A method for evaluating the grounding system and its geoelectric model based on distributed photovoltaic field

Abstract

The present invention discloses a grounding system based on a distributed photovoltaic field and a method for evaluating its geoelectric model, which belongs to the field of grounding technology for new energy power systems. It mainly includes a voltage-stabilized power supply generator, a high-resistance voltage recording device, a central support rod, a spherical fastener, a metal probe, a telescopic sub-rod, a connecting wire, a push pin buckle, etc. The apparent electrical parameters of the earth around the distributed photovoltaic power station are tested through a bipolar arrangement on both sides, and the apparent electrical parameters of the earth around the distributed photovoltaic power station at different positions are measured to obtain the core evaluation factors of the geoelectric model for the grounding system of the distributed photovoltaic power station. The present invention can fully consider the spatial characteristics of distributed resources, and can reliably evaluate the core evaluation factors of the geoelectric model for the grounding system of the distributed photovoltaic power station, providing important model and data support for ensuring the reliable access of various distributed resources and the grounding safety design of new power systems.

Description

Technical Field

[0001] The present invention belongs to the technical field of grounding of new energy power systems, and in particular relates to a geoelectric model evaluation method based on a distributed photovoltaic field grounding system. Background Art

[0002] The research and construction of new power systems based on new energy sources are of great significance to the realization of the strategic goals of carbon peak and carbon neutrality. Driven by the "dual carbon" goals, distributed resources such as distributed power sources and energy storage have developed rapidly, accelerating the development and application of new energy clusters, and emerging the "double high" new characteristics of high proportion of clean energy and high proportion of power electronic equipment. At the same time, a large number of system transient overvoltage problems have also been introduced. The distributed resource grounding system is an important part of the new power system. Its reliable grounding design is the basis for transient overvoltage protection of the new energy access system, and plays an irreplaceable role in ensuring the safety and stable operation of energy and electricity. The distributed resource system has the advantages of low pollution and outstanding environmental benefits. Although distributed resources (such as photovoltaic power stations) can alleviate the power shortage in local areas to a certain extent, their system capacity generally needs to be adjusted according to site requirements. Therefore, higher requirements are put forward for the safety design and discharge effect of its grounding system, and its geoelectric model needs to be refined. At present, the research on geoelectric models is mainly focused on the grounding system of large main grid power stations. However, for the transient overvoltage problem of new energy access systems, there is a lack of geoelectric parameter testing platforms and model evaluation methods that consider the spatial influence of distributed resources, especially in the technical transformation of the grounding system of new energy power stations. There is a lack of relevant parameter modeling technology. In order to better improve the accuracy of the design of distributed resource grounding systems, it is urgent to study the geoelectric model evaluation method based on distributed resource grounding systems, which can provide important data support for ensuring the reliable access of various distributed resources and the robustness of new power systems. Summary of the invention

[0003] The purpose of the present invention is to solve the deficiencies of the prior art and to provide a geoelectric model evaluation method based on a distributed photovoltaic field grounding system.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0005] A distributed photovoltaic field grounding system includes a distributed photovoltaic sub-station 1, a distributed photovoltaic sub-station 2, a distributed photovoltaic sub-station 3 and a distributed photovoltaic sub-station 4, wherein a central support pole is located in the middle area of ​​the four;

[0006] The central support rod is respectively connected to the telescopic sub-rod 2, the telescopic sub-rod 3, the telescopic sub-rod 6 and the telescopic sub-rod 7, and the connection relationships are respectively:

[0007] The telescopic sub-rod 2 is connected to the telescopic sub-rod 1 through the spherical fastener 2, and the other end of the telescopic sub-rod 1 is provided with a spherical fastener 1; the spherical fastener 2 is connected to the metal probe 2 through the push pin buckle 2, and the spherical fastener 1 is connected to the metal probe 1 through the push pin buckle 1;

