Method, device, equipment, medium and product for determining number of photovoltaic modules connected in series

Abstract

The invention discloses a method, device and equipment for determining the number of photovoltaic modules connected in series, a medium and a product, and relates to the field of photovoltaic technologies. The method comprises the steps that a preset expression of the series connection number of photovoltaic modules is obtained, the preset expression is used for restraining the value range of the series connection number of the photovoltaic modules contained in a photovoltaic string connected with a preset inverter, correction is carried out according to the parameter value of at least one preset parameter in the preset expression, and the number of the photovoltaic modules in the preset inverter is obtained. The preset parameters are parameters related to the photovoltaic modules, and the target series connection number of the photovoltaic modules is determined according to the correction result and a preset expression. According to the technical scheme, when the series connection number of the photovoltaic modules contained in the photovoltaic group string connected with the inverter is determined, the parameter value of at least one parameter related to the photovoltaic modules in the preset expression is corrected, and then the target series connection number is determined according to the correction result and the preset expression; the number of series connection can be determined more accurately, and the design of the photovoltaic power station is optimized.

Description

Technical Field

[0001] The present invention relates to the field of photovoltaic technology, and in particular, to a method, device, equipment, storage medium and product for determining the number of series-connected photovoltaic modules. Background Art

[0002] A photovoltaic module is a combination of photovoltaic module sheets or different specifications of photovoltaic modules cut by a laser cutting machine or a wire cutting machine. It is the core part of a solar power generation system and is used to generate direct current using solar energy. The photovoltaic module is connected to the DC side of an inverter, and the inverter converts the direct current into alternating current to achieve power supply.

[0003] A photovoltaic module string (abbreviated as a photovoltaic string) is a circuit unit formed by connecting multiple photovoltaic modules in series. Calculating the number of series-connected photovoltaic modules in a photovoltaic string is one of the basic tasks in the design of a photovoltaic power station, which affects the general layout of the photovoltaic power station, the design of the support system, and the selection of the capacity ratio. To ensure that the photovoltaic power station can balance economy and safety, it is necessary to determine the number of photovoltaic modules connected in series on the DC side of the inverter. On the premise of the same installed capacity, if more photovoltaic modules can be connected in series in the photovoltaic string, it can not only save the engineering quantity of DC cables and the usage of photovoltaic brackets and pile foundations, but also improve the capacity ratio. As the number of series-connected photovoltaic modules increases, the voltage after series connection is increased, which can reduce the DC line loss and help improve the efficiency of the photovoltaic power generation system. In addition, due to the increase in voltage after series connection, the inverter startup time is advanced and the shutdown time is postponed, further increasing the power generation of the photovoltaic power station, which is of great significance for reducing the levelized cost of energy (LCOE) and improving the efficiency of the photovoltaic power station.

[0004] Currently, relevant calculation formulas such as the design code for photovoltaic power stations are generally used to calculate the number of series-connected photovoltaic modules, that is, assuming that under extreme environmental temperatures, the open-circuit voltage and maximum power point voltage of the photovoltaic string are the same as those of the photovoltaic string under standard test conditions (STC), and the number of series-connected photovoltaic modules in the photovoltaic string is calculated. The calculation results obtained by the existing solutions are on the conservative side and are difficult to meet the requirements of refined design. Summary of the Invention

[0005] The present invention provides a method, device, equipment, storage medium and product for determining the number of series-connected photovoltaic modules, which can more accurately determine the number of series-connected photovoltaic modules.

[0006] According to one aspect of the present invention, there is provided a method for determining the number of series-connected photovoltaic modules, including:

[0007] Obtain a preset expression for the number of series-connected photovoltaic modules, where the preset expression is used to constrain the value range of the number of series-connected photovoltaic modules included in a photovoltaic string connected to a preset inverter;

[0008] Modify the parameter value of at least one preset parameter in the preset expression, where the preset parameter is a parameter related to the photovoltaic module;

[0009] Determine the target number of series-connected photovoltaic modules according to the correction result and the preset expression.

[0010] According to another aspect of the present invention, there is provided a device for determining the number of series-connected photovoltaic modules, including:

[0011] An expression acquisition module, configured to obtain a preset expression for the number of series-connected photovoltaic modules, where the preset expression is used to constrain the value range of the number of series-connected photovoltaic modules included in a photovoltaic string connected to a preset inverter;

[0012] A parameter value correction module, configured to modify the parameter value of at least one preset parameter in the preset expression, where the preset parameter is a parameter related to the photovoltaic module;

[0013] A number determination module, configured to determine the target number of series-connected photovoltaic modules according to the correction result and the preset expression.

[0014] According to another aspect of the present invention, there is provided an electronic device, where the electronic device includes:

[0015] At least one processor; and

[0016] A memory communicatively connected to the at least one processor; where

[0017] The memory stores a computer program executable by the at least one processor, and when the computer program is executed by the at least one processor, the at least one processor is enabled to execute the method for determining the number of series-connected photovoltaic modules according to any embodiment of the present invention.

[0018] According to another aspect of the present invention, there is provided a computer-readable storage medium, where the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the method for determining the number of series-connected photovoltaic modules according to any embodiment of the present invention when executed.

[0019] According to another aspect of the present invention, there is provided a computer program product, where the computer program product includes a computer program, and when the computer program is executed by a processor, it implements the method for determining the number of series-connected photovoltaic modules according to any embodiment of the present invention.

[0020] In the scheme for determining the number of series-connected photovoltaic modules according to an embodiment of the present invention, a preset expression for the number of series-connected photovoltaic modules is obtained. The preset expression is used to constrain the value range of the number of series-connected photovoltaic modules included in a photovoltaic string connected to a preset inverter. The parameter value of at least one preset parameter in the preset expression is corrected, where the preset parameter is a parameter related to the photovoltaic module. The target number of series-connected photovoltaic modules is determined according to the correction result and the preset expression. By adopting the above technical solution, when determining the number of series-connected photovoltaic modules included in a photovoltaic string connected to an inverter, after correcting the parameter value of at least one parameter related to the photovoltaic module in the preset expression, the target number of series-connected modules is determined according to the correction result and the preset expression, so that the number of series-connected modules can be determined more accurately, and the design of the photovoltaic power station can be optimized.

[0021] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present invention, nor is it used to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention, and those of ordinary skill in the art can also obtain other drawings based on these drawings without creative efforts.

