PV energy tracking method and device for photovoltaic system

Abstract

The present application relates to a PV energy tracking method and device applied to a photovoltaic system, which collects the PV voltage as the initial open circuit voltage, and determines the initial given voltage based on the initial open circuit voltage. The PV power and the PV starting power are collected and compared, and when the PV power is less than the PV starting power, the PV voltage is refreshed to update the initial open circuit voltage to obtain a refreshed open circuit voltage. The refreshed given voltage is determined based on the refreshed open circuit voltage, and PV voltage tracking and PV current limiting are performed based on the refreshed given voltage. By refreshing the open circuit, the PV voltage can track the maximum power voltage point faster without being clamped for a long time, which facilitates the rapid detection of a higher open circuit voltage, and then operates at a relatively high PV voltage, so that the energy utilization rate of the PV is improved.

Description

Technical Field

[0001] The present application relates to the field of photovoltaic energy scheduling technology, and in particular to a PV energy tracking method and device applied to a photovoltaic system. Background Art

[0002] Photovoltaic (PV) refers to a system that uses semiconductor materials to convert light energy into electrical energy, thereby producing the photovoltaic effect. The derived industrial product is the photovoltaic panel. Photovoltaic panels absorb sunlight and convert solar radiation energy directly or indirectly into electrical energy through the photoelectric effect or photochemical effect. When combined with external electrical connection lines, photovoltaic panel tracking control equipment or energy storage equipment, a photovoltaic system that utilizes light energy is formed.

[0003] In the photovoltaic system, since the PV current of the photovoltaic panel is relatively small in the morning and evening, during the PV photovoltaic panel tracking process, the initial open circuit voltage is relatively low. Then, when it is quickly tracked to the voltage point related to the open circuit voltage, the PV energy is insufficient, resulting in the failure to reach the PV startup power. Then it will enter the clamping state, causing the PV voltage to remain at a very low voltage for a long time. During this period, the PV current rises very slowly and changes very little, which causes the PV power detected by the machine to never reach the startup power. However, at this time, the actual open circuit voltage of the photovoltaic panel has increased, but due to the algorithm defects of the existing solution, the PV voltage is low for a long time, and the power is low, which ultimately causes the problem of low PV energy utilization. Summary of the invention

[0004] In order to cope with the problem that when the actual open-circuit voltage of the photovoltaic panel increases, the PV voltage and power are low for a long time, resulting in low PV energy utilization, a PV energy tracking method and device applied to a photovoltaic system are provided.

[0005] The present disclosure provides a PV energy tracking method for a photovoltaic system, comprising the steps of:

[0006] Collecting the PV voltage as an initial open circuit voltage, and determining an initial given voltage according to the initial open circuit voltage;

[0007] Collect and compare PV power and PV startup power;

[0008] When the PV power is less than the PV starting power, refreshing the PV voltage to update the initial open circuit voltage to obtain a refreshed open circuit voltage;

[0009] A refresh given voltage is determined according to the refresh open circuit voltage, and PV voltage tracking and PV current limiting are performed according to the refresh given voltage.

[0010] The PV energy tracking method applied to the photovoltaic system of the embodiment of the present disclosure collects the PV voltage as the initial open circuit voltage, and determines the initial given voltage based on the initial open circuit voltage. The PV power and the PV starting power are collected and compared. When the PV power is less than the PV starting power, the PV voltage is refreshed to update the initial open circuit voltage to obtain a refreshed open circuit voltage. The refreshed given voltage is determined based on the refreshed open circuit voltage, and PV voltage tracking and PV current limiting are performed based on the refreshed given voltage. By refreshing the open circuit, the PV voltage can track the maximum power voltage point more quickly without being clamped for a long time, which facilitates the rapid detection of a higher open circuit voltage, and then operates at a relatively high PV voltage, so that the energy utilization rate of the PV is improved.

[0011] As one of the optional embodiments, the method further includes the steps of:

[0012] When the PV power is greater than or equal to the PV starting power, the PV voltage tracking is exited and the setting circuit tracking is executed.

[0013] As one of the optional embodiments, the process of collecting and comparing PV power and PV startup power includes the steps of:

[0014] When the PV voltage quickly tracks to the initial given voltage, the PV power and PV startup power are collected and compared.

