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

Abstract

The invention provides a photovoltaic module number optimization method, electronic equipment, medium and program product, and the method comprises the steps: obtaining the electrical performance parameter correction value of a photovoltaic module, the electrical performance parameter correction value comprising an open-circuit voltage correction value and / or an open-circuit voltage relative temperature coefficient correction value; determining the series connection number range of the photovoltaic modules in the photovoltaic string based on the electrical performance parameter correction values of the photovoltaic modules; optimizing the serial connection number of the photovoltaic modules in the photovoltaic string based on the serial connection number range of the photovoltaic modules in the photovoltaic string; and determining the parallel connection number range of the photovoltaic strings, and optimizing the parallel connection number of the photovoltaic strings based on the parallel connection number range of the photovoltaic strings. According to the invention, by obtaining the electrical performance parameter correction values of the photovoltaic modules, the number of the photovoltaic modules connected in series in the photovoltaic strings can be configured more accurately, and the number of the photovoltaic strings connected in parallel can be configured more accurately.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of photovoltaic power generation, and in particular to a photovoltaic module quantity optimization method, an electronic device, a medium and a program product. BACKGROUND

[0002] The photovoltaic module is a core component of the photovoltaic power station, and the main function of the photovoltaic module is to generate direct current by using solar energy, and to convert the direct current into alternating current by connecting with the direct current side of the inverter, so as to realize power supply.

[0003] The calculation of the series quantity and the parallel quantity of the photovoltaic module is one of the basic works of the photovoltaic power station design, and this link has an important influence on the overall layout of the photovoltaic power station, the design of the support system and the selection of the capacity ratio, etc. In order to ensure that the photovoltaic power station gives consideration to economy and safety, it is necessary to reasonably determine the series quantity and the parallel quantity of the photovoltaic module on the direct current side of the inverter.

[0004] At present, when calculating the series quantity of the photovoltaic module in the photovoltaic module string, in order to ensure the working safety of the photovoltaic power station, the parameters of the photovoltaic module string under extreme temperature conditions are usually used for determination, for example, in the following way:

[0005]

[0006] Wherein, N is the series quantity of the photovoltaic module, V dcmax is the maximum input voltage of the inverter, V oc is the open circuit voltage, t is the limit low temperature value under the working condition of the photovoltaic module, K v相对 is the relative temperature coefficient of the open circuit voltage.

[0007] However, this method usually uses the fixed values of the open circuit voltage and the open circuit voltage temperature coefficient of the photovoltaic module provided by the manufacturer for calculation. Since the parameters of the photovoltaic module will change when it is affected by the environment, the open circuit voltage and the open circuit voltage temperature coefficient of the photovoltaic module provided by the manufacturer are only applicable to the standard environment and are not accurate in the actual environment. Moreover, since the open circuit voltage and the open circuit voltage temperature coefficient of the photovoltaic module are not accurate, the series quantity of the photovoltaic module in the photovoltaic module string calculated finally is also not accurate. SUMMARY

[0008] The technical problem to be solved by the present disclosure is to overcome the defect that the result of determining the series quantity of the photovoltaic module in the photovoltaic module string in the prior art is not accurate, and to provide a photovoltaic module quantity optimization method, an electronic device, a medium and a program product.

[0009] The present disclosure solves the above technical problems by the following technical scheme:

[0010] The present disclosure provides a quantity optimization method of a photovoltaic module, comprising:

[0011] obtaining an electrical performance parameter correction value of the photovoltaic module, the electrical performance parameter correction value comprising an open circuit voltage correction value and / or an open circuit voltage relative temperature coefficient correction value;

[0012] determining a serial quantity range of the photovoltaic modules in a photovoltaic module string based on the electrical performance parameter correction value of the photovoltaic module;

[0013] optimizing the serial quantity of the photovoltaic modules in the photovoltaic module string based on the serial quantity range of the photovoltaic modules in the photovoltaic module string;

[0014] determining a parallel quantity range of the photovoltaic module string, and optimizing the parallel quantity of the photovoltaic module string based on the parallel quantity range of the photovoltaic module string.

[0015] Optionally, the electrical performance parameter correction value comprises the open circuit voltage relative temperature coefficient correction value, and the step of obtaining the electrical performance parameter correction value of the photovoltaic module specifically comprises:

[0016] obtaining the irradiance at the corresponding position of the photovoltaic module;

[0017] obtaining the open circuit voltage relative temperature coefficient correction value of the photovoltaic module based on the irradiance.

[0018] Optionally, the calculation formula of the electrical performance parameter correction value of the photovoltaic module based on the irradiance is:

[0019]

[0020] wherein, K v相对 is the open circuit voltage relative temperature coefficient correction value, is the ratio of the open circuit voltage relative temperature coefficient correction value to the open circuit voltage relative temperature coefficient standard value, K v相对，STC is the open circuit voltage relative temperature coefficient standard value;

[0021] the calculation formula of K

[0022]

[0023] wherein, G * is the ratio of the irradiance of the photovoltaic module to the irradiance standard value, γ is a correction coefficient, and α is a correction number.

[0024] Optionally, the calculation formula of K

[0025]

[0026] wherein n is an ideal factor, k is a Boltzmann constant, T is an operating temperature, G * is a ratio of the irradiance of the photovoltaic module to an irradiance standard value, E g0 is a material band gap, V oc，STC is an open circuit voltage standard value, and Γ is a constant related to the ideal factor.

[0027] Optionally, the electrical performance parameter correction value includes an open circuit voltage correction value, and the method for obtaining the electrical performance parameter correction value of the photovoltaic module based on the irradiance specifically includes:

[0028] obtaining the open circuit voltage correction value of the photovoltaic module based on the irradiance, the irradiance standard value, the operating temperature, the operating temperature standard value, and the open circuit voltage standard value of the photovoltaic module.

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

[0030] V oc (T,G)=V oc，STC (T STC ,G STC )+K v绝对 (T-T STC )+∑a i (G-G STC ) i

[0031] wherein V oc is the open circuit voltage correction value, V oc，STC (T STC ,G STC ) is the open circuit voltage standard value, T is the operating temperature, T STC is the operating temperature standard value, G is the irradiance, G STC is the irradiance standard value, K v绝对 is an open circuit voltage absolute temperature coefficient, a i is a correction coefficient, and i is a positive integer.

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

[0033]

[0034] wherein V oc is the open circuit voltage correction value, and V oc，STC is the open circuit voltage standard value, T is the operating temperature, and T STCG is the irradiance standard value, G STC K is the irradiance standard value, K v绝对 c is the open-circuit voltage absolute temperature coefficient, c j j is a positive integer.

