CN115622483A - A device that relies on the self-weight of the water body to bear the negative wind lift of a large-span flexible photovoltaic support - Google Patents

Abstract

The invention discloses a device that relies on the self-weight of the water body to bear the negative wind lift of a large-span flexible photovoltaic support, including a flexible photovoltaic support that spans the entire water area, a photovoltaic module is installed on the flexible photovoltaic support, and the two ends of the flexible photovoltaic support are fixed on both sides of the water area. The side columns are connected to the ground anchor piles on the ground on both banks through diagonal stay rods. The middle part of the flexible photovoltaic support across the water is connected with a tether. The bottom end of the tether is connected to the center of the energy dissipation disc, and the energy dissipation disc sinks into the in water and close to the bottom. The device of the present invention solves the wind load on the flexible support structure, can expand the span of the flexible support, and realizes the construction of photovoltaic power plants over large-span reservoirs, fish ponds, and other water areas, and the groundless anchor pile is convenient for construction without changing the use of water areas properties, does not affect the water use function, and at the same time, the device of the invention drives the water body to move up and down under the action of wind load, has the function of aeration to increase the dissolved oxygen in the water body, is beneficial to the growth of aquatic organisms, and realizes land intensive and environment-friendly photovoltaic power generation.

Description

A device that relies on the self-weight of the water body to bear the negative wind lift of a large-span flexible photovoltaic support

technical field

The invention relates to a device for bearing the negative wind lift force of a large-span flexible photovoltaic support by relying on the self-weight of a water body, and belongs to the technical field of photovoltaic power generation.

Background technique

With the advancement of global industrialization, on the one hand, human demand for energy is increasing, and on the other hand, the tolerance for environmental pollution is getting lower and lower. With the development of hydropower resources in the world's major river basins, the development potential of hydropower resources is obviously insufficient, and new energy sources without pollution represented by solar energy have great development potential and become an ideal substitute for fossil energy. Photovoltaic power generation is based on the principle of the photovoltaic effect. Using photovoltaic modules to directly convert sunlight into electricity is the main way of solar power generation. However, due to the low energy density of solar energy, this makes the photovoltaic power generation system occupy a huge area.

At present, the construction of photovoltaic power plants mainly relies on steel supports in some mountainous, desert, and plain areas with good conditions. The traditional fixed steel bracket is a light steel frame structure with limited spanning capacity. When encountering a fish pond, it is often necessary to lay a large number of prefabricated pile foundations to support steel brackets in the fish pond, which not only affects the use of the fish pond but also increases the cost of the bracket, especially When encountering waters such as deep-water fish ponds, traditional fixed steel supports cannot be implemented. Due to the large area occupied by photovoltaic power plants, with the continuous expansion of installed capacity, the available land resources are decreasing day by day. In recent years, flexible cable structure supports have appeared on some fish ponds. The maximum span of the single-layer cable structure has reached 25m, and the maximum span of the cable truss structure has reached 35m, but this is far from meeting the needs of photovoltaic supports in fish ponds, reservoirs and other water areas. span requirements. It is difficult to provide intermediate support for the support in the water area, and it is difficult for the flexible photovoltaic support on the water surface to be an intermediate ground anchor pile to bear the rising force of the wind load like the land photovoltaic. Wind load is the key factor restricting the span development of the flexible photovoltaic support. It is very important to improve the span of flexible photovoltaic support on the water surface.

After inquiries and searches, there is currently an invention patent "Flexible Photovoltaic Support Wind-resistant Device" (authorized announcement number: CN20915055U, the patentee is Zhejiang Jinggong Energy Technology Group Co., Ltd., and the inventor is Qin Liangzhong, etc.) involves the use of water in flexible photovoltaic supports. The weight of the wind suction is offset by setting the wind sensor and the water pipe on the flexible bracket, and the water volume in the water pipe is adjusted by monitoring the wind pressure in real time to balance the negative wind lift. In this invention, the change of wind force leads to frequent adjustment of water volume, the energy consumption of the wind resistance device itself is too large, and the horizontal and vertical water pipes are densely distributed on the flexible support, which makes the structure redundant and generates additional loads. The utility model patent "A Hydraulic Reel Combined with Photovoltaic Daily Platform for Water Body" (authorized announcement number: CN216774689U, the patentee is Xi'an Jiaotong-Liverpool University, the inventor is Ma Jieming, etc.) discloses an anchored photovoltaic floating island platform, which can be used at any time An anchor block that moves up and down in water depth, and the anchor block relies on its own weight to play an anchoring role. If an anchor block relying on its own weight is used to resist negative wind loads on a flexible photovoltaic support, the volume of the anchor block required due to the buoyancy of the water is large, which is not only uneconomical but also affects the use of water areas; on the other hand, in the case of no wind The self-weight of the anchor block will be applied to the photovoltaic support structure, which will increase the load on the structure, which is not conducive to the large-span development of flexible photovoltaic support.

