Folding type double-shaft tracking photovoltaic power generation application system and double-shaft tracking method

Abstract

The invention relates to the technical field of photovoltaic power generation, in particular to a folding type double-shaft tracking photovoltaic power generation application system and a double-shaft tracking method, and the system comprises a horizontal rotating base, a main body frame, a folding frame, a photoelectric conversion unit, an inclination angle adjusting mechanism and a control system. The left side and the right side of the main body frame are hinged to the folding frames correspondingly, the folding type convenient disassembly and assembly function is achieved, photoelectric conversion units capable of rotating along transverse shafts are arranged in the main body frame and the folding frames correspondingly, and the inclination angle adjusting mechanisms are arranged on the two sides of the photoelectric conversion units and used for driving the photoelectric conversion units to rotate along the transverse shafts. And the photoelectric conversion unit in a folded state is retracted into the main body frame and the folding frame, so that an edge protection effect can be achieved. According to the double-shaft tracking method, the wind resistance of the photoelectric conversion unit can be monitored in real time, when the real-time wind resistance exceeds the wind resistance threshold value, the horizontal rotating base is controlled to complete the preset action, the wind resistance of the photoelectric conversion unit is reduced, and therefore the wind resistance performance in the sun tracking process is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic power generation, and in particular to a foldable dual-axis tracking photovoltaic power generation application system and a dual-axis tracking method. Background Art

[0002] Solar energy is a clean energy. With the development of science and technology, people are paying more and more attention to solar energy. Photovoltaic power generation is a technology that uses the photovoltaic effect of semiconductor interfaces to directly convert solar energy into electrical energy. It is mainly composed of three parts: solar panels (assemblies), controllers and inverters, and the main components are composed of electronic components.

[0003] In order to make the solar panels (assemblies) receive sunlight better, the solar tracking system of the photovoltaic module subsystem has been realized in the art. By real-time tracking of the movement of the sun and adjusting the orientation of the photovoltaic module subsystem rack, the sunlight can be directly irradiated to the light receiving plane of the photovoltaic module subsystem, which can increase the amount of solar radiation received by the photovoltaic module subsystem and improve the overall power generation of the solar photovoltaic power generation system. The solar tracking methods of photovoltaic power generation devices include single-axis automatic tracking and dual-axis automatic tracking. The photovoltaic panels of the dual-axis automatic tracking can be adjusted and rotated in both north-south and east-west directions. The power generation is more than 40% higher than that of fixed photovoltaic power generation devices, and has higher use value and application benefits.

[0004] At present, most photovoltaic brackets are fixed structures. During the installation process, the photovoltaic bracket needs to be moved to the installation location. Ordinary photovoltaic brackets are large in size and weight, not easy to carry, and take a long time to install. In addition, the space occupied by the photovoltaic bracket cannot be reasonably utilized. Especially in areas without city power, disaster relief sites, or field exploration and other construction sites, containers are usually the preferred temporary living place. In order to meet the electricity needs of life and office, it is necessary to design a foldable photovoltaic power generation device that is easy to disassemble and assemble on the top of the container. However, the foldable photovoltaic power generation device has poor wind resistance and is easily affected by factors such as wind resistance and vibration during the sun tracking process, resulting in errors in the tracking angle. Summary of the invention

[0005] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a foldable dual-axis tracking mobile photovoltaic power generation application system and tracking method, which has the function of foldable and convenient disassembly and assembly, and improves the wind resistance during the sun tracking process.

[0006] In order to solve the above technical problems, the present invention provides a foldable dual-axis tracking photovoltaic power generation application system, comprising: Horizontal rotating base; A main frame, the bottom of which is fixedly mounted on the horizontal rotating base; A folding frame, wherein the left and right sides of the main frame are respectively hinged to one of the folding frames; A photoelectric conversion unit, wherein the main frame and the folding frame are respectively provided with the photoelectric conversion unit which can rotate along the horizontal axis; An inclination adjustment mechanism is provided on both sides of the photoelectric conversion unit and is used to drive the photoelectric conversion unit to rotate along a horizontal axis; The control system comprises a sun tracking module, a wind speed sensor, a wind direction sensor and a control module, wherein the control module is electrically connected to the horizontal rotating base, the photoelectric conversion unit, the tilt adjustment mechanism, the sun tracking module, the wind speed sensor and the wind direction sensor respectively.

