A method, system and device for adjusting the ground reflective material of a photovoltaic module

Abstract

The present invention discloses a method, a system and a device for adjusting the ground reflective material of a photovoltaic module. The method includes: obtaining light-related parameters and module-related parameters, wherein the light-related parameters include the solar altitude angle, and the module-related parameters include the module installation inclination angle, the module array spacing and the module length; calculating the size of the bright area according to the light-related parameters and the module-related parameters; obtaining the size of the reflective material, and determining whether the size of the reflective material is greater than or equal to the size of the bright area; if so, adjusting the reflective material to a position covering the bright area; if not, adjusting the reflective material to a position with the maximum irradiation amount within the bright area. The present invention determines the bright area based on parameters such as the solar altitude angle and the module installation inclination angle, and performs dynamic control on the reflective material, ensuring that the reflective material is as much as possible within the bright area, making the most of the direct sunlight, and thus effectively improving the backside power generation gain of the photovoltaic module.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic power generation, and particularly relates to a method, a system and a device for adjusting the ground reflective material of a photovoltaic module. Background Art

[0002] At present, land resources are scarce, and the construction of large-scale photovoltaic power stations faces the problem of how to obtain higher power generation on limited land. Compared with the previous single-sided modules, double-sided modules with higher power generation and lower cost per kilowatt-hour are becoming more and more popular and gradually becoming the mainstream. For double-sided modules, how to make good use of the power generation gain on the back is an important technology for double-sided module power stations.

[0003] Currently, in terms of improving the power generation gain on the back of double-sided modules, the existing technologies mainly include methods such as raising the pile foundation height, appropriately changing the module angle, and appropriately increasing the pile foundation spacing during the construction process. However, when the height or the pile foundation spacing increases to a certain extent, the improvement of the back gain basically reaches saturation. Among them, too large a pile foundation spacing will reduce the land utilization rate and cause an increase in costs, which is not worth the loss. The change of the module angle is basically within the vicinity of the optimal angle of the module, and the improvement of the back gain is limited. There are also technologies that begin to consider the reflection problem after sunlight enters the ground, and try to increase the reflected irradiance received on the back of the photovoltaic module by increasing the ground reflective material, thereby increasing the back gain of the photovoltaic module, but lack relevant control and adjustment strategies for the reflective material. Summary of the Invention

[0004] The problem solved by the present invention is that the existing method of increasing the power generation gain by adding ground reflective material lacks relevant control strategies for the reflective material.

[0005] The present invention provides a method for adjusting the ground reflective material of a photovoltaic module, including:

[0006] Obtaining light-related parameters and module-related parameters, wherein the light-related parameters include the solar altitude angle, and the module-related parameters include the module installation inclination angle, the module array spacing, and the module length;

[0007] Generating the size of the bright area according to the light-related parameters and the module-related parameters;

[0008] Obtaining the size of the reflective material, and determining whether the size of the reflective material is greater than or equal to the size of the bright area;

[0009] If so, adjusting the reflective material to a position covering the bright area;

[0010] If not, adjusting the reflective material to the position with the maximum irradiance within the bright area.

[0011] Optionally, the component-related parameters further include the height of the component's pile foundation. After obtaining the light-related parameters and the component-related parameters, the following steps are further included:

[0012] Based on the light-related parameters and the component-related parameters, determine whether there is a bright area;

[0013] If so, perform the step of generating the size of the bright area according to the light-related parameters and the component-related parameters;

[0014] If not, return to execute the step of obtaining the light-related parameters and the component-related parameters.

[0015] Optionally, the determination of whether there is a bright area based on the light-related parameters and the component-related parameters includes:

[0016] Generate the lowest threshold of the elevation angle and the minimum angle threshold for placing the reflective material in the bright area according to the component-related parameters;

[0017] Determine whether there exists a solar elevation angle greater than or equal to the lowest threshold of the elevation angle and the solar elevation angle greater than or equal to the minimum angle threshold;

[0018] If so, determine that there is a bright area;

[0019] If not, determine that there is no bright area.

[0020] Optionally, the method for adjusting the ground reflective material of the photovoltaic module further includes adjusting the reflective material according to a preset adjustment period. Each adjustment period includes an initial adjustment point and a final adjustment point, and the time corresponding to the initial adjustment point in each adjustment period is earlier than the time corresponding to the final adjustment point; the adjustment of the reflective material according to the preset adjustment period includes:

[0021] At the initial adjustment point of the adjustment period, obtain the light-related parameters and the component-related parameters corresponding to the time of the final adjustment point of the adjustment period;

[0022] Generate the size of the bright area according to the light-related parameters and the component-related parameters;

[0023] Obtain the size of the reflective material and determine whether the size of the reflective material is greater than or equal to the size of the bright area;

[0024] If so, adjust the reflective material to a position covering the bright area, and wait for the next adjustment period after adjustment;

[0025] If not, adjust the reflective material to the bright area, place the reflective material in the bright area, and at the final adjustment point of the adjustment cycle, adjust the reflective material to the position with the maximum irradiation amount in the bright area. After the adjustment, wait for the next adjustment cycle.

[0026] Optionally, adjusting the reflective material to the bright area and placing the reflective material in the bright area includes:

[0027] Adjust the reflective material to the middle position of the bright area.

[0028] Optionally, the middle position of the bright area is obtained by calculating based on the position of the pile foundation on the sun - side of the bright area and the distance from it to the middle position of the bright area;

[0029] When the photovoltaic module is a fixed bracket or a fixed - adjustable bracket, calculate the distance from the position of the pile foundation on the sun - side of the bright area to the middle position of the bright area according to the second preset formula. The second preset formula is as follows:

[0030]

[0031]

[0032] When the photovoltaic module is a tracking bracket, calculate the distance from the position of the pile foundation on the sun - side of the bright area to the middle position of the bright area according to the third preset formula. The third preset formula is as follows:

[0033]

[0034]

[0035] Wherein, l represents the distance from the position of the pile foundation on the sun - side of the bright area to the middle position of the bright area, d represents the distance between the module arrays, L represents the length of the module, θ is the installation inclination angle of the module, h represents the height of the module pile foundation, β1 represents the altitude angle of the sunlight, and γ represents the azimuth angle of the sun.

