Photovoltaic string design method based on historical meteorological data and related device

Abstract

The invention discloses a photovoltaic string design method based on historical meteorological data and a related device. The method comprises the following steps: acquiring historical meteorological data of a photovoltaic construction site, parameters of a photovoltaic module, parameters of a photovoltaic inverter, and a solar radiation temperature rise coefficient and a heat dissipation coefficient of the surface of a photovoltaic panel; according to historical meteorological data of a photovoltaic construction site, parameters of a photovoltaic module, parameters of a photovoltaic inverter, a solar radiation temperature rise coefficient and a heat dissipation coefficient of the surface of a photovoltaic panel, calculating actual output voltage of photovoltaic group strings, and calculating the minimum number of the photovoltaic group strings, the maximum MPPT number of the photovoltaic group strings and the maximum number of the photovoltaic group strings in each hour; and selecting the minimum number of the photovoltaic strings, the maximum MPPT number of the photovoltaic strings and the minimum value of the maximum number of the photovoltaic strings to obtain the number of the photovoltaic strings. According to the method, the historical meteorological data is fused in the photovoltaic string design, so that the string design value is more accurate, and the problem of deviation of the measured value of the traditional algorithm is solved.

Description

Technical Field

[0001] The present invention belongs to the field of new energy storage, and relates to a photovoltaic string design method based on historical meteorological data and related devices. Background Art

[0002] Photovoltaic power generation is recognized as the most promising new energy technology. Photovoltaic units convert the received solar energy into electrical energy, opening up a new path for the application of clean energy. However, in the design and construction of photovoltaic systems, how to reasonably determine the number of photovoltaic modules in series to ensure that the photovoltaic units work safely and efficiently is an issue worth considering. Photovoltaic units are composed of multiple photovoltaic modules in series, and the number of photovoltaic modules in series directly affects the output voltage of the photovoltaic unit. The photovoltaic unit has a maximum system voltage allowed to be carried, and the photovoltaic inverter has a maximum DC input voltage allowed to be carried. These two parameters are the key to ensuring the safe and stable operation of the photovoltaic system. How to reasonably determine the number of photovoltaic modules in series in the photovoltaic unit based on the above factors and achieve reasonable and efficient operation of the photovoltaic unit has become an important task.

[0003] At present, in the photovoltaic array, the electrical performance parameters of each photovoltaic module in the same photovoltaic module string are consistent. According to the requirements of the "Design Specifications for Photovoltaic Power Stations" (GB50797-2011), the number of photovoltaic modules in series should meet the following formula:

[0004]

[0005] Where: V dcmax Indicates the maximum DC input voltage allowed by the inverter (V), V mpptmin Indicates the minimum value of the inverter MPPT voltage (V), V mpptmax Indicates the maximum value of the inverter MPPT voltage (V), V oc Indicates the open circuit voltage of the photovoltaic module (V), V pm Indicates the working voltage of the photovoltaic module (V), K v Indicates the open circuit voltage temperature coefficient of the photovoltaic module, K v ′ represents the temperature coefficient of the working voltage of the photovoltaic module, t′ represents the maximum temperature limit of the photovoltaic module under working conditions (°C), t represents the minimum temperature limit of the photovoltaic module under working conditions (°C), and N represents the number of photovoltaic modules in series (N is rounded).

[0006] The definition of the ultimate minimum temperature t under the working conditions of photovoltaic modules is a complex issue that requires careful consideration. This parameter is not only affected by natural factors such as geographical location and climatic conditions, but is also closely related to the material properties, installation methods and working environment of photovoltaic modules. However, in actual situations, the range of the ultimate minimum temperature t under the working conditions of photovoltaic modules is defined very generally, especially in extreme weather conditions such as winter. The photovoltaic modules are still working at 5 pm, but the solar radiation at this time is very small, and the voltage value of the photovoltaic modules is low, which will cause the calculated value representing the number of photovoltaic modules in series to be too large and deviate from the normal value range. At the same time, the formula does not take into account the temperature rise of the photovoltaic panel itself due to different solar radiation, resulting in the lowest and highest temperatures being low during calculation, and the calculation results are inconsistent with the actual situation. Summary of the invention

[0007] The purpose of the present invention is to provide a photovoltaic string design method and related devices based on historical meteorological data to solve the problem of deviation between existing photovoltaic string design values ​​and actual values.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] A photovoltaic string design method based on historical meteorological data, comprising:

