Maximum power point tracking method and device of photovoltaic module, photovoltaic module and related computer equipment

Abstract

The embodiment of the invention provides a maximum power point tracking method and device of a photovoltaic module, the photovoltaic module and related computer equipment, and relates to the technical field of photovoltaic [DT1]. The maximum power point tracking method of the photovoltaic module comprises the following steps: constructing a coordinate system, and establishing a current-voltage characteristic curve of the photovoltaic module in the coordinate system; determining the coordinate position of the maximum power point based on the current-voltage characteristic curve; and determining the maximum power value of the photovoltaic module based on the coordinate position. According to the embodiment of the invention, the maximum power point is determined based on the current-voltage characteristic curve of the photovoltaic module, and the result is not affected by the external environment, has more accurate reference value, and is closer to the real maximum power value of the photovoltaic module, so that the generated power after adjustment of the photovoltaic module is closer to the real maximum power value of the photovoltaic module, and the generation efficiency of the photovoltaic module is improved. And the power generation efficiency of the photovoltaic module can be further improved.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of photovoltaic technology, and in particular to a maximum power point tracking method and device for a photovoltaic module, a photovoltaic module, and related computer equipment. Background Art

[0002] In a photovoltaic module, its maximum power point is determined, and the angle of the photovoltaic module is adjusted to track the maximum power point so that the power generation power of the photovoltaic module is close to the maximum power point, thereby ensuring that the power generation efficiency of the photovoltaic module is maximized.

[0003] At present, the maximum tracking point technologies used for photovoltaic modules include: Constant Voltage Tracking (CVT), Perturbation and Observation Method (P&O), Incremental Conductance Method (INC), and incremental conductivity method based on gradient variable step length. The maximum power points obtained by these methods vary based on the influence of the external environment of the photovoltaic module, and the test environment and application environment of the photovoltaic module are quite different. Therefore, the maximum power point obtained by the test deviates from the actual application environment, which affects the tracking effect and causes the power generation power of the photovoltaic module to deviate from the maximum power point.

[0004] It should be noted that the above content is not necessarily prior art, nor is it intended to limit the scope of patent protection of this application. Summary of the invention

[0005] The embodiments of the present application provide a maximum power point tracking method and device for a photovoltaic module, a photovoltaic module and related computer equipment to solve or alleviate one or more of the technical problems mentioned above.

[0006] In a first aspect of an embodiment of the present application, a maximum power point tracking method for a photovoltaic assembly is provided, the method comprising: Construct a coordinate system and establish the current-voltage characteristic curve of the photovoltaic module in the coordinate system; Based on the current-voltage characteristic curve, determine the coordinate position of the maximum power point; Based on the coordinate position, the maximum power value of the PV module is determined.

[0007] In one embodiment, a coordinate system is constructed, and a current-voltage characteristic curve of a photovoltaic module is established in the coordinate system, including: Acquire multiple sets of current-voltage ordered pairs of photovoltaic components under different loads; each set of current-voltage ordered pairs includes a current value and a voltage value corresponding to the current value; Based on multiple sets of current-voltage ordered pairs, the current-voltage characteristic curve is obtained by fitting.

[0008] In one embodiment, multiple sets of current-voltage ordered pairs of photovoltaic components under different loads are obtained, including: obtaining multiple sets of current-voltage ordered pairs of photovoltaic components under different loads at intervals of a preset duration to update the current-voltage characteristic curve.

[0009] In one embodiment, the number of the plurality of sets of current-voltage ordered pairs is 8-18 sets.

[0010] In one implementation, determining the coordinate position of the maximum power point based on the current-voltage characteristic curve includes: Based on the current-voltage characteristic curve, determine the short-circuit current and open-circuit voltage; Determining a first tangent line of the short-circuit current with respect to the current-voltage characteristic curve, and a second tangent line of the open-circuit voltage with respect to the current-voltage characteristic curve; Based on the first tangent line and the second tangent line, the coordinate position of the maximum power point is determined.

[0011] In one implementation, determining the coordinate position of the maximum power point based on the first tangent and the second tangent includes: Construct a parallelogram based on the first and second tangents and the origin of the coordinate system; Based on the diagonal line including the origin in the parallelogram, the intersection point of the diagonal line and the current-voltage characteristic curve is determined as the coordinate position of the maximum power point.

[0012] In one embodiment, determining the maximum power value of a photovoltaic component based on the coordinate position includes: Determining a first tangent angle of the first tangent line relative to the voltage coordinate axis based on the first tangent line; determining a second tangent angle of the second tangent relative to the current coordinate axis based on the second tangent; Based on the first cutting angle and the second cutting angle, determining a target inclination angle of the diagonal line relative to the voltage coordinate axis or the current coordinate axis; The maximum power value of the photovoltaic assembly is determined based on the target tilt angle, the first cutting angle, the second cutting angle, the short-circuit current and the open-circuit voltage.

