Photovoltaic module quantity optimization method, electronic equipment, medium and program product

Abstract

The invention provides a photovoltaic module number optimization method, electronic equipment, a medium and a program product, and the method comprises the steps: obtaining a working voltage correction value and an open-circuit voltage correction value of a photovoltaic module; determining a first series connection number range of the photovoltaic modules in the photovoltaic string based on the working voltage correction value; determining a second series connection number range of the photovoltaic modules in the photovoltaic string based on the open-circuit voltage correction value; and optimizing the series connection number of the photovoltaic modules in the photovoltaic string based on the first series connection number range and the second series connection number range. The working voltage and the open-circuit voltage closer to the real state of the photovoltaic module can be obtained by obtaining the working voltage correction value and the open-circuit voltage correction value of the photovoltaic module, and the first series connection number range and the second series connection number range of the photovoltaic module in the photovoltaic group string are respectively determined through the working voltage correction value and the open-circuit voltage correction value. And therefore, the number of the photovoltaic modules connected in series in the photovoltaic string can be accurately configured.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic power generation technology, specifically to a method for optimizing the number of photovoltaic modules, electronic equipment, dielectric materials, and program products. Background Technology

[0002] Photovoltaic modules are the core component of photovoltaic power plants. The main function of photovoltaic modules is to generate direct current (DC) using solar energy. Through connection with the DC side of an inverter, the inverter converts the DC power into alternating current (AC) power, thereby providing electricity.

[0003] Calculating the number of photovoltaic modules connected in series and in parallel is one of the fundamental tasks in photovoltaic power plant design. This step has a significant impact on the overall layout of the photovoltaic power plant, the design of the supporting system, and the selection of the capacity ratio. In order to ensure that the photovoltaic power plant takes into account both economy and safety, it is necessary to reasonably determine the number of photovoltaic modules connected in series and in parallel on the DC side of the inverter.

[0004] Currently, when calculating the number of photovoltaic modules connected in series in a photovoltaic power plant, in order to ensure the safe operation of the photovoltaic power plant, the calculation is usually based on various parameters of the photovoltaic string under extreme temperature conditions, for example, in the following way:

[0005]

[0006] Where N is the number of photovoltaic modules connected in series in the photovoltaic string, and V mpptmax V is the maximum voltage at the inverter's maximum power point. mpptmin V is the minimum voltage at the inverter's maximum power point. pm K is the operating voltage of the photovoltaic module, t is the extreme low temperature value under the operating conditions of the photovoltaic module, t′ is the extreme high temperature value under the operating conditions of the photovoltaic module, and K′ is the maximum operating voltage of the photovoltaic module. v相对 This represents the relative temperature coefficient of the operating voltage of a photovoltaic module.

[0007] However, this method typically uses the operating voltage of the photovoltaic modules provided by the manufacturer for calculation. Since the parameters of photovoltaic modules can change when affected by the environment, the operating voltage of the photovoltaic modules provided by the manufacturer is only applicable to standard environments and is not accurate in actual environments. Furthermore, due to the inaccuracy of the operating voltage of the photovoltaic modules, the number of photovoltaic modules connected in series in the final calculated photovoltaic string is also inaccurate. Summary of the Invention

[0008] The technical problem to be solved by this disclosure is to overcome the defect in the prior art that the number of photovoltaic modules in the photovoltaic string obtained by calculation when laying out a photovoltaic power plant is inaccurate, and to provide a method, electronic device, medium and program product for optimizing the number of photovoltaic modules.

[0009] This disclosure solves the above-mentioned technical problems through the following technical solution:

[0010] This disclosure provides a method for optimizing the number of photovoltaic modules, including:

[0011] Obtain the operating voltage correction value and open-circuit voltage correction value of the photovoltaic module;

[0012] The first range of the number of photovoltaic modules connected in series in the photovoltaic string is determined based on the working voltage correction value;

[0013] The second series number range of photovoltaic modules in the photovoltaic string is determined based on the open-circuit voltage correction value;

[0014] The number of photovoltaic modules connected in series in the photovoltaic string is optimized based on the first series number range and the second series number range.

[0015] Optionally, the steps of obtaining the operating voltage correction value and open-circuit voltage correction value of the photovoltaic module specifically include:

[0016] The operating temperature of the photovoltaic module and the irradiance at the corresponding location are obtained;

[0017] The operating voltage correction value is obtained based on the standard value of irradiance, operating temperature, standard value of operating temperature, standard value of operating voltage of the photovoltaic module, and the irradiance; and / or, the open-circuit voltage correction value of the photovoltaic module is obtained based on the standard value of irradiance, operating temperature, standard value of operating temperature, standard value of open-circuit voltage of the photovoltaic module, and the irradiance.

