Photovoltaic array arrangement method, device and equipment based on medium-voltage direct-hanging inverter

Abstract

The invention relates to the technical field of photovoltaic system optimization design, in particular to a photovoltaic array arrangement method, device and equipment based on a medium-voltage direct-hanging inverter, and the method comprises the steps: determining a shadow range of a photovoltaic array in preset time, and according to the shadow range, calculating a central point transverse distance of adjacent photovoltaic group strings in the photovoltaic array in the row direction and a central point longitudinal distance of adjacent photovoltaic group strings in the column direction, thereby generating an initial arrangement strategy of the photovoltaic array, and carrying out iterative optimization on the initial arrangement strategy of the photovoltaic array to obtain an optimal arrangement strategy of the photovoltaic array. And determining the optimal arrangement position of the medium-voltage direct-hanging inverter in the optimal arrangement strategy of the photovoltaic array based on the optimal arrangement constraint condition, so as to arrange the medium-voltage direct-hanging inverter according to the optimal arrangement position. Therefore, the problem that the wiring length and specification of the direct-current cable are affected due to the fact that a cable arrangement method in the prior art is high in calculation complexity, cannot meet the arrangement requirement of the medium-voltage direct-hanging inverter and does not integrate cable current-carrying capacity and voltage drop verification is solved.

Description

Technical Field

[0001] The present application relates to the technical field of photovoltaic system optimization design, and in particular to a photovoltaic array arrangement method, device and equipment based on a medium-voltage direct-mounted inverter. Background Art

[0002] Against the backdrop of "carbon neutrality" becoming a global proposition, the construction of large-scale new energy bases focusing on deserts, Gobi and wasteland areas is accelerating. Photovoltaic power generation technology, as one of the important roles in it, is undergoing increasingly rapid technological iteration. With the technological advancement of high-power power electronic devices and the continuous improvement of the penetration rate of high-frequency transformers in power systems, the medium-voltage direct-mounted photovoltaic inverter based on the cascade topology of modular multi-level converters has been widely studied and technically applied in the industry in recent years due to its high conversion efficiency, high power density and high redundancy.

[0003] In the related technologies, the traditional photovoltaic system architecture mainly involves three stages: "PV strings (DC) - PV inverter (DC / AC) - industrial frequency step-up transformer (AC / AC)". The design of the photovoltaic array mainly includes the layout of facilities and equipment such as photovoltaic strings, photovoltaic inverters, industrial frequency step-up transformers and cable paths. During the layout process, manual methods are mainly used, that is, the number of photovoltaic strings, longitude and latitude, photovoltaic array inclination, azimuth, array ratio and other conditions are considered to minimize the wiring length.

[0004] However, in order to avoid mutual shading of photovoltaic arrays, it is necessary to obtain the layout boundaries based on a large number of complex calculations and parameter iterations. Due to the many correlations between the parameters, the complexity of the calculation will be increased, and the layout efficiency will be reduced. In addition, the existing layout method cannot meet the layout requirements of medium-voltage direct-mounted photovoltaic inverters, and does not integrate cable current carrying capacity and voltage drop verification. It is impossible to distinguish and count cable models, which affects the wiring length and specifications of the DC cable, which needs to be solved urgently. Summary of the invention

[0005] The present application provides a photovoltaic array layout method, device and equipment based on a medium-voltage direct-mounted inverter to solve the problem that the cable layout method in the related art has high calculation complexity, cannot meet the layout requirements of the medium-voltage direct-mounted inverter, and does not integrate cable current carrying capacity and voltage drop verification, thereby affecting the wiring length and specifications of the DC cable.

[0006] The first aspect of the present application provides a photovoltaic array arrangement method based on a medium voltage direct-mounted inverter, the method comprising:

[0007] Determine the shadow range of the photovoltaic array at a preset time;

[0008] Calculating the horizontal distance between the center points of adjacent photovoltaic strings in the row direction and the vertical distance between the center points of adjacent photovoltaic strings in the column direction according to the shadow range, and generating an initial layout strategy for the photovoltaic array based on the horizontal distance between the center points and the vertical distance between the center points;

[0009] The initial layout strategy of the photovoltaic array is iteratively optimized to obtain the optimal layout strategy of the photovoltaic array, and the optimal layout position of the medium-voltage direct-mounted inverter in the optimal layout strategy of the photovoltaic array is determined based on the optimal layout constraint condition, so as to arrange the medium-voltage direct-mounted inverter according to the optimal layout position.

[0010] Optionally, in an embodiment of the present application, the determining the shadow range of the photovoltaic array at the preset time includes:

[0011] Obtaining the longitude and latitude information of the current location of the photovoltaic array;

[0012] Obtaining the solar hour angle of the photovoltaic array according to the longitude information of the photovoltaic array, and obtaining the solar declination angle of the photovoltaic array according to the number of days in a year;

[0013] Obtaining the solar altitude angle and solar azimuth angle of the photovoltaic array at present according to the latitude information, the solar hour angle and the solar declination angle, and obtaining the shadow shielding coefficient of the photovoltaic array in the preset direction according to the solar altitude angle and the solar azimuth angle;

[0014] The shadow range of the photovoltaic array at the preset time is determined according to the shadow shielding coefficient of the photovoltaic array in the preset direction.

[0015] Optionally, in one embodiment of the present application, the calculating, according to the shadow range, a lateral distance between center points of adjacent photovoltaic strings in a row direction and a longitudinal distance between center points of adjacent photovoltaic strings in a column direction in the photovoltaic array includes:

[0016] Determine a first clear spacing between adjacent photovoltaic strings in a row direction based on the size of the photovoltaic strings, and obtain a lateral distance between center points of adjacent photovoltaic strings in a row direction according to the size of the photovoltaic strings and the first clear spacing;

[0017] Determining a projection length of the inclined surface of the photovoltaic string based on a first installation inclination angle of the photovoltaic string and a length of the inclined surface of the photovoltaic string;

[0018] Determining a second clear spacing in a column direction between adjacent photovoltaic strings based on a second installation inclination angle of the photovoltaic string, a length of an inclined surface of the photovoltaic string, and a shadow shielding coefficient in a preset direction;

[0019] The longitudinal distance between the center points of the adjacent photovoltaic strings in the column direction is obtained according to the projection length of the inclined surface of the photovoltaic strings and the second clear distance.

