Charging Control Method, Device and Equipment

Abstract

The present application provides a charging control method, device and equipment, which relates to the field of solar photovoltaic technology. Among them, the method includes determining the estimated maximum output power of a photovoltaic module according to the number of photovoltaic panels connected in parallel in the photovoltaic module and the rated maximum output power of each photovoltaic panel. When the estimated maximum output power is greater than the maximum charging power of a target device, determining the maximum absolute safe number Z of photovoltaic panels connected in parallel for the photovoltaic module according to the rated maximum output power and the maximum charging power; then operating Z photovoltaic panels, and determining the actual maximum output power of each of the Z photovoltaic panels. According to the actual maximum output power of each of the Z photovoltaic panels and the maximum charging power, determining the actual maximum safe number Y of photovoltaic panels connected in parallel for the photovoltaic module; then increasing the number of operating photovoltaic panels according to Z and Y. The technical solution provided by the present application can improve the charging speed of a mobile energy storage device while reducing the occurrence of overcurrent situations.

Description

Technical Field

[0001] The present application relates to the technical field of solar photovoltaics, and particularly to a charging control method, device, and equipment. Background Art

[0002] With the development of solar photovoltaic technology, the combination of photovoltaic modules and mobile energy storage devices has been widely used in scenarios such as outdoors, remote areas, construction sites, and rescue sites without energy supply, because after the mobile energy storage device is used, the battery of the mobile energy storage device can be replenished by solar energy outdoors.

[0003] Compared with the charging speed when charging a mobile energy storage device using alternating current, the charging speed of a photovoltaic module when charging a mobile energy storage device is slower. To address this problem, usually, more photovoltaic panels are connected in parallel to the photovoltaic module to increase the power of the photovoltaic module, thereby increasing the charging speed of the mobile energy storage device.

[0004] However, connecting more photovoltaic panels in parallel will increase the charging power of the photovoltaic module. If the charging power is too large, it will damage the battery of the mobile energy storage device and easily trigger overcurrent or overvoltage protection of the mobile energy storage device, resulting in charging interruption. Summary of the Invention

[0005] In view of this, the present application provides a charging control method, device, and equipment, which can reduce the occurrence of overcharging while increasing the charging speed of the mobile energy storage device.

[0006] To achieve the above object, in a first aspect, an embodiment of the present application provides a charging control method, including:

[0007] Determine the estimated maximum output power of the photovoltaic module according to the number of photovoltaic panels connected in parallel in the photovoltaic module and the rated maximum output power of each photovoltaic panel, where the rated maximum output power of each photovoltaic panel is the same;

[0008] When the estimated maximum output power is greater than the maximum charging power of the target device, determine the maximum absolute safe number Z of photovoltaic panels connected in parallel for the photovoltaic module according to the rated maximum output power and the maximum charging power, where Z is the quotient of the maximum charging power divided by the rated maximum output power;

[0009] Operate Z photovoltaic panels, and determine the actual maximum output power of each of the Z photovoltaic panels. According to the actual maximum output power of each of the Z photovoltaic panels and the maximum charging power, determine the actual maximum safe number Y of photovoltaic panels connected in parallel for the photovoltaic module;

[0010] Increase the number of operating photovoltaic panels according to the maximum absolute safe number of parallel-connected photovoltaic panels Z and the actual maximum safe number of parallel-connected photovoltaic panels Y.

[0011] As an optional implementation manner of an embodiment of the present application, the determining the actual maximum safe number of parallel-connected photovoltaic panels of the photovoltaic module according to the actual maximum output power of each photovoltaic panel in the Z photovoltaic panels and the maximum charging power includes:

[0012] Determine the actual average maximum output power of the Z photovoltaic panels according to the actual maximum output power of each photovoltaic panel in the Z photovoltaic panels;

[0013] Determine the quotient of dividing the maximum charging power by the actual average maximum output power as the actual maximum safe number of parallel-connected photovoltaic panels in the photovoltaic module.

[0014] As an optional implementation manner of an embodiment of the present application, the increasing the number of operating photovoltaic panels according to the maximum absolute safe number of parallel-connected photovoltaic panels Z and the actual maximum safe number of parallel-connected photovoltaic panels Y includes:

[0015] When the number of parallel-connected photovoltaic panels in the photovoltaic module is less than the actual maximum safe number of parallel-connected photovoltaic panels, the increased number of photovoltaic panels is the difference between the number of parallel-connected photovoltaic panels in the photovoltaic module and Z;

[0016] When the number of parallel-connected photovoltaic panels in the photovoltaic module is greater than or equal to the actual maximum safe number of parallel-connected photovoltaic panels, the increased number of photovoltaic panels is the difference between the actual maximum safe number of parallel-connected photovoltaic panels and Z.

[0017] As an optional implementation manner of an embodiment of the present application, the method further includes: obtaining the output current of the photovoltaic module, and adjusting the number of operating photovoltaic panels according to the output current and the maximum charging current of the target device.

[0018] As an optional implementation manner of an embodiment of the present application, the adjusting the number of operating photovoltaic panels according to the output current and the maximum charging current of the target device includes:

[0019] When the number of parallel-connected photovoltaic panels in the photovoltaic module is greater than or equal to the actual maximum safe number of parallel-connected photovoltaic panels, if the output current is greater than the maximum charging current, then decrease the number of parallel-connected photovoltaic panels in the photovoltaic module until the output current is less than or equal to the maximum charging current;

[0020] If the output current is less than the maximum charging current, then add one operating photovoltaic panel as a regulated photovoltaic panel.

[0021] As an optional implementation manner of an embodiment of the present application, the method further includes:

[0022] Adjust the output power of the regulated photovoltaic panel so that the output current of the photovoltaic module approaches the maximum charging current.

[0023] As an optional implementation manner of an embodiment of the present application, the method further includes:

[0024] If the output current of the photovoltaic module is less than the maximum charging current when the regulated photovoltaic panel operates at the actual maximum output power, or the output current of the photovoltaic module is greater than the maximum charging current when the regulated photovoltaic panel is turned off, re-determine the actual maximum safe number of photovoltaic panels connected in parallel for the photovoltaic module.

[0025] As an optional implementation manner of an embodiment of the present application, when the estimated maximum output power is less than or equal to the maximum charging power of the target device, track the maximum output power of each photovoltaic panel in the photovoltaic module;

[0026] Operate each photovoltaic panel at the maximum output power corresponding to each photovoltaic panel.