[0035] Optionally, the step of determining the parallel quantity range of the photovoltaic module string comprises:

[0036] determining the parallel quantity range of the photovoltaic module string based on the current value of the photovoltaic module string and the maximum input current of an inverter electrically connected to the photovoltaic module string;

[0037] optimizing the parallel quantity of the photovoltaic module string based on the parallel quantity range of the photovoltaic module string.

[0038] Optionally, the irradiance of the corresponding position of the photovoltaic module includes any one of the following: the maximum irradiance in a preset time period, the average irradiance in a preset time period, the median of the irradiance in a preset time period, and the real-time irradiance.

[0039] The present disclosure also provides an electronic device comprising a memory, a processor, and a computer program stored on the memory and configured to run on the processor, wherein the processor implements the photovoltaic module quantity optimization method described above when executing the computer program.

[0040] The present disclosure also provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program is executed by a processor to implement the photovoltaic module quantity optimization method described above.

[0041] The present disclosure also provides a computer program product comprising a computer program, wherein the computer program is executed by a processor to implement the photovoltaic module quantity optimization method described above.

[0042] On the basis of common sense in the art, the above-mentioned preferred conditions can be combined arbitrarily, i.e., to obtain each preferred example of the present disclosure.

[0043] The positive progress effect of the present disclosure is that by obtaining the electrical performance parameter correction value of the photovoltaic module, the series quantity of the photovoltaic modules in the photovoltaic module string can be configured more accurately, and the parallel quantity of the photovoltaic module string can be configured more accurately. BRIEF DESCRIPTION OF DRAWINGS

[0044] Figure 1 A flowchart of a photovoltaic module quantity optimization method provided by an embodiment of the present disclosure;

[0045] Figure 2 A schematic diagram of the corresponding relationship between the open-circuit voltage relative temperature coefficient and the irradiance of the photovoltaic module provided by an embodiment of the present disclosure;

[0046] Figure 3 A structure diagram of a quantity adjustment circuit of a photovoltaic module provided for Embodiment 1 of the present disclosure is shown in the figure.

[0047] Figure 4 A flowchart of a quantity optimization method of a photovoltaic module provided for Embodiment 2 of the present disclosure is shown in the figure.

[0048] Figure 5 A flowchart of a quantity optimization method of a photovoltaic module provided for Embodiment 3 of the present disclosure is shown in the figure.

[0049] Figure 6 A structure diagram of an electronic device provided for Embodiment 4 of the present disclosure is shown in the figure. DETAILED DESCRIPTION

[0050] The present disclosure will be further described below by way of examples, but the present disclosure is not limited to the examples.

[0051] In the embodiments of the present disclosure, the prefix words such as “first”, “second” are merely used to distinguish different description objects, and have no limiting effect on the position, order, priority, quantity or content of the described objects. The use of ordinal words such as ordinal words in the embodiments of the present disclosure does not constitute a limitation on the described objects, and the description of the described objects should be seen in the context of the claims or embodiments, and should not constitute an unnecessary limitation because of the use of such prefix words. In addition, in the description of the embodiments, unless otherwise stated, the meaning of “a plurality of” is two or more.

[0052] Embodiment 1

[0053] Figure 1 A flowchart of a quantity optimization method of a photovoltaic module provided for an exemplary embodiment of the present disclosure is shown in the figure, and the method comprises:

[0054] S1, an electrical performance parameter correction value of a photovoltaic module is obtained, and the electrical performance parameter correction value includes an open circuit voltage relative temperature coefficient correction value.

[0055] S2, a series quantity range of the photovoltaic modules in a photovoltaic module string is determined based on the electrical performance parameter correction value of the photovoltaic module.

[0056] S3, the series quantity of the photovoltaic modules in the photovoltaic module string is optimized based on the series quantity range of the photovoltaic modules in the photovoltaic module string.

[0057] S4, a parallel quantity range of the photovoltaic module string is determined, and the parallel quantity of the photovoltaic module string is optimized based on the parallel quantity range of the photovoltaic module string.

[0058] In an optional embodiment, step S1 comprises:

[0059] S11, acquire irradiance at a position corresponding to the photovoltaic module.

[0060] S12, acquire an open-circuit voltage relative temperature coefficient correction value of the photovoltaic module based on the irradiance.

[0061] In an optional embodiment, the irradiance can be acquired by a sensor or acquired by meteorological information related to the irradiance, which can be acquired through a network or the like. Specifically:

[0062] The acquisition of the irradiance by the sensor includes but is not limited to the following cases: acquiring irradiance at a position corresponding to the photovoltaic module before the photovoltaic power station is built, specifically, acquiring irradiance at a position where the photovoltaic module is planned to be installed, or acquiring irradiance at a position where the photovoltaic power station is planned to be built; acquiring irradiance at a position corresponding to the photovoltaic module after the photovoltaic power station is built, specifically, acquiring irradiance at a position where the photovoltaic module is actually installed, or acquiring irradiance at a position where the photovoltaic power station is built.

[0063] The acquisition of the irradiance by the meteorological information includes but is not limited to the following cases: acquiring irradiance in a region where the photovoltaic power station is planned to be built before the photovoltaic power station is built; acquiring irradiance in a region where the photovoltaic power station is built after the photovoltaic power station is built.

[0064] By acquiring the irradiance before the photovoltaic power station is built, the number of photovoltaic modules can be optimized based on the method, so that the layout of the photovoltaic modules in the photovoltaic power station can be optimized according to the optimized number; by acquiring the irradiance after the photovoltaic power station is built, the number of photovoltaic modules can be optimized based on the method, so that the layout of the photovoltaic modules in the photovoltaic power station can be dynamically adjusted according to the optimized number. The number herein is not limited to the number of photovoltaic modules in series in a photovoltaic module string, but also includes the number of photovoltaic module strings in parallel.

[0065] In an optional embodiment, the irradiance at the position corresponding to the photovoltaic module includes but is not limited to: maximum irradiance in a preset time period, average irradiance in a preset time period, median irradiance in a preset time period, and real-time irradiance.

[0066] In an optional embodiment, the calculation formula of the open-circuit voltage relative temperature coefficient correction value is:

[0067]

[0068] wherein, K v相对 is the open-circuit voltage relative temperature coefficient correction value, is the ratio of the open-circuit voltage relative temperature coefficient correction value to the open-circuit voltage relative temperature coefficient standard value, i.e., the standardized value of the open-circuit voltage relative temperature coefficient, K v相对，STC is the open-circuit voltage relative temperature coefficient standard value.