[0020] Optionally, in one embodiment of the present application, after iteratively optimizing the initial arrangement strategy of the photovoltaic array to obtain the optimal arrangement strategy of the photovoltaic array, the method further includes:

[0021] Determining the number of first photovoltaic strings in the row direction of the photovoltaic array and the number of second photovoltaic strings in the column direction of the photovoltaic array;

[0022] If the first number of photovoltaic strings and the second number of photovoltaic strings are both odd numbers, determining the optimal layout position of the medium voltage direct-mounted inverter according to the first number of photovoltaic strings and the second number of photovoltaic strings;

[0023] If the first number of photovoltaic strings is an even number, one column is added to the row direction where the first number of photovoltaic strings is located to obtain a new first number of photovoltaic strings in the row direction;

[0024] If the second number of photovoltaic strings is an even number, adding a row in the column direction where the second number of photovoltaic strings is located to obtain a new number of second photovoltaic strings in the column direction;

[0025] The optimal arrangement position of the medium voltage direct-mounted inverter is determined according to the new first number of photovoltaic strings in the row direction and the new second number of photovoltaic strings in the column direction.

[0026] Optionally, in one embodiment of the present application, after arranging the medium voltage direct-mounted inverter according to the optimal arrangement position, the method further includes:

[0027] The increase of the photovoltaic strings in the photovoltaic array is obtained, and based on the increase, the photovoltaic string farthest from the optimal arrangement position of the medium voltage direct-mounted inverter is deleted to obtain a final photovoltaic array based on the medium voltage direct-mounted inverter.

[0028] A second aspect of the present application provides a photovoltaic array arrangement device based on a medium voltage direct-mounted inverter, comprising:

[0029] A determination module, used to determine the shadow range of the photovoltaic array at a preset time;

[0030] A generation module, configured to calculate the lateral distance between the center points of adjacent photovoltaic strings in the row direction and the longitudinal distance between the center points of adjacent photovoltaic strings in the column direction according to the shadow range, and generate an initial layout strategy for the photovoltaic array based on the lateral distance between the center points and the longitudinal distance between the center points;

[0031] A layout module is used to iteratively optimize the initial layout strategy of the photovoltaic array to obtain the optimal layout strategy of the photovoltaic array, and determine the optimal layout position of the medium-voltage direct-mounted inverter in the optimal layout strategy of the photovoltaic array based on the optimal layout constraint condition, so as to arrange the medium-voltage direct-mounted inverter according to the optimal layout position.

[0032] Optionally, in one embodiment of the present application, the determining module includes:

[0033] A first acquisition unit is used to acquire the longitude information and latitude information of the photovoltaic array;

[0034] A second acquisition unit is used to obtain the solar hour angle of the photovoltaic array according to the longitude information of the photovoltaic array, and obtain the solar declination angle of the photovoltaic array according to the number of days in a year;

[0035] a third acquisition unit, configured to obtain the solar altitude angle and the solar azimuth angle of the photovoltaic array at present according to the latitude information, the solar hour angle and the solar declination angle, and obtain the shadow shielding coefficient of the photovoltaic array in the preset direction according to the solar altitude angle and the solar azimuth angle;

[0036] The first determining unit is used to determine the shadow range of the photovoltaic array at the preset time according to the shadow shielding coefficient of the photovoltaic array in the preset direction.

[0037] Optionally, in one embodiment of the present application, the generating module includes:

[0038] a fourth acquisition unit, configured to determine a first clear spacing between adjacent photovoltaic strings in a row direction based on the size of the photovoltaic strings, and obtain a lateral distance between center points of adjacent photovoltaic strings in a row direction according to the size of the photovoltaic strings and the first clear spacing;

[0039] A second determining unit, configured to determine a projection length of the inclined surface of the photovoltaic string based on a first installation inclination angle of the photovoltaic string and a length of the inclined surface of the photovoltaic string;

[0040] A third determining unit, configured to determine a second clear spacing in a column direction between adjacent photovoltaic strings based on a second installation inclination angle of the photovoltaic string, a length of an inclined surface of the photovoltaic string, and a shadow shielding coefficient in a preset direction;

[0041] A fifth acquisition unit is used to obtain a longitudinal distance between center points of adjacent photovoltaic strings in a column direction according to the projection length of the inclined surface of the photovoltaic strings and the second clear spacing.

[0042] Optionally, in one embodiment of the present application, after iteratively optimizing the initial arrangement strategy of the photovoltaic array to obtain the optimal arrangement strategy of the photovoltaic array, the arrangement module further includes:

[0043] A determination unit, configured to determine the number of first photovoltaic strings in a row direction of the photovoltaic array and the number of second photovoltaic strings in a column direction of the photovoltaic array;

[0044] a fourth determining unit, configured to determine an optimal arrangement position of the medium voltage direct-mounted inverter according to the first number of photovoltaic strings and the second number of photovoltaic strings if both the first number of photovoltaic strings and the second number of photovoltaic strings are odd numbers;

[0045] a sixth obtaining unit, configured to, if the first number of photovoltaic strings is an even number, add one column to the row direction where the first number of photovoltaic strings is located, to obtain a new number of first photovoltaic strings in the row direction;

[0046] a seventh obtaining unit, configured to, if the second photovoltaic string number is an even number, add a row in the column direction where the second photovoltaic string number is located, to obtain a new second photovoltaic string number in the column direction;

[0047] The fifth determining unit is used to determine the optimal arrangement position of the medium voltage direct-mounted inverter according to the new first number of photovoltaic strings in the row direction and the new second number of photovoltaic strings in the column direction.

[0048] Optionally, in one embodiment of the present application, after arranging the medium voltage direct-mounted inverter according to the optimal arrangement position, the arrangement module further includes:

[0049] The adjustment unit is used to obtain the increase of the photovoltaic strings in the photovoltaic array, and based on the increase, delete the photovoltaic strings farthest from the optimal arrangement position of the medium voltage direct-mounted inverter to obtain a final photovoltaic array based on the medium voltage direct-mounted inverter.

[0050] The third aspect of the present application provides an electronic device, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the photovoltaic array arrangement method based on a medium voltage direct-mounted inverter as described in the above claims.

[0051] The fourth aspect of the present application provides a computer-readable storage medium having a computer program stored thereon, which is executed by a processor to implement the photovoltaic array arrangement method based on a medium voltage direct-mounted inverter as described in the above claims.