[0013] In one embodiment, determining the maximum power value of the photovoltaic assembly based on the target tilt angle, the first cutting angle, the second cutting angle, the short-circuit current and the open-circuit voltage includes: Based on the multiple sets of current-voltage ordered number pairs, multiple sets of tilt angle-voltage ordered number pairs are obtained, wherein the tilt angle-voltage ordered number pairs include the tilt angle and the voltage value corresponding to the tilt angle; Based on multiple groups of tilt angle-voltage ordered pairs, a tilt angle-voltage characteristic curve is obtained; Based on the target tilt angle and the tilt angle-voltage characteristic curve, determining that the voltage corresponding to the target tilt angle is the target voltage corresponding to the maximum power value; Determine the target current corresponding to the maximum power value based on the current-voltage characteristic curve and the target voltage; According to the target voltage and target current, the maximum power value of the photovoltaic module is obtained.

[0014] In one embodiment, determining the coordinate value of the maximum power point based on the target tilt angle, the first cutting angle, the second cutting angle, the short-circuit current and the open-circuit voltage includes: Based on the current-voltage characteristic curve, determining an inclination angle-coordinate comparison table, the inclination angle-coordinate comparison table including a plurality of inclination angles and coordinates corresponding to the inclination angles; Look up the inclination angle-coordinate comparison table to determine the coordinate value corresponding to the target inclination angle.

[0015] In one embodiment, it further includes: Get the current power value of the photovoltaic module; The maximum power value is compared with the current power value. When the difference between the maximum power value and the current power value exceeds a preset threshold range, the angle of the photovoltaic module is adjusted to adjust the difference between the current power value and the maximum power value of the photovoltaic module to be within the preset threshold range.

[0016] A second aspect of an embodiment of the present application provides a maximum power point tracking device for a photovoltaic module, comprising: A curve construction module is used to construct a coordinate system and establish a current-voltage characteristic curve of a photovoltaic module in the coordinate system; A coordinate position determination module, used to determine the coordinate position of the maximum power point based on the current-voltage characteristic curve; The maximum power value determination module is used to determine the maximum power value of the photovoltaic component based on the coordinate position.

[0017] A third aspect of the embodiments of the present application provides a photovoltaic system, comprising a photovoltaic component, a photovoltaic bracket and a maximum power point tracking device for the photovoltaic component according to any of the above embodiments, wherein the photovoltaic component can be rotatably mounted on the photovoltaic bracket, and the maximum power point tracking device for the photovoltaic component is communicatively connected to the photovoltaic component and the photovoltaic bracket respectively.

[0018] A fourth aspect of the embodiments of the present application provides a computer device, including: at least one processor; and a memory communicatively coupled to the at least one processor; Wherein: the memory stores instructions that can be executed by at least one processor, and the instructions are executed by at least one processor so that the at least one processor can execute the method of any implementation aspect of the above-mentioned embodiment.

[0019] According to a fifth aspect of the embodiments of the present application, a computer-readable storage medium is provided, in which computer instructions are stored. When the computer instructions are executed by a processor, a method as in any of the implementation aspects of the above embodiments is implemented.

[0020] The embodiment of the present application determines the maximum power point based on the current-voltage characteristic curve of the photovoltaic module. The result is not affected by the external environment, has a more accurate reference value, and is closer to the actual maximum power value of the photovoltaic module. The adjusted power generation power of the photovoltaic module is close to the actual maximum power value of the photovoltaic module, which can further improve the power generation efficiency of the photovoltaic module. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings exemplarily illustrate the embodiments and constitute a part of the specification, and together with the text description of the specification, are used to explain the exemplary implementation of the embodiments. The embodiments shown are for illustrative purposes only and do not limit the scope of the claims. In all drawings, the same reference numerals refer to similar but not necessarily identical elements.

[0021] Figure 1 A schematic flow chart of a maximum power point tracking method for a photovoltaic assembly according to an embodiment of the present application is shown.

[0022] Figure 2 Show according to Figure 1 Schematic diagram of the sub-step flow chart of step S220.

[0023] Figure 3 Show according to Figure 2 Schematic diagram of the sub-step flow chart of step S223.

[0024] Figure 4 Show according to Figure 2 Schematic diagram of the sub-step flow chart of step S223.

[0025] Figure 5 Show according to Figure 1 Schematic diagram of the sub-step flow chart of step S230.

[0026] Figure 6 Show according to Figure 5 Schematic diagram of the sub-step flow chart of step S234.

[0027] Figure 7 A schematic flow chart showing a maximum power point tracking method of a photovoltaic assembly according to another embodiment of the present application.

[0028] Figure 8 A schematic structural block diagram of a maximum power point tracking device for a photovoltaic assembly according to another embodiment of the present application is shown.

[0029] Fig. 9 The hardware architecture diagram of a computer device according to an embodiment of the present application is schematically shown. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0031] It should be noted that the descriptions involving "first", "second", etc. in the embodiments of the present application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0032] In the description of the present application, it should be understood that the numerical labels before the steps do not indicate the order in which the steps are executed, but are only used to facilitate the description of the present application and to distinguish each step, and therefore should not be understood as a limitation on the present application.

