A photovoltaic power station integrating agriculture and solar power, set up in terraced fields in a steep mountain valley.

Abstract

This utility model discloses a photovoltaic power station that integrates agriculture and photovoltaics, set up in a steep mountain terrace. It solves the problem of local safe and convenient collection and transmission of current output from multiple box-type transformers of photovoltaic modules deployed on a large area of ​​terraces. Crops (21) are planted on the terraces (19). Box-type transformers (23), 35 kV outdoor high-voltage cable branch boxes (24) and transmission towers (25) are set up on the top of the hillside (18). The output end of the photovoltaic module (20) is connected to the input end of the box-type transformer through an inverter (22) and a cable. The output end of the box-type transformer (23) is connected to the input end of the 35 kV outdoor high-voltage cable branch box (24) through a cable. The output end of the 35 kV outdoor high-voltage cable branch box (24) is connected to the transmission cable (26) on the transmission tower through a cable. The operation of a large-scale photovoltaic power station integrating agriculture and photovoltaics is realized.

Description

Technical Field

[0001] This utility model relates to a mountain photovoltaic power generation device, and more particularly to a photovoltaic power station that integrates agriculture and photovoltaics and is set up in terraced fields in steep mountain valleys. Background Technology

[0002] With the vigorous promotion of photovoltaic power generation, the construction of large-scale photovoltaic power stations is expanding into mountainous areas. Northern hillsides with good sunlight but poor vegetation have become the preferred sites for large-scale photovoltaic power stations, especially in mountain valleys. These valleys are characterized by steep slopes, small diurnal temperature variations, good air quality, and abundant sunshine. Some valleys contain a small number of terraced fields, with significant height differences between adjacent terraces. The slopes between these terraces are characterized by large angles, considerable distances, and irregular shapes, representing transitional slopes unsuitable for cultivation. Deploying large-scale photovoltaic power generation modules in these transitional sections would effectively utilize this uncultivable land, achieving a complementarity between agriculture and photovoltaic power generation—a goal that those skilled in the art have been pursuing. However, how to deploy photovoltaic modules on the slopes between terraces presents a significant challenge for on-site construction. Furthermore… On hillsides where large-scale photovoltaic panels are deployed, box-type transformers and transmission lines are needed to convert the photovoltaic power generated on the hillside into transmittable alternating current, which is then transmitted to a substation via transmission towers. Drop-out fuses are required on these locally installed transmission towers to control and protect the lines, quickly cutting off current in case of a fault to prevent equipment damage and escalation of the accident. However, for large-area, centralized photovoltaic power generation areas, the large size of the concentrated photovoltaic modules necessitates the configuration of multiple box-type transformers. The current output from these transformers is collected locally before being output through drop-out fuses, leading to insufficient load capacity of existing drop-out fuses to meet the requirements of the collected current. Furthermore, existing drop-out fuses are all installed on towers, posing installation and maintenance difficulties. Another issue that needs to be addressed is how to conveniently control the box-type transformers in groups.

[0003] For large-scale mountain photovoltaic installations on hillsides, box-type transformers are installed on-site near the photovoltaic modules. These box-type transformers need to be installed on a foundation platform to adapt to the harsh climate of the mountainous area. The existing foundation platform for the box-type transformers needs to be set on pile foundations. However, the construction of the pile foundations requires large construction equipment to enter the site. Due to the steep terrain and narrow mountain roads at the construction site, large construction equipment simply cannot enter the site to carry out the construction. Summary of the Invention

[0004] This utility model provides a photovoltaic power station that integrates agriculture and photovoltaics, set up in terraced fields in steep mountain valleys. It solves the technical problem of local safe and convenient collection and transmission of current output from multiple box-type transformers of photovoltaic modules deployed over a large area of ​​terraced fields.