[0027] As an optional implementation manner of an embodiment of the present application, the adjusting the number of operating photovoltaic panels according to the output current and the maximum charging current of the target device further includes:

[0028] When the number of photovoltaic panels connected in parallel in the photovoltaic module is less than the actual maximum safe number of photovoltaic panels connected in parallel, if the output current is greater than the maximum charging current of the target device, re-determine the actual maximum safe number of photovoltaic panels connected in parallel for the photovoltaic module.

[0029] In a second aspect, an embodiment of the present application provides a charging control device, including:

[0030] A determination module, configured to determine the estimated maximum output power of the photovoltaic module according to the number of photovoltaic panels connected in parallel in the photovoltaic module and the rated maximum output power of each photovoltaic panel, where the rated maximum output power of each photovoltaic panel is the same;

[0031] When the estimated maximum output power is greater than the maximum charging power of the target device, determine the maximum absolute safe number of photovoltaic panels connected in parallel Z for the photovoltaic module according to the rated maximum output power and the maximum charging power, where Z is the quotient of the maximum charging power divided by the rated maximum output power;

[0032] An operation module, configured to operate Z photovoltaic panels;

[0033] The determining module is further configured to: determine the actual maximum output power of each photovoltaic panel in the Z photovoltaic panels, and determine the actual maximum safe number of parallel-connected photovoltaic panels Y of the photovoltaic module according to the actual maximum output power of each photovoltaic panel in the Z photovoltaic panels and the maximum charging power;

[0034] The adjustment module is configured to increase the number of operating photovoltaic panels according to the maximum absolute safe number of parallel-connected photovoltaic panels Z and the actual maximum safe number of parallel-connected photovoltaic panels Y.

[0035] In a third aspect, an embodiment of the present application provides an electronic device, including: a memory and a processor, where the memory is used to store a computer program; the processor is configured to execute the method described in the first aspect or any implementation manner of the first aspect when calling the computer program.

[0036] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the method described in the first aspect or any implementation manner of the first aspect is implemented.

[0037] In a fifth aspect, an embodiment of the present application provides a computer program product, when the computer program product runs on the electronic device, the electronic device is enabled to execute the method described in any item of the first aspect.

[0038] The charging control solution provided by the embodiment of the present application first determines the estimated maximum output power of the photovoltaic module according to the number of parallel-connected photovoltaic panels in the photovoltaic module and the rated maximum output power of each photovoltaic panel. When the estimated maximum output power is greater than the maximum charging power of the target device, the maximum absolute safe number of parallel-connected photovoltaic panels Z of the photovoltaic module is determined according to the rated maximum output power and the maximum charging power; then Z photovoltaic panels are operated, and the actual maximum output power of each photovoltaic panel in the Z photovoltaic panels is determined, and the actual maximum safe number of parallel-connected photovoltaic panels Y of the photovoltaic module is determined according to the actual maximum output power of each photovoltaic panel in the Z photovoltaic panels and the maximum charging power; then the number of operating photovoltaic panels is increased according to the maximum absolute safe number of parallel-connected photovoltaic panels Z and the actual maximum safe number of parallel-connected photovoltaic panels Y, where the rated maximum output power of each photovoltaic panel is the same, and Z is the quotient of the maximum charging power divided by the rated maximum output power. In the above solution, first, according to the maximum absolute safe number of parallel-connected photovoltaic panels Z, Z photovoltaic panels are operated, so that the mobile energy storage device can be charged with as large a power as possible under absolute safety; then, according to the determined actual maximum safe number of parallel-connected photovoltaic panels of the photovoltaic module, the number of operating photovoltaic panels is increased, so that the charging power of the photovoltaic module can be adaptively increased under relative safety according to the actual operating conditions of the photovoltaic module, thereby reducing the occurrence of overcurrent while increasing the charging speed of the mobile energy storage device. Description of the Drawings

[0039] Figure 1 Schematic diagram of the connection relationship between a photovoltaic module and a mobile energy storage device provided by an embodiment of the present application;

[0040] Figure 2 Principle structure diagram of an MPPT device for controlling a photovoltaic panel;

[0041] Figure 3 Flow schematic diagram of a charging control method for a photovoltaic module provided by an embodiment of the present application;

[0042] Figure 4 Another flow schematic diagram of a charging control method for a photovoltaic module provided by an embodiment of the present application;

[0043] Figure 5 Flow schematic diagram of a method for adjusting the number of operating photovoltaic panels according to the output current and the maximum charging current of a target device provided by an embodiment of the present application;

[0044] Figure 6 Structure schematic diagram of a charging control device for a photovoltaic module provided by an embodiment of the present application;

[0045] Figure 7 Structure schematic diagram of an electronic device provided by an embodiment of the present application. Detailed implementation manners

[0046] With the development of solar photovoltaic technology, the combination of photovoltaic modules and mobile energy storage devices has been widely used in scenarios such as outdoors, remote areas, construction sites, and rescue sites without energy supply, because after the mobile energy storage device is used, the electricity of the mobile energy storage device can be supplemented by solar energy outdoors.

[0047] For example, the combination of an energy storage device + 2 * 400W photovoltaic panels can supplement 800W of electric energy for the energy storage device per hour at the maximum power. However, this charging speed is only the charging speed under ideal conditions. Usually, due to factors such as irradiation, weather, and equipment, the power of 800W per hour cannot be achieved. Moreover, even at the ideal charging speed, it is still slower compared to the charging speed of alternating current (for example, 1800W).

[0048] In addition, in some special usage scenarios, for example, when a user uses an additional battery paralleled energy storage device to use the energy storage device as an off-grid AC energy storage microgrid, the stored electricity may be very large (for example, there may be a large storage capacity of 6kWh in total). At this storage capacity, the time spent storing electric energy will be very long, and at this time, a faster photovoltaic charging speed is required for storage.

[0049] To address the above problems, usually, by connecting more photovoltaic panels in parallel to the photovoltaic module, the charging current of the photovoltaic module is increased to improve the charging speed of the mobile energy storage device.

[0050] Figure 1 The following is a schematic diagram of the connection relationship between the photovoltaic module and the mobile energy storage device provided by an embodiment of this application. As Figure 1 shown, 6 photovoltaic panels are connected in parallel in this photovoltaic module to charge the energy storage device, and each photovoltaic panel has a corresponding Maximum Power Point Tracking (MPPT) device.

[0051] Since the actual maximum power of each photovoltaic panel will change with the variation of sunlight conditions and so on, an MPPT device is required to continuously track the actual maximum power of the corresponding photovoltaic panels, enabling each photovoltaic panel to output at its actual maximum power.

