Stone desertification area photovoltaic power station field area system matrix grounding device

Abstract

The utility model provides a system matrix grounding device for a photovoltaic power station field in a stony desertification area, which relates to the technical field of lightning protection and grounding of the photovoltaic power station field in the stony desertification area, and comprises a photovoltaic group string, an assembly bracket arranged at the bottom of the photovoltaic group string, a pile arranged at the bottom of the assembly bracket, and a lightning protection and grounding structure arranged in the pile; the photovoltaic group strings are connected through steel strands, a plurality of photovoltaic group strings form a photovoltaic array, and the photovoltaic arrays are mutually connected through horizontal grounding; and the photovoltaic array is connected with the plurality of vertical grounds through the horizontal ground. According to the utility model, the photovoltaic power station field area system matrixes are connected into a whole through the photovoltaic group strings, the whole matrix is used as a grounding system, material arrangement is saved, and the utilization rate is improved; the horizontal grounding part and the vertical grounding part are made of hot-dip galvanized steel, so that the system square matrix can effectively discharge current when being struck by lightning, annular grounding flat steel of the system square matrix is saved, and the grounding work amount is optimized.

Description

Technical Field

[0001] The utility model relates to the technical field of lightning protection and grounding of photovoltaic power stations in rocky desertification areas, in particular to a system array of photovoltaic power stations in rocky desertification areas. Background Art

[0002] The lightning protection grounding of the mountain photovoltaic power station system generally adopts a ring grounding method. This method uses two grounding flat steels to connect between the arrays through a 0.8 / 1m grounding trench. In the array, the horizontal photovoltaic component strings are connected one by one with steel strands, and finally a ring grounding system is formed. To ensure the effectiveness of the field grounding, the grounding resistance value must be less than or equal to 4Ω. However, in mountainous rocky desertification areas, conventional grounding methods cannot be applied because the rocky desertification makes it impossible to dig the grounding flat steel to a depth of 0.8 / 1m for burial, which makes the construction difficult and the cost high. At the same time, the resistivity of the rocky desertification area is high, which makes the grounding resistance unable to meet the design requirement of less than or equal to 4Ω. Therefore, a lightning protection layout method for photovoltaic power stations in rocky desertification areas is urgently needed.

[0003] Announcement No. CN206282981 U discloses a mountain photovoltaic power station lightning protection grounding system and a photovoltaic field lightning protection grounding device, including a collection station lightning protection grounding device and a photovoltaic field lightning protection grounding device, the photovoltaic field grounding device includes a photovoltaic field grounding conductor, a battery group string grounding device, and a photovoltaic field grounding test well device, the photovoltaic field grounding conductor package extends in the horizontal direction and is arranged around the field area of ​​the photovoltaic field, the inter-column horizontal grounding conductor conductively connected to the adjacent battery group string grounding device, and the transitional horizontal grounding conductor conductively connected to the battery group string grounding device and the peripheral horizontal grounding conductor. After analysis, the structural features adopted in the public document are not the same as those of the utility model. Summary of the invention

[0004] The utility model provides a square array grounding device for a photovoltaic power station system in a rocky desertification region, aiming to solve at least one technical problem existing in the prior art mentioned in the background technology.

[0005] The utility model provides the following technical solutions to achieve the above objectives:

[0006] A square array grounding device for a photovoltaic power station system in a rocky desertification region comprises a plurality of parallel horizontal photovoltaic strings, the two ends of which are connected in sequence through horizontal grounding to form a photovoltaic array, the horizontal grounding is arranged around the edge of the photovoltaic array to form a closed path, and the edge of the photovoltaic array extends outward to connect with a plurality of vertical groundings; the horizontal photovoltaic string is composed of more than one photovoltaic group, and the plurality of photovoltaic groups are connected in sequence through steel strands; a photovoltaic bracket is arranged at the bottom of the photovoltaic group, the photovoltaic bracket comprises a plurality of vertical pillars, the bottom of the vertical pillars is arranged on a cast-in-place pile, and the cast-in-place pile is inserted into the ground; the cast-in-place pile comprises a pile body and a lightning protection grounding structure arranged in the pile body, and the photovoltaic bracket and the lightning protection grounding structure form a path.

[0007] Furthermore, the cast-in-place piles are 10 independent cast-in-place pile foundations.

[0008] Furthermore, the lightning protection grounding structure includes a steel cage, and the vertical main bars of the steel cage extend from the bottom of the pile foundation and are inserted into the soil.

[0009] Furthermore, the lightning protection grounding structure includes three vertically arranged hot-dip galvanized steel pipes, the three hot-dip galvanized steel pipes are connected by a plurality of transverse steel pipes, and the three hot-dip galvanized steel pipes extend from the bottom of the pile foundation and are inserted into the soil.

