is arranged on the front side of the bracket main body 1. A plurality of mounting rods 7 are fixed at the bottom of the bracket main body 1 to facilitate the installation and fixation of the flexible photovoltaic bracket. A first air flow channel 15 and a second air flow channel 16 are arranged on the bracket main body 1. The second air outlet 14 of the first air flow channel 15 and the first air outlet 13 of the second air flow channel 16 are both connected to a hollow connecting rod 5. A guiding hole slidably matched with the hollow connecting rod 5 is arranged on the base 3. The guiding hole is connected to an airbag cavity, and an elastic airbag 6 is arranged in the airbag cavity. One end of the elastic airbag 6 is hermetically communicated with the hollow connecting rod 5.

[0051] AsFigure 2 As shown in the figure, the rigid rope traction mechanism 2 includes two rigid ropes 21, a traction bracket 22 and a controller. One end of the rigid rope 21 is fixedly connected to the bracket main body 1, and the other end is connected to the traction bracket 22. A cylindrical installation cavity matching the rigid rope 21 is arranged on the traction bracket 22. A plurality of electromagnets 23 are arranged in the cylindrical installation cavity. The electromagnets 23 are electrically connected to the controller. The electromagnets 23 are used to adsorb and fix the rigid rope 21, and the controller is used to control the electromagnets 23. A pressure sensor is arranged in the middle of each rigid rope 21. The pressure sensor is used to measure the tensile force data of the rigid rope 21 in real time, so as to cooperate with the controller to control a plurality of electromagnets 23, and use the rigid rope 21 to realize multi-level protection of the flexible photovoltaic bracket.

[0052] As Figure 4 shown in the figure, the electromagnet 23 includes a first electromagnet 231, a second electromagnet 232 and a third electromagnet 233. The first electromagnet 231, the second electromagnet 232 and the third electromagnet 233 are arranged at the inlet end of the cylindrical installation cavity in sequence. The electromagnet 23 is preferably an electromagnetic coil. For further improvement, an iron ring matching the electromagnet 23 is arranged at the adsorption end of the rigid rope 21. The iron ring is fixed on the outer side of the rigid rope 21, and the outer side of the iron ring is in clearance or interference fit with the inner diameter of the electromagnet 23.

[0053] As Figure 5 shown in the figure, the middle parts of the first air flow channel 15 and the second air flow channel 16 are cross-connected, so that the air in the first air flow channel 15 and the second air flow channel 16 can be evenly discharged and introduced synchronously, thereby effectively ensuring the flexible buffering effect and the position resetting effect of the photovoltaic bracket. The first air inlet 11 is arranged at the upper left corner of the back surface of the bracket main body 1, the second air inlet 12 is arranged at the upper right corner of the back surface of the bracket main body 1, the first air outlet 13 is arranged at the lower left corner of the back surface of the bracket main body 1, and the second air outlet 14 is arranged at the lower right corner of the back surface of the bracket main body 1.

[0054] As Figure 4 and 6As shown, the elastic airbag 6 is in the shape of a corrugated pipe. One end of the elastic airbag 6 is closed, and a connection hole for cooperating with the hollow connecting rod 5 is provided at the other end. The specific cooperation principle between the hollow connecting rod 5 and the elastic airbag 6: The hollow connecting rod 5 of the bracket main body 1 is connected to the elastic airbag 6. The hollow connecting rod 5 is hollow and the elastic airbag 6 is fixed in the cylindrical cavity of the base 3. When ordinary gentle wind blows towards the back of the bracket main body 1, air enters the two elastic airbags 6 respectively from the first air inlet 11 and the second air inlet 12 through the first air flow channel 15 and the second air flow channel 16. The bracket main body 1 is affected by the wind force, resulting in a change in the conventional working position. The hollow connecting rod 5 moves with the main body 1 and squeezes the elastic airbag 6 in the base 3. The inflated elastic airbag 6 can be used as a buffer to resist the extrusion of the hollow connecting rod 5. After the wind subsides, the air in the elastic airbag 6 is discharged reversely along the air flow channel. At the same time, the bracket main body 1 also returns to the conventional working position under the combined action of the elastic airbag 6 and the rigid rope traction mechanism 2.

