Photovoltaic array arrangement method, device and storage medium

Abstract

The present invention provides a photovoltaic array arrangement method, device, and storage medium. The method includes: obtaining the regional total capacity and maximum capacity ratio of a photovoltaic power station, as well as the maximum capacity of a single box transformer; based on a first preset rule, determining an initial combination of box transformers within the photovoltaic power station according to the regional total capacity, maximum capacity ratio, and maximum capacity of the box transformer; optimizing the number of box transformers and the capacity of each box transformer in the initial combination of box transformers according to a second preset rule to determine an optimal box transformer combination, wherein the number of photovoltaic arrays in the photovoltaic power station is equal to the number of box transformers in the optimal box transformer combination; determining the number range of photovoltaic devices in each photovoltaic array according to the optimal box transformer combination, and determining the corresponding photovoltaic array capacity set according to each number range; and determining the reference capacity of each photovoltaic array according to the regional total capacity and each capacity set. By optimizing the photovoltaic array arrangement, the present invention can avoid the occurrence of photovoltaic array capacity imbalance and reduce equipment costs.

Description

Technical Field

[0001] The present invention relates to the field of photovoltaic power generation technology, and in particular to a photovoltaic array arrangement method, device and storage medium. Background Art

[0002] In the planning and design of photovoltaic power stations, different photovoltaic array arrangements have a significant impact on the construction cost of the photovoltaic power station. Therefore, how to design the optimal photovoltaic array arrangement scheme is of great significance to reducing the construction cost of the photovoltaic power station. Among them, optimizing the photovoltaic array arrangement method includes optimizing the number and capacity of the photovoltaic arrays.

[0003] Currently, simulation software is often used to optimize the capacity-to-use ratio of photovoltaic power plants to determine the layout of the photovoltaic arrays. The capacity-to-use ratio refers to the ratio of the installed capacity of a photovoltaic power plant to its rated capacity. The installed capacity refers to the sum of the nominal power of the photovoltaic modules installed in the plant, while the rated capacity refers to the sum of the rated active power of the photovoltaic equipment installed in the plant. However, determining the layout of the photovoltaic arrays by optimizing the capacity-to-use ratio only determines the sum of the capacity of the photovoltaic arrays in the plant. When the terrain in the area where the photovoltaic plant is located is complex, the photovoltaic array layout may not be suitable for actual site needs, resulting in some photovoltaic arrays being too large or too small, and easily leading to excessively high equipment costs for the photovoltaic plant. Summary of the Invention

[0004] The problem solved by the present invention is how to avoid the situation of photovoltaic array capacity imbalance and reduce the equipment cost of the photovoltaic power station.

[0005] To solve the above problems, the present invention provides a photovoltaic array arrangement method, device and storage medium.

[0006] In a first aspect, the present invention provides a photovoltaic array arrangement method, comprising:

[0007] Obtain the regional total capacity and maximum capacity ratio of the PV power station, as well as the maximum capacity of a single box-type transformer;

[0008] Based on a first preset rule, determining an initial combination of box-type transformers in the photovoltaic power station according to the total capacity of the region, the maximum capacity ratio, and the maximum capacity of the box-type transformers;

[0009] Optimizing the number of box transformers in the initial box transformer combination and the capacity of each box transformer according to a second preset rule to determine an optimal box transformer combination, wherein the number of photovoltaic arrays in the photovoltaic power station is equal to the number of box transformers in the optimal box transformer combination;

[0010] Determining the quantity range of photovoltaic devices in each photovoltaic array according to the optimal box-type transformer combination, and determining the capacity set of the corresponding photovoltaic array according to each quantity range, wherein the photovoltaic devices include a combiner box and / or an inverter;

[0011] Based on the principle that the number of photovoltaic arrays fully connected to the photovoltaic devices is the largest, the reference capacity of each photovoltaic array is determined according to the total capacity of the region and each capacity set.

[0012] Optionally, the determining the initial combination of box transformers in the photovoltaic power station based on the first preset rule and according to the total capacity of the region, the maximum capacity ratio, and the maximum capacity of the box transformers includes:

[0013] Determining the minimum total capacity of all the box transformers in the photovoltaic power station based on the total capacity of the area and the maximum capacity ratio, dividing the minimum total capacity of the box transformers by the maximum capacity of the box transformers, and rounding up the result of the division to obtain the minimum number of box transformers in the photovoltaic power station;

[0014] The initial combination of box transformers is determined according to the minimum number of box transformers and the maximum capacity of the box transformers, wherein the number of box transformers in the initial combination of box transformers is determined according to the minimum number of box transformers, and the capacity of each box transformer is the maximum capacity of the box transformer.

[0015] Optionally, the number of the initial combination of box-type transformers is at least one, and optimizing the number of box-type transformers in the initial combination of box-type transformers and the capacity of each box-type transformer according to a second preset rule to determine the optimal box-type transformer combination includes:

[0016] If the number of pre-stored box transformer types is one, then determining the optimal box transformer combination from all box transformer combinations to be selected, wherein the corresponding box transformer combination to be selected includes all the initial box transformer combinations;

[0017] If the number of the box transformer types is at least two, for each of the initial box transformer combinations, the box transformer type of at least one of the box transformers in the initial box transformer combination is replaced multiple times to obtain multiple replaced box transformer combinations; and the optimal box transformer combination is determined among all the box transformer combinations to be selected, wherein the corresponding box transformer combinations to be selected include all the initial box transformer combinations and the replaced box transformer combinations.

[0018] Optionally, determining the optimal box-type transformer combination among all candidate box-type transformer combinations includes:

[0019] For each of the candidate box-type transformer combinations, cluster all brackets in the photovoltaic power station into a plurality of photovoltaic arrays according to the number of box-type transformers in the candidate box-type transformer combination, and determine the actual capacity of each photovoltaic array, wherein the photovoltaic arrays correspond one-to-one to the box-type transformers in the candidate box-type transformer combination;

[0020] Determining a capacity reference value of each corresponding photovoltaic array according to the capacity of each box-type transformer in the to-be-selected box-type transformer combination and a preset capacity matching ratio, and matching the corresponding capacity reference value with the actual capacity;

[0021] According to the matching results corresponding to each candidate box-type transformer combination, the candidate box-type transformer combination whose capacity reference value is closest to the corresponding actual capacity is determined as the optimal box-type transformer combination.

[0022] Optionally, determining the optimal box-type transformer combination among all candidate box-type transformer combinations includes:

[0023] For each of the candidate box-type transformer combinations, calculating the sum of the number of box-type transformers in the candidate box-type transformer combination and the capacity of each box-type transformer;

[0024] According to the calculation results corresponding to each of the candidate box-type transformer combinations, the candidate box-type transformer combination with the smallest sum of the number of box-type transformers and the capacity of each box-type transformer is determined as the optimal box-type transformer combination.

[0025] Optionally, the quantity range includes an upper quantity limit and a lower quantity limit, and determining the quantity range of photovoltaic devices in each photovoltaic array according to the optimal box-type transformer combination includes:

[0026] For each of the box-type transformers in the optimal box-type transformer combination, determining the corresponding upper and lower capacity limits of the photovoltaic array according to the capacity of the box-type transformer and a preset capacity ratio range;

[0027] Determine the upper limit of the number of photovoltaic devices by combining the upper limit of capacity and the predetermined rated capacity of a single photovoltaic device, and determine the lower limit of the number of photovoltaic devices by combining the lower limit of capacity and the rated capacity of a single photovoltaic device;

[0028] and / or,

[0029] Determining the corresponding capacity set of the photovoltaic array according to each of the quantity ranges includes:

[0030] For each photovoltaic array, the capacity set is determined according to the corresponding upper limit value and lower limit value of the quantity, and the capacity set includes the photovoltaic array capacity when different numbers of photovoltaic devices are connected to the photovoltaic array.

[0031] Optionally, the photovoltaic arrays correspond one-to-one to the box transformers in the optimal box transformer combination, and determining the reference capacity of each photovoltaic array according to the regional total capacity and each capacity set includes:

[0032] With the goal of maximizing the number of photovoltaic arrays fully connected to the photovoltaic equipment, the reference capacity of each photovoltaic array is determined from the corresponding capacity set based on the total capacity of the region.