[0033] To facilitate those skilled in the art to understand the technical solutions provided in the embodiments of the present application, the relevant technologies are described below: The embodiment of the present application provides a technical solution for tracking the maximum power point of a photovoltaic module. In this technical solution, the maximum power point is determined based on the current-voltage characteristic curve of the photovoltaic module, and the result is not affected by the external environment, has a more accurate reference value, and is closer to the actual maximum power value of the photovoltaic module, so that the adjusted power generation power of the photovoltaic module is close to the actual maximum power value of the photovoltaic module, which can further improve the power generation efficiency of the photovoltaic module.

[0034] The present invention provides a maximum power point tracking method for a photovoltaic module. Figure 1 FIG. 1 is a schematic flow chart of a maximum power point tracking method for a photovoltaic module according to an embodiment of the present application. Figure 1 As shown, the maximum power point tracking method of the photovoltaic module includes: S210, constructing a coordinate system, and establishing a current-voltage characteristic curve of the photovoltaic module in the coordinate system.

[0035] When the photovoltaic modules are prepared, different photovoltaic modules have different maximum power values ​​based on the photovoltaic modules themselves, including the material quality, welding quality, manufacturing process, etc. of the photovoltaic modules. In order to make full use of the photovoltaic modules, the angle of the photovoltaic modules is adjusted so that the power generation power of the photovoltaic modules is close to the maximum power value.

[0036] The power value is equal to the current value multiplied by the voltage value. Therefore, the power value is related to the voltage value and the current value. The larger the voltage value, the greater the power; the larger the current value, the greater the power.

[0037] The current-voltage characteristic curve can be obtained by testing multiple sets of current-voltage ordered pairs of photovoltaic modules and performing fitting.

[0038] S220, determining the coordinate position of the maximum power point based on the current-voltage characteristic curve.

[0039] The coordinate position of the maximum power point can be determined based on the functional relationship or geometric relationship of the current-voltage characteristic curve. The maximum power point of a photovoltaic module is the operating point at which the photovoltaic module outputs the maximum power.

[0040] Determine the position where the maximum value of I·V (the product of I and V) is located, which is the coordinate position of the maximum power point. The coordinate position of the maximum power point can be a position indicated by a functional relationship or a geometric relationship in the current-voltage characteristic curve, rather than a coordinate value determined by a determined voltage value and current value.

[0041] S230, determining a maximum power value of the photovoltaic module based on the coordinate position.

[0042] After the coordinate position is determined, the current value or voltage value corresponding to the coordinate position is analyzed based on the current, voltage or other parameters, such as the line connecting the coordinate point and the origin, the angle formed by the line and the coordinate axis, and the relationship between the angle and the current or voltage; then the maximum power value is obtained.

[0043] In the embodiment of the present application, the maximum power point of the photovoltaic module is determined by the current-voltage characteristic curve of the photovoltaic module. The current-voltage characteristic curve of the photovoltaic module is related to the photovoltaic module itself and is less affected by external environmental factors. Therefore, determining the maximum power point of the photovoltaic module by the current-voltage characteristic curve can be free from the influence of external environmental factors.

[0044] In one embodiment, step S210 includes: obtaining multiple sets of current-voltage ordered pairs of photovoltaic components under different loads; each set of current-voltage ordered pairs includes a current value and a voltage value corresponding to the current value; based on the multiple sets of current-voltage ordered pairs, fitting a current-voltage characteristic curve.

[0045] By connecting a load to the photovoltaic module, gradually changing the resistance of the load, and measuring its voltage and current values, multiple sets of current-voltage ordered pairs can be obtained.

[0046] According to multiple groups of current-voltage ordered pairs, data fitting is performed to obtain current-voltage characteristic curves.

[0047] In one example, Lagrangian interpolation fitting is performed by the following equations (1) and (2) to obtain an IV characteristic curve.

[0048] (1) (2) Where, I(V) represents the functional relationship with V as the independent variable and I as the dependent variable, i.e., the IV characteristic curve; i, j and m all represent the sequence numbers in multiple sets of current-voltage ordered number pairs; Represents the Lagrange interpolation coefficient of the i-th (V, I) point.

[0049] In one embodiment, multiple sets of current-voltage ordered pairs of photovoltaic components under different loads are obtained, including: obtaining multiple sets of current-voltage ordered pairs of photovoltaic components under different loads at intervals of a preset duration to update the current-voltage characteristic curve.

[0050] When a photovoltaic module is used for a period of time, the maximum power of the photovoltaic module may change due to material consumption, wear, etc. Therefore, after a preset period of time, the photovoltaic module is measured again and the current-voltage characteristic curve is updated so that the maximum power value of the photovoltaic module is close to the actual maximum power value.

[0051] In an example, the preset duration may be 30-365 days, such as 30 days, 60 days, 100 days, 360 days, or one year.

