Photovoltaic shadow multi-pole scanning method and device

Abstract

The invention relates to a photovoltaic shadow multi-pole scanning method and device. The method comprises the steps that open-circuit voltage is collected, and expected voltage is set according to the open-circuit voltage; controlling the PV voltage to scan from the open-circuit voltage to the expected voltage at a set speed, and obtaining the maximum power in the scanning process and a voltage point corresponding to the maximum power; running to a maximum power voltage point; wherein the maximum power voltage point is the voltage point corresponding to the maximum power. According to the method, the open-circuit voltage is scanned to the expected voltage until the global maximum power point is found, the real global maximum power point can be tracked according to the multi-pole characteristic under the local shadow of the photovoltaic panel, and photovoltaic energy waste and efficiency reduction caused by falling into a local peak value are avoided.

Description

Technical Field

[0001] The present application relates to the technical field of maximum power point tracking, and in particular to a photovoltaic shadow multi-pole scanning method and device. Background Art

[0002] Maximum power point tracking (MPPT) is a technology used in photovoltaic solar energy systems. Its function is to track the maximum power point of photovoltaic panels to improve energy conversion efficiency. Specifically, photovoltaic solar energy systems may be connected to inverters, external power grids, battery packs, or other electronic loads. But no matter what load is connected, the problem that maximum power point tracking has to deal with is similar, that is, the efficiency of solar cell power transmission is related to the amount of sunlight shining on the solar panel and the electronic characteristics of the load. When the sunlight conditions change, the load curve that can provide the maximum power transmission efficiency also changes accordingly. If the load can be adjusted to match the load curve with the highest power transmission efficiency, the system will have the best efficiency. The load characteristic with the highest power transmission efficiency is called the maximum power point. And maximum power point tracking is to find the maximum power point through an algorithm and maintain the load characteristics at this power point.

[0003] However, in actual applications, the output characteristics of photovoltaic panels may be nonlinear due to local shadows, showing multiple peak points. In this case, the traditional single-peak MPPT algorithm may not be able to accurately track the global maximum power point, thereby reducing the power generation efficiency of the system. Summary of the invention

[0004] Based on this, in actual applications, photovoltaic panels may have nonlinear output characteristics due to local shadows, which manifests as multiple peak points, resulting in the traditional single-pole MPPT algorithm may not be able to accurately track the global maximum power point, thereby reducing the power generation efficiency of the system. The embodiments of the present disclosure provide a photovoltaic shadow multi-pole scanning method and device.

[0005] The embodiment of the present disclosure provides a photovoltaic shadow multi-pole scanning method, comprising the steps of: collecting an open circuit voltage and setting an expected voltage according to the open circuit voltage; Controlling the PV voltage to scan from the open circuit voltage to the expected voltage at a set speed, and obtaining the maximum power of the scanning process and the voltage point corresponding to the maximum power; Run to the maximum power voltage point; wherein the maximum power voltage point is the voltage point corresponding to the maximum power.

[0006] The photovoltaic shadow multi-pole scanning method of the disclosed embodiment collects the open circuit voltage and sets the expected voltage according to the open circuit voltage; controls the PV voltage to scan from the open circuit voltage to the expected voltage at a set speed, obtains the maximum power of the scanning process and the voltage point corresponding to the maximum power; runs to the maximum power voltage point; wherein the maximum power voltage point is the voltage point corresponding to the maximum power. Scanning from the open circuit voltage to the expected voltage until the global maximum power point is found, the multi-pole characteristics under the local shadow of the photovoltaic panel can be used to track the true global maximum power point, avoiding falling into the local peak, resulting in photovoltaic energy waste and reduced efficiency.

[0007] As one of the preferred embodiments, before the process of collecting the open circuit voltage and setting the expected voltage according to the open circuit voltage, the process further includes the following steps: The setting function of the MPPT global scan is opened to facilitate the setting by relevant personnel; wherein the relevant personnel can set the relevant parameters of the scan and the relevant parameters of the expected voltage.

[0008] As one of the preferred embodiments, before the process of collecting the open circuit voltage and setting the expected voltage according to the open circuit voltage, the process further includes the following steps: Limit the PV current to 0 to return the PV to an open circuit state.

[0009] As one of the preferred embodiments, the process of controlling the PV voltage to scan from the open circuit voltage to the expected voltage at a set speed comprises the steps of: The PV voltage is controlled to scan in a voltage reduction direction at a set speed; wherein the expected voltage is the product of the open circuit voltage and the scanning coefficient.

[0010] As one of the preferred embodiments, the scanning coefficient is 0.2-0.4.

[0011] As one of the preferred embodiments, the scanning coefficient is 0.3.