[0069] In an optional embodiment, The calculation can be obtained by calculation.

[0070] The calculation formula is:

[0071]

[0072] Wherein, G * is the ratio of irradiance of the photovoltaic module to the standard value of irradiance, γ is a correction coefficient, and α is a correction number. γ and α can be obtained based on historical experimental data, for example, for a specific type of photovoltaic module, γ can be-0.108, and α can be 1. Referring to Figure 2 , the historical experimental data can include the corresponding relationship between the open-circuit voltage relative temperature coefficient and the irradiance, wherein different colors of points represent different types of components.

[0073] In an optional embodiment, step S1 further comprises:

[0074] S13, obtaining the working temperature of the photovoltaic module.

[0075] S14, obtaining the correction value of the electrical performance parameter of the photovoltaic module based on the working temperature and the irradiance.

[0076] In an optional embodiment, the working temperature can be obtained by a sensor, or the irradiance can be obtained by meteorological information related to the working temperature, which can be obtained based on network and other ways. Specifically:

[0077] The working temperature is obtained by a sensor (the working temperature can be set as the current environmental temperature), including but not limited to the following several cases: obtaining the working temperature at the corresponding position of the photovoltaic module before the photovoltaic power station is built, specifically, obtaining the working temperature at the position where the photovoltaic module is planned to be installed, or obtaining the working temperature at the planned position of the photovoltaic power station; obtaining the working temperature at the corresponding position of the photovoltaic module after the photovoltaic power station is built, specifically, obtaining the working temperature at the actual position of the photovoltaic module, or obtaining the working temperature of the photovoltaic power station where the photovoltaic module is located.

[0078] The working temperature is obtained by meteorological information, including but not limited to the following several cases: obtaining the working temperature of the region where the photovoltaic power station is located before the photovoltaic power station is built; obtaining the working temperature of the region where the photovoltaic power station is located after the photovoltaic power station is built.

[0079] By obtaining the working temperature of the photovoltaic power station before being built, the number of photovoltaic components can be optimized based on the method, so that the layout of the photovoltaic components in the photovoltaic power station can be optimized according to the optimized number. By obtaining the working temperature of the photovoltaic power station after being built, the number of photovoltaic components can be optimized based on the method, so that the layout of the photovoltaic components in the photovoltaic power station can be dynamically adjusted according to the optimized number. The number herein is not limited to the number of series connection of photovoltaic components in a photovoltaic component string, but also includes the number of parallel connection of photovoltaic component strings.

[0080] In an optional embodiment, the working temperature of the corresponding position of the photovoltaic component includes but is not limited to: the maximum temperature in a preset time period, the average temperature in a preset time period, the median of the temperature in a preset time period, and the real-time working temperature.

[0081] In an optional embodiment, step S14 includes:

[0082] The open-circuit voltage relative temperature coefficient correction value of the photovoltaic component is obtained based on the working temperature, the irradiance, the ideal factor, the open-circuit voltage standard value, the open-circuit voltage relative temperature coefficient standard value, and the material band gap.

[0083] In an optional embodiment, the calculation formula for obtaining the open-circuit voltage relative temperature coefficient correction value of the photovoltaic component based on the working temperature and the irradiance is:

[0084]

[0085] Wherein, K v相对 is the open-circuit voltage relative temperature coefficient correction value, is the ratio of the open-circuit voltage relative temperature coefficient correction value to the open-circuit voltage relative temperature coefficient standard value, that is, the standardized value of the open-circuit voltage relative temperature coefficient, K v相对，STC is the open-circuit voltage relative temperature coefficient standard value;

[0086] The calculation formula of is calculated based on the working temperature, the irradiance, the ideal factor, the open-circuit voltage standard value, the material band gap, and the constant related to the ideal factor.

[0087]

[0088] Wherein, n is the ideal factor, k is the Boltzmann constant, T is the working temperature, G * is the ratio of the irradiance of the photovoltaic component to the irradiance standard value, E g0 is the material band gap, V oc，STC is the open-circuit voltage standard value, and Γ is the constant related to the ideal factor.

[0089] The above ​The calculation formula can be derived from β ** The calculation formula is derived to obtain β ** The calculation formula can be derived from K. v绝对 The calculation formula and V oc (G * The calculation formula for β is derived, where β ** K is the correction ratio for the absolute temperature coefficient of open-circuit voltage. v绝对 V is the absolute temperature coefficient of open-circuit voltage. oc This is the open-circuit voltage; the specific process is as follows:

[0090] The formula for calculating the absolute temperature coefficient of open-circuit voltage is:

[0091]

[0092] Where n is the ideality factor, k is the Boltzmann constant, T is the operating temperature, and E is the operating temperature. g0 The band gap of silicon photovoltaic modules is typically 1.206 eV, where Γ is a dimensionless constant related to the ideality factor, and can be taken as 3 for silicon photovoltaic cells.

[0093] The relationship between the open-circuit voltage and irradiance of an ideal photovoltaic module is as follows:

[0094]

[0095] Where n is the ideal factor; G * This is the ratio of the irradiance of the photovoltaic module to the standard irradiance value. For example, when the irradiance of the photovoltaic module is 600W / m²... 2 The standard value for irradiance is 1000W / m². 2 At that time, G * It is 0.6.

[0096] By combining the formula for calculating the absolute temperature coefficient of open-circuit voltage with the relationship between the open-circuit voltage and irradiance of an ideal photovoltaic module, V oc Replace with V oc (G * The following calculation formula can be obtained:

[0097]

[0098] To further simplify the above formula, using k in eV / K and setting q as the elementary charge (q = 1), we can obtain β. ** The calculation formula is:

[0099]

[0100] β **The absolute temperature coefficient of open circuit voltage is normalized, i.e. compared with its actual value with the standard value, so it is called the relative temperature coefficient correction ratio of the photovoltaic module in this embodiment, and the irradiance is also normalized, i.e. the irradiance of the photovoltaic module is compared with the irradiance standard value.

[0101] Divide the numerator of the above formula by V oc (G * Divide the denominator by V oc，STC Set q as the basic charge (q = 1), use k in eV / K, and the above formula can be obtained. The calculation formula of the above formula can be obtained by derivation or β ** It can be seen from the theoretical formula of or β ** Both of them have an exponential relationship with irradiance, so they can be simplified by numerical simulation, and the calculation formula of on the numerical simulation is:

[0102]

[0103] Where G * is the ratio of the irradiance of the photovoltaic module to the irradiance standard value, γ is the correction coefficient, and α is the correction number. γ and α can be obtained based on historical experimental data.