For the construction of photovoltaic power stations in areas such as reservoirs and deep-water fish ponds, the use of traditional steel supports requires a large number of pilings, which increases the project cost and affects the use of fish ponds. The current single-layer cable structure and cable truss structure cannot solve the problem of wind resistance. Insufficient capacity, most fish ponds are difficult to apply. Through searching, there are no patents and documents of flexible photovoltaic support wind-resistant devices suitable for deep waters.

Contents of the invention

The purpose of the present invention is to provide a device that relies on the self-weight of the water body to bear the negative wind lift force of the large-span flexible photovoltaic support. In the present invention, the energy-dissipating disc relies on the weight of the water body to bear the negative wind-up load, increases the span of the flexible support, and realizes the construction of a photovoltaic power plant over the water area with a large span, without piling within the water area, without changing the nature of land use, and realizing intensive land use. Environmentally friendly photovoltaic power generation.

The technical solution of the present invention: a device that relies on the self-weight of the water body to bear the negative wind lift of a large-span flexible photovoltaic support, including a flexible photovoltaic support that spans the entire water area, a photovoltaic module is installed on the flexible photovoltaic support, and both ends of the flexible photovoltaic support are fixed in the water area The side columns on both sides of the bank are connected to the ground anchor piles on the ground on both sides of the bank through diagonal stay rods. The middle part of the flexible photovoltaic support across the water is connected with a lanyard. The bottom end of the lanyard is connected to the center of the energy dissipation disc, and the energy dissipation disc sinks Into the body of water and close to the bottom.

In the aforementioned device that relies on the self-weight of the water body to bear the negative wind lift of the large-span flexible photovoltaic support, the energy-dissipating disc is an upwardly curved arc structure.

In the aforementioned device that relies on the self-weight of the water body to bear the negative wind lift of the large-span flexible photovoltaic support, the energy-dissipating disc is arrayed with a plurality of drain holes penetrating the top and bottom surfaces of the disc and spiraling along the arc of the disc body.

In the aforementioned device that relies on the self-weight of the water body to bear the negative wind lift of the large-span flexible photovoltaic support, the center of the bottom surface of the energy-dissipating disc is provided with a counterweight.

In the aforementioned device that relies on the self-weight of the water body to bear the negative wind lift of the large-span flexible photovoltaic support, the top end of the tether is connected to the flexible photovoltaic support through a rotatable connection node.

In the above-mentioned device that relies on the self-weight of the water body to bear the negative wind lift of the large-span flexible photovoltaic support, the flexible photovoltaic support includes a load-bearing cable, which is connected to the component installation cable above it through the triangular strut, and the photovoltaic module is laid on the component installation cable. , the top end of the rotatable connection node is fixed on the load-bearing cable.

In the aforementioned device that relies on the self-weight of the water body to bear the negative wind lift of the large-span flexible photovoltaic support, the surface of the energy-dissipating disk is provided with a steel skeleton.

Beneficial effects of the present invention: Compared with the prior art, the device of the present invention has the following advantages:

①By relying on the weight of the water body to bear the negative wind lift of the large-span flexible photovoltaic support through the energy-dissipating disc, compared with the traditional anchoring method, there is no need to lay ground anchor piles in cross-domain waters such as fish ponds, no earthwork excavation, and no environment Affect construction is simpler;

②Compared with the patented "Flexible Photovoltaic Support Wind-resistant Device", the wind-resistant device has no energy consumption, does not need to arrange redundant water pipes on the flexible support, and the construction is simpler;

③Compared with the patent "A Hydraulic Reel Combined with Photovoltaic Daily Platform for Water Body" which relies on the self-weight of the anchor block to provide the anchoring force, the present invention uses the energy-dissipating disc to provide the anchoring force by relying on the weight of the water body itself, which can save 95.5% of the material %, reduce the additional load by 95.5%;

④ During the up-and-down movement of the energy-dissipating disc of the present invention, it will drive the water body to rise and fall, so that the wind-resistant device can also be used as a non-energy-consuming aerator.

The device of the present invention solves the wind load on the flexible support structure, can expand the span of the flexible support, and realizes the construction of photovoltaic power plants over large-span reservoirs, fish ponds, and other water areas, and the groundless anchor pile is convenient for construction without changing the use of water areas properties, does not affect the water use function, and at the same time, the device of the invention drives the water body to move up and down under the action of wind load, has the function of aeration to increase the dissolved oxygen in the water body, is beneficial to the growth of aquatic organisms, and realizes land intensive and environment-friendly photovoltaic power generation.