[0052] When the photovoltaic module is used, it will be connected to some electrical equipment. When updating the current-voltage characteristic curve, the electrical equipment can be powered off, and then the load for testing can be loaded on the photovoltaic module to adjust different loads and obtain multiple sets of current-voltage ordered pairs.

[0053] In the embodiment of the present application, multiple groups of current-voltage ordered pairs are measured again after a preset time interval to update the current-voltage characteristic curve, so that the obtained maximum power value of the photovoltaic component is further close to the actual maximum power value.

[0054] In one embodiment, the number of the plurality of sets of current-voltage ordered pairs is 8-18 sets.

[0055] The more the number of current-voltage ordered pairs is, the more accurate the current-voltage characteristic curve obtained by fitting is. In order to obtain a reliable current-voltage characteristic curve, the number of current-voltage ordered pairs is at least greater than 8; if the number of current-voltage ordered pairs is too large, more time costs will be wasted, so it can be within the range of less than 18 groups.

[0056] In one embodiment, Figure 2 and Figure 3 As shown, step S220 includes: S221, determining the short-circuit current (Isc) and the open-circuit voltage (Voc) based on the current-voltage characteristic curve.

[0057] S222, determining a first tangent line of the short-circuit current relative to the current-voltage characteristic curve, and a second tangent line of the open-circuit voltage relative to the current-voltage characteristic curve.

[0058] S223: Determine the coordinate position of the maximum power point based on the first tangent and the second tangent.

[0059] like Figure 3 As shown, based on the current-voltage characteristic curve, when V=0, the Isc value can be determined; when I=0, the Voc value can be determined.

[0060] In one example, the tangent lines at the two points (0, Isc) and (Voc, 0) can be obtained according to the Taylor formula shown in the following equations (3) and (4), and the short-circuit current (Isc) and the open-circuit voltage (Voc) can be calculated.

[0061] (3) (4) in, is a function with V as the independent variable, f is the corresponding law; V0 represents the horizontal coordinate of a point when Taylor's formula is used at that point; represents the Lagrangian remainder of the n-th order Taylor expansion.

[0062] like Figure 3 As shown, based on the first tangent of the short-circuit current (Isc) relative to the current-voltage characteristic curve , and the second tangent of the open circuit voltage (Voc) relative to the current-voltage characteristic curve , the coordinate position M of the maximum power point can be determined. The coordinate position of the maximum power point can be determined by analyzing the tangent point positions of the first tangent line and the second tangent line and their slopes relative to the coordinate axis.

[0063] The embodiment of the present application uses the first tangent and the second tangent, and the coordinate position of the maximum power point to quickly determine the coordinate position of the maximum power point. The first tangent and the second tangent are related to the current-voltage characteristic curve and do not need to be determined based on other parameters that may change with environmental factors. Therefore, the coordinate position of the maximum power point determined by this implementation will not change due to changes in the external environment, thereby obtaining an accurate maximum power value.

[0064] In one embodiment, Figure 4 As shown, step S223 includes: S2231, construct a parallelogram based on the first tangent line, the second tangent line, and the origin of the coordinate system.

[0065] Specific construction examples are as follows Figure 3 As shown. Based on the first tangent and the second tangent, parallel lines of the first tangent and the second tangent are drawn from the origin respectively, and the first tangent and the second tangent are extended to obtain a parallelogram.

[0066] S2232, based on the diagonal line including the origin in the parallelogram, determine the intersection of the diagonal line and the current-voltage characteristic curve as the coordinate position of the maximum power point.

[0067] like Figure 3 As shown, the diagonal line F of the parallelogram intersects the current-voltage characteristic curve at point M, and point M is the coordinate position of the maximum power point.

[0068] The present application embodiment has conducted multiple experimental tests on multiple different photovoltaic modules to determine the intersection of the diagonal line and the current-voltage characteristic curve as the coordinate position of the maximum power point. The experimental data are shown in Table 1: Table 1. Comparison table of experimental data and theoretical data obtained by step S2232

[0069] Among them, in the theoretical calculation method, δ mp (°) is the angle between the diagonal and the voltage coordinate axis obtained by using the parallelogram method, V mp is the voltage value at the intersection, P mp is the power value corresponding to the intersection point.

[0070] IV tester testing, V mp is the voltage value of the photovoltaic module at the maximum power value, P mp It is the maximum power value under multiple tests.

[0071] In the embodiment of the present application, the coordinate position of the maximum power point is determined by the parallelogram rule, and then the coordinate value corresponding to the coordinate position is determined based on the coordinate position to obtain the maximum power value. This processing method is simple and specific, does not require complex model training and processing, and the obtained results are accurate and reliable.

[0072] In one embodiment, Figure 5 As shown, step S230 includes: S231, determining a first tangent angle of the first tangent line relative to the voltage coordinate axis based on the first tangent line.

[0073] S232: Determine a second tangent angle of the second tangent relative to the current coordinate axis based on the second tangent.