[0036] Optionally, the method for adjusting the ground reflective material of the photovoltaic module includes:

[0037] When the photovoltaic module is a tracking bracket, the adjustment cycle length of the reflective material is less than or equal to the tracking cycle length of the tracking bracket.

[0038] Optionally, generating the size of the bright area according to the light - related parameters and the module - related parameters includes:

[0039] Substitute the component installation inclination angle, the component array spacing, the component length, and the solar altitude angle into the first preset formula to generate the width of the bright area;

[0040] Among them, the first preset formula is as follows:

[0041]

[0042] Among them, D represents the width of the bright area, d represents the component array spacing, L represents the component length, θ represents the component installation inclination angle, and β1 represents the solar altitude angle.

[0043] The present invention also provides a photovoltaic module ground reflective material adjustment system, including: an information collection and interaction module, a bright area calculation module, and a reflective material control module;

[0044] The information collection and interaction module is used to obtain light-related parameters and component-related parameters. Among them, the light-related parameters include the solar altitude angle, and the component-related parameters include the component installation inclination angle, the component array spacing, and the component length;

[0045] The bright area calculation module is used to generate the size of the bright area according to the light-related parameters and the component-related parameters; obtain the size of the reflective material, and judge whether the size of the reflective material is greater than or equal to the size of the bright area;

[0046] The reflective material control module is used to adjust the reflective material to the position covering the bright area when the size of the reflective material is greater than or equal to the size of the bright area; and adjust the reflective material to the position with the maximum irradiation amount in the bright area when the size of the reflective material is less than the size of the bright area.

[0047] The present invention also provides a photovoltaic module ground reflective material adjustment device, including a computer-readable storage medium storing a computer program and a processor. When the computer program is read and run by the processor, the above-mentioned photovoltaic module ground reflective material adjustment method is realized.

[0048] By obtaining the light-related parameters and the component-related parameters, calculating the size of the bright area according to the light-related parameters and the component-related parameters, then judging the size relationship between the reflective material and the bright area, determining the adjustment strategy of the reflective material, and dynamically controlling the reflective material, the present invention ensures that the reflective material is as much as possible located in the bright area, makes the best use of direct light, and efficiently utilizes light resources. Thus, the changes in parameters such as the component installation inclination angle and the component array spacing can complement the adjustment strategy of the reflective material, and finally achieve the effect of improving the gain on the back side of the bifacial module. Compared with the method of simply directly laying a reflective film, the method of the present invention can more significantly improve the power generation by dynamically controlling the reflective material and efficiently utilizing light resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 FIG. 1 is a schematic flow chart of a method for adjusting the ground reflective material of a photovoltaic module according to an embodiment of the present invention;

[0050] Figure 2 FIG. 2 is a schematic diagram of a fixed bracket and a limit angle in a method for adjusting the ground reflective material of a photovoltaic module according to an embodiment of the present invention;

[0051] Figure 3 FIG. 3 is a schematic diagram of key nodes of an adjustment period in a method for adjusting the ground reflective material of a photovoltaic module according to an embodiment of the present invention;

[0052] Figure 4 FIG. 4 is a schematic diagram of a fixed adjustable bracket and a limit angle in a method for adjusting the ground reflective material of a photovoltaic module according to an embodiment of the present invention;

[0053] Figure 5 FIG. 5 is a schematic diagram of an example in a method for adjusting the ground reflective material of a photovoltaic module according to an embodiment of the present invention;

[0054] Figure 6 FIG. 6 is a schematic diagram of an adjustment system for the ground reflective material of a photovoltaic module according to an embodiment of the present invention;

[0055] Figure 7 FIG. 7 is a schematic diagram of a bright area in an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0056] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the following detailed description of the specific embodiments of the present invention will be given with reference to the accompanying drawings.

[0057] For example Figure 1 , in an embodiment of the present invention, the method for adjusting the ground reflective material of the photovoltaic module includes:

[0058] Step S1, obtaining light-related parameters and component-related parameters, where the light-related parameters include the solar altitude angle, and the component-related parameters include the component installation inclination angle, the component array spacing, and the component length.

[0059] Among them, the solar altitude angle can be collected in advance according to the typical annual solar altitude angle trajectory in the area where the photovoltaic module is located to obtain the solar altitude angle at different time points; it can also be obtained in real time for the area where the photovoltaic module is located. The module installation inclination angle, the module array spacing, and the module length can all be manually input and stored, or can be detected by devices such as sensors. For example, for a fixed bracket, since the module-related parameters such as the module installation inclination angle, the module array spacing, and the module length are relatively fixed, they can be manually input. For a fixed adjustable bracket, since the module installation inclination angle is adjustable, it can be manually input or relevant sensors can be used to detect the module installation inclination angle in real time. When the detected module installation inclination angle changes, the changed module installation inclination angle is input and stored.

[0060] The pre-obtained light-related parameters and module-related parameters can be stored in a preset database for ready call when executing relevant calculation programs.

[0061] Step S2, generate the size of the bright area according to the light-related parameters and the module-related parameters.

[0062] Such as Figure 7 , in the present invention, each row of photovoltaic arrays corresponds to a bright area, and the bright area is a rectangular bright area formed by the direct sunlight on the ground on one side of the photovoltaic array. The length direction of the bright area is parallel to the length direction of the photovoltaic array, and the width direction of the bright area is parallel to the width direction of the photovoltaic array.

[0063] In one embodiment, the size of the bright area in the present invention refers to the length of the bright area. Since the length direction of the bright area is parallel to the length direction of the photovoltaic array, the length of the bright area will not change due to different solar altitude angles or photovoltaic module-related parameters. The length of the bright area can be limited to be equal to the length of the corresponding photovoltaic array. At this time, since the length of the photovoltaic array is relatively fixed, the length of the bright area is also relatively fixed. It can be stored in advance and called when needed, or can be calculated based on the module length and the number of modules in a row of photovoltaic arrays.

[0064] In one embodiment, the size of the bright area in the present invention refers to the width of the bright area. The width of the bright area changes with different solar altitude angles or photovoltaic module-related parameters, and the width of the bright area is calculated by light-related parameters such as the solar altitude angle and module-related parameters such as the module installation inclination angle and the module array spacing.