[0052] Figure 2 The following is a schematic diagram of the principle structure for the MPPT device to control the photovoltaic panel. As Figure 2 shown, the photovoltaic panel and the load are connected through a DC / DC conversion circuit. The MPPT microcontroller unit (MCU) continuously detects the current or voltage change of the photovoltaic panel (i.e., global scanning), and adjusts the duty cycle of the Pulse Width Modulation (PWM) signal of the DC / DC converter according to the change. Since the photovoltaic panel and the DC / DC conversion circuit can be considered as linear circuits in a short period, as long as the equivalent resistance of the DC / DC conversion circuit is adjusted and made equal to the internal resistance of the photovoltaic panel all the time, the maximum output of the photovoltaic panel can be achieved, that is, the MPPT function of the photovoltaic panel is realized.

[0053] In Figure 1 the shown photovoltaic module, the theoretical maximum output power of each photovoltaic panel can be 400 W, (the voltage corresponding to the maximum power output can be 80 V, and the current can be 5 A), then the theoretical maximum output power after parallel connection can be 2400 W. Assume that the theoretical maximum charging power of the battery in the mobile energy storage device is 1500 W, the rated charging voltage is 60 V, and the rated charging current is 25 A. When the sunlight condition is perfect, the maximum output power of this photovoltaic module is much greater than the maximum charging power of the battery of the mobile energy storage device. Under the condition of constant voltage, it is manifested as the current output by the photovoltaic module is much greater than the rated safety current that the battery of the mobile energy storage device can withstand.

[0054] In addition, in a household photovoltaic power generation system or a large-scale photovoltaic power generation system, after the photovoltaic module performs photoelectric conversion, the electric energy obtained from the photoelectric conversion is stored in the energy storage battery, and there are also certain limitations on the charging power and charging current of the energy storage battery.

[0055] An excessive charging current can damage the battery of a mobile energy storage device. Moreover, when the charging current reaches a certain value, it is usually detected by the current detection system of the energy storage device and then disconnected for overcurrent protection, resulting in the interruption of charging.

[0056] To solve the problem of excessive charging current, the number of parallel-connected photovoltaic panels is usually reduced, directly making the ideal maximum output power of the parallel-connected photovoltaic panels lower than the rated safe charging power of the battery. However, perfect lighting conditions cannot be achieved most of the time, and this solution will reduce the charging speed of the mobile energy storage device. In view of this, the embodiments of the present application provide a charging control solution to reduce the occurrence of overcurrent while increasing the charging speed of the mobile energy storage device.

[0057] Figure 3 The flowchart of the charging control method for a photovoltaic module provided by an embodiment of the present application is shown as Figure 3 shown, and the method may include the following steps:

[0058] S110. Determine the estimated maximum output power of the photovoltaic module according to the number of parallel-connected photovoltaic panels in the photovoltaic module and the rated maximum output power of each photovoltaic panel.

[0059] The rated maximum output power of each photovoltaic panel in the photovoltaic module may be the same, and the rated maximum output power may be set according to the size, performance, etc. of the photovoltaic panel.

[0060] Specifically, after the photovoltaic module is powered on, it can automatically detect the number of parallel-connected photovoltaic panels in the photovoltaic module, and then determine the estimated maximum output power of the photovoltaic module according to the number of parallel-connected photovoltaic panels and the set rated maximum output power of the photovoltaic panel. For example, if it is detected that the number of parallel-connected photovoltaic panels in the photovoltaic module is 6 and the rated maximum output power of the photovoltaic panel is 400W, then the estimated maximum output power of the photovoltaic module is 6 * 400 = 2400W.

[0061] S120. When the estimated maximum output power is greater than the maximum charging power of the target device, determine the maximum absolute safe number Z of parallel-connected photovoltaic panels of the photovoltaic module according to the rated maximum output power and the maximum charging power.

[0062] The target device may be a mobile energy storage device. When the estimated maximum output power is greater than the maximum charging power of the target device, under the condition of constant voltage, it indicates that the current corresponding to the maximum output power of the photovoltaic module is greater than the maximum charging current of the target device. In this case, the maximum absolute safety number Z of photovoltaic panels in parallel of the photovoltaic module can be determined according to the rated maximum output power and the maximum charging power. Z can be the quotient of the maximum charging power divided by the rated maximum output power. For example, if the maximum charging power of the target device is 1500W and the rated maximum output power of each photovoltaic panel is 400W, then Z = 1500 / 400 = 3...300, that is, the maximum absolute safety number of photovoltaic panels in parallel of this photovoltaic module is 3.

[0063] S130. Operate Z photovoltaic panels, and determine the actual maximum output power of each of the Z photovoltaic panels. According to the actual maximum output power of each of the Z photovoltaic panels and the maximum charging power, determine the actual maximum safety number Y of photovoltaic panels in parallel of the photovoltaic module.

[0064] First, Z photovoltaic panels can be operated, and the actual maximum output power of each of the Z photovoltaic panels can be determined respectively according to the MPPT device of each of the Z photovoltaic panels, and then the Z photovoltaic panels can be further operated according to their respective actual maximum output powers.

[0065] Then, according to the actual maximum output power of each of the Z photovoltaic panels, the actual average maximum output power of the Z photovoltaic panels can be determined.

[0066] For example, if the actual maximum output powers of the Z photovoltaic panels are P max-1 、P max-2 、…P max-Z , then the actual average maximum output power P max-avg of the Z photovoltaic panels = (P max-1 + P max-2 + …P max-Z ) / Z.

[0067] Next, the quotient of the maximum charging power divided by the actual average maximum output power can be determined as the actual maximum safety number Y of photovoltaic panels in parallel in the photovoltaic module.

[0068] For example, if the maximum charging power P charging of the target device is 1500W and the actual average maximum output power P max-avg of the Z photovoltaic panels is 350W, 1500 / 350 = 4...100, then the actual maximum safety number Y of photovoltaic panels in parallel in the photovoltaic module is 4.

[0069] S140. According to the maximum absolute safety number Z of photovoltaic panels in parallel and the actual maximum safety number Y of photovoltaic panels in parallel, increase the number of operating photovoltaic panels.

[0070] When the number N of photovoltaic panels connected in parallel in a photovoltaic module is less than the actual maximum safe number Y of photovoltaic panels connected in parallel, the increased number of photovoltaic panels can be the difference between the number N of photovoltaic panels connected in parallel in the photovoltaic module and Z.