[0018] Optionally, the calculation formula for obtaining the working voltage correction value based on the photovoltaic module's irradiance standard value, operating temperature, operating temperature standard value, operating voltage standard value, and the irradiance is as follows:

[0019]

[0020] Among them, V pm This is the working voltage correction value, V pm，STC The standard operating voltage is T, and the operating temperature is T0. STC G represents the standard operating temperature, and G represents the irradiance. STC β1, β2, and β3 are the standard values ​​for irradiance, and correction coefficients.

[0021] Optionally, the calculation formula for obtaining the working voltage correction value based on the photovoltaic module's irradiance standard value, operating temperature, operating temperature standard value, operating voltage standard value, and the irradiance is as follows:

[0022]

[0023] Among them, Vpm This is the working voltage correction value, V pm，STC The standard operating voltage is T, and the operating temperature is T0. STC G represents the standard operating temperature, and G represents the irradiance. STC b1, b2, b3, and b4 are the standard values ​​for irradiance, and b4 are correction factors.

[0024] Optionally, the operating temperature is obtained as follows:

[0025] The operating temperature is obtained based on the standard value of irradiance of the photovoltaic module, ambient temperature, ambient humidity, wind speed, and the irradiance.

[0026] Optionally, the calculation formula for obtaining the operating temperature based on the standard value of irradiance of the photovoltaic module, ambient temperature, ambient humidity, wind speed, and the irradiance is as follows:

[0027]

[0028] Where T is the operating temperature, T amb For ambient temperature, G represents ambient humidity, and G represents irradiance. STC V is the standard value for irradiance. w Let be the wind speed, and a, b, c, d, e, f, g, and h be correction coefficients, and x be a correction constant.

[0029] Optionally, the calculation formula for obtaining the open-circuit voltage correction value of the photovoltaic module based on the standard value of the operating temperature, the standard value of irradiance, the standard value of open-circuit voltage, the operating temperature, and the irradiance is as follows:

[0030]

[0031] Among them, V oc V is the open-circuit voltage correction value. oc，STC Here, T represents the standard open-circuit voltage, and T represents the operating temperature. STC G represents the standard operating temperature, and G represents the irradiance. STC β4, β5, and β6 are the standard values ​​for irradiance, and correction factors.

[0032] Optionally, the calculation formula for obtaining the open-circuit voltage correction value of the photovoltaic module based on the standard value of the operating temperature, the standard value of irradiance, the standard value of open-circuit voltage, the operating temperature, and the irradiance is as follows:

[0033]

[0034] Among them, V oc V is the open-circuit voltage correction value. oc，STCHere, T represents the standard open-circuit voltage, and T represents the operating temperature. STC G represents the standard operating temperature, and G represents the irradiance. STC A represents the standard value of irradiance, and a1, a2, a3, and a4 are correction factors.

[0035] Optionally, the method further includes: determining the range of the number of photovoltaic strings connected in parallel based on the current value of the photovoltaic string and the maximum input current of the inverter, wherein the inverter is used to be electrically connected to the photovoltaic string;

[0036] The number of photovoltaic strings connected in parallel is optimized based on the range of the number of photovoltaic strings connected in parallel.

[0037] This disclosure also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and for running on the processor, wherein the processor executes the computer program to implement the aforementioned method for optimizing the number of photovoltaic modules.

[0038] This disclosure also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the aforementioned method for optimizing the number of photovoltaic modules.

[0039] This disclosure also provides a computer program product, including a computer program that, when executed by a processor, implements the aforementioned method for optimizing the number of photovoltaic modules.

[0040] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of this disclosure.