[0065] In another embodiment, the size of the bright area in the present invention refers to the length and width of the bright area. The length of the bright area can be defined as equal to the length of the corresponding photovoltaic array. At this time, since the length of the photovoltaic array is relatively fixed, the length of the bright area is also relatively fixed. The length of the bright area can be stored in advance and retrieved when needed, or it can be calculated based on the component length and the number of components in a row of the photovoltaic array. The width of the bright area is calculated from lighting-related parameters such as the solar altitude angle and component-related parameters such as the component installation inclination angle and the component array spacing.

[0066] Optionally, the size of the bright area includes the width of the bright area, and step S2 includes: substituting the component installation inclination angle, the component array spacing, the component length, and the solar altitude angle into a first preset formula to generate the width of the bright area; wherein, the first preset formula is as follows:

[0067]

[0068] Wherein, D represents the width of the bright area, d represents the component array spacing, L represents the component length, θ represents the component installation inclination angle, and β1 represents the solar altitude angle.

[0069] By substituting the component installation inclination angle, the component array spacing, the component length, and the solar altitude angle into the first preset formula to calculate the width of the bright area, when the component installation inclination angle, the component array spacing, the component length, or the solar altitude angle changes, the changed width of the bright area can be calculated accordingly, thereby ensuring the accuracy of the width of the bright area and ensuring the accuracy of the adjustment of the reflective material.

[0070] Step S3, obtain the size of the reflective material, and determine whether the size of the reflective material is greater than or equal to the size of the bright area.

[0071] The reflective materials in this article can be materials with reflective functions, such as reflective films, reflective mirrors, aluminum foil papers, etc. The reflective materials in this article are arranged in the bright areas of each row of photovoltaic arrays, and the reflective materials corresponding to each row of photovoltaic arrays are independent adjustment objects. The reflective materials can be set as rectangular materials with a certain length and width. When laying the reflective materials, their initial position and orientation are set as follows: the length direction of the reflective materials is parallel to the length direction of the photovoltaic arrays, and the width direction of the reflective materials is parallel to the width direction of the photovoltaic arrays. When the bright area size in the present invention refers to the length of the bright area, the reflective material size refers to the length of the reflective material. When the bright area size in the present invention refers to the width of the bright area, the reflective material size refers to the width of the reflective material. When the bright area size in the present invention refers to the length and width of the bright area, the reflective material size refers to the length and width of the reflective material. The reflective material size here refers to the size of the reflective material that is an independent adjustment object in the bright area of the photovoltaic module. For example, assuming that five rows of photovoltaic arrays are correspondingly provided with five reflective materials, the reflective material size here refers to the size of a single reflective material.

[0072] After calculating the bright area size of a row of photovoltaic arrays, compare the bright area size of this row of photovoltaic arrays with the size of the reflective material arranged in the bright area of this row of photovoltaic arrays to determine subsequent adjustment operations.

[0073] In different embodiments, the judgment of whether the reflective material size is greater than or equal to the bright area size in step S3 has different meanings, which are specifically as follows:

[0074] When the bright area size in the present invention refers to the length of the bright area and the reflective material size refers to the length of the reflective material, comparing the bright area size with the reflective material size specifically includes: comparing the length of the bright area with the length of the reflective material.

[0075] When the bright area size in the present invention refers to the width of the bright area and the reflective material size refers to the width of the reflective material, comparing the bright area size with the reflective material size specifically includes: comparing the width of the bright area with the width of the reflective material.

[0076] When the bright area size in the present invention refers to the length and width of the bright area and the reflective material size refers to the length and width of the reflective material, comparing the bright area size with the reflective material size specifically includes: comparing the length of the bright area with the length of the reflective material and comparing the width of the bright area with the width of the reflective material.

[0077] Step S4, if so, adjust the reflective material to a position covering the bright area.

[0078] In different embodiments, the adjustment of the reflective material to a position covering the bright area in step S4 has different meanings, which are specifically as follows:

[0079] When the size of the light area in the present invention refers to the length of the light area and the size of the reflective material refers to the length of the reflective material, if the size of the reflective material is greater than or equal to the size of the light area, adjust the position of the reflective material in the length direction of the reflective material, and in the length direction of the reflective material and the light area, make the reflective material cover the light area.

[0080] When the size of the light area in the present invention refers to the width of the light area and the size of the reflective material refers to the width of the reflective material, if the size of the reflective material is greater than or equal to the size of the light area, adjust the position of the reflective material in the width direction of the reflective material, and in the width direction of the reflective material and the light area, make the reflective material cover the light area.

[0081] When the size of the light area in the present invention refers to the length and width of the light area and the size of the reflective material refers to the length and width of the reflective material, respectively obtain the size relationship between the light area and the reflective material in terms of length and the size relationship between the light area and the reflective material in terms of width. If the length of the reflective material is greater than or equal to the length of the light area and the width of the reflective material is greater than or equal to the width of the light area, then respectively in the length direction and width direction of the reflective material and the light area, control the reflective material to cover the light area.

[0082] If the size of the reflective material is greater than or equal to the size of the light area, control the reflective material to fill the light area, that is, control the position of the reflective material to cover the light area, and a larger irradiation amount can be obtained. Thus, by adjusting the position of the reflective material to cover the light area when the size of the reflective material is greater than or equal to the size of the light area, a larger irradiation amount can be obtained while simplifying the control logic, thereby effectively improving the backside gain of the photovoltaic module.

[0083] Furthermore, the middle position of the light area can be determined, and the middle position of the reflective material is placed at the middle position of the light area to achieve covering the light area with the reflective material. When the size of the light area in the present invention refers to the length of the light area and the size of the reflective material refers to the length of the reflective material, the middle positions of both the reflective material and the light area refer to the middle position in the length direction. When the size of the light area in the present invention refers to the width of the light area and the size of the reflective material refers to the width of the reflective material, the middle positions of both the reflective material and the light area refer to the middle position in the width direction. When the size of the light area in the present invention refers to the length and width of the light area and the size of the reflective material refers to the length and width of the reflective material, the middle positions of both the reflective material and the light area refer to the middle positions in the length direction and width direction.

