Solar charging system, utilization rate improving method thereof and medium

Abstract

The invention relates to a solar charging system, a utilization rate improving method thereof and a medium, and the method comprises the steps: configuring an initial charging current for each battery assembly, and entering an operation mode; the operation mode executes the following operations: changing the charging current in a manner that the initial charging current gradually increases, meanwhile, the output power changes along with the change of the charging current, and when the maximum power value is detected, calculating a corresponding drop threshold value based on the maximum power value, after the charging current corresponding to the drop threshold value is set as the charging current in the monitoring mode, entering the monitoring mode; the monitoring mode executes the following operations: when the output power is less than the power stability lower limit, changing the charging current in a current decreasing mode and then entering the operation mode, and when the duration of the output power not less than the power stability lower limit is greater than a time threshold, changing the charging current in a current increasing mode and then entering the operation mode; and entering an operation mode. According to the invention, the hardware cost is saved, and the solar efficiency is greatly improved.

Description

Technical Field

[0001] The present invention relates to the field of solar charging, and in particular to a solar charging system and a method and medium for improving utilization thereof. Background Art

[0002] The existing method to improve the utilization rate of solar energy is generally to use the MPPT maximum power point detection function, but the system using MPPT is very complex and requires complex hardware circuits and software algorithms. There are many kinds of MPPT algorithms, and it is relatively difficult to select a suitable MPPT algorithm and adjust the algorithm parameters. If the algorithm is not suitable or the parameter debugging is not appropriate, the stability of the solar energy system will be greatly affected, and the solar energy utilization efficiency may be lower, which may even seriously affect the stability of the solar panels. Summary of the invention

[0003] In order to solve the above problems, the present invention proposes a solar charging system and a method and medium for improving its utilization rate.

[0004] The specific plan is as follows:

[0005] A method for improving the utilization rate of a solar charging system comprises the following steps:

[0006] Before charging each battery component in the solar charging system, an initial charging current is configured for each battery component, and after the configuration is completed, the operation mode is entered;

[0007] The operation mode performs the following operations: starting from the initial charging current, the current change direction is gradually changed in an increasing manner to change the charging current of each battery component, and at the same time, the output power of the solar charging panel changes with the charging current. When the maximum power value is detected, the corresponding drop threshold is calculated based on the maximum power value, and the charging current corresponding to the drop threshold is set as the charging current in the monitoring mode, and then the monitoring mode is entered;

[0008] The monitoring mode performs the following operations: after charging each battery component with the charging current in the monitoring mode, the output power of the solar charging panel is detected in real time, and it is determined whether the output power is less than the power stability lower limit. If so, the operation mode is entered, and the operation mode is changed to take the charging current in the monitoring mode as the starting point, and the current change direction is gradually changed in a decreasing manner to change the charging current of each battery component; when the output power is not less than the power stability lower limit, when the duration of the output power not less than the power stability lower limit is greater than the time threshold, the operation mode is entered, and the operation mode is changed to take the charging current in the monitoring mode as the starting point, and the current change direction is gradually changed in an increasing manner to change the charging current of each battery component.

[0009] Furthermore, when changing the charging current of each battery assembly, it is increased or decreased in a fixed step.

[0010] Further, when the corresponding decreasing threshold is calculated based on the maximum power value, the decreasing threshold is the maximum power value*95%.

[0011] Furthermore, when a battery assembly or a solar charging panel is plugged in or out in the solar charging system, the charging current in the currently recorded monitoring mode is cleared, and the system returns to the state before charging each battery assembly in the solar charging system and executes each step again.

[0012] A solar charging system includes a solar charging panel, a battery assembly, a power detection device, a processor, a memory, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the method described above in the embodiment of the present invention are implemented.

[0013] A computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the method described above in an embodiment of the present invention are implemented.

[0014] The present invention adopts the above technical solution, which can make the load power of the battery assembly always at the maximum peak point, maximize the solar output power, and at the same time ensure that the solar input power is always at the highest peak point, greatly improving the solar efficiency. The present invention does not require the use of complex hardware circuits and complex MPPT algorithms. For users who do not need to pursue the ultimate solar efficiency, it saves hardware costs, complex algorithm selection and debugging time costs, and also reduces the use stability risk of complex algorithms. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Shown is a flow chart of a method according to a first embodiment of the present invention. DETAILED DESCRIPTION

[0016] To further illustrate various embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention, which are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, ordinary technicians in this field should be able to understand other possible implementations and advantages of the present invention.