[0052] The fifth aspect of the present application provides a computer program product, including a computer program / instruction, which, when executed by a processor, implements the photovoltaic array arrangement method based on medium voltage direct-mounted inverters as described above.

[0053] Therefore, this application has at least the following beneficial effects:

[0054] (1) Based on the current longitude and latitude, number of connected photovoltaic strings, photovoltaic string installation inclination, string arrangement and other design boundaries, this application obtains the comprehensive optimal photovoltaic array design result to obtain the optimal layout position of the medium voltage direct-mounted inverter, which greatly simplifies the difficulty of optimizing the layout of the photovoltaic array and reduces the number of iterations of the optimization layout;

[0055] (2) This application combines medium-voltage direct-mounted inverters with photovoltaic system design, comprehensively considers the optimized layout of photovoltaic strings and medium-voltage direct-mounted inverters, simplifies the wiring length of DC cables, and minimizes the length of DC cables, providing a basis for the feasibility of using medium-voltage direct-mounted inverters in photovoltaic system design. At the same time, the automated design and layout method also improves engineering design efficiency.

[0056] (3) This application can be widely applied to various design requirements based on engineering practice, filling the technical gap. Under any given number of photovoltaic strings, photovoltaic string installation inclination angle and other conditions, an adaptive comprehensive optimal photovoltaic array layout can be obtained;

[0057] (4) This application is applicable to the use of medium-voltage direct-mounted photovoltaic inverters, that is, power electronic transformers, which can complete the conversion of AC and DC and voltage levels through a single device, namely "photovoltaic string (DC)-medium-voltage direct-mounted photovoltaic inverter (AC)". At the same time, a photovoltaic array is obtained by using a medium-voltage direct-mounted photovoltaic inverter. The photovoltaic array only uses DC cables to reduce energy conversion losses.

[0058] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] Figure 1 A flowchart of a photovoltaic array arrangement method based on a medium voltage direct-mounted inverter provided according to an embodiment of the present application;

[0060] Figure 2 This is a general flow chart of photovoltaic array design and layout based on medium voltage direct-mounted photovoltaic inverters according to one embodiment of the present application;

[0061] Figure 3 A schematic diagram of the lateral distance between the center points of a photovoltaic string according to an embodiment of the present application;

[0062] Figure 4 This is a projection view of an inclined surface of a photovoltaic string according to an embodiment of the present application;

[0063] Figure 5 A structural diagram of a photovoltaic system based on a medium voltage direct-mounted photovoltaic inverter according to an embodiment of the present application;

[0064] Figure 6 A block diagram of a photovoltaic array arrangement device based on a medium voltage direct-mounted inverter according to an embodiment of the present application;

[0065] Figure 7 It is a schematic diagram of the structure of an electronic device provided according to an embodiment of the present application. DETAILED DESCRIPTION

[0066] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0067] The following describes the photovoltaic array arrangement method, device and equipment based on the medium voltage direct-mounted inverter of the embodiment of the present application with reference to the accompanying drawings. In view of the fact that the cable arrangement method in the related art mentioned in the above background technology has high calculation complexity, cannot meet the arrangement requirements of the medium voltage direct-mounted inverter, and does not integrate the cable current carrying capacity and voltage drop verification, thereby affecting the wiring length and specification of the DC cable, the present application provides a photovoltaic array arrangement method, in which the shadow range of the photovoltaic array at a preset time is determined, and the horizontal distance between the center points of adjacent photovoltaic strings in the row direction and the vertical distance between the center points in the column direction in the photovoltaic array are calculated according to the shadow range, so as to generate the initial arrangement strategy of the photovoltaic array, iteratively optimize the initial arrangement strategy of the photovoltaic array, obtain the optimal arrangement strategy of the photovoltaic array, and determine the optimal arrangement position of the medium voltage direct-mounted inverter in the optimal arrangement strategy of the photovoltaic array based on the optimal arrangement constraint condition, so as to arrange the medium voltage direct-mounted inverter according to the optimal arrangement position. This solves the problem that the cable layout method in the related art has high calculation complexity, cannot meet the layout requirements of the medium-voltage direct-mounted inverter, and does not integrate cable current carrying capacity and voltage drop verification, thereby affecting the wiring length and specifications of the DC cable.

[0068] like Figure 1 Shown is a flow chart of a photovoltaic array arrangement method based on a medium voltage direct-mounted inverter according to an embodiment of the present application.

[0069] like Figure 1 As shown, the photovoltaic array arrangement method based on the medium voltage direct-mounted inverter includes the following steps:

[0070] In step S101, the shadow range of the photovoltaic array at a preset time is determined.

[0071] Optionally, in one embodiment of the present application, determining the shadow range of the photovoltaic array at a preset time includes: obtaining the current longitude information and latitude information of the photovoltaic array; obtaining the current solar hour angle of the photovoltaic array based on the current longitude information of the photovoltaic array, and obtaining the current solar declination angle of the photovoltaic array based on the number of days in the whole year; obtaining the current solar altitude angle and solar azimuth angle of the photovoltaic array based on the latitude information, the solar hour angle and the solar declination angle, and obtaining the shadow shielding coefficient of the photovoltaic array in a preset direction based on the solar altitude angle and the solar azimuth angle; determining the shadow range of the photovoltaic array at a preset time based on the shadow shielding coefficient of the photovoltaic array in the preset direction.

[0072] Among them, the preset time can be selected by technical personnel in this field according to the actual shadow shielding conditions throughout the year. In order to avoid shadow shielding in the photovoltaic array of the present application during the calculation process and ensure that the photovoltaic array can receive sufficient sunlight, the embodiment of the present application calculates the spacing of photovoltaic modules in the photovoltaic array to meet the requirement of a photovoltaic array without shadow shielding between 9:00 and 15:00 on the winter solstice.

[0073] Specifically, Figure 2 As shown, the embodiment of the present application first obtains the longitude information and latitude information of the current area where the photovoltaic array is located, and then performs shading calculation based on the longitude information and latitude information of the current area where the photovoltaic array is located, the arrangement of photovoltaic strings in the photovoltaic array and the installation inclination angle of the photovoltaic strings to clarify the shadow range.

[0074] Specifically, after obtaining the longitude information and latitude information of the current region where the photovoltaic array is located, the embodiment of the present application can first obtain the true solar time of the current region where the photovoltaic array is located based on the longitude information of the current region where the photovoltaic array is located, and obtain the solar hour angle of the current region where the photovoltaic array is located from the true solar time, and then obtain the solar declination angle of the current region where the photovoltaic array is located based on the number of days throughout the year (i.e., the winter solstice).