[0084] The size of the reflective material is a known parameter. After obtaining the size of the reflective material, the middle position in the length direction, the middle position in the width direction, and the middle positions in the length direction and width direction of the reflective material can be calculated.

[0085] The length of the bright area is predefined, so the length of the bright area can be directly obtained, and then the middle position in the length direction of the bright area can be calculated.

[0086] The width of the bright area needs to be calculated based on light-related parameters and component-related parameters. Optionally, the middle position of the bright area is calculated from the position of the pile foundation on the near-sun side of the bright area and the distance from the pile foundation position to the middle position of the bright area. The pile foundation position on the near-sun side of the bright area refers to the pile foundation adjacent to the bright area and close to the sun side. Denote the pile foundation position on the near-sun side of the bright area as point A, and denote the distance from the pile foundation position on the near-sun side of the bright area to the middle position of the bright area as l. The pile foundation position A on the near-sun side of the bright area can be pre-recorded. After calculating l, the position within the bright area that is at a length of l from the pile foundation position A on the near-sun side of the bright area can be determined as the middle position of the bright area.

[0087] Optionally, when the photovoltaic module is a fixed bracket or a fixed adjustable bracket, calculate the distance from the pile foundation position on the near-sun side of the bright area to the middle position of the bright area according to the second preset formula. The second preset formula is as follows:

[0088]

[0089]

[0090] When the photovoltaic module is a tracking bracket, since the tracking bracket tracks the solar azimuth angle and altitude angle in real time, and the front side of the module faces the sun side both in the morning and afternoon, the value of b should also change accordingly in the morning and afternoon. Therefore, calculate the distance from the pile foundation position on the near-sun side of the bright area to the middle position of the bright area according to the third preset formula. The third preset formula is as follows:

[0091]

[0092]

[0093] Wherein, l represents the distance from the pile foundation position on the near-sun side of the bright area to the middle position of the bright area, d represents the component array spacing, L represents the component length, θ is the component installation inclination angle, h represents the component pile foundation height, β1 represents the solar altitude angle, and γ represents the solar azimuth angle.

[0094] Step S5, if not, then adjust the reflective material to the position with the maximum irradiation amount within the bright area.

[0095] In different embodiments, adjusting the reflective material to the position with the maximum irradiation amount in step S5 has different meanings, specifically as follows:

[0096] When the size of the bright area in the present invention refers to the length of the bright area and the size of the reflective material refers to the length of the reflective material, if the size of the reflective material is smaller than the size of the bright area, adjust the reflective material to the position with the maximum irradiation amount within the bright area.

[0097] When the size of the bright area in the present invention refers to the width of the bright area and the size of the reflective material refers to the width of the reflective material, if the size of the reflective material is smaller than the size of the bright area, adjust the reflective material to the position with the maximum irradiation amount within the bright area.

[0098] When the size of the bright area in the present invention refers to the length and width of the bright area and the size of the reflective material refers to the length and width of the reflective material, respectively obtain the size relationship between the length of the bright area and the reflective material and the size relationship between the width of the bright area and the reflective material. If the length of the reflective material is smaller than the length of the bright area and the width of the reflective material is smaller than the width of the bright area, adjust the reflective material to the position with the maximum irradiation amount within the bright area. If the length of the reflective material is smaller than the length of the bright area, but the width of the reflective material is greater than or equal to the width of the bright area, then in the width direction of the reflective material and the bright area, make the reflective material cover the bright area, and in the length direction of the reflective material and the bright area, adjust the reflective material to the position with the maximum irradiation amount within the bright area. If the width of the reflective material is smaller than the width of the bright area, but the length of the reflective material is greater than or equal to the length of the bright area, then in the length direction of the reflective material and the bright area, make the reflective material cover the bright area, and in the width direction of the reflective material and the bright area, adjust the reflective material to the position with the maximum irradiation amount within the bright area.

[0099] By obtaining the light-related parameters and component-related parameters, calculating the size of the bright area according to the light-related parameters and component-related parameters, then judging the size relationship between the reflective material and the bright area, determining the adjustment strategy of the reflective material, and implementing dynamic control of the reflective material, ensure that the reflective material is as much as possible within the bright area, make the most of the direct light, and efficiently utilize the light resources, so that the changes in parameters such as the installation inclination angle of the component and the spacing of the component array can complement the adjustment strategy of the reflective material, and finally achieve the effect of enhancing the back gain of the bifacial component. Compared with the method of simply directly laying the reflective film, the method described in the present invention can efficiently utilize the light resources through dynamic control of the reflective material, and the increase in power generation is more obvious.

[0100] Optionally, the component-related parameters further include the height of the component pile foundation. After obtaining the light-related parameters and component-related parameters, it further includes:

[0101] Judge whether there is a bright area according to the light-related parameters and the component-related parameters;

[0102] If there is a bright area, execute the step S2 and the subsequent steps;

[0103] If there is no bright area, return to execute step S1 and subsequent steps, that is, re-obtain the light-related parameters and component-related parameters, and determine whether there is a bright area according to the re-obtained light-related parameters and component-related parameters.

[0104] That is, when it is determined that there is a bright area, the reflective material is adjusted according to the position of the bright area as described in step S2 and subsequent steps, and when there is no bright area, the adjustment described in step S2 and subsequent steps is not performed. Optionally, when there is no bright area, the reflective material can be kept in place without adjusting its position, or the reflective material can be placed at a specific position, for example, placed in the middle of two adjacent rows of arrays.

[0105] By judging whether there is a bright area after obtaining the light-related parameters and component-related parameters, calculating the size of the bright area only when there is a bright area, and performing subsequent adjustment operations of the reflective material according to the size of the bright area. When there is no bright area, re-obtain the light-related parameters and component-related parameters, then judge whether there is a bright area, and do not perform the adjustment operation of the reflective material, so as to reduce the amount of invalid calculations and reduce energy consumption.

[0106] Optionally, judging whether there is a bright area according to the light-related parameters and the component-related parameters includes:

[0107] Generate a minimum altitude angle threshold and a minimum angle threshold for placing the reflective material in the bright area according to the component-related parameters; judge whether there exists a solar altitude angle greater than or equal to the minimum altitude angle threshold and the solar altitude angle greater than or equal to the minimum angle threshold; if so, determine that there is a bright area; if not, determine that there is no bright area.