[0071] Specifically, while keeping the original Z photovoltaic panels operating at the maximum power, the remaining N - Z photovoltaic panels can be operated, and at the same time, the MPPT devices corresponding to these N - Z photovoltaic panels can be operated to track the actual maximum power of these N - Z photovoltaic panels and make these N - Z photovoltaic panels operate at their respective actual maximum powers.

[0072] When the number N of photovoltaic panels connected in parallel in a photovoltaic module is greater than or equal to the actual maximum safe number Y of photovoltaic panels connected in parallel, the increased number of photovoltaic panels can be the difference between the actual maximum safe number Y of photovoltaic panels connected in parallel and Z.

[0073] Specifically, if the number N of photovoltaic panels connected in parallel in a photovoltaic module is greater than or equal to the actual maximum safe number Y of photovoltaic panels connected in parallel, it means that if all the photovoltaic panels connected in parallel in the photovoltaic module operate at the maximum actual power, the maximum output power in the photovoltaic module will be greater than the maximum charging power of the target device. Therefore, while keeping the original Z photovoltaic panels operating at the maximum power, Y - Z photovoltaic panels can be further operated, and at the same time, the MPPT devices corresponding to these Y - Z photovoltaic panels can be operated to track the actual maximum power of these Y - Z photovoltaic panels and make these Y - Z photovoltaic panels operate at their respective actual maximum powers.

[0074] In addition, if the MPPT algorithm adopted by the MPPT device is a variable step - size type algorithm, then after the system reaches stability after operating for a period of time, it will lose the property of tracking the maximum power point. At this time, a timer can be added to perform a global scan again every set time so that each MPPT device can continuously track the maximum power point.

[0075] The charging control solution provided by the embodiment of the present application first determines the estimated maximum output power of the photovoltaic module according to the number of photovoltaic panels connected in parallel in the photovoltaic module and the rated maximum output power of each photovoltaic panel. When the estimated maximum output power is greater than the maximum charging power of the target device, the maximum absolute safety photovoltaic panel parallel number Z of the photovoltaic module is determined according to the rated maximum output power and the maximum charging power. Then, Z photovoltaic panels are operated, and the actual maximum output power of each of the Z photovoltaic panels is determined. According to the actual maximum output power of each of the Z photovoltaic panels and the maximum charging power, the actual maximum safety photovoltaic panel parallel number Y of the photovoltaic module is determined. Then, according to the maximum absolute safety photovoltaic panel parallel number Z and the actual maximum safety photovoltaic panel parallel number Y, the number of operating photovoltaic panels is increased. Among them, the rated maximum output power of each photovoltaic panel is the same, and Z is the quotient of the maximum charging power divided by the rated maximum output power. In the above solution, first, according to the maximum absolute safety photovoltaic panel parallel number Z, Z photovoltaic panels are operated, so that the mobile energy storage device can be charged with as large a power as possible under absolute safety. Then, according to the determined actual maximum safety photovoltaic panel parallel number of the photovoltaic module, the number of operating photovoltaic panels is increased, so that the charging power of the photovoltaic module can be adaptively increased under relative safety according to the actual operating conditions of the photovoltaic module, thereby reducing the occurrence of overcurrent while increasing the charging speed of the mobile energy storage device.

[0076] Figure 4 Another flowchart of the charging control method for a photovoltaic module provided by an embodiment of the present application is shown in Figure 4 As shown, the method may include the following steps:

[0077] S210. Determine the estimated maximum output power of the photovoltaic module according to the number of photovoltaic panels connected in parallel in the photovoltaic module and the rated maximum output power of each photovoltaic panel.

[0078] Step S210 may refer to the description of step S110 in the above Figure 3 shown embodiment and will not be elaborated here.

[0079] S220. When the estimated maximum output power is less than or equal to the maximum charging power of the target device, track the maximum output power of each photovoltaic panel in the photovoltaic module and operate each photovoltaic panel with the corresponding maximum output power of each photovoltaic panel.

[0080] Specifically, the master photovoltaic panel in the photovoltaic module can be started first. The master photovoltaic panel can be any photovoltaic panel in the photovoltaic module. For example, the No. 1 photovoltaic panel can be started first, and then according to the No. 1 MPPT device corresponding to the No. 1 photovoltaic panel, a global voltage scan is performed on the No. 1 photovoltaic panel to determine the maximum output power of the No. 1 photovoltaic panel and the voltage V pmax-1 corresponding to the maximum output power, and the No. 1 MPPT device is set as the master device.

[0081] The photovoltaic panels in a photovoltaic module are usually foldable and mobile photovoltaic charging panels. When users do not deliberately place the photovoltaic panels in the shadow against common sense, the average irradiance and other external factors received by each photovoltaic panel are relatively close, and the manufacturing processes of the photovoltaic panels in the module are also the same. Therefore, the voltage V corresponding to the maximum output power of the No. 1 photovoltaic panel can be used to pmax-1 narrow the scanning range of other photovoltaic panels.

[0082] Specifically, the scanning range of other photovoltaic panels can be narrowed according to the following formula (1):

[0083]

[0084] where Vrange n+1 represents the voltage scanning range of the (n + 1)-th photovoltaic panel, Upper limint represents the upper limit of the scanning voltage, Lowre limint represents the lower limit of the scanning voltage, and V pmax-n represents the voltage corresponding to the maximum output power of the n-th photovoltaic panel, and V max represents the maximum operating voltage of the photovoltaic panel, and C n-1 is a reduction coefficient. C can be a set fixed value, such as 0.9, or can be adjusted according to the local sunshine conditions. For example, it can be adjusted between 0.8 - 0.99 according to the local sunshine conditions.

[0085] It can be understood that during the actual scanning process, if the upper limit of the scanning voltage of the (n + 1)-th photovoltaic panel exceeds the rated voltage scanning upper limit of the n-th photovoltaic panel, the upper limit of the scanning voltage of the (n + 1)-th photovoltaic panel can be adjusted to the rated voltage scanning upper limit of the n-th photovoltaic panel, and the (n + 1)-th photovoltaic panel can be scanned according to the adjusted voltage scanning range.

[0086] After scanning each photovoltaic panel, the maximum output power of each obtained photovoltaic panel can be sent to the main control device, and the main control device can compare the maximum output power of other photovoltaic panels with the maximum output power of the main control photovoltaic panel respectively. If the absolute value of the difference between the maximum output power of a photovoltaic panel and the maximum output power of the main control photovoltaic panel divided by the maximum output power of the main control photovoltaic panel is greater than the target ratio, it means that the maximum output power tracking of this photovoltaic panel is abnormal, and then the global voltage scanning of this photovoltaic panel can be performed again.

