A method and device for increasing power generation of a photovoltaic tracking system

Abstract

The present invention belongs to the field of photovoltaic technology, and provides a method for improving the power generation of a photovoltaic tracking system, including: collecting the current value of one or more photovoltaic strings of the photovoltaic tracking system; combining the change state of the irradiation data in the corresponding time period, comparing the change state of the current value of the photovoltaic string for analysis, and judging the shadow shading of the photovoltaic tracking system; if the photovoltaic tracking system is shadowed, adjusting the tracking angle of the photovoltaic tracking system to eliminate the shadow shading of the photovoltaic tracking system. The present invention is used in areas with undulating terrain, when shadow shading occurs inside the photovoltaic tracking system array, to judge whether shading occurs inside the photovoltaic array through real-time irradiation and real-time photovoltaic string current change value, and timely adjust the angle of the photovoltaic tracking system according to the shadow shading situation, to avoid shadow shading between photovoltaic tracking system arrays, optimize the inverse tracking algorithm of the photovoltaic tracking system, and improve the power generation of the photovoltaic tracking system.

Description

Technical Field

[0001] The present invention relates to the field of photovoltaic technology, and in particular to a method and device for increasing the power generation of a photovoltaic tracking system. Background Art

[0002] Traditional photovoltaic tracking systems follow the trajectory of the sun. In the morning and evening, the solar altitude angle decreases, which causes shadows between rows of the photovoltaic tracking system array. In a flat terrain environment, reverse tracking technology (rotating in the opposite direction of the sun's movement) can be used to avoid shadows within the photovoltaic tracking system array. For environments with undulating terrain and slopes, the photovoltaic tracking system control system will calculate the terrain data, the relative height difference of the photovoltaic tracking system and other parameters to calculate the shadows to avoid shadows within the photovoltaic tracking system array. However, this method lacks real-time feedback on the shadow status of the components.

[0003] If you want to obtain the shadow shielding situation of the photovoltaic tracking system array, the industry usually combines the photovoltaic string operation data of the inverter to determine whether shadow shielding (string power drop or string current drop) occurs. However, since the inverter is usually a certain distance away from the photovoltaic tracking system controller, it is necessary to obtain the real-time operation data of the strings from the inverter system end through wired or wireless methods. In actual operation, there are still the following problems: the wired method requires a lot of cables; each string input end of the inverter needs to be matched with the photovoltaic strings on each photovoltaic tracking system, and a lot of manual matching confirmation work is required in actual operation; in the wired method, since the inverter system and the photovoltaic tracking system control system are two types of products from two manufacturers, there is a certain time delay in the data transmission between the two, and it is difficult to obtain the real shielding status in a timely and accurate manner; in the wireless method, since the inverter system and the photovoltaic tracking system control system are two types of products from two manufacturers, there is a long time delay in the data transmission between the two, and it is impossible to obtain the real shielding status in a timely and accurate manner. Summary of the invention

[0004] In view of this problem, the present invention provides a method and device for increasing the power generation of a photovoltaic tracking system.

[0005] In order to achieve the above purpose of the present invention, the present invention is realized by the following technologies:

[0006] In one aspect, the present invention provides a method for increasing power generation of a photovoltaic tracking system, comprising:

[0007] Collecting current values ​​of one or more photovoltaic strings of a photovoltaic tracking system;

[0008] Combined with the change state of the irradiation data in the corresponding time period, the change state of the current value of the photovoltaic string is compared and analyzed to determine the shadow shielding condition of the photovoltaic tracking system;

[0009] If it is determined that the photovoltaic tracking system is shadowed, the tracking angle of the photovoltaic tracking system is adjusted to eliminate the shadow of the photovoltaic tracking system.

[0010] In some embodiments, collecting the current value of one or more photovoltaic strings of the photovoltaic tracking system includes:

[0011] A current sensor is provided, and the photovoltaic string cables of the photovoltaic tracking system are passed through the current sensor. The current sensor collects the photovoltaic string current value on the photovoltaic tracking system in real time.

[0012] In some embodiments, it also includes:

[0013] The photovoltaic assembly current values ​​obtained by more than one current sensor are compared, and the photovoltaic string current value with a larger current change is used as a basis for judging the shadow shielding condition of the photovoltaic tracking system.