[0005] This utility model solves the above technical problems through the following technical solution:

[0006] A photovoltaic power station integrating agriculture and photovoltaics, set up in steep mountain terraces, includes steep mountain terraces, photovoltaic modules are installed on the slopes between the steep mountain terraces, crops are planted on the terraces, and box-type transformers, 35 kV outdoor high-voltage cable branch boxes and transmission towers are respectively installed at the top of the slopes. The output end of the photovoltaic modules is connected to the input end of the box-type transformer through an inverter and then through a cable. The output end of the box-type transformer is connected to the input end of the 35 kV outdoor high-voltage cable branch box through a cable. The output end of the 35 kV outdoor high-voltage cable branch box is connected to the transmission cable on the transmission tower through a cable.

[0007] The foundation platform comprises a collapsible loess and gravel slope, I-beams, and a steel plate platform. Six pile foundation pits are spaced apart on the collapsible loess and gravel slope. In each pile foundation pit, a PVC corrugated pipe is installed vertically, with the top of the PVC corrugated pipe extending 1000 mm above the ground. A corrugated pipe reinforcement cage and cast-in-place concrete are installed inside the PVC corrugated pipe. Platform connecting bolts are pre-embedded at the top ends of the PVC corrugated pipes. Through holes are provided on the lower flange of the I-beams. I-beams are installed between the top ends of adjacent PVC corrugated pipes. The platform connecting bolts are movably fitted into the through holes, and anti-loosening nuts are screwed onto the top of the connecting bolts. A steel plate platform is welded to the top surface of the upper flange of the I-beams.

[0008] Micro-hole cast-in-place piles are installed at the bottom of the pile foundation pit. The micro-hole cast-in-place pile reinforcement cage is welded to the corrugated pipe reinforcement cage. Cast-in-place concrete is installed in the pile foundation pit outside the PVC corrugated pipe.

[0009] An oil storage tank is buried in the collapsible loess and gravel slope between the two pile foundation pits directly below the steel plate platform; a long concrete slab is set on the slope on one side of the steel plate platform, and a stair connecting steel plate is pre-embedded in the long concrete slab. The lower end of the steel integral staircase is welded to the stair connecting steel plate, and the upper end of the steel integral staircase is connected with angle steel. The upper end of the steel integral staircase is movably connected to the steel plate platform through the angle steel; a guardrail is set around the steel plate platform, and a box-type transformer is installed on the steel plate platform.

[0010] This invention enables the large-scale deployment of photovoltaic power generation areas in steep mountain terraces, achieving agricultural-photovoltaic complementarity. It does not affect the cultivation of rural crops and fully utilizes steep slopes. Furthermore, by installing a 35 kV outdoor high-voltage cable branch box at the top of the slope, it solves the problem of combining and transmitting photovoltaic power from multiple box-type transformers on-site. On-site construction and subsequent operation and maintenance are simple and easy, making it particularly suitable for large-scale mountain photovoltaic power stations. On collapsible loess and gravel slopes, only a pit approximately 1 meter deep and 500 mm in diameter needs to be manually excavated. A microporous injection column is then installed at the bottom of the pit, and a large-diameter PVC corrugated pipe is placed into the pit. A steel cage is installed inside the pipe and concrete is poured to form a cast-in-place concrete column higher than the ground, making the micro-hole pile and the column a whole pile foundation. This reduces the difficulty of on-site construction, eliminates the need for large pile foundation construction equipment, and can be completed manually. The six pile foundation columns are connected to the steel platform in a movable manner, avoiding rigid tearing of the platform caused by settlement of soft strata, and providing convenient conditions for setting up support pads for the platform in case of pile foundation settlement. The ladder and platform are designed to be movable and close together, which also avoids the risk of tearing of the platform due to ground settlement at the ladder location. The overall construction cost of the platform is low, and the platform is better adapted to soft strata mountainous environments. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model;

[0012] Figure 2 is a structural schematic diagram of the prefabricated substation foundation platform of this utility model in the front view direction;

[0013] Figure 3 is a schematic diagram of the structure of the transformer substation foundation platform of this utility model in the side view direction;

[0014] Figure 4 is a structural schematic diagram of the steel integral staircase 16 of the transformer substation foundation platform of this utility model. Detailed Implementation

[0015] The present invention will now be described in detail with reference to the accompanying drawings:

[0016] A photovoltaic power station integrating agriculture and solar power, set up in terraced fields in a steep mountain valley, includes terraced fields 19. Due to the steep terrain, the distance between the two terraces is relatively large, and the slope 18 between the terraced fields 19 is quite long, on which large-area photovoltaic modules 20 can be installed. Crops 21, such as beans and other low-growing crops, are planted on the terraced fields 19. At the top of the slope 18, a box-type transformer 23, a 35 kV outdoor high-voltage cable branch box 24, and a transmission tower 25 are respectively installed. The output end of the photovoltaic modules 20 is connected to the input end of the box-type transformer 23 via an inverter 22 and a cable. The output end of the box-type transformer 23 is connected to the input end of the 35 kV outdoor high-voltage cable branch box 24 via a cable. The input terminals of the 5 kV outdoor high-voltage cable branch boxes 24 are connected together. To meet the requirements of large-area photovoltaic power generation areas, multiple box-type transformers 23 are equipped on site. Each box-type transformer serves a group of photovoltaic power generation areas. These box-type transformers 23 are all connected to the 35 kV outdoor high-voltage cable branch boxes 24. The 35 kV outdoor high-voltage cable branch boxes 24 are equipped with multiple sets of drop-out fuses, which control and manage the corresponding photovoltaic power generation areas respectively. The output terminal of the 35 kV outdoor high-voltage cable branch boxes 24 is connected to the transmission cable 26 on the transmission tower 25 through a cable. The transmission cable 26 transmits the photovoltaic power generated on site to the step-up substation, and the stepped-up photovoltaic power is then connected to the power grid.

[0017] The foundation platform for the photovoltaic power station's box-type transformer includes a collapsible loess and gravel slope 1, an I-beam steel beam 8, and a steel plate platform 11. The mountainous terrain consists of collapsible loess and gravel layers, with an unstable geological structure prone to collapse and landslides. Six pile foundation pits 2 are spaced apart on the collapsible loess and gravel slope 1, arranged in a matrix. Due to the relatively soft soil, the pile foundation pits 2 can be excavated manually or with a small excavator. In each pile foundation pit 2, a PVC corrugated pipe 3 is installed vertically, with its top end 1000 mm above the ground. A corrugated pipe reinforcement cage 4 and cast-in-place concrete 5 are installed inside the PVC corrugated pipe 3. Platform connecting bolts 7 are pre-embedded at the top end of the PVC corrugated pipe 3. The PVC corrugated pipe 3 replaces the concrete column casting formwork, forming six concrete columns on the hillside. The lower flange of the I-beam steel beam 8... A through-hole 9 is provided, and an I-beam steel beam 8 is set between the top ends of adjacent PVC corrugated pipes 3. The platform connecting bolt 7 is movably sleeved in the through-hole 9, and an anti-loosening nut 10 is screwed to the top of the connecting bolt 7. One I-beam steel beam 8 can be set on the three concrete columns on the front side, and another I-beam steel beam can be set on the three concrete columns on the rear side. A steel plate platform 11 is welded to the top surface of the upper flange plate of the two I-beam steel beams 8. This makes the entire steel platform and the six columns in a movable overlapping state. When one of the columns settles, it will not exert rigid pull on the steel platform, protecting the stability of the steel platform and creating conditions for timely on-site handling. The entire steel platform is pressed against the six columns by its own weight and is in a stable operating state. The anti-loosening nut 10 also ensures that the columns and the steel platform will not be separated in the event of settlement. The diameter of the through-hole 9 is larger than the outer diameter of the platform connecting bolt 7, but smaller than the diameter of the anti-loosening nut 10.

[0018] Micro-hole cast-in-place piles are installed at the bottom of the pile foundation pit 2. The micro-hole cast-in-place pile reinforcement cage is welded to the corrugated pipe reinforcement cage 4. The micro-hole cast-in-place piles are generally installed on the rock below the collapsible loess and gravel layer to make the entire pile foundation more stable. Cast-in-place concrete 6 is installed in the pile foundation pit 2 outside the PVC corrugated pipe 3 to make the column form a stable state with a larger bottom and a smaller top.