[0010] Furthermore, the outside of the horizontal grounding is wrapped with a soil layer, and an insulating layer is arranged on the outside of the soil layer.

[0011] Furthermore, the insulating layer is made of hollow cement bricks.

[0012] Furthermore, the material of the horizontal grounding is 50mm×5mm hot-dip galvanized flat steel.

[0013] Furthermore, the material of the vertical grounding is hot-dip galvanized steel.

[0014] Furthermore, the steel strand is PVC95mm 2 Steel strand.

[0015] Beneficial Effects

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] 1. The utility model connects the photovoltaic power station area system array into one through photovoltaic strings, and the entire array serves as a grounding system, saving material layout and improving utilization.

[0018] 2. The utility model uses hot-dip galvanized steel to make horizontal grounding and vertical grounding, which fully ensures that the system array can effectively discharge when struck by lightning, while saving the system array annular grounding flat steel and optimizing the grounding engineering workload.

[0019] 3. The main steel bars of the cast-in-place piles in the utility model extend outward into the soil and are used as vertical grounding electrodes, which can increase the contact points between the field system and the earth and fully ensure the effective grounding of the field system;

[0020] 4. In order to ensure the effectiveness of grounding in the utility model, hot-dip galvanized steel pipes are used as the skeleton of the cast-in-place piles and extend into the soil as vertical grounding electrodes to improve the effectiveness of lightning protection grounding. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below only relate to some embodiments of the utility model, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor.

[0022] Figure 1 It is a schematic diagram of the arrangement of the utility model;

[0023] Figure 2 It is a schematic diagram of the pile foundation arrangement of the utility model;

[0024] Figure 3 This is a schematic diagram of the photovoltaic module support and foundation elevation of the utility model;

[0025] Figure 4 It is a cross-sectional schematic diagram of the pile foundation of the utility model;

[0026] Figure 5 This is a schematic diagram of the lightning protection grounding structure of the utility model;

[0027] Figure 6 It is a top view schematic diagram of the lightning protection grounding structure of the utility model;

[0028] Figure numerals: 1-photovoltaic array; 2-vertical grounding; 3-horizontal grounding; 4-photovoltaic string; 5-cast-in-place pile. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiment of the present invention.

[0030] It should be noted that in the present invention: the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or apparatuses; the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside", "outside", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like are based on the directions or positional relationships shown in the drawings. These The terms are mainly used to better describe the utility model and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation; the terms "first", "second", etc. are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence; the terms "install", "set", "provided with", "connected", "connected", "sleeved", etc. should be understood in a broad sense; for example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be an internal connection between two devices, elements or components. In addition, some terms can be used to express other meanings in addition to indicating orientation or positional relationships. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For ordinary technicians in this field, the specific meanings of these terms in the utility model can be understood according to specific circumstances.

[0031] Example 1. A photovoltaic power station system array in a rocky desertification area, with a structure reference Figure 1-3 , including a plurality of parallelly arranged transverse photovoltaic strings 4, the two ends of the transverse photovoltaic strings 4 are connected in sequence through a horizontal ground 3 to form a photovoltaic array, the horizontal ground 3 is arranged around the edge of the photovoltaic array to form a closed path, and the edge of the photovoltaic array extends outward to connect a plurality of vertical grounds 2; the transverse photovoltaic string 4 is composed of more than one photovoltaic group, and the plurality of photovoltaic groups are connected in sequence through steel strands; a photovoltaic bracket is arranged at the bottom of the photovoltaic group, and the photovoltaic bracket includes a plurality of vertical pillars, and the bottom of the vertical pillar is arranged on a cast-in-place pile 5, and the cast-in-place pile 5 is inserted into the ground; the cast-in-place pile 5 includes a pile body and a lightning protection grounding structure arranged in the pile body, and the photovoltaic bracket and the lightning protection grounding structure form a path.

[0032] The lightning protection grounding structure includes a steel cage, and the vertical main steel bars of the steel cage extend from the bottom of the pile foundation and are inserted into the soil. The main steel bars are inserted into the soil for at least 10 cm to effectively ensure the effectiveness of the grounding.

[0033] The horizontal grounding 3 is wrapped with a soil layer, and an insulating layer is arranged outside the soil layer. The insulating layer is made of hollow cement bricks. The horizontal grounding 3 is protected by arranging the soil layer and the insulating layer.

[0034] The material of the horizontal grounding 3 is 50mm×5mm hot-dip galvanized flat steel.