[0041] The positive and progressive effects of this disclosure are as follows: by obtaining the working voltage correction value and open-circuit voltage correction value of the photovoltaic module, the working voltage and open-circuit voltage that are closer to the actual state of the photovoltaic module can be obtained. By determining the first and second series number ranges of photovoltaic modules in the photovoltaic string through the working voltage correction value and the open-circuit voltage correction value, the series number range of photovoltaic modules in the photovoltaic string can be determined more accurately, and thus the series number of photovoltaic modules in the photovoltaic string can be configured more precisely. Attached Figure Description

[0042] Figure 1 A flowchart of a method for optimizing the number of photovoltaic modules provided in Embodiment 1 of this disclosure;

[0043] Figure 2 This is a schematic diagram of the structure of a photovoltaic module quantity adjustment circuit provided in Embodiment 1 of this disclosure;

[0044] Figure 3 This is a flowchart of step S1 in a method for optimizing the number of photovoltaic modules provided in Embodiment 1 of this disclosure;

[0045] Figure 4 This is a schematic diagram of the structure of an electronic device provided in Embodiment 2 of this disclosure. Detailed Implementation

[0046] The present disclosure is further illustrated below by way of embodiments, but the present disclosure is not limited to the scope of the embodiments described herein.

[0047] The prefixes such as "first" and "second" used in this disclosure are merely for distinguishing different descriptive objects and do not limit the position, order, priority, quantity, or content of the described objects. The use of ordinal numbers and other prefixes used to distinguish descriptive objects in this disclosure does not constitute a limitation on the described objects. The description of the described objects is given in the claims or the context of the embodiments, and should not be construed as an unnecessary limitation. Furthermore, in the description of this embodiment, unless otherwise stated, "multiple" means two or more.

[0048] Example 1

[0049] Figure 1 A flowchart of a method for optimizing the number of photovoltaic modules provided as an exemplary embodiment of this disclosure, the method comprising:

[0050] S1. Obtain the working voltage correction value and open circuit voltage correction value of the photovoltaic module.

[0051] S2. Determine the first series number range of photovoltaic modules in the photovoltaic string based on the working voltage correction value.

[0052] S3. Determine the range of the second series number of photovoltaic modules in the photovoltaic string based on the open-circuit voltage correction value.

[0053] S4. Optimize the number of photovoltaic modules in series in a photovoltaic string based on the first series number range and the second series number range.

[0054] This solution does not limit the execution order of steps S2 and S3. S2 or S3 can be executed first, or S2 and S3 can be executed simultaneously, depending on practical needs.

[0055] In the prior art, the calculation of the range of the number of photovoltaic modules in series in a photovoltaic string does not take into account the correction of relevant parameters. Therefore, this disclosure calculates the range of the number of photovoltaic modules in series in a photovoltaic string based on the corrected operating voltage and open circuit voltage, and the result is more accurate.

[0056] In an optional implementation, step S1 specifically includes:

[0057] S11. Obtain the operating temperature of the photovoltaic module and the irradiance at the corresponding location.

[0058] S12. Obtain the working voltage correction value based on the standard value of irradiance, operating temperature, standard value of operating temperature, standard value of operating voltage, and irradiance of the photovoltaic module; and / or, obtain the open-circuit voltage correction value of the photovoltaic module based on the standard value of irradiance, operating temperature, standard value of operating temperature, standard value of open-circuit voltage, and irradiance of the photovoltaic module.

[0059] In one alternative implementation, irradiance can be obtained either through sensors or through meteorological information related to irradiance, such as networks. Specifically:

[0060] Irradiance can be obtained through sensors in several ways, including but not limited to the following: obtaining the irradiance at the location of the photovoltaic modules before the photovoltaic power station is built, specifically, it can be used to obtain the irradiance at the planned installation location of the photovoltaic modules, or the irradiance at the planned location of the photovoltaic power station; obtaining the irradiance at the location of the photovoltaic modules after the photovoltaic power station is built, specifically, it can be used to obtain the irradiance at the actual location of the photovoltaic modules, or the irradiance of the photovoltaic power station where the photovoltaic modules are located.

[0061] Obtaining irradiance through meteorological information includes, but is not limited to, the following situations: obtaining the irradiance of the area where the photovoltaic power station is located before its construction; obtaining the irradiance of the area where the photovoltaic power station is located after its construction.

[0062] By obtaining the irradiance before the photovoltaic power plant is built, the number of photovoltaic modules can be optimized based on this method, and the layout of the photovoltaic modules in the photovoltaic power plant can be optimized according to the optimized number. Similarly, by obtaining the irradiance after the photovoltaic power plant is built, the number of photovoltaic modules can be optimized based on this method, and the layout of the photovoltaic modules in the photovoltaic power plant can be dynamically adjusted according to the optimized number. The number here is not limited to the number of photovoltaic modules connected in series in a photovoltaic string, but also includes the number of photovoltaic strings connected in parallel.

