Floating type photovoltaic power generation device with water spraying dynamic positioning system

Abstract

According to the floating type photovoltaic power generation device provided with the water spraying dynamic positioning system, in the device, a photovoltaic support comprises a bottom face composed of horizontal supporting rods and inclined supporting rods obliquely connected with the horizontal supporting rods, a buoy is connected with the bottom face to provide buoyancy, and a photovoltaic power generation panel is supported on the inclined supporting rods; the gravity center sensing device is installed on the water pumping device, the gyroscope measures gravity center change signals caused by wave loads or wind loads, the wire is connected with the gyroscope and the water pump so as to convey the gravity center change signals to the water pump, the at least one guide pipe communicates with the water pump, the at least one water spraying device communicates with the guide pipe, and the water pump adjusts pressure in the guide pipe based on the gravity center change signals. And the water spraying device sprays water in the direction opposite to the gravity center change so as to dynamically position and adjust in real time. The device reduces the wave load acting on the floating type photovoltaic power generation system, reduces the change memory of the mooring internal force, and keeps the dynamic positioning of the floating type photovoltaic power generation system.

Description

Technical Field

[0001] The invention relates to the technical field of marine photovoltaic power generation, and in particular to a floating photovoltaic power generation device provided with a water spraying dynamic positioning system. Background Art

[0002] With the continuous consumption of traditional resources, the use of renewable energy such as solar energy is becoming increasingly important. However, traditional land-based photovoltaics are limited by the current shortage of land resources. The floating photovoltaic power generation system not only solves the above problems, but also makes full use of the solar energy resources in coastal areas, reduces the cost of electricity transportation, and improves the efficiency of solar power generation.

[0003] Due to the complex and severe marine environment, during the service life of the floating photovoltaic power generation system, wave loads and wind loads can easily cause it to have large displacements and rotation angles, which in turn lead to large changes in the mooring internal forces. Therefore, the water jet dynamic positioning system can not only control the floating photovoltaic power generation system to work at a predetermined position and reduce the changes in the mooring internal forces, but also reduce the wave loads acting on the floating photovoltaic power generation system.

[0004] The above information disclosed in this Background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art that is already known to a person of ordinary skill in the art. Summary of the invention

[0005] The purpose of the present invention is to provide a floating photovoltaic power generation device equipped with a water spraying dynamic positioning system, which can reduce the wave load acting on the floating photovoltaic power generation system, reduce the change memory of the mooring internal force and maintain the dynamic positioning of the floating photovoltaic power generation system.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A floating photovoltaic power generation device provided with a water-spraying dynamic positioning system of the present invention comprises:

[0008] At least one floating photovoltaic power generation system comprising:

[0009] A photovoltaic support comprises a bottom surface formed by horizontal support rods and oblique support rods obliquely connected to the horizontal support rods.

[0010] a buoy connected to the bottom surface to provide buoyancy,

[0011] A photovoltaic power generation panel, which is supported by the oblique support rod;

[0012] A water-spraying dynamic positioning system is installed between horizontal support rods, and the water-spraying dynamic positioning system includes:

[0013] A water pumping device comprising a water pump,

[0014] A gravity center sensing device is installed on the pumping device, and the gravity center sensing device includes:

[0015] A gyroscope that measures a center of gravity change signal caused by wave load or wind load, the gyroscope comprising:

[0016] Axis of rotation,

[0017] a rotor, which rotates about the rotation axis,

[0018] The inner ring swings left and right around the rotation axis.

[0019] The middle ring swings up and down around the rotation axis,

[0020] The outer ring swings back and forth about the rotation axis,

[0021] a wire connecting the gyroscope and the water pump to transmit the center of gravity change signal to the water pump,

[0022] at least one conduit connected to the water pump,

[0023] At least one water spray device is connected to the conduit, and a water pump adjusts the pressure in the conduit based on the center of gravity change signal, so that the water spray device sprays water in the opposite direction of the center of gravity change to adjust the positioning dynamically in real time.

[0024] The floating photovoltaic power generation device provided with a water-spraying dynamic positioning system also includes a mooring system connected to the photovoltaic support, wherein the mooring cable is connected to the photovoltaic support fixed on the seabed.

[0025] In the floating photovoltaic power generation device provided with a water spraying dynamic positioning system, the floating photovoltaic power generation systems are connected by rubber belts.