[0008] The telescopic sub-rod 3 is connected to the telescopic sub-rod 4 through the spherical fastener 3, and the other end of the telescopic sub-rod 4 is provided with a spherical fastener 4; the spherical fastener 3 is connected to the metal probe 3 through the push pin buckle 3, and the spherical fastener 4 is connected to the metal probe 4 through the push pin buckle 4;

[0009] The telescopic sub-rod 6 is connected to the telescopic sub-rod 5 through a spherical fastener 6, and the other end of the telescopic sub-rod 5 is provided with a spherical fastener 5; a metal probe 6 is connected to the spherical fastener 6 through a push pin buckle 6, and a metal probe 5 is connected to the spherical fastener 5 through a push pin buckle 5;

[0010] The telescopic sub-rod 7 is connected to the telescopic sub-rod 8 through the spherical fastener 7, and the other end of the telescopic sub-rod 8 is provided with a spherical fastener 8; a metal probe 7 is connected to the spherical fastener 7 through a push pin buckle 7, and a metal probe 8 is connected to the spherical fastener 8 through a push pin buckle 8;

[0011] The central support rod, push pin buckle 1, push pin buckle 2, push pin buckle 3, push pin buckle 4, push pin buckle 5, push pin buckle 6, push pin buckle 7 and push pin buckle 8 are all perpendicular to the earth;

[0012] The telescopic sub-rod 1, the telescopic sub-rod 2, the telescopic sub-rod 3 and the telescopic sub-rod 4 are arranged on the same line; the telescopic sub-rod 5, the telescopic sub-rod 6, the telescopic sub-rod 7 and the telescopic sub-rod 8 are arranged on the same line; and the telescopic sub-rod 1, the telescopic sub-rod 2, the telescopic sub-rod 3, the telescopic sub-rod 4, the telescopic sub-rod 5, the telescopic sub-rod 6, the telescopic sub-rod 7 and the telescopic sub-rod 8 are located on the same plane;

[0013] The metal probe 1 is electrically connected to the voltage-stabilized power supply generator 1 through the connecting wire 1, and the metal probe 2 is electrically connected to the voltage-stabilized power supply generator 1 through the connecting wire 2; the metal probe 3 is electrically connected to the high-resistance voltage recording device 1 through the connecting wire 3, and the metal probe 4 is electrically connected to the high-resistance voltage recording device 1 through the connecting wire 4; the metal probe 5 is electrically connected to the high-resistance voltage recording device 2 through the connecting wire 5, and the metal probe 6 is electrically connected to the high-resistance voltage recording device 2 through the connecting wire 6; the metal probe 7 is electrically connected to the voltage-stabilized power supply generator 2 through the connecting wire 7, and the metal probe 8 is electrically connected to the voltage-stabilized power supply generator 2 through the connecting wire 8.

[0014] The second telescopic sub-rod and the sixth telescopic sub-rod are perpendicular to each other; the third telescopic sub-rod and the seventh telescopic sub-rod are perpendicular to each other.

[0015] Telescopic sub-rod 2 and telescopic sub-rod 3 are the same rod, and the central support rod is the central axis rod of the two; retractable sub-rod 6 and telescopic sub-rod 7 are the same rod, and the central support rod is the central axis rod of the two.

[0016] The central support rod, telescopic sub-rod one, telescopic sub-rod two, telescopic sub-rod three, telescopic sub-rod four, telescopic sub-rod five, telescopic sub-rod six, telescopic sub-rod seven and telescopic sub-rod eight are all telescopic insulating rods.

[0017] The outgoing end of connecting wire one is built into spherical fastener one, and the incoming end of connecting wire two is built into spherical fastener two; the outgoing end of connecting wire three is built into spherical fastener three, and the incoming end of connecting wire four is built into spherical fastener four; the outgoing end of connecting wire six is ​​built into spherical fastener six, and the incoming end of connecting wire five is built into spherical fastener five; the outgoing end of connecting wire eight is built into spherical fastener eight, and the incoming end of connecting wire seven is built into spherical fastener seven.