[0063] In one optional implementation, the irradiance at the location corresponding to the photovoltaic module includes, but is not limited to: the maximum irradiance within a preset time period, the average irradiance within a preset time period, the median irradiance within a preset time period, and the real-time irradiance.

[0064] In one optional implementation, the operating temperature at the location of the photovoltaic module includes, but is not limited to: the highest temperature within a preset time period, the average temperature within a preset time period, the median temperature within a preset time period, and the real-time operating temperature.

[0065] In an optional implementation, the calculation formula for the photovoltaic module's irradiance standard value, operating temperature, operating temperature standard value, operating voltage standard value, and irradiance-based operating voltage correction value is as follows:

[0066]

[0067] Among them, V pm This is the working voltage correction value, V pm，STC The standard operating voltage is T, and the operating temperature is T0. STC G represents the standard operating temperature, and G represents the irradiance. STC Here, β1, β2, and β3 represent the standard irradiance value, while β3, β1, β2, and β3 are correction coefficients. These correction coefficients can be obtained based on historical experimental data, which may include the correspondence between the operating voltage and the variables in the above formula.

[0068] In an optional implementation, the calculation formula for the photovoltaic module's irradiance standard value, operating temperature, operating temperature standard value, operating voltage standard value, and irradiance-based operating voltage correction value is as follows:

[0069]

[0070] Among them, V pm This is the working voltage correction value, V pm,STC The standard operating voltage is T, and the operating temperature is T0. STC G represents the standard operating temperature, and G represents the irradiance. STC Here, b1, b2, b3, and b4 are the standard values ​​for irradiance, and b4 are correction coefficients. These correction coefficients can be obtained based on historical experimental data, which may include the correspondence between the operating voltage and the variables in the above formula.

[0071] In an optional implementation, the formula for calculating the open-circuit voltage correction value of the photovoltaic module based on the standard values ​​of the photovoltaic module's operating temperature, irradiance, and open-circuit voltage, as well as the operating temperature and irradiance, is as follows:

[0072]

[0073] Among them, V oc V is the open-circuit voltage correction value. oc,STC Here, T represents the standard open-circuit voltage, and T represents the operating temperature. STC G represents the standard operating temperature, and G represents the irradiance. STC β4, β5, and β6 are the standard values ​​for irradiance. The correction coefficients can be obtained based on historical experimental data, which may include the correspondence between open-circuit voltage and the variables in the above formula.

[0074] In an optional implementation, the formula for calculating the open-circuit voltage correction value of the photovoltaic module based on the standard values ​​of the photovoltaic module's operating temperature, irradiance, and open-circuit voltage, as well as the operating temperature and irradiance, is as follows:

[0075]

[0076] Among them, V oc V is the open-circuit voltage correction value. oc,STC Here, T represents the standard open-circuit voltage, and T represents the operating temperature. STC G represents the standard operating temperature, and G represents the irradiance. STC Here, a1, a2, a3, and a4 are the standard values ​​for irradiance, and a4, a2, a3, and a4 are correction factors. These correction factors can be obtained based on historical experimental data, which may include the correspondence between open-circuit voltage and the variables in the above formula.

[0077] In an optional implementation, the first range of the number of photovoltaic modules in series in step S2 is determined as follows:

[0078]

[0079] Where N is the number of photovoltaic modules connected in series in the photovoltaic string, and V mpptmax V is the maximum voltage at the inverter's maximum power point. mpptmin V is the minimum voltage at the inverter's maximum power point. pm K' represents the corrected operating voltage value for the photovoltaic module, t represents the extreme low temperature value under the operating conditions of the photovoltaic module, t′ represents the extreme high temperature value under the operating conditions of the photovoltaic module, and K′ represents the extreme low temperature value under the operating conditions of the photovoltaic module. v相对 T is the relative temperature coefficient of the operating voltage of a photovoltaic module. STC This is the standard operating temperature value. Preferably, T... STC =25℃.

[0080] In an optional implementation, the second series quantity range in step S3 is determined as follows:

[0081]

[0082] Where N is the number of photovoltaic modules connected in series, and V dcmax V is the maximum input voltage of the inverter. oc Here, K represents the open-circuit voltage correction value, t represents the extreme low temperature value under the operating conditions of the photovoltaic module, and K represents the low temperature value. v相对 T is the relative temperature coefficient of open-circuit voltage. STC This is the standard operating temperature value. Preferably, T... STC =25℃.