[0015] As one of the optional embodiments, the process of determining a refreshed given voltage according to the refreshed open circuit voltage, and performing PV voltage tracking and PV current limiting according to the refreshed given voltage comprises the steps of:

[0016] Implement current limiting on PV current;

[0017] When the current limiting satisfies the set current limiting condition, a refresh given voltage is determined according to the refresh open circuit voltage, and PV voltage tracking and PV current limiting are performed according to the refresh given voltage.

[0018] As one of the optional embodiments, the current limiting condition is that the PV current is 0.

[0019] As one of the optional embodiments, the initial given voltage is the product of the initial open circuit voltage and a first set ratio;

[0020] The refresh given voltage is the product of the refresh open circuit voltage and a second set ratio.

[0021] As one of the optional embodiments, the setting circuit tracking includes MPPT three-point tracking.

[0022] The embodiment of the present disclosure provides a PV energy tracking device applied to a photovoltaic system, comprising:

[0023] An initial acquisition module, used for acquiring a PV voltage as an initial open circuit voltage, and determining an initial given voltage according to the initial open circuit voltage;

[0024] Power comparison module, used to collect and compare PV power and PV starting power;

[0025] A voltage refreshing module, used for refreshing the PV voltage to update the initial open-circuit voltage and obtain a refreshed open-circuit voltage when the PV power is less than the PV starting power;

[0026] The energy processing module is used to determine a refresh given voltage according to the refresh open circuit voltage, and perform PV voltage tracking and PV current limiting according to the refresh given voltage.

[0027] The above-mentioned PV energy tracking device applied to the photovoltaic system collects the PV voltage as the initial open circuit voltage, and determines the initial given voltage based on the initial open circuit voltage. The PV power and PV starting power are collected and compared. When the PV power is less than the PV starting power, the PV voltage is refreshed to update the initial open circuit voltage to obtain the refreshed open circuit voltage. The refreshed given voltage is determined based on the refreshed open circuit voltage, and PV voltage tracking and PV current limiting are performed based on the refreshed given voltage. By refreshing the open circuit, the PV voltage can track the maximum power voltage point more quickly without being clamped for a long time, which facilitates the rapid detection of a higher open circuit voltage, and then operates at a relatively high PV voltage, so that the energy utilization rate of PV is improved.

[0028] At least one embodiment of the present disclosure further provides a data control device, including:

[0029] one or more memories non-transitorily storing computer-executable instructions;

[0030] One or more processors are configured to execute computer executable instructions, wherein the computer executable instructions, when executed by the one or more processors, implement the PV energy tracking method applied to a photovoltaic system according to any embodiment of the present disclosure.

[0031] The above-mentioned data control device collects the PV voltage as the initial open circuit voltage, and determines the initial given voltage based on the initial open circuit voltage. The PV power and PV starting power are collected and compared. When the PV power is less than the PV starting power, the PV voltage is refreshed to update the initial open circuit voltage to obtain the refreshed open circuit voltage. The refreshed given voltage is determined based on the refreshed open circuit voltage, and PV voltage tracking and PV current limiting are performed based on the refreshed given voltage. By refreshing the open circuit, the PV voltage can track the maximum power voltage point more quickly without being clamped for a long time, which facilitates the rapid detection of a higher open circuit voltage, and then operates at a relatively high PV voltage, so that the energy utilization rate of PV is improved.

[0032] At least one embodiment of the present disclosure further provides a non-transitory computer-readable storage medium, wherein the non-transitory computer-readable storage medium stores computer-executable instructions, and when the computer-executable instructions are executed by a processor, a PV energy tracking method applied to a photovoltaic system according to any embodiment of the present disclosure is implemented.

[0033] The above-mentioned non-transient computer-readable storage medium collects the PV voltage as the initial open circuit voltage, and determines the initial given voltage based on the initial open circuit voltage. The PV power and the PV starting power are collected and compared. When the PV power is less than the PV starting power, the PV voltage is refreshed to update the initial open circuit voltage to obtain a refreshed open circuit voltage. The refreshed given voltage is determined based on the refreshed open circuit voltage, and PV voltage tracking and PV current limiting are performed based on the refreshed given voltage. By refreshing the open circuit, the PV voltage can track the maximum power voltage point more quickly without being clamped for a long time, which facilitates the rapid detection of a higher open circuit voltage, and then operates at a relatively high PV voltage, so that the energy utilization rate of the PV is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A flow chart of a PV energy tracking method applied to a photovoltaic system according to a disclosed embodiment;