[0108] As Figure 2 , two extreme angles of the bright area are shown: the minimum altitude angle threshold α and the minimum angle threshold β2 for placing the reflective material in the bright area. The minimum altitude angle threshold α, when the solar altitude angle is less than this value, there is no bright area and there is no need to adjust the reflective material. The minimum angle threshold β2 for placing the reflective material in the bright area limits the placement position of the reflective material. When the minimum altitude angle threshold α is less than the minimum angle threshold β2, the position of the reflective material is adjusted according to the minimum angle threshold β2. In different latitudes and longitudes, due to the differences in array spacing and inclination, the sizes of α and β2 may be different. In areas where α < β2, the placement position of the reflective material is adjusted according to the minimum angle of β2, that is, when the solar altitude angle is less than β2, there is no bright area, and when the solar altitude angle is greater than β2, there is a bright area; in areas where β2 < α, the placement position of the reflective material is adjusted according to the minimum angle of α, that is, when the solar altitude angle is less than α, there is no bright area, and when the solar altitude angle is greater than α, there is a bright area.

[0109] Among them, the calculation method of the minimum altitude angle threshold α is as follows:

[0110]

[0111] The calculation method of the minimum angle threshold β2 for placing the reflective material in the bright area is as follows:

[0112]

[0113] Wherein, d is the component array spacing, that is, the spacing between two adjacent rows of arrays; L is the component length; θ is the component installation inclination angle; h is the height of the component pile foundation on the ground.

[0114] β1 refers to the solar altitude angle obtained from the light-related parameters. When α, β2, and β1 satisfy the following magnitude relationship, it is determined that there is a bright area; otherwise, there is no bright area:

[0115] α < β2 ∨ β1 or β2 < α ∨ β1,

[0116] By comparing the solar altitude angle with the lowest threshold of the altitude angle and the minimum angle threshold for placing the reflective material in the bright area, the judgment of whether there is a bright area is realized, so as to clarify when the reflective material needs to be adjusted and when it does not need to be adjusted. While timely adjusting the reflective material to the bright area, ineffective adjustment operations are avoided.

[0117] Optionally, the method for adjusting the ground reflective material of the photovoltaic module further includes adjusting the reflective material according to a preset adjustment period. Each adjustment period includes an initial adjustment point and a final adjustment point, and the time corresponding to the initial adjustment point in each adjustment period is earlier than the time corresponding to the final adjustment point. The adjusting the reflective material according to a preset adjustment period includes:

[0118] At the initial adjustment point of the adjustment period, obtain the light-related parameters and component-related parameters corresponding to the time of the final adjustment point of the adjustment period;

[0119] Generate the size of the bright area according to the light-related parameters and the component-related parameters;

[0120] Obtain the size of the reflective material, and judge whether the size of the reflective material is greater than or equal to the size of the bright area;

[0121] If so, adjust the reflective material to the position covering the bright area, and wait for the next adjustment period after adjustment. The above steps are cycled in the next adjustment period until the end of the day;

[0122] If not, adjust the reflective material to the bright area, place the reflective material in the bright area, and at the end adjustment point of the adjustment cycle, adjust the reflective material to the position with the maximum irradiation amount in the bright area. After the adjustment, wait for the next adjustment cycle, and repeat the above steps in the next adjustment cycle until the end of the day.

[0123] Among them, by presetting the adjustment cycle, the reflective material is adjusted according to the adjustment cycle. Each adjustment cycle of the reflective material is divided into two stages: preliminary adjustment and final adjustment. At the preliminary adjustment point, steps S1 to S4 and the first half of step S5 are executed, that is, the light-related parameters and component-related parameters are obtained. Among them, the light-related parameters and component-related parameters corresponding to the end adjustment point of the adjustment cycle are obtained, and the size of the bright area is calculated according to the light-related parameters and component-related parameters; the size of the reflective material is obtained, and it is judged whether the size of the reflective material is greater than or equal to the size of the bright area; if so, the reflective material is adjusted to the position covering the bright area, and after the adjustment, wait for the next adjustment cycle; if not, the reflective material is adjusted to the bright area to place the reflective material in the bright area. Subsequently, when the time reaches the end adjustment point, fine-tune continuously in the bright area, and at the same time calculate the irradiation amount on the front and / or back of the component when the reflective material is in different positions through the light intensity sensor, and select the position of the reflective material corresponding to the maximum irradiation amount as the final position.

[0124] Such as Figure 3 , the 1 / 4 moment of the adjustment cycle T1 can be set as the preliminary adjustment point, and the 1 / 2 moment of the adjustment cycle T1 can be set as the end adjustment point. When the time reaches 1 / 4T1, if the size of the reflective material is greater than or equal to the size of the bright area, the reflective material is adjusted to the position of the bright area corresponding to 1 / 2T1 and no final adjustment is required; if the size of the reflective material is smaller than the size of the bright area, the reflective material is adjusted to the bright area corresponding to 1 / 2T1 as the preliminary adjustment. When the time reaches 1 / 2T1, continuously fine-tune the position of the reflective material, and calculate in real time the irradiation amount received by the front and / or back of the photovoltaic module through the light intensity sensor, and select the position of the reflective material corresponding to the maximum irradiation amount as the final adjustment position, and maintain this final adjustment position until the 1 / 4T1 of the next adjustment cycle is reached and then adjust.

[0125] Optionally, different adjustment cycle durations are set according to different latitudes. The higher the latitude, the shorter the adjustment cycle duration, and the lower the latitude, the longer the adjustment cycle duration.

[0126] Optionally, different adjustment cycle durations are set according to the altitude angle. The lower the altitude angle, the shorter the adjustment cycle duration, and the higher the altitude angle, the longer the adjustment cycle duration. For example, the altitude angle at noon is higher than that in the afternoon, so the adjustment cycle duration at noon can be set longer than that in the afternoon.

[0127] Optionally, for fixed brackets and fixed adjustable brackets, the duration of the adjustment period can be freely set; for tracking brackets, the duration of the adjustment period should be less than or equal to the tracking period duration of the tracking bracket.