[0023] Figure 1 is a flowchart of a method for determining the number of series-connected photovoltaic modules according to an embodiment of the present invention;

[0024] Figure 2 is a flowchart of another method for determining the number of series-connected photovoltaic modules according to an embodiment of the present invention;

[0025] Figure 3 is a flowchart of yet another method for determining the number of series-connected photovoltaic modules according to an embodiment of the present invention;

[0026] Figure 4 is a flowchart of still another method for determining the number of series-connected photovoltaic modules according to an embodiment of the present invention;

[0027] Figure 5 is a schematic structural diagram of a device for determining the number of series-connected photovoltaic modules according to an embodiment of the present invention;

[0028] Figure 6 is a schematic structural diagram of an electronic device for implementing the method for determining the number of series-connected photovoltaic modules according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] To enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0030] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present invention described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0031] Figure 1 is a flowchart of a method for determining the number of series-connected photovoltaic modules according to an embodiment of the present invention. This embodiment is applicable to the situation of determining the number of series-connected photovoltaic modules in a photovoltaic string during the design process of a photovoltaic power station. This method can be executed by a device for determining the number of series-connected photovoltaic modules, and the device for determining the number of series-connected photovoltaic modules can be implemented in the form of hardware and / or software, and the device for determining the number of series-connected photovoltaic modules can be configured in an electronic device. As Figure 1 shown, the method includes:

[0032] Step 101, obtain a preset expression for the number of series-connected photovoltaic modules, where the preset expression is used to constrain the value range of the number of series-connected photovoltaic modules included in the photovoltaic string connected to a preset inverter.

[0033] Exemplarily, the number of series-connected modules to be determined is the number of photovoltaic modules connected in series in a photovoltaic string, and the photovoltaic string is usually connected to the DC side of an inverter. The preset inverter is the inverter to be connected. The preset expression is used to constrain the value range of the number of series-connected photovoltaic modules included in the photovoltaic string connected to the preset inverter, and the final actual number of series-connected photovoltaic modules can be determined within this value range, generally taking the largest integer within this value range.

[0034] In the related art, when designing a photovoltaic array of a photovoltaic power station, the number of series-connected photovoltaic modules is usually calculated according to specifications. In a photovoltaic array, the electrical performance parameters of each photovoltaic module in the same photovoltaic module string should preferably be kept consistent. The number of series-connected photovoltaic modules should be calculated according to the following formula:

[0035]

[0036] Among them, N represents the number of series-connected photovoltaic modules; V OC represents the open-circuit voltage value of the photovoltaic module; V pm represents the working voltage value of the photovoltaic module; V mpptmax represents the maximum voltage value of the inverter's maximum power point tracking (MPPT); V mpptmin represents the minimum voltage value of the inverter's MPPT; V dcmax represents the maximum DC input voltage value of the inverter; K V represents the open-circuit voltage temperature coefficient of the photovoltaic module, unit % / °C; K' V represents the working voltage temperature coefficient of the photovoltaic module, unit % / °C; t' represents the extreme high temperature value under the working conditions of the photovoltaic module; t represents the extreme low temperature value under the working conditions of the photovoltaic module.

[0037] There are at least the following problems in the above formula. The influence of different solar irradiances on the open-circuit voltage under working conditions is not considered; since the lowest operating temperature of the photovoltaic module under working conditions cannot be measured, in engineering design, the historical lowest temperature of the project location is generally used to replace the extreme low temperature of the photovoltaic module operation under the working conditions of the photovoltaic module. The lowest ambient temperature generally appears before sunrise, and the operating temperature of the photovoltaic module is generally higher than the ambient temperature, so the calculated number of series-connected photovoltaic modules is on the low side and the calculation result is on the conservative side.

[0038] Step 102: Modify the parameter values of at least one preset parameter in the preset expression, where the preset parameter is a parameter related to the photovoltaic module.

[0039] In the embodiments of the present disclosure, parameters related to the photovoltaic module (which can be understood as characteristic parameters of the photovoltaic module) can be modified, and the influence of wind speed on the parameters related to the photovoltaic module can be considered. The preset parameters can include, for example, the open-circuit voltage of the photovoltaic module, the working voltage of the photovoltaic module, the open-circuit voltage temperature coefficient of the photovoltaic module, the working voltage temperature coefficient of the photovoltaic module, the extreme high temperature value under the working conditions of the photovoltaic module, and the extreme low temperature value under the working conditions of the photovoltaic module.

[0040] For the convenience of distinguishing from the above formula, the preset expression can be:

[0041]

[0042] Among them, N represents the number of photovoltaic modules connected in series; V OC修正 represents the open-circuit voltage value of the photovoltaic module after correction; V pm修正 represents the working voltage value of the photovoltaic module after correction; K V修正 represents the temperature coefficient of the open-circuit voltage of the photovoltaic module after correction, with the unit of % / °C; K' V修正 represents the temperature coefficient of the working voltage of the photovoltaic module after correction, with the unit of % / °C; t' 修正 represents the maximum high temperature value under the working conditions of the photovoltaic module after correction; t 修正 represents the minimum low temperature value under the working conditions of the photovoltaic module after correction.

[0043] The parameter values of the characteristic parameters of the photovoltaic module may change with the environment where the photovoltaic module is located, such as irradiance, temperature, and wind speed. The embodiments of the present invention can correct for at least one of the above-mentioned influencing wind speeds. Each correction value in the above expressions (1) and (2) can be one or more. The parameter values of the uncorrected parameters can be the same as the values in the formulas in the related technologies described above.

[0044] Step 103: Determine the target number of photovoltaic modules connected in series according to the correction result and the preset expression.

[0045] Exemplarily, the target number of modules connected in series can be understood as the optimal design number of the finally determined photovoltaic modules. The correction result includes the corrected parameter values of the preset parameters that have been corrected. Substitute the corrected parameter values into the preset expression to determine the value range of the number of modules connected in series, and the largest integer value within this value range can be taken as the target number of modules connected in series.

[0046] For the method for determining the number of photovoltaic modules connected in series according to the embodiments of the present invention, a preset expression for the number of photovoltaic modules connected in series is obtained. Among them, the preset expression is used to constrain the value range of the number of photovoltaic modules connected in series included in the photovoltaic string connected to the preset inverter. The parameter values of at least one of the preset parameters in the preset expression are corrected. The preset parameters are parameters related to the photovoltaic module. The target number of photovoltaic modules connected in series is determined according to the correction result and the preset expression. By adopting the above technical solution, when determining the number of photovoltaic modules connected in series included in the photovoltaic string connected to the inverter, after correcting the parameter values of at least one parameter related to the photovoltaic module in the preset expression, and then determining the target number of modules connected in series according to the correction result and the preset expression, the number of modules connected in series can be determined more accurately, optimizing the design of the photovoltaic power station.