[0010] Obtain historical meteorological data of the photovoltaic construction site, parameters of photovoltaic modules, parameters of photovoltaic inverters, solar radiation temperature rise coefficient and heat dissipation coefficient of the photovoltaic panel surface;

[0011] According to the historical meteorological data of the photovoltaic construction site, the parameters of the photovoltaic modules, the parameters of the photovoltaic inverter, the solar radiation temperature rise coefficient and the heat dissipation coefficient of the photovoltaic panel surface, the actual output voltage of the photovoltaic strings is calculated, so as to calculate the minimum number of photovoltaic strings per hour, the maximum MPPT number of photovoltaic strings and the maximum number of photovoltaic strings;

[0012] The minimum value among the minimum number of photovoltaic strings, the maximum MPPT number of photovoltaic strings, and the maximum number of photovoltaic strings is selected to obtain the number of photovoltaic strings.

[0013] Furthermore, the historical meteorological data of the photovoltaic construction site includes average solar radiation, average temperature and average wind speed per hour.

[0014] Furthermore, the parameters of the photovoltaic module include the open circuit voltage of the photovoltaic module, the operating voltage of the photovoltaic module, the temperature coefficient of the open circuit voltage of the photovoltaic module, the temperature coefficient of the operating voltage of the photovoltaic module, the maximum limit temperature under the working conditions of the photovoltaic module, and the minimum limit temperature under the working conditions of the photovoltaic module.

[0015] Furthermore, the parameters of the photovoltaic inverter include an inverter MPPT start voltage and an inverter MPPT cut-off voltage.

[0016] Furthermore, the actual output voltage of the photovoltaic string is:

[0017] V=V pm ×G i / 1000×{[t i +A*G i *(1-B*F i )-25]×K′ v}

[0018] Among them, V pm Indicates the working voltage of the photovoltaic module, G i Indicates the amount of solar radiation, t i represents the ambient temperature, A represents the solar radiation temperature rise coefficient of the photovoltaic panel surface, B represents the heat dissipation coefficient, and F i Indicates wind speed, K v ′ represents the operating voltage temperature coefficient of the photovoltaic module.

[0019] Furthermore, the minimum number of photovoltaic strings is:

[0020]

[0021] Among them, V mpptmin Indicates the inverter MPPT starting voltage, V pm Indicates the working voltage of the photovoltaic module, G i Indicates the amount of solar radiation, t i represents the ambient temperature, A represents the solar radiation temperature rise coefficient of the photovoltaic panel surface, B represents the heat dissipation coefficient, and F i Indicates wind speed, K v ′ represents the temperature coefficient of the operating voltage of the photovoltaic module;

[0022] The maximum MPPT number of the photovoltaic string is:

[0023]

[0024] Among them, V mpptmax Indicates the inverter MPPT cut-off voltage, V mpp Indicates the inverter MPPT working voltage;

[0025] The maximum number of photovoltaic strings is:

[0026]

[0027] Among them, V dcmax Indicates the maximum DC input voltage, V ocIndicates the open circuit voltage of the PV module.

[0028] Furthermore, the number of photovoltaic strings is greater than the minimum number of photovoltaic strings and less than the minimum value of the maximum MPPT number of photovoltaic strings and the maximum number of photovoltaic strings.

[0029] A photovoltaic string design system based on historical meteorological data, comprising:

[0030] An acquisition module, which is used to acquire historical meteorological data of a photovoltaic construction site, parameters of photovoltaic modules, parameters of photovoltaic inverters, solar radiation temperature rise coefficient and heat dissipation coefficient of the photovoltaic panel surface;

[0031] A calculation module, which is used to calculate the actual output voltage of the photovoltaic strings according to the historical meteorological data of the photovoltaic construction site, the parameters of the photovoltaic modules, the parameters of the photovoltaic inverter, the solar radiation temperature rise coefficient and the heat dissipation coefficient of the photovoltaic panel surface, so as to calculate the minimum number of photovoltaic strings per hour, the maximum MPPT number of photovoltaic strings and the maximum number of photovoltaic strings;

[0032] The selection module is used to select the minimum value among the minimum number of photovoltaic strings, the maximum MPPT number of photovoltaic strings and the maximum number of photovoltaic strings to obtain the number of photovoltaic strings.

[0033] A terminal device comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the steps of the method are implemented when the processor executes the computer program.