[0055] Since the working position of the bracket main body 1 will shift under the influence of wind force, which will further affect the photovoltaic power generation work, and the elastic airbag 6 can only cope with ordinary gentle wind, a control method for a controllable flexible photovoltaic bracket is proposed to provide multi-level protection for the bracket main body 1 under excessive wind force, which specifically includes the following steps:

[0056] S1. After the flexible photovoltaic bracket starts to work, the pressure sensor detects the tensile force data of the rigid rope and sends the real-time tensile force data to the controller;

[0057] S2. Calculate the distance difference through the excessive wind force protection model δ ; The specific excessive wind force protection model is as follows:

[0058]

[0059] In the formula, x is the elastic deformation of the rigid rope, F is the tensile force of the rigid rope measured by the pressure sensor, k is the Hooke's coefficient of the rigid rope; a is the distance from the intersection of the vertical direction of the back side of the base and the traction bracket to the top mounting point of the connecting rod, b is the effective working length of the connecting rod (i.e., the length of the axis of the mounting rod), d is the working length of the bracket main body (i.e., the distance between the rigid rope connection point and the intersection point of the axis of the bracket main body and the hollow connecting rod), L is the distance length between the rigid rope connection point and the intersection point of the straight line where the axis of the hollow connecting rod is located and the axis of the rigid rope; is the distance between the intersection point of the axis of the bracket main body and the hollow connecting rod and the intersection point of the axis of the hollow connecting rod and the axis of the rigid rope in the normal state, sThe distance from the intersection point of the axis of the support body and the hollow connecting rod to the intersection point of the axis of the hollow connecting rod and the axis of the rigid rope during operation; as Figure 7 The schematic diagram of the controllable flexible photovoltaic support shown;

[0060] S3. Set the start difference of the primary protection state as δ 1. The start difference of the secondary protection state is δ 2. The start difference of the tertiary protection state is δ 3. Determine the working difference range corresponding to the electromagnets under several protection states, where ;

[0061] S4. The controller compares the distance difference δ obtained in step S2 with the set working difference range corresponding to the electromagnets to obtain the working conditions and the number of working electromagnets; specifically:

[0062] When the distance difference , the photovoltaic support is in the automatic adjustment and realignment state, and the controller does not issue an instruction, and the flexible photovoltaic support body is automatically adjusted through the rigid rope and the elastic airbag;

[0063] When the distance difference , simply relying on the rope support structure and the elastic airbag cannot resist the influence of the wind. To ensure that the working position of the flexible photovoltaic support body does not deviate more, the controller issues an instruction to control one of the first electromagnet 231, the second electromagnet 232, and the third electromagnet 233 to be energized and work, entering the primary protection state;

[0064] When the distance difference , similarly, to ensure that the main body does not deviate excessively, the controller issues an instruction to control any two of the first electromagnet 231, the second electromagnet 232, and the third electromagnet 233 to be energized and work, entering the secondary protection state;

[0065] When the distance difference , the controller issues an instruction to control the first electromagnet 231, the second electromagnet 232, and the third electromagnet 233 to be all energized and work, entering the tertiary protection state. At this time, it is also the maximum working state of the electromagnets, indicating that the wind force is too strong. At the same time, the controller sends an alarm signal to the photovoltaic power generation base to notify the corresponding staff to take further subsequent protection work.