[0047] In some embodiments, for one or more of at least one preset parameter, the influence of the wind speed can be considered and the parameter values can be corrected accordingly. Optionally, the method further includes: obtaining wind speed data of the working environment where the photovoltaic module is located; wherein, correcting the parameter value of at least one preset parameter in the preset expression includes: correcting the parameter value of one or more of at least one preset parameter in the preset expression according to the wind speed data. Thus, when determining the number of series-connected photovoltaic modules included in a photovoltaic string connected to an inverter, fully considering the influence of the wind speed in the working environment where the photovoltaic module is located can more accurately determine the number of series connections, optimize the design of the photovoltaic power station. After considering the wind speed, generally the number of series connections can be increased, the number of required junction boxes is reduced, the designed installed capacity of the photovoltaic power station is increased, the length of the cables required for parallel connection between strings is correspondingly reduced, the line loss is reduced, the power generation is increased, which helps to improve the efficiency of the photovoltaic power generation system.

[0048] In the embodiments of the present invention, the working environment where the photovoltaic module is located can be the working environment of the photovoltaic module pre-determined during the relevant design process of the photovoltaic power station. After the photovoltaic module is actually installed, the photovoltaic module should work in this working environment. The working environment where the photovoltaic module is located can also be the actual working environment after the photovoltaic module is installed, which is applicable to the case of dynamically adjusting the number of series connections after the photovoltaic module is installed. The wind speed data can be measured by a wind speed measuring device, and the specific measuring position is not limited. For example, it can be the wind speed measured within a preset position range (such as within 1 meter around) of the photovoltaic module, or the wind speed measured at a preset height (such as 10 meters) from the ground, and can be selected according to the actual measurement conditions. Generally, the measurement position closer to the photovoltaic module is preferably selected. Optionally, when the measurement conditions are poor, the wind speed within the preset position range of the photovoltaic module can be obtained by conversion formula.

[0049] Figure 2 is a flowchart of another method for determining the number of series-connected photovoltaic modules according to an embodiment of the present invention. This embodiment is optimized on the basis of the above optional embodiments. At least one preset parameter includes the open-circuit voltage of the photovoltaic module, that is, correcting the parameter value of the open-circuit voltage of the photovoltaic module in the preset expression according to the wind speed data. As Figure 2 shown, the method includes:

[0050] Step 201, obtain the wind speed data of the working environment where the photovoltaic module is located, and obtain the preset expression of the number of series-connected photovoltaic modules.

[0051] Step 202, correct the operating temperature of the photovoltaic module according to the wind speed data to obtain a corrected operating temperature value.

[0052] Exemplarily, the open-circuit voltage can be expressed by the following expression:

[0053] V oc = V ocsta [1 - c(T - T ref )]·ln[e + b(G - G ref )] (3)

[0054] Among them, V ocsta is the open - circuit voltage of the photovoltaic module under STC; both b and c are calculation constants, where b = 0.0005 and c = 0.00288; T ref is the operating temperature of the photovoltaic module under STC, taking 25; e is the natural constant; G ref is the solar irradiance under STC, with the unit kW / m², taking 1; G represents the given solar irradiance; T represents the operating temperature of the photovoltaic module.

[0055] It can be seen from the above expression (3) that the open - circuit voltage of the photovoltaic module is related to the operating temperature of the photovoltaic module. In the embodiments of the present invention, the influence of wind speed on the operating temperature can be considered, so as to correct the operating temperature value, and further correct the open - circuit voltage value.

[0056] In the embodiments of the present invention, the specific manner of correcting the operating temperature is not limited.

[0057] Optionally, correcting the operating temperature of the photovoltaic module according to the wind speed data to obtain a corrected operating temperature value includes: determining a corresponding target wind speed correction coefficient according to the wind speed data and a preset wind speed correction function; calculating the quotient of the nominal wind speed correction coefficient and the target wind speed correction coefficient to obtain a wind speed correction amount, where the nominal wind speed correction coefficient is determined according to the nominal wind speed and the preset wind speed correction function; substituting the wind speed correction amount into the operating temperature expression of the photovoltaic module under the nominal wind speed condition to obtain a corrected operating temperature value. Thus, the corrected operating temperature value can be accurately determined.

[0058] Among them, the operating temperature of the photovoltaic module under the nominal wind speed condition can be determined by the following expression, and this expression can be denoted as the operating temperature expression of the photovoltaic module under the nominal wind speed condition:

[0059]

[0060] Among them, T a is the ambient temperature; G is the plane irradiance, that is, the given solar irradiance; T NOCT is the nominal working cell temperature, that is, the nominal photovoltaic module operating temperature. Under standard test conditions, G NOCT = 800W / m², T a,NOCT = 20°C, and under a wind speed of 1m / s, T NOCTIt can be 45°C. The specific value-taking method can be referred to Table 1 below, such as NOCT(°C) in Table 1; η STC and β STC are the battery efficiency coefficient and temperature coefficient under standard test conditions respectively. Under standard test conditions, the irradiance is 1000 W / m2, T STC = 25°C and the air mass (AM) = 1.5. See Table 1 below for details; τ is the transmittance; α is the absorption coefficient; the value of τα is usually taken as 0.9.

[0061] Table 1 Parameter value tables for different photovoltaic (PV) technologies

[0062]

[0063] Exemplarily, the wind speed correction coefficient is a coefficient related to the wind speed. The preset wind speed correction function can be expressed as: wind speed correction coefficient = k1 + k2 * wind speed. Optionally, the relationship between the wind speed correction coefficient and the wind speed can be determined based on a large amount of test data, that is, the values of the first coefficient k1 and the second coefficient k2 in the above expression are determined to obtain the preset wind speed correction function.

[0064] Exemplarily, it is assumed that the measured wind speed data is the wind speed v measured at a position at a preset height from the ground (such as 10 meters) f , and the wind speed correction coefficient is denoted as h w , and we can get:

[0065] h w = 8.91 + 2.00v f (5)

[0066] Exemplarily, it is assumed that the measured wind speed data is the wind speed v measured within a preset position range (such as within 1 meter around) of the photovoltaic module w , and the wind speed correction coefficient is denoted as h w , and we can get:

[0067] h w = 5.7 + 2.8v w (6)

[0068] Exemplarily, the closer the measurement position of the wind speed is to the photovoltaic module, the better the correction effect. When the measurement conditions are poor, v w and v f can also be determined according to the conversion relationship between them to obtain v w , which can be expressed as: v w = k3 * v f + k4, and the values of the third coefficient k3 and the fourth coefficient k4 in this expression can be determined based on a large amount of test data. For example, we can get:

[0069] vw = 0.68v f -0.5(7)

[0070] Exemplarily, denote the wind speed correction coefficient under nominal conditions (v w = 1 m / s) as the nominal wind speed correction coefficient h w，NOCT , substitute v w = 1 m / s into the above expression (6), and the specific value of the nominal wind speed correction coefficient can be obtained.