[0035] Figure 2 A flow chart of a PV energy tracking method applied to a photovoltaic system according to a preferred disclosed embodiment;

[0036] Figure 3 A flow chart of a PV energy tracking method applied to a photovoltaic system according to another preferred disclosed embodiment;

[0037] Figure 4 A module structure diagram of a PV energy tracking device applied to a photovoltaic system according to a disclosed embodiment;

[0038] Figure 5 A schematic block diagram of a data control device provided for at least one embodiment of the present disclosure;

[0039] Figure 6 A schematic diagram of a non-transitory computer-readable storage medium provided for at least one embodiment of the present disclosure. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0041] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0042] In order to keep the following description of the embodiments of the present disclosure clear and concise, the present disclosure omits detailed descriptions of some known functions and known components.

[0043] The embodiments of the present disclosure provide a PV energy tracking method applied to a photovoltaic system.

[0044] Figure 1 FIG. 1 is a flow chart of a PV energy tracking method applied to a photovoltaic system according to a disclosed embodiment. Figure 1 As shown, a PV energy tracking method applied to a photovoltaic system according to a disclosed embodiment includes steps S100 to S103:

[0045] S100, collecting a PV voltage as an initial open circuit voltage, and determining an initial given voltage according to the initial open circuit voltage;

[0046] S101, collecting and comparing PV power and PV starting power;

[0047] S102, when the PV power is less than the PV starting power, refreshing the PV voltage to update the initial open circuit voltage to obtain a refreshed open circuit voltage;

[0048] S103, determining a refresh given voltage according to the refresh open circuit voltage, and performing PV voltage tracking and PV current limiting according to the refresh given voltage.

[0049] In step S100, the PV voltage is collected as the condition for the initial open circuit voltage, that is, the PV power is less than the PV starting power, for example, when the photovoltaic system machine is started or after the step S103 is refreshed. The PV voltage is collected and the voltage is set as the initial open circuit voltage to complete the initial calibration.

[0050] There is a proportional relationship between the initial given voltage and the initial open circuit voltage, wherein the initial given voltage is smaller than the initial open circuit voltage.

[0051] In one embodiment, the initial given voltage is the product of the initial open circuit voltage and the first set ratio, and the first set ratio is 0.7-0.95. As a preferred implementation, the first set ratio is 0.85.

[0052] After the initial given voltage is calibrated, the PV power and PV starting power are collected and compared. When the PV power is greater than or equal to the PV starting power, it indicates that the photovoltaic system can perform PV output.

[0053] When the PV power is less than or equal to the PV start-up power, one situation is that the photovoltaic output does not meet the conditions in the morning or evening, and there is no available photovoltaic energy. Another situation is that the defects of the original energy management algorithm lead to the failure to start the energy output in time, wasting the energy of the photovoltaic system.

[0054] Based on this, in the embodiment of the present disclosure, when the PV power is less than the PV starting power, the PV voltage is refreshed to update the initial open circuit voltage to obtain a refreshed open circuit voltage.

[0055] There is a proportional relationship between the refresh given voltage and the refresh open circuit voltage, wherein the refresh given voltage is smaller than the refresh open circuit voltage.

[0056] In one embodiment, the refresh given voltage is the product of the refresh open circuit voltage and the second set ratio, and the second set ratio is 0.7-0.95. As a preferred implementation, the second set ratio is 0.85.

[0057] Determining the refresh given voltage is equivalent to recalibrating the initial open circuit voltage. At this time, the refresh given voltage is greater than the initial open circuit voltage, and PV voltage tracking is performed again to release the clamp on the PV voltage, and the execution of the refresh of the PV current limit is coordinated to facilitate the refresh of the PV power and the re-comparison of the PV power and the PV starting power.

[0058] As one example, Figure 2 The flowchart of the PV energy tracking method applied to the photovoltaic system in the preferred disclosed embodiment is as follows: Figure 2 As shown, the process of collecting and comparing PV power and PV starting power in step S101 includes step S200:

[0059] S200, when the PV voltage quickly tracks to the initial given voltage, the PV power and the PV starting power are collected and compared.

[0060] The initial given voltage is used as the clamping voltage standard of the PV voltage, and the PV voltage is pulled up to the initial given voltage by fast tracking. As one of the embodiments, the PV voltage is fast tracked to the initial given voltage by stepping, and the step amount is 3-5V, preferably 4V.