[0033] Optionally, after determining the reference capacity of each photovoltaic array according to the regional total capacity and each capacity set, the method further includes:

[0034] Determining a single-watt concentration degree of each of the photovoltaic arrays according to the reference capacity, and determining a photovoltaic array with abnormal capacity among all the photovoltaic arrays according to the single-watt concentration degree based on a preset judgment condition;

[0035] The photovoltaic array with abnormal capacity is split until the photovoltaic arrays obtained by splitting meet the preset judgment condition, and the number of the photovoltaic arrays after splitting and the capacity of each of the photovoltaic arrays after splitting are determined.

[0036] Optionally, the determining of a photovoltaic array with abnormal capacity among all the photovoltaic arrays according to the single-watt concentration based on a preset judgment condition includes:

[0037] Determining an average single-watt concentration of all the photovoltaic arrays according to the single-watt concentration;

[0038] Comparing the single-watt concentration of each photovoltaic array with the average single-watt concentration of a preset multiple, and determining, based on the comparison result, the photovoltaic array having a single-watt concentration greater than the average single-watt concentration of the preset multiple as the photovoltaic array with abnormal capacity;

[0039] or,

[0040] Performing a normal distribution on the single-watt concentration of all the photovoltaic arrays, and determining a preset proportion of the photovoltaic arrays as the photovoltaic arrays with abnormal capacity in descending order of the single-watt concentration according to the normal distribution;

[0041] or,

[0042] A standard deviation is determined based on the single-watt concentration of all the photovoltaic arrays, and the standard deviation is compared with a preset threshold. If the standard deviation is greater than the preset threshold, a preset number of the photovoltaic arrays are determined as the photovoltaic arrays with abnormal capacity in descending order of the single-watt concentration.

[0043] In a second aspect, the present invention provides a photovoltaic array arrangement device, comprising:

[0044] The acquisition module is used to obtain the regional total capacity and maximum capacity ratio of the photovoltaic power station, as well as the maximum capacity of a single box transformer;

[0045] an optimization module, configured to determine, based on a first preset rule, an initial combination of box transformers in the photovoltaic power station according to the total capacity of the region, the maximum capacity ratio, and the maximum capacity of the box transformers; and optimize, based on a second preset rule, the number of box transformers in the initial combination and the capacity of each box transformer to determine an optimal box transformer combination, wherein the number of photovoltaic arrays in the photovoltaic power station is equal to the number of box transformers in the optimal box transformer combination;

[0046] a calculation module, configured to determine a quantity range of photovoltaic devices in each photovoltaic array according to the optimal box-type transformer combination, and determine a corresponding capacity set of the photovoltaic array according to each quantity range, wherein the photovoltaic devices include a combiner box and / or an inverter;

[0047] A configuration module is configured to determine a reference capacity of each photovoltaic array according to the total capacity of the region and each capacity set based on the principle that the number of photovoltaic arrays fully connected to the photovoltaic equipment is the largest.

[0048] In a third aspect, the present invention provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the photovoltaic array arrangement method as described in any one of the first aspects is implemented.

[0049] The photovoltaic array arrangement method, device, and storage medium of the present invention have the following beneficial effects: based on a capacity ratio calculation formula, the minimum number of transformers in a photovoltaic power station can be calculated based on the obtained regional total capacity of the photovoltaic power station, the maximum capacity ratio, and the maximum capacity of each transformer. An initial transformer combination is then determined based on the minimum number of transformers. The number of transformers in the initial combination can be configured based on the minimum number of transformers, and the capacity of each transformer can be configured to the maximum capacity of the transformer. Based on a second preset rule, the number of transformers and the capacity of each transformer in the initial combination are optimized to determine an optimal transformer combination that meets the photovoltaic power station capacity requirements and minimizes cost. Since each photovoltaic array in the photovoltaic power station is equipped with a transformer, the number of photovoltaic arrays is equal to the number of transformers in the optimal combination. Based on the range of the capacity ratio, the range of the number of photovoltaic devices in each photovoltaic array, i.e., the range of the number of photovoltaic devices that can be connected to a photovoltaic array, can be calculated based on the capacity of each transformer in the optimal combination. Based on the corresponding number ranges, a capacity set for each photovoltaic array is determined. For a photovoltaic array, the capacity set includes its capacity at different capacity ratios. When a PV array uses the maximum capacity in the corresponding capacity set, it is considered fully connected. This means that the number of PV devices connected to the array reaches the corresponding upper limit. Therefore, based on the principle that fully connected PV arrays have the largest number of PV arrays, the reference capacity of the PV array is determined based on the total regional capacity and the capacity set of each PV array. This can avoid wasted device capacity in the PV array, reduce the total device capacity, and thus lower equipment costs. Furthermore, determining the capacity of each PV array based on the overall planning of the PV power station avoids capacity imbalances caused by individual PV arrays being too large or too small. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 A schematic flow chart of a photovoltaic array arrangement method according to an embodiment of the present invention;

[0051] Figure 2 This is a first photovoltaic array division scheme for a photovoltaic power station according to an embodiment of the present invention;

[0052] Figure 3 A second photovoltaic array division scheme of a photovoltaic power station according to an embodiment of the present invention;

[0053] Figure 4 This is a third photovoltaic array division scheme of a photovoltaic power station according to an embodiment of the present invention;

[0054] Figure 5 Schematic diagram of a narrow and long photovoltaic array according to an embodiment of the present invention;

[0055] Figure 6 for Figure 5 The schematic diagram of the disassembled narrow photovoltaic array shown;

[0056] Figure 7 This is a schematic structural diagram of a photovoltaic array arrangement device according to another embodiment of the present invention. DETAILED DESCRIPTION

[0057] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. Although certain embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as being limited to the embodiments described herein. Instead, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the drawings and embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0058] It should be understood that the various steps described in the method embodiments of the present invention may be performed in different orders and / or in parallel. In addition, the method embodiments may include additional steps and / or omit the steps shown. The scope of the present invention is not limited in this respect.

[0059] The term "including" and its variations used in this document are open inclusions, that is, "including but not limited to". The term "based on" means "based at least in part on". The term "optionally" means "optional embodiment". The relevant definitions of other terms will be given in the following description. It should be noted that the concepts of "first", "second", etc. mentioned in the present invention are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0060] It should be noted that the modifications of "one" and "multiple" mentioned in the present invention are illustrative rather than restrictive. Those skilled in the art should understand that unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0061] The names of the messages or information exchanged between multiple devices in the embodiments of the present invention are only used for illustrative purposes and are not used to limit the scope of these messages or information.

[0062] like Figure 1 As shown, an embodiment of the present invention provides a photovoltaic array arrangement method, comprising:

[0063] Step S110 , obtaining the regional total capacity and maximum capacity ratio of the photovoltaic power station, and the maximum capacity of a single box transformer.

[0064] Specifically, the number of strings in the PV power station can be obtained, and the rated capacity of the strings and the number of strings can be multiplied together to obtain the regional total capacity P of the PV power station. Alternatively, the preset regional total capacity P can be directly obtained, and the acquisition process is not restricted here. In addition, the preset capacity ratio R and its maximum upward floating value deltaR_max can be obtained, and the maximum capacity ratio is R+deltaR_max. The maximum capacity of a single box transformer refers to the maximum capacity of a box transformer, which can be determined based on the preset box transformer type, where each box transformer type corresponds to a box transformer capacity, and the maximum box transformer capacity is determined among all box transformer capacities corresponding to the preset box transformer type.

[0065] Step S120 : Based on a first preset rule, an initial combination of box-type transformers in the photovoltaic power station is determined according to the total capacity of the region, the maximum capacity ratio, and the maximum capacity of the box-type transformers.

[0066] Specifically, since each PV array in a PV power station is equipped with a box transformer, the number of PV arrays equals the number of box transformers. Assuming the initial box transformer combination contains n box transformers, and each box transformer uses the maximum box transformer capacity, the number of box transformers cannot be lower than the minimum box transformer number and can be increased based on the minimum box transformer number. Based on the capacity ratio calculation formula, the minimum total box transformer capacity in the PV power station can be determined by combining the total regional capacity and the maximum capacity ratio. This is the minimum sum of the capacities of all box transformers. Dividing the minimum total box transformer capacity by the maximum box transformer capacity yields the minimum number of box transformers in the PV power station. The number of box transformers in the initial box transformer combination is then determined based on the minimum number of box transformers.