[0071] Exemplarily, after obtaining the wind speed data, the wind speed data can be substituted into the above expression (6) or (5), or the above expression (7) can be used for conversion to obtain v w , and then substitute it into the above expression (6) to obtain the wind speed correction coefficient corresponding to the wind speed data, denoted as the target wind speed correction coefficient h w (v).

[0072] Calculate the quotient of the nominal wind speed correction coefficient and the target wind speed correction coefficient to obtain the wind speed correction amount, that is, h w，NOCT / h w (v), and then substitute the wind speed correction amount into the operating temperature expression under the nominal wind speed of the photovoltaic module. The substitution method is to multiply the term containing the plane irradiance in the operating temperature expression, and the corrected operating temperature value can be obtained.

[0073] Exemplarily, denote the corrected operating temperature value as T c , and it can be calculated through the following expression:

[0074]

[0075] It should be noted that there may be other ways to correct the operating temperature.

[0076] Optionally, the corrected operating temperature value can be determined through the following expression:

[0077] T c = t m + G PV / 1000 * d (9)

[0078] where, t m = G PV e (a+b·WS) + t a ; T c is the actual working temperature of the photovoltaic module, that is, the corrected operating temperature value, unit °C; t m is the actual working temperature of the backplane of the photovoltaic module, unit °C; t a is the ambient temperature, unit °C, and the local extreme minimum ambient temperature value can be taken; G PVG is the solar irradiance received by the photovoltaic array, in units of W / m2; WS is the wind speed at a height of 10 m, in units of m / s, and local meteorological data can be referred to; a, b, and d are all relevant empirical coefficients. Among them, due to different forms of photovoltaic modules and installation methods, the values of a, b, and d can be different. For example, when the form of the photovoltaic module is glass-solar cell-glass and the installation method is an open bracket, a is -3.47, b is -0.0594 (in units of s / m), and d is 3 (in units of °C); when the form of the photovoltaic module is glass-solar cell-glass and the installation method is near-roof installation, a is -2.98, b is -0.0471, and d is 1; when the form of the photovoltaic module is glass-solar cell-polymer film and the installation method is an open bracket, a is -3.56, b is -0.0750, and d is 3; when the form of the photovoltaic module is glass-solar cell-polymer film and the installation method is back insulation, a is -2.81, b is -0.0455, and d is 0; when the form of the photovoltaic module is polymer-film-steel and the installation method is an open bracket, a is -3.58, b is -0.113, and d is 3.

[0079] Step 203: Determine the corrected open-circuit voltage value of the open-circuit voltage of the photovoltaic module according to the corrected operating temperature value.

[0080] Exemplarily, after determining the corrected operating temperature value, the corrected operating temperature value can be substituted into Expression (3) to obtain the corrected open-circuit voltage value V of the open-circuit voltage of the photovoltaic module. OC修正 。

[0081] Step 204: Determine the target series number of the photovoltaic module according to the correction result and a preset expression, where the correction result includes the corrected open-circuit voltage value.

[0082] Exemplarily, assume that the correction result only includes V OC修正 , then substitute it into the above Expression (1) to solve the first value range of N, and then determine the second value range of N according to Expression (2). Determine the target value range of N according to the union of the first value range and the second value range, and take the largest integer within the target value range to obtain the target series number.

[0083] The photovoltaic module series connection number determination solution provided by the embodiment of the present invention obtains the wind speed data of the working environment where the photovoltaic module is located, first corrects the operating temperature of the photovoltaic module according to the wind speed data to obtain a corrected operating temperature value, then corrects the parameter value of the open-circuit voltage of the photovoltaic module in the preset expression according to the corrected operating temperature value, and finally determines the target series connection number of the photovoltaic module according to the correction result and the preset expression. By adopting the above technical solution, when determining the series connection number of the photovoltaic modules included in the photovoltaic string connected to the inverter, the influence of the wind speed in the working environment where the photovoltaic module is located on the working temperature of the photovoltaic module is fully considered, the series connection number can be determined more accurately, the design of the photovoltaic power station can be further optimized, and the efficiency of the photovoltaic power generation system can be improved.

[0084] In some embodiments, the at least one preset parameter includes the limit low temperature under the working conditions of the photovoltaic module. The method further includes: obtaining the wind speed data of the working environment where the photovoltaic module is located; the correcting the parameter value of at least one preset parameter in the preset expression includes: correcting the parameter value of the limit low temperature under the working conditions of the photovoltaic module according to the wind speed data.

[0085] Since it is difficult to obtain the extreme low temperature value under the working conditions of the photovoltaic module, in the current engineering design practice, the extreme low temperature value generally takes the extreme lowest ambient temperature of the location of the photovoltaic power generation project. However, in the related art, the influence of the wind speed around the photovoltaic module on the extreme low temperature value is not considered. In the embodiment of the present invention, the influence of the wind speed on the limit low temperature where the photovoltaic module is located is fully considered and corrected by using the wind speed, so as to avoid the inaccuracy of the determined series connection number caused by the inconsistent limit low temperature participating in the calculation and the lowest temperature in the actual working process of the photovoltaic module, and further improve the accuracy of the determined series connection number.

[0086] Figure 3 It is a flowchart of another photovoltaic module series connection number determination method provided by the embodiment of the present invention. This embodiment is optimized on the basis of the above optional embodiments. The at least one preset parameter includes the limit low temperature under the working conditions of the photovoltaic module, that is, the parameter value of the limit low temperature under the working conditions of the photovoltaic module in the preset expression is corrected according to the wind speed data. As Figure 3 shown, the method includes:

[0087] Step 301, obtain the wind speed data of the working environment where the photovoltaic module is located, and obtain the preset expression for the series connection number of the photovoltaic module.

[0088] Step 302, determine the corresponding target temperature deviation according to the wind speed data and the preset temperature deviation function, where the preset temperature deviation function is obtained by fitting the meteorological data in the preset historical period of the area where the photovoltaic module is located.