[0007] Preferably, in the above scheme, two photoelectric conversion units are provided back to back in the main frame, and both sides of the upper edges of the photoelectric conversion units are rotatably connected to the main frame, and two photoelectric conversion units are provided back to back in the folding frame, and both sides of the upper edges of the photoelectric conversion units are rotatably connected to the folding frame.

[0008] Preferably, in the above scheme, the inclination adjustment mechanism includes an electric push rod, the rear end of the electric push rod is rotatably connected to the main frame or the folding frame, and the front end is rotatably connected to the side edge of the photoelectric conversion unit. When the front end of the electric push rod is pushed out, the photoelectric conversion unit is driven to rotate outward along the upper edge, and when the front end of the electric push rod is retracted, the photoelectric conversion unit is driven to rotate inward along the upper edge.

[0009] Preferably, in the above scheme, the horizontal rotating base includes an upper flange plate, a slewing bearing, a lower flange plate and a reduction motor, the upper flange plate is horizontally installed at the top end of the slewing bearing, the lower flange plate is horizontally installed at the bottom end of the slewing bearing, and the reduction motor is used to drive the top end of the slewing bearing to rotate.

[0010] Preferably, in the above scheme, the main frame includes a first vertical rod, a first cross rod and a second cross rod, the bottom ends of the two first vertical rods are fixedly connected to the two ends of the first cross rod, and the top ends are fixedly connected to the two ends of the second cross rod, the upper flange plate is fixedly installed at the middle position of the bottom of the first cross rod, and the two sides of the photoelectric conversion unit of the main frame are rotatably connected to one of the first vertical rods respectively.

[0011] Preferably, in the above scheme, the folding frame includes a first vertical rod, a second vertical rod, a second cross rod and a third cross rod, the bottom ends of the first vertical rod and the second vertical rod are fixedly connected to the two ends of the third cross rod, and the top ends are fixedly connected to the two ends of the second cross rod, one side of the photoelectric conversion unit of the folding frame is rotatably connected to the first vertical rod, and the other side is rotatably connected to the second vertical rod, and the second vertical rod is arranged away from the main frame.

[0012] Preferably, in the above scheme, the control system also includes an inverter, a battery pack and a wireless communication module, the inverter is electrically connected to the control module, the battery pack is electrically connected to the control module and the inverter respectively, and the wireless communication module is electrically connected to the inverter.

[0013] Preferably, in the above scheme, the solar tracking module includes a photosensitive sensor and an inclination sensor, a plurality of the photosensitive sensors are arranged far apart from each other on the front side of the photoelectric conversion unit, and are used to collect light intensity information at different positions of the photoelectric conversion unit, and the inclination sensor is arranged on the back side of the photoelectric conversion unit, and is used to collect position information of the photoelectric conversion unit.

[0014] A dual-axis tracking method is applied to the above-mentioned foldable dual-axis tracking photovoltaic power generation application system, and the dual-axis tracking method comprises: Step S1: Create a virtual mirror image of the photoelectric conversion unit: create a virtual mirror image model of the photoelectric conversion unit in a three-dimensional space coordinate system according to the basic physical parameters of the photoelectric conversion unit and the position information of the photoelectric conversion unit collected in real time by the tilt sensor.

[0015] Step S2: Calculate the real-time wind resistance of the photoelectric conversion unit: input the wind direction information collected by the wind direction sensor in real time into a three-dimensional space coordinate system, calculate the projection area of ​​the virtual mirror model in the wind direction, and calculate the real-time wind resistance of the photoelectric conversion unit in combination with the wind speed information collected by the wind speed sensor.