[0087] The target ratio can be determined according to the maximum output power of the main control photovoltaic panel. For example, the target ratio can be 30% of the maximum output power of the main control photovoltaic panel.

[0088] The target ratio can also be adjusted according to the local weather change frequency. For example, it can be adjusted to smaller values such as 10%, 20%, etc. to increase the system accuracy; or it can be adjusted to larger values such as 35%, 40%, etc. to increase the system accuracy.

[0089] If the absolute value of the difference between the maximum output power of each other photovoltaic panel and the maximum output power of the main control photovoltaic panel and the ratio of the maximum output power of the main control photovoltaic panel are less than or equal to the target ratio, it indicates that the maximum output power tracking of each other photovoltaic panel is normal.

[0090] It can be understood that the maximum output power of each photovoltaic panel in the photovoltaic module can be determined every set time (for example, after 10 minutes) to update the maximum output power of each photovoltaic panel in real time.

[0091] S230. When the estimated maximum output power is greater than the maximum charging power of the target device, determine the maximum absolute safety photovoltaic panel parallel number Z of the photovoltaic module according to the rated maximum output power and the maximum charging power.

[0092] S240. Operate Z photovoltaic panels, and determine the actual maximum output power of each of the Z photovoltaic panels. According to the actual maximum output power of each of the Z photovoltaic panels and the maximum charging power, determine the actual maximum safety photovoltaic panel parallel number Y of the photovoltaic module.

[0093] S250. According to the maximum absolute safety photovoltaic panel parallel number Z and the actual maximum safety photovoltaic panel parallel number Y, increase the number of operating photovoltaic panels.

[0094] Steps S230 to S250 can refer to the descriptions of the corresponding steps S120 to S140 in the above Figure 3 illustrated embodiment, and will not be elaborated here.

[0095] S260. Obtain the output current of the photovoltaic module, and adjust the number of operating photovoltaic panels according to the output current and the maximum charging current of the target device.

[0096] Figure 5 The flowchart of the method for adjusting the number of operating photovoltaic panels according to the output current and the maximum charging current of the target device provided by an embodiment of the present application is as Figure 5 shown, and the method may include the following steps:

[0097] S261. When the number of photovoltaic panels connected in parallel in the photovoltaic module is greater than or equal to the actual maximum safety photovoltaic panel parallel number, if the output current is greater than the maximum charging current, decrease the number of photovoltaic panels connected in parallel in the photovoltaic module until the output current is less than or equal to the maximum charging current.

[0098] Specifically, when the number N of photovoltaic panels connected in parallel in a photovoltaic module is greater than or equal to the actual maximum safe number Y of parallel-connected photovoltaic panels, the photovoltaic module will first operate Y photovoltaic panels, and these Y photovoltaic panels all operate at their respective actual maximum power. At this time, if it is detected that the output current of the photovoltaic module is greater than the maximum charging current of the target device, it indicates that there may be differences in the specifications of the photovoltaic panels, or one or more of the Z photovoltaic panels are shaded when calculating the actual maximum output power, resulting in inaccurate calculation of the actual maximum output power. Therefore, the number of operating photovoltaic panels in the photovoltaic module can be decreased.

[0099] During the decreasing process, the output current of the photovoltaic module can be continuously detected. For each reduction of an operating photovoltaic panel, the output current of the photovoltaic module and the maximum charging current of the target device are compared again. If the output current of the photovoltaic module is greater than the maximum charging current of the target device, the reduction continues until the output current of the photovoltaic module is less than or equal to the maximum charging current of the target device.

[0100] When a certain operating photovoltaic panel is reduced and it is detected that the output current of the photovoltaic module is less than the maximum charging current of the target device, the output current of the photovoltaic module is already very close to the maximum charging current of the target device. To maximize the charging efficiency of the target device (i.e., the output current of the photovoltaic module is closer to the maximum charging current of the target device), an additional operating photovoltaic panel can be added as a regulated photovoltaic panel. At this time, in the photovoltaic module, except for the newly added regulated photovoltaic panel, the other photovoltaic panels all operate at the maximum power. The newly added regulated photovoltaic panel can be scanned, and the output current of the photovoltaic module can be continuously detected during the scanning process. Once it is detected that the output current is greater than the maximum charging current, the working voltage of the regulated photovoltaic panel can be adjusted to the previous scanning voltage of the current scanning voltage, making the output current of the photovoltaic module closer to the maximum charging current of the target device.

[0101] Furthermore, if the output current detected when the newly added regulated photovoltaic panel operates at the maximum power obtained by scanning is still less than the maximum charging current, it indicates that due to factors such as weather changes or shadows, the light conditions have suddenly weakened, and the actual maximum output power of each photovoltaic panel in the photovoltaic module has also suddenly decreased. More photovoltaic panels need to be operated to ensure the charging speed of the target device. Therefore, the newly operated Y - Z photovoltaic panels can be turned off, the actual maximum power of the remaining Z photovoltaic panels can be re - tracked, and the actual maximum safe number of parallel - connected photovoltaic panels of the photovoltaic module can be re - determined.

[0102] In addition, when the photovoltaic panel is turned off, if the detected output current is still greater than the maximum charging current, it indicates that due to factors such as weather changes, the illumination condition suddenly becomes stronger, and the actual maximum output power of each photovoltaic panel in the photovoltaic module also suddenly increases. In this case, the number of operating photovoltaic panels needs to be reduced. Therefore, the newly operating Y-Z block photovoltaic panels can be turned off, the actual maximum power of the remaining Z block photovoltaic panels can be retraced, and the actual maximum safe number of parallel-connected photovoltaic panels in the photovoltaic module can be re-determined.

[0103] S262. When the number of parallel-connected photovoltaic panels in the photovoltaic module is greater than or equal to the actual maximum safe number of parallel-connected photovoltaic panels, if the output current is less than the maximum charging current, add one operating photovoltaic panel as the regulated photovoltaic panel.