[0075] Among them, the true solar time of the current area where the photovoltaic array is located can be expressed as:

[0076] ST=T local -(λ-120°) / 15°

[0077] The solar hour angle of the current location of the photovoltaic array can be expressed as:

[0078] ω=15×(ST-12)

[0079] The solar declination angle of the photovoltaic array in the current area can be expressed as:

[0080]

[0081] Among them, ST is the true solar time of the current location of the photovoltaic array, T local is the time of the current area, λ is the longitude information of the current area, ω is the solar hour angle of the current area of ​​the photovoltaic array, δ is the solar declination angle of the current area, and n is the number of days in the whole year. For example, the winter solstice is the 355th day of the whole year.

[0082] Secondly, the solar altitude angle and solar azimuth angle of the photovoltaic array are obtained according to the latitude information of the current area where the photovoltaic array is located, the solar hour angle and the solar declination angle, and the shadow shielding coefficient of the photovoltaic array in the preset direction is obtained according to the arrangement of the photovoltaic strings, the installation inclination angle of the photovoltaic strings, the solar altitude angle and the solar azimuth angle. For example, the shadow shielding coefficient of the photovoltaic array in the north-south direction can be obtained according to the solar altitude angle and the solar azimuth angle, and then the unobstructed shadow range of the photovoltaic array between 9:00 and 15:00 on the winter solstice is determined according to the shadow shielding coefficient of the photovoltaic array in the north-south direction, wherein the photovoltaic string is generally composed of 26 photovoltaic modules connected in series, and the arrangement is generally 2 rows and 13 columns, and there is an installation inclination angle.

[0083] Among them, the current solar altitude angle of the photovoltaic array can be expressed as:

[0084]

[0085] The current solar azimuth angle of the photovoltaic array can be expressed as:

[0086] β=arcsin(cosδsinω / cosα)

[0087] The shadow shielding coefficient of the photovoltaic array in the north-south direction can be expressed as:

[0088]

[0089] In step S102, the horizontal distance between the center points of adjacent photovoltaic strings in the row direction and the vertical distance between the center points of adjacent photovoltaic strings in the column direction are calculated according to the shadow range, and the initial layout strategy of the photovoltaic array is generated based on the horizontal distance between the center points and the vertical distance between the center points.

[0090] Optionally, in one embodiment of the present application, the lateral distance between the center points of adjacent photovoltaic strings in the row direction and the longitudinal distance between the center points of adjacent photovoltaic strings in the column direction in the photovoltaic array are calculated according to the shadow range, including: determining a first clear spacing between adjacent photovoltaic strings in the row direction based on the size of the photovoltaic strings, and obtaining the lateral distance between the center points of adjacent photovoltaic strings in the row direction according to the size of the photovoltaic strings and the first clear spacing; determining the projection length of the inclined surface of the photovoltaic strings based on the first installation inclination angle of the photovoltaic strings and the length of the inclined surface of the photovoltaic strings; determining the second clear spacing between adjacent photovoltaic strings in the column direction based on the second installation inclination angle of the photovoltaic strings, the length of the inclined surface of the photovoltaic strings and the shadow shielding coefficient of a preset direction; and obtaining the longitudinal distance between the center points of adjacent photovoltaic strings in the column direction according to the projection length of the inclined surface of the photovoltaic strings and the second clear spacing.

[0091] Specifically, Figure 2 and Figure 3 As shown, after obtaining the shadow range of the photovoltaic array, the embodiment of the present application determines the first clear spacing between adjacent photovoltaic strings in the row direction based on the size of the photovoltaic strings, and obtains the lateral distance between the center points of adjacent photovoltaic strings in the row direction according to the size of the photovoltaic strings and the first clear spacing, wherein the size of the photovoltaic strings is the length of 13 photovoltaic modules + the installation spacing of 12 photovoltaic modules, that is, the lateral distance L between the center points of adjacent photovoltaic strings in the row direction array = length of 13 photovoltaic modules + installation spacing of 12 photovoltaic modules + first clear spacing (i.e. Figure 3 Δ L ), whose expression is:

[0092] L array =L module n L +(n L -1)×Δ a +Δ L

[0093] Among them, L array is the lateral distance between the center points of adjacent PV strings in the row direction, L module is the size of the photovoltaic module, n L The number of PV modules installed in the PV array series direction, Δ a The installation distance of photovoltaic modules, Δ L It is the first clear spacing in the direction of the PV array string.

[0094] Furthermore, if Figure 4 As shown, the embodiment of the present application is based on the first installation inclination angle cosθ (optimal installation inclination angle) of the photovoltaic string and the inclined surface length W of the photovoltaic string arrayThe projection length D1 of the inclined surface of the photovoltaic string can be determined, and then the vertical height H of the photovoltaic string can be determined based on the second installation inclination angle sinθ (optimal installation inclination angle) of the photovoltaic string and the length of the inclined surface of the photovoltaic string. The second clear spacing D2 between adjacent photovoltaic strings in the column direction, that is, the north-south clear spacing, can be determined based on the shadow shielding coefficient in the north-south direction. Finally, the longitudinal distance D between the center points of adjacent photovoltaic strings in the column direction is obtained according to the projection length of the inclined surface of the photovoltaic string and the second clear spacing. N-S .

[0095] Among them, the length of the inclined surface of the photovoltaic string in the column direction is W array It can be expressed as:

[0096] W array =W module n W +(n W -1)×Δ a

[0097] The projected length D1 of the inclined surface of the photovoltaic string can be expressed as:

[0098] D1=W array cosθ

[0099] The second clear distance D2 between adjacent photovoltaic strings in the column direction can be expressed as:

[0100] H=W array sinθ

[0101] D2=H·R N-S

[0102] The longitudinal distance D between the center points of adjacent photovoltaic strings in the column direction N-S It can be expressed as:

[0103] D N-S =D1+D2

[0104] Among them, W array is the length of the inclined surface of the adjacent photovoltaic strings in the column direction, D1 is the projection length of the inclined surface of the photovoltaic string, θ is the installation inclination angle of the photovoltaic string, W module is the size of the photovoltaic module in the row direction, n W is the number of PV modules installed in the PV array, Δ a is the installation spacing of photovoltaic modules, H is the vertical height of photovoltaic strings, D2 is the second clear spacing between adjacent photovoltaic strings in the column direction (i.e., the clear spacing in the north-south direction), R N-S is the shadow coefficient in the north-south direction, D N-S It is the longitudinal distance between the center points of adjacent PV strings in the column direction, that is, the distance between the front and rear rows in the north-south direction.