Device of the present invention compared with existing patents

In an embodiment where the water depth of a fish pond is greater than 5m, the 100m-span flexible photovoltaic support structure needs to resist a wind load of 100kN at the anchor point of 35m and 65m.

1. adopt the present invention to set the disc diameter to be 1.6m, the average thickness is 0.15m, the wind load is an impact load, and at the instant of the wind load, the self-weight of the water body above the disc will be applied on the disc. The 1.6m energy-dissipating disc can resist the wind load by relying on the self-weight of the water body.

式中γ_水为水的重度为10KN/m³，h为圆盘以上水深，A为圆盘面积。

In the formula, γ _water is water with a gravity of 10KN/m ³ , h is the water depth above the disc, and A is the area of the disc.

消能圆盘自重＝0.3×(γ_混凝土-γ_水)，圆盘采取混凝土材质重度γ_混凝土为 25KN/m³，0.3m³×(25-10)KN/m³＝4.5KN。

Self-weight of the energy dissipation disc = 0.3×(γconcrete- _γwater ), the disc is made of _concrete with a weight of _γconcrete of 25KN/m ³ , 0.3m ³ ×(25-10)KN/m ³ =4.5KN.

②If the patent "A Hydraulic Reel Combined with Photovoltaic Daily Platform for Water Body" is adopted, it relies on the weight of the anchor block to resist the negative wind load.

(γ _concrete -γ _water ) V _concrete = F _{negative wind force} (25-10) V _concrete = 100kN

_Vconcrete =6.67m ³ , 2×2×1.7=6.8m ³ >6.67m ³ .

A 6.67m ³ concrete anchor block is required to resist the wind load by the weight of the concrete itself. The anchor block has a length and width of 2m and a height of 1.7m. The large size will easily affect the water use function. In addition, under the action of no wind or positive wind, the anchor block's own weight of 100kN will be applied to the flexible support structure, and the additional load will lead to an increase in the amount of steel used in the cable structure.

Table 1 Comparison table of materials and additional loads

Comparison conclusion: From the comparison of Table 1, it can be seen that the device of the present invention can save 95.5% of concrete materials and reduce additional load by 95.5%.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Figure 2 is a partial enlarged schematic view of Figure 1;

Fig. 3 is a large sample elevation view of the device of the present invention;

Fig. 4 is the plane view of the energy dissipation disc;

Fig. 5 is a schematic diagram of the connection structure between the present invention and the photovoltaic module.

Reference signs: 1-rotatable connection node, 2-lanyard, 3-energy dissipation disc, 4-counterweight, 5-drainage hole, 6-water body, 7-steel skeleton, 8-photovoltaic module, 9- Bearing cable, 10-triangular brace, 11-component mounting cable.

detailed description

The present invention will be further described below in conjunction with the accompanying drawings and embodiments, but not as a basis for limiting the present invention.

Embodiment of the present invention: a device that relies on the self-weight of the water body to bear the negative wind lift of a large-span flexible photovoltaic support, as shown in Figure 1-5, includes a flexible photovoltaic support that spans the entire water area, and a photovoltaic module 8 is installed on the flexible photovoltaic support The two ends of the flexible photovoltaic support are fixed on the side columns on both sides of the water area and connected to the ground anchor piles on the ground on both sides of the water area through diagonal stays. The center of the energy disc 3, the energy dissipation disc 3 sinks into the water body 6 and is close to the bottom of the water.

The energy dissipation disc 3 is placed below the water surface, as close to the bottom of the water as possible, and is not fixed on the bottom of the water. The energy dissipation disc 3 does not affect the use function of the water area. Under the action of negative wind load, the structure of the photovoltaic support rises so that the lanyard 2 pulls the energy dissipation disk 3 up, and the water body 6 above the energy dissipation disk presses on the energy dissipation disk 3, exerting downward pressure on the energy dissipation disk 3 , thus relying on the weight of the water body 6 and the viscous force of the water body to provide negative wind resistance. The lanyard 2 is connected to the central position of the energy dissipation disk 3, thereby ensuring that the energy dissipation disk 3 is always in a horizontal state.

The energy dissipation disk 3 is an upwardly curved arc structure, and the lower surface is a convex surface, which is beneficial for the energy dissipation disk 3 to quickly fall back to its original position after the negative wind load is applied. The concave surface of the upper surface is beneficial for the energy dissipation disk 3 gather water, increase the rising difficulty of energy dissipation disc 3 under negative wind effect.