[0014] In some embodiments, the combining of the irradiation data change state in the corresponding time period and the comparison of the change state of the current value of the photovoltaic string for analysis to determine the shadow shielding condition of the photovoltaic tracking system includes:

[0015] Continuously collecting the photovoltaic string current value as the first photovoltaic string current value, and continuously collecting the irradiation data of the corresponding time period as the first irradiation data;

[0016] Calculating a first current change value and a first irradiance change value based on the first photovoltaic string current value and the first irradiance data;

[0017] If the absolute value of the first current change value and the absolute value of the first irradiance change value maintain a linear relationship, it is determined that no shadowing occurs in the photovoltaic tracking system;

[0018] If the absolute value of the first current change value exceeds a preset range of the absolute value of the first irradiance change value, it is determined that shadowing occurs in the photovoltaic tracking system;

[0019] If it is determined that the photovoltaic tracking system is shadowed, the photovoltaic tracking system is adjusted to rotate in the opposite direction of the sun's movement to increase the tracking angle of the photovoltaic tracking system.

[0020] In some embodiments, if the photovoltaic tracking system is shaded, the tracking angle of the photovoltaic tracking system is adjusted, and after rotating in the opposite direction of the sun's movement, the method further includes:

[0021] Continue to collect the photovoltaic string current value as the second photovoltaic string current value, and continue to collect the irradiation data of the corresponding time period as the second irradiation data;

[0022] Based on the second photovoltaic string current value and the second irradiance value, respectively calculating a second current change value and a second irradiance change value;

[0023] If the absolute value of the second current change value and the absolute value of the second irradiance change value maintain a linear relationship, it is determined that the photovoltaic tracking system has eliminated the shadow shading; otherwise, the photovoltaic tracking system is adjusted to continue rotating in the opposite direction of the sun's movement to eliminate the shadow shading of the photovoltaic tracking system.

[0024] A device for increasing power generation of a photovoltaic tracking system, comprising:

[0025] A collection module, used to collect current values ​​of one or more photovoltaic strings of a photovoltaic tracking system;

[0026] A judgment module, used to analyze the change state of the current value of the photovoltaic string in combination with the change state of the irradiation data in the corresponding time period, and judge the shadow shielding condition of the photovoltaic tracking system;

[0027] The adjustment module is used to adjust the tracking angle of the photovoltaic tracking system if it is determined that the photovoltaic tracking system is shadowed, so as to eliminate the shadow of the photovoltaic tracking system.

[0028] In some embodiments, the acquisition module is used to:

[0029] The photovoltaic string current value on the photovoltaic tracking system is collected in real time.

[0030] In some embodiments, the system further comprises: a comparison module for:

[0031] The photovoltaic assembly current values ​​obtained by more than one current sensor are compared, and the photovoltaic string current value with a larger current change is used as a basis for judging the shadow shielding condition of the photovoltaic tracking system.

[0032] The method and device for increasing the power generation of a photovoltaic tracking system provided by the present invention have at least the following beneficial effects:

[0033] 1. The present invention solves the problem that it is difficult to timely obtain shadow shading when shadow shading occurs inside the photovoltaic tracking system array in areas with undulating terrain. By flexibly setting current sensors, real-time irradiation and real-time photovoltaic string current change values ​​are timely obtained to determine whether shading occurs inside the photovoltaic array, and the angle of the photovoltaic tracking system is adjusted in time according to the shading situation to avoid shadow shading between photovoltaic tracking arrays.

[0034] 2. The solution of the present invention further optimizes and supplements the reverse tracking algorithm of the photovoltaic tracking system, effectively improving the power generation of the photovoltaic tracking system.

[0035] 3. For photovoltaic tracking systems in different terrain undulations and different lengths, the present invention adopts a flexible way of setting multiple current sensors to solve the array shadow problem of the photovoltaic tracking system with low cost and high flexibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The following will explain the preferred implementation mode in a clear and understandable manner with reference to the accompanying drawings, and further explain the above-mentioned characteristics, technical features, advantages and implementation methods of a method and device for increasing power generation of a photovoltaic tracking system.