[0105] Therefore, the embodiment of the present application can perform a preliminary arrangement of the photovoltaic array according to the horizontal distance between the center points of adjacent photovoltaic strings in the row direction and the vertical distance between the center points in the column direction, and generate an initial arrangement strategy for the photovoltaic array, and its objective function can be expressed as:

[0106] f(x,y)=xy

[0107] Among them, x is the number of the first photovoltaic strings in the row direction of the photovoltaic array arrangement, y is the number of the second photovoltaic strings in the photovoltaic array direction, and xy is the maximum number of objects in the photovoltaic array arrangement.

[0108] In step S103, the initial layout strategy of the photovoltaic array is iteratively optimized to obtain the optimal layout strategy of the photovoltaic array, and the optimal layout position of the medium voltage direct-mounted inverter in the optimal layout strategy of the photovoltaic array is determined based on the optimal layout constraint condition, so as to arrange the medium voltage direct-mounted inverter according to the optimal layout position.

[0109] Optionally, in one embodiment of the present application, after iteratively optimizing the initial layout strategy of the photovoltaic array to obtain the optimal layout strategy of the photovoltaic array, it also includes: determining the first number of photovoltaic strings in the row direction of the photovoltaic array and the second number of photovoltaic strings in the column direction of the photovoltaic array; if the first number of photovoltaic strings and the second number of photovoltaic strings are both odd numbers, determining the optimal layout position of the medium voltage direct-mounted inverter according to the first number of photovoltaic strings and the second number of photovoltaic strings; if the first number of photovoltaic strings is an even number, adding one column in the row direction where the first number of photovoltaic strings is located to obtain a new first number of photovoltaic strings in the row direction; if the second number of photovoltaic strings is an even number, adding one row in the column direction where the second number of photovoltaic strings is located to obtain a new second number of photovoltaic strings in the column direction; determining the optimal layout position of the medium voltage direct-mounted inverter according to the new first number of photovoltaic strings in the row direction and the new second number of photovoltaic strings in the column direction.

[0110] Specifically, after the embodiment of the present application generates the initial layout strategy of the photovoltaic array, since the number of the first photovoltaic strings in the row direction of the photovoltaic array and the number of the second photovoltaic strings in the column direction are not integers, it is necessary to iteratively optimize the initial layout strategy of the photovoltaic array, that is, round up the number of the first photovoltaic strings in the row direction of the photovoltaic array and the number of the second photovoltaic strings in the column direction of the photovoltaic array to obtain the optimal layout strategy of the photovoltaic array, and then further determine the parity of the first photovoltaic strings in the row direction of the photovoltaic array and the second photovoltaic strings in the column direction of the photovoltaic array, so as to obtain the optimal layout strategy of the photovoltaic array based on the parity of the number of photovoltaic array strings.

[0111] Among them, the optimal arrangement and iterative update of the photovoltaic array can be obtained by solving the Lagrangian function, and the expression is as follows:

[0112]

[0113] Where x is the number of the first photovoltaic strings in the row direction of the photovoltaic array, y is the number of the second photovoltaic strings in the column direction of the photovoltaic array, N total is the sum of the number of PV strings and medium voltage direct-mounted inverters, D N-S is the distance between the front and rear rows of the photovoltaic string in the north-south direction, D2 is the net distance between the photovoltaic strings in the north-south direction, and L array is the lateral distance between the center points of adjacent PV strings in the row direction, Δ L is the first clear spacing in the PV group series direction, λ1 is the Lagrangian multiplier for the lower limit constraint of the total number of components, λ2 is the Lagrangian multiplier for the upper limit constraint of the total number of components, λ3 is the Lagrangian multiplier for the spacing constraint in the north-south direction, and λ4 is the Lagrangian multiplier for the first longitudinal clear spacing condition of the PV string.

[0114] Furthermore, the embodiment of the present application adopts the KKT (Karush-Kuhn-Tucker) condition (i.e., the optimal solution condition) to solve the optimization function f(x, y) = xy. The KKT condition is a very critical condition in optimization theory and is used to determine the potential optimal solution of an optimization problem. The KKT condition is particularly suitable for constrained optimization problems. The KKT condition must and meets the following conditions:

[0115] (1) The gradient condition must be met, and the expression is as follows:

[0116]

[0117] (2) The original constraint condition must be satisfied, and the expression is as follows:

[0118] N total ≤xy≤N total +x

[0119] D N-s y-(D2+L array )≤L array x-Δ L

[0120] L array x-Δ L ≤D N-s y+(L array -D2)

[0121] (3) It needs to satisfy dual feasibility, and the expression is as follows:

[0122] λ i ≥0 for all i

[0123] (4) The complementary slackness condition must be satisfied, and the expression is as follows:

[0124] λ1(N total -xy)=0

[0125] λ2(xy-(N total +x))=0

[0126] λ3(D N-s y-(D2+L array )-(L array x-Δ L ))=0

[0127] λ4(L array x-Δ L -(D N-s y+(L array -D2)))=0

[0128] Based on the optimal layout strategy of the photovoltaic array obtained above, it is also necessary to consider the parity of the first photovoltaic string number x in the row direction and the second photovoltaic string number y in the column direction of the photovoltaic array, reconstruct the photovoltaic array, and determine the optimal layout position of the medium-voltage direct-mounted inverter based on the optimal layout constraint condition (i.e., the constraint condition of the minimum total wiring length of the DC cable).