[0104] Specifically, when the number of parallel-connected photovoltaic panels in the photovoltaic module is greater than or equal to the actual maximum safe number of parallel-connected photovoltaic panels, if the output current is less than the maximum charging current, in order to maximize the charging efficiency of the target device (i.e., the output current of the photovoltaic module is closer to the maximum charging current of the target device), an additional operating photovoltaic panel can be added as the regulated photovoltaic panel. At this time, in the photovoltaic module, except for the newly added regulated photovoltaic panel, other photovoltaic panels operate at the maximum power. The newly added regulated photovoltaic panel can be scanned, and the output current of the photovoltaic module is continuously detected during the scanning process. Once it is detected that the output current is greater than the maximum charging current, the working voltage of the regulated photovoltaic panel can be adjusted to the previous scanning voltage of the current scanning voltage, so that the output current of the photovoltaic module is closer to the maximum charging current of the target device.

[0105] Furthermore, when the regulated photovoltaic panel is operating at the maximum power obtained by scanning and the detected output current is still less than the maximum charging current, it indicates that due to factors such as weather changes or shadows, the illumination condition suddenly becomes weaker, and the actual maximum output power of each photovoltaic panel in the photovoltaic module also suddenly decreases. More photovoltaic panels need to be operated to ensure the charging speed of the target device. Therefore, the newly operating Y-Z block photovoltaic panels can be turned off, the actual maximum power of the remaining Z block photovoltaic panels can be retraced, and the actual maximum safe number of parallel-connected photovoltaic panels in the photovoltaic module can be re-determined.

[0106] In addition, when the photovoltaic panel is turned off, if the detected output current is still greater than the maximum charging current, it indicates that due to factors such as weather changes, the illumination condition suddenly becomes stronger, and the actual maximum output power of each photovoltaic panel in the photovoltaic module also suddenly increases. In this case, the number of operating photovoltaic panels needs to be reduced. Therefore, the newly operating Y-Z block photovoltaic panels can be turned off, the actual maximum power of the remaining Z block photovoltaic panels can be retraced, and the actual maximum safe number of parallel-connected photovoltaic panels in the photovoltaic module can be re-determined.

[0107] S263. When the number of photovoltaic panels connected in parallel in a photovoltaic module is less than the actual maximum safe number of parallel-connected photovoltaic panels, if the output current is greater than the maximum charging current of the target device, re-determine the actual maximum safe number of parallel-connected photovoltaic panels in the photovoltaic module.

[0108] Specifically, when the number N of photovoltaic panels connected in parallel in a photovoltaic module is less than the actual maximum safe number Y of parallel-connected photovoltaic panels, the N photovoltaic panels in the photovoltaic module all operate at their respective actual maximum powers. At this time, if it is detected that the output current of the photovoltaic module is greater than the maximum charging current of the target device, it indicates that the illumination condition has suddenly become stronger, resulting in a sudden increase in the actual maximum output power of each photovoltaic panel in the photovoltaic module. Therefore, N - Z newly operating photovoltaic panels can be turned off, re-trace the actual maximum powers of the remaining Z photovoltaic panels, and re-determine the actual maximum safe number of parallel-connected photovoltaic panels in the photovoltaic module.

[0109] S264. When the number of photovoltaic panels connected in parallel in a photovoltaic module is less than the actual maximum safe number of parallel-connected photovoltaic panels, if the output current is less than or equal to the maximum charging current of the target device, keep the number of operating photovoltaic panels in the photovoltaic module unchanged.

[0110] Specifically, when the number N of photovoltaic panels connected in parallel in a photovoltaic module is less than the actual maximum safe number Y of parallel-connected photovoltaic panels, since all the photovoltaic panels in the photovoltaic module are already operating at their respective actual maximum powers at this time, even if it is detected that the output current of the photovoltaic module is less than or equal to the maximum charging current of the target device, it is already impossible to increase the charging speed of this photovoltaic module. At this time, this photovoltaic module can be kept operating at its maximum power.

[0111] Those skilled in the art can understand that the above embodiments are exemplary and are not used to limit the present application. Where possible, the execution order of one or several of the above steps can be adjusted, or they can be selectively combined to obtain one or more first embodiments. Those skilled in the art can arbitrarily select and combine from the above steps. All those that do not depart from the essence of the solution of the present application fall within the protection scope of the present application.

[0112] Based on the same inventive concept, as an implementation of the above method, an embodiment of the present application provides a charging control device. This device embodiment corresponds to the foregoing method embodiment. For the convenience of reading, the details of the foregoing method embodiment will not be repeated one by one in this device embodiment, but it should be clear that the device in this embodiment can correspondingly implement all the content of the foregoing method embodiment.

[0113] Figure 6 is a schematic structural diagram of the charging control device for the photovoltaic module provided by the embodiment of the present application, as Figure 6As shown in the figure, the charging control device provided in this embodiment may include: a determination module 11, an operation module 12, and an adjustment module 13, where:

[0114] The determination module 11 is configured to: determine the estimated maximum output power of the photovoltaic module according to the number of photovoltaic panels connected in parallel in the photovoltaic module and the rated maximum output power of each photovoltaic panel, where the rated maximum output power of each photovoltaic panel is the same;

[0115] When the estimated maximum output power is greater than the maximum charging power of the target device, determine the maximum absolute safe number of photovoltaic panels connected in parallel Z of the photovoltaic module according to the rated maximum output power and the maximum charging power, and Z is the quotient of the maximum charging power divided by the rated maximum output power;

[0116] The operation module 12 is configured to: operate Z photovoltaic panels;

[0117] The determination module 11 is further configured to: determine the actual maximum output power of each photovoltaic panel in the Z photovoltaic panels, and determine the actual maximum safe number of photovoltaic panels connected in parallel Y of the photovoltaic module according to the actual maximum output power of each photovoltaic panel in the Z photovoltaic panels and the maximum charging power;

[0118] The adjustment module 13 is configured to: increase the number of operating photovoltaic panels according to the maximum absolute safe number of photovoltaic panels connected in parallel Z and the actual maximum safe number of photovoltaic panels connected in parallel Y.

[0119] As an optional implementation manner, the determination module 11 is further configured to:

[0120] Determine the actual average maximum output power of the Z photovoltaic panels according to the actual maximum output power of each photovoltaic panel in the Z photovoltaic panels;

[0121] Determine the quotient of the maximum charging power divided by the actual average maximum output power as the actual maximum safe number of photovoltaic panels connected in parallel in the photovoltaic module.

[0122] As an optional implementation manner, when the number of photovoltaic panels connected in parallel in the photovoltaic module is less than the actual maximum safe number of photovoltaic panels connected in parallel, the increased number of photovoltaic panels is the difference between the number of photovoltaic panels connected in parallel in the photovoltaic module and Z;

[0123] When the number of photovoltaic panels connected in parallel in the photovoltaic module is greater than or equal to the actual maximum safe number of photovoltaic panels connected in parallel, the increased number of photovoltaic panels is the difference between the actual maximum safe number of photovoltaic panels connected in parallel and Z.