[0037] Figure 1 It is a schematic diagram of an embodiment of a method for increasing power generation of a photovoltaic tracking system in the present invention;

[0038] Figure 2 It is a schematic diagram of an embodiment of a method for increasing power generation of a photovoltaic tracking system in the present invention;

[0039] Figure 3 It is a schematic diagram of an embodiment of a method for increasing power generation of a photovoltaic tracking system in the present invention;

[0040] Figure 4 It is a schematic diagram of the openable and closable Hall current sensor in the present invention. DETAILED DESCRIPTION

[0041] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0042] It should be understood that when used in this specification and the appended claims, the term "comprising" indicates the presence of the described features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or collections.

[0043] In order to simplify the drawings, only the parts related to the present invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn or marked. In this article, "one" not only means "only one", but also means "more than one".

[0044] It should be further understood that the term “and / or” used in the specification and appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0045] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0046] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0047] In one embodiment, Figure 1 As shown, the present invention provides an embodiment of a method for increasing power generation of a photovoltaic tracking system, comprising:

[0048] S101 collects current values ​​of one or more photovoltaic strings of a photovoltaic tracking system.

[0049] In this embodiment, the DC cables of the photovoltaic strings near the controller of the photovoltaic tracking system are passed through the current sensor to collect the current values ​​of the photovoltaic strings on the photovoltaic tracking system in real time.

[0050] S102 combines the change state of the irradiation data in the corresponding time period with the change state of the current value of the photovoltaic string to analyze and determine the shadow shielding condition of the photovoltaic tracking system.

[0051] In this embodiment, the preset time period includes morning and evening time periods. In the morning and evening time periods, the authenticity of the shadow shielding of the photovoltaic tracking system is judged by analyzing the sudden drop of the photovoltaic string current value and combining the change of the irradiation data.

[0052] If it is determined in S103 that the photovoltaic tracking system is shadowed, the tracking angle of the photovoltaic tracking system is adjusted to eliminate the shadow of the photovoltaic tracking system.

[0053] In this embodiment, based on the shadow blocking condition of the photovoltaic tracking system, whether the power generation of the photovoltaic tracking system is affected is monitored in real time, and a response strategy is made in time to reduce power generation losses and increase power generation income.

[0054] The present embodiment provides a real-time photovoltaic string current collection solution for a photovoltaic tracking system, which is used to determine whether shadowing occurs inside the photovoltaic array through real-time irradiation and real-time photovoltaic string current change values ​​when shadowing occurs inside the photovoltaic array in areas with undulating terrain, and timely adjust the tracking angle of the photovoltaic tracking system according to the shadowing situation, optimize the inverse tracking algorithm of the photovoltaic tracking system, avoid shadowing between photovoltaic tracking system arrays, and improve the power generation of the photovoltaic tracking system.

[0055] In one embodiment, it further includes:

[0056] According to the project terrain information of the photovoltaic tracking system, a terrain area with a slope is preferentially selected to collect the string current value of the photovoltaic tracking system.

[0057] In one embodiment, collecting the current value of one or more photovoltaic strings of the photovoltaic tracking system includes:

[0058] A current sensor is provided, and the photovoltaic string cables of the photovoltaic tracking system are passed through the current sensor. The current sensor collects the photovoltaic string current value on the photovoltaic tracking system in real time.

[0059] In one embodiment, it further includes:

[0060] The photovoltaic assembly current values ​​obtained by more than one current sensor are compared, and the photovoltaic string current value with a larger current change is used as a basis for judging the shadow shielding condition of the photovoltaic tracking system.

[0061] In this embodiment, the maximum photovoltaic string current value between the photovoltaic string current value at the middle position of the photovoltaic tracking system and the photovoltaic string current value at the end position of the photovoltaic tracking system is used as the photovoltaic string current value for judging the shading condition of the photovoltaic tracking system.

[0062] In one embodiment, the combining of the irradiation data change state in the corresponding time period and the comparison of the change state of the current value of the photovoltaic string for analysis to determine the shadow shielding condition of the photovoltaic tracking system includes:

[0063] Continuously collecting the photovoltaic string current value as the first photovoltaic string current value, and continuously collecting the irradiation data of the corresponding time period as the first irradiation data;

[0064] Calculating a first current change value and a first irradiance change value based on the first photovoltaic string current value and the first irradiance data;

[0065] If the absolute value of the first current change value and the absolute value of the first irradiance change value maintain a linear relationship, it is determined that no shadowing occurs in the photovoltaic tracking system;

[0066] If the absolute value of the first current change value exceeds a preset range of the absolute value of the first irradiance change value, it is determined that shadowing occurs in the photovoltaic tracking system.