[0089] Exemplarily, the preset temperature deviation function can be expressed as ΔT wind = F(v), where F is a functional relationship, and this function can be a linearly related or non-linearly related function, which can be obtained by fitting the meteorological data within a preset historical period (such as the most recent year, etc., which can be set according to actual needs) in the area where the photovoltaic module is located. ΔT wind is the temperature deviation, which can characterize the surface temperature fluctuation deviation, v is the wind speed, and the value can be the v mentioned above w . Substituting the wind speed data into the preset temperature deviation function, the target temperature deviation corresponding to the wind speed data can be obtained, which can be understood as the fluctuation value of the surface temperature that can be caused by the current wind speed.

[0090] Step 303: Correct the preset limit low temperature under the working conditions of the photovoltaic module according to the target temperature deviation to obtain the corrected temperature value of the limit low temperature under the working conditions of the photovoltaic module.

[0091] In the embodiment of the present invention, the preset limit low temperature under the working conditions of the photovoltaic module can be determined by a traditional method, such as taking the extreme minimum ambient temperature at the location of the photovoltaic power generation project, or other methods can also be used.

[0092] The extreme minimum ambient temperature usually appears in the early morning, and at this time the photovoltaic module is not in a working state. The photovoltaic module only starts to work when there is sunlight, and the working temperature of the photovoltaic module will increase with the increase of solar irradiance. If the value of the preset limit low temperature is taken as the extreme minimum air temperature at the project location, it may lead to inaccuracy, because in fact the extreme low temperature should be the extreme low temperature of the photovoltaic module under the working conditions, that is, the lowest temperature of the photovoltaic module when there is light. Under the working conditions of the photovoltaic module, when sunlight shines on the photovoltaic module, the junction temperature will immediately increase and increase with the increase of irradiance. Therefore, when directly calculating by taking the extreme low temperature of the whole day in the calculation, the limit low temperature value will be on the low side. Because the meteorological limit low temperature will appear at night on the meteorological limit low temperature day, and the photovoltaic module is in a non-working state at night, so the limit low temperature under the working conditions of the photovoltaic module should appear in the early morning of the next day of the meteorological limit low temperature day, that is, the limit low temperature under the working conditions of the photovoltaic module should adopt the ambient temperature at the starting moment of the inverter on the next day.

[0093] Optionally, the preset limit low temperature under the working conditions of the photovoltaic module is the theoretical surface temperature at the starting moment of the preset inverter. This step may specifically include: calculating the sum of the target temperature deviation and the theoretical surface temperature at the starting moment of the preset inverter to obtain the corrected temperature value of the limit low temperature under the working conditions of the photovoltaic module.

[0094] Among them, the preset limit low temperature can be determined based on an ambient temperature model, and the ambient temperature model is expressed by the following expression:

[0095]

[0096] Among them, T S represents the theoretical ground surface temperature; T0 represents the ground surface temperature at sunrise; T a represents the change range of the ground surface temperature in a day-night cycle; ω is the sunshine duration, representing the length of the time period between sunrise and sunset; t m is the moment of the highest ground surface temperature in the day-night cycle; t s is the starting moment when the ground surface temperature decays exponentially; δT is the difference between T0 and T(t→∞); k is the decay coefficient.

[0097] Among them, k can be calculated by the following expression:

[0098]

[0099] Among them, T0, T involved in Expression (10) and Expression (11) a , t m and t s can be obtained by combining local meteorological data.

[0100] Exemplarily, to determine the inverter startup moment, that is, t in Expression (10), according to Expression (10) and Expression (11), obtain the theoretical ground surface temperature T S at the inverter startup moment t, and calculate the sum of △T wind and T S to obtain the corrected temperature value t 修正 under the working conditions of the photovoltaic module.

[0101] Step 304: Determine the target series number of the photovoltaic module according to the correction result and the preset expression, where the correction result includes the corrected temperature value.

[0102] Exemplarily, after obtaining the corrected temperature value t 修正 corresponding to the extreme low temperature under the working conditions of the photovoltaic module, substitute t 修正 into Expression (1) and Expression (2), and further determine the target series number of the photovoltaic module.

[0103] The photovoltaic module series connection number determination solution provided by the embodiments of the present invention obtains the wind speed data of the working environment where the photovoltaic modules are located. First, according to the wind speed data and a preset temperature deviation function, the corresponding target temperature deviation is determined. Then, the preset extreme low temperature under the working conditions of the photovoltaic modules is corrected by using the target temperature deviation to obtain a corrected temperature value. Finally, the target series connection number of the photovoltaic modules is determined according to the corrected temperature value and a preset expression. By adopting the above technical solution, when determining the series connection number of the photovoltaic modules included in the photovoltaic string connected to the inverter, the influence of the wind speed in the working environment where the photovoltaic modules are located on the extreme low temperature under the working conditions of the photovoltaic modules is fully considered, so that the series connection number can be determined more accurately, the design of the photovoltaic power station can be further optimized, and the efficiency of the photovoltaic power generation system can be improved.

[0104] In some embodiments, at least one preset parameter includes the open circuit voltage of the photovoltaic module and the extreme low temperature under the working conditions of the photovoltaic module. That is, by fully considering the influence of the wind speed on both the open circuit voltage and the extreme low temperature at the same time, the series connection number can be determined more accurately.

[0105] Figure 4 It is a flowchart of another method for determining the series connection number of photovoltaic modules according to the embodiments of the present invention. This embodiment is optimized on the basis of the above optional embodiments. At least one preset parameter includes the open circuit voltage of the photovoltaic module and the extreme low temperature under the working conditions of the photovoltaic module. That is, the parameter values of the open circuit voltage of the photovoltaic module and the extreme low temperature under the working conditions of the photovoltaic module in the preset expression are corrected according to the wind speed data, so that the series connection number can be determined more accurately. As Figure 4 shown, the method includes:

[0106] Step 401, obtain the wind speed data of the working environment where the photovoltaic modules are located, and obtain the preset expression for the series connection number of the photovoltaic modules.

[0107] Exemplarily, assume that the relevant parameters of the photovoltaic modules are shown in Table 2 below, and the relevant parameters of the inverter are shown in Table 3 below:

[0108] Table 2, Relevant parameters of photovoltaic modules

[0109]

[0110] Table 3, Relevant parameters of the inverter

[0111]

[0112] Using the data without correction in the related technology for calculation, N <= 21.84 and 17.3 <= N <= 23.5 can be obtained respectively. After taking the intersection, 17.3 <= N <= 21.84 before correction can be obtained. Taking the largest integer of N, so N is 21.