[0016] Step S3: Selecting the dual-axis tracking mode: When the real-time wind resistance of the photoelectric conversion unit does not exceed the wind resistance threshold, the standard dual-axis tracking mode is selected, and the control module controls the horizontal rotating base and the tilt adjustment mechanism to complete a preset action according to the light intensity information collected by the photosensor, so that the photoelectric conversion unit faces the sun; when the real-time wind resistance of the photoelectric conversion unit exceeds the wind resistance threshold, the modified dual-axis tracking mode is selected, and the control module controls the tilt adjustment mechanism to complete a preset action according to the light intensity information collected by the photosensor, so that the photoelectric conversion unit faces the sun, and controls the horizontal rotating base to complete a preset action according to the wind direction information collected in real time by the wind direction sensor, so that the real-time wind resistance of the photoelectric conversion unit is reduced.

[0017] Preferably, in the above scheme, the real-time wind resistance calculation formula of the photoelectric conversion unit is F=0.5*p*S*Cd*v²; wherein F is the wind resistance experienced by the photoelectric conversion unit; p is the air density under standard conditions; S is the cross-sectional area of ​​the photoelectric conversion unit in the wind direction, which is obtained by calculating the projection area of ​​the virtual mirror model in the wind direction; Cd is the wind resistance coefficient of the photoelectric conversion unit, which is obtained through wind tunnel experiments and gliding experiments; v is the wind speed, which is collected in real time by a wind speed sensor.

[0018] Compared with the existing technology, the present invention has the following beneficial effects: 1. The left and right sides of the main frame of the present invention are respectively hinged to a folding frame, and have a foldable and convenient disassembly function. The main frame and the folding frame are respectively provided with a photoelectric conversion unit that can rotate along the horizontal axis. The inclination adjustment mechanism is arranged on both sides of the photoelectric conversion unit, which is used to drive the photoelectric conversion unit to rotate along the horizontal axis. The photoelectric conversion unit in the folded state is retracted into the main frame and the folding frame, which can play an edge protection role.

[0019] 2. The main frame of the present invention is provided with two back-to-back photoelectric conversion units, and the upper edges of the photoelectric conversion units are rotatably connected to the main frame on both sides. The folding frame is provided with two back-to-back photoelectric conversion units, and the upper edges of the photoelectric conversion units are rotatably connected to the folding frame on both sides. The design is reasonable and the structure is ingenious. The back-to-back photoelectric conversion units occupy a small space when folded, and a large area receiving sunlight when unfolded.

[0020] 3. The dual-axis tracking method of the present invention can monitor the wind resistance of the photoelectric conversion unit in real time. When the real-time wind resistance of the photoelectric conversion unit exceeds the wind resistance threshold, the corrected dual-axis tracking mode is selected, and the control module controls the tilt adjustment mechanism to complete the preset action according to the light intensity information collected by the photosensitive sensor, so that the photoelectric conversion unit faces the sun, and controls the horizontal rotating base to complete the preset action according to the wind direction information collected in real time by the wind direction sensor, thereby reducing the wind resistance of the photoelectric conversion unit, thereby improving the wind resistance during the sun tracking process. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a front view of the unfolded structure of a foldable dual-axis tracking photovoltaic power generation application system of the present invention.

[0022] Figure 2 The present invention is a top view of the unfolded structure of a foldable dual-axis tracking photovoltaic power generation application system.

[0023] Figure 3 This is a left view of the unfolded structure of a foldable dual-axis tracking photovoltaic power generation application system of the present invention.

[0024] Figure 4 The present invention is a top view of the folding structure of a foldable dual-axis tracking photovoltaic power generation application system.

[0025] Figure 5 This is a left view of the folding structure of a foldable dual-axis tracking photovoltaic power generation application system of the present invention.

[0026] Figure 6 The present invention is a circuit connection schematic diagram of a foldable dual-axis tracking photovoltaic power generation application system.

[0027] Figure 7 The present invention is a flow chart of a dual-axis tracking method of a foldable dual-axis tracking photovoltaic power generation application system.