[0074] S233: Determine a target inclination angle of the diagonal line relative to the voltage coordinate axis or the current coordinate axis based on the first cutting angle and the second cutting angle.

[0075] S234, determining a maximum power value of the photovoltaic assembly based on the target tilt angle, the first cutting angle, the second cutting angle, the short-circuit current (Isc) and the open-circuit voltage (Voc).

[0076] like Figure 3 As shown, the voltage coordinate axis is the coordinate axis in the coordinate system that represents the voltage value; the current coordinate axis is the coordinate axis in the coordinate system that represents the current value.

[0077] Using the aforementioned Taylor formula, equations (3) and (4) can obtain the first tangent angle of the first tangent line relative to the voltage coordinate axis: , The expression is as shown in formula (5); and the second tangent angle of the second tangent relative to the current coordinate axis can be calculated , The expression of is as shown in formula (6).

[0078] (5) (6) Based on the constructed parallelogram, the target tilt angle δ of the diagonal relative to the voltage coordinate axis is determined by combining the following equations (7) and (8): mp It is expressed as shown in formula (9), (7) (8) (9) in, , , , , are the unit vectors in the horizontal and vertical directions respectively.

[0079] In one embodiment, Figure 6 As shown, step S234 includes: S2341, based on multiple sets of current-voltage ordered number pairs or current-voltage characteristic curves, obtain multiple sets of tilt angle-voltage ordered number pairs, wherein the tilt angle-voltage ordered number pairs include tilt angles and voltage values ​​corresponding to the tilt angles.

[0080] In some other examples, S2341 may also be based on multiple sets of current-voltage ordered pairs or current-voltage characteristic curves to obtain multiple sets of tilt angle-current values, wherein the tilt angle-current value includes the tilt angle and the current value corresponding to the tilt angle. In subsequent steps, the current value is used as the dependent variable to analyze and obtain the corresponding tilt angle.

[0081] S2342, based on multiple groups of tilt angle-voltage ordered number pairs, obtain a tilt angle-voltage characteristic curve.

[0082] Similar to the above method of obtaining the current-voltage characteristic curve, the Lagrange interpolation method can also be used to fit multiple groups of tilt angle-voltage ordered number pairs to obtain the tilt angle-voltage characteristic curve.

[0083] S2343, based on the target tilt angle and the tilt angle-voltage characteristic curve, determine that the voltage corresponding to the target tilt angle is the target voltage corresponding to the maximum power value .

[0084] In the tilt angle-voltage characteristic curve, each tilt angle has a corresponding voltage value, so through a known target tilt angle, a target voltage value corresponding to the target tilt angle can be obtained, that is, the target voltage value at the coordinate position of the maximum power point.

[0085] S2344, based on the current-voltage characteristic curve and the target voltage, determine the target current corresponding to the maximum power value .

[0086] S2345, obtaining the maximum power value of the photovoltaic module according to the target voltage and the target current corresponding to the maximum power value.

[0087] After the target voltage is determined, the corresponding target current is determined. Based on the target current multiplied by the target voltage, the maximum power value of the photovoltaic module can be obtained.

[0088] In one implementation, step S234 includes: Based on the current-voltage characteristic curve, determining an inclination angle-coordinate comparison table, the inclination angle-coordinate comparison table including a plurality of inclination angles and coordinates corresponding to the inclination angles; Look up the inclination angle-coordinate comparison table to determine the coordinate value corresponding to the target inclination angle.

[0089] By selecting multiple points in the current-voltage characteristic curve and determining the corresponding inclination angles and coordinates of the multiple points, a inclination angle-coordinate comparison table is constructed. When the target inclination angle corresponding to the maximum power value is determined, the coordinate value corresponding to the target inclination angle can be quickly obtained by looking up the table.

[0090] In one example, a tilt angle-power comparison table can also be determined based on the current-voltage characteristic curve, where each tilt angle has a corresponding coordinate and a corresponding power value. The power value is obtained by multiplying the voltage by the current. By looking up the tilt angle-power comparison table, the maximum power value can be quickly determined.

[0091] In one embodiment, Figure 7 As shown, the maximum power point tracking method of the photovoltaic module also includes: S240, obtaining the current power value of the photovoltaic module.

[0092] S250, comparing the maximum power value and the current power value, and when the difference between the maximum power value and the current power value exceeds a preset threshold range, adjusting the angle of the photovoltaic module to adjust the difference between the current power value and the maximum power value of the photovoltaic module to be within the preset threshold range.

[0093] By continuously testing the current power value and adjusting the angle of the photovoltaic module so that the current power value and the maximum power value meet the preset threshold range, it can be determined that the power generation efficiency of the photovoltaic module has reached a better level at this angle.