[0083] In an optional implementation, step S4 is followed by:

[0084] S5. Determine the range of the number of photovoltaic strings to be connected in parallel based on the current value of the photovoltaic strings and the maximum input current of the inverter. The inverter is used to electrically connect to the photovoltaic strings.

[0085] The specific calculation method is as follows: the product of the number of photovoltaic strings connected in parallel and the current value of the photovoltaic strings should not be greater than the maximum input current of the inverter.

[0086] S6. Optimize the number of photovoltaic strings in parallel based on the range of the number of photovoltaic strings in parallel.

[0087] In one optional implementation, step S6 includes, but is not limited to, the following methods:

[0088] During the construction phase of a photovoltaic power station, if the number of photovoltaic strings connected in parallel can be dynamically adjusted, a higher number of parallel strings can be selected within the range of parallel strings to construct the photovoltaic power station, so that after the photovoltaic power station is completed, it can be dynamically adjusted within a larger range.

[0089] During the construction phase of a photovoltaic power plant, if the number of photovoltaic strings connected in parallel can be dynamically adjusted, the irradiance can be obtained in real time, the range of the number of parallel strings can be calculated, and the maximum value within the range can be selected as the number of photovoltaic strings connected in parallel, thereby improving the power generation efficiency of the photovoltaic power plant.

[0090] In an optional implementation, Figure 2 This is a photovoltaic module quantity adjustment circuit. The number of photovoltaic modules connected in series in a photovoltaic power station can be dynamically adjusted by the quantity adjustment circuit. In addition, the number of photovoltaic modules connected in parallel can also be adjusted by the quantity adjustment circuit. Those skilled in the art can also make adaptive settings according to practice.

[0091] In the quantity adjustment circuit, each photovoltaic module is connected in parallel with a short-circuit switch. When it is necessary to reduce the number of photovoltaic modules in series, the corresponding number of short-circuit switches are closed. When it is necessary to increase the number of photovoltaic modules in series, the corresponding number of short-circuit switches are opened.

[0092] Furthermore, in the quantity adjustment circuit, each photovoltaic string is electrically connected to the inverter through a selection switch. When it is necessary to reduce the number of photovoltaic strings in parallel, the corresponding number of short-circuit switches are opened; when it is necessary to increase the number of photovoltaic strings in parallel, the corresponding number of short-circuit switches are closed.

[0093] In an optional implementation, refer to Figure 3 A flowchart of step S1 is provided, wherein step S1 specifically includes:

[0094] S13. Obtain the ambient temperature, humidity and wind speed of the photovoltaic module.

[0095] S14. Based on the standard value of irradiance of photovoltaic modules, ambient temperature, ambient humidity, wind speed and irradiance acquisition operating temperature.

[0096] S15. Obtain the working voltage correction value and open circuit voltage correction value of the photovoltaic module based on the working temperature.

[0097] In one alternative implementation, ambient temperature, humidity, and wind speed can be acquired either through sensors or through meteorological information related to these parameters, such as networks. Specifically:

[0098] The acquisition of ambient temperature, humidity, and wind speed through sensors includes, but is not limited to, the following: acquiring the ambient temperature, humidity, and wind speed at the location of the photovoltaic modules before the photovoltaic power station is built, specifically acquiring the ambient temperature, humidity, and wind speed at the planned installation location of the photovoltaic modules, or acquiring the ambient temperature, humidity, and wind speed at the planned location of the photovoltaic power station; acquiring the ambient temperature, humidity, and wind speed at the location of the photovoltaic modules after the photovoltaic power station is built, specifically acquiring the ambient temperature, humidity, and wind speed at the actual location of the photovoltaic modules, or acquiring the ambient temperature, humidity, and wind speed of the photovoltaic power station where the photovoltaic modules are located.

[0099] Meteorological information is used to obtain ambient temperature, humidity, and wind speed, including but not limited to the following: obtaining the ambient temperature, humidity, and wind speed of the area where the photovoltaic power station is located before its construction; obtaining the ambient temperature, humidity, and wind speed of the area where the photovoltaic power station is located after its construction.

[0100] By obtaining the ambient temperature, humidity, and wind speed before the photovoltaic power station is built, the number of photovoltaic modules can be optimized based on this method. This optimized quantity allows for a more optimized layout design of the photovoltaic modules within the power station. Similarly, by obtaining the ambient temperature, humidity, and wind speed after the photovoltaic power station is built, the number of photovoltaic modules can be optimized based on this method, allowing for dynamic adjustments to the layout of the photovoltaic modules within the power station. The quantity here is not limited to the number of photovoltaic modules connected in series within a photovoltaic string, but also includes the number of photovoltaic strings connected in parallel.