[0067] Step S130, optimizing the number of box transformers in the initial box transformer combination and the capacity of each box transformer according to a second preset rule, and determining an optimal box transformer combination, wherein the number of photovoltaic arrays in the photovoltaic power station is equal to the number of box transformers in the optimal box transformer combination.

[0068] Specifically, since the cost of box transformers is proportional to the number and capacity of box transformers, in order to reduce the cost of box transformers, the number of box transformers and the capacity of each box transformer in the initial combination of box transformers are optimized to determine the optimal box transformer combination that can meet the capacity requirements and has the lowest cost.

[0069] Step S140 , determining the quantity range of photovoltaic devices in each photovoltaic array according to the optimal box-type transformer combination, and determining the capacity set of the corresponding photovoltaic array according to each quantity range, wherein the photovoltaic devices include a combiner box and / or an inverter.

[0070] Specifically, assuming the optimal packaged transformer combination includes m packaged transformers, designated K1, K2, ..., Km, then for any packaged transformer Ks in the optimal packaged transformer combination, where s = 1, 2, ..., m, the upper and lower limits for the number of PV devices connected to the corresponding PV array are calculated based on the capacity of the packaged transformer Ks. The capacity set includes the capacity of the PV array when connected to different numbers of PV devices. The maximum capacity of the PV array when the upper limit is used is calculated; the minimum capacity of the PV array when the lower limit is used is calculated; and multiple intermediate capacities between the maximum and minimum capacities are calculated based on intermediate values between the upper and lower limits. The capacities of all PV arrays constitute the capacity set. If the packaged transformer uses a packaged inverter, the PV device is a combiner box. If the packaged transformer does not use a packaged inverter, the PV device is a combiner box and / or inverter.

[0071] Step S150 , based on the principle that the number of photovoltaic arrays fully connected to the photovoltaic equipment is the largest, a reference capacity of each photovoltaic array is determined according to the total capacity of the region and each capacity set.

[0072] Specifically, fully connecting photovoltaic devices in a photovoltaic array means that the number of photovoltaic devices connected to the photovoltaic array takes the upper limit value. Fully connecting photovoltaic devices can reduce the waste of box transformer capacity in the photovoltaic array and improve the capacity utilization rate of the photovoltaic array.

[0073] In this embodiment, a capacity ratio calculation formula can be used to calculate the minimum number of transformers in a PV power station based on the obtained regional total capacity of the PV power station, the maximum capacity ratio, and the maximum capacity of each transformer. An initial transformer combination can then be determined based on the minimum number of transformers. The number of transformers in the initial combination can be configured based on the minimum number of transformers, and the capacity of each transformer can be configured to the maximum capacity of the transformer. The number of transformers and the capacity of each transformer in the initial combination can be optimized based on a second preset rule to determine an optimal transformer combination that meets the PV power station's capacity requirements and minimizes cost. Since each PV array in the PV power station is equipped with a transformer, the number of PV arrays is equal to the number of transformers in the optimal combination. Based on the range of capacity ratios, the range of the number of PV devices in each PV array, i.e., the range of the number of PV devices that can be connected to a PV array, can be calculated based on the capacity of each transformer in the optimal combination. Based on the corresponding number ranges, a capacity set for each PV array is determined. For a PV array, the capacity set includes its capacity at different capacity ratios. When a PV array uses the maximum capacity in the corresponding capacity set, it is considered fully connected. This means that the number of PV devices connected to the array reaches the corresponding upper limit. Therefore, based on the principle that fully connected PV arrays have the largest number of PV arrays, the reference capacity of the PV array is determined based on the total regional capacity and the capacity set of each PV array. This can avoid wasted device capacity in the PV array, reduce the total device capacity, and thus lower equipment costs. Furthermore, determining the capacity of each PV array based on the overall planning of the PV power station avoids capacity imbalances caused by individual PV arrays being too large or too small.

[0074] Optionally, the determining the initial combination of box transformers in the photovoltaic power station based on the first preset rule and according to the total capacity of the region, the maximum capacity ratio, and the maximum capacity of the box transformers includes:

[0075] Determine the minimum total capacity of all the box transformers in the photovoltaic power station based on the total capacity of the area and the maximum capacity ratio, divide the minimum total capacity of the box transformer by the maximum capacity of the box transformer, and round up the result of the division to obtain the minimum number of box transformers in the photovoltaic power station.

[0076] Specifically, the calculation process of the minimum number of box transformers can be expressed by the following calculation formula: XB_num = ceil(P / (R+deltaR_max) / XB_power_max), where XB_num represents the minimum number of box transformers, ceil represents the upward rounding function, P represents the total regional capacity of the photovoltaic power station, R represents the preset capacity ratio, deltaR_max represents the maximum value of the capacity ratio floating upward, and XB_power_max represents the maximum capacity of the box transformer.

[0077] The initial combination of box transformers is determined according to the minimum number of box transformers and the maximum capacity of the box transformers, wherein the number of box transformers in the initial combination of box transformers is determined according to the minimum number of box transformers, and the capacity of each box transformer is the maximum capacity of the box transformer.

[0078] Specifically, an initial combination of box-type transformers consists of multiple box-type transformers, each of which uses the maximum capacity. The number of box-type transformers fluctuates upward based on the minimum number of box-type transformers. Therefore, multiple initial combinations of box-type transformers can be obtained based on the change in the number during the upward fluctuation. For example, if the minimum number of box-type transformers is XB_num, the first initial combination of box-type transformers includes XB_num box-type transformers with the maximum capacity, the second initial combination of box-type transformers includes XB_num box-type transformers with the maximum capacity, the third initial combination of box-type transformers includes XB_num box-type transformers with the maximum capacity, and so on. The range of the upward fluctuation can be determined based on actual conditions or historical experience, and Comb0 can be used to represent each initial combination of box-type transformers.

[0079] In this optional embodiment, the minimum number of box transformers in the photovoltaic power station is calculated based on the capacity ratio calculation formula, and then the initial combination of box transformers is determined according to the minimum number of box transformers. This can prevent the number of photovoltaic arrays obtained by division from being lower than the minimum number of box transformers, and ensure that the capacity of the photovoltaic array meets the capacity requirements of the photovoltaic power station.

[0080] Optionally, the number of the initial combination of box-type transformers is at least one, and optimizing the number of box-type transformers in the initial combination of box-type transformers and the capacity of each box-type transformer according to a second preset rule to determine the optimal box-type transformer combination includes:

[0081] If the number of pre-stored box transformer types is one, the optimal box transformer combination is determined from all box transformer combinations to be selected, wherein the corresponding box transformer combinations to be selected include all the initial box transformer combinations.

[0082] Specifically, as mentioned above, the maximum capacity of the box transformer is determined from all the box transformer capacities corresponding to the box transformer type. When planning and designing a photovoltaic power station, the box transformer type that can be used for the photovoltaic power station can be determined based on actual conditions such as the budget and equipment conditions. The various box transformer types are stored in a storage device such as a database or memory. Each box transformer type corresponds to a box transformer capacity, such as a box transformer with a capacity of 2500kW, a box transformer with a capacity of 1600kW, and so on. When optimizing the initial combination of box transformers, the number of box transformer types stored in the storage device is determined. If there is only one box transformer type, that is, the maximum capacity of each box transformer in the initial combination of box transformers is the capacity corresponding to the box transformer type, all box transformers can only be the box transformer type corresponding to the maximum capacity of the box transformer. There is only a combination method corresponding to each initial combination of box transformers. Therefore, the optimal box transformer combination is directly determined among all the initial combinations of box transformers.

[0083] If the number of the box transformer types is at least two, for each of the initial box transformer combinations, the box transformer type of at least one of the box transformers in the initial box transformer combination is replaced multiple times to obtain multiple replaced box transformer combinations; and the optimal box transformer combination is determined among all the box transformer combinations to be selected, wherein the corresponding box transformer combinations to be selected include all the initial box transformer combinations and the replaced box transformer combinations.

[0084] Specifically, if there are at least two types of box transformers, multiple box transformer combinations after replacement are obtained by replacing the box transformer types in the initial box transformer combination. Then, the optimal box transformer combination is determined among all the initial box transformer combinations and the replaced box transformer combinations.