[0129] Specifically, the embodiment of the present application obtains the optimal layout strategy of the photovoltaic array, determines the first number of photovoltaic strings in the row direction of the photovoltaic array and the second number of photovoltaic strings in the column direction of the photovoltaic array. If the first number of photovoltaic strings and the second number of photovoltaic strings are both odd numbers, the optimal layout position of the medium-voltage direct-mounted inverter can be determined based on the first number of photovoltaic strings and the second number of photovoltaic strings, and based on the optimal layout constraint condition, that is, the most central position of the photovoltaic array; if the first number of photovoltaic strings is an even number, it is necessary to add one column in the row direction where the first number of photovoltaic strings is located to obtain a new first number of photovoltaic strings in the row direction; if the second number of photovoltaic strings is an even number, it is necessary to add one row in the column direction where the second number of photovoltaic strings is located to obtain a new second number of photovoltaic strings in the column direction, thereby adjusting the photovoltaic array according to the new first number of photovoltaic strings in the row direction and the new second number of photovoltaic strings in the column direction, and determining the optimal layout position of the medium-voltage direct-mounted inverter based on the optimal layout constraint condition, that is, the most central position of the photovoltaic array, at this time, the total wiring length of the DC cable is the smallest, wherein the expression of the photovoltaic array obtained by the above adjustment is as follows:

[0130]

[0131] Wherein, x is the number of first photovoltaic strings in the row direction of the photovoltaic array, and y is the number of second photovoltaic strings in the column direction.

[0132] The parity expression of PV strings is as follows:

[0133]

[0134] The photovoltaic array is adjusted based on the parity judgment of the first photovoltaic string number and the second photovoltaic string number, and the optimal layout position of the medium voltage direct-mounted inverter is determined based on the optimal layout constraint condition of minimizing the total wiring length of the DC cable, so as to arrange the medium voltage direct-mounted inverter according to the optimal layout position.

[0135] Optionally, in one embodiment of the present application, after arranging the medium voltage direct-mounted inverter according to the optimal layout position, it also includes: obtaining the increase in the photovoltaic strings in the photovoltaic array, and deleting the photovoltaic strings farthest from the optimal layout position of the medium voltage direct-mounted inverter based on the increase, so as to obtain the final photovoltaic array based on the medium voltage direct-mounted inverter.

[0136] Specifically, after obtaining the optimal layout position of the medium-voltage direct-mounted inverter, the embodiment of the present application determines the cable length from each photovoltaic string to the medium-voltage direct-mounted inverter, which will affect the selection of cable specifications. Therefore, it is necessary to first perform cable laying path length statistics and voltage drop verification for each photovoltaic string to determine the DC cable specification selection. DC cables with different cross-sectional specifications (such as 4mm 2 , 6mm 2 The maximum allowable access length can be calculated based on the allowable voltage drop, as shown below:

[0137]

[0138] Where, L is the maximum length of the cable; I mpp is the peak power current of the component, V mpp is the peak power voltage of the module, A1 is the number of PV modules in the series direction of the PV group, A2 is the number of PV modules in the series direction of the PV group, S is the wire cross section, T is the wire operating temperature, Δ U is the maximum allowable voltage drop, ρ is the resistivity of the copper cable at 20°C, and a is the temperature coefficient of resistance.

[0139] Then, if Figure 5 As shown, the increase in the number of photovoltaic strings in the photovoltaic array obtained after the above iterative optimization is obtained, and the photovoltaic strings farthest from the optimal layout position of the medium-voltage direct-mounted inverter are deleted based on the increase, that is, the number of deletions is xy-N total PV strings are selected to keep the results matching the demand, thus obtaining the final PV array based on the medium-voltage direct-mounted inverter and generating the final PV array layout diagram. Based on the optimal layout position of the obtained medium-voltage direct-mounted inverter, the length I of the DC cable connected to each PV string is calculated, thereby obtaining the statistical results of the DC cable engineering quantity. The statistical expression of the cable engineering quantity is as follows:

[0140]

[0141] Among them, I(m,n) is the length of the DC cable connecting each photovoltaic string to the medium-voltage direct-mounted photovoltaic inverter.

[0142] Therefore, it can be seen from the above embodiments that the layout position of the medium voltage direct-mounted inverter has an important impact on the overall performance and economy of the photovoltaic matrix. Reasonable inverter location planning can reduce cable losses, improve system efficiency, simplify maintenance processes, and help reduce overall costs. Therefore, when designing a large-scale photovoltaic power station, the above factors need to be comprehensively considered to achieve the best system layout and performance.

[0143] According to the photovoltaic array arrangement method based on medium-voltage direct-mounted inverters proposed in the embodiment of the present application, the shadow range of the photovoltaic array at a preset time is determined, and the horizontal distance between the center points of adjacent photovoltaic strings in the row direction and the vertical distance between the center points in the column direction in the photovoltaic array are calculated based on the shadow range, thereby generating an initial arrangement strategy for the photovoltaic array, iteratively optimizing the initial arrangement strategy of the photovoltaic array, obtaining the optimal arrangement strategy for the photovoltaic array, and determining the optimal arrangement position of the medium-voltage direct-mounted inverter in the optimal arrangement strategy of the photovoltaic array based on the optimal arrangement constraint conditions, so as to arrange the medium-voltage direct-mounted inverter according to the optimal arrangement position. Thus, the problem that the cable arrangement method in the related art has high calculation complexity, cannot meet the arrangement requirements of the medium-voltage direct-mounted inverter, and does not integrate the cable current carrying capacity and voltage drop verification, thereby affecting the wiring length and specifications of the DC cable is solved.

[0144] Next, a photovoltaic array arrangement device based on a medium voltage direct-mounted inverter proposed in accordance with an embodiment of the present application will be described with reference to the accompanying drawings.

[0145] Figure 6 It is a block diagram of a photovoltaic array arrangement device based on a medium voltage direct-mounted inverter according to an embodiment of the present application.

[0146] like Figure 6 As shown, the photovoltaic array arrangement device 10 based on medium voltage direct-mounted inverters includes: a determination module 100 , a generation module 200 and an arrangement module 300 .

[0147] Wherein, the determination module 100 is used to determine the shadow range of the photovoltaic array at a preset time;

[0148] A generation module 200 is used to calculate the horizontal distance between the center points of adjacent photovoltaic strings in the row direction and the vertical distance between the center points of adjacent photovoltaic strings in the column direction in the photovoltaic array according to the shadow range, and generate an initial layout strategy of the photovoltaic array based on the horizontal distance between the center points and the vertical distance between the center points;

[0149] The arrangement module 300 is used to iteratively optimize the initial arrangement strategy of the photovoltaic array to obtain the optimal arrangement strategy of the photovoltaic array, and determine the optimal arrangement position of the medium-voltage direct-mounted inverter in the optimal arrangement strategy of the photovoltaic array based on the optimal arrangement constraint condition, so as to arrange the medium-voltage direct-mounted inverter according to the optimal arrangement position.