[0113] In the embodiment of the present invention, first determine the wind speed near the photovoltaic module, and assume that v w = 5 m / s.

[0114] Step 402: Determine the corresponding target wind speed correction coefficient according to the wind speed data and the preset wind speed correction function.

[0115] Exemplarily, according to the expression (6) in the foregoing text, h w (v) = h w (5 m / s) can be calculated. According to the expression (6), h w，NOCT = h w (1 m / s) can also be calculated.

[0116] Step 403: Calculate the quotient of the nominal wind speed correction coefficient and the target wind speed correction coefficient to obtain the wind speed correction amount. The nominal wind speed correction coefficient is determined according to the nominal wind speed and the preset wind speed correction function.

[0117] Step 404: Substitute the wind speed correction amount into the operating temperature expression of the photovoltaic module under the nominal wind speed to obtain the corrected operating temperature value.

[0118] With a plane irradiance of 500 w / m2 and an ambient temperature of 283.13 K, according to the parameters of polysilicon in Table 1, the following Table 4 is obtained:

[0119] Table 4: Parameter Table for Operating Temperature Calculation

[0120]

[0121] According to the data in Table 4 above, T c = 329.55 K can be calculated using the expression (8).

[0122] Step 405: Determine the corrected open-circuit voltage value of the open-circuit voltage of the photovoltaic module according to the corrected operating temperature value.

[0123] Exemplarily, the relevant parameters for calculating the open-circuit voltage are as follows in Table 5:

[0124] Table 5: Parameter Table for Open-Circuit Voltage Calculation

[0125]

[0126] Among them, the operating temperature T of the photovoltaic module takes the value of T c , and according to the data in Table 5 above, V OC修正 = 30.19 V can be calculated using the expression (3).

[0127] Step 406: Determine the corresponding target temperature deviation according to the wind speed data and a preset temperature deviation function, where the preset temperature deviation function is obtained by fitting meteorological data within a preset historical period in the area where the photovoltaic module is located.

[0128] Exemplarily, a preset temperature deviation function is obtained by fitting the collected wind speed and corresponding temperature change data. Suppose the collected data is as shown in Table 6 below:

[0129] Table 6. Wind speed and temperature change data

[0130]

[0131] According to the data in Table 6 above, the preset temperature deviation function can be obtained by fitting as follows:

[0132] △T wind =-0.5186*v w +0.6051

[0133] Substitute v w =5m / s into the preset temperature deviation function, and the corresponding target temperature deviation △T can be calculated wind =-1.98 degrees.

[0134] Step 407: Calculate the sum of the target temperature deviation and the theoretical ground surface temperature at the starting moment of the preset inverter to obtain the corrected temperature value of the limit low temperature under the working conditions of the photovoltaic module.

[0135] Exemplarily, suppose the starting moment of the preset inverter is 7:30 in the morning, and the parameters required for the above expression (10) are as shown in Table 7:

[0136] Table 7. Parameter table for calculating the theoretical ground surface temperature

[0137] City Field Forest <![CDATA[T0 (degrees Celsius)]]> 6.6 3.7 3.9 <![CDATA[T a (degrees Celsius)]]> 20.8 22.9 18 ω (hh:mm) 13:56 13:54 13:53 <![CDATA[t m (hh:mm)]]> 12:53 12:39 12:13 <![CDATA[t s (hh:mm)]]> 17:07 17:04 17:02 k (hh:mm) 3:21 2:38 1:44 δT (degrees Celsius) -0.8 0.9 2

[0138] As shown in Table 7 above, taking a city as an example for calculation, the theoretical ground surface temperature T at the starting moment of the preset inverter can be obtained S =13.44 degrees.

[0139] The corrected temperature value t 修正 =13.44 degrees + (-1.98 degrees) = 11.46 degrees.

[0140] Step 408: Determine the target series number of the photovoltaic module according to the correction result and a preset expression, where the correction result includes a corrected open-circuit voltage value and a corrected temperature value.

[0141] Exemplarily, substitute V OC修正 and t 修正Substituting into Expression (1) and Expression (2), we can respectively obtain N <= 26.56 and 17.37 <= N <= 27.5. Taking the intersection of the two, the range of the corrected N value is 17.37 <= N <= 26.56. Taking the largest positive integer N = 26, compared with 21 calculated in the uncorrected case, the number of series connections increases by 5.

[0142] The method for determining the number of series connections of photovoltaic modules provided by the embodiments of the present invention obtains the wind speed data of the working environment where the photovoltaic modules are located, corrects both the open-circuit voltage of the photovoltaic modules and the parameter values of the extreme low temperature under the working conditions of the photovoltaic modules in a preset expression according to the wind speed data, and determines the target number of series connections of the photovoltaic modules according to the correction result and the preset expression. By adopting the above technical solution, on the premise of meeting the MPPT voltage and the maximum open-circuit voltage, the number of series connections is increased. In this way, the more the number of series connections, the fewer the number of required busbar boxes, the corresponding reduction in the cable length required for parallel connection between strings, the reduction of investment, the reduction of line loss, the increase in power generation, and it helps to improve the efficiency of the photovoltaic power generation system.

[0143] Figure 5 It is a schematic structural diagram of a device for determining the number of series connections of photovoltaic modules according to an embodiment of the present invention. As Figure 5 shown, the device includes:

[0144] An expression acquisition module 501, configured to acquire a preset expression for the number of series connections of photovoltaic modules, where the preset expression is used to restrict the value range of the number of series connections of the photovoltaic modules included in a photovoltaic string connected to a preset inverter;

[0145] A parameter value correction module 502, configured to correct the parameter values of at least one preset parameter in the preset expression, where the preset parameter is a parameter related to the photovoltaic module;

[0146] A number determination module 503, configured to determine the target number of series connections of the photovoltaic modules according to the correction result and the preset expression.

[0147] The photovoltaic module series connection number determination device according to an embodiment of the present invention obtains a preset expression for the series connection number of photovoltaic modules, where the preset expression is used to restrict the value range of the series connection number of photovoltaic modules included in a photovoltaic string connected to a preset inverter. The parameter value of at least one preset parameter in the preset expression is corrected, and the preset parameter is a parameter related to the photovoltaic module. The target series connection number of the photovoltaic module is determined according to the correction result and the preset expression. By adopting the above technical solution, when determining the series connection number of photovoltaic modules included in a photovoltaic string connected to an inverter, after correcting the parameter value of at least one parameter related to the photovoltaic module in the preset expression, the target series connection number is determined according to the correction result and the preset expression, so that the series connection number can be determined more accurately, and the design of the photovoltaic power station can be optimized.