[0085] For example, when replacing a box-type transformer in the initial combination, first assume that there are a total of n box-type transformers. Then, let n-1 of them use the maximum capacity of the box-type transformer. After subtracting the maximum capacity of the box-type transformer corresponding to n-1 box-type transformer from the total area capacity P, divide it by the maximum capacity ratio to obtain the remaining box-type transformer capacity. The calculation process can be expressed as follows:

[0086] Delta_p1=(P-(n-1)*XB_power_max*(R+deltaR_max)) / (R+deltaR_max),

[0087] Delta_p1 is the remaining transformer capacity, XB_power_max is the maximum transformer capacity, and R+deltaR_max represents the maximum capacity ratio. The remaining transformer capacity is matched with the capacity corresponding to each transformer type, and the transformer type with the closest capacity to the remaining transformer capacity is determined upward. For example, if the remaining transformer capacity is 1500kW, the closest transformer type upward is 2000kW, and the closest transformer type downward is 1300kW. Although 1300kW is closest to the remaining transformer capacity, to ensure that the transformer can accommodate the remaining transformer capacity, 2000kW is determined as the matching transformer type. The type of the last transformer in all the transformers arranged in sequence in the initial transformer combination is replaced with the matched transformer type. This results in a transformer combination after replacing one transformer type, which can be represented by Comb1.

[0088] It should be noted that after replacing the packaged transformer type to obtain packaged transformer combination Comb1, it is necessary to determine whether the P / XB_glo_Comb1 capacity ratio is within the preset range, where P is the total regional capacity of the PV power plant, and XB_glo_Comb1 is the sum of the capacities of all packaged transformers in packaged transformer combination Comb1. If so, packaged transformer combination Comb1 is retained. If not, it is necessary to re-match the closest packaged transformer type.

[0089] Similarly, when replacing two box-type transformers in the initial combination, first set the maximum capacity of the box-type transformers for n-2 box-type transformers. Subtract the maximum capacity of the box-type transformers corresponding to n-2 box-type transformers from the total regional capacity P, and divide it by the maximum capacity ratio to obtain the remaining box-type transformer capacity. The calculation process can be expressed as follows:

[0090] Delta_p2=(P-(n-2)*XB_power_max*(R+deltaR_max)) / (R+deltaR_max),

[0091] Delta_p2 is the remaining box-type transformer capacity. The remaining box-type transformer capacity is matched with the sum of the capacities of every two box-type transformer types. The two box-type transformer types whose sum of capacities is closest to the remaining box-type transformer capacity are determined upward. The last two box-type transformers in the initial box-type transformer combination are replaced. Comb2 represents the resulting box-type transformer combination.

[0092] It should be noted that after replacing the box-type transformer to obtain box-type transformer combination Comb2, it is necessary to determine whether the P / XB_glo_Comb2 capacity ratio is within the preset range, where P is the total regional capacity of the PV power plant, and XB_glo_Comb1 is the sum of the capacities of all box-type transformers in box-type transformer combination Comb2. If so, box-type transformer combination Comb2 is retained. If not, it is necessary to re-match the two box-type transformers that are closest to the same capacity.

[0093] Similarly, when replacing three box-type transformers in the initial combination, first set the n-3 box-type transformers to use the maximum box-type transformer capacity. After subtracting the maximum box-type transformer capacity corresponding to the n-3 box-type transformers from the total area capacity P, divide it by the maximum capacity ratio to obtain the remaining box-type transformer capacity. The calculation process can be expressed as follows:

[0094] Delta_p3=(P-(n-2)*XB_power_max*(R+deltaR_max)) / (R+deltaR_max),

[0095] Delta_p3 is the remaining box-type transformer capacity. The remaining box-type transformer capacity is matched with the sum of the capacities corresponding to each of the three box-type transformer types. The three box-type transformer types whose sum of capacities is closest to the remaining box-type transformer capacity are determined upward. The last three box-type transformers in the initial box-type transformer combination are replaced. Comb3 is used to represent the resulting box-type transformer combination.

[0096] It should be noted that after replacing the packaged transformer type to obtain packaged transformer combination Comb3, it is necessary to determine whether the P / XB_glo_Comb3 capacity ratio is within the preset range, where P is the total regional capacity of the PV power plant, and XB_glo_Comb3 is the sum of the capacities of all packaged transformers in packaged transformer combination Comb3. If so, packaged transformer combination Comb3 is retained. If not, it is necessary to re-match the three closest packaged transformer types.

[0097] Similarly, by replacing the transformer types in the initial combination of box-type transformers multiple times, multiple box-type transformer combinations are obtained, as shown in Table 1.

[0098] Table 1 Schematic diagram of box-type transformer combination

[0099] Group capacity Combination 1 2500kW*9+1250kW Combination 2 2500kW*9+1600kW Combination 3 2500kW*8+1250kW+1600kW Combination 4 2500kW*8+1600kW*2 …… ……

[0100] In Table 1, combination 1 includes 9 box transformers with a capacity of 2500kW and 1 box transformer with a capacity of 1250kW, combination 2 includes 9 box transformers with a capacity of 2500kW and 1 box transformer with a capacity of 1600kW, and so on. They will not be described in detail later.

[0101] In this optional embodiment, based on the initial combination of box transformers, multiple box transformer combinations are determined by optimizing the number of box transformers and the capacity of each box transformer, and the optimal box transformer combination is determined among all box transformer combinations, which can reduce the box transformer cost while meeting the preset box transformer type.

[0102] Optionally, determining the optimal box-type transformer combination among all candidate box-type transformer combinations includes:

[0103] For each of the candidate box-type transformer combinations, cluster all brackets in the photovoltaic power station into a plurality of photovoltaic arrays according to the number of box-type transformers in the candidate box-type transformer combination, and determine the actual capacity of each photovoltaic array, wherein the photovoltaic arrays correspond one-to-one to the box-type transformers in the candidate box-type transformer combination;

[0104] Determining a capacity reference value of each corresponding photovoltaic array according to the capacity of each box-type transformer in the to-be-selected box-type transformer combination and a preset capacity matching ratio, and matching the corresponding capacity reference value with the actual capacity;

[0105] According to the matching results corresponding to each candidate box-type transformer combination, the candidate box-type transformer combination whose capacity reference value is closest to the corresponding actual capacity is determined as the optimal box-type transformer combination.

[0106] Specifically, assuming that a candidate box-type transformer combination includes t box-type transformers, which corresponds to t photovoltaic arrays, the actual capacity of any photovoltaic array is P i , the capacity reference value of any photovoltaic array is P i, then calculate the matching degree between the capacity reference value and the actual capacity according to the following formula:

[0107]

[0108] Where abs represents the absolute value. The candidate transformer combination with the smallest matching degree is finally determined as the optimal transformer combination. The optimal transformer combination can be represented by Comb_final.

[0109] In this optional embodiment, the capacity reference value of each photovoltaic array in the candidate transformer combination is used to match the corresponding capacity reference value with the actual capacity to determine the optimal transformer combination. This can make the determined optimal transformer combination close to the actual situation and improve its adaptability to actual on-site needs.

[0110] Optionally, determining the optimal box-type transformer combination among all candidate box-type transformer combinations includes:

[0111] For each of the candidate box-type transformer combinations, the sum of the number of box-type transformers in the candidate box-type transformer combination and the capacity of each box-type transformer is calculated.

[0112] Specifically, for a candidate box-type transformer combination, the number of box-type transformers and the capacity of each box-type transformer are sequentially added to obtain a calculation result.

[0113] According to the calculation results corresponding to each of the candidate box-type transformer combinations, the candidate box-type transformer combination with the smallest sum of the number of box-type transformers and the capacity of each box-type transformer is determined as the optimal box-type transformer combination.

[0114] Specifically, the candidate box-type transformer combination with the smallest calculation result is selected as the optimal box-type transformer combination Comb_final.

[0115] In this optional embodiment, the candidate box transformer combination with the smallest sum of the number of box transformers and the capacity of each box transformer is determined as the optimal box transformer combination, which can reduce equipment costs as much as possible while meeting the capacity requirements of the photovoltaic power station and has high calculation efficiency.

[0116] For example, Figures 2 to 4 As shown, taking a 42MW photovoltaic power station in a mountain as an example, Figures 2 to 4 Different array division schemes correspond to different box-type transformer combination schemes. The economic comparison table of three different box-type transformer combination schemes is shown in Table 2.