Claims

1. A control method for a controllable flexible photovoltaic support, the controllable flexible photovoltaic support comprising a support body (1), a rigid rope traction mechanism (2), and a base (3), the support body (1) and the base (3) being connected via the rigid rope traction mechanism (2), and a photovoltaic panel (4) being provided on the front side of the support body (1); The bracket body (1) is provided with a first air flow channel (15) and a second air flow channel (16), the second air outlet (14) of the first air flow channel (15) and the first air outlet (13) of the second air flow channel (16) are both connected to a hollow connecting rod (5), the base (3) is provided with a guide hole that is slidably matched with the hollow connecting rod (5), the guide hole is connected to an airbag cavity, an elastic airbag (6) is provided in the airbag cavity, and one end of the elastic airbag (6) is sealed and connected to the hollow connecting rod (5); The rigid rope traction mechanism (2) comprises two rigid ropes (21), a traction bracket (22) and a controller, one end of the rigid rope (21) is fixedly connected to the bracket body (1), and the other end is connected to the traction bracket (22), the traction bracket (22) is provided with a columnar mounting cavity matched with the rigid rope (21), a plurality of electromagnets (23) are provided in the columnar mounting cavity, the electromagnets (23) are electrically connected to the controller, the electromagnets (23) are used to adsorb and fix the rigid rope (21), and the controller is used to control the electromagnets (23); The electromagnet (23) comprises a first electromagnet (231), a second electromagnet (232) and a third electromagnet (233), wherein the first electromagnet (231), the second electromagnet (232) and the third electromagnet (233) are sequentially arranged at the inlet end of the cylindrical mounting cavity; The first air flow channel (15) and the second air flow channel (16) are cross-connected in the middle; It is characterized by: The steps include: S1. After the flexible photovoltaic bracket starts working, the pressure sensor detects the tension data of the rigid rope and sends the real-time tension data to the controller; S2. Calculate the distance difference using the over-limit wind protection model δ ; The specific over-limit wind protection model is as follows: ； in, x is the elastic deformation of the rigid rope, F The tension on the rigid rope is measured by the pressure sensor. k is the Hooke coefficient of the rigid rope; a The distance from the vertical intersection of the rear side of the base and the traction bracket to the top mounting point of the connecting rod. b is the effective working length of the connecting rod, d is the working length of the bracket body, L is the distance between the rigid rope connection point and the intersection of the line where the hollow connecting rod axis lies and the rigid rope axis; is the distance from the intersection of the support body and the hollow connecting rod axis to the intersection of the hollow connecting rod axis and the rigid rope axis in normal state, s The distance between the intersection of the support body and the axis of the hollow connecting rod and the intersection of the axis of the hollow connecting rod and the axis of the rigid rope during operation; S3, set the starting difference of the first level protection state to be δ 1. The starting difference of the secondary protection state is δ 2. The starting difference of the three-level protection state is δ 3. Determine the working difference range of the electromagnet under several levels of protection, where ; S4, the controller calculates the distance difference obtained in step S2 δ Compare with the working difference range corresponding to the set electromagnet to obtain the working conditions and working quantities of several electromagnets; specifically: When the distance difference When the controller does not issue any instructions, the flexible photovoltaic bracket body is automatically adjusted through the rigid rope and elastic airbag; When the distance difference When the controller issues a command to control one of the first electromagnet (231), the second electromagnet (232) and the third electromagnet (233) to be energized and enter the first level protection state; When the distance difference When the controller issues a command to control any two of the first electromagnet (231), the second electromagnet (232) and the third electromagnet (233) to be powered on and enter the secondary protection state; When the distance difference When the controller issues a command to control the first electromagnet (231), the second electromagnet (232) and the third electromagnet (233) to be energized and work, entering the third level protection state, and at the same time the controller issues an alarm signal, and the staff takes further follow-up protection measures.

2. The control method of the controllable flexible photovoltaic support according to claim 1, characterized in that: The adsorption end of the rigid rope (21) is provided with an iron ring that cooperates with the electromagnet (23).

3. The control method of the controllable flexible photovoltaic support according to claim 1, characterized in that: A pressure sensor is provided in the middle of each rigid rope (21).

4. The control method of the controllable flexible photovoltaic support according to claim 1, characterized in that: The elastic airbag (6) is in the shape of a bellows, one end of the elastic airbag (6) is closed, and the other end is provided with a connection hole that cooperates with the hollow connecting rod (5).

5. The control method of the controllable flexible photovoltaic support according to claim 1, characterized in that: A plurality of mounting rods (7) are provided at the bottom of the bracket body (1).

6. The control method of the controllable flexible photovoltaic support according to claim 1, characterized in that: The first air inlet (11) of the first air flow channel (15) and the second air inlet (12) of the second air flow channel (16) are both arranged on the upper back side of the bracket body (1).

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