[0018] A geoelectric model evaluation method using the above system comprises the following steps:

[0019] Step 1: Build a geoelectric model test platform based on the grounding system of distributed photovoltaic power stations;

[0020] Step 2: Measure the apparent electrical parameters of the ground around the distributed photovoltaic power station:

[0021] The distance between the spherical fastener 1 and the spherical fastener 2 and the distance between the spherical fastener 3 and the spherical fastener 4 are adjusted to A, and the spherical fastener 3 and the spherical fastener 4 are moved along the measuring line, and the distance A is kept unchanged during measurement; the distance between the center line of the spherical fastener 1 and the spherical fastener 2 and the center line of the spherical fastener 3 and the spherical fastener 4 is B; the distance between the spherical fastener 8 and the spherical fastener 7 and the distance between the spherical fastener 6 and the spherical fastener 5 are adjusted to C, and the spherical fastener 6 and the spherical fastener 5 are moved along the measuring line, and the distance C is kept unchanged during measurement, and C is set equal to A; the distance between the center line of the spherical fastener 8 and the spherical fastener 7 and the center line of the spherical fastener 6 and the spherical fastener 5 is D; the metal probe 1, the metal probe 2, the metal probe 3, the metal probe 4, the metal probe 5, the metal probe 6, the metal probe 7, and the metal probe 8 are all reliably grounded, and the apparent electrical parameters of the earth around the distributed photovoltaic power station at different positions are measured;

[0022] The third step is to evaluate the geoelectric model of the distributed photovoltaic power station grounding system and obtain the core evaluation factor K of the distributed photovoltaic power station geoelectric model:

[0023]

[0024] Where n is the total number of tests with different metal probe spacings, and are the currents applied to the probe electrode by the first and second voltage stabilized power supply generators for the jth time, and are the probe electrode potential differences recorded by the high-impedance voltage recording device 1 and the high-impedance voltage recording device 2 for the jth time respectively;

[0025] When K∈[0.9,1.1], it indicates that the geological layered distribution in the area of ​​the distributed photovoltaic power station group is close to horizontal. The quantitative estimation values ​​of the geoelectric model of each layer of the distributed photovoltaic power station grounding system are obtained through the heuristic search mechanism, including the quantitative estimation values ​​of the earth resistivity and the horizontal layered distribution of the earth depth in the area where the distributed photovoltaic power station grounding system is located;

[0026] when When the lateral changes of geological stratification may have occurred in the area of ​​the distributed photovoltaic power station group, it is necessary to perform quantitative calculations based on the boundary conditions of the profile structure of the lateral changes of the geological stratification, obtain the lateral changes of the geological stratification, and reasonably arrange the grounding system design of the distributed photovoltaic power station.

[0027] The estimation method provided by the present invention can effectively model and evaluate the geoelectric model under the influence of distributed resource space, and provide model and data support for improving the accurate design of distributed resource grounding system.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1) The present invention proposes a high-precision arrangement structure considering the arrangement of two separate poles, which is universally applicable to the geoelectric model test of the earth where the grounding system is located;

[0030] 2) The experimental platform constructed by the present invention can take into account the spatial characteristics of special distributed resources, and is portable, safe and reliable;

[0031] 3) The evaluation method of the present invention can obtain the core evaluation factors of the geoelectric model for the grounding system of a distributed photovoltaic power station, and can accurately and reliably evaluate the structure of the geoelectric model. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the overall structure of a geoelectric model test platform based on a distributed photovoltaic power station grounding system when the present invention is used; DETAILED DESCRIPTION

[0033] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0034] like Figure 1As shown, a distributed photovoltaic field grounding system includes four distributed photovoltaic sub-stations, and a central support pole 5 is arranged in the middle area of ​​the four distributed photovoltaic sub-stations.

[0035] The four distributed photovoltaic sub-stations are respectively a distributed photovoltaic sub-station 1 1, a distributed photovoltaic sub-station 2 2, a distributed photovoltaic sub-station 3 3 and a distributed photovoltaic sub-station 4 4, and a central support pole 5 is located in the middle area of ​​the four.