[0128] By presetting the adjustment period, at the initial adjustment point of the adjustment period, the size of the bright area corresponding to the end adjustment point is calculated using the light-related parameters and component-related parameters corresponding to the end adjustment point, to achieve the prediction of the short-term future bright area. Based on the prediction of the short-term future bright area, the position of the reflective material is adjusted. When the size of the reflective material is smaller than the size of the bright area, first adjust the reflective material to the predicted position of the bright area. When the time reaches the time corresponding to the end adjustment point, the actual irradiation amount can be measured by, for example, a light intensity sensor, so as to determine the position with the maximum irradiation amount.

[0129] Optionally, adjusting the reflective material into the bright area and placing the reflective material in the bright area includes: adjusting the reflective material to the middle position of the bright area.

[0130] At the initial adjustment point, when the size of the reflective material is smaller than the size of the bright area, adjust the reflective material to the middle position of the bright area. Adjusting the reflective material to the middle position of the bright area can specifically adjust the middle position of the reflective material to the middle position of the bright area. In different embodiments of the size of the bright area and the size of the reflective material, the middle position of the bright area has different meanings, and the specific content has been detailed above and will not be elaborated here. Because the solar altitude angle and azimuth angle are also changing in real time during the period from the initial adjustment point to the end adjustment point, and placing the reflective material in the middle position of the bright area, even if the position of the bright area changes due to the change of the solar altitude angle and azimuth angle, it can still ensure that the reflective material is located in the bright area as much as possible, so as to make full use of the direct light as much as possible.

[0131] Optionally, the middle position of the bright area is calculated through the position of the pile foundation on the near-sun side of the bright area and the distance from it to the middle position of the bright area. Denote the position of the pile foundation on the near-sun side of the bright area as point A, and denote the distance from the position of the pile foundation on the near-sun side of the bright area to the middle position of the bright area as l. The position of the pile foundation on the near-sun side of the bright area, point A, can be recorded in advance, and at the same time, calculate the length l from the position of the pile foundation on the near-sun side of the bright area to the middle position of the bright area. During actual adjustment, adjust the center position of the reflective material to the position at a length of l from the position of the pile foundation on the near-sun side of the bright area, point A.

[0132] Regarding the distance l from the position of the pile foundation on the near-sun side of the bright area to the middle position of the bright area, when the photovoltaic module is a fixed bracket or a fixed adjustable bracket, calculate the distance l from the position of the pile foundation on the near-sun side of the bright area to the middle position of the bright area according to the second preset formula. The second preset formula is as follows:

[0133]

[0134]

[0135] When the photovoltaic module is a tracking bracket, since the tracking bracket tracks the solar azimuth angle and altitude angle in real time, and the front side of the module faces the sun both in the morning and afternoon, the value of b should also be changed accordingly in the morning and afternoon. Therefore, the distance l from the pile foundation position on the sun side of the bright area to the middle position of the bright area is calculated according to the third preset formula, and the third preset formula is as follows:

[0136]

[0137]

[0138] Wherein, d represents the module array spacing, L represents the module length, θ is the module installation inclination angle, h represents the module pile foundation height, β1 represents the solar altitude angle, and γ represents the solar azimuth angle.

[0139] Calculating the distance from the pile foundation position on the sun side of the bright area to the middle position of the bright area through the above formula is convenient for subsequently determining the middle position of the bright area, clarifying the position of the bright area, so as to facilitate the position adjustment of the reflective material.

[0140] Optionally, the method for adjusting the ground reflective material of the photovoltaic module includes:

[0141] When the photovoltaic module is a fixed adjustable bracket, such as Figure 4 , its module installation inclination angle changes with seasons or months. Therefore, after the module installation inclination angle is updated, the above calculation of the method for adjusting the ground reflective material of the photovoltaic module of the present invention is performed using the updated module installation inclination angle.

[0142] When the photovoltaic module is a tracking bracket, since the tracking bracket tracks the solar azimuth angle and altitude angle in real time, the installation inclination angle of its components may change accordingly. Therefore, after the installation inclination angle of its components is updated, the above calculations of the method for adjusting the ground reflective material of the photovoltaic module of the present invention are performed using the updated installation inclination angle of the components. The tracking bracket has a certain tracking period, and the tracking angle changes periodically in real time. Moreover, because it is a double-sided module, the installation inclination angle of the tracking bracket components is not necessarily perpendicular to the solar altitude angle. Therefore, it is necessary to measure the installation inclination angle of the tracking bracket components within each tracking period, and use the latest obtained installation inclination angle for the above calculations to ensure the accuracy of the calculation results. Optionally, to ensure that the installation inclination angle used for the method for adjusting the ground reflective material of the photovoltaic module of the present invention is the latest inclination angle, the adjustment period length of the reflective material is set to be less than or equal to the tracking period length of the tracking bracket. Optionally, the adjustment period of the reflective material is consistent with the tracking period of the tracking bracket, that is, the period lengths of the two are the same, and the start node and end node of the period are the same.

[0143] Thus, by obtaining in advance the light-related parameters such as the solar altitude angle and azimuth angle, if it is a fixed bracket, reasonably control the position of the reflective material; if it is a fixed adjustable bracket, reasonably control the change of the position of the lower surface reflective material and the installation inclination angle of the components; if it is a tracking bracket, reasonably control the change of the position of the reflective material, the installation inclination angle and the tracking period, so as to adapt to power stations of various bracket types, with a wide application range and effectively improving the power generation gain on the back side of the photovoltaic module.

[0144] To facilitate the understanding of the present invention, an example is given as follows Figure 5 In this example, it is preset that the length of the reflective material is equal to the length of the bright area, and the reflective material always covers the bright area in the length direction.

[0145] Step 1: Obtain in advance the solar altitude angle, azimuth angle trajectory information; obtain in advance the information such as the installation inclination angle of the components, the component array spacing, the component length, and the component pile foundation height.

[0146] Step 2: Divide the adjustment period and formulate the adjustment time of the initial adjustment point and the final adjustment point of the reflective material.

[0147] Step 3: Determine whether there is a bright area. If there is a bright area, execute Step 4 and subsequent adjustments; if there is no bright area, do not execute subsequent adjustments and wait for the next cycle.

[0148] Step 4: Start the initial adjustment.