[0034] A computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the method are implemented.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] The present invention provides a photovoltaic string design method based on historical meteorological data. By collecting historical meteorological data of the photovoltaic construction site, parameters of photovoltaic modules, parameters of photovoltaic inverters, solar radiation temperature rise coefficient and heat dissipation coefficient of the photovoltaic panel surface, the actual output voltage of the photovoltaic string is calculated, so as to select the minimum value of the minimum number of photovoltaic strings per hour, the maximum MPPT number of photovoltaic strings and the maximum number of photovoltaic strings, and obtain the number of photovoltaic strings. The method fully considers the influence of sunshine intensity on the power generation and heat generation of photovoltaic modules, and also considers the heat dissipation of photovoltaic modules themselves, which is closer to the actual use situation, and the obtained data is more accurate, which can reduce the power generation loss and investment loss caused by inverter mismatch. The present invention integrates historical weather data in the process of photovoltaic string design, and can obtain a more accurate number of photovoltaic strings. Compared with the existing calculation method, the accuracy is significantly improved, which solves the problem that the number of strings calculated by the traditional algorithm is low and inconsistent with the actual situation. The present invention can adjust the output voltage of the photovoltaic unit by accurately calculating the number of photovoltaic strings. The output voltage of the photovoltaic unit after the adjustment is more appropriate, which helps to improve the operating efficiency and stability of the photovoltaic power station and better meet the requirements of engineering design. It can then be vigorously promoted and used, and the power generation efficiency of the photovoltaic power station that is vigorously built can be further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0038] Figure 1 The figure is a flow chart of the photovoltaic string design method based on historical meteorological data of the present invention.

[0039] Figure 2 Schematic diagram of the structure of a photovoltaic string design system based on historical meteorological data in a preferred embodiment of the present invention.

[0040] Figure 3 It is a schematic diagram of the structure of an electronic device according to a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0042] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] The following is a description of exemplary embodiments of the present application in conjunction with the accompanying drawings, including various details of the embodiments of the present application to facilitate understanding, which should be considered as merely exemplary. Therefore, it should be recognized by those of ordinary skill in the art that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present application. Similarly, for the sake of clarity and conciseness, the description of well-known functions and structures is omitted in the following description.

[0044] Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of this application.

[0045] It should be noted that the terminals involved in the embodiments of the present application may include but are not limited to mobile phones, personal digital assistants (PDAs), wireless handheld devices, tablet computers, personal computers (PCs), MP3 players, MP4 players, wearable devices (for example, smart glasses, smart watches, smart bracelets, etc.), smart home devices and other smart devices.

[0046] In addition, the term "and / or" in this article is only a description of the association relationship between the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0047] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0048] See also Figure 1 The present invention provides a photovoltaic string design method based on historical meteorological data, which specifically includes the following steps:

[0049] Step 1: Obtain historical meteorological data of the photovoltaic construction site, parameters of photovoltaic modules, parameters of photovoltaic inverters, solar radiation temperature rise coefficient and heat dissipation coefficient of the photovoltaic panel surface.

[0050] Obtain historical meteorological data of the photovoltaic construction site through the local weather station or dedicated software, including the average solar radiation, average temperature and average wind speed per hour.

[0051] Consult the product manual to obtain the parameters of the photovoltaic module used, including the open circuit voltage V oc (V), photovoltaic module operating voltage V pm (V), open circuit voltage temperature coefficient of photovoltaic modules K v , PV module operating voltage temperature coefficient K v ′, the maximum temperature of the photovoltaic module under working conditions t′(℃), the minimum temperature of the photovoltaic module under working conditions t(℃).

[0052] Consult the product manual to obtain the parameters of the photovoltaic inverter used, including the inverter MPPT starting voltage V mpptmin (V), inverter MPPT cut-off voltage V mpptmax (V).

[0053] The solar radiation temperature rise coefficient A and heat dissipation coefficient B on the surface of the photovoltaic panel are calculated based on empirical values.

[0054] Step 2: Calculate the actual output voltage of the PV strings based on the historical meteorological data of the PV construction site, the parameters of the PV modules, the parameters of the PV inverter, the solar radiation temperature rise coefficient and the heat dissipation coefficient of the PV panel surface, and thus calculate the minimum number of PV strings per hour, the maximum MPPT number of PV strings and the maximum number of PV strings.