[0101] In one optional implementation, the ambient temperature, humidity, and wind speed at the location of the photovoltaic module include, but are not limited to: the maximum ambient temperature, humidity, and wind speed within a preset time period; the average ambient temperature, humidity, and wind speed within a preset time period; the median ambient temperature, humidity, and wind speed within a preset time period; and the real-time ambient temperature, humidity, and wind speed.

[0102] In an optional implementation, the calculation formula for obtaining the operating temperature based on the standard value of irradiance of the photovoltaic module, ambient temperature, ambient humidity, wind speed, and irradiance is as follows:

[0103]

[0104] Where T is the operating temperature, T amb For ambient temperature, G represents ambient humidity, and G represents irradiance. STC V is the standard value for irradiance. w Let x be the wind speed, a, b, c, d, e, f, g, and h be correction coefficients, and x be a correction constant. Preferably, x = 273.15 and h = 1 / 3.

[0105] The following is an example of applying this method: If the operating voltage V of the photovoltaic module pm The relative temperature coefficient K′ of the operating voltage of the photovoltaic module is 29.2V. v相对 The value is -0.43% / ℃, and the standard operating temperature T is... STC The extreme low temperature t under photovoltaic module operating conditions is -30℃, and the extreme high temperature t′ under photovoltaic module operating conditions is 65℃; the maximum voltage V at the maximum power point of the inverter. mpptmax The minimum voltage V at the maximum power point of the inverter is 850V. mpptmin It is 420V.

[0106] In the existing technology, without correcting the operating voltage, the range of the first series connection quantity can be obtained based on the above parameters:

[0107]

[0108] If the open-circuit voltage V of the photovoltaic module oc The voltage is 36.7V, the absolute temperature coefficient of the open-circuit voltage of the photovoltaic module is -0.123V / ℃, and the relative temperature coefficient of the open-circuit voltage of the photovoltaic module is -0.45% / ℃; the maximum input voltage of the inverter is 1000V.

[0109] In the existing technology, without correcting the open-circuit voltage, the range of the second series quantity can be obtained based on the above parameters:

[0110]

[0111] By using the first series quantity range and the second series quantity range, when configuring the number of photovoltaic modules in a photovoltaic power station, any number can be selected from the intersection of the first series quantity range and the second series quantity range, i.e., 17.37≤N≤21.84.

[0112] In practice, sensors cannot directly obtain the operating temperature of photovoltaic modules; what they usually obtain is the ambient temperature of the photovoltaic modules.

[0113] If the obtained irradiance G is 600 W / m2 Ambient temperature T amb The temperature is 18℃ and the ambient humidity is [missing information]. 80%, wind speed V w Given a velocity of 4 m / s, a = 3.941, b = 281.7, c = 0.01088, d = 269.1, e = 0.0056, f = -0.1761, g = 275.9, x = 273.15, and h = 1 / 3, the operating temperature T can be obtained as:

[0114]

[0115] Based on T = 27.54℃, if β1 = -0.488, β2 = -0.001, and β3 = 2.47568, the working voltage correction value can be obtained as follows:

[0116]

[0117] (The result is approximately two decimal places) or,

[0118] If b1 = -0.009, b2 = 1.9, b3 = -0.0764, and b4 = 0.0362, the working voltage correction value can be obtained:

[0119]

[0120] (The result is approximately two decimal places)

[0121] Based on T = 27.54℃, if β4 = -0.498, β5 = -0.001, and β6 = 2.368, the open-circuit voltage correction value can be obtained as follows:

[0122]

[0123] or,

[0124] If a1 = -0.01, a2 = 1.9, a3 = -0.09, and a4 = 0.04, the open-circuit voltage correction value can be obtained:

[0125]

[0126] (The result is approximately two decimal places)

[0127] Based on the working voltage correction value V pm =27.81 (28.06 can also be used, depending on practical needs), which can be used to calculate the range of the first series connection quantity:

[0128]

[0129] Therefore, based on the obtained working voltage correction value, compared with the first series number range calculated in the prior art, the calculation result is corrected from 17.37≤N≤23.54 to 18.23≤N≤24.72.