[0061] As one of the embodiments, Figure 2 As shown, the process of determining the refreshed given voltage according to the refreshed open circuit voltage in step S104, and performing PV voltage tracking and PV current limiting according to the refreshed given voltage, includes steps S201 and S202:

[0062] S201, current limiting is performed on the PV current;

[0063] S202, when the current limiting satisfies a set current limiting condition, determining a refresh given voltage according to the refresh open circuit voltage, and performing PV voltage tracking and PV current limiting according to the refresh given voltage.

[0064] In step S201, the PV current is limited to meet the set current limiting condition and then the open circuit voltage is refreshed. The set current limiting condition includes a time condition and / or a current condition. The time condition is used to limit the limit time of the current limiting, and the current condition is used to limit the current size of the current limiting.

[0065] As a preferred embodiment, the time condition is 1-3 minutes, that is, 1-3 minutes for PV current. Preferably, the time condition is 2 minutes.

[0066] As a preferred implementation, the current condition is that the current is less than the set current value, that is, when the PV current is less than the set current value, it is determined that the set current limiting condition is met. Preferably, the set current value is 0.

[0067] As one example, Figure 3 FIG. 1 is a flow chart of a PV energy tracking method applied to a photovoltaic system according to another preferred disclosed embodiment. Figure 3 As shown, another preferred disclosed embodiment of the PV energy tracking method applied to a photovoltaic system further includes step S300:

[0068] S300, when the PV power is greater than or equal to the PV starting power, exit PV voltage tracking and execute setting circuit tracking.

[0069] When the PV power is greater than or equal to the PV starting power, the photovoltaic PV current can be output. At this time, the PV voltage tracking is exited to exit the judgment, and the setting circuit tracking is executed to ensure the policy work of the photovoltaic system. As one of the embodiments, the setting circuit tracking includes MPPT three-point tracking.

[0070] The PV energy tracking method applied to the photovoltaic system of the embodiment of the present disclosure collects the PV voltage as the initial open circuit voltage, and determines the initial given voltage based on the initial open circuit voltage. The PV power and the PV starting power are collected and compared. When the PV power is less than the PV starting power, the PV voltage is refreshed to update the initial open circuit voltage to obtain a refreshed open circuit voltage. The refreshed given voltage is determined based on the refreshed open circuit voltage, and PV voltage tracking and PV current limiting are performed based on the refreshed given voltage. By refreshing the open circuit, the PV voltage can track the maximum power voltage point more quickly without being clamped for a long time, which facilitates the rapid detection of a higher open circuit voltage, and then operates at a relatively high PV voltage, so that the energy utilization rate of the PV is improved.

[0071] The disclosed embodiment also provides a PV energy tracking device applied to a photovoltaic system.

[0072] Figure 4 FIG. 1 is a block diagram of a PV energy tracking device module applied to a photovoltaic system according to a disclosed embodiment. Figure 4 As shown, a PV energy tracking device applied to a photovoltaic system in one embodiment includes:

[0073] The initial acquisition module 100 is used to acquire the PV voltage as the initial open circuit voltage and determine the initial given voltage according to the initial open circuit voltage;

[0074] A power comparison module 101 is used to collect and compare PV power and PV starting power;

[0075] A voltage refreshing module 102, configured to refresh the PV voltage to update the initial open circuit voltage and obtain a refreshed open circuit voltage when the PV power is less than the PV starting power;

[0076] The energy processing module 103 is used to determine a refresh given voltage according to the refresh open circuit voltage, and perform PV voltage tracking and PV current limiting according to the refresh given voltage.

[0077] The above-mentioned PV energy tracking device applied to the photovoltaic system collects the PV voltage as the initial open circuit voltage, and determines the initial given voltage based on the initial open circuit voltage. The PV power and PV starting power are collected and compared. When the PV power is less than the PV starting power, the PV voltage is refreshed to update the initial open circuit voltage to obtain the refreshed open circuit voltage. The refreshed given voltage is determined based on the refreshed open circuit voltage, and PV voltage tracking and PV current limiting are performed based on the refreshed given voltage. By refreshing the open circuit, the PV voltage can track the maximum power voltage point more quickly without being clamped for a long time, which facilitates the rapid detection of a higher open circuit voltage, and then operates at a relatively high PV voltage, so that the energy utilization rate of PV is improved.