[0067] Specifically, the photovoltaic string currents I1, I2, ..., In, In+1 are continuously collected, and the irradiation data R1, R2, ..., Rn, Rn+1 are continuously collected;

[0068] Calculate the current change value: I1 = (I2-I1) / I2, the irradiation change value: R1 = (R2-R1) / R2, and obtain I1, I2...In, and R1, R2...Rn;

[0069] If the absolute value of Ii (i = 1, 2, ... n) and the absolute value of Ri have a linear trend, no occlusion occurs;

[0070] If the absolute value of In exceeds a preset range of the absolute value of Rn, it is determined that shading occurs, and the preset range is usually between 10% and 30%.

[0071] In one embodiment, if the photovoltaic tracking system is shaded, the tracking angle of the photovoltaic tracking system is adjusted to rotate in the opposite direction of the sun's movement, and further includes:

[0072] Continue to collect the photovoltaic string current value as the second photovoltaic string current value, and continue to collect the irradiation data of the corresponding time period as the second irradiation data;

[0073] Based on the second photovoltaic string current value and the second irradiance value, respectively calculating a second current change value and a second irradiance change value;

[0074] If the absolute value of the second current change value and the absolute value of the second irradiance change value maintain a linear relationship, it is determined that the photovoltaic tracking system has eliminated the shadow shading; otherwise, the photovoltaic tracking system is adjusted to continue rotating in the opposite direction of the sun's movement to eliminate the shadow shading of the photovoltaic tracking system.

[0075] Specifically, the photovoltaic string currents In+2, In+3...Im, Im+1, and the irradiation data Rn+2, Rn+3...Rm, Rm+1 are collected, and In+1, In+2...Im, Im+1 are calculated, and Rn+1, Rn+2...Rm, Rm+1 are calculated;

[0076] If the absolute value of Ij (j=n+1, n+2...m) maintains a linear relationship with the absolute value of Rj, it is determined that the shadow is eliminated. Otherwise, the angle of the photovoltaic tracking system is adjusted to rotate in the opposite direction of the sun's movement to eliminate the shadow of the photovoltaic tracking system.

[0077] In one embodiment, the present invention provides a method for increasing power generation of a photovoltaic tracking system, which specifically comprises the steps of:

[0078] This embodiment uses a current sensor device to collect the photovoltaic string current in real time through the photovoltaic string DC cable near the photovoltaic tracking system controller. The specific steps of this solution are as follows:

[0079] Step 1: According to the project terrain information, select a terrain area with a slope to implement this plan. For example, if the terrain slope is greater than 2°, this plan has a higher implementation value.

[0080] Step 2: Use a current sensor to pass the PV string DC cable near the PV tracking system controller through the current sensor (such as an open-close Hall current sensor) to collect the PV string current value on the PV tracking system in real time.

[0081] The current sensor usually only has one PV string DC cable passing through it (or two). Usually, a single string of cables passes through it, and the sensor obtains current data with higher accuracy. The PV strings of the PV tracking system are usually 2-5 strings.

[0082] For a longer photovoltaic tracking system, there are multiple photovoltaic strings. In order to monitor the tracking angles at different positions of the photovoltaic tracking system to eliminate the influence of shadows, you can also select the strings corresponding to the middle position of the photovoltaic tracking system and the strings corresponding to the end position of the photovoltaic tracking system, set current sensors separately, compare the current values ​​obtained by the two current sensors to determine the shadow influence, and use the current sensor data that is more affected by the current value as the basis for adjusting the angle of the photovoltaic tracking system.

[0083] Step 3: The photovoltaic tracking system control system collects irradiance in real time; the current sensor is connected to the controller for communication (wired or wireless connection is acceptable), and the current data obtained by the current sensor is transmitted to the controller.

[0084] Step 4: In the morning and evening time periods (for example, before 9 a.m. and after 3 p.m. local time), analyze the sudden drop in the photovoltaic string current and combine it with the irradiation data change Rt to assist in judging the authenticity of the shading. Within time t (t may be 1 minute or 2 minutes), continuously collect the string current I1, I2...In, In+1, and continuously collect the irradiation R1, R2...Rn, Rn+1. Calculate the current change value I1=(I2-I1) / I2 and the irradiation change value R1=(R2-R1) / R2 by the formula, obtain I1, I2...In, and R1, R2...Rn. If there is no shading, the absolute value of Ii (i=1, 2...n) and the absolute value trend of Ri are linear. If the absolute value of In suddenly exceeds the absolute value of Rn, it is determined that shading has occurred.