[0012] As one of the preferred embodiments, after the process of running to the maximum power voltage point, the process further includes the following steps: Perform MPPT three-point tracking.

[0013] The embodiment of the present disclosure also provides a photovoltaic shadow multi-pole scanning device, including: A voltage setting module, used for collecting an open circuit voltage and setting an expected voltage according to the open circuit voltage; A voltage scanning module, used to control the PV voltage to scan from the open circuit voltage to the expected voltage at a set speed, and obtain the maximum power of the scanning process and the voltage point corresponding to the maximum power; A voltage operation module is used to operate to a maximum power voltage point; wherein the maximum power voltage point is a voltage point corresponding to the maximum power.

[0014] The photovoltaic shadow multi-pole scanning device of the disclosed embodiment collects the open circuit voltage and sets the expected voltage according to the open circuit voltage; controls the PV voltage to scan from the open circuit voltage to the expected voltage at a set speed, obtains the maximum power of the scanning process and the voltage point corresponding to the maximum power; runs to the maximum power voltage point; wherein the maximum power voltage point is the voltage point corresponding to the maximum power. Scanning from the open circuit voltage to the expected voltage until the global maximum power point is found, the multi-pole characteristics under the local shadow of the photovoltaic panel can be used to track the true global maximum power point, avoiding falling into the local peak, resulting in photovoltaic energy waste and reduced efficiency.

[0015] At least one embodiment of the present disclosure further provides a data control device, including: 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 photovoltaic shadow multi-pole scanning method according to any embodiment of the present disclosure.

[0016] The above-mentioned data control device collects the open circuit voltage and sets the expected voltage according to the open circuit voltage; controls the PV voltage to scan from the open circuit voltage to the expected voltage at a set speed, obtains the maximum power of the scanning process and the voltage point corresponding to the maximum power; runs to the maximum power voltage point; wherein the maximum power voltage point is the voltage point corresponding to the maximum power. Scanning from the open circuit voltage to the expected voltage until the global maximum power point is found, the multi-pole characteristics under the local shadow of the photovoltaic panel can be used to track the true global maximum power point, avoiding falling into the local peak, resulting in photovoltaic energy waste and reduced efficiency.

[0017] 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 photovoltaic shadow multi-pole scanning method according to any embodiment of the present disclosure is implemented.

[0018] The above-mentioned non-transient computer-readable storage medium collects the open circuit voltage and sets the expected voltage according to the open circuit voltage; controls the PV voltage to scan from the open circuit voltage to the expected voltage at a set speed, obtains the maximum power of the scanning process and the voltage point corresponding to the maximum power; runs to the maximum power voltage point; wherein the maximum power voltage point is the voltage point corresponding to the maximum power. Scanning from the open circuit voltage to the expected voltage until the global maximum power point is found, the multi-pole characteristics under the local shadow of the photovoltaic panel can be used to track the true global maximum power point, avoiding falling into the local peak, resulting in photovoltaic energy waste and reduced efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A flow chart of a photovoltaic shadow multi-pole scanning method according to a disclosed embodiment; Figure 2 A flow chart of a photovoltaic shadow multi-pole scanning method according to a preferred embodiment; Figure 3 A schematic diagram of a photovoltaic shadow multi-pole scanning device module according to a disclosed embodiment; Figure 4 A schematic block diagram of a data control device provided for at least one embodiment of the present disclosure; Figure 5 A schematic diagram of a non-transitory computer-readable storage medium provided for at least one embodiment of the present disclosure. DETAILED DESCRIPTION

[0020] 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.

[0021] 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.

[0022] 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.

[0023] The disclosed embodiment provides a photovoltaic shadow multi-pole scanning method.

[0024] Figure 1 FIG. 1 is a flow chart of a photovoltaic shadow multi-pole scanning method according to a disclosed embodiment. Figure 1 As shown, a photovoltaic shadow multi-pole scanning method of a disclosed embodiment includes steps S100 to S102: S100, collecting an open circuit voltage and setting an expected voltage according to the open circuit voltage; S101, controlling the PV voltage to scan from the open circuit voltage to the expected voltage at a set speed, obtaining the maximum power of the scanning process and the voltage point corresponding to the maximum power; S102, running to a maximum power voltage point; wherein the maximum power voltage point is a voltage point corresponding to the maximum power.

[0025] The disclosed embodiment is applied to a photovoltaic system with photovoltaic panels, where a single or multiple photovoltaic panels are connected in series to form a higher voltage, namely, the PV voltage, and the corresponding loop current is the PV current. At the same time, the open circuit voltage is the nominal voltage, which is the voltage value of the photovoltaic panel under peak light conditions, without any load connected and without current output. Based on this, in the disclosed embodiment, the associated execution module can collect data information of the photovoltaic panel and the corresponding modules at the back end (such as inverters and energy storage systems).