[0149] Step 5: Calculate the limit angle of the placement position of the reflective material.

[0150] Step 6: Calculate the width of the bright area.

[0151] Step 7: Calculate the length from the middle position of the bright area to the pile foundation of the adjacent bright area and close to the sun side.

[0152] Step 8: Compare the width of the bright area with the width of the reflective material. If the width of the bright area is less than or equal to the width of the reflective material, control the reflective material to fill the bright area, and no final adjustment is required; if the width of the bright area is greater than the width of the reflective material, control the reflective material to be located at the middle position of the bright area.

[0153] Step 9: Final adjustment. When the time reaches the adjustment time of the final adjustment node, continuously fine-tune within the bright area, and at the same time calculate the sum of the irradiance on the front and back sides of the component through the light intensity sensor, and select the position corresponding to the maximum irradiance as the final position of the reflective material.

[0154] Step 10: In the next cycle, repeat the above steps until the end of the day.

[0155] In an embodiment of the present invention, as Figure 6 , the photovoltaic module ground reflective material adjustment system includes: an information collection and interaction module, a bright area calculation module, and a reflective material control module;

[0156] The information collection and interaction module is used to obtain light-related parameters and component-related parameters. Among them, the light-related parameters include the solar altitude angle, and the component-related parameters include the component installation inclination angle, the component array spacing, and the component length;

[0157] The bright area calculation module is used to generate the size of the bright area according to the light-related parameters and the component-related parameters; obtain the size of the reflective material, and judge whether the size of the reflective material is greater than or equal to the size of the bright area;

[0158] The reflective material control module is used to adjust the reflective material to the position covering the bright area when the size of the reflective material is greater than or equal to the size of the bright area; and adjust the reflective material to the position with the maximum irradiance within the bright area when the size of the reflective material is less than the size of the bright area.

[0159] Among them, the information collection and interaction module can also interact with humans to manually input the required information. The bright area calculation module is mainly responsible for calculation, substituting the received solar altitude angle, azimuth angle, etc. and the photovoltaic array information at that time into the algorithm formula, and forming the result to be transmitted to the reflective material control module. The reflective material control module is responsible for forming a control instruction based on the received result and controlling the action of the reflective material.

[0160] The above photovoltaic module ground reflective material adjustment system omits the central control module, uses the information collection and interaction module as the instruction initiation end, and the reflective material control module as the instruction execution end, simplifies the system module, and improves the robustness of the entire system.

[0161] Optionally, the component-related parameters further include the height of the component pile foundation. After the light area calculation module obtains the light-related parameters and the component-related parameters through the information collection and interaction module, it further performs: judging whether there is a light area according to the light-related parameters and the component-related parameters; if so, performing the step of generating the size of the light area according to the light-related parameters and the component-related parameters; if not, returning to the information collection and interaction module to re-obtain the light-related parameters and the component-related parameters.

[0162] Optionally, the light area calculation module is further configured to generate a minimum altitude angle threshold and a minimum angle threshold for placing the reflective material in the light area according to the component-related parameters; judge whether there exists a solar altitude angle greater than or equal to the minimum altitude angle threshold and the solar altitude angle greater than or equal to the minimum angle threshold; if so, determining that there is a light area; if not, determining that there is no light area.

[0163] Optionally, the method for adjusting the ground reflective material of the photovoltaic module further includes adjusting the reflective material according to a preset adjustment period. Each adjustment period includes a start adjustment point and an end adjustment point, and the time corresponding to the start adjustment point in each adjustment period is earlier than the time corresponding to the end adjustment point. At the start adjustment point of the adjustment period, the information collection and interaction module obtains the light-related parameters and the component-related parameters corresponding to the end adjustment point of the adjustment period, and the light area calculation module generates the size of the light area according to the light-related parameters and the component-related parameters, generates the size of the light area according to the light-related parameters and the component-related parameters, obtains the size of the reflective material, judges whether the size of the reflective material is greater than or equal to the size of the light area, and sends the judgment result of whether the size of the reflective material is greater than or equal to the size of the light area to the reflective material control module. If the size of the reflective material is greater than or equal to the size of the light area, the reflective material control module adjusts the reflective material to a position covering the light area, and waits for the next adjustment period after the adjustment. If the size of the reflective material is less than the size of the light area, the reflective material control module adjusts the reflective material into the light area, places the reflective material in the light area, and at the end adjustment point of the adjustment period, the reflective material control module adjusts the reflective material to the position with the maximum irradiation amount in the light area, and waits for the next adjustment period after the adjustment.

[0164] Optionally, the reflective material control module is specifically configured to adjust the reflective material to the middle position of the light area if the size of the reflective material is less than the size of the light area.

[0165] Optionally, the middle position of the light area is calculated through the position of the pile foundation on the near-sun side of the light area and the distance from the pile foundation to the middle position of the light area;

[0166] When the photovoltaic module is a fixed bracket or a fixed adjustable bracket, calculate the distance from the pile foundation position on the near-sun side of the bright area to the middle position of the bright area according to the second preset formula. The second preset formula is as follows:

[0167]

[0168]

[0169] When the photovoltaic module is a tracking bracket, calculate the distance from the pile foundation position on the near-sun side of the bright area to the middle position of the bright area according to the third preset formula. The third preset formula is as follows:

[0170]

[0171]

[0172] Wherein, l represents the distance from the pile foundation position on the near-sun side of the bright area to the middle position of the bright area, d represents the module array spacing, L represents the module length, θ is the module installation inclination angle, h represents the module pile foundation height, β1 represents the solar altitude angle, and γ represents the solar azimuth angle.

[0173] Optionally, when the photovoltaic module is a tracking bracket, the adjustment period length of the reflective material is less than or equal to the tracking period length of the tracking bracket.

[0174] Optionally, the bright area calculation module is further configured to substitute the module installation inclination angle, the module array spacing, the module length, and the solar altitude angle into the first preset formula to generate the width of the bright area;

[0175] Wherein, the first preset formula is as follows:

[0176]

[0177] Wherein, D represents the width of the bright area, d represents the module array spacing, L represents the module length, θ represents the module installation inclination angle, and β1 represents the solar altitude angle.