[0026] In the floating photovoltaic power generation device provided with a water spraying dynamic positioning system, the photovoltaic power generation panel array is arranged with 64 photovoltaic panels.

[0027] In the floating photovoltaic power generation device provided with a water spraying dynamic positioning system, the buoy has a diameter of 1200 mm and a length of 6630 mm.

[0028] In the floating photovoltaic power generation device provided with a water-spraying dynamic positioning system, the photovoltaic power generation panel is fixed to the oblique support rod by means of I-beams and channel steels.

[0029] In the floating photovoltaic power generation device provided with a water spraying dynamic positioning system, the water spraying device includes a No. 1 water spraying device in the front row that sprays water horizontally forward, a No. 2 water spraying device in the rear row that sprays water horizontally backward, a No. 3 water spraying device in the front row that sprays water horizontally to the left, and a No. 4 water spraying device in the rear row that sprays water horizontally to the right.

[0030] In the floating photovoltaic power generation device provided with a water spraying dynamic positioning system, the water pump adjusts the pressure in the conduit based on the center of gravity change signal, so that the water spraying device sprays water in the opposite direction of the center of gravity change.

[0031] In the floating photovoltaic power generation device provided with a water spraying dynamic positioning system, each water spraying device is individually connected to a water pump.

[0032] In the floating photovoltaic power generation device provided with a water spraying dynamic positioning system, the floating photovoltaic power generation device is a symmetrical structure.

[0033] In the above technical scheme, a floating photovoltaic power generation device provided with a water spraying dynamic positioning system provided by the present invention has the following beneficial effects: the water pump of the floating photovoltaic power generation device provided with the water spraying dynamic positioning system reduces the pressure in the conduit by exhausting air, draws water from the ocean and transports it to the water spraying device, and the water spraying device sprays water from the opposite direction of the change of the center of gravity, thereby reducing the displacement of the center of gravity and controlling the floating photovoltaic power generation device to work at a predetermined position; the water spraying dynamic positioning can weaken the wave action through the front and rear rows of water spraying devices, thereby reducing the wave load acting on the floating photovoltaic power generation device; the water spraying dynamic positioning system reduces the mooring tension caused by the displacement or rotation of the floating photovoltaic power generation device by reducing the displacement of the center of gravity of the floating photovoltaic power generation device, thereby alleviating the fatigue damage of the mooring. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0035] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0036] Figure 2 It is a schematic diagram of a water-spraying dynamic positioning system;

[0037] Figure 3 It is a schematic diagram of the center of gravity sensing device;

[0038] Figure 4 It is a schematic diagram of the pumping device;

[0039] Figure 5 It is a schematic diagram of the front row No. 1 water spray device and the rear row No. 2 water spray device;

[0040] Figure 6 It is a schematic diagram of sprinkler No. 3;

[0041] Figure 7 It is a schematic diagram of the No. 4 sprinkler;

[0042] In the figure, 1-1 is a photovoltaic panel, 1-2 is a horizontal support rod, 1-3 is an oblique support rod, 2-1 is a center of gravity sensing device, 2-2 is a water pumping device, 2-3 is a guide tube, 2-4 is a front row water spraying device No. 1, 2-5 is a rear row water spraying device No. 2, 2-6 is a water spraying device No. 3, 2-7 is a water spraying device No. 4, 3-1 is a gyroscope, 3-2 is an outer ring, 3-3 is a middle ring, 3-4 is an inner ring, 3-5 is a rotor, 3-6 is a rotating shaft, 3-7 is a conducting wire, 3-8 is a rotating connecting rod, 4-1 is a water pump No. 1, 4-2 is a water pump No. 2, 4-3 is a water pump No. 3, 4-4 is a water pump No. 4. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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.

[0044] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. 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.

[0045] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0046] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships 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 referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0047] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0048] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0050] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0051] See also Figure 1-7 As shown, in one embodiment, a floating photovoltaic power generation device provided with a water-spraying dynamic positioning system of the present invention comprises:

[0052] At least one floating photovoltaic power generation system comprising:

[0053] The photovoltaic support comprises a bottom surface formed by horizontal support rods 1-2 and oblique support rods 1-3 obliquely connected to the horizontal support rods 1-2.