[0117] Table 2 Economic comparison of three different box-type transformer combination schemes

[0118] type Number of arrays Box transformer ratio LCOE / yuan / W Solution 1 18 14*2500kW+4*1600kW 0.3113 Option 2 20 12*2500kW+8*1600kW 0.3120 Option 3 19 13*2500kW+5*1600kW 0.3107

[0119] Table 2 shows that different array partitioning schemes correspond to different box-type transformer combination schemes, and the corresponding LCOE (Levelized Cost of Energy) is also different. To save power generation costs, this example can choose Scheme 3, which can reduce the power generation cost of the PV power station while meeting the array capacity requirements.

[0120] Optionally, the quantity range includes an upper quantity limit and a lower quantity limit, and determining the quantity range of photovoltaic devices in each photovoltaic array according to the optimal box-type transformer combination includes:

[0121] For each of the box-type transformers in the optimal box-type transformer combination, an upper capacity limit and a lower capacity limit of the corresponding photovoltaic array are determined according to the capacity of the box-type transformer and a preset capacity ratio range.

[0122] Specifically, based on the calculation formula of the capacity ratio, the upper limit of the capacity of the photovoltaic array can be obtained by multiplying the capacity of the box transformer by the maximum capacity ratio, and the lower limit of the capacity of the photovoltaic array can be obtained by multiplying the capacity of the box transformer by the minimum capacity ratio.

[0123] The upper limit value of the number of photovoltaic devices is determined by combining the upper limit value of capacity and the predetermined rated capacity of a single photovoltaic device, and the lower limit value of the number of photovoltaic devices is determined by combining the lower limit value of capacity and the rated capacity of a single photovoltaic device.

[0124] Specifically, the capacity upper limit is divided by the rated capacity of a single photovoltaic device, and the result is rounded down to obtain the upper limit of the number of photovoltaic devices. The specific calculation process can be expressed as follows:

[0125] HL_num_max=floor(Cap_num_glo_max / (HLbranches_Num*zc_power)),

[0126] Divide the capacity lower limit by the rated capacity of a single PV device and round up the result to get the lower limit of the number of PV devices. The specific calculation process can be expressed as follows:

[0127] HL_num_min=ceil(Cap_num_glo_min / (HLbranches_Num*zc_power)),

[0128] Wherein, HL_num_max represents the upper limit of the number of PV devices, floor represents the floor rounding function, Cap_num_glo_max represents the upper limit of the capacity, HLbranches_Num represents the number of strings connected to a single PV device, zc_power represents the rated power of a single string, HL_num_min represents the lower limit of the number of PV devices, ceil represents the ceiling rounding function, and Cap_num_glo_min represents the lower limit of the capacity.

[0129] In this optional embodiment, the capacity range of each photovoltaic array is calculated based on the capacity ratio range and the capacity of each box transformer in the optimal box transformer, and then the number range of photovoltaic devices in each photovoltaic array is calculated based on the corresponding capacity range, so as to facilitate optimization within the limited number range and improve the optimization efficiency.

[0130] Optionally, determining the corresponding capacity set of the photovoltaic array according to each of the quantity ranges includes:

[0131] For each photovoltaic array, the capacity set is determined according to the corresponding upper limit value and lower limit value of the quantity, and the capacity set includes the photovoltaic array capacity when different numbers of photovoltaic devices are connected to the photovoltaic array.

[0132] Specifically, the maximum capacity of a photovoltaic array when fully connected to photovoltaic devices can be calculated based on the upper limit of the number, which can be expressed by the following formula:

[0133] Sat_Cap_num_glo_max=HL_num_max*HLbranches_Num*zc_power,

[0134] Among them, Sat_Cap_num_glo_max represents the maximum capacity of the PV array, that is, the capacity when fully connected to PV devices, and HL_num_max represents the upper limit of the number of PV devices.

[0135] The minimum capacity of the photovoltaic array when the least photovoltaic equipment is connected is calculated based on the lower limit of the number, which can be expressed by the following formula:

[0136] Sat_Cap_num_glo_min=HL_num_min*HLbranches_Num*zc_power,

[0137] Among them, Sat_Cap_num_glo_min represents the minimum capacity of the PV array, and HL_num_min represents the lower limit of the number of PV devices.

[0138] The intermediate capacity of the PV array is calculated based on the intermediate value between the upper limit and the lower limit, which can be expressed by the following formula:

[0139] Sat_Cap_num_glo_medium=(HL_num_max-x)*HLbranches_Num*zc_power,

[0140] Where Sat_Cap_num_glo_medium is the median capacity of the PV array. x is a positive integer, and HL_num_max - x is greater than HL_num_min and less than HL_num_max. Assume that when x = 1, the corresponding median capacity is Sat_Cap_num_glo_medium1; when x = 2, the corresponding median capacity is Sat_Cap_num_glo_medium, and so on. The capacity set of a PV array can be expressed as {Sat_Cap_num_glo_max, Sat_Cap_num_glo_medium1, Sat_Cap_num_glo_medium2, ..., Sat_Cap_num_glo_min}.

[0141] In this optional embodiment, by determining the capacity of each photovoltaic array at different capacity ratios, it is convenient to optimize the capacity of the photovoltaic array to determine the reference capacity that meets the capacity requirements and has the lowest cost.

[0142] Optionally, the photovoltaic arrays correspond one-to-one to the box transformers in the optimal box transformer combination, and determining the reference capacity of each photovoltaic array according to the regional total capacity and each capacity set includes:

[0143] With the goal of maximizing the number of photovoltaic arrays fully connected to the photovoltaic equipment, the reference capacity of each photovoltaic array is determined from the corresponding capacity set based on the total capacity of the region.

[0144] Specifically, a fully connected PV array means the number of connected PV devices in the PV array is capped at the upper limit, and the reference capacity of each PV array is configured based on the total regional capacity. Assuming there are j PV arrays fully connected, i.e., the reference capacity of each of these j PV arrays is the maximum capacity in the corresponding capacity set. The remaining capacity is obtained by subtracting the maximum capacity corresponding to each of the j PV arrays from the total regional capacity P. This should be greater than the sum of the minimum capacities of all remaining PV arrays and less than the sum of the maximum capacities of all remaining PV arrays. The maximum value of j that satisfies this condition is determined. At this point, the number of PV arrays fully connected is the largest, and the reference capacity of the j PV arrays that meet this condition is determined to be the maximum capacity in the corresponding capacity set.

[0145] After determining the number \(j\) of photovoltaic arrays of a fully-connected photovoltaic device, assume that the reference capacity of the photovoltaic array takes the second-largest capacity in the corresponding capacity set, which is \(k\) in number. The second-largest capacity is the intermediate capacity \(Sat\_Cap\_num\_glo\_medium1\) when \(x = 1\). After subtracting the reference capacities of the above-determined \(j\) photovoltaic arrays from the total regional capacity in sequence, and then subtracting the second-largest capacity corresponding to \(k\) photovoltaic arrays in sequence, the remaining capacity should be greater than the sum of the minimum capacities corresponding to all the remaining photovoltaic arrays and less than the sum of the maximum capacities corresponding to all the remaining photovoltaic arrays. Determine the maximum value of \(k\) that satisfies this condition, and at this time, the reference capacities of the corresponding \(k\) photovoltaic arrays are taken as the second-largest capacity in the corresponding capacity set.

[0146] Determine the photovoltaic arrays with reference capacities taken as the third-largest capacity, the fourth-largest capacity, etc. in the corresponding capacity set in sequence, until the reference capacities of all photovoltaic arrays are determined. Among them, for the last photovoltaic array, if the remaining capacity is not equal to each capacity in the capacity set of this photovoltaic array, then take the capacity closest to the remaining capacity in the capacity set upward as the reference capacity of the last photovoltaic array.

[0147] Alternatively, after determining the values of \(j\) and \(k\), compare the sum of \(j\) and \(k\) with the number of photovoltaic arrays \(XB\_num\), and determine the reference capacities of the remaining arrays according to the comparison result.

[0148] Among them, if \(j + k\lt XB\_num\), the reference capacities of the remaining arrays are determined according to the remaining transformer substation types. That is, first subtract the reference capacities of the determined photovoltaic arrays from the total regional capacity in sequence to obtain the remaining capacity; then divide the remaining capacity by the sum of the capacities corresponding to the remaining transformer substation types of the arrays to obtain the capacity ratio reference value; multiply the capacity ratio reference value by the capacities corresponding to the remaining transformer substation types of each remaining photovoltaic array respectively to obtain the reference capacities of each remaining photovoltaic array.