[0178] In an embodiment of the present invention, a photovoltaic module ground reflective material adjustment device includes a computer-readable storage medium storing a computer program and a processor. When the computer program is read and run by the processor, the above-mentioned photovoltaic module ground reflective material adjustment method is implemented. The beneficial effects of the photovoltaic module ground reflective material adjustment device of the present invention compared with the prior art are the same as those of the above-mentioned photovoltaic module ground reflective material adjustment method, and will not be elaborated here.

[0179] The reader should understand that in the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0180] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A method for adjusting the ground reflective material of a photovoltaic module, characterized in that, It includes the following steps: Obtain light-related parameters and component-related parameters; among them, at the initial adjustment point of the adjustment period, obtain the light-related parameters and the component-related parameters corresponding to the time of the final adjustment point of the adjustment period; each adjustment period includes an initial adjustment point and a final adjustment point, and the time corresponding to the initial adjustment point within each adjustment period is earlier than the time corresponding to the final adjustment point; the light-related parameters include the solar altitude angle, and the component-related parameters include the component installation inclination angle, the component array spacing, and the component length; Generate the size of the bright area according to the light-related parameters and the component-related parameters; Obtain the size of the reflective material, and judge whether the size of the reflective material is greater than or equal to the size of the bright area; If so, adjust the reflective material to the position covering the bright area, and wait for the next adjustment period after the adjustment; If not, adjust the reflective material into the bright area, place the reflective material in the bright area, and at the final adjustment point of the adjustment period, adjust the reflective material to the position with the largest irradiation amount in the bright area, and wait for the next adjustment period after the adjustment; Among them, the component-related parameters further include the component pile foundation height. After obtaining the light-related parameters and the component-related parameters, the photovoltaic module ground reflective material adjustment method further includes: Judge whether there is a bright area according to the light-related parameters and the component-related parameters; If so, execute the step of generating the size of the bright area according to the light-related parameters and the component-related parameters; If not, return to execute the step of obtaining the light-related parameters and the component-related parameters.

2. The method for adjusting the ground reflective material of a photovoltaic module according to claim 1, wherein, The judging whether there is a bright area according to the light-related parameters and the component-related parameters includes: Generate the lowest altitude angle threshold and the minimum angle threshold for placing the reflective material in the bright area according to the component-related parameters; Judge whether there exists the solar altitude angle greater than or equal to the lowest altitude angle threshold and the solar altitude angle greater than or equal to the minimum angle threshold; If so, determine that there is a bright area; If not, determine that there is no bright area.

3. The method for adjusting the ground reflective material of a photovoltaic module according to claim 1, characterized in that, The adjusting the reflective material into the bright area and placing the reflective material in the bright area includes: Adjust the reflective material to the middle position of the bright area.

4. The method for adjusting the ground reflective material of a photovoltaic module according to claim 3, wherein, The middle position of the bright area is obtained by calculating the position of the pile foundation on the near-sun side of the bright area and the distance from it to the middle position of the bright area; When the photovoltaic module is a fixed bracket or a fixed adjustable bracket, calculate the distance from the position of the pile foundation on the near-sun side of the bright area to the middle position of the bright area according to the second preset formula, and the second preset formula is as follows: ， ， When the photovoltaic module is a tracking bracket, calculate the distance from the position of the pile foundation on the near-sun side of the bright area to the middle position of the bright area according to the third preset formula, and the third preset formula is as follows: ， ， Among them, represents the distance from the position of the pile foundation on the near-sun side of the bright area to the middle position of the bright area, represents the component array pitch, represents the component length, is the component installation inclination angle, represents the height of the component pile foundation, represents the solar altitude angle, and γ represents the solar azimuth angle.

5. The method for adjusting the ground reflective material of a photovoltaic module according to claim 1, characterized in that, It includes: When the photovoltaic module is a tracking bracket, the adjustment period length of the reflective material is less than or equal to the tracking period length of the tracking bracket.

6. The method for adjusting the ground reflective material of the photovoltaic module according to claim 1, characterized in that, The generating the size of the bright area according to the light-related parameters and the component-related parameters includes: Substitute the component installation inclination angle, the component array spacing, the component length, and the solar altitude angle into the first preset formula to generate the width of the bright area; Among them, the first preset formula is as follows: ， Among them, represents the width of the bright area, represents the component array pitch, L represents the component length, represents the installation inclination angle of the component, represents the solar altitude angle.

7. A photovoltaic module ground reflective material adjustment system, characterized in that, It includes: An information collection and interaction module, a bright area calculation module, and a reflective material control module; The information collection and interaction module is used to obtain light-related parameters and component-related parameters; among them, at the initial adjustment point of the adjustment period, obtain the light-related parameters and the component-related parameters corresponding to the end adjustment point time of the adjustment period; each adjustment period includes an initial adjustment point and an end adjustment point, and the time corresponding to the initial adjustment point in each adjustment period is earlier than the time corresponding to the end adjustment point; the light-related parameters include the solar altitude angle, and the component-related parameters include the component installation inclination angle, the component array spacing, and the component length; The bright area calculation module is used to generate the bright area size according to the light-related parameters and the component-related parameters; obtain the reflective material size, and judge whether the reflective material size is greater than or equal to the bright area size; The reflective material control module is used to, when the reflective material size is greater than or equal to the bright area size, adjust the reflective material to the position covering the bright area, and wait for the next adjustment period after adjustment; when the reflective material size is less than the bright area size, adjust the reflective material into the bright area, place the reflective material in the bright area, and at the end adjustment point of the adjustment period, adjust the reflective material to the position with the largest irradiation amount in the bright area, and wait for the next adjustment period after adjustment; Among them, the component-related parameters further include the component pile foundation height, and the bright area calculation module is further used to, after the information collection and interaction module obtains the light-related parameters and the component-related parameters, execute: Judge whether there is a bright area according to the light-related parameters and the component-related parameters; If so, execute the step of generating the bright area size according to the light-related parameters and the component-related parameters; If not, return to execute the step of obtaining the light-related parameters and the component-related parameters.

8. A photovoltaic module ground reflective material adjusting device, characterized in that, It includes a computer-readable storage medium storing a computer program and a processor. When the computer program is read and run by the processor, it implements the photovoltaic module ground reflective material adjustment method according to any one of claims 1-6.

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