[0148] Optionally, the at least one preset parameter includes the open-circuit voltage of the photovoltaic module; the device further includes: a wind speed data acquisition module for acquiring the wind speed data of the working environment where the photovoltaic module is located;

[0149] Among them, the parameter value correction module includes an open-circuit voltage correction sub-module: the open-circuit voltage correction sub-module is used to correct the parameter value of the open-circuit voltage of the photovoltaic module according to the wind speed data;

[0150] The open-circuit voltage correction sub-module includes:

[0151] An operating temperature correction unit for correcting the operating temperature of the photovoltaic module according to the wind speed data to obtain a corrected operating temperature value;

[0152] An open-circuit voltage correction unit for determining a corrected open-circuit voltage value of the open-circuit voltage of the photovoltaic module according to the corrected operating temperature value, where the correction result includes the corrected open-circuit voltage value.

[0153] Optionally, the operating temperature correction unit includes:

[0154] A wind speed correction coefficient determination sub-unit for determining a corresponding target wind speed correction coefficient according to the wind speed data and a preset wind speed correction function;

[0155] A wind speed correction amount determination sub-unit for calculating the quotient of the nominal wind speed correction coefficient and the target wind speed correction coefficient to obtain a wind speed correction amount, where the nominal wind speed correction coefficient is determined according to the nominal wind speed and the preset wind speed correction function;

[0156] An operating temperature correction sub-unit for substituting the wind speed correction amount into the operating temperature expression of the photovoltaic module under the nominal wind speed condition to determine the corrected operating temperature value.

[0157] Optionally, the at least one preset parameter includes the ultimate low temperature under the operating conditions of the photovoltaic module; the device further includes: a wind speed data acquisition module, configured to acquire the wind speed data of the working environment where the photovoltaic module is located.

[0158] Optionally, the parameter value correction module includes an ultimate low temperature correction sub-module: the ultimate low temperature correction sub-module is configured to correct the parameter value of the ultimate low temperature under the operating conditions of the photovoltaic module according to the wind speed data;

[0159] The ultimate low temperature correction sub-module includes:

[0160] a temperature deviation determination unit, configured to determine a corresponding target temperature deviation according to the wind speed data and a preset temperature deviation function, where the preset temperature deviation function is obtained by fitting the meteorological data within a preset historical period in the area where the photovoltaic module is located;

[0161] an ultimate low temperature correction unit, configured to correct the preset ultimate low temperature under the operating conditions of the photovoltaic module according to the target temperature deviation to obtain a corrected temperature value of the ultimate low temperature under the operating conditions of the photovoltaic module, where the correction result includes the corrected temperature value.

[0162] Optionally, the preset ultimate low temperature under the operating conditions of the photovoltaic module is the theoretical ground surface temperature at the start-up moment of the preset inverter; where the ultimate low temperature correction unit is configured to: calculate the sum of the target temperature deviation and the theoretical ground surface temperature at the start-up moment of the preset inverter to obtain the corrected temperature value of the ultimate low temperature under the operating conditions of the photovoltaic module.

[0163] The photovoltaic module series connection number determination device provided by the embodiments of the present invention can execute the photovoltaic module series connection number determination method provided by any embodiment of the present invention, and has corresponding functional modules and beneficial effects for executing the method.

[0164] Figure 6 FIG. shows a schematic structural diagram of an electronic device 10 that can be used to implement the embodiments of the present invention. The electronic device is intended to represent various forms of digital computers, such as, laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as, personal digital processing, cellular phones, smart phones, wearable devices (such as helmets, glasses, watches, etc.) and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely illustrative and are not intended to limit the implementation of the present invention described and / or claimed herein. As Figure 6As shown, the electronic device 10 includes at least one processor 11 and a memory communicatively connected to the at least one processor 11, such as a read-only memory (ROM) 12, a random access memory (RAM) 13, etc. The memory stores a computer program executable by the at least one processor. The processor 11 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 12 or the computer program loaded from the storage unit 18 into the random access memory (RAM) 13. In the RAM 13, various programs and data required for the operation of the electronic device 10 can also be stored. The processor 11, the ROM 12, and the RAM 13 are connected to each other via a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0165] Multiple components in the electronic device 10 are connected to the I / O interface 15, including: an input unit 16, such as a keyboard, a mouse, etc.; an output unit 17, such as various types of displays, speakers, etc.; a storage unit 18, such as a disk, an optical disc, etc.; and a communication unit 19, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 19 allows the electronic device 10 to exchange information / data with other devices via a computer network such as the Internet and / or various telecommunication networks.

[0166] The processor 11 can be various general-purpose and / or special-purpose processing components with processing and computing capabilities. Some examples of the processor 11 include but are not limited to a central processing unit (CPU), a graphics processing unit (GPU), various dedicated artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, etc. The processor 11 executes the various methods and processes described above, such as the method for determining the number of series-connected photovoltaic modules.

[0167] In some embodiments, the method for determining the number of series-connected photovoltaic modules can be implemented as a computer program tangibly embodied in a computer-readable storage medium, such as the storage unit 18. In some embodiments, part or all of the computer program can be loaded and / or installed onto the electronic device 10 via the ROM 12 and / or the communication unit 19. When the computer program is loaded into the RAM 13 and executed by the processor 11, one or more steps of the method for determining the number of series-connected photovoltaic modules described above can be executed. Alternatively, in other embodiments, the processor 11 can be configured to execute the method for determining the number of series-connected photovoltaic modules in any other appropriate manner (e.g., by means of firmware).

[0168] The various embodiments of the systems and techniques described above in this document can be implemented in digital electronic circuitry, integrated circuit systems, field programmable gate arrays (FPGA), application specific integrated circuits (ASIC), application specific standard products (ASSP), systems on a chip (SOC), complex programmable logic devices (CPLD), computer hardware, firmware, software, and / or combinations thereof. These various embodiments can include: being implemented in one or more computer programs that are executable and / or interpretable on a programmable system including at least one programmable processor, which can be a special-purpose or general-purpose programmable processor that receives data and instructions from a storage system, at least one input device, and at least one output device, and transmits the data and instructions to the storage system, the at least one input device, and the at least one output device.

[0169] The computer programs for implementing the methods of the present invention can be written in any combination of one or more programming languages. These computer programs can be provided to a processor of a general purpose computer, a special purpose computer, or other programmable data processing apparatus, such that the computer programs, when executed by the processor, cause the functions / operations specified in the flowchart and / or block diagram to be implemented. The computer programs can be executed entirely on the machine, partly on the machine, as a stand-alone software package partly on the machine and partly on a remote machine, or entirely on the remote machine or server.