[0028] Among them, 1-horizontal rotating base, 11-upper flange plate, 12-slewing bearing, 13-lower flange plate, 14-reduction motor, 2-main frame, 21-first vertical rod, 211-bolt hole, 22-first cross bar, 221-first pin shaft, 222-second pin shaft, 23-second cross bar, 3-folding frame, 31-second vertical rod, 32-third cross bar, 4-photoelectric conversion unit, 41-solar cell panel, 42-frame structure, 421-third pin shaft, 5-tilt adjustment mechanism, 51-electric push rod, 511-inner tube, 512-outer tube, 513-motor, 6-folding hinge, 7-buckle, 71-female buckle, 72-male buckle, 8-lifting ear. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0031] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If the terms "first", "second", "third" are described, they are only used for the purpose of description and distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0032] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The following is an explanation of the embodiments of the present invention based on its overall structure.

[0033] like Figure 1-2 As shown, the embodiment discloses a foldable dual-axis tracking photovoltaic power generation application system, comprising: a horizontal rotating base 1, a main frame 2, a folding frame 3, a photoelectric conversion unit 4, a tilt adjustment mechanism 5 and a control system, wherein the bottom of the main frame 2 is fixedly mounted on the horizontal rotating base 1, and the left and right sides of the main frame 2 are respectively hinged with a folding frame 3, and have a foldable and convenient disassembly function, and the main frame 2 and the folding frame 3 are respectively provided with a photoelectric conversion unit 4 that can rotate along the horizontal axis, and the tilt adjustment mechanism 5 is arranged on both sides of the photoelectric conversion unit 4, and is used to drive the photoelectric conversion unit 4 to rotate along the horizontal axis. The photoelectric conversion unit 4 in the folded state is retracted into the main frame 2 and the folding frame 3, which can play an edge protection role; the control system comprises a solar tracking module, a wind speed sensor, a wind direction sensor and a control module, and the control module is electrically connected to the horizontal rotating base, the photoelectric conversion unit, the tilt adjustment mechanism, the solar tracking module, the wind speed sensor, and the wind direction sensor respectively.

[0034] like Figure 3-5In the above, two back-to-back photoelectric conversion units 4 are arranged in the main frame 2, and the upper edges of the photoelectric conversion units 4 are rotatably connected to the main frame 2. Two back-to-back photoelectric conversion units 4 are arranged in the folding frame 3, and the upper edges of the photoelectric conversion units 4 are rotatably connected to the folding frame 3. Specifically, the photoelectric conversion unit 4 includes a solar cell panel 41 and a frame structure 42, the solar cell panel 41 is fixedly installed on the inner side of the frame structure 42, and the left and right sides of the frame structure 42 are respectively provided with a third pin shaft 421 near the middle position, and the upper ends of the left and right sides of the frame structure 42 are respectively rotatably connected to the main frame 2 or the folding frame 3 through the second pin shaft 222.

[0035] The tilt adjustment mechanism 5 in this embodiment includes an electric push rod 51, the rear end of the electric push rod 51 is rotationally connected to the main frame 2 or the folding frame 3, and the front end is rotationally connected to the side edge of the photoelectric conversion unit 4. When the front end of the electric push rod 51 is pushed out, the photoelectric conversion unit 4 is driven to rotate outward along the upper edge. When the front end of the electric push rod 51 is retracted, the photoelectric conversion unit 4 is driven to rotate inward along the upper edge.

[0036] Continue to refer Figure 3 The electric push rod 51 includes an inner tube 511, an outer tube 512 and a motor 513. The motor 513 is used to drive the inner tube 511 to telescope at the front end of the outer tube 512. The front end of the inner tube 511 is rotatably connected to the third pin 421, and the rear end of the outer tube 512 is rotatably connected to the main frame 2 or the folding frame 3 through the first pin 221. It is worth noting that when the electric push rod 51 is in the initial state, the two photoelectric conversion units 4 arranged back to back are parallel to each other. When the control module issues an instruction to control the motor 513 to drive the inner tube 511 to extend, the two photoelectric conversion units 4 arranged back to back are respectively rotated outward with the second pin 222 on their upper edges as the rotation axis until the two photoelectric conversion units 4 are parallel to each other again.