[0026] In the execution module, the open circuit voltage of the photovoltaic panel is collected, and the expected voltage is set according to the open circuit voltage.

[0027] As one of the better implementation methods, Figure 2FIG. 1 is a flow chart of a photovoltaic shadow multi-pole scanning method according to a preferred embodiment. Figure 2 As shown, before the process of collecting the open circuit voltage and setting the expected voltage according to the open circuit voltage in step S100, step S200 is also included: S200, opening the setting function of the MPPT global scan to facilitate the setting by relevant personnel; wherein, the relevant personnel can set the relevant parameters of the scan and the relevant parameters of the expected voltage.

[0028] In the disclosed embodiment, the execution module executes the technical solution of any embodiment based on the original MPPT global scanning functional basis. By applying the original MPPT global scanning functional basis, the execution module reduces the amount of data for implementing various processes, ensures response speed and reduces data redundancy.

[0029] The speed and direction of the scan can be controlled by setting the relevant parameters of the scan. At the same time, the magnitude of the expected voltage can be adjusted by setting the relevant parameters of the expected voltage to control the range of the scan.

[0030] As one of the better implementation methods, Figure 2 As shown, before the process of collecting the open circuit voltage and setting the expected voltage according to the open circuit voltage in step S100, step S201 is also included: S201, limiting the PV current to 0 to return the PV to an open circuit state.

[0031] By limiting the PV current, the PV is returned to the open circuit state, which facilitates the rapid execution and cyclic execution of the scan and reduces the impact of the PV returning to the open circuit state on the overall system.

[0032] After the initial setting is completed, the PV voltage is controlled to scan from the open circuit voltage as the starting point and scan toward the expected voltage side. According to the working characteristics of the photovoltaic panel, the expected voltage may be less than or greater than the open circuit voltage.

[0033] Preferably, the expected voltage is less than the open circuit voltage. Figure 2 As shown, the process of controlling the PV voltage to scan from the open circuit voltage to the expected voltage at a set speed in step S101 includes step S202: S202, controlling the PV voltage to scan in a voltage reduction direction at a set speed; wherein the expected voltage is the product of the open circuit voltage and a scanning coefficient.

[0034] As one of the optional embodiments, the scanning coefficient is 0.2-0.4. Preferably, the scanning coefficient is 0.3.

[0035] As one of the specific embodiments, the setting function of opening the MPPT global scan is provided to the user by opening the corresponding registers, including function enable, scan time, and scan speed. After the photovoltaic system is turned on, the countdown begins, and the global scan flag is set when the countdown time is up. After receiving the global scan flag, the PV current is limited to 0, and the PV returns to the open circuit state. Sample the open circuit voltage, set the expected voltage to the open circuit voltage * 0.3V, and then start to slowly decrease the PV from the open circuit voltage at the set speed, and sample the PV power in real time for comparison, and record the PV voltage at the maximum PV power. At this time, the PV scans the expected voltage, exits the global scan logic, clears the global scan flag, and then runs to the maximum power voltage point scanned.

[0036] Preferably, if Figure 2 As shown, after the process of running to the maximum power voltage point in step S102, the following steps are also included: S203, executing MPPT three-point tracking.

[0037] After completing the multi-point scan and determining the maximum power voltage point, perform MPPT three-point tracking to continuously maintain maximum power tracking.

[0038] The photovoltaic shadow multi-pole scanning method of the disclosed embodiment collects the open circuit voltage and sets the expected voltage according to the open circuit voltage; controls the PV voltage to scan from the open circuit voltage to the expected voltage at a set speed, obtains the maximum power of the scanning process and the voltage point corresponding to the maximum power; runs to the maximum power voltage point; wherein the maximum power voltage point is the voltage point corresponding to the maximum power. Scanning from the open circuit voltage to the expected voltage until the global maximum power point is found, the multi-pole characteristics under the local shadow of the photovoltaic panel can be used to track the true global maximum power point, avoiding falling into the local peak, resulting in photovoltaic energy waste and reduced efficiency.

[0039] The disclosed embodiment also provides a photovoltaic shadow multi-pole scanning device.

[0040] Figure 3 FIG. 1 is a module structure diagram of a photovoltaic shadow multi-pole scanning device according to a disclosed embodiment. Figure 3 As shown, a photovoltaic shadow multi-pole scanning device according to one embodiment includes: A voltage setting module 100, for collecting an open circuit voltage and setting an expected voltage according to the open circuit voltage; A voltage scanning module 101 is used to control the PV voltage to scan from the open circuit voltage to the expected voltage at a set speed, and obtain the maximum power of the scanning process and the voltage point corresponding to the maximum power; The voltage operation module 102 is used to operate to a maximum power voltage point; wherein the maximum power voltage point is a voltage point corresponding to the maximum power.