[0170] In the context of the present invention, a computer-readable storage medium can be a tangible medium that can contain or store a computer program for use by or in connection with an instruction execution system, apparatus, or device. The computer-readable storage medium can include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination of the foregoing. Alternatively, the computer-readable storage medium can be a machine-readable signal medium. More specific examples of the machine-readable storage medium would include electrical connections based on one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, compact disc read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing.

[0171] To provide interaction with a user, the systems and techniques described herein can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and a pointing device (e.g., a mouse or a trackball) by which the user can provide input to the electronic device. Other kinds of devices can also be used to provide interaction with the user; for example, the feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including acoustic input, voice input, or tactile input).

[0172] The systems and techniques described herein can be implemented in a computing system including backend components (e.g., as a data server), or a computing system including middleware components (e.g., an application server), or a computing system including frontend components (e.g., a user computer having a graphical user interface or a web browser through which the user can interact with an implementation of the systems and techniques described herein), or a computing system including any combination of such backend components, middleware components, or frontend components. The components of the system can be interconnected to each other by digital data communication in any form or medium (e.g., a communication network). Examples of communication networks include: local area network (LAN), wide area network (WAN), blockchain network, and the Internet.

[0173] A computing system can include a client and a server. The client and the server are generally far from each other and typically interact through a communication network. The client - server relationship is created by computer programs running on respective computers and having a client - server relationship with each other. The server can be a cloud server, also known as a cloud computing server or a cloud host, which is a host product in the cloud computing service system and solves the defects of difficult management and weak business scalability existing in traditional physical hosts and VPS services.

[0174] An embodiment of the present disclosure provides a computer program product including a computer program which, when executed by a processor, implements the method for determining the number of series - connected photovoltaic components provided in the above - mentioned embodiment.

[0175] It should be understood that various forms of the processes shown above can be used, with steps reordered, added, or deleted. For example, the steps recited in the present invention can be executed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of the present invention can be achieved, and no limitation is made herein.

[0176] The above specific embodiments do not constitute a limitation to the protection scope of the present invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for determining the number of series-connected photovoltaic modules, characterized in that, Including: Obtaining a preset expression for the number of series-connected photovoltaic modules, where the preset expression is used to constrain the value range of the number of series-connected photovoltaic modules included in a photovoltaic string connected to a preset inverter; Correcting the parameter value of at least one preset parameter in the preset expression, where the preset parameter is a parameter related to the photovoltaic module; Determining the target number of series-connected photovoltaic modules according to the correction result and the preset expression.

2. The method according to claim 1, characterized in that, The at least one preset parameter includes the open-circuit voltage of the photovoltaic module; The method further includes: Obtaining wind speed data of the working environment where the photovoltaic module is located; The correcting the parameter value of at least one preset parameter in the preset expression includes: Correcting the operating temperature of the photovoltaic module according to the wind speed data to obtain a corrected operating temperature value; Determining a corrected open-circuit voltage value of the open-circuit voltage of the photovoltaic module according to the corrected operating temperature value, where the correction result includes the corrected open-circuit voltage value.

3. The method according to claim 2, wherein The correcting the operating temperature of the photovoltaic module according to the wind speed data to obtain a corrected operating temperature value includes: Determining a corresponding target wind speed correction coefficient according to the wind speed data and a preset wind speed correction function; Calculating the quotient of the nominal wind speed correction coefficient and the target wind speed correction coefficient to obtain a wind speed correction amount, where the nominal wind speed correction coefficient is determined according to the nominal wind speed and the preset wind speed correction function; Substituting the wind speed correction amount into the operating temperature expression of the photovoltaic module under the nominal wind speed condition to obtain a corrected operating temperature value.

4. The method according to claim 1, wherein The at least one preset parameter includes the limit low temperature under the working conditions of the photovoltaic module; The method further includes: Obtaining wind speed data of the working environment where the photovoltaic module is located; The correcting the parameter value of at least one preset parameter in the preset expression includes: Correcting the parameter value of the limit low temperature under the working conditions of the photovoltaic module according to the wind speed data.

5. The method according to claim 4, wherein The correcting the parameter value of the limit low temperature under the working conditions of the photovoltaic module according to the wind speed data includes: Determining a corresponding target temperature deviation according to the wind speed data and a preset temperature deviation function, where the preset temperature deviation function is obtained by fitting meteorological data in a preset historical period of the area where the photovoltaic module is located; Correcting the preset limit low temperature under the working conditions of the photovoltaic module according to the target temperature deviation to obtain a corrected temperature value of the limit low temperature under the working conditions of the photovoltaic module, where the correction result includes the corrected temperature value.

6. The method according to claim 5, wherein The preset limit low temperature under the working conditions of the photovoltaic module is the theoretical ground surface temperature at the starting moment of the preset inverter; Wherein, the correcting the preset limit low temperature under the working conditions of the photovoltaic module according to the target temperature deviation to obtain a corrected temperature value of the limit low temperature under the working conditions of the photovoltaic module includes: Calculating the sum of the target temperature deviation and the theoretical ground surface temperature at the starting moment of the preset inverter to obtain a corrected temperature value of the limit low temperature under the working conditions of the photovoltaic module.

7. A device for determining the number of series-connected photovoltaic modules, characterized in that, Including: An expression acquisition module, configured to acquire a preset expression for the number of series-connected photovoltaic components, where the preset expression is used to constrain the value range of the number of series-connected photovoltaic components included in a photovoltaic string connected to a preset inverter; A parameter value correction module, configured to correct the parameter value of at least one preset parameter in the preset expression, where the preset parameter is a parameter related to the photovoltaic component; A quantity determination module, configured to determine the target number of series-connected photovoltaic components according to the correction result and the preset expression.

8. An electronic device, characterized in that, The electronic device includes: At least one processor; and A memory communicatively connected to the at least one processor; wherein, The memory stores a computer program executable by the at least one processor, and when the computer program is executed by the at least one processor, the at least one processor is enabled to execute the method for determining the number of series-connected photovoltaic components according to any one of claims 1-6.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions, and when the computer instructions are executed by a processor, the method for determining the number of series-connected photovoltaic components according to any one of claims 1-6 is implemented.

10. A computer program product, characterized in that, The computer program product includes a computer program, and when the computer program is executed by a processor, the method for determining the number of series-connected photovoltaic components according to any one of claims 1-6 is implemented.

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