[0149] If \(j + k = XB\_num\), it means there are no remaining photovoltaic arrays, and the reference capacities of the photovoltaic arrays in the photovoltaic power station are taken as the corresponding maximum capacity or the second-largest capacity.

[0150] For example, it is assumed that there are 4 photovoltaic arrays determined according to the number of box transformers in the optimal box transformer combination, and the 4 photovoltaic arrays are A, B, C, and D, where the capacity set corresponding to photovoltaic array A is {2700kW, 2400kW, 2100kW, 1800kW}, the capacity set corresponding to photovoltaic array B is {2400kW, 2100kW, 1800kW, 1500kW}, the capacity set corresponding to photovoltaic array C is {1800kW, 1500kW, 1200kW, 900kW} and the capacity set corresponding to photovoltaic array D is {1800kW, 1500kW, 1200kW, 900kW}, and the total regional capacity P is 7000kW. First, determine the maximum number of PV arrays j for a fully connected PV system. For example, if PV arrays A and B are fully connected, then after subtracting the maximum capacity of PV array A (2700kW) and the maximum capacity of PV array D (2400kW) from the total regional capacity P, the remaining capacity is 1900kW. This is greater than the sum of the remaining minimum capacity of PV array C (900kW) and the minimum capacity of PV array D (900kW), but less than the sum of the remaining maximum capacity of PV array C (1800kW) and the maximum capacity of PV array D (1800kW), thus meeting the configuration requirements. Using the same method, we can ultimately determine that the number of PV arrays j for a fully connected PV system can be 1 or 2. A value of 1 corresponds to a full connection of any one of PV arrays A, B, C, and D, while a value of 2 corresponds to a full connection of any two of PV arrays A, B, C, and D. Therefore, j takes the maximum value of 2. Next, the reference capacity is determined to be the number k of PV arrays with the second-largest capacity in the corresponding capacity set. For example, if PV arrays A and B are fully connected and PV array C takes the second-largest capacity in the corresponding capacity set, then the total regional capacity P is deducted from the maximum capacity of PV array A (2700kW), the maximum capacity of PV array B (2400kW), and the second-largest capacity of PV array C (1500kW). The remaining capacity is 400kW, which is less than the minimum capacity of the remaining PV array D (900kW), thus failing to meet the configuration requirements. Using the same method, the number k of PV arrays with the second-largest capacity can be determined to be 0, indicating that no PV array has the reference capacity of the second-largest capacity. Since j + k = 2, which is less than the number of PV arrays (4), the reference capacity of the remaining PV arrays is determined based on the corresponding box-type transformers. Taking PV arrays A and B fully connected as an example, the remaining capacity is 1900 kW. The remaining capacity of 1900 is divided by the sum of the capacities of the box-type transformers corresponding to PV arrays C and D to obtain the reference capacity ratio. Finally, the reference capacity ratio is multiplied by the capacity corresponding to the box-type transformer in PV array C to obtain the reference capacity of PV array C; the reference capacity ratio is multiplied by the capacity corresponding to the box-type transformer in PV array D to obtain the reference capacity of PV array D.

[0151] The reference capacities of the PV arrays obtained in this example include multiple options. For example, when PV arrays A and B are fully connected, the reference capacities of PV arrays C and D are determined based on a reference capacity ratio. When PV arrays A and C are fully connected, the reference capacities of PV arrays B and D are determined based on a reference capacity ratio. The sum of the reference capacities of PV arrays A, B, C, and D in each option can be determined, and the option with the smallest sum of reference capacities is selected as the final option.

[0152] In this optional embodiment, the reference capacity of each photovoltaic array is optimized with the goal of maximizing the number of photovoltaic arrays that are fully connected to photovoltaic equipment. This can avoid wasting the reference capacity of each photovoltaic array, improve the capacity utilization of the photovoltaic array, and make the final total reference capacity of the photovoltaic array as low as possible, thereby reducing the total capacity of the equipment and thus reducing the equipment cost.

[0153] Optionally, after determining the reference capacity of each photovoltaic array according to the regional total capacity and each capacity set, the method further includes:

[0154] The single-watt concentration of each photovoltaic array is determined according to the reference capacity, and a photovoltaic array with abnormal capacity is determined among all the photovoltaic arrays based on the single-watt concentration based on a preset judgment condition.

[0155] Specifically, the single-watt concentration of a photovoltaic array can be calculated using the following formula:

[0156]

[0157] Among them, C s Indicates the concentration of a single watt, Dis indicates the sum of the distances from all the strings in the photovoltaic array to the box transformer, P stc Indicates the reference capacity of the PV array.

[0158] The photovoltaic array with abnormal capacity is split until the photovoltaic arrays obtained by splitting meet the preset judgment condition, and the number of the photovoltaic arrays after splitting and the capacity of each of the photovoltaic arrays after splitting are determined.

[0159] Specifically, the capacity of the photovoltaic array after splitting can be determined according to the ratio of the photovoltaic array after splitting to the original photovoltaic array, or the capacity of the photovoltaic array after splitting can be determined by using the reference capacity determination method mentioned above.

[0160] In this optional embodiment, the photovoltaic array with abnormal capacity is usually a photovoltaic array with a narrow and long shape. The low-voltage cable in the photovoltaic array is long. By splitting, the length of the low-voltage cable can be reduced, thereby reducing the cable cost.

[0161] Optionally, the determining of a photovoltaic array with abnormal capacity among all the photovoltaic arrays according to the single-watt concentration based on a preset judgment condition includes:

[0162] An average single-watt concentration of all the photovoltaic arrays is determined according to the single-watt concentration.

[0163] Specifically, the average concentration of a single watt reflects the degree of concentration in a photovoltaic power station. The average concentration of a single watt can be calculated using the following formula:

[0164]

[0165] in, represents the average single-watt concentration, k represents the number of photovoltaic arrays, and Csi represents the single-watt concentration of the i-th photovoltaic array.

[0166] The single-watt concentration of each photovoltaic array is compared with the single-watt concentration average value of a preset multiple, and the photovoltaic array with a single-watt concentration average value greater than the preset multiple is determined as the photovoltaic array with abnormal capacity based on the comparison result.

[0167] Specifically, determine The PV array is a PV array with abnormal capacity, and m is a preset multiple.

[0168] Optionally, a normal distribution is made for the single-watt concentration of all the photovoltaic arrays, and a preset proportion of the photovoltaic arrays are determined as the photovoltaic arrays with abnormal capacity in descending order of the single-watt concentration according to the normal distribution.

[0169] Optionally, a standard deviation is determined based on the single-watt concentration of all the photovoltaic arrays, and the standard deviation is compared with a preset threshold. If the standard deviation is greater than the preset threshold, a preset number of the photovoltaic arrays are determined as the photovoltaic arrays with abnormal capacity in order of the single-watt concentration from large to small.

[0170] For example, taking a photovoltaic power station in a complex and narrow terrain as an example, Figure 5 This is a schematic diagram of a long and narrow photovoltaic array before splitting. Figure 6 The schematic diagram of the two photovoltaic arrays obtained after the split is shown in Table 3. The cost comparison results before and after the photovoltaic array split are shown in Table 3.

[0171] Table 3 Cost comparison results before and after PV array splitting

[0172] Photovoltaic array Cost before split / yuan Cost after split / yuan 1 538704.5 151447.5 2 / 143380.1 Total cost 538704.5 294827.6

[0173] It can be seen from Table 3 that for narrow and long photovoltaic arrays with abnormal single-watt concentration, that is, abnormal capacity, splitting them can effectively reduce costs with significant results.