[0036] The central support rod 5 is respectively connected to the telescopic sub-rod 2 8, the telescopic sub-rod 3 9, the telescopic sub-rod 6 13 and the telescopic sub-rod 7 14, and the connection relationships are as follows:

[0037] The telescopic sub-rod 28 is connected to the telescopic sub-rod 17 through a spherical fastener 25, and the other end of the telescopic sub-rod 17 is provided with a spherical fastener 24; the metal probe 217 is connected to the spherical fastener 25 through a push pin buckle 23, and the metal probe 16 is connected to the spherical fastener 24 through a push pin buckle 32.

[0038] The telescopic sub-rod three 9 is connected to the telescopic sub-rod four 10 through a spherical fastener three 26, and the other end of the telescopic sub-rod four 10 is provided with a spherical fastener four 27; a metal probe three 18 is connected to the spherical fastener three 26 through a push pin buckle three 34, and a metal probe four 19 is connected to the spherical fastener four 27 through a push pin buckle four 35.

[0039] The telescopic sub-rod 6 13 is connected to the telescopic sub-rod 5 12 via a spherical fastener 6 29, and a spherical fastener 5 28 is provided at the other end of the telescopic sub-rod 5 12; a metal probe 6 21 is connected to the spherical fastener 6 29 via a push pin buckle 6 37, and a metal probe 5 20 is connected to the spherical fastener 5 28 via a push pin buckle 5 36.

[0040] The telescopic sub-rod 7 14 is connected to the telescopic sub-rod 8 15 via a spherical fastener 7 30, and a spherical fastener 8 31 is provided at the other end of the telescopic sub-rod 8 15; a metal probe 7 22 is connected to the spherical fastener 7 30 via a push pin buckle 7 38, and a metal probe 23 is connected to the spherical fastener 8 31 via a push pin buckle 8 39.

[0041] It should be noted that the above-mentioned central support rod 5, push pin buckle 1 32, push pin buckle 2 33, push pin buckle 3 34, push pin buckle 4 35, push pin buckle 5 36, push pin buckle 6 37, push pin buckle 7 38 and push pin buckle 8 39 are all perpendicular to the earth.

[0042] Telescopic sub-rod one 7, telescopic sub-rod two 8, telescopic sub-rod three 9 and telescopic sub-rod four 10 are arranged on the same line; telescopic sub-rod five 12, telescopic sub-rod six 13, telescopic sub-rod seven 14 and telescopic sub-rod eight 15 are arranged on the same line; and telescopic sub-rod one 7, telescopic sub-rod two 8, telescopic sub-rod three 9, telescopic sub-rod four 10, telescopic sub-rod five 12, telescopic sub-rod six 13, telescopic sub-rod seven 14 and telescopic sub-rod eight 15 are located in the same plane.

[0043] Furthermore, the second telescopic sub-rod 8 and the sixth telescopic sub-rod 13 are perpendicular to each other; the third telescopic sub-rod 9 and the seventh telescopic sub-rod 14 are perpendicular to each other.

[0044] Preferably, the telescopic sub-rod 2 8 and the telescopic sub-rod 3 9 are the same rod, and the central support rod 5 can be the central axis rod of the two. However, the telescopic sub-rod 6 13 and the telescopic sub-rod 7 14 are the same rod, and the central support rod 5 can be the central axis rod of the two.

[0045] Furthermore, the central support rod 5, telescopic sub-rod 1 7, telescopic sub-rod 2 8, telescopic sub-rod 3 9, telescopic sub-rod 4 10, telescopic sub-rod 5 12, telescopic sub-rod 6 13, telescopic sub-rod 7 14 and telescopic sub-rod 8 15 are all telescopic insulating rods.