[0124] As an optional implementation manner, the device may further include:

[0125] Obtaining module 14: used to obtain the output current of the photovoltaic module;

[0126] The adjustment module 13 is further configured to: adjust the number of operating photovoltaic panels according to the output current obtained by the obtaining module 14 and the maximum charging current of the target device.

[0127] As an alternative implementation manner, the adjustment module 13 is specifically configured to: when the number of photovoltaic panels connected in parallel in the photovoltaic module is greater than or equal to the actual maximum safe number of photovoltaic panels connected in parallel, if the output current is greater than the maximum charging current, then decrease the number of photovoltaic panels connected in parallel in the photovoltaic module until the output current is less than or equal to the maximum charging current;

[0128] If the output current is less than the maximum charging current, then add one operating photovoltaic panel as a regulated photovoltaic panel.

[0129] As an alternative implementation manner, the adjustment module 13 is further configured to: adjust the output power of the regulated photovoltaic panel so that the output current of the photovoltaic module approaches the maximum charging current.

[0130] As an alternative implementation manner, the determination module 11 is further configured to: if the output current of the photovoltaic module is less than the maximum charging current when the regulated photovoltaic panel operates at the actual maximum output power, or if the output current of the photovoltaic module is greater than the maximum charging current when the regulated photovoltaic panel is turned off, then re-determine the actual maximum safe number of photovoltaic panels connected in parallel of the photovoltaic module.

[0131] As an alternative implementation manner, the determination module 11 is further configured to: when the estimated maximum output power is less than or equal to the maximum charging power of the target device, track the maximum output power of each photovoltaic panel in the photovoltaic module;

[0132] The operation module 12 is further configured to: operate each photovoltaic panel at the maximum output power corresponding to each photovoltaic panel.

[0133] As an alternative implementation manner, the determination module 11 is further configured to: when the number of photovoltaic panels connected in parallel in the photovoltaic module is less than the actual maximum safe number of photovoltaic panels connected in parallel, if the output current is greater than the maximum charging current of the target device, then re-determine the actual maximum safe number of photovoltaic panels connected in parallel of the photovoltaic module.

[0134] The charging control device of the photovoltaic module provided in this embodiment can execute the above method embodiment, and its implementation principle and technical effect are similar, which will not be elaborated here.

[0135] Those skilled in the art can clearly understand that, for the convenience and brevity of description, only the division of the above-mentioned functional units and modules is used as an example. In actual applications, the above-mentioned functions can be allocated to different functional units and modules according to needs, that is, the internal structure of the device is divided into different functional units or modules to complete all or part of the functions described above. Each functional unit and module in the embodiment can be integrated into a processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of a software functional unit. In addition, the specific names of the functional units and modules are only for the convenience of mutual distinction and do not limit the protection scope of this application. The specific working processes of the units and modules in the above-mentioned system can refer to the corresponding processes in the foregoing method embodiments and will not be elaborated herein.

[0136] Based on the same inventive concept, an embodiment of this application also provides an electronic device. Figure 7 The following is a schematic structural diagram of the electronic device provided by the embodiment of this application. As Figure 7 shown, the electronic device provided in this embodiment includes: a memory 210 and a processor 220. The memory 210 is used to store a computer program; the processor 220 is used to execute the method described in the foregoing method embodiment when calling the computer program.

[0137] The electronic device provided in this embodiment can execute the foregoing method embodiment, and its implementation principle and technical effects are similar and will not be elaborated herein.

[0138] An embodiment of this application also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the method described in the foregoing method embodiment is implemented.

[0139] An embodiment of this application also provides a computer program product. When the computer program product runs on an electronic device, the electronic device is caused to execute the method described in the foregoing method embodiment.

[0140] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present application are generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or a first programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted through the computer-readable storage medium. The computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by wire (such as coaxial cable, optical fiber, digital subscriber line) or wirelessly (such as infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server or a data center that includes one or more integrated available media. The available medium can be a magnetic medium (such as a floppy disk, hard disk, or magnetic tape), an optical medium (such as a DVD), or a semiconductor medium (such as a solid state disk (SSD)), etc.

[0141] Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be completed by computer programs instructing relevant hardware. The programs can be stored in a computer-readable storage medium. When the programs are executed, they can include the processes of the above method embodiments. The foregoing storage medium can include various media that can store program codes, such as ROM or random access memory RAM, magnetic disks, or optical discs.

[0142] In the present application, the naming or numbering of steps does not mean that the steps in the method process must be executed in the time / logical order indicated by the naming or numbering. The named or numbered process steps can be changed in the order of execution according to the technical purpose to be achieved, as long as the same or similar technical effects can be achieved.

[0143] In the above embodiments, the descriptions of each embodiment have their own emphases. For parts not detailed or recorded in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0144] In the embodiments provided in this application, it should be understood that the disclosed devices / apparatuses and methods can be implemented in other ways. For example, the device / apparatus embodiments described above are merely illustrative. For example, the division of the modules or units is only a logical function division. In actual implementation, there may be other division methods. For example, 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 displayed or discussed coupling or direct coupling or communication connection to each other can be through some interfaces. The indirect coupling or communication connection of the devices or units can be in electrical, mechanical or other forms.

[0145] It should be understood that when used in the specification and the appended claims of this application, the term "comprising" indicates the presence of the described features, wholes, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or their combinations.

[0146] In the description of this application, unless otherwise specified, " / " means that the objects associated before and after are in an "or" relationship. For example, A / B can represent A or B. The "and / or" in this application is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. These three situations, where A and B can be singular or plural.

[0147] Moreover, in the description of this application, unless otherwise specified, "a plurality of" means two or more than two. "At least one of the following" or its similar expressions refer to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b, or c can represent: a, b, c, a - b, a - c, b - c, or a - b - c, where a, b, c can be single or multiple.

[0148] As used in the specification and the appended claims of this application, the term "if" can be interpreted as "when", "once", "in response to determining", or "in response to detecting" according to the context. Similarly, the phrase "if determined" or "if [the described condition or event] is detected" can be interpreted as meaning "once determined", "in response to determining", "once [the described condition or event] is detected", or "in response to detecting [the described condition or event]" according to the context.