[0174] like Figure 7As shown, another embodiment of the present invention provides a photovoltaic array arrangement device, comprising:

[0175] The acquisition module is used to obtain the regional total capacity and maximum capacity ratio of the photovoltaic power station, as well as the maximum capacity of a single box transformer;

[0176] an optimization module, configured to determine, based on a first preset rule, an initial combination of box transformers in the photovoltaic power station according to the total capacity of the region, the maximum capacity ratio, and the maximum capacity of the box transformers; and optimize, based on a second preset rule, the number of box transformers in the initial combination and the capacity of each box transformer to determine an optimal box transformer combination, wherein the number of photovoltaic arrays in the photovoltaic power station is equal to the number of box transformers in the optimal box transformer combination;

[0177] a calculation module, configured to determine a quantity range of photovoltaic devices in each photovoltaic array according to the optimal box-type transformer combination, and determine a corresponding capacity set of the photovoltaic array according to each quantity range, wherein the photovoltaic devices include a combiner box and / or an inverter;

[0178] A configuration module is configured to determine a reference capacity of each photovoltaic array according to the total capacity of the region and each capacity set based on the principle that the number of photovoltaic arrays fully connected to the photovoltaic equipment is the largest.

[0179] The photovoltaic array arrangement device of this embodiment is used to implement the photovoltaic array arrangement method described above, and its beneficial effects correspond to the beneficial effects of the photovoltaic array arrangement method, which will not be described in detail here.

[0180] Optionally, the optimization module is specifically used to: determine the minimum total capacity of all the box transformers in the photovoltaic power station based on the total capacity of the area and the maximum capacity ratio, divide the minimum total capacity of the box transformer by the maximum capacity of the box transformer, and round up the result of the division to obtain the minimum number of box transformers in the photovoltaic power station; determine the initial combination of box transformers based on the minimum number of box transformers and the maximum capacity of the box transformers, wherein the number of box transformers in the initial combination of box transformers is determined based on the minimum number of box transformers, and the capacity of each box transformer is the maximum capacity of the box transformer.

[0181] Optionally, the number of the initial box transformer combinations is at least one, and the optimization module is specifically further used to: if the number of pre-stored box transformer types is one, then determine the optimal box transformer combination among all the box transformer combinations to be selected, wherein the corresponding box transformer combination to be selected includes all the initial box transformer combinations; if the number of the box transformer types is at least two, then for each initial box transformer combination, replace the box transformer type of at least one box transformer in the initial box transformer combination multiple times to obtain multiple replaced box transformer combinations; and determine the optimal box transformer combination among all the box transformer combinations to be selected, wherein the corresponding box transformer combination to be selected includes all the initial box transformer combinations and the replaced box transformer combinations.

[0182] Optionally, the optimization module is further configured to: for each of the candidate box-transformer combinations, cluster all brackets in the photovoltaic power station into a plurality of photovoltaic arrays according to the number of box-transformers in the candidate box-transformer combination, determine the actual capacity of each photovoltaic array, and the photovoltaic array corresponds one-to-one to the box-transformers in the candidate box-transformer combination; determine the capacity reference value of each corresponding photovoltaic array according to the capacity of each box-transformer in the candidate box-transformer combination and a preset capacity ratio, and match the corresponding capacity reference value with the actual capacity; according to the matching result corresponding to each of the candidate box-transformer combinations, determine the candidate box-transformer combination whose capacity reference value is closest to the corresponding actual capacity as the optimal box-transformer combination;

[0183] Alternatively, for each of the candidate box-type transformer combinations, the sum of the number of box-type transformers and the capacity of each box-type transformer in the candidate box-type transformer combination is calculated; based on the calculation results corresponding to each of the candidate box-type transformer combinations, the candidate box-type transformer combination with the smallest sum of the number of box-type transformers and the capacity of each box-type transformer is determined as the optimal box-type transformer combination.

[0184] Optionally, the quantity range includes an upper quantity limit value and a lower quantity limit value, and the calculation module is specifically configured to: for each box transformer in the optimal box transformer combination, determine the corresponding upper capacity limit value and lower capacity limit value of the photovoltaic array according to the capacity of the box transformer and a preset capacity ratio range; determine the upper quantity limit value of the photovoltaic devices by combining the upper capacity limit value and a predetermined rated capacity of a single photovoltaic device, and determine the lower quantity limit value of the photovoltaic devices by combining the lower capacity limit value and the rated capacity of a single photovoltaic device;

[0185] And / or, for each photovoltaic array, the capacity set is determined according to the corresponding upper limit value and lower limit value of the quantity, and the capacity set includes the photovoltaic array capacity when different numbers of photovoltaic devices are connected to the photovoltaic array.

[0186] Optionally, the photovoltaic arrays correspond one-to-one to the box transformers in the optimal box transformer combination, and the configuration module is specifically used to: determine the reference capacity of each photovoltaic array from the corresponding capacity set based on the total capacity of the area, with the goal of maximizing the number of photovoltaic arrays that fully connect the photovoltaic equipment.

[0187] Optionally, a splitting module is also included, which is used to: determine the single-watt concentration of each photovoltaic array based on the reference capacity, and determine the photovoltaic array with abnormal capacity among all the photovoltaic arrays based on the single-watt concentration based on preset judgment conditions; split the photovoltaic array with abnormal capacity until the photovoltaic array obtained by splitting meets the preset judgment conditions, and determine the number of split photovoltaic arrays and the capacity of each split photovoltaic array.

[0188] Optionally, the splitting module is specifically configured to: determine an average single-watt concentration of all the photovoltaic arrays based on the single-watt concentration; compare the single-watt concentration of each photovoltaic array with the average single-watt concentration of a preset multiple, and determine, based on the comparison result, that the photovoltaic array having the average single-watt concentration greater than the preset multiple is the photovoltaic array with abnormal capacity;

[0189] Alternatively, a normal distribution is made for the single-watt concentrations of all the photovoltaic arrays, and a preset proportion of the photovoltaic arrays are determined as the photovoltaic arrays with abnormal capacity in descending order of the single-watt concentrations according to the normal distribution;

[0190] Alternatively, a standard deviation is determined based on the single-watt concentration of all the photovoltaic arrays, and the standard deviation is compared with a preset threshold. If the standard deviation is greater than the preset threshold, a preset number of the photovoltaic arrays are determined as the photovoltaic arrays with abnormal capacity in descending order of the single-watt concentration.

[0191] Another embodiment of the present invention provides an electronic device, comprising a processor and a memory; the memory is used to store a computer program; and the processor is used to implement the photovoltaic array arrangement method described above when executing the computer program.

[0192] Yet another embodiment of the present invention provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the photovoltaic array arrangement method described above is implemented.

[0193] An electronic device that can serve as a server or client of the present invention will now be described, which is an example of a hardware device that can be applied to various aspects of the present invention. Electronic devices are intended to represent various forms of digital electronic computer devices, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. Electronic devices can also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices, and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or required herein.

[0194] An electronic device includes a computing unit that can perform various appropriate actions and processes based on a computer program stored in a read-only memory (ROM) or a computer program loaded from a storage unit into a random access memory (RAM). Various programs and data required for device operation can also be stored in the RAM. The computing unit, ROM, and RAM are connected to each other via a bus. An input / output (I / O) interface is also connected to the bus.

[0195] Computer systems may include clients and servers. A client and server are generally remote from each other and typically interact through a communication network. The client and server relationship arises through computer programs running on the respective computers and having a client-server relationship to each other.

[0196] Those skilled in the art will understand that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program. The program can be stored in a computer-readable storage medium. When the program is executed, it can include the processes of the embodiments of the above-mentioned methods. The storage medium can be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM). In this application, the units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the embodiments of the present invention. In addition, the functional units in the various embodiments of the present invention can be integrated into a processing unit, or each unit can exist physically separately, or two or more units can be integrated into a single unit. The above-mentioned integrated units can be implemented in the form of hardware or software functional units.

[0197] Although the present invention is disclosed as above, the scope of protection disclosed by the present invention is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications will fall within the scope of protection of the present invention.

Claims

1. A photovoltaic array arrangement method, characterized in that: include: Obtain the regional total capacity and maximum capacity ratio of the PV power station, as well as the maximum capacity of a single box-type transformer; Based on a first preset rule, determining an initial combination of box transformers in the photovoltaic power station according to the total capacity of the area, the maximum capacity ratio, and the maximum capacity of the box transformers, wherein the number of box transformers in the initial combination is not less than the minimum number of box transformers, and the capacity of each box transformer is the maximum capacity of the box transformer; Optimizing the number of box transformers in the initial box transformer combination and the capacity of each box transformer according to a second preset rule to determine an optimal box transformer combination, wherein the number of photovoltaic arrays in the photovoltaic power station is equal to the number of box transformers in the optimal box transformer combination, and the optimal box transformer combination needs to meet capacity requirements and have the lowest cost; Determining the quantity range of photovoltaic devices in each photovoltaic array according to the optimal box-type transformer combination, and determining the corresponding capacity set of the photovoltaic array according to each quantity range, wherein the photovoltaic devices include a combiner box and / or an inverter; Based on the principle that the number of photovoltaic arrays fully connected to the photovoltaic devices is the largest, the reference capacity of each photovoltaic array is determined according to the total capacity of the region and each capacity set.