[0037] The horizontal rotating base 1 in this embodiment includes an upper flange plate 11, a slewing bearing 12, a lower flange plate 13 and a reduction motor 14. The upper flange plate 11 is horizontally installed at the top end of the slewing bearing 12, the lower flange plate 13 is horizontally installed at the bottom end of the slewing bearing 12, and the reduction motor 14 is used to drive the top end of the slewing bearing 12 to rotate.

[0038] The present embodiment discloses an assembly structure of a main frame 2 and a folding frame 3, wherein the main frame 2 comprises a first vertical rod 21, a first cross rod 22 and a second cross rod 23, wherein the bottom ends of the two first vertical rods 21 are fixedly connected to the two ends of the first cross rod 22, and the top ends are fixedly connected to the two ends of the second cross rod 23, and the upper flange plate 11 is fixedly installed at the middle position of the bottom of the first cross rod 22, and the two sides of the photoelectric conversion unit 4 of the main frame 2 are rotatably connected to a first vertical rod 21 respectively; the folding frame 3 comprises a first vertical rod 21, a second vertical rod 31, a second cross rod 23 and a third cross rod 32, wherein the bottom ends of the first vertical rod 21 and the second vertical rod 31 are fixedly connected to the two ends of the third cross rod 32, and the top ends are fixedly connected to the two ends of the second cross rod 23, one side of the photoelectric conversion unit 4 of the folding frame 3 is rotatably connected to the first vertical rod 21, and the other side is rotatably connected to the second vertical rod 31, and the second vertical rod 31 is arranged away from the main frame 2.

[0039] Continue to refer Figure 4 , 5 The main frame 2 is provided with a plurality of folding hinges 6 on the left front side and the right rear side, respectively. The folding hinges 6 are installed on the first vertical rod 21 of the main frame 2 and the folding frame 3 by screws, so that the folding frame 3 on the left side of the main frame 2 can be folded to the front of the main frame 2, and the folding frame 3 on the right side of the main frame 2 can be folded to the back of the main frame 2; the second cross bar 23 is provided with a buckle 7, and the buckle 7 includes a female buckle 71 and a male buckle 72 that are adapted to each other. The female buckle 71 is provided at the upper right corner of the front side and the upper left corner of the back side of the second cross bar 23 respectively provided on the main frame 2, and the male buckle 72 is provided on the second cross bar 23 respectively provided on the folding frame 3, so that the main frame 2 and the folding frame 3 in the folded state can be buckled and connected by the buckle 7; the upper and lower parts of the first vertical rod 21 are respectively provided with bolt holes 211, so that the main frame 2 and the folding frame 3 in the unfolded state can be fastened and connected by bolts. In addition, two ears 8 are provided at both ends of the top of the second cross bar 23 of the main frame 2 to facilitate the hoisting of the main frame 2.

[0040] like Figure 6 As shown, the control system in this embodiment also includes an inverter, a battery pack and a wireless communication module. The inverter is electrically connected to the control module, the battery pack is electrically connected to the control module and the inverter respectively, and the wireless communication module is electrically connected to the inverter. In normal operation, the photoelectric conversion unit 4 converts the collected solar energy into electrical energy, and then charges the battery pack after the voltage is stabilized by the voltage stabilizing device. The battery pack can overcome the problem of unstable power in the application of photovoltaic power generation system, and ensure that it has a certain power supply endurance in rainy days or when the light is insufficient. The inverter is used to convert direct current into alternating current to meet the power demand of AC loads such as wireless communication modules.

[0041] Furthermore, the sun tracking module includes a photosensitive sensor and a tilt sensor, wherein a plurality of photosensitive sensors are arranged at a distance from each other on the front of the photoelectric conversion unit 4 to collect light intensity information at different positions of the photoelectric conversion unit 4, and the tilt sensor is arranged on the back of the photoelectric conversion unit 4 to collect position information of the photoelectric conversion unit 4. It can be understood that the photosensitive sensors can be arranged at the four corners of the solar cell panel 41, and the tilt sensor can be arranged at the center of the back of the solar cell panel 41.