[0150] Optionally, in one embodiment of the present application, the determination module 100 includes:

[0151] A first acquisition unit is used to acquire the longitude information and latitude information of the photovoltaic array;

[0152] The second acquisition unit is used to obtain the solar hour angle of the photovoltaic array according to the longitude information of the photovoltaic array, and obtain the solar declination angle of the photovoltaic array according to the number of days in a year;

[0153] A third acquisition unit is used to obtain the solar altitude angle and solar azimuth angle of the photovoltaic array according to the latitude information, the solar hour angle and the solar declination angle, and obtain the shadow shielding coefficient of the photovoltaic array in a preset direction according to the solar altitude angle and the solar azimuth angle;

[0154] The first determining unit is used to determine the shadow range of the photovoltaic array at a preset time according to the shadow shielding coefficient of the photovoltaic array in a preset direction.

[0155] Optionally, in one embodiment of the present application, the generating module 200 includes:

[0156] a fourth acquisition unit, configured to determine a first clear spacing between adjacent photovoltaic strings in a row direction based on the size of the photovoltaic strings, and obtain a lateral distance between center points of adjacent photovoltaic strings in a row direction according to the size of the photovoltaic strings and the first clear spacing;

[0157] A second determining unit is used to determine the projection length of the inclined surface of the photovoltaic string based on the first installation inclination angle of the photovoltaic string and the length of the inclined surface of the photovoltaic string;

[0158] A third determining unit is used to determine a second clear spacing in a column direction between adjacent photovoltaic strings based on a second installation inclination angle of the photovoltaic string, a length of an inclined surface of the photovoltaic string, and a shadow shielding coefficient in a preset direction;

[0159] A fifth acquisition unit is used to obtain a longitudinal distance between center points of adjacent photovoltaic strings in a column direction according to the projection length of the inclined surface of the photovoltaic strings and the second clear spacing.

[0160] Optionally, in one embodiment of the present application, after the initial arrangement strategy of the photovoltaic array is iteratively optimized to obtain the optimal arrangement strategy of the photovoltaic array, the arrangement module 300 further includes:

[0161] A determination unit, used to determine the number of first photovoltaic strings in the row direction of the photovoltaic array and the number of second photovoltaic strings in the column direction of the photovoltaic array;

[0162] A fourth determining unit is configured to determine an optimal arrangement position of the medium voltage direct-mounted inverter according to the first number of photovoltaic strings and the second number of photovoltaic strings if both the first number of photovoltaic strings and the second number of photovoltaic strings are odd numbers;

[0163] a sixth acquisition unit, configured to, if the first photovoltaic string number is an even number, add one column to the row direction where the first photovoltaic string number is located, to obtain a new first photovoltaic string number in the row direction;

[0164] a seventh acquisition unit, configured to, if the second photovoltaic string number is an even number, add a row to the column direction where the second photovoltaic string number is located, to obtain a new second photovoltaic string number in the column direction;

[0165] The fifth determining unit is used to determine the optimal arrangement position of the medium voltage direct-mounted inverter according to the new first number of photovoltaic strings in the row direction and the new second number of photovoltaic strings in the column direction.

[0166] Optionally, in one embodiment of the present application, after arranging the medium voltage direct-mounted inverter according to the optimal arrangement position, the arrangement module 300 further includes:

[0167] The adjustment unit is used to obtain the increase of the photovoltaic strings in the photovoltaic array, and based on the increase, delete the photovoltaic strings farthest from the optimal arrangement position of the medium voltage direct-mounted inverter to obtain a final photovoltaic array based on the medium voltage direct-mounted inverter.

[0168] According to the photovoltaic array arrangement device based on medium-voltage direct-mounted inverters proposed in the embodiment of the present application, the shadow range of the photovoltaic array at a preset time is determined, and the horizontal distance between the center points of adjacent photovoltaic strings in the row direction and the vertical distance between the center points in the column direction in the photovoltaic array are calculated according to the shadow range, thereby generating an initial arrangement strategy for the photovoltaic array, iteratively optimizing the initial arrangement strategy of the photovoltaic array, obtaining the optimal arrangement strategy for the photovoltaic array, and determining the optimal arrangement position of the medium-voltage direct-mounted inverter in the optimal arrangement strategy of the photovoltaic array based on the optimal arrangement constraint conditions, so as to arrange the medium-voltage direct-mounted inverter according to the optimal arrangement position. Thus, the problem that the cable arrangement method in the related art has high calculation complexity, cannot meet the arrangement requirements of the medium-voltage direct-mounted inverter, and does not integrate the cable current carrying capacity and voltage drop verification, thereby affecting the wiring length and specifications of the DC cable is solved.

[0169] Figure 7 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application. The electronic device may include:

[0170] A memory 701 , a processor 702 , and a computer program stored in the memory 701 and executable on the processor 702 .

[0171] When the processor 702 executes the program, the photovoltaic array arrangement method based on the medium voltage direct-mounted inverter provided in the above embodiment is implemented.

[0172] Furthermore, the electronic device further comprises:

[0173] The communication interface 703 is used for communication between the memory 701 and the processor 702 .

[0174] The memory 701 is used to store computer programs that can be executed on the processor 702 .

[0175] The memory 701 may include a high-speed RAM memory, and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory.

[0176] If the memory 701, the processor 702 and the communication interface 703 are implemented independently, the communication interface 703, the memory 701 and the processor 702 can be connected to each other through a bus and communicate with each other. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 7 Only one thick line is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0177] Optionally, in a specific implementation, if the memory 701, the processor 702 and the communication interface 703 are integrated on a chip, the memory 701, the processor 702 and the communication interface 703 can communicate with each other through an internal interface.

[0178] The processor 702 may be a central processing unit (CPU), or an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present application.

[0179] An embodiment of the present application also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the above-mentioned photovoltaic array arrangement method based on medium-voltage direct-mounted inverters.

[0180] The embodiment of the present application also provides a computer program product, including a computer program / instruction, which, when executed by a processor, implements the photovoltaic array arrangement method based on medium voltage direct-mounted inverters as described above.

[0181] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or N embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0182] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0183] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or N executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0184] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purpose of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or N wirings (electronic devices), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically by optically scanning the paper or other medium and then editing, interpreting or otherwise processing in a suitable manner if necessary and then storing it in a computer memory.