2. The photovoltaic array arrangement method according to claim 1, characterized in that: The determining, based on the first preset rule and according to the total capacity of the region, the maximum capacity ratio, and the maximum capacity of the box transformers, of the initial combination of the box transformers in the photovoltaic power station includes: Determining the minimum total capacity of all the box transformers in the photovoltaic power station based on the total capacity of the area and the maximum capacity ratio, dividing the minimum total capacity of the box transformers by the maximum capacity of the box transformers, and rounding up the result of the division to obtain the minimum number of box transformers in the photovoltaic power station; The initial combination of box-type transformers is determined according to the minimum number of box-type transformers and the maximum capacity of the box-type transformers, wherein the number of box-type transformers in the initial combination of box-type transformers is determined according to the minimum number of box-type transformers.

3. The photovoltaic array arrangement method according to claim 1, characterized in that: The number of the initial combination of box-type transformers is at least one, and optimizing the number of box-type transformers in the initial combination of box-type transformers and the capacity of each box-type transformer according to a second preset rule to determine the optimal box-type transformer combination includes: If the number of pre-stored box transformer types is one, then determining the optimal box transformer combination from all box transformer combinations to be selected, wherein the corresponding box transformer combination to be selected includes all the initial box transformer combinations; If the number of the box transformer types is at least two, for each of the initial box transformer combinations, the box transformer type of at least one of the box transformers in the initial box transformer combination is replaced multiple times to obtain multiple replaced box transformer combinations; and the optimal box transformer combination is determined among all the box transformer combinations to be selected, wherein the corresponding box transformer combinations to be selected include all the initial box transformer combinations and the replaced box transformer combinations.

4. The photovoltaic array arrangement method according to claim 3, characterized in that: Determining the optimal box-type transformer combination among all candidate box-type transformer combinations includes: For each of the candidate box-type transformer combinations, cluster all brackets in the photovoltaic power station into a plurality of photovoltaic arrays according to the number of box-type transformers in the candidate box-type transformer combination, and determine the actual capacity of each photovoltaic array, wherein the photovoltaic arrays correspond one-to-one to the box-type transformers in the candidate box-type transformer combination; Determining a capacity reference value of each corresponding photovoltaic array according to the capacity of each box-type transformer in the to-be-selected box-type transformer combination and a preset capacity matching ratio, and matching the corresponding capacity reference value with the actual capacity; According to the matching results corresponding to each candidate box-type transformer combination, the candidate box-type transformer combination whose capacity reference value is closest to the corresponding actual capacity is determined as the optimal box-type transformer combination.

5. The photovoltaic array arrangement method according to claim 3, characterized in that: Determining the optimal box-type transformer combination among all candidate box-type transformer combinations includes: For each of the candidate box-type transformer combinations, calculating the sum of the number of box-type transformers in the candidate box-type transformer combination and the capacity of each box-type transformer; According to the calculation results corresponding to each of the candidate box-type transformer combinations, the candidate box-type transformer combination with the smallest sum of the number of box-type transformers and the capacity of each box-type transformer is determined as the optimal box-type transformer combination.

6. The photovoltaic array arrangement method according to any one of claims 1 to 5, characterized in that: The quantity range includes an upper quantity limit and a lower quantity limit, and the quantity range of photovoltaic devices in each photovoltaic array determined according to the optimal box-type transformer combination includes: For each of the box-type transformers in the optimal box-type transformer combination, determining the corresponding upper and lower capacity limits of the photovoltaic array according to the capacity of the box-type transformer and a preset capacity ratio range; Determine the upper limit of the number of photovoltaic devices by combining the upper limit of capacity and the predetermined rated capacity of a single photovoltaic device, and determine the lower limit of the number of photovoltaic devices by combining the lower limit of capacity and the rated capacity of a single photovoltaic device; and / or, Determining the corresponding capacity set of the photovoltaic array according to each of the quantity ranges includes: For each photovoltaic array, the capacity set is determined according to the corresponding upper limit value and lower limit value of the quantity, and the capacity set includes the photovoltaic array capacity when different numbers of photovoltaic devices are connected to the photovoltaic array.

7. The photovoltaic array arrangement method according to any one of claims 1 to 5, characterized in that: The photovoltaic arrays correspond one-to-one to the box-type transformers in the optimal box-type transformer combination, and determining the reference capacity of each photovoltaic array according to the total capacity of the region and each capacity set includes: With the goal of maximizing the number of photovoltaic arrays fully connected to the photovoltaic equipment, the reference capacity of each photovoltaic array is determined from the corresponding capacity set based on the total capacity of the region.

8. The photovoltaic array arrangement method according to any one of claims 1 to 5, characterized in that: After determining the reference capacity of each photovoltaic array according to the regional total capacity and each capacity set, the method further includes: Determining a single-watt concentration degree of each of the photovoltaic arrays according to the reference capacity, and determining a photovoltaic array with abnormal capacity among all the photovoltaic arrays according to the single-watt concentration degree based on a preset judgment condition; The photovoltaic array with abnormal capacity is split until the photovoltaic arrays obtained by splitting meet the preset judgment condition, and the number of the photovoltaic arrays after splitting and the capacity of each of the photovoltaic arrays after splitting are determined.

9. The photovoltaic array arrangement method according to claim 8, characterized in that: The photovoltaic array for determining capacity abnormality among all the photovoltaic arrays according to the single-watt concentration based on a preset judgment condition includes: Determining an average single-watt concentration of all the photovoltaic arrays according to the single-watt concentration; Comparing the single-watt concentration of each photovoltaic array with the average single-watt concentration of a preset multiple, and determining, based on the comparison result, the photovoltaic array having a single-watt concentration greater than the average single-watt concentration of the preset multiple as the photovoltaic array with abnormal capacity; or, Performing a normal distribution on the single-watt concentration of all the photovoltaic arrays, and determining a preset proportion of the photovoltaic arrays as the photovoltaic arrays with abnormal capacity in descending order of the single-watt concentration according to the normal distribution; or, A standard deviation is determined based on the single-watt concentration of all the photovoltaic arrays, and the standard deviation is compared with a preset threshold. If the standard deviation is greater than the preset threshold, a preset number of the photovoltaic arrays are determined as the photovoltaic arrays with abnormal capacity in descending order of the single-watt concentration.

10. A photovoltaic array arrangement device, characterized in that: include: The acquisition module is used to obtain the regional total capacity and maximum capacity ratio of the photovoltaic power station, as well as the maximum capacity of a single box transformer; An optimization module is configured to determine, based on a first preset rule, an initial combination of box transformers in the photovoltaic power station according to the total capacity of the area, the maximum capacity ratio, and the maximum capacity of the box transformers, wherein the number of box transformers in the initial combination of box transformers is not less than the minimum number of box transformers, and the capacity of each box transformer is the maximum capacity of the box transformer; and optimize the number of box transformers and the capacity of each box transformer in the initial combination of box transformers according to a second preset rule to determine an optimal box transformer combination, wherein the number of photovoltaic arrays in the photovoltaic power station is equal to the number of box transformers in the optimal box transformer combination, and the optimal box transformer combination needs to meet capacity requirements and have the lowest cost; a calculation module, configured to determine a quantity range of photovoltaic devices in each photovoltaic array according to the optimal box-type transformer combination, and determine a corresponding capacity set of the photovoltaic array according to each quantity range, wherein the photovoltaic devices include a combiner box and / or an inverter; A configuration module is configured to determine a reference capacity of each photovoltaic array according to the total capacity of the region and each capacity set based on the principle that the number of photovoltaic arrays fully connected to the photovoltaic equipment is the largest.

11. A computer-readable storage medium, characterized in that The storage medium stores a computer program, and when the computer program is executed by the processor, the photovoltaic array arrangement method according to any one of claims 1 to 9 is implemented.

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