[0042] In addition, in this embodiment, the photoelectric conversion units 4 on the same surface of the main frame 2 and the folding frame 3 are connected in series with each other, and then the photoelectric conversion units 4 on the front and back of the main frame 2 are connected in parallel and electrically connected to the control module; the electric push rods 51 on both sides of the photoelectric conversion units 4 on the same surface of the main frame 2 and the folding frame 3 are connected in series with each other, and then electrically connected to the control module respectively.

[0043] A dual-axis tracking method is applied to the above-mentioned foldable dual-axis tracking photovoltaic power generation application system, and the dual-axis tracking method includes: Step S1: Create a virtual mirror image of the photoelectric conversion unit 4: Create a virtual mirror image model of the photoelectric conversion unit 4 in a one-to-one ratio in a three-dimensional space coordinate system based on the basic physical parameters of the photoelectric conversion unit 4 and the position information of the photoelectric conversion unit 4 collected in real time by the tilt sensor.

[0044] Specifically, the basic physical parameters of the photoelectric conversion unit 4 include the length, width, and height parameters of the photoelectric conversion unit 4. The position information of the inclination sensor at the center position of the back of a photoelectric conversion unit 4 in the main frame can be used as the origin of the three-dimensional space coordinate system. According to the position information collected by other inclination sensors, a virtual mirror model of the photoelectric conversion unit 4 is created in the three-dimensional space coordinate system.

[0045] Step S2: Calculate the real-time wind resistance of the photoelectric conversion unit 4: input the wind direction information collected by the wind direction sensor in real time into the three-dimensional space coordinate system, calculate the projection area of ​​the virtual mirror model in the wind direction, and calculate the real-time wind resistance of the photoelectric conversion unit in combination with the wind speed information collected by the wind speed sensor.

[0046] Preferably, the wind direction sensor and the wind speed sensor are fixedly installed on the top of the second crossbar 23 of the main frame 2, the wind direction information collected by the wind direction sensor in real time is input into the three-dimensional space coordinate system, the projection area of ​​the virtual mirror model in the wind direction is calculated as the cross-sectional area of ​​the photoelectric conversion unit 4 in the wind direction, and the real-time wind resistance of the photoelectric conversion unit 4 is calculated according to the object wind resistance calculation formula, and the wind resistance calculation formula is F=0.5*p*S*Cd*v²; Wherein, F is the wind resistance experienced by the photoelectric conversion unit 4; p is the air density under standard conditions; S is the cross-sectional area of ​​the photoelectric conversion unit 4 in the wind direction, which is obtained by calculating the projection area of ​​the virtual mirror model in the wind direction; Cd is the wind resistance coefficient of the photoelectric conversion unit 4, which is obtained through wind tunnel experiments and gliding experiments; v is the wind speed, which is collected in real time by a wind speed sensor.

[0047] Step S3: Select the dual-axis tracking mode: when the real-time wind resistance of the photoelectric conversion unit 4 does not exceed the wind resistance threshold, select the standard dual-axis tracking mode, and the control module controls the horizontal rotating base 1 and the tilt adjustment mechanism 5 to complete the preset action according to the light intensity information collected by the photosensor, so that the photoelectric conversion unit 4 faces the sun; when the real-time wind resistance of the photoelectric conversion unit 4 exceeds the wind resistance threshold, select the modified dual-axis tracking mode, and the control module controls the tilt adjustment mechanism 5 to complete the preset action according to the light intensity information collected by the photosensor, so that the photoelectric conversion unit 4 faces the sun, and controls the horizontal rotating base 1 to complete the preset action according to the wind direction information collected in real time by the wind direction sensor, so that the real-time wind resistance of the photoelectric conversion unit 4 is reduced.

[0048] Specifically, by conducting a wind resistance test on the foldable dual-axis tracking photovoltaic power generation application system in this embodiment, the maximum wind resistance value of the device in a safe operation state can be obtained, and then an appropriate wind resistance threshold is set based on the actual installation scenario to ensure that the device can operate safely.