[0104] In an optional embodiment, the number of photovoltaic modules in series in the photovoltaic module string in step S2 can range from the intersection of the following two ranges.

[0105] Range one:

[0106]

[0107] Where N is the number of photovoltaic modules in series, V dcmax is the maximum input voltage of the inverter, V oc is the open circuit voltage, t is the extreme low temperature value under the working condition of the photovoltaic module, K v相对 is the open circuit voltage relative temperature coefficient correction value, and the open circuit voltage V oc can adopt a standard value.

[0108] Range two:

[0109]

[0110] Where N is the number of photovoltaic modules in series in the photovoltaic module string, V mpptmax is the maximum voltage of the maximum power point of the inverter, V mpptmin is the minimum voltage of the maximum power point of the inverter, and V pmis the working voltage of the photovoltaic module, t is the extreme low temperature value under the working condition of the photovoltaic module, t' is the extreme high temperature value under the working condition of the photovoltaic module, K' is the working voltage relative temperature coefficient of the photovoltaic module v相对 is the working voltage relative temperature coefficient of the photovoltaic module.

[0111] In an optional embodiment, step S3 includes but is not limited to the following ways:

[0112] In the construction phase of the photovoltaic power station, if the series number of the photovoltaic modules in the photovoltaic module string of the photovoltaic power station can be dynamically adjusted, a higher series number can be selected from the series number range to construct the photovoltaic power station, so that after the photovoltaic power station is completed, the series number can be dynamically adjusted in a larger number range.

[0113] In the construction phase of the photovoltaic power station, if the series number of the photovoltaic modules can be dynamically adjusted, the irradiance can be obtained in real time, the series number range can be calculated, and the maximum value in the series number range can be selected as the series number of the photovoltaic modules in the photovoltaic module string, so that the power generation efficiency of the photovoltaic power station can be improved.

[0114] In an optional embodiment, step S4 specifically includes:

[0115] S41, determining the parallel number range of the photovoltaic module string based on the current value of the photovoltaic module string and the maximum input current of the inverter, the inverter being electrically connected with the photovoltaic module string.

[0116] The specific calculation method is that the product of the parallel number of the photovoltaic module string and the current value of the photovoltaic module string should be not greater than the maximum input current of the inverter.

[0117] S42, optimizing the parallel number of the photovoltaic module string based on the parallel number range of the photovoltaic module string.

[0118] In an optional embodiment, step S42 includes but is not limited to the following ways:

[0119] In the construction phase of the photovoltaic power station, if the parallel number of the photovoltaic module string of the photovoltaic power station can be dynamically adjusted, a higher parallel number can be selected from the parallel number range to construct the photovoltaic power station, so that after the photovoltaic power station is completed, the parallel number can be dynamically adjusted in a larger number range.

[0120] In the construction phase of the photovoltaic power station, if the parallel number of the photovoltaic module string can be dynamically adjusted, the irradiance can be obtained in real time, the parallel number range can be calculated, and the maximum value in the parallel number range can be selected as the parallel number of the photovoltaic module string, so that the power generation efficiency of the photovoltaic power station can be improved.

[0121] In an optional embodiment, Figure 3The application relates to a quantity adjusting circuit for a photovoltaic module, the series quantity of the photovoltaic modules in a photovoltaic module string of a photovoltaic power station can be dynamically adjusted by the quantity adjusting circuit, and the parallel quantity of the photovoltaic module strings can also be adjusted by the quantity adjusting circuit, and the quantity adjusting circuit can also be adaptively set according to practice.

[0122] In the quantity adjusting circuit, each photovoltaic module is connected in parallel with a short-circuit switch, when the series quantity of the photovoltaic modules needs to be reduced, a corresponding quantity of the short-circuit switches is closed, and when the series quantity of the photovoltaic modules needs to be increased, a corresponding quantity of the short-circuit switches is opened.

[0123] In the quantity adjusting circuit, each photovoltaic module string is connected in parallel with a selection switch, when the parallel quantity of the photovoltaic module strings needs to be reduced, a corresponding quantity of the short-circuit switches is opened, and when the parallel quantity of the photovoltaic module strings needs to be increased, a corresponding quantity of the short-circuit switches is closed.

[0124] The following is an example of application of the method: the open-circuit voltage V oc of the photovoltaic module is 36.7 V, the absolute temperature coefficient of the open-circuit voltage of the photovoltaic module is -0.123 V / ℃, the relative temperature coefficient of the open-circuit voltage of the photovoltaic module is -0.45% / ℃, the standard working temperature is 25℃, the limit low temperature value under the working condition of the photovoltaic module is -30℃, the limit high temperature value under the working condition of the photovoltaic module is 65℃, and the maximum input voltage of the inverter is 1000 V.

[0125] Based on the above parameters, in the prior art, when the relative temperature coefficient of the open-circuit voltage is not corrected, the following can be obtained:

[0126]

[0127] If the obtained irradiance is 600 W / m 2 , the correction number z is 1, gamma is -0.108, and the following can be calculated:

[0128]

[0129] K v相对 = 1.0551 * (-0.0045) = -0.0047 = -0.47% / ℃

[0130] If the calculated correction value of the relative temperature coefficient of the open-circuit voltage is K v相对 = -0.47% / ℃, the following can be calculated:

[0131]

[0132] Therefore, the calculation result N <= 21.84 is corrected to N <= 21.65.

[0133] Further, if the maximum voltage of the maximum power point of the inverter is 850V, the minimum voltage of the maximum power point of the inverter is 420V, the working voltage of the photovoltaic module is 29.2V, and the relative temperature coefficient of the working voltage of the photovoltaic module is -0.43% / ℃, the following can be calculated:

[0134]

[0135] If the intersection of the first serial number range N≤21.84 in the prior art is taken, the serial number range is 17.37≤N≤21.84; if the intersection of the first serial number range N≤21.65 after correction is taken, a more accurate serial number range 17.37≤N≤21.65 can be finally obtained.

[0136] The open-circuit voltage relative temperature coefficient correction value of the photovoltaic module is obtained, and the serial number of the photovoltaic module in the photovoltaic module string can be more accurately configured, and the parallel number of the photovoltaic module string can be more accurately configured.

[0137] Embodiment 2

[0138] Based on the embodiment 1, referring to Figure 4 The present example embodiment provides another flowchart of the number optimization method of the photovoltaic module, which comprises:

[0139] S1, obtaining an electrical performance parameter correction value of the photovoltaic module, the electrical performance parameter correction value comprising an open-circuit voltage relative temperature coefficient correction value and an open-circuit voltage correction value.