[0094] like Figure 8 As shown, the embodiment of the present application further provides a maximum power point tracking device 800 of a photovoltaic assembly, and the maximum power point tracking device 800 of the photovoltaic assembly includes: The curve construction module 801 is used to construct a coordinate system and establish a current-voltage characteristic curve of the photovoltaic module in the coordinate system; A coordinate position determination module 802, used to determine the coordinate position of the maximum power point based on the current-voltage characteristic curve; The maximum power value determination module 803 is used to determine the maximum power value of the photovoltaic module based on the coordinate position.

[0095] In one implementation, the curve construction module 801 is used to: Acquire multiple sets of current-voltage ordered pairs of photovoltaic components under different loads; each set of current-voltage ordered pairs includes a current value and a voltage value corresponding to the current value; Based on multiple sets of current-voltage ordered pairs, the current-voltage characteristic curve is obtained by fitting.

[0096] In one embodiment, multiple sets of current-voltage ordered pairs of photovoltaic components under different loads are obtained, including: obtaining multiple sets of current-voltage ordered pairs of photovoltaic components under different loads at intervals of a preset duration to update the current-voltage characteristic curve.

[0097] In one embodiment, the number of the plurality of sets of current-voltage ordered pairs is 8-18 sets.

[0098] In one implementation, the coordinate location determination module 802 is used to: Based on the current-voltage characteristic curve, determine the short-circuit current and open-circuit voltage; Determining a first tangent line of the short-circuit current with respect to the current-voltage characteristic curve, and a second tangent line of the open-circuit voltage with respect to the current-voltage characteristic curve; Based on the first tangent line and the second tangent line, the coordinate position of the maximum power point is determined.

[0099] Further, based on the first tangent and the second tangent, determining the coordinate position of the maximum power point includes: Construct a parallelogram based on the first and second tangents and the origin of the coordinate system; Based on the diagonal line including the origin in the parallelogram, the intersection point of the diagonal line and the current-voltage characteristic curve is determined as the coordinate position of the maximum power point.

[0100] In one implementation, the maximum power value determination module 803 is configured to: Determining a first tangent angle of the first tangent line relative to the voltage coordinate axis based on the first tangent line; determining a second tangent angle of the second tangent relative to the current coordinate axis based on the second tangent; Based on the first cutting angle and the second cutting angle, determining a target inclination angle of the diagonal line relative to the voltage coordinate axis or the current coordinate axis; The maximum power value of the photovoltaic assembly is determined based on the target tilt angle, the first cutting angle, the second cutting angle, the short-circuit current and the open-circuit voltage.

[0101] Further, determining the maximum power value of the photovoltaic assembly based on the target tilt angle, the first cutting angle, the second cutting angle, the short-circuit current and the open-circuit voltage includes: Based on the multiple sets of current-voltage ordered number pairs, multiple sets of tilt angle-voltage ordered number pairs are obtained, wherein the tilt angle-voltage ordered number pairs include the tilt angle and the voltage value corresponding to the tilt angle; Based on multiple groups of tilt angle-voltage ordered pairs, a tilt angle-voltage characteristic curve is obtained; Based on the target tilt angle and the tilt angle-voltage characteristic curve, determining that the voltage corresponding to the target tilt angle is the target voltage corresponding to the maximum power value; Determine the target current corresponding to the maximum power value based on the current-voltage characteristic curve and the target voltage; According to the target voltage and target current, the maximum power value of the photovoltaic module is obtained.

[0102] Further, determining the coordinate value of the maximum power point based on the target tilt angle, the first cutting angle, the second cutting angle, the short-circuit current and the open-circuit voltage includes: Based on the current-voltage characteristic curve, determining an inclination angle-coordinate comparison table, the inclination angle-coordinate comparison table including a plurality of inclination angles and coordinates corresponding to the inclination angles; Look up the inclination angle-coordinate comparison table to determine the coordinate value corresponding to the target inclination angle.

[0103] In one embodiment, the maximum power point tracking device of the photovoltaic assembly further includes: A current power value acquisition module is used to obtain the current power value of the photovoltaic module; The angle adjustment module is used to compare the maximum power value and the current power value. When the difference between the maximum power value and the current power value exceeds a preset threshold range, the angle of the photovoltaic module is adjusted to adjust the difference between the current power value and the maximum power value of the photovoltaic module to be within the preset threshold range.

[0104] The embodiment of the present application also provides a photovoltaic system, including a photovoltaic component, a photovoltaic bracket, and a maximum power point tracking device for the photovoltaic component of any of the above embodiments, wherein the photovoltaic component can be rotatably mounted on the photovoltaic bracket, and the maximum power point tracking device for the photovoltaic component is respectively connected to the photovoltaic component and the photovoltaic bracket for communication. The maximum power point tracking device for the photovoltaic component collects and obtains the current value and voltage value of the photovoltaic component, determines the current power value, compares the current power value with the maximum power value, and sends an angle adjustment signal to the photovoltaic component to adjust the angle of the photovoltaic component when the comparison result exceeds a preset threshold range.