[0049] The standard dual-axis tracking mode in this embodiment includes a closed-loop tracking method and an open-loop tracking method. The closed-loop tracking method uses a photosensitive sensor to track the position of the sun at regular intervals, and controls the photoelectric conversion unit 4 to quickly move in the direction of a larger reading, that is, a larger light intensity. The open-loop tracking system calculates the coordinates of the sun in the sky based on the local longitude and latitude coordinates and time using astronomical calculation formulas, and then controls the photoelectric conversion unit 4 to track. The current existing technology has combined the two tracking methods. In good weather conditions, the open-loop tracking method is used to track the approximate position of the sun, and then the closed-loop tracking method is used for precise adjustment. In bad weather conditions, the open-loop tracking method is used alone for tracking to avoid interference from stray light in the sky.

[0050] The modified dual-axis tracking mode in this embodiment is based on the standard dual-axis tracking mode. It follows a closed-loop tracking method, that is, it uses a photosensitive sensor to track the position of the sun at regular intervals. The tilt adjustment mechanism 5 is first controlled to drive the photoelectric conversion unit 4 to move rapidly in the direction of a larger reading, that is, a direction of greater light intensity, so that the photoelectric conversion unit 4 faces the sun and the incident angle of sunlight is close to 90°. The horizontal rotating base 1 is then controlled to drive the left and right sides of the main frame 2 and the folding frame 3 to rotate rapidly in the wind direction, so as to reduce the cross-sectional area of ​​the photoelectric conversion unit 4 in the wind direction, thereby reducing the wind resistance of the photoelectric conversion unit 4. This dual-axis tracking method can improve the wind resistance of the foldable dual-axis tracking photovoltaic power generation application system in this embodiment during the solar tracking process.

[0051] The foregoing description of specific exemplary embodiments of the present invention is for the purpose of illustration and demonstration. These descriptions are not intended to limit the present invention to the precise form disclosed, and it is clear that many changes and variations can be made based on the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art can realize and utilize various different exemplary embodiments of the present invention and various different selections and changes. The scope of the present invention is intended to be limited by the claims and their equivalents.

Claims

1. A foldable dual-axis tracking photovoltaic power generation application system, characterized in that: include: Horizontal rotating base; A main frame, the bottom of which is fixedly mounted on the horizontal rotating base; A folding frame, wherein the left and right sides of the main frame are respectively hinged to one of the folding frames; A photoelectric conversion unit, wherein the main frame and the folding frame are respectively provided with the photoelectric conversion unit which can rotate along the horizontal axis; An inclination adjustment mechanism is provided on both sides of the photoelectric conversion unit and is used to drive the photoelectric conversion unit to rotate along a horizontal axis; The control system comprises a sun tracking module, a wind speed sensor, a wind direction sensor and a control module, wherein the control module is electrically connected to the horizontal rotating base, the photoelectric conversion unit, the tilt adjustment mechanism, the sun tracking module, the wind speed sensor and the wind direction sensor respectively.

2. A foldable dual-axis tracking photovoltaic power generation application system according to claim 1, characterized in that: Two photoelectric conversion units are arranged back to back in the main frame, and both sides of the upper edges of the photoelectric conversion units are rotatably connected to the main frame. Two photoelectric conversion units are arranged back to back in the folding frame, and both sides of the upper edges of the photoelectric conversion units are rotatably connected to the folding frame.

3. A foldable dual-axis tracking photovoltaic power generation application system according to claim 2, characterized in that: The inclination adjustment mechanism includes an electric push rod, a rear end of which is rotatably connected to the main frame or the folding frame, and a front end of which is rotatably connected to the side edge of the photoelectric conversion unit. When the front end of the electric push rod is pushed out, the photoelectric conversion unit is driven to rotate outward along the upper edge, and when the front end of the electric push rod is retracted, the photoelectric conversion unit is driven to rotate inward along the upper edge.

4. A foldable dual-axis tracking photovoltaic power generation application system according to claim 1, characterized in that: The horizontal rotating base includes an upper flange plate, a slewing bearing, a lower flange plate and a reduction motor. The upper flange plate is horizontally installed on the top end of the slewing bearing, the lower flange plate is horizontally installed on the bottom end of the slewing bearing, and the reduction motor is used to drive the top end of the slewing bearing to rotate.