[0085] Step 5: If obstruction occurs, adjust the tracking system to rotate in the opposite direction of the sun's movement to expand the tracking angle to eliminate shadow obstruction of the photovoltaic tracking system.

[0086] Step 6: Continue to collect string currents In+2, In+3...Im, Im+1, irradiate Rn+2, Rn+3...Rm, Rm+1, and calculate In+1, In+2...Im, Im+1, calculate Rn+1, Rn+2...Rm, Rm+1. If the absolute value of Ij (j=n+1, n+2...m) and the absolute value of Rj maintain a linear relationship, it is determined that the shadow is eliminated. Otherwise, adjust the angle of the photovoltaic tracking system to rotate in the opposite direction of the sun's movement to eliminate the shadow of the photovoltaic tracking system.

[0087] In this embodiment, if Figure 2 As shown, the present invention provides a method for increasing the power generation of a photovoltaic tracking system, which is applied to the time period after sunrise in the morning, and specifically includes:

[0088] Step 1.1: In the normal tracking mode, the photovoltaic string current (I1, I2...In, In+1) is collected in real time after sunrise, and the irradiation data (R1, R2...Rn, Rn+1) is collected continuously.

[0089] Step 1.2, calculate ΔI1, ΔI2, ..., ΔIn, ΔIn+1, and calculate ΔR1, ΔR2, ..., ΔRn, ΔRn+1.

[0090] Step 1.3: Determine whether ΔIn suddenly and significantly exceeds ΔRn; if so, proceed to step 1.4; if not, proceed to step 1.2.

[0091] Step 1.4: When ΔIn suddenly and significantly exceeds ΔRn, the angle of the photovoltaic tracking system rotates in the opposite direction.

[0092] Step 1.5, collect the string current (In+2...Im, Im+1) in real time, and continuously collect the irradiation data (Rn+2...Rm, Rm+1).

[0093] Step 1.6, calculate ΔIn+1…ΔIm, calculate ΔRn+1…ΔRm.

[0094] Step 1.7, determine whether ΔIm and ΔRm are similar; if so, proceed to step 1.8; if not, proceed to step 1.4.

[0095] Step 1.8: The photovoltaic tracking system maintains this angle.

[0096] Step 1.9, determine whether the current time is 9:00 a.m.; if so, enter the normal tracking mode; if not, enter step 1.2.

[0097] In this embodiment, in the morning time period, by analyzing the sudden drop in the photovoltaic string current and combining the changes in irradiation data to assist in judging the authenticity of the shadow occlusion, the power generation of the photovoltaic tracking system in the morning time is improved.

[0098] In this embodiment, if Figure 3 As shown, the present invention provides a method for increasing the power generation of a photovoltaic tracking system, which is applied to the time period before sunset in the afternoon, and specifically includes:

[0099] Step 2.1: In the normal tracking mode, the PV string current (I1, I2...In, In+1) is collected in real time after 3:00 p.m. local time, and the irradiation data (R1, R2...Rn, Rn+1) is collected continuously.

[0100] Step 2.2, calculate ΔI1, ΔI2, ..., ΔIn, ΔIn+1, and calculate ΔR1, ΔR2, ..., ΔRn, ΔRn+1.

[0101] Step 2.3: Determine whether ΔIn suddenly and significantly exceeds ΔRn; if so, proceed to step 2.4; if not, proceed to step 2.1.

[0102] Step 2.4: When ΔIn suddenly and significantly exceeds ΔRn, the angle of the photovoltaic tracking system rotates in the opposite direction.

[0103] Step 2.5, collect the string current (In+2...Im, Im+1) in real time, and continuously collect the irradiation data (Rn+2...Rm, Rm+1).

[0104] Step 2.6, calculate ΔIn+1…ΔIm, calculate ΔRn+1…ΔRm.

[0105] Step 2.7: Determine whether ΔIm and ΔRm are similar; if so, proceed to step 2.8; if not, proceed to step 2.4.