[0046] Preferably, the top of the push pin buckle 32 is connected to the bottom of the spherical fastener 24, the metal probe 16 is connected to the bottom of the push pin buckle 32, the metal probe 16 can move up and down in the push pin buckle 32, and the position of the metal probe 16 is fixed by the buckle of the push pin buckle 32; the top of the push pin buckle 2 33 is connected to the bottom of the spherical fastener 25, the metal probe 2 17 is connected to the bottom of the push pin buckle 2 33, the metal probe 2 17 can move up and down in the push pin buckle 2 33, and the position of the metal probe 2 17 is fixed by the buckle of the push pin buckle 2 33. The top of the push pin buckle 34 is connected to the bottom of the spherical fastener 326, the metal probe 318 is connected to the bottom of the push pin buckle 34, the metal probe 318 can move up and down in the push pin buckle 34, and the position of the metal probe 318 is fixed by the buckle of the push pin buckle 34; the top of the push pin buckle 435 is connected to the bottom of the spherical fastener 427, the metal probe 419 is connected to the bottom of the push pin buckle 435, the metal probe 419 can move up and down in the push pin buckle 435, and the position of the metal probe 419 is fixed by the buckle of the push pin buckle 435 The top of the push pin buckle 36 is connected to the bottom of the spherical fastener 28, the metal probe 20 is connected to the bottom of the push pin buckle 36, the metal probe 20 can move up and down in the push pin buckle 36, and the position of the metal probe 20 is fixed by the buckle of the push pin buckle 36; the top of the push pin buckle 37 is connected to the bottom of the spherical fastener 29, the metal probe 21 is connected to the bottom of the push pin buckle 37, the metal probe 21 can move up and down in the push pin buckle 37, and the position of the metal probe 21 is fixed by the buckle of the push pin buckle 37 ; The top of the push pin buckle 738 is connected to the bottom of the spherical fastener 730, and the metal probe 722 is connected to the bottom of the push pin buckle 738. The metal probe 722 can move up and down in the push pin buckle 738, and the position of the metal probe 22 is fixed by the buckle of the push pin buckle 738; the top of the push pin buckle 839 is connected to the bottom of the spherical fastener 831, and the metal probe 823 is connected to the bottom of the push pin buckle 839. The metal probe 823 can move up and down in the push pin buckle 839; the position of the metal probe 23 is fixed by the buckle of the push pin buckle 839.

[0047] The metal probe 16 is electrically connected to the voltage-stabilized power supply generator 1 48 via the connection line 1 40, and the metal probe 2 17 is electrically connected to the voltage-stabilized power supply generator 1 48 via the connection line 2 41. Preferably, the outgoing end of the connection line 1 40 is built into the spherical fastener 1 24, and the incoming end of the connection line 2 41 is built into the spherical fastener 25.

[0048] The metal probe 3 18 is electrically connected to the high-resistance voltage recording device 1 49 via the connection line 3 42, and the metal probe 4 19 is electrically connected to the high-resistance voltage recording device 1 49 via the connection line 4 43. Preferably, the outgoing end of the connection line 3 42 is built into the spherical fastener 3 26, and the incoming end of the connection line 4 43 is built into the spherical fastener 4 27.

[0049] The metal probe 5 20 is electrically connected to the high-resistance voltage recording device 2 50 via the connection line 5 44, and the metal probe 6 21 is electrically connected to the high-resistance voltage recording device 2 50 via the connection line 6 45. Preferably, the outgoing end of the connection line 6 45 is built into the spherical fastener 6 29, and the incoming end of the connection line 5 44 is built into the spherical fastener 5 28.

[0050] The metal probe 7 22 is electrically connected to the voltage-stabilized power supply generating device 2 51 via the connecting wire 7 46, and the metal probe 8 23 is electrically connected to the voltage-stabilized power supply generating device 2 51 via the connecting wire 8 47. Preferably, the outgoing end of the connecting wire 8 47 is built into the spherical fastener 8 31, and the incoming end of the connecting wire 7 46 is built into the spherical fastener 7 30.