[0140] S2, determining a serial number range of the photovoltaic module in the photovoltaic module string based on the electrical performance parameter correction value of the photovoltaic module.

[0141] S3, optimizing the serial number of the photovoltaic module in the photovoltaic module string based on the serial number range of the photovoltaic module in the photovoltaic module string.

[0142] S4, determining a parallel number range of the photovoltaic module string, and optimizing the parallel number of the photovoltaic module string based on the parallel number range of the photovoltaic module string.

[0143] In an optional embodiment, step S1 specifically comprises:

[0144] The open-circuit voltage correction value of the photovoltaic module is obtained based on the irradiance of the photovoltaic module, the irradiance standard value, the working temperature, the working temperature standard value, and the open-circuit voltage standard value.

[0145] In an optional embodiment, the calculation formula for obtaining the open-circuit voltage correction value of the photovoltaic module based on the irradiance of the photovoltaic module, the irradiance standard value, the working temperature, the working temperature standard value, and the open-circuit voltage standard value is:

[0146] V oc (T,G) = V oc，STC (T STC , G STC ) + K v绝对 (T-T STC ) +∑a i (G-G STC ) i

[0147] wherein V oc is the open-circuit voltage correction value, V oc,STC (T STC , G STC ) is the open-circuit voltage standard value, T is the working temperature, T STC is the working temperature standard value, G is the irradiance, G STC is the irradiance standard value, K v绝对 is the open-circuit voltage absolute temperature coefficient, a i is the correction coefficient, and i is a positive integer. The correction coefficient can be obtained based on historical experimental data, which can include the corresponding relationship between the open-circuit voltage and each variable in the above formula.

[0148] Preferably, although the larger the value of i, the more accurate the calculation, but in order to balance the calculation accuracy and complexity, the value of i is 2, and the calculation formula for obtaining the open-circuit voltage correction value of the photovoltaic module based on the irradiance of the photovoltaic module, the irradiance standard value, the working temperature, the working temperature standard value and the open-circuit voltage standard value is:

[0149] V oc (T,G) = V oc，STC (T STC , G STC ) + K v绝对 (T-T STC ) + a1(G-G STC ) + a2(G-G STC ) 2

[0150] wherein a1 and a2 are correction coefficients. The correction coefficient can be obtained based on historical experimental data, which can include the corresponding relationship between the open-circuit voltage and each variable in the above formula.

[0151] In an alternative embodiment, the calculation formula for obtaining the open-circuit voltage correction value of the photovoltaic module based on the irradiance of the photovoltaic module, the irradiance standard value, the working temperature, the working temperature standard value and the open-circuit voltage standard value is:

[0152]

[0153] wherein V oc is the open-circuit voltage correction value, Voc，STC is a standard value of open circuit voltage, T is a working temperature, T STC is a standard value of working temperature, G is irradiance, G STC is a standard value of irradiance, K v绝对 is an absolute temperature coefficient of open circuit voltage, c j is a correction coefficient, j is a positive integer. The correction coefficient can be obtained based on historical experimental data, which can include a corresponding relationship between open circuit voltage and each variable in the above formula.

[0154] Preferably, although the larger the value of j, the more accurate the calculation, but to balance the calculation accuracy and complexity, the value of j is 3, and the calculation formula for obtaining the open circuit voltage correction value of the photovoltaic module based on the irradiance of the photovoltaic module, the irradiance standard value, the working temperature, the working temperature standard value, and the open circuit voltage standard value is:

[0155]

[0156] wherein c1, c2, and c3 are correction coefficients. The correction coefficients can be obtained based on historical experimental data, which can include a corresponding relationship between open circuit voltage and each variable in the above formula.

[0157] In an optional embodiment, the determination of the range of the number of photovoltaic modules in series in the photovoltaic module string in step S3 is as follows:

[0158]

[0159] wherein N is the number of photovoltaic modules in series, V dcmax is the maximum input voltage of the inverter, V oc is the open circuit voltage correction value, t is the limit low temperature value under the working condition of the photovoltaic module, K v相对 is the open circuit voltage relative temperature coefficient correction value.

[0160] An example of applying the method is as follows: the open circuit voltage V oc of the photovoltaic module is 36.7V, the open circuit voltage relative temperature coefficient of the photovoltaic module is -0.45% / ℃, the standard working temperature is 25℃, the limit low temperature value under the working condition of the photovoltaic module is -30℃, the limit high temperature value under the working condition of the photovoltaic module is 65℃, and the maximum input voltage of the inverter is 1000V.

[0161] Based on the above parameters, in the prior art, without correction of the open circuit voltage relative temperature coefficient and the open circuit voltage, the following can be obtained:

[0162]

[0163] If the obtained irradiance is 600W / m2 , the correction coefficient z is 1 and the correction coefficient γ is -0.108, the following can be calculated:

[0164]

[0165] K v相对 = 1.0551 * (-0.0045) = -0.0047 = -0.47% / °C

[0166] If the correction coefficient a1 is 0.001181, the correction coefficient a2 is -0.18544, the correction coefficient c1 is 0.05468511, the correction coefficient c2 is -0.005973869, and the correction coefficient c3 is 0.000761678, the following can be calculated respectively by using the above calculation formula of the open circuit voltage correction value:

[0167]

[0168] Based on the open circuit voltage relative temperature coefficient correction value K v相对 = -0.47% / °C and the open circuit voltage correction value (approximately two decimal places) V oc = 34.82V, the following can be calculated:

[0169]

[0170] Therefore, the calculation result N≤21.84 is corrected to N≤22.82.

[0171] Further, if the maximum voltage of the maximum power point of the inverter is 850V, the minimum voltage of the maximum power point of the inverter is 420V, the working voltage of the photovoltaic module is 29.2V, and the working voltage relative temperature coefficient of the photovoltaic module is -0.43% / °C, the following can be calculated:

[0172]

[0173] If the intersection of the first series number range N≤21.84 in the prior art is taken, the series number range obtained is 17.37≤N≤21.84; if the intersection of the first series number range N≤21.82 after correction is taken, a more accurate series number range 17.37≤N≤22.82 can be finally obtained.