[0019] An oil storage tank 13 is buried in the collapsible loess and gravel slope 1 between the two pile pits 2 directly below the steel plate platform 11. The oil drain pipe of the transformer on the platform is connected to the oil storage tank 13. The oil storage tank 13 replaces the cast-in-place concrete oil storage pool, which is convenient for construction, operation and maintenance. A concrete strip 14 is set on the slope on one side of the steel plate platform 11. A stair connecting steel plate 15 is pre-embedded in the concrete strip 14. The lower end of the steel integral staircase 16 is welded to the stair connecting steel plate 15. Angle steel 17 is connected to the upper end, and the upper end of the steel integral staircase 16 is movably connected to the steel plate platform 11 through angle steel 17. This utility model movably connects the integral steel platform, concrete foundation column and climbing ladder, which is adapted to the soft mountain terrain environment and ensures that the steel platform is deformed as little as possible. At the same time, the entire steel platform is suspended in the air, which plays a role in resisting mountain floods and is also conducive to ventilation and heat dissipation during the operation of the box-type transformer. Guardrails 12 are set around the steel plate platform 11, and the box-type transformer is installed on the steel plate platform 11.

Claims

1. A kind of agricultural photovoltaic power station of complementary photovoltaic power generation arranged in steep mountain nest terrace, including steep mountain nest terrace (19), photovoltaic module (20) is arranged on the mountain slope (18) between steep mountain nest terrace (19), crops (21) are planted on terrace (19), it is characterized in that, At the top of the hillside (18), there are box-type transformers (23), 35 kV outdoor high-voltage cable branch boxes (24) and transmission towers (25). The output end of the photovoltaic module (20) is connected to the input end of the box-type transformer (23) through the inverter (22) and then through the cable. The output end of the box-type transformer (23) is connected to the input end of the 35 kV outdoor high-voltage cable branch box (24) through the cable. The output end of the 35 kV outdoor high-voltage cable branch box (24) is connected to the transmission cable (26) on the transmission tower (25) through the cable.

2. The photovoltaic power station of claim 1, wherein, The box-type transformer (23) is set on the foundation platform, which is located on the slope of collapsible loess and gravel layer (1) at the top of the slope. Six pile foundation pits (2) are set at intervals on the slope of collapsible loess and gravel layer (1). In each pile foundation pit (2), a PVC corrugated pipe (3) is set in the vertical direction. The top of the PVC corrugated pipe (3) is 1000 mm above the ground. A corrugated pipe steel cage (4) and cast-in-place concrete (5) are set in the PVC corrugated pipe (3). Platform connecting bolts (7) are pre-embedded on the top port of 3); through holes (9) are provided on the lower flange plate of the I-beam (8), and I-beams (8) are provided between the top ends of adjacent PVC corrugated pipes (3). Platform connecting bolts (7) are movably sleeved in through holes (9), and anti-loosening nuts (10) are screwed on the top end of connecting bolts (7); a steel plate platform (11) is welded to the top surface of the upper flange plate of the I-beam (8), and a box-type transformer (23) is installed on the steel plate platform (11). 3.The photovoltaic power station of claim 2, wherein, Micro-hole cast-in-place piles are installed at the bottom of the pile foundation pit (2). The micro-hole cast-in-place pile reinforcement cage is welded to the corrugated pipe reinforcement cage (4). Cast-in-place pipe concrete (6) is installed in the pile foundation pit (2) outside the PVC corrugated pipe (3).

4. The photovoltaic power station of claim 3, wherein, An oil storage tank (13) is buried in the collapsible loess and gravel slope (1) between the two pile foundation pits (2) directly below the steel plate platform (11); a concrete strip (14) is set on the slope on one side of the steel plate platform (11), and a stair connecting steel plate (15) is pre-embedded in the concrete strip (14). The lower end of the steel integral staircase (16) is welded to the stair connecting steel plate (15), and an angle steel (17) is connected to the upper end of the steel integral staircase (16). The upper end of the steel integral staircase (16) is movably connected to the steel plate platform (11) through the angle steel (17); a guardrail (12) is set around the steel plate platform (11).

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