[0051] A geoelectric model evaluation method based on a distributed photovoltaic field grounding system comprises the following steps:

[0052] Step 1: Build a geoelectric model test platform based on the grounding system of distributed photovoltaic power stations;

[0053] Step 2: Measure the apparent electrical parameters of the ground around the distributed photovoltaic power station:

[0054] The distance between the spherical fastener 1 24 and the spherical fastener 25 and the distance between the spherical fastener 3 26 and the spherical fastener 4 27 are adjusted to A, and the spherical fastener 3 26 and the spherical fastener 4 27 are moved along the measuring line, and the distance A is kept unchanged during measurement; the distance between the center line of the spherical fastener 1 24 and the spherical fastener 25 and the center line of the spherical fastener 3 26 and the spherical fastener 4 27 is B; the distance between the spherical fastener 8 31 and the spherical fastener 7 30 and the distance between the spherical fastener 6 29 and the spherical fastener 5 28 are adjusted to C, and The spherical fastener 6 29 and the spherical fastener 5 28 move along the measuring line, and the distance C is kept unchanged during measurement, and C is set equal to A; the distance between the center line of the spherical fastener 8 31 and the spherical fastener 7 30 and the center line of the spherical fastener 6 29 and the spherical fastener 5 28 is D; the metal probe 1 16, the metal probe 2 17, the metal probe 3 18, the metal probe 4 19, the metal probe 5 20, the metal probe 6 21, the metal probe 7 22, and the metal probe 8 23 are all reliably grounded, and the apparent electrical parameters of the earth around the distributed photovoltaic power station at different positions are measured;

[0055] Step 3: Evaluate the geoelectric model of the distributed photovoltaic power station grounding system and obtain the core evaluation factor K of the distributed photovoltaic power station geoelectric model:

[0056]

[0057] Where n is the total number of tests with different metal probe spacings, and are the currents applied to the probe electrode by the first stabilized power supply generating device 48 and the second stabilized power supply generating device 51 for the jth time, respectively. and They are the probe electrode potential differences recorded by the high impedance voltage recording device 1 49 and the high impedance voltage recording device 2 50 for the jth time.

[0058] When K∈[0.9,1.1], it indicates that the geological layered distribution in the area of ​​the distributed photovoltaic power station group is close to horizontal. The quantitative estimation values ​​of the geoelectric model of each layer of the distributed photovoltaic power station grounding system are obtained through the heuristic search mechanism, including the quantitative estimation values ​​of the earth resistivity and the horizontal layered distribution of the earth depth in the area where the distributed photovoltaic power station grounding system is located;

[0059] when When the lateral changes of geological stratification may have occurred in the area of ​​the distributed photovoltaic power station group, it is necessary to perform quantitative calculations based on the boundary conditions of the profile structure of the lateral changes of the geological stratification, obtain the lateral changes of the geological stratification, and reasonably arrange the grounding system design of the distributed photovoltaic power station.

[0060] It should be noted that the calculation of the quantitative estimation value of the earth resistivity and the horizontal layered distribution of the earth depth here is the existing technology; and the calculation of the lateral change estimation function of the geological layer is also the existing technology, which will not be repeated here.