[0105] Fig. 9 The hardware architecture diagram of a computer device 10000 suitable for implementing a maximum power point tracking method for a photovoltaic module according to an embodiment of the present application is schematically shown. In some embodiments, the computer device 10000 may be a terminal device such as a smart phone, a wearable device, a tablet computer, a personal computer, a vehicle terminal, a game console, a virtual device, a workbench, a digital assistant, a set-top box, a robot, etc. In other embodiments, the computer device 10000 may be a rack server, a blade server, a tower server, or a cabinet server (including an independent server, or a server cluster composed of multiple servers), etc. Fig. 9 As shown, the computer device 10000 includes but is not limited to: a memory 10010, a processor 10020, and a network interface 10030 that can communicate with each other through a system bus. Among them: The memory 10010 includes at least one type of computer-readable storage medium, and the readable storage medium includes flash memory, hard disk, multimedia card, card-type memory (such as SD or DX memory), random access memory (RAM), static random access memory (SRAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), programmable read-only memory (PROM), magnetic memory, magnetic disk, optical disk, etc. In some embodiments, the memory 10010 can be an internal storage module of the computer device 10000, such as a hard disk or memory of the computer device 10000. In other embodiments, the memory 10010 can also be an external storage device of the computer device 10000, such as a plug-in hard disk equipped on the computer device 10000, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), etc. Of course, the memory 10010 can also include both the internal storage module of the computer device 10000 and its external storage device. In this embodiment, the memory 10010 is generally used to store the operating system and various application software installed in the computer device 10000, such as the program code of the maximum power point tracking method of the photovoltaic module, etc. In addition, the memory 10010 can also be used to temporarily store various data that have been output or will be output.

[0106] In some embodiments, the processor 10020 may be a central processing unit (CPU), a controller, a microcontroller, a microprocessor, or other chips. The processor 10020 is generally used to control the overall operation of the computer device 10000, such as performing control and processing related to data interaction or communication with the computer device 10000. In this embodiment, the processor 10020 is used to run the program code stored in the memory 10010 or process data.

[0107] The network interface 10030 may include a wireless network interface or a wired network interface, and the network interface 10030 is generally used to establish a communication link between the computer device 10000 and other computer devices. For example, the network interface 10030 is used to connect the computer device 10000 to an external terminal through a network, and to establish a data transmission channel and a communication link between the computer device 10000 and the external terminal. The network may be a wireless or wired network such as an intranet, the Internet, the Global System of Mobile communication (GSM), Wideband Code Division Multiple Access (WCDMA), 4G network, 5G network, Bluetooth, Wi-Fi, etc.

[0108] It should be pointed out that Fig. 9 Only a computer device having components 10010 - 10030 is shown, but it should be understood that implementing all of the components shown is not a requirement, and more or fewer components may alternatively be implemented.

[0109] In this embodiment, the maximum power point tracking method of the photovoltaic assembly stored in the memory 10010 can also be divided into one or more program modules and executed by one or more processors (such as processor 10020) to complete the embodiment of the present application.

[0110] The embodiment of the present application further provides a computer-readable storage medium having a computer program stored thereon, wherein when the computer program is executed by a processor, the steps of the maximum power point tracking method of the photovoltaic assembly in the embodiment are implemented.

[0111] In this embodiment, the computer-readable storage medium includes flash memory, hard disk, multimedia card, card-type memory (for example, SD or DX memory, etc.), random access memory (RAM), static random access memory (SRAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), programmable read-only memory (PROM), magnetic memory, disk, optical disk, etc. In some embodiments, the computer-readable storage medium may be an internal storage unit of a computer device, such as a hard disk or memory of the computer device. In other embodiments, the computer-readable storage medium may also be an external storage device of a computer device, such as a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), etc. equipped on the computer device. Of course, the computer-readable storage medium may also include both an internal storage unit of a computer device and an external storage device thereof. In this embodiment, the computer-readable storage medium is generally used to store an operating system and various application software installed on a computer device, such as the program code of the maximum power point tracking method of a photovoltaic module in the embodiment, etc. In addition, the computer-readable storage medium may also be used to temporarily store various types of data that have been output or are to be output.

[0112] An embodiment of the present application also provides a computer program product, including a computer program, which implements the method in the above embodiment when executed by a processor.

[0113] Obviously, those skilled in the art should understand that the modules or steps of the above-mentioned embodiments of the present application can be implemented by general-purpose computer devices, they can be concentrated on a single computer device, or distributed on a network composed of multiple computer devices, optionally, they can be implemented by executable program codes of computer devices, so that they can be stored in a storage device and executed by the computer device, and in some cases, the steps shown or described can be executed in a different order from that herein, or they can be made into individual integrated circuit modules, or multiple modules or steps therein can be made into a single integrated circuit module for implementation. In this way, the embodiments of the present application are not limited to any specific combination of hardware and software.