[0054] a buoy connected to the bottom surface to provide buoyancy,

[0055] Photovoltaic power generation panel 1-1, which is supported by the oblique support rod 1-3;

[0056] A water-spraying dynamic positioning system is installed between the horizontal support rods 1-2. The water-spraying dynamic positioning system includes:

[0057] The pumping device 2-2 comprises a water pump,

[0058] The gravity center sensing device 2-1 is installed on the pumping device 2-2. The gravity center sensing device 2-1 includes:

[0059] A gyroscope 3-1, which measures a center of gravity change signal caused by wave load or wind load, and the gyroscope 3-1 includes:

[0060] Rotation axis 3-6,

[0061] a rotor 3-5, which rotates around the rotation axis 3-6,

[0062] The inner ring 3-4 swings left and right around the rotation axis 3-6.

[0063] The middle ring 3-3 swings up and down around the rotation axis 3-6.

[0064] The outer ring 3-2 swings back and forth around the rotation axis 3-6,

[0065] A wire 3-7, which connects the gyroscope 3-1 and the water pump to transmit the center of gravity change signal to the water pump,

[0066] at least one conduit 2-3 connected to the water pump,

[0067] At least one water spray device is connected to the conduit 2-3, and a water pump adjusts the pressure in the conduit 2-3 based on the center of gravity change signal, so that the water spray device sprays water in the opposite direction of the center of gravity change to adjust the positioning dynamically in real time.

[0068] In a preferred embodiment of the floating photovoltaic power generation device provided with a water-spraying dynamic positioning system, it also includes a mooring system connected to the photovoltaic support, wherein the mooring cable is connected to the photovoltaic support fixed on the seabed.

[0069] In a preferred embodiment of the floating photovoltaic power generation device provided with a water spraying dynamic positioning system, the floating photovoltaic power generation systems are connected by rubber belts.

[0070] In a preferred embodiment of the floating photovoltaic power generation device provided with a water spraying dynamic positioning system, the photovoltaic power generation panel 1-1 array is arranged with 64 photovoltaic panels.

[0071] In a preferred embodiment of the floating photovoltaic power generation device provided with a water spraying dynamic positioning system, the buoy has a diameter of 1200 mm and a length of 6630 mm.

[0072] In a preferred embodiment of the floating photovoltaic power generation device provided with a water-spraying dynamic positioning system, the photovoltaic power generation panel 1-1 is fixed to the oblique support rod 1-3 by means of an I-beam and a channel steel.

[0073] In a preferred embodiment of the floating photovoltaic power generation device provided with a water spraying dynamic positioning system, the water spraying device includes a No. 1 water spraying device in the front row that sprays water horizontally forward, a No. 2 water spraying device in the rear row that sprays water horizontally backward, a No. 3 water spraying device in the front row that sprays water horizontally to the left, and a No. 4 water spraying device in the rear row that sprays water horizontally to the right.

[0074] In a preferred embodiment of the floating photovoltaic power generation device provided with a water spraying dynamic positioning system, the water pump adjusts the pressure in the conduit 2-3 based on the center of gravity change signal, so that the water spraying device sprays water in the opposite direction of the center of gravity change.

[0075] In a preferred embodiment of the floating photovoltaic power generation device provided with a water spraying dynamic positioning system, each water spraying device is individually connected to a water pump.

[0076] In a preferred embodiment of the floating photovoltaic power generation device provided with a water spraying dynamic positioning system, the floating photovoltaic power generation device is a symmetrical structure.

[0077] In one embodiment, a floating photovoltaic power generation device provided with a water-spraying dynamic positioning system comprises a floating photovoltaic power generation system, a water-spraying dynamic positioning system, and a mooring system. The floating photovoltaic power generation system is composed of a photovoltaic panel and a floating photovoltaic bracket. A dynamic water-spraying positioning system is provided between the photovoltaic brackets, and the entire device is constrained by the mooring system. The water-spraying dynamic positioning system comprises a pumping device 2-2, a guide tube 2-3, a water-spraying device, and a center of gravity sensing device 2-1. The center of gravity sensing device 2-1 can sense the change of the center of gravity of the floating photovoltaic power generation device, and adjust the water-spraying direction of the water-spraying device in real time, so as to achieve the effect that the floating photovoltaic power generation device can be dynamically positioned in real time. When the floating photovoltaic power generation device is displaced or rotated due to wave loads and wind loads, the center of gravity sensing device 2-1 can sense the change of the center of gravity, mobilize the pumping device 2-2 to pump water from below the sea surface to the water-spraying device, and the water-spraying device controls the direction of water spraying by sensing the change of the center of gravity, reduces the displacement of the center of gravity, and controls the floating photovoltaic power generation device to work at a predetermined position. When the floating photovoltaic power generation device is displaced or rotated due to wave load, the wave action can be weakened by the front and rear water spray devices, thereby reducing the wave load acting on the floating photovoltaic power generation device. The characteristics of reducing the fatigue damage of the mooring are mainly that the water spray dynamic positioning system reduces the displacement of the center of gravity of the floating photovoltaic power generation device, thereby reducing the mooring tension caused by the displacement or rotation of the floating photovoltaic power generation device, thereby reducing the fatigue damage of the mooring.