[0130] Based on the corrected open-circuit voltage V oc =35.31 (34.61 can also be used, depending on the actual situation), which gives the range of the second series quantity:

[0131]

[0132] Therefore, based on the obtained open-circuit voltage correction value, compared with the second series quantity range calculated in the prior art, the calculation result is corrected from N≤21.84 to N≤22.71. Furthermore, combined with the corrected first series quantity range of 18.23≤N≤24.72, the ideal value range of N can be determined as: 18.23≤N≤22.71, which is more accurate than the value range of 17.37≤N≤21.84 determined in the prior art.

[0133] By using the aforementioned range of series connection numbers, when dynamically adjusting the number of photovoltaic modules in a photovoltaic power station, the number of photovoltaic modules connected in series in a photovoltaic string can be increased to 22. This can improve the voltage after series connection, reduce DC line loss, and thus improve the efficiency and capacity ratio of the photovoltaic power generation system. Furthermore, since the inverter needs to reach a certain input voltage and power level to start up, if the voltage of the photovoltaic string is higher, the inverter can start up earlier even when the sunlight is weak in the morning. Similarly, when the sunlight gradually weakens in the evening, the higher voltage allows the inverter to delay its shutdown time, thereby increasing the inverter's operating time and improving the power generation efficiency of the photovoltaic power station.

[0134] This disclosure embodiment considers the actual situation of the photovoltaic module and calculates the operating temperature. Based on the operating temperature, the operating voltage and open-circuit voltage of the photovoltaic module can be further corrected, resulting in operating voltage correction values ​​and open-circuit voltage correction values ​​that are closer to the actual state of the photovoltaic module. This allows for a more accurate configuration of the number of photovoltaic modules connected in series in the photovoltaic string.

[0135] Example 2

[0136] Figure 4 This is a schematic diagram of the structure of an electronic device according to an example embodiment of the present disclosure. The electronic device includes a memory, a processor, and a computer program stored in the memory and used to run on the processor. When the processor executes the computer program, it implements the photovoltaic module quantity optimization method described in any of the above embodiments. Figure 4 The electronic device 90 shown is merely an example and should not impose any limitation on the functionality and scope of use of the embodiments disclosed herein.

[0137] like Figure 4 As shown, the electronic device 90 can be manifested as a general-purpose computing device, such as a server device. The components of the electronic device 90 may include, but are not limited to: at least one processor 91, at least one memory 92, and a bus 93 connecting different system components (including memory 92 and processor 91).

[0138] Bus 93 includes a data bus, an address bus, and a control bus.

[0139] The memory 92 may include volatile memory, such as random access memory (RAM) 921 and / or cache memory 922, and may further include read-only memory (ROM) 923.

[0140] The memory 92 may also include a program tool 925 (or utility) having a set (at least one) program module 924, including but not limited to: an operating system, one or more application programs, other program modules, and program data, each or some combination of these examples may include an implementation of a network environment.

[0141] The processor 91 executes various functional applications and data processing by running computer programs stored in the memory 92, such as the photovoltaic module quantity optimization method provided in any of the above embodiments.

[0142] Electronic device 90 can also communicate with one or more external devices 94 (e.g., keyboard, pointing device, etc.). This communication can be performed through input / output (I / O) interface 95. Furthermore, electronic device 90 can also communicate with one or more networks (e.g., local area network (LAN), wide area network (WAN), and / or public network, such as the Internet) via network adapter 96. As shown, network adapter 96 communicates with other modules of electronic device 90 via bus 93. It should be understood that, although... Figure 4 Not shown, it can be used in conjunction with electronic device 90 with other hardware and / or software modules, including but not limited to: microcode, device drivers, redundant processors, external disk drive arrays, RAID (disk array) systems, tape drives, and data backup storage systems.

[0143] It should be noted that although several units / modules or sub-units / modules of the electronic device have been mentioned in the detailed description above, this division is merely exemplary and not mandatory. In fact, according to embodiments of this disclosure, the features and functions of two or more units / modules described above can be embodied in one unit / module. Conversely, the features and functions of one unit / module described above can be further divided and embodied by multiple units / modules.

[0144] Example 3

[0145] This disclosure also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the photovoltaic module quantity optimization method provided in any of the above embodiments.

[0146] The readable storage medium may be more specifically adopted, including but not limited to: portable disk, hard disk, random access memory, read-only memory, erasable programmable read-only memory, optical storage device, magnetic storage device, or any suitable combination thereof.

[0147] Example 4

[0148] This disclosure also provides a computer program product, including a computer program that, when executed by a processor, implements the photovoltaic module quantity optimization method described in any of the above embodiments.