The energy dissipation disc 3 is provided with a plurality of drainage holes 5 penetrating its top and bottom surfaces in an array. The openings of the drainage holes 5 follow the circular arc of the disc body in a spiral direction, which can slow down the drainage speed and release the impact energy of the negative wind load to achieve the purpose of energy dissipation. Under the action of negative wind load, the energy dissipation disk 3 rises and drains water tangentially along the circular arc downwards, pushing the disk to rotate. Under the principle of conservation of angular momentum, the energy dissipation disk 3 is not easy to overturn.

The center of the bottom surface of the energy dissipating disc 3 is provided with a counterweight 4, which lowers the center of gravity of the energy dissipating disc 3, ensures that the position of the energy dissipating disc 3 is correct in the water, and automatically returns to the predetermined design after the wind load acts on it. The position is automatically corrected after deflection under the action of water flow. Counterweight 4 materials can be selected, such as iron, lead and other dense materials.

The top end of the lanyard 2 is connected to the flexible photovoltaic support through a rotatable connection node 1 . The rotatable connection node 1 is a 360° rotatable connection node to ensure that the lanyard 2 does not twist.

The flexible photovoltaic support includes a load-bearing cable 9, the load-bearing cable 9 is connected to the component installation cable 11 above it through the triangular brace 10, the component installation cable 11 is laid with a photovoltaic module 8, and the top of the rotatable connection node 1 is fixed on the load-bearing cable. 9 on.

A steel skeleton 7 is arranged on the body of the energy dissipation disk 3 to ensure the strength and rigidity of the energy dissipation disk 3 and maintain the shape of the energy dissipation disk 3 .

Under the action of wind load, the energy dissipation disk 3 moves up and down, drives the water body to rise and fall, and has the effect of aeration. It can also be used as an aerator when applied to fish pond photovoltaics.

The present invention can adjust the water entry depth of the energy dissipation disc 3 according to the water depth of the water area used, and it should be as close to the bottom of the water as possible so as not to affect the water area use functions such as sailing and fishing.

The present invention can adjust the number of devices according to the span of the flexible support, and increase the span of the flexible photovoltaic support by increasing the number of devices of the present invention.

Claims (7)

1. The utility model provides a device that flexible photovoltaic support negative wind lift was strideed greatly to rely on water dead weight, is including strideing across the flexible photovoltaic support in whole waters, installs photovoltaic module (8) on the flexible photovoltaic support, and flexible photovoltaic support both ends are fixed on the boundary pillar of waters both sides and are connected its characterized in that through oblique pull rod and the subaerial ground anchor pile of both sides: the middle part of the flexible photovoltaic support crossing the water area is connected with a lanyard (2), the bottom end of the lanyard (2) is connected with the center of an energy dissipation disc (3), and the energy dissipation disc (3) is sunk into a water body (6) and is close to the water bottom.

2. The device for bearing negative wind lift force of the large-span flexible photovoltaic support by means of the self weight of the water body according to claim 1, is characterized in that: the energy dissipation disc (3) is of an arc-shaped structure which is bent upwards.

3. The device for bearing the negative wind lift force of the large-span flexible photovoltaic bracket by means of the self weight of the water body according to claim 1, is characterized in that: the energy dissipation disc (3) is provided with a plurality of drain holes (5) which run through the top and bottom surfaces of the energy dissipation disc and spirally move along with the arc of the disc body.

4. The device for bearing negative wind lift force of the large-span flexible photovoltaic support by means of the self weight of the water body according to claim 1, is characterized in that: and a balancing weight (4) is arranged at the center of the bottom surface of the energy dissipation disc (3).

5. The device for bearing negative wind lift force of the large-span flexible photovoltaic support by means of the self weight of the water body according to claim 1, is characterized in that: the top end of the lanyard (2) is connected with the flexible photovoltaic bracket through the rotatable connecting node (1).

6. The device for bearing negative wind lift force of the large-span flexible photovoltaic support by means of the self weight of the water body according to claim 5, is characterized in that: the flexible photovoltaic support comprises a bearing cable (9), the bearing cable (9) is connected with an assembly mounting cable (11) above the bearing cable through a triangular supporting rod (10), a photovoltaic assembly (8) is laid on the assembly mounting cable (11), and the top end of the rotatable connecting node (1) is fixed on the bearing cable (9).

7. The device for bearing the negative wind lift force of the large-span flexible photovoltaic bracket by means of the self weight of the water body according to claim 1, is characterized in that: the surface of the energy dissipation disc (3) is provided with a steel skeleton (7).

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