[0106] Step 2.8: The photovoltaic tracking system maintains this angle.

[0107] Step 2.9, determine whether the current time has reached the local sunset time; if so, enter the normal tracking mode; if not, enter step 2.2.

[0108] In this embodiment, in the afternoon time period, by analyzing the sudden drop in the photovoltaic string current and combining the changes in the irradiation data to assist in judging the authenticity of the shading, the power generation of the photovoltaic tracking system in the afternoon time is improved.

[0109] In this embodiment, it is highly applicable to terrain with large undulations and where the photovoltaic tracking system in the array is easily obscured, and has a high power generation gain. The current collection method of this solution is highly stable, and the implementation of the solution has the characteristics of convenient and fast post-installation, wide measurement range, and high accuracy. It can more accurately grasp whether the power generation of the photovoltaic tracking system is affected. At the same time, it monitors in real time whether the power generation of the photovoltaic tracking system is obscured by shadows, and makes timely response strategies to reduce power generation losses and increase power generation revenue.

[0110] In one embodiment, the present invention provides a device for increasing power generation of a photovoltaic tracking system, comprising:

[0111] The acquisition module is used to acquire the current value of one or more photovoltaic strings of the photovoltaic tracking system.

[0112] The judgment module is used to analyze the change state of the current value of the photovoltaic string in combination with the change state of the irradiation data in the corresponding time period, and judge the shadow shielding situation of the photovoltaic tracking system.

[0113] The adjustment module is used to adjust the tracking angle of the photovoltaic tracking system if it is determined that the photovoltaic tracking system is shadowed, so as to eliminate the shadow of the photovoltaic tracking system.

[0114] In this embodiment, the device can collect the photovoltaic string current nearby, and the shielding situation of the strings on the photovoltaic tracking system can be fed back in real time, directly and accurately. At the same time, the photovoltaic string current is collected nearby, the solution is easy to implement, and the material and installation labor costs are low. The device can stably, real-timely and accurately detect the string current size, effectively avoid shadows, and increase power generation benefits.

[0115] In one embodiment, the invention further comprises: a selection module for:

[0116] According to the project terrain information of the photovoltaic tracking system, a terrain area with a slope is selected to collect the photovoltaic string current value.

[0117] In one embodiment, the acquisition module is used to:

[0118] A current sensor is provided, and the photovoltaic string cables of the photovoltaic tracking system are passed through the current sensor. The current sensor collects the photovoltaic string current value on the photovoltaic tracking system in real time.

[0119] In one embodiment, the invention further comprises: a comparison module, which is used to:

[0120] The photovoltaic assembly current values ​​obtained by more than one current sensor are compared, and the photovoltaic string current value with a larger current change is used as a basis for judging the shadow shielding condition of the photovoltaic tracking system.

[0121] The largest photovoltaic string current value between the photovoltaic string current value at the middle position of the photovoltaic tracking system and the photovoltaic string current value at the end position of the photovoltaic tracking system is used as the photovoltaic string current value for judging the shading condition of the photovoltaic tracking system.

[0122] This embodiment uses a current sensor (such as an open-and-close Hall current sensor) and other devices to collect the photovoltaic string current in real time from the photovoltaic string DC cable near the photovoltaic tracking system controller. The details of this solution are as follows: the photovoltaic string DC cable near the photovoltaic tracking system controller is passed through the current sensor to collect the photovoltaic string current value on the photovoltaic tracking system in real time; in the morning and evening time periods, the sudden drop of the photovoltaic string current is analyzed, combined with the change of irradiation data to assist in judging the authenticity of the shading; if shading occurs, the angle of the photovoltaic tracking system is adjusted to rotate in the opposite direction of the sun's movement to eliminate the shadow shading of the photovoltaic tracking system.

[0123] Those skilled in the art can clearly understand that, for the convenience and simplicity of description, only the division of the above-mentioned program modules is used as an example for illustration. In actual applications, the above-mentioned functions can be assigned to different program modules as needed, that is, the internal structure of the device can be divided into different program units or modules to complete all or part of the functions described above. The program modules in the embodiment can be integrated into a processing unit, or each unit can exist physically separately, or two or more units can be integrated into a processing unit, and the above-mentioned integrated unit can be implemented in the form of hardware or in the form of software program units. In addition, the specific names of the program modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application.