[0149] The program code for executing the computer program product of this disclosure can be written in any combination of one or more programming languages, and the program code can be executed entirely on a user device, partially on a user device, as a stand-alone software package, partially on a user device and partially on a remote device, or entirely on a remote device.

[0150] While specific embodiments of this disclosure have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this disclosure is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this disclosure, but all such changes and modifications fall within the scope of protection of this disclosure.

Claims

1. A method of number optimization of a photovoltaic assembly, characterized in that, The method comprises: obtaining a working voltage correction value and an open circuit voltage correction value of a photovoltaic module; determining a first series number range of the photovoltaic module in a photovoltaic module string based on the working voltage correction value; determining a second series number range of the photovoltaic module in the photovoltaic module string based on the open circuit voltage correction value; optimizing the series number of the photovoltaic module in the photovoltaic module string based on the first series number range and the second series number range.

2. The quantity optimization method of claim 1, wherein, The step of obtaining the working voltage correction value and the open circuit voltage correction value of the photovoltaic module specifically comprises: obtaining a working temperature of the photovoltaic module and an irradiance at a corresponding position; obtaining the working voltage correction value based on an irradiance standard value, the working temperature, a working temperature standard value, a working voltage standard value and the irradiance of the photovoltaic module; and / or, obtaining the open circuit voltage correction value of the photovoltaic module based on the irradiance standard value, the working temperature, the working temperature standard value, an open circuit voltage standard value and the irradiance of the photovoltaic module.

3. The quantity optimization method of claim 2, wherein, The calculation formula for obtaining the working voltage correction value based on the irradiance standard value, the working temperature, the working temperature standard value, the working voltage standard value and the irradiance of the photovoltaic module is: wherein V pm is a working voltage correction value, V pm,STC is a working voltage standard value, T is a working temperature, T STC is a working temperature standard value, G is an irradiance, G STC is an irradiance standard value, β1, β2, β3 are correction coefficients; or, wherein V pm is a working voltage correction value, V pm，STC is a working voltage standard value, T is a working temperature, T STC is a working temperature standard value, G is an irradiance, G STC is an irradiance standard value, and b1, b2, b3, and b4 are correction coefficients.

4. The quantity optimization method of claim 3, wherein, The working temperature is obtained in the following way: obtaining the working temperature based on an irradiance standard value, an ambient temperature, an ambient humidity, a wind speed and the irradiance of the photovoltaic module.

5. The quantity optimization method of claim 4, wherein, The calculation formula for obtaining the working temperature based on the irradiance standard value, the ambient temperature, the ambient humidity, the wind speed and the irradiance of the photovoltaic module is: where T is the working temperature, T amb is the ambient temperature, is the ambient humidity, G is the irradiance, G STC is the irradiance standard value, V w is the wind speed, a, b, c, d, e, f, g, and h are correction coefficients, and x is a correction number.

6. The quantity optimization method of claim 2, wherein, The calculation formula for obtaining the open circuit voltage correction value of the photovoltaic module based on the working temperature standard value, the irradiance standard value, the open circuit voltage standard value, the working temperature and the irradiance of the photovoltaic module is: wherein V oc is an open circuit voltage correction value, V oc，STC is an open circuit voltage standard value, T is an operating temperature, T STC is an operating temperature standard value, G is an irradiance, G STC is an irradiance standard value, β4, β5, β6 are correction coefficients; or, wherein V oc is an open circuit voltage correction value, V oc，STC is an open circuit voltage standard value, T is an operating temperature, T STC is an operating temperature standard value, G is an irradiance, G STC is an irradiance standard value, and a1, a2, a3, and a4 are correction coefficients.

7. The quantity optimization method of claim 1, wherein, The method further comprises: determining a parallel number range of the photovoltaic module string based on a current value of the photovoltaic module string and a maximum input current of an inverter, the inverter being electrically connected to the photovoltaic module string; optimizing the parallel number of the photovoltaic module string based on the parallel number range of the photovoltaic module string.

8. An electronic device comprising a memory, a processor, and a computer program stored on the memory for running on the processor, characterized in that, The processor executes the computer program to realize the photovoltaic module number optimization method in any one of claims 1 to 7.

9. A computer readable storage medium having stored thereon a computer program, characterized in that, The computer program is executed by the processor to realize the photovoltaic module number optimization method in any one of claims 1 to 7.

10. A computer program product comprising a computer program, characterized in that, The computer program is executed by the processor to realize the photovoltaic module number optimization method in any one of claims 1 to 7.

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