[0078] In one embodiment, Figure 1 As shown, a floating photovoltaic power generation device equipped with a water spray dynamic positioning system has buoys at the front and rear ends, and the buoys have a diameter of 1200 mm and a length of 6630 mm.

[0079] like Figure 2 , Figure 3 , Figure 4 As shown, the water spray dynamic positioning system is installed between horizontal support rods. The water spray dynamic positioning system includes a pumping device 2-2, a conduit 2-3, water spray devices 2-4 to 2-7 and a center of gravity sensing device 2-1. The center of gravity sensing device 2-1 is installed on the upper part of the pumping device 2-2 and is connected by a wire. When the floating photovoltaic power generation system is displaced or rotated due to wave load and wind load, the gyroscope 3-1 in the center of gravity sensing device 2-1 senses the change of the center of gravity caused by the displacement or rotation, and sends the signal of the center of gravity change to the water pumps 4-1 to 4-4 in the pumping device 2-2 through the wire 3-7, and the water pumps 4-1 to 4-4 are mobilized to exhaust air to reduce the pressure in the lower conduit of the pumping device 2-2, and water is pumped from the ocean to the water spraying devices 2-4 to 2-7, and water is sprayed from the water spraying devices in the opposite direction of the change of the center of gravity. The floating photovoltaic power generation system is driven by the power of the outward water spraying to return to the predetermined position for operation, and at the same time, the wave load acting on the floating photovoltaic power generation system and the change of the mooring internal force caused by the displacement or rotation are also reduced.

[0080] like Figure 3 , Figure 4 As shown, the top of the outer ring 3-2 is fixed to the rotating shaft 3-6 and can be rotated. The rotating shaft 3-6 passes through the outer ring 3-2. The outer ring 3-2 is connected to the middle ring 3-3 by a rotating connecting rod 3-8. The middle ring 3-3 is connected to the inner ring 3-4 by a rotating connecting rod. The rotating shaft 3-6 passes through the inner ring 3-4. The inner ring 3-4 is connected to the rotor 3-8 by a rotating connecting rod. The rotating shaft 3-6 passes through the rotor 3-8. The center of gravity sensing device 2-1 is composed of a gyroscope 3-1 and a wire 3-7. In order to send the signal of the center of gravity change in time, the bottom of the gyroscope 3-1 is connected to the water pumps 4-1 to 4-4 through a wire. When the floating photovoltaic power generation device is displaced or rotated due to wave load or wind load, the rotor 3-5 rotates around the rotation axis 3-6, the outer ring 3-2 swings back and forth around the rotation axis 3-6, the middle ring 3-3 swings up and down around the rotation axis 3-6, and the inner ring 3-4 swings left and right around the rotation axis 3-6. The wire sends the signal of the center of gravity change to the water pumps 4-1 to 4-4.

[0081] like Figure 5 , Figure 6 , Figure 7As shown, among the water spray devices 2-4 to 2-7, the directions of the front row No. 1 water spray device 2-4, No. 3 water spray device 2-6 and the rear row No. 2 water spray device 2-5, No. 4 water spray device 2-7 are fixed. The spray directions of the No. 1 water spray device 2-4 and No. 2 water spray device 2-5 are horizontally forward and horizontally backward, respectively, mainly reducing the displacement of the center of gravity caused by the longitudinal motion; the spray directions of the No. 3 water spray device 2-6 and No. 4 water spray device 2-7 are horizontally left and horizontally right, respectively, mainly reducing the displacement of the center of gravity caused by the lateral motion, the rolling motion, or the bow motion.