[0078] At least one embodiment of the present disclosure further provides a data control device. Figure 5 A schematic block diagram of a data control device provided by at least one embodiment of the present disclosure. Figure 5 As shown, the data control device 20 may include one or more memories 200 and one or more processors 201. The memory 200 is used to store computer executable instructions non-transiently; the processor 201 is used to run the computer executable instructions, and when the computer executable instructions are run by the processor 201, the processor 201 may execute one or more steps in the PV energy tracking method applied to the photovoltaic system according to any embodiment of the present disclosure.

[0079] The specific implementation and related explanation of each step of the PV energy tracking method applied to the photovoltaic system can be found in the above-mentioned embodiment of the PV energy tracking method applied to the photovoltaic system, which will not be elaborated here. Figure 5 The components of the data control device 20 shown are merely exemplary and non-limiting. The data control device 20 may also have other components according to actual application requirements.

[0080] In one embodiment, the processor 201 and the memory 200 can communicate with each other directly or indirectly. For example, the processor 201 and the memory 200 can communicate via a network connection. The network may include a wireless network, a wired network, and / or any combination of a wireless network and a wired network, and the present disclosure does not limit the type and function of the network. For another example, the processor 201 and the memory 200 can also communicate via a bus connection. The bus may be a peripheral component interconnect standard (PCI) bus or an extended industrial standard architecture (EISA) bus, etc. For example, the processor 201 and the memory 200 may be arranged at a remote data server end (cloud) or a distributed energy system end (local end), or may be arranged at a client end (e.g., a mobile device such as a mobile phone). For example, the processor 201 may be a device having data processing capability and / or instruction execution capability such as a central processing unit (CPU), a tensor processor (TPU), or a graphics processor GPU, and may control other components in the data prediction device 20 to perform desired functions. The central processing unit (CPU) may be an X86 or ARM architecture, etc.

[0081] In one embodiment, the memory 200 may include any combination of one or more computer program products, and the computer program product may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. Volatile memory may include, for example, random access memory (RAM) and / or cache memory (cache), etc. Non-volatile memory may include, for example, read-only memory (ROM), hard disk, erasable programmable read-only memory (EPROM), portable compact disk read-only memory (CD-ROM), USB memory, flash memory, etc. One or more computer executable instructions may be stored on the computer-readable storage medium, and the processor 201 may execute the computer executable instructions to implement various functions of the data prediction device 20. Various applications and various data, as well as various data used and / or generated by the application, etc. may also be stored in the memory 200.

[0082] It should be noted that the data control device 20 can achieve technical effects similar to those of the aforementioned PV energy tracking method applied to the photovoltaic system, and the repeated parts will not be repeated.

[0083] At least one embodiment of the present disclosure also provides a non-transitory computer-readable storage medium. Figure 6 A schematic diagram of a non-transitory computer-readable storage medium provided for at least one embodiment of the present disclosure. Figure 6As shown, one or more computer executable instructions 301 may be non-transitory stored on a non-transitory computer readable storage medium 30. For example, when the computer executable instructions 301 are executed by a computer, the computer may execute one or more steps in a PV energy tracking method applied to a photovoltaic system according to any embodiment of the present disclosure.

[0084] In one embodiment, the non-transitory computer-readable storage medium 30 may be applied to the above-mentioned data control device 20 , for example, it may be the memory 200 in the data control device 20 .

[0085] In one embodiment, the description of the non-transitory computer-readable storage medium 30 may refer to the description of the memory 200 in the embodiment of the data control device 20, and the repeated parts will not be repeated.

[0086] It should be noted that the memory 200 stores different non-transiently stored computer executable instructions, and the data control device 20 corresponds to a firmware upgrade device. When the computer executable instructions are executed by the processor 201, the processor 201 can execute one or more steps in the PV energy tracking method applied to the photovoltaic system according to any embodiment of the present disclosure.

[0087] There are a few points to note about this disclosure:

[0088] (1) The drawings of the embodiments of the present disclosure only relate to the structures related to the embodiments of the present disclosure, and other structures may refer to the general design.

[0089] (2) For the sake of clarity, the thickness and size of layers or structures are exaggerated in the drawings used to describe the embodiments of the present invention. It is understood that when an element such as a layer, film, region, or substrate is referred to as being "on" or "under" another element, the element may be "directly" "on" or "under" the other element, or there may be intervening elements.