[0174] By correcting the number range of photovoltaic modules in the photovoltaic module string to 17.37≤N≤22.82, when dynamically adjusting the number of photovoltaic modules of the photovoltaic power station, the number of photovoltaic modules in series in the photovoltaic module string can be adjusted to 22, thereby the voltage after series connection can be improved, the DC line loss can be reduced, and thus the efficiency and capacity ratio of the photovoltaic power generation system are improved. In addition, since a certain input voltage and power level need to be reached for starting the inverter, if the voltage of the photovoltaic module string is high, the inverter can be started earlier even if the morning light is weak. Similarly, when the light gradually weakens in the evening, the higher voltage delays the shutdown time of the inverter, thereby improving the working time of the inverter and the power generation efficiency of the photovoltaic power station.

[0175] By obtaining the open-circuit voltage relative temperature coefficient correction value and the open-circuit voltage correction value of the photovoltaic module, the number of photovoltaic modules in series in the photovoltaic module string can be more accurately configured, and thus the number of photovoltaic module strings in parallel can be more accurately configured.

[0176] Embodiment 3

[0177] With reference to Figure 5 An example embodiment of the present disclosure provides a flowchart of another photovoltaic module number optimization method, which comprises:

[0178] S1, obtaining an electrical performance parameter correction value of a photovoltaic module, the electrical performance parameter correction value comprising an open-circuit voltage correction value.

[0179] S2, determining a series number range of photovoltaic modules in a photovoltaic module string based on the electrical performance parameter correction value of the photovoltaic module.

[0180] S3, optimizing the series number of photovoltaic modules in the photovoltaic module string based on the series number range of photovoltaic modules in the photovoltaic module string.

[0181] S4, determining a parallel number range of photovoltaic module strings, and optimizing the parallel number of photovoltaic module strings based on the parallel number range of photovoltaic module strings.

[0182] In an optional embodiment, step S1 specifically comprises:

[0183] The open-circuit voltage correction value of the photovoltaic module is obtained based on the irradiance, the irradiance standard value, the working temperature, the working temperature standard value, and the open-circuit voltage standard value of the photovoltaic module.

[0184] In an optional embodiment, the calculation formula for obtaining the open-circuit voltage correction value of the photovoltaic module based on the irradiance, the irradiance standard value, the working temperature, the working temperature standard value, and the open-circuit voltage standard value of the photovoltaic module is:

[0185] V oc (T,G)=V oc，STC (T STC , GSTC )+K v绝对 (T-T STC )+∑a i (G-G STC ) i

[0186] wherein V oc is the open-circuit voltage correction value, V oc，STC (T STC , G STC ) is the open-circuit voltage standard value, T is the working temperature, T STC is the working temperature standard value, G is the irradiance, G STC is the irradiance standard value, K v绝对 is the open-circuit voltage absolute temperature coefficient, a i is the correction coefficient, and i is a positive integer. The correction coefficient can be obtained based on historical experimental data, which can include the corresponding relationship between the open-circuit voltage and each variable in the above formula.

[0187] Preferably, although the larger the value of i is, the more accurate the calculation is, but in order to balance the calculation accuracy and complexity, the value of i is 2, and the calculation formula for obtaining the open-circuit voltage correction value of the photovoltaic module based on the irradiance of the photovoltaic module, the irradiance standard value, the working temperature, the working temperature standard value and the open-circuit voltage standard value is:

[0188] V oc (T,G) = V oc，STC (T STC , G STC )+K v绝对 (T-T STC )+a1(G-G STC )+a2(G-G STC ) 2

[0189] wherein a1 and a2 are correction coefficients. The correction coefficient can be obtained based on historical experimental data, which can include the corresponding relationship between the open-circuit voltage and each variable in the above formula.

[0190] In an alternative embodiment, the calculation formula for obtaining the open-circuit voltage correction value of the photovoltaic module based on the irradiance of the photovoltaic module, the irradiance standard value, the working temperature, the working temperature standard value and the open-circuit voltage standard value is:

[0191]

[0192] wherein V oc is the open-circuit voltage correction value, V oc，STC is the open-circuit voltage standard value, T is the working temperature, T STC is the working temperature standard value, G is the irradiance, GSTC is a standard value of irradiance, K v绝对 is an absolute temperature coefficient of open circuit voltage or an absolute temperature coefficient of open circuit voltage correction value, c j is a correction coefficient, and j is a positive integer. The correction coefficient can be obtained based on historical experimental data, which can include a corresponding relationship between the open circuit voltage and each variable in the above formula.

[0193] Preferably, although the larger the value of j, the more accurate the calculation, but to balance the calculation accuracy and complexity, the value of j is 3, and the calculation formula for obtaining the open circuit voltage correction value of the photovoltaic module based on the irradiance of the photovoltaic module, the standard value of irradiance, the working temperature, the standard value of working temperature, and the standard value of open circuit voltage is:

[0194]

[0195] wherein c1, c2, and c3 are correction coefficients. The correction coefficients can be obtained based on historical experimental data, which can include a corresponding relationship between the open circuit voltage and each variable in the above formula.

[0196] In an optional embodiment, the range of the number of photovoltaic modules in series in the photovoltaic module string in step S2 can be the intersection of the following two ranges.

[0197] Range I:

[0198]

[0199] wherein N is the number of photovoltaic modules in series, V dcmax is the maximum input voltage of the inverter, V oc is the open circuit voltage correction value, t is the limit low temperature value under the working condition of the photovoltaic module, K v相对 is the relative temperature coefficient of open circuit voltage, the open circuit voltage V oc The standard value can be used.

[0200] Range II:

[0201]

[0202] wherein N is the number of photovoltaic modules in series in the photovoltaic module string, V mpptmax is the maximum voltage of the maximum power point of the inverter, V mpptmin is the minimum voltage of the maximum power point of the inverter, V pm is the working voltage of the photovoltaic module, t is the limit low temperature value under the working condition of the photovoltaic module, t' is the limit high temperature value under the working condition of the photovoltaic module, K' v相对 is the relative temperature coefficient of the working voltage of the photovoltaic module.

[0203] In an optional embodiment, step S3 includes but is not limited to the following ways:

[0204] In the construction phase of the photovoltaic power station, if the series number of the photovoltaic modules in the photovoltaic module string of the photovoltaic power station can be dynamically adjusted, a higher series number in the series number range can be selected to construct the photovoltaic power station, so that after the photovoltaic power station is completed, dynamic adjustment can be performed in a larger number range.

[0205] In the construction phase of the photovoltaic power station, if the series number of the photovoltaic modules in the photovoltaic module string of the photovoltaic power station can be dynamically adjusted, the irradiance can be obtained in real time, the series number range is calculated, and the maximum value in the series number range is selected as the series number of the photovoltaic modules in the photovoltaic module string, so that the power generation efficiency of the photovoltaic power station can be improved.