[0185] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above embodiment, the N steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. If implemented by hardware, as in another embodiment, it can be implemented by any one or a combination of multiple of the following technologies known in the art: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0186] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0187] In addition, each functional unit in each embodiment of the present application may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0188] The storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, etc. Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application. A person of ordinary skill in the art may change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A photovoltaic array arrangement method based on medium voltage direct-mounted inverters, characterized in that: The following steps are involved: Determine the shadow range of the photovoltaic array at a preset time; Calculating the horizontal distance between the center points of adjacent photovoltaic strings in the row direction and the vertical distance between the center points of adjacent photovoltaic strings in the column direction according to the shadow range, and generating an initial layout strategy for the photovoltaic array based on the horizontal distance between the center points and the vertical distance between the center points; The initial layout strategy of the photovoltaic array is iteratively optimized to obtain the optimal layout strategy of the photovoltaic array, and the optimal layout position of the medium-voltage direct-mounted inverter in the optimal layout strategy of the photovoltaic array is determined based on the optimal layout constraint condition, so as to arrange the medium-voltage direct-mounted inverter according to the optimal layout position.

2. The method according to claim 1, characterized in that The determining the shadow range of the photovoltaic array at the preset time includes: Obtaining the longitude and latitude information of the current location of the photovoltaic array; Obtaining the solar hour angle of the photovoltaic array according to the longitude information of the photovoltaic array, and obtaining the solar declination angle of the photovoltaic array according to the number of days in a year; Obtaining the solar altitude angle and solar azimuth angle of the photovoltaic array at present according to the latitude information, the solar hour angle and the solar declination angle, and obtaining the shadow shielding coefficient of the photovoltaic array in the preset direction according to the solar altitude angle and the solar azimuth angle; The shadow range of the photovoltaic array at the preset time is determined according to the shadow shielding coefficient of the photovoltaic array in the preset direction.

3. The method according to claim 1, characterized in that The calculating, according to the shadow range, a lateral distance between center points of adjacent photovoltaic strings in the photovoltaic array in a row direction and a longitudinal distance between center points of adjacent photovoltaic strings in a column direction comprises: Determine a first clear spacing between adjacent photovoltaic strings in a row direction based on the size of the photovoltaic strings, and obtain a lateral distance between center points of adjacent photovoltaic strings in a row direction according to the size of the photovoltaic strings and the first clear spacing; Determining a projection length of the inclined surface of the photovoltaic string based on a first installation inclination angle of the photovoltaic string and a length of the inclined surface of the photovoltaic string; Determining a second clear spacing in a column direction between adjacent photovoltaic strings based on a second installation inclination angle of the photovoltaic string, a length of an inclined surface of the photovoltaic string, and a shadow shielding coefficient in a preset direction; The longitudinal distance between the center points of the adjacent photovoltaic strings in the column direction is obtained according to the projection length of the inclined surface of the photovoltaic strings and the second clear distance.

4. The method according to claim 1, characterized in that After iteratively optimizing the initial layout strategy of the photovoltaic array to obtain the optimal layout strategy of the photovoltaic array, the method further includes: Determining the number of first photovoltaic strings in the row direction of the photovoltaic array and the number of second photovoltaic strings in the column direction of the photovoltaic array; If the first number of photovoltaic strings and the second number of photovoltaic strings are both odd numbers, determining the optimal layout position of the medium voltage direct-mounted inverter according to the first number of photovoltaic strings and the second number of photovoltaic strings; If the first number of photovoltaic strings is an even number, one column is added to the row direction where the first number of photovoltaic strings is located to obtain a new first number of photovoltaic strings in the row direction; If the second number of photovoltaic strings is an even number, adding a row in the column direction where the second number of photovoltaic strings is located to obtain a new number of second photovoltaic strings in the column direction; The optimal arrangement position of the medium voltage direct-mounted inverter is determined according to the new first number of photovoltaic strings in the row direction and the new second number of photovoltaic strings in the column direction.

5. The method according to claim 1, characterized in that After arranging the medium voltage direct-mounted inverter according to the optimal arrangement position, the method further includes: The increase of the photovoltaic strings in the photovoltaic array is obtained, and based on the increase, the photovoltaic string farthest from the optimal arrangement position of the medium voltage direct-mounted inverter is deleted to obtain a final photovoltaic array based on the medium voltage direct-mounted inverter.

6. A photovoltaic array arrangement device based on a medium voltage direct-mounted inverter, characterized in that: include: A determination module, used to determine the shadow range of the photovoltaic array at a preset time; A generation module, configured to calculate the lateral distance between the center points of adjacent photovoltaic strings in the row direction and the longitudinal distance between the center points of adjacent photovoltaic strings in the column direction according to the shadow range, and generate an initial layout strategy for the photovoltaic array based on the lateral distance between the center points and the longitudinal distance between the center points; A layout module is used to iteratively optimize the initial layout strategy of the photovoltaic array to obtain the optimal layout strategy of the photovoltaic array, and determine the optimal layout position of the medium-voltage direct-mounted inverter in the optimal layout strategy of the photovoltaic array based on the optimal layout constraint condition, so as to arrange the medium-voltage direct-mounted inverter according to the optimal layout position.

7. The device according to claim 6, characterized in that The determining module comprises: A first acquisition unit is used to acquire the longitude information and latitude information of the photovoltaic array; A second acquisition unit is used to obtain the solar hour angle of the photovoltaic array according to the longitude information of the photovoltaic array, and obtain the solar declination angle of the photovoltaic array according to the number of days in a year; a third acquisition unit, configured to obtain the solar altitude angle and the solar azimuth angle of the photovoltaic array at present according to the latitude information, the solar hour angle and the solar declination angle, and obtain the shadow shielding coefficient of the photovoltaic array in the preset direction according to the solar altitude angle and the solar azimuth angle; The first determining unit is used to determine the shadow range of the photovoltaic array at the preset time according to the shadow shielding coefficient of the photovoltaic array in the preset direction.

8. An electronic device, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the photovoltaic array arrangement method based on a medium voltage direct-mounted inverter as described in any one of claims 1 to 5.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: The program is executed by a processor to implement the photovoltaic array arrangement method based on a medium voltage direct-mounted inverter as described in any one of claims 1 to 5.

10. A computer program product, comprising a computer program, characterized in that The computer program is executed to implement the photovoltaic array arrangement method based on medium voltage direct-mounted inverters as described in any one of claims 1 to 5.

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