[0114] It should be noted that the above are only preferred embodiments of the present application, and the patent protection scope of the present application is not limited thereto. Any equivalent structure or equivalent process transformation made using the contents of the specification and drawings of the present application, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A maximum power point tracking method for a photovoltaic module, characterized in that: The method comprises: Constructing a coordinate system, and establishing a current-voltage characteristic curve of the photovoltaic module in the coordinate system; Based on the current-voltage characteristic curve, determining the coordinate position of the maximum power point; Based on the coordinate position, a maximum power value of the photovoltaic component is determined.

2. The maximum power point tracking method of a photovoltaic module according to claim 1, characterized in that: The step of constructing a coordinate system and establishing a current-voltage characteristic curve of a photovoltaic module in the coordinate system includes: Acquire multiple groups of current-voltage ordered pairs of the photovoltaic module under different loads; each group of the current-voltage ordered pairs includes a current value and a voltage value corresponding to the current value; The current-voltage characteristic curve is obtained by fitting based on the multiple groups of current-voltage ordered pairs.

3. The maximum power point tracking method of a photovoltaic module according to claim 2, characterized in that: The obtaining of multiple sets of current-voltage ordered pairs of the photovoltaic component under different loads includes: obtaining multiple sets of current-voltage ordered pairs of the photovoltaic component under different loads at intervals of a preset time length to update the current-voltage characteristic curve.

4. The maximum power point tracking method of a photovoltaic module according to claim 2, characterized in that: The number of the multiple sets of current-voltage ordered pairs is 8-18 sets.

5. The maximum power point tracking method of a photovoltaic module according to any one of claims 1 to 4, characterized in that: The step of determining the coordinate position of the maximum power point based on the current-voltage characteristic curve comprises: Based on the current-voltage characteristic curve, determining the short-circuit current and the open-circuit voltage; Determining a first tangent line of the short-circuit current relative to the current-voltage characteristic curve, and a second tangent line of the open-circuit voltage relative to the current-voltage characteristic curve; Based on the first tangent line and the second tangent line, a coordinate position of the maximum power point is determined.

6. The maximum power point tracking method of a photovoltaic module according to claim 5, characterized in that: The step of determining the coordinate position of the maximum power point based on the first tangent line and the second tangent line includes: Constructing a parallelogram based on the first tangent line, the second tangent line, and the origin of the coordinate system; A diagonal line including the origin in the parallelogram is obtained, and an intersection point between the diagonal line and the current-voltage characteristic curve is determined as the coordinate position of the maximum power point.

7. The maximum power point tracking method of a photovoltaic assembly according to claim 6, characterized in that: The determining the maximum power value of the photovoltaic component based on the coordinate position includes: determining a first tangent angle of the first tangent line relative to a voltage coordinate axis based on the first tangent line; determining a second tangent angle of the second tangent line relative to the current coordinate axis based on the second tangent line; Based on the first cutting angle and the second cutting angle, determining a target inclination angle of the diagonal line relative to the voltage coordinate axis or the current coordinate axis; The maximum power value of the photovoltaic assembly is determined based on the target tilt angle, the first cutting angle, the second cutting angle, the short-circuit current, and the open-circuit voltage.

8. The maximum power point tracking method of a photovoltaic assembly according to claim 7, characterized in that: The determining the maximum power value of the photovoltaic assembly based on the target tilt angle, the first cutting angle, the second cutting angle, the short-circuit current and the open-circuit voltage includes: Based on the multiple sets of current-voltage ordered number pairs, multiple sets of tilt angle-voltage ordered number pairs are obtained, wherein the tilt angle-voltage ordered number pairs include tilt angles and voltage values ​​corresponding to the tilt angles; Based on multiple groups of tilt angle-voltage ordered pairs, a tilt angle-voltage characteristic curve is obtained; Based on the target tilt angle and the tilt angle-voltage characteristic curve, determining that the voltage corresponding to the target tilt angle is the target voltage corresponding to the maximum power value; Determining a target current corresponding to the maximum power value based on the current-voltage characteristic curve and the target voltage; A maximum power value of the photovoltaic component is obtained according to the target voltage and the target current.

9. A maximum power point tracking device for a photovoltaic module, characterized in that: include: A curve construction module, used to construct a coordinate system and establish a current-voltage characteristic curve of the photovoltaic module in the coordinate system; A coordinate position determination module, used to determine the coordinate position of the maximum power point based on the current-voltage characteristic curve; The maximum power value determination module is used to determine the maximum power value of the photovoltaic component based on the coordinate position.

10. A photovoltaic system, characterized in that: It comprises a photovoltaic component, a photovoltaic bracket and the maximum power point tracking device of the photovoltaic component as claimed in claim 9, wherein the photovoltaic component can be rotatably mounted on the photovoltaic bracket, and the maximum power point tracking device of the photovoltaic component is communicatively connected with the photovoltaic component and the photovoltaic bracket respectively.

11. A computer device, characterized in that: include: at least one processor; as well as a memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the method according to any one of claims 1 to 8.

12. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and when the computer instructions are executed by a processor, the method according to any one of claims 1 to 8 is implemented.

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