[0082] like Figure 2 , Figure 4 , Figure 5 , Figure 6 , Figure 7 As shown, when the floating photovoltaic power generation device undergoes longitudinal swing motion due to wave load or wind load, the gyroscope 3-1 transmits a signal to the No. 1 water pump 4-1 or the No. 2 water pump 4-2, and the No. 1 water pump 4-1 or the No. 2 water pump 4-2 exhausts air to reduce the pressure in the water suction pipe, and transports water to the No. 1 water spray device 2-4 in the front row or the No. 2 water spray device 2-5 in the back row to spray water, so as to control the floating photovoltaic power generation device to work at a predetermined position; when the floating photovoltaic power generation device undergoes transverse swing motion, roll motion, or bow swing motion due to wave load or wind load, the gyroscope transmits a signal to the No. 3 water pump 4-3 or the No. 4 water pump 4-4, and the No. 3 water pump 4-3 or the No. 4 water pump 4-4 exhausts air to reduce the pressure in the water suction pipe, and transports water to the No. 3 water spray device 2-6 in the front row or the No. 4 water spray device 2-7 in the back row, so as to control the floating photovoltaic power generation device to work at a predetermined position.

[0083] Finally, it should be noted that the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making any creative work are within the scope of protection of the present application.

[0084] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A floating photovoltaic power generation device equipped with a water spray dynamic positioning system, characterized in that: These include, At least one floating photovoltaic power generation system comprising: A photovoltaic support comprises a bottom surface formed by horizontal support rods and oblique support rods obliquely connected to the horizontal support rods. a buoy connected to the bottom surface to provide buoyancy, A photovoltaic power generation panel, which is supported by the oblique support rod; A water-spraying dynamic positioning system is installed between horizontal support rods, and the water-spraying dynamic positioning system includes: A water pumping device comprising a water pump, A gravity center sensing device is installed on the pumping device, and the gravity center sensing device includes: A gyroscope that measures a center of gravity change signal caused by wave load or wind load, the gyroscope comprising: Axis of rotation, a rotor, which rotates about the rotation axis, The inner ring swings left and right around the rotation axis. The middle ring swings up and down around the rotation axis, The outer ring swings back and forth about the rotation axis, a wire connecting the gyroscope and the water pump to transmit the center of gravity change signal to the water pump, at least one conduit connected to the water pump, At least one water spray device is connected to the conduit, and a water pump adjusts the pressure in the conduit based on the center of gravity change signal, so that the water spray device sprays water in the opposite direction of the center of gravity change to adjust the positioning dynamically in real time.

2. A floating photovoltaic power generation device with a water spraying dynamic positioning system according to claim 1, characterized in that: It also includes a mooring system connected to the photovoltaic support, wherein the mooring cable is connected to the photovoltaic support fixed on the seabed.

3. A floating photovoltaic power generation device with a water spraying dynamic positioning system according to claim 1, characterized in that: The floating photovoltaic power generation systems are connected by rubber belts.

4. A floating photovoltaic power generation device with a water-spraying dynamic positioning system according to claim 1, characterized in that: The photovoltaic panel array is arranged with 64 photovoltaic panels.

5. The floating photovoltaic power generation device with a water-spraying dynamic positioning system according to claim 1, characterized in that: The buoy has a diameter of 1200mm and a length of 6630mm.

6. A floating photovoltaic power generation device with a water-spraying dynamic positioning system according to claim 1, characterized in that: The photovoltaic power generation panel is fixed to the oblique support rod through I-beams and channel steels.

7. The floating photovoltaic power generation device with a water-spraying dynamic positioning system according to claim 1, characterized in that: The water spraying device comprises a No. 1 water spraying device in the front row that sprays water horizontally forward, a No. 2 water spraying device in the rear row that sprays water horizontally backward, a No. 3 water spraying device in the front row that sprays water horizontally to the left, and a No. 4 water spraying device in the rear row that sprays water horizontally to the right.

8. The floating photovoltaic power generation device with a water-spraying dynamic positioning system according to claim 1, characterized in that: The water pump adjusts the pressure in the conduit based on the center of gravity change signal so that the water spraying device sprays water in the opposite direction of the center of gravity change.

9. The floating photovoltaic power generation device with a water-spraying dynamic positioning system according to claim 1, characterized in that: Each sprinkler is individually connected to a water pump.

10. The floating photovoltaic power generation device with a water-spraying dynamic positioning system according to claim 1, characterized in that: The floating photovoltaic power generation device has a symmetrical structure.

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