[0090] (3) In the absence of conflict, the embodiments of the present disclosure and the features in the embodiments may be combined with each other to obtain new embodiments. The above are only specific implementations of the present disclosure, but the protection scope of the present disclosure is not limited thereto. The protection scope of the present disclosure shall be subject to the protection scope of the claims.

[0091] The technical features of the above embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0092] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A PV energy tracking method applied to a photovoltaic system, characterized in that: Includes steps: Collecting the PV voltage as an initial open circuit voltage, and determining an initial given voltage according to the initial open circuit voltage; Collect and compare PV power and PV startup power; When the PV power is less than the PV starting power, refreshing the PV voltage to update the initial open circuit voltage to obtain a refreshed open circuit voltage; determining a refresh given voltage according to the refresh open circuit voltage, and performing PV voltage tracking and PV current limiting according to the refresh given voltage; The initial given voltage is the product of the initial open circuit voltage and the first set ratio, and the refreshed given voltage is the product of the refreshed open circuit voltage and the second set ratio; Setting the current limiting condition includes a time condition and / or a current condition, wherein the time condition is used to limit the limit time of the current limiting, and the current condition is used to limit the current size of the current limiting; The time condition is 1-3 minutes, i.e. 1-3 minutes for PV current; The current condition is that it is less than the set current value, that is, when the PV current is less than the set current value, it is determined that the set current limiting condition is met.

2. The PV energy tracking method applied to a photovoltaic system according to claim 1, characterized in that: Also includes the steps: When the PV power is greater than or equal to the PV starting power, the PV voltage tracking is exited and the setting circuit tracking is executed.

3. The PV energy tracking method applied to a photovoltaic system according to claim 1, characterized in that: The process of collecting and comparing PV power and PV starting power includes the following steps: When the PV voltage quickly tracks to the initial given voltage, the PV power and PV startup power are collected and compared.

4. The PV energy tracking method applied to a photovoltaic system according to claim 1, characterized in that: The process of determining a refreshed given voltage according to the refreshed open circuit voltage, and performing PV voltage tracking and PV current limiting according to the refreshed given voltage comprises the steps of: Implement current limiting on PV current; When the current limiting satisfies the set current limiting condition, a refresh given voltage is determined according to the refresh open circuit voltage, and PV voltage tracking and PV current limiting are performed according to the refresh given voltage.

5. The PV energy tracking method applied to a photovoltaic system according to claim 4, characterized in that: The current limiting condition is that the PV current is 0.

6. The PV energy tracking method applied to a photovoltaic system according to claim 2, characterized in that: The setting circuit tracking includes MPPT three-point tracking.

7. A PV energy tracking device for a photovoltaic system, characterized in that: include: An initial acquisition module, used for acquiring a PV voltage as an initial open circuit voltage, and determining an initial given voltage according to the initial open circuit voltage; Power comparison module, used to collect and compare PV power and PV starting power; A voltage refreshing module, used for refreshing the PV voltage to update the initial open-circuit voltage and obtain a refreshed open-circuit voltage when the PV power is less than the PV starting power; an energy processing module, configured to determine a refresh given voltage according to the refresh open circuit voltage, and perform PV voltage tracking and PV current limiting according to the refresh given voltage; The initial given voltage is the product of the initial open circuit voltage and the first set ratio, and the refreshed given voltage is the product of the refreshed open circuit voltage and the second set ratio; Setting the current limiting condition includes a time condition and / or a current condition, wherein the time condition is used to limit the limit time of the current limiting, and the current condition is used to limit the current size of the current limiting; The time condition is 1-3 minutes, i.e. 1-3 minutes for PV current; The current condition is that it is less than the set current value, that is, when the PV current is less than the set current value, it is determined that the set current limiting condition is met.

8. A non-transitory computer-readable storage medium, characterized in that: The non-transitory computer-readable storage medium stores computer-executable instructions, and when the computer-executable instructions are executed by a processor, the PV energy tracking method applied to a photovoltaic system as described in any one of claims 1 to 6 is implemented.

9. A data control device, characterized in that: include: one or more memories non-transitorily storing computer-executable instructions; One or more processors are configured to run computer executable instructions, wherein the computer executable instructions, when executed by the one or more processors, implement the PV energy tracking method applied to a photovoltaic system as described in any one of claims 1 to 6.

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