[0055] In a photovoltaic string, photovoltaic modules are connected to the inverter in series. There are N photovoltaic modules connected in series, so the output voltage of the photovoltaic string is the sum of the power generation voltages of N photovoltaic panels. i The photovoltaic panel can generate electricity only when the voltage is greater than 0, but only when the string output voltage is N×V pm Greater than the starting voltage V mpptmon The inverter can only work when the DC power from the photovoltaic panel is converted into AC power. pm Refers to the output voltage of the photovoltaic panel under the condition of sunshine radiation of 1000W / ㎡. When the sunshine radiation is less than 1000W / ㎡, the output voltage of the photovoltaic panel is proportional to the sunshine radiation. It can be calculated based on the average sunshine radiation value G per hour. i The actual output voltage of the photovoltaic panel during this period is obtained, which is V pm ×G i / 1000.

[0056] The characteristic of photovoltaic modules is that the output voltage is inversely proportional to the temperature of the module surface. The higher the module temperature, the lower the output voltage.pm It is the output voltage of the photovoltaic panel when the ambient temperature is 25℃. The actual ambient temperature of the photovoltaic panel when generating electricity will be different from 25℃. At the same time, the solar radiation will cause the temperature rise on the photovoltaic module itself, and its value is A*G i , A is the solar radiation temperature rise coefficient of the photovoltaic panel surface. At the same time, the photovoltaic panel itself will also emit heat, and the speed of heat dissipation is proportional to the wind speed. The heat dissipation value of the photovoltaic module is the temperature rise of the photovoltaic module due to solar radiation multiplied by the heat dissipation percentage, and the heat dissipation percentage is the heat dissipation coefficient B multiplied by the wind speed F i , so the heat dissipation value is A*G i *B*F i Therefore, the actual temperature rise generated by the photovoltaic module itself is the temperature rise minus the heat dissipation, and its value is A*G i *(1-B*F i ). Then the actual temperature of the PV panel surface is the ambient temperature t i Add the actual temperature rise, the value is: t i +A*G i *(1-B*F i ). To calculate the voltage change of the photovoltaic module at this temperature, the difference between the actual temperature and the standard test temperature of 25°C should be subtracted. During the period when the photovoltaic module is generating electricity, its actual output voltage is the working voltage V pm Multiply by the ratio of actual radiation to 1000W / ㎡, and then multiply by the working voltage temperature coefficient K of the photovoltaic module v ′, its value is:

[0057] V=V pm ×G i / 1000×{[t i +A*G i *(1-B*F i )-25]×K′ v}.

[0058] The output voltage of the PV string is the actual output voltage multiplied by the number of PV strings N. During the photovoltaic power generation period, the output voltage of the PV string must be greater than the inverter's starting voltage, so that the inverter can work and output power to the grid. Therefore, the minimum number of PV strings N during the photovoltaic power generation period is mpptmini is the starting voltage of the inverter V mpptmin Divided by the actual output voltage of the PV module, the value is:

[0059]

[0060] Minimum number of PV strings N mpptmini This is calculated every hour, giving 8760 numbers in a year. When the solar radiation is low, N mpptminiwill be very large. When the solar radiation reaches its peak, N mpptmini Therefore, we need to find N in 8760 hours per year. mpptmini The minimum value N mpptmin .

[0061] When the photovoltaic string is generating electricity, the output voltage cannot be greater than the maximum value of the inverter MPPT voltage V mpptmax Therefore, the maximum number of MPPTs N of PV strings during the PV power generation period is mpptmaxi The maximum MPPT voltage V mpptmax Divided by the actual output voltage of the PV module, the value is:

[0062]

[0063] Maximum number of MPPTs for PV strings N mpptmaxi This is calculated every hour, giving 8760 numbers in a year. When the solar radiation is low, N mpptmaxi will be very large. When the solar radiation reaches its peak, N mpptmaxi Therefore, we need to find N in 8760 hours per year. mpptmaxi The minimum value N mpptmax .

[0064] When the photovoltaic string is generating electricity, the output voltage cannot be greater than the maximum DC input voltage of the inverter. dcmax Therefore, the maximum number of PV strings N during the PV power generation period is maxi The maximum value of the DC input voltage is V dcmax Divided by the actual output voltage of the PV module, the value is:

[0065]

[0066] Maximum number of PV strings N maxi This is calculated every hour, giving 8760 numbers in a year. When the solar radiation is low, N maxi will be very large. When the solar radiation reaches its peak, N maxi Therefore, we need to find N in 8760 hours per year. maxi The minimum value N max .

[0067] Step 3: N mpptmini Find the minimum value N mppt,in , for N mpptmaxi Find the minimum value N mpptmax , for N maxi Find the minimum value N max , find the range of the number of PV panels connected in series.

[0068] Maximum number of MPPTs for PV strings N mpptmax and the maximum number of PV strings N max These are the maximum values ​​of the number of PV strings, and the minimum value needs to be taken.