[0206] In an optional embodiment, step S4 specifically includes:

[0207] S41, determining a parallel number range of the photovoltaic module string based on the current value of the photovoltaic module string and the maximum input current of the inverter, the inverter being electrically connected with the photovoltaic module string.

[0208] The specific calculation method is that the product of the parallel number of the photovoltaic module string and the current value of the photovoltaic module string should be not greater than the maximum input current of the inverter.

[0209] S42, optimizing the parallel number of the photovoltaic module string based on the parallel number range of the photovoltaic module string.

[0210] In an optional embodiment, step S42 includes but is not limited to the following ways:

[0211] In the construction phase of the photovoltaic power station, if the parallel number of the photovoltaic module string of the photovoltaic power station can be dynamically adjusted, a higher parallel number in the parallel number range can be selected to construct the photovoltaic power station, so that after the photovoltaic power station is completed, dynamic adjustment can be performed in a larger number range.

[0212] In the construction phase of the photovoltaic power station, if the parallel number of the photovoltaic module string of the photovoltaic power station can be dynamically adjusted, the irradiance can be obtained in real time, the parallel number range is calculated, and the maximum value in the parallel number range is selected as the parallel number of the photovoltaic module string, so that the power generation efficiency of the photovoltaic power station can be improved.

[0213] In an optional embodiment, Figure 3 A photovoltaic module number adjustment circuit, the series number of the photovoltaic modules in the photovoltaic module string of the photovoltaic power station can be dynamically adjusted by the number adjustment circuit, and the parallel number of the photovoltaic module string can also be adjusted by the number adjustment circuit, and those skilled in the art can also make adaptive settings according to practice.

[0214] In the number adjustment circuit, each photovoltaic component is connected in parallel with a short-circuit switch, when the number of photovoltaic components in series needs to be reduced, the corresponding number of short-circuit switches is closed, and when the number of photovoltaic components in series needs to be increased, the corresponding number of short-circuit switches is opened.

[0215] And in the number adjustment circuit, each photovoltaic component string is connected to the inverter through a selection switch, when the number of photovoltaic component strings in parallel needs to be reduced, the corresponding number of short-circuit switches is opened, and when the number of photovoltaic component strings in parallel needs to be increased, the corresponding number of short-circuit switches is closed.

[0216] An example of applying the method is as follows: the open-circuit voltage V oc of the photovoltaic component is 36.7V, the absolute temperature coefficient of the open-circuit voltage of the photovoltaic component is -0.123V / ℃, the relative temperature coefficient of the open-circuit voltage of the photovoltaic component is -0.45% / ℃, the standard working temperature is 25℃, the limit low temperature value under the working condition of the photovoltaic component is -30℃, the limit high temperature value under the working condition of the photovoltaic component is 65℃, and the maximum input voltage of the inverter is 1000V.

[0217] Based on the above parameters, in the prior art, when the relative temperature coefficient of the open-circuit voltage is not corrected, the following can be obtained:

[0218]

[0219] If the obtained irradiance is 600W / m 2 , the correction coefficients a1=0.001181, a2=-0.18544, c1=0.05468511, c2=-0.005973869, and c3=0.000761678 can be obtained, and the open-circuit voltage correction value can be calculated by the above calculation formula.

[0220]

[0221] Based on the open-circuit voltage correction value (approximately two decimal places) V oc =34.82V, the following can be obtained:

[0222]

[0223] Therefore, the calculation result N≤21.84 is corrected to N≤23.02.

[0224] Further, if the maximum voltage of the maximum power point of the inverter is 850V, the minimum voltage of the maximum power point of the inverter is 420V, the working voltage of the photovoltaic component is 29.2V, and the relative temperature coefficient of the working voltage of the photovoltaic component is -0.43%℃, the following can be calculated:

[0225]

[0226] If the intersection of the first series number range N≤21.84 in the prior art is taken, the series number range is 17.37≤N≤21.84; if the intersection of the first series number range N≤23.02 after correction is taken, the more accurate series number range 17.37≤N≤23.02 can be finally obtained.

[0227] By correcting the photovoltaic module number range in the photovoltaic string to 17.37≤N≤23.02, when the number of photovoltaic modules in the photovoltaic power station is dynamically adjusted, the number of photovoltaic modules in the photovoltaic string can be adjusted to 22 or 23 according to the actual situation, thereby the voltage after series connection can be improved, the DC line loss can be reduced, the photovoltaic power generation system efficiency and the capacity ratio can be improved, and because the inverter needs to reach a certain input voltage and power level to start, if the voltage of the photovoltaic string is high, the inverter can start earlier even if the morning light is weak, and at the same time, when the light gradually weakens in the evening, the higher voltage delays the inverter shutdown time, thereby improving the working time of the inverter and the power generation efficiency of the photovoltaic power station.

[0228] The open circuit voltage correction value of the photovoltaic module is obtained in the embodiment of the present disclosure, the series number of the photovoltaic module in the photovoltaic string can be more accurately configured, and the parallel number of the photovoltaic string can be more accurately configured.

[0229] Embodiment 4

[0230] Figure 6 A structural schematic diagram of an electronic device is shown for an example embodiment of the present disclosure, the electronic device includes a memory, a processor and a computer program stored on the memory and used for running on the processor, and the processor implements the photovoltaic module number optimization method of any of the above embodiments when executing the computer program. Figure 6 The displayed electronic device 90 is only an example, and should not bring any limitation to the function and use range of the embodiments of the present disclosure.

[0231] As shown in Figure 6 The electronic device 90 can be in the form of a general computing device, for example, it can be a server device. The components of the electronic device 90 can include but are not limited to the above-mentioned at least one processor 91, the above-mentioned at least one memory 92, a bus 93 connecting different system components including the memory 92 and the processor 91.

[0232] The bus 93 includes a data bus, an address bus and a control bus.

[0233] The memory 92 can include a volatile memory, such as a random access memory (RAM) 921 and / or a cache memory 922, and can further include a read-only memory (ROM) 923.

[0234] The memory 92 can also include a program tool 925 (or utility) having a set (at least one) of program modules 924, including but not limited to: an operating system, one or more applications, other program modules, and program data, and each of these examples, or some combination thereof, can include implementation of a network environment.

[0235] The processor 91 performs various function applications and data processing by running the computer program stored in the memory 92, such as the number optimization method of the photovoltaic module provided by any of the above embodiments.