[0035] The material of the vertical grounding 2 is hot-dip galvanized steel. L50×5 hot-dip galvanized angle steel or Φ50 hot-dip galvanized steel pipe with a wall thickness of 3.5mm can be selected; the steel strand is PVC95mm 2 Steel strand.

[0036] Working principle and use method of the utility model: The utility model is specifically used in photovoltaic power station areas in rocky desertification areas. According to the above-mentioned structure, the photovoltaic strings are connected as a whole, and the entire array is used as a grounding system, which saves material layout and improves utilization.

[0037] Example 2. A photovoltaic power station system array in a rocky desertification area, with a structure reference Figure 1-5 , including, this embodiment has a similar structure to embodiment 1 and a same method of use, the difference being that the lightning protection grounding structure in the independent cast-in-place pile foundation comprises three vertically arranged hot-dip galvanized steel pipes, the three hot-dip galvanized steel pipes are connected by a number of transverse steel pipes, the three hot-dip galvanized steel pipes extend from the bottom of the pile foundation and are inserted into the soil, compared with directly using steel bars as the lightning protection grounding structure, the use of hot-dip galvanized steel pipes can greatly improve the conductivity of the lightning protection grounding structure, thereby ensuring the safety of the photovoltaic power station, and the mechanical properties of the hot-dip galvanized steel pipes themselves are not significantly different from those of the steel bars (the yield strength of the hot-dip galvanized steel pipes is 250MPa-350MPa, and the yield strength of the steel bars is 280MPa-380MPa), and using the hot-dip galvanized steel pipes as the cast-in-place pile skeleton can meet the basic structural strength of the photovoltaic power station.

[0038] Obviously, the above is only a part of the embodiments of the utility model, not all of the embodiments. The above embodiments are not used to limit the utility model. For those skilled in the art, the utility model can have various changes and variations. Any combination, modification, equivalent replacement, improvement and all other embodiments that can be made by ordinary technicians in the field within the spirit and principle of the utility model should be within the protection scope of the utility model.

Claims

1. A square array grounding device for a photovoltaic power station system in a rocky desertification area, characterized by: The invention comprises a plurality of parallelly arranged transverse photovoltaic strings (4), the two ends of the transverse photovoltaic strings (4) are connected in sequence through horizontal grounding (3) to form a photovoltaic array, the horizontal grounding (3) is arranged around the edge of the photovoltaic array to form a closed path, and the edge of the photovoltaic array extends outward to connect with a plurality of vertical groundings (2); the transverse photovoltaic string (4) is composed of more than one photovoltaic group, and the plurality of photovoltaic groups are connected in sequence through steel strands; a photovoltaic bracket is arranged at the bottom of the photovoltaic group, and the photovoltaic bracket comprises a plurality of vertical pillars, the bottom of the vertical pillars is arranged on a cast-in-place pile (5), and the cast-in-place pile (5) is inserted into the ground; the cast-in-place pile (5) comprises a pile body and a lightning protection grounding structure arranged in the pile body, and the photovoltaic bracket and the lightning protection grounding structure form a path.

2. The square array grounding device for a photovoltaic power station system in a rocky desertification region according to claim 1 is characterized by: The cast-in-place piles (5) are 10 independent cast-in-place pile foundations.

3. The square array grounding device for a photovoltaic power station system in a rocky desertification region according to claim 2 is characterized by: The lightning protection grounding structure comprises a steel cage, and the vertical main bars of the steel cage extend from the bottom of the pile foundation and are inserted into the soil.

4. The square array grounding device for a photovoltaic power station system in a rocky desertification region according to claim 1 is characterized by: The lightning protection grounding structure comprises three vertically arranged hot-dip galvanized steel pipes, the three hot-dip galvanized steel pipes are connected by a plurality of transverse steel pipes, and the three hot-dip galvanized steel pipes extend from the bottom of the pile foundation and are inserted into the soil.

5. The square array grounding device for a photovoltaic power station system in a rocky desertification region according to claim 1, characterized in that: The horizontal grounding (3) is wrapped with a soil layer on the outside, and an insulating layer is arranged on the outside of the soil layer.

6. The square array grounding device for a photovoltaic power station in a rocky desertification region according to claim 5 is characterized by: The insulating layer is made of hollow cement bricks.

7. The square array grounding device for a photovoltaic power station system in a rocky desertification region according to claim 1, characterized in that: The material of the horizontal grounding (3) is 50mm×5mm hot-dip galvanized flat steel.

8. The square array grounding device for a photovoltaic power station system in a rocky desertification region according to claim 1, characterized in that: The material of the vertical grounding (2) is hot-dip galvanized steel.

9. The square array grounding device for a photovoltaic power station system in a rocky desertification region according to claim 1, characterized in that: The steel strand is PVC95mm 2 Steel strand.

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