[0069] The number of PV strings N must be greater than the minimum number of PV strings N mpptmin , but also less than the maximum number of MPPTs N of PV strings mpptmax and the maximum number of PV strings N max The minimum value in is:

[0070] N mpptmin ≤N≤min(N mpptmax , N max )

[0071] The number of photovoltaic strings calculated according to the method of the present invention fully considers the impact of sunlight intensity on the power generation and heat generation of photovoltaic modules, and also takes into account the heat dissipation of the photovoltaic modules themselves. It is closer to actual usage and the obtained data is more accurate, which can reduce the power generation loss and investment loss caused by inverter mismatch.

[0072] Another object of the present invention is to provide a photovoltaic string design system based on historical meteorological data, such as Figure 2 As shown, an embodiment of the system includes: an acquisition module, a calculation module and a selection module.

[0073] An acquisition module, which is used to acquire historical meteorological data of a photovoltaic construction site, parameters of photovoltaic modules, parameters of photovoltaic inverters, solar radiation temperature rise coefficient and heat dissipation coefficient of the photovoltaic panel surface;

[0074] A calculation module, which is used to calculate the actual output voltage of the photovoltaic strings according to the historical meteorological data of the photovoltaic construction site, the parameters of the photovoltaic modules, the parameters of the photovoltaic inverter, the solar radiation temperature rise coefficient and the heat dissipation coefficient of the photovoltaic panel surface, so as to calculate the minimum number of photovoltaic strings per hour, the maximum MPPT number of photovoltaic strings and the maximum number of photovoltaic strings;

[0075] The selection module is used to select the minimum value among the minimum number of photovoltaic strings, the maximum MPPT number of photovoltaic strings and the maximum number of photovoltaic strings to obtain the number of photovoltaic strings.

[0076] It can be understood that the photovoltaic string design system based on historical meteorological data provided by the present invention corresponds to the photovoltaic string design method based on historical meteorological data provided by the aforementioned embodiments. The relevant technical features of the photovoltaic string design system based on historical meteorological data can refer to the relevant technical features of the photovoltaic string design method based on historical meteorological data, which will not be repeated here.

[0077] The third object of the present invention is to provide an electronic device, such as Figure 3 As shown, it includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor executes the steps of the photovoltaic string design method based on historical meteorological data.

[0078] The photovoltaic string design method based on historical meteorological data comprises the following steps:

[0079] Obtain historical meteorological data of the photovoltaic construction site, parameters of photovoltaic modules, parameters of photovoltaic inverters, solar radiation temperature rise coefficient and heat dissipation coefficient of the photovoltaic panel surface;

[0080] According to the historical meteorological data of the photovoltaic construction site, the parameters of the photovoltaic modules, the parameters of the photovoltaic inverter, the solar radiation temperature rise coefficient and the heat dissipation coefficient of the photovoltaic panel surface, the actual output voltage of the photovoltaic strings is calculated, so as to calculate the minimum number of photovoltaic strings per hour, the maximum MPPT number of photovoltaic strings and the maximum number of photovoltaic strings;

[0081] The minimum value among the minimum number of photovoltaic strings, the maximum MPPT number of photovoltaic strings, and the maximum number of photovoltaic strings is selected to obtain the number of photovoltaic strings.

[0082] A fourth object of the present invention is to provide a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the photovoltaic string design method based on historical meteorological data are implemented.

[0083] The photovoltaic string design method based on historical meteorological data comprises the following steps:

[0084] Obtain historical meteorological data of the photovoltaic construction site, parameters of photovoltaic modules, parameters of photovoltaic inverters, solar radiation temperature rise coefficient and heat dissipation coefficient of the photovoltaic panel surface;

[0085] According to the historical meteorological data of the photovoltaic construction site, the parameters of the photovoltaic modules, the parameters of the photovoltaic inverter, the solar radiation temperature rise coefficient and the heat dissipation coefficient of the photovoltaic panel surface, the actual output voltage of the photovoltaic strings is calculated, so as to calculate the minimum number of photovoltaic strings per hour, the maximum MPPT number of photovoltaic strings and the maximum number of photovoltaic strings;

[0086] The minimum value among the minimum number of photovoltaic strings, the maximum MPPT number of photovoltaic strings, and the maximum number of photovoltaic strings is selected to obtain the number of photovoltaic strings.