5. A foldable dual-axis tracking photovoltaic power generation application system according to claim 4, characterized in that: The main frame includes a first vertical rod, a first cross rod and a second cross rod. The bottom ends of the two first vertical rods are fixedly connected to the two ends of the first cross rod, and the top ends are fixedly connected to the two ends of the second cross rod. The upper flange plate is fixedly installed at the middle position of the bottom of the first cross rod. The two sides of the photoelectric conversion unit of the main frame are respectively rotatably connected to one of the first vertical rods.

6. A foldable dual-axis tracking photovoltaic power generation application system according to claim 5, characterized in that: The folding frame includes a first vertical rod, a second vertical rod, a second cross rod and a third cross rod. The bottom ends of the first vertical rod and the second vertical rod are fixedly connected to the two ends of the third cross rod, and the top ends are fixedly connected to the two ends of the second cross rod. One side of the photoelectric conversion unit of the folding frame is rotatably connected to the first vertical rod, and the other side is rotatably connected to the second vertical rod. The second vertical rod is arranged away from the main frame.

7. The foldable dual-axis tracking photovoltaic power generation application system according to claim 1, characterized in that: The control system further includes an inverter, a battery pack and a wireless communication module. The inverter is electrically connected to the control module, the battery pack is electrically connected to the control module and the inverter respectively, and the wireless communication module is electrically connected to the inverter.

8. The foldable dual-axis tracking photovoltaic power generation application system according to claim 1, characterized in that: The solar tracking module includes a photosensitive sensor and an inclination sensor. A plurality of the photosensitive sensors are arranged on the front side of the photoelectric conversion unit away from each other to collect light intensity information at different positions of the photoelectric conversion unit. The inclination sensor is arranged on the back side of the photoelectric conversion unit to collect position information of the photoelectric conversion unit.

9. A dual-axis tracking method, characterized in that: Applied to the foldable dual-axis tracking photovoltaic power generation application system according to any one of claims 1 to 8, the dual-axis tracking method comprises: Step S1: creating a virtual mirror image of the photoelectric conversion unit: creating a virtual mirror image model of the photoelectric conversion unit in a three-dimensional space coordinate system according to the basic physical parameters of the photoelectric conversion unit and the position information of the photoelectric conversion unit collected in real time by the tilt sensor; Step S2: Calculating the real-time wind resistance of the photoelectric conversion unit: inputting the wind direction information collected by the wind direction sensor in real time into a three-dimensional space coordinate system, calculating the projection area of ​​the virtual mirror model in the wind direction, and calculating the real-time wind resistance of the photoelectric conversion unit in combination with the wind speed information collected by the wind speed sensor; Step S3: Selecting the dual-axis tracking mode: When the real-time wind resistance of the photoelectric conversion unit does not exceed the wind resistance threshold, the standard dual-axis tracking mode is selected, and the control module controls the horizontal rotating base and the tilt adjustment mechanism to complete a preset action according to the light intensity information collected by the photosensor, so that the photoelectric conversion unit faces the sun; when the real-time wind resistance of the photoelectric conversion unit exceeds the wind resistance threshold, the modified dual-axis tracking mode is selected, and the control module controls the tilt adjustment mechanism to complete a preset action according to the light intensity information collected by the photosensor, so that the photoelectric conversion unit faces the sun, and controls the horizontal rotating base to complete a preset action according to the wind direction information collected in real time by the wind direction sensor, so that the real-time wind resistance of the photoelectric conversion unit is reduced.

10. A dual-axis tracking method according to claim 9, characterized in that: The real-time wind resistance calculation formula of the photoelectric conversion unit is F=0.5*p*S*Cd*v²; wherein F is the wind resistance of the photoelectric conversion unit; p is the air density under standard conditions; S is the cross-sectional area of ​​the photoelectric conversion unit in the wind direction, which is obtained by calculating the projection area of ​​the virtual mirror model in the wind direction; Cd is the wind resistance coefficient of the photoelectric conversion unit, which is obtained through wind tunnel experiments and gliding experiments; v is the wind speed, which is collected in real time by a wind speed sensor.

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