[0124] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0125] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented with electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed with hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0126] In the embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. Exemplarily, the device embodiments described above are merely schematic. Exemplarily, the division of the modules or units is only a logical function division. There may be other division methods in actual implementation. Exemplarily, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, and the indirect coupling or communication connection of the device or unit can be electrical, mechanical or other forms.

[0127] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0128] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0129] It should be noted that the above embodiments can be freely combined as needed. The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered as the protection scope of the present invention.

Claims

1. A method for increasing power generation of a photovoltaic tracking system. It is characterized in that include: A current sensor is provided, and a photovoltaic string cable of the photovoltaic tracking system is passed through the current sensor, and the current sensor collects the current value of one or more photovoltaic strings on the photovoltaic tracking system in real time; Combined with the change state of the irradiation data in the corresponding time period, the change state of the current value of the photovoltaic string is compared and analyzed to determine the shadow shielding condition of the photovoltaic tracking system, including: Continuously collecting the photovoltaic string current value as the first photovoltaic string current value, and continuously collecting the irradiation data of the corresponding time period as the first irradiation data; Based on the first photovoltaic string current value and the first irradiance data, respectively calculating a first current change value and a first irradiance change value; If the absolute value of the first current change value and the absolute value of the first irradiance change value maintain a linear relationship, it is determined that no shadowing occurs in the photovoltaic tracking system; If the absolute value of the first current change value exceeds a preset range of the absolute value of the first irradiance change value, it is determined that shadowing occurs in the photovoltaic tracking system; If it is determined that the photovoltaic tracking system is shaded, the photovoltaic tracking system is adjusted to rotate in the opposite direction of the sun to increase the tracking angle of the photovoltaic tracking system; Continue to collect the photovoltaic string current value as the second photovoltaic string current value, and continue to collect the irradiation data of the corresponding time period as the second irradiation data; Based on the second photovoltaic string current value and the second irradiance data, respectively calculating a second current change value and a second irradiance change value; If the absolute value of the second current change value and the absolute value of the second irradiance change value maintain a linear relationship, it is determined that the photovoltaic tracking system has eliminated the shadow shading; otherwise, the photovoltaic tracking system is adjusted to continue rotating in the opposite direction of the sun's movement to eliminate the shadow shading of the photovoltaic tracking system.

2. The method for increasing power generation of a photovoltaic tracking system according to claim 1, It is characterized in that Also includes: The photovoltaic assembly current values ​​obtained by more than one current sensor are compared, and the photovoltaic string current value with a larger current change is used as a basis for judging the shadow shielding condition of the photovoltaic tracking system.

3. A device for increasing the power generation of a photovoltaic tracking system, It is characterized in that include: A collection module, used for collecting the current value of one or more photovoltaic strings of the photovoltaic tracking system in real time; The judgment module is used to analyze the change state of the photovoltaic string current value in combination with the change state of the irradiation data in the corresponding time period to judge the shadow shielding condition of the photovoltaic tracking system, including: Continuously collecting the photovoltaic string current value as the first photovoltaic string current value, and continuously collecting the irradiation data of the corresponding time period as the first irradiation data; Based on the first photovoltaic string current value and the first irradiance data, respectively calculating a first current change value and a first irradiance change value; If the absolute value of the first current change value and the absolute value of the first irradiance change value maintain a linear relationship, it is determined that no shadowing occurs in the photovoltaic tracking system; If the absolute value of the first current change value exceeds a preset range of the absolute value of the first irradiance change value, it is determined that shadowing occurs in the photovoltaic tracking system; The adjustment module is used to adjust the photovoltaic tracking system to rotate in the opposite direction of the sun's movement if it is determined that the photovoltaic tracking system is shadowed, until it is determined that the photovoltaic tracking system has eliminated the shadow; otherwise, the photovoltaic tracking system is adjusted to continue rotating in the opposite direction of the sun's movement to eliminate the shadow of the photovoltaic tracking system.

4. The device for increasing the power generation of a photovoltaic tracking system according to claim 3, It is characterized in that The judgment module also includes a comparison module, which is used to: The photovoltaic component current values ​​obtained by more than one current sensor are compared, and the photovoltaic string current value with a larger current change is used as a basis for judging the shadow shielding condition of the photovoltaic tracking system.

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