[0087] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0088] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0089] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0090] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0091] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A photovoltaic string design method based on historical meteorological data, characterized in that: include: Obtain historical meteorological data of the photovoltaic construction site, parameters of photovoltaic modules, parameters of photovoltaic inverters, solar radiation temperature rise coefficient and heat dissipation coefficient of the photovoltaic panel surface; According to the historical meteorological data of the photovoltaic construction site, the parameters of the photovoltaic modules, the parameters of the photovoltaic inverter, the solar radiation temperature rise coefficient and the heat dissipation coefficient of the photovoltaic panel surface, the actual output voltage of the photovoltaic strings is calculated, so as to calculate the minimum number of photovoltaic strings per hour, the maximum MPPT number of photovoltaic strings and the maximum number of photovoltaic strings; The minimum value among the minimum number of photovoltaic strings, the maximum MPPT number of photovoltaic strings, and the maximum number of photovoltaic strings is selected to obtain the number of photovoltaic strings.

2. A photovoltaic string design method based on historical meteorological data according to claim 1, characterized in that: The historical meteorological data of the photovoltaic construction site includes the average sunshine radiation, average temperature and average wind speed per hour.

3. The photovoltaic string design method based on historical meteorological data according to claim 1, characterized in that: The parameters of the photovoltaic module include the open circuit voltage of the photovoltaic module, the operating voltage of the photovoltaic module, the temperature coefficient of the open circuit voltage of the photovoltaic module, the temperature coefficient of the operating voltage of the photovoltaic module, the maximum limit temperature under the working conditions of the photovoltaic module, and the minimum limit temperature under the working conditions of the photovoltaic module.

4. A photovoltaic string design method based on historical meteorological data according to claim 1, characterized in that: The parameters of the photovoltaic inverter include the inverter MPPT start voltage and the inverter MPPT cut-off voltage.

5. The photovoltaic string design method based on historical meteorological data according to claim 1, characterized in that: The actual output voltage of the photovoltaic string is: V=V pm ×G i / 1000×{[t i +A*G i *(1-B*F i )-25]×K′ v } Among them, V pm Indicates the working voltage of the photovoltaic module, G i Indicates the amount of sunlight radiation, t i represents the ambient temperature, A represents the solar radiation temperature rise coefficient of the photovoltaic panel surface, B represents the heat dissipation coefficient, and F i represents wind speed, K′ v Indicates the temperature coefficient of the operating voltage of the photovoltaic module.

6. The photovoltaic string design method based on historical meteorological data according to claim 1, characterized in that: The minimum number of photovoltaic strings is: Among them, V mpptmin Indicates the inverter MPPT starting voltage, V pm Indicates the working voltage of the photovoltaic module, G i Indicates the amount of sunlight radiation, t i represents the ambient temperature, A represents the solar radiation temperature rise coefficient of the photovoltaic panel surface, B represents the heat dissipation coefficient, and F i represents wind speed, K′ v Indicates the temperature coefficient of the operating voltage of the photovoltaic module; The maximum MPPT number of the photovoltaic string is: Among them, V mpptmax Indicates the inverter MPPT cut-off voltage, V mpp Indicates the inverter MPPT working voltage; The maximum number of photovoltaic strings is: Among them, V dcmax Indicates the maximum DC input voltage, V oc Indicates the open circuit voltage of the PV module.

7. The photovoltaic string design method based on historical meteorological data according to claim 1, characterized in that: The number of photovoltaic strings is greater than the minimum number of photovoltaic strings and less than the minimum value of the maximum MPPT number of photovoltaic strings and the maximum number of photovoltaic strings.

8. A photovoltaic string design system based on historical meteorological data, characterized in that: include: An acquisition module, which is used to acquire historical meteorological data of a photovoltaic construction site, parameters of photovoltaic modules, parameters of photovoltaic inverters, solar radiation temperature rise coefficient and heat dissipation coefficient of the photovoltaic panel surface; A calculation module, which is used to calculate the actual output voltage of the photovoltaic strings according to the historical meteorological data of the photovoltaic construction site, the parameters of the photovoltaic modules, the parameters of the photovoltaic inverter, the solar radiation temperature rise coefficient and the heat dissipation coefficient of the photovoltaic panel surface, so as to calculate the minimum number of photovoltaic strings per hour, the maximum MPPT number of photovoltaic strings and the maximum number of photovoltaic strings; The selection module is used to select the minimum value among the minimum number of photovoltaic strings, the maximum MPPT number of photovoltaic strings and the maximum number of photovoltaic strings to obtain the number of photovoltaic strings.

9. A terminal device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

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