[0041] The photovoltaic shadow multi-pole scanning device of the disclosed embodiment collects the open circuit voltage and sets the expected voltage according to the open circuit voltage; controls the PV voltage to scan from the open circuit voltage to the expected voltage at a set speed, obtains the maximum power of the scanning process and the voltage point corresponding to the maximum power; runs to the maximum power voltage point; wherein the maximum power voltage point is the voltage point corresponding to the maximum power. Scanning from the open circuit voltage to the expected voltage until the global maximum power point is found, the multi-pole characteristics under the local shadow of the photovoltaic panel can be used to track the true global maximum power point, avoiding falling into the local peak, resulting in photovoltaic energy waste and reduced efficiency.

[0042] At least one embodiment of the present disclosure further provides a data control device. Figure 4 A schematic block diagram of a data control device provided by at least one embodiment of the present disclosure. Figure 4 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 photovoltaic shadow multi-pole scanning method according to any embodiment of the present disclosure.

[0043] The specific implementation and related explanation of each step of the photovoltaic shadow multi-pole scanning method can be found in the above-mentioned photovoltaic shadow multi-pole scanning method embodiment, which will not be repeated here. Figure 4 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.

[0044] 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.

[0045] 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.

[0046] It should be noted that the data control device 20 can achieve technical effects similar to those of the aforementioned photovoltaic shadow multi-pole scanning method, and the repeated parts will not be repeated.

[0047] At least one embodiment of the present disclosure also provides a non-transitory computer-readable storage medium. Figure 5 A schematic diagram of a non-transitory computer-readable storage medium provided for at least one embodiment of the present disclosure. Figure 5As 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 the photovoltaic shadow multi-pole scanning method according to any embodiment of the present disclosure.

[0048] 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 .

[0049] 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.

[0050] 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 photovoltaic shadow multi-pole scanning method according to any embodiment of the present disclosure.

[0051] There are a few points to note about this disclosure: (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.

[0052] (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.

[0053] (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.

[0054] The technical features of the above embodiments may be combined arbitrarily. 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.

[0055] 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 photovoltaic shadow multi-pole scanning method, characterized in that: Includes steps: collecting an open circuit voltage and setting an expected voltage according to the open circuit voltage; Controlling the PV voltage to scan from the open circuit voltage to the expected voltage at a set speed, and obtaining the maximum power of the scanning process and the voltage point corresponding to the maximum power; Run to the maximum power voltage point; wherein the maximum power voltage point is the voltage point corresponding to the maximum power.

2. The photovoltaic shadow multi-pole scanning method according to claim 1, characterized in that: Before the process of collecting the open circuit voltage and setting the expected voltage according to the open circuit voltage, the process further includes the following steps: The setting function of the MPPT global scan is opened to facilitate the setting by relevant personnel; wherein the relevant personnel can set the relevant parameters of the scan and the relevant parameters of the expected voltage.

3. The photovoltaic shadow multi-pole scanning method according to claim 1, characterized in that: Before the process of collecting the open circuit voltage and setting the expected voltage according to the open circuit voltage, the process further includes the following steps: Limit the PV current to 0 to return the PV to an open circuit state.

4. The photovoltaic shadow multi-pole scanning method according to claim 1, characterized in that: The process of controlling the PV voltage to scan from the open circuit voltage to the expected voltage at a set speed comprises the steps of: The PV voltage is controlled to scan in a voltage reduction direction at a set speed; wherein the expected voltage is the product of the open circuit voltage and the scanning coefficient.

5. The photovoltaic shadow multi-pole scanning method according to claim 4, characterized in that: The scanning coefficient is 0.2-0.

4.

6. The photovoltaic shadow multi-pole scanning method according to claim 5, characterized in that: The scanning factor is 0.

3.

7. The photovoltaic shadow multi-pole scanning method according to claim 1, characterized in that: After the process of running to the maximum power voltage point, the method further comprises the following steps: Perform MPPT three-point tracking.

8. A photovoltaic shadow multi-pole scanning device, characterized in that: include: A voltage setting module, used for collecting an open circuit voltage and setting an expected voltage according to the open circuit voltage; A voltage scanning module, used to control the PV voltage to scan from the open circuit voltage to the expected voltage at a set speed, and obtain the maximum power of the scanning process and the voltage point corresponding to the maximum power; A voltage operation module is used to operate to a maximum power voltage point; wherein the maximum power voltage point is a voltage point corresponding to the maximum power.

9. 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 photovoltaic shadow multi-pole scanning method as described in any one of claims 1 to 7 is implemented.

10. 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 photovoltaic shadow multi-pole scanning method as described in any one of claims 1 to 7.

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