Claims

1. A grounding system based on a distributed photovoltaic field, characterized in that: It includes a distributed photovoltaic sub-station 1 (1), a distributed photovoltaic sub-station 2 (2), a distributed photovoltaic sub-station 3 (3) and a distributed photovoltaic sub-station 4 (4), and a central support pole (5) is located in the middle area of ​​the four; The central support rod (5) is respectively connected to the telescopic sub-rod 2 (8), the telescopic sub-rod 3 (9), the telescopic sub-rod 6 (13) and the telescopic sub-rod 7 (14), and the connection relationships are as follows: The telescopic sub-rod 2 (8) is connected to the telescopic sub-rod 1 (7) via the spherical fastener 2 (25), and the other end of the telescopic sub-rod 1 (7) is provided with a spherical fastener 1 (24); the spherical fastener 2 (25) is connected to the metal probe 2 (17) via the push pin buckle 2 (33), and the spherical fastener 1 (24) is connected to the metal probe 1 (16) via the push pin buckle 1 (32); The telescopic sub-rod 3 (9) is connected to the telescopic sub-rod 4 (10) via a spherical fastener 3 (26), and the other end of the telescopic sub-rod 4 (10) is provided with a spherical fastener 4 (27); a metal probe 3 (18) is connected to the spherical fastener 3 (26) via a push pin buckle 3 (34), and a metal probe 4 (19) is connected to the spherical fastener 4 (27) via a push pin buckle 4 (35); The telescopic sub-rod 6 (13) is connected to the telescopic sub-rod 5 (12) through a spherical fastener 6 (29), and the other end of the telescopic sub-rod 5 (12) is provided with a spherical fastener 5 (28); a metal probe 6 (21) is connected to the spherical fastener 6 (29) through a push pin buckle 6 (37), and a metal probe 5 (20) is connected to the spherical fastener 5 (28) through a push pin buckle 5 (36); The telescopic sub-rod 7 (14) is connected to the telescopic sub-rod 8 (15) through a spherical fastener 7 (30), and the other end of the telescopic sub-rod 8 (15) is provided with a spherical fastener 8 (31); a metal probe 7 (22) is connected to the spherical fastener 7 (30) through a push pin buckle 7 (38), and a metal probe 8 (23) is connected to the spherical fastener 8 (31) through a push pin buckle 8 (39); The central support rod (5), push pin buckle 1 (32), push pin buckle 2 (33), push pin buckle 3 (34), push pin buckle 4 (35), push pin buckle 5 (36), push pin buckle 6 (37), push pin buckle 7 (38) and push pin buckle 8 (39) are all perpendicular to the earth; The telescopic sub-rod 1 (7), the telescopic sub-rod 2 (8), the telescopic sub-rod 3 (9) and the telescopic sub-rod 4 (10) are arranged on the same line; the telescopic sub-rod 5 (12), the telescopic sub-rod 6 (13), the telescopic sub-rod 7 (14) and the telescopic sub-rod 8 (15) are arranged on the same line; and the telescopic sub-rod 1 (7), the telescopic sub-rod 2 (8), the telescopic sub-rod 3 (9), the telescopic sub-rod 4 (10), the telescopic sub-rod 5 (12), the telescopic sub-rod 6 (13), the telescopic sub-rod 7 (14) and the telescopic sub-rod 8 (15) are located on the same plane; The metal probe 1 (16) is electrically connected to the voltage-stabilized power supply generating device 1 (48) through the connecting line 1 (40), and the metal probe 2 (17) is electrically connected to the voltage-stabilized power supply generating device 1 (48) through the connecting line 2 (41); the metal probe 3 (18) is electrically connected to the high-resistance voltage recording device 1 (49) through the connecting line 3 (42), and the metal probe 4 (19) is electrically connected to the high-resistance voltage recording device 1 (49) through the connecting line 4 (43); the metal probe 5 (20) is electrically connected to the high-resistance voltage recording device 2 (50) through the connecting line 5 (44), and the metal probe 6 (21) is electrically connected to the high-resistance voltage recording device 2 (50) through the connecting line 6 (45); the metal probe 7 (22) is electrically connected to the voltage-stabilized power supply generating device 2 (51) through the connecting line 7 (46), and the metal probe 8 (23) is electrically connected to the voltage-stabilized power supply generating device 2 (51) through the connecting line 8 (47).

2. A distributed photovoltaic field grounding system according to claim 1, characterized in that: The second telescopic sub-rod (8) and the sixth telescopic sub-rod (13) are perpendicular to each other; the third telescopic sub-rod (9) and the seventh telescopic sub-rod (14) are perpendicular to each other.

3. A distributed photovoltaic field grounding system according to claim 1, characterized in that: The telescopic sub-rod 2 (8) and the telescopic sub-rod 3 (9) are the same rod, and the central support rod (5) is the central axis rod of the two; the retractable sub-rod 6 (13) and the telescopic sub-rod 7 (14) are the same rod, and the central support rod (5) is the central axis rod of the two.