[0149] In addition, in the description of the specification and the appended claims of the present application, the terms "first", "second", "third", etc. are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments described here can be implemented in an order other than that illustrated or described here.

[0150] Reference to "an embodiment" or "some embodiments" etc. described in the specification of the present application means that a specific feature, structure or characteristic described in connection with the embodiment is included in one or more embodiments of the present application. Thus, statements such as "in an embodiment", "in some embodiments", "in the first some embodiments", "in other some embodiments", etc. that appear in different places in this specification do not necessarily all refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in a first manner.

[0151] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A charging control method, characterized in that, Including: Determine the estimated maximum output power of the photovoltaic module according to the number of photovoltaic panels connected in parallel in the photovoltaic module and the rated maximum output power of each of the photovoltaic panels, wherein the rated maximum output power of each of the photovoltaic panels is the same; When the estimated maximum output power is greater than the maximum charging power of the target device, determine the maximum absolute safe number of photovoltaic panels connected in parallel Z of the photovoltaic module according to the rated maximum output power and the maximum charging power, and Z is the quotient of the maximum charging power divided by the rated maximum output power; Operate Z photovoltaic panels, and determine the actual maximum output power of each of the Z photovoltaic panels. Determine the actual maximum safe number of photovoltaic panels connected in parallel Y of the photovoltaic module according to the actual maximum output power of each of the Z photovoltaic panels and the maximum charging power; Obtain the comparison result between the number of photovoltaic panels connected in parallel in the photovoltaic module and the actual maximum safe number of photovoltaic panels connected in parallel Y. According to the comparison result, the number of photovoltaic panels connected in parallel in the photovoltaic module, the maximum absolute safe number of photovoltaic panels connected in parallel Z, and the actual maximum safe number of photovoltaic panels connected in parallel Y, increase the number of operating photovoltaic panels.

2. The method according to claim 1, wherein The determining the actual maximum safe number of photovoltaic panels connected in parallel Y of the photovoltaic module according to the actual maximum output power of each of the Z photovoltaic panels and the maximum charging power includes: Determine the actual average maximum output power of the Z photovoltaic panels according to the actual maximum output power of each of the Z photovoltaic panels; Determine the quotient of the maximum charging power divided by the actual average maximum output power as the actual maximum safe number of photovoltaic panels connected in parallel Y in the photovoltaic module.

3. The method according to claim 1, wherein The increasing the number of operating photovoltaic panels according to the comparison result, the number of photovoltaic panels connected in parallel in the photovoltaic module, the maximum absolute safe number of photovoltaic panels connected in parallel Z, and the actual maximum safe number of photovoltaic panels connected in parallel Y includes: When the number of photovoltaic panels connected in parallel in the photovoltaic module is less than the actual maximum safe number of photovoltaic panels connected in parallel Y, the increased number of photovoltaic panels is the difference between the number of photovoltaic panels connected in parallel in the photovoltaic module and Z; When the number of photovoltaic panels connected in parallel in the photovoltaic module is greater than or equal to the actual maximum safe number of photovoltaic panels connected in parallel Y, the increased number of photovoltaic panels is the difference between the actual maximum safe number of photovoltaic panels connected in parallel Y and Z.

4. The method according to claim 1, wherein The method further includes: Obtain the output current of the photovoltaic module, and adjust the number of operating photovoltaic panels according to the output current and the maximum charging current of the target device.

5. The method according to claim 4, characterized in that, The adjusting the number of operating photovoltaic panels according to the output current and the maximum charging current of the target device includes: When the number of photovoltaic panels connected in parallel in the photovoltaic module is greater than or equal to the actual maximum safe number of photovoltaic panels connected in parallel Y, if the output current is greater than the maximum charging current, then decrease the number of photovoltaic panels connected in parallel in the photovoltaic module until the output current is less than or equal to the maximum charging current; If the output current is less than the maximum charging current, then add one operating photovoltaic panel as the regulated photovoltaic panel.

6. The method according to claim 5, characterized in that, The method further includes: Adjust the output power of the regulated photovoltaic panel so that the output current of the photovoltaic module is close to the maximum charging current.

7. The method according to claim 6, wherein The method further includes: If the output current of the photovoltaic module is less than the maximum charging current when the regulated photovoltaic panel operates at the actual maximum output power, or if the output current of the photovoltaic module is greater than the maximum charging current when the regulated photovoltaic panel is turned off, then re-determine the actual maximum safe number Y of photovoltaic panels connected in parallel in the photovoltaic module.

8. The method according to claim 1, wherein When the estimated maximum output power is less than or equal to the maximum charging power of the target device, track the maximum output power of each photovoltaic panel in the photovoltaic module; Operate each of the photovoltaic panels at the maximum output power corresponding to each of the photovoltaic panels.

9. The method according to any one of claims 4 to 7, characterized in that, After adjusting the number of operating photovoltaic panels according to the output current and the maximum charging current of the target device, it further includes: When the number of photovoltaic panels connected in parallel in the photovoltaic module is less than the actual maximum safe number Y of photovoltaic panels connected in parallel, if the output current is greater than the maximum charging current of the target device, then re-determine the actual maximum safe number Y of photovoltaic panels connected in parallel in the photovoltaic module.

10. A charging control device, characterized in that, It includes: A determination module, configured to determine the estimated maximum output power of the photovoltaic module according to the number of photovoltaic panels connected in parallel in the photovoltaic module and the rated maximum output power of each of the photovoltaic panels, wherein the rated maximum output power of each of the photovoltaic panels is the same; When the estimated maximum output power is greater than the maximum charging power of the target device, determine the maximum absolute safe number Z of photovoltaic panels connected in parallel in the photovoltaic module according to the rated maximum output power and the maximum charging power, and Z is the quotient of the maximum charging power divided by the rated maximum output power; An operation module, configured to operate Z photovoltaic panels; The determination module is further configured to: determine the actual maximum output power of each of the Z photovoltaic panels, and determine the actual maximum safe number Y of photovoltaic panels connected in parallel in the photovoltaic module according to the actual maximum output power of each of the Z photovoltaic panels and the maximum charging power; An adjustment module, configured to obtain the comparison result between the number of photovoltaic panels connected in parallel in the photovoltaic module and the actual maximum safe number Y of photovoltaic panels connected in parallel, and increase the number of operating photovoltaic panels according to the comparison result, the number of photovoltaic panels connected in parallel in the photovoltaic module, the maximum absolute safe number Z of photovoltaic panels connected in parallel, and the actual maximum safe number Y of photovoltaic panels connected in parallel.

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