[0236] The electronic device 90 can also communicate with one or more external devices 94 (such as a keyboard, a pointing device, etc.) via an input / output (I / O) interface 95. Also, the electronic device 90 can communicate with one or more networks (such as a local area network (LAN), a wide area network (WAN), and / or a public network, such as the Internet) via a network adapter 96. As illustrated, the network adapter 96 communicates with the other modules of the electronic device 90 via the bus 93. It should be appreciated that the network adapter 96 can also be connected to the other modules of the electronic device 90 in some other manner, such as via a wireless media, etc. Figure 6 It should be appreciated that other hardware and / or software modules can be used in conjunction with the electronic device 90, as indicated in the above detailed description, including but not limited to: microcode, device drivers, redundant processors, external disk drive arrays, RAID (Redundant Array of Independent Disks) systems, tape drives, and data backup storage systems, etc.

[0237] It should be noted that although several units / modules or sub-units / modules of the electronic device are mentioned in the above detailed description, such division is merely exemplary and not mandatory. In fact, according to the embodiments of the present 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 into multiple units / modules.

[0238] Embodiment 5

[0239] The embodiments of the present disclosure also provide a computer readable storage medium, which stores a computer program, and the program is executed by a processor to implement the number optimization method of the photovoltaic module provided by any of the above embodiments.

[0240] Among them, the more specific readable storage medium can include but is 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 of the above.

[0241] Embodiment 6

[0242] The embodiment of the present disclosure further provides a computer program product comprising a computer program, which, when executed by a processor, implements the quantity optimization method of the photovoltaic module according to any one of the above.

[0243] The program code of the computer program product of the present disclosure can be written in any combination of one or more programming languages, and can be executed entirely on the user device, partially on the user device, as a standalone software package, partially on the user device and partially on a remote device, or entirely on a remote device.

[0244] Although the specific embodiments of the present disclosure are described above, those skilled in the art should understand that this is only an illustration, and the protection scope of the present 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 the present disclosure, and these changes and modifications all fall within the protection scope of the present disclosure.

Claims

1. A method for optimizing the number of photovoltaic modules, characterized in that, include: Obtain corrected values ​​for the electrical performance parameters of the photovoltaic module, including corrected values ​​for open-circuit voltage and / or corrected values ​​for the relative temperature coefficient of open-circuit voltage; The range of the number of photovoltaic modules connected in series in a photovoltaic string is determined based on the correction values ​​of the electrical performance parameters of the photovoltaic modules. The number of photovoltaic modules connected in series in the photovoltaic string is optimized based on the range of the number of photovoltaic modules connected in series in the photovoltaic string; Determine the range of the number of photovoltaic strings connected in parallel, and optimize the number of photovoltaic strings connected in parallel based on the range of the number of photovoltaic strings connected in parallel.

2. The quantity optimization method as described in claim 1, characterized in that, The electrical performance parameter correction values ​​include the open-circuit voltage relative temperature coefficient correction values, and the steps for obtaining the electrical performance parameter correction values ​​of the photovoltaic module specifically include: Obtain the irradiance at the corresponding location of the photovoltaic module; The open-circuit voltage relative temperature coefficient correction value of the photovoltaic module is obtained based on the irradiance.

3. The quantity optimization method as described in claim 2, characterized in that, The calculation formula for obtaining the correction value of the electrical performance parameters of the photovoltaic module based on the irradiance is as follows: Among them, K v相对 This is the correction value for the relative temperature coefficient of the open-circuit voltage. K is the ratio of the corrected value of the relative temperature coefficient of open-circuit voltage to the standard value of the relative temperature coefficient of open-circuit voltage. v相对，STC This is the standard value of the relative temperature coefficient of open-circuit voltage; The calculation formula is: Among them, G * γ is the ratio of the irradiance of the photovoltaic module to the standard value of irradiance, γ is the correction coefficient, and α is the correction constant; or, The calculation formula is: Where n is the ideality factor, k is the Boltzmann constant, T is the operating temperature, G* is the ratio of the irradiance of the photovoltaic module to the standard value of irradiance, Eg0 is the material band gap, Voc, STC is the standard value of open circuit voltage, and Γ is a constant related to the ideality factor.

4. The quantity optimization method as described in any one of claims 1-3, characterized in that, The electrical performance parameter correction values ​​include open-circuit voltage correction values, and the steps for obtaining the electrical performance parameter correction values ​​of the photovoltaic module specifically include: The open-circuit voltage correction value of the photovoltaic module is obtained based on the irradiance, standard irradiance value, operating temperature, standard operating temperature value, and standard open-circuit voltage value of the photovoltaic module.

5. The quantity optimization method as described in claim 4, characterized in that, The calculation formula for obtaining the open-circuit voltage correction value of the photovoltaic module based on the irradiance, standard irradiance value, operating temperature, standard operating temperature value, and standard open-circuit voltage value of the photovoltaic module is as follows: V oc (T,G)=V oc，STC (T STC ,G STC )+K v绝对 (T-T STC )+∑a i (G-G STC ) i Among them, V oc V is the open-circuit voltage correction value. oc,STC (T STC G STC ) represents the standard value of open-circuit voltage, and T represents the operating temperature. STC G represents the standard operating temperature, and G represents the irradiance. STC K is the standard value for irradiance. v绝对 Let a be the absolute temperature coefficient of the open-circuit voltage. i The correction factor is i, where i is a positive integer; or, The calculation formula for obtaining the open-circuit voltage correction value of the photovoltaic module based on the irradiance, standard irradiance value, operating temperature, standard operating temperature value, and standard open-circuit voltage value of the photovoltaic module is as follows: 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 K is the standard value for irradiance. v绝对 Let c be the absolute temperature coefficient of the open-circuit voltage. j is the correction coefficient, and j is a positive integer.

6. The quantity optimization method as described in claim 1, characterized in that, The step of determining the range of the number of photovoltaic strings connected in parallel includes: The range of the number of photovoltaic strings connected in parallel is determined based on the current value of the photovoltaic strings and the maximum input current of the inverter, and the inverter is used to be electrically connected to the photovoltaic strings. The number of photovoltaic strings connected in parallel is optimized based on the range of the number of photovoltaic strings connected in parallel.

7. The quantity optimization method as described in claim 1, characterized in that, The irradiance at the location corresponding to the photovoltaic module includes any one of the following: 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.

8. An electronic device comprising a memory, a processor, and a computer program stored in the memory and for running on the processor, characterized in that, When the processor executes the computer program, it implements the method for optimizing the number of photovoltaic modules as described in any one of claims 1 to 7.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the method for optimizing the number of photovoltaic modules as described in any one of claims 1 to 7.

10. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by the processor, it implements the method for optimizing the number of photovoltaic modules as described in any one of claims 1 to 7.

Images