4. The distributed photovoltaic field grounding system according to claim 1 is characterized in that: The central support rod (5), telescopic sub-rod one (7), telescopic sub-rod two (8), telescopic sub-rod three (9), telescopic sub-rod four (10), telescopic sub-rod five (12), telescopic sub-rod six (13), telescopic sub-rod seven (14) and telescopic sub-rod eight (15) are all telescopic insulating rods.

5. The distributed photovoltaic field grounding system according to claim 1 is characterized in that: The outgoing end of the connecting wire one (40) is built into the spherical fastener one (24), and the incoming end of the connecting wire two (41) is built into the spherical fastener two (25); the outgoing end of the connecting wire three (42) is built into the spherical fastener three (26), and the incoming end of the connecting wire four (43) is built into the spherical fastener four (27); the outgoing end of the connecting wire six (45) is built into the spherical fastener six (29), and the incoming end of the connecting wire five (44) is built into the spherical fastener five (28); the outgoing end of the connecting wire eight (47) is built into the spherical fastener eight (31), and the incoming end of the connecting wire seven (46) is built into the spherical fastener seven (30).

6. A method for evaluating a geoelectric model using any system of claims 1-5, characterized in that: The steps include: Step 1: Build a geoelectric model test platform based on the grounding system of distributed photovoltaic power stations; Step 2: Measure the apparent electrical parameters of the ground around the distributed photovoltaic power station: The distance between the spherical fastener 1 (24) and the spherical fastener 2 (25) and the distance between the spherical fastener 3 (26) and the spherical fastener 4 (27) are adjusted to A, and the spherical fastener 3 (26) and the spherical fastener 4 (27) are moved along the measuring line, and the distance A is kept unchanged during measurement; the distance between the center line of the spherical fastener 1 (24) and the spherical fastener 2 (25) and the center line of the spherical fastener 3 (26) and the spherical fastener 4 (27) is B; the distance between the spherical fastener 8 (31) and the spherical fastener 7 (30) and the distance between the spherical fastener 6 (29) and the spherical fastener 5 (28) are adjusted to C, and The spherical fastener six (29) and the spherical fastener five (28) move along the measuring line, and the distance C is kept constant during measurement, and C is set equal to A; the distance between the center line of the spherical fastener eight (31) and the spherical fastener seven (30) and the center line of the spherical fastener six (29) and the spherical fastener five (28) is D; the metal probe one (16), the metal probe two (17), the metal probe three (18), the metal probe four (19), the metal probe five (20), the metal probe six (21), the metal probe seven (22), and the metal probe eight (23) are all reliably grounded, and the apparent electrical parameters of the earth around the distributed photovoltaic power station at different positions are measured; The third step is to evaluate the geoelectric model of the distributed photovoltaic power station grounding system and obtain the core evaluation factor K of the distributed photovoltaic power station geoelectric model: Where n is the total number of tests with different metal probe spacings, and are the currents applied to the probe electrode by the first stabilized power supply generating device (48) and the second stabilized power supply generating device (51) for the jth time, respectively, and are the probe electrode potential differences recorded by the high impedance voltage recording device 1 (49) and the high impedance voltage recording device 2 (50) for the jth time respectively; When K∈[0.9,1.1], it indicates that the geological layered distribution in the area of ​​the distributed photovoltaic power station group is close to horizontal. The quantitative estimation values ​​of the geoelectric model of each layer of the distributed photovoltaic power station grounding system are obtained through the heuristic search mechanism, including the quantitative estimation values ​​of the earth resistivity and the horizontal layered distribution of the earth depth in the area where the distributed photovoltaic power station grounding system is located; when When the lateral changes of geological stratification may have occurred in the area of ​​the distributed photovoltaic power station group, it is necessary to perform quantitative calculations based on the boundary conditions of the profile structure of the lateral changes of the geological stratification, obtain the lateral changes of the geological stratification, and reasonably arrange the grounding system design of the distributed photovoltaic power station.

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