[0017] The present invention will now be further described with reference to the accompanying drawings and specific implementation methods.

[0018] Embodiment 1:

[0019] The embodiment of the present invention provides a method for improving the utilization rate of a solar charging system. Figure 1As shown, the method comprises the following steps:

[0020] S1: Before charging each battery module in the solar charging system, an initial charging current is configured for each battery module. After the configuration is completed, the operation mode is entered.

[0021] In this embodiment, the initial charging current is set to 0.

[0022] S2: The operation mode performs the following operations: starting from the initial charging current, the current change direction is gradually changed in an increasing manner to change the charging current of each battery component, and at the same time, the output power of the solar charging panel is detected as the charging current changes. When the maximum power value is detected, the corresponding drop threshold is calculated based on the maximum power value, and the charging current corresponding to the drop threshold is set to the charging current in the monitoring mode, and then the monitoring mode is entered.

[0023] In this embodiment, when changing the charging current of each battery assembly, it is increased or decreased in a fixed step. The step sizes used for increasing and decreasing are different. Since the speed required for decreasing is faster, a larger step is required at a time.

[0024] By detecting the change of the output power of the solar charging panel with the charging current, a curve of the change of the output power with the charging current can be drawn, and the peak point in the curve is the maximum power value.

[0025] The drop threshold value set in this embodiment is a point near the maximum power value, which is calculated by the maximum power value * 95%. In other embodiments, those skilled in the art can set the size of the drop threshold value according to actual needs. It should be noted that during each operation of the model, the maximum power value changes and needs to be re-searched, but the calculation method of the drop threshold value is fixed.

[0026] S3: The monitoring mode performs the following operations: after charging each battery component with the charging current in the monitoring mode, the output power of the solar charging panel is detected in real time, and it is determined whether the output power is less than the power stability lower limit. If so, the operation mode is entered, and the operation mode is changed to take the charging current in the monitoring mode as the starting point, and the current change direction is gradually changed in a decreasing manner to change the charging current of each battery component; when the output power is not less than the power stability lower limit, when the duration of the output power not less than the power stability lower limit is greater than the time threshold, the operation mode is entered, and the operation mode is changed to take the charging current in the monitoring mode as the starting point, and the current change direction is gradually changed in an increasing manner to change the charging current of each battery component.

[0027] The lower limit of power stability can be determined according to the output power in the monitoring mode. It is generally believed that when the charging current is fixed, its corresponding output power should also fluctuate within a fixed range. For example, when the charging current is the charging current in the monitoring mode, its output power fluctuates above and below the decreasing threshold of the charging current (such as 3%), then the decreasing threshold * (1-3%) can be set as the lower limit of power stability corresponding to the charging current.

[0028] When the power is lower than the lower limit of power stability, it can be considered that the solar energy input is insufficient (such as from noon to afternoon). At this time, the maximum power value that the solar charging panel can provide is lower than before. If the previously obtained charging current is continued, it is not appropriate. Therefore, it is necessary to re-enter the operation mode to find a new maximum power value, and then obtain a new charging current under the monitoring mode. When re-entering the operation mode, starting from the charging current under the current monitoring mode, the current change direction is gradually changed in a decreasing manner to change the charging current of each battery component, re-draw the output power versus charging current curve, and re-find a new maximum power value, so that the charging current after re-entering the monitoring mode fits the current solar energy input.

[0029] When the duration of the output power not being less than the power stability lower limit is greater than the time threshold, there may be an increase in solar energy input (such as from morning to noon). Since the increase in solar energy input will not cause a change in the output power of the solar charging panel, in order to be able to timely identify this state and update the charging current to better utilize solar energy, the present embodiment also re-enters the operation mode at this time, taking the charging current in the current monitoring mode as the starting point, the current change direction is gradually changed in an increasing manner to change the charging current of each battery component, the output power versus charging current curve is redrawn, and the new maximum power value is re-searched, so that the charging current after re-entering the monitoring mode fits the current solar energy input.

[0030] In the above method, the operation mode is entered multiple times, and the starting point is the initial charging current only when the operation mode is entered for the first time. The starting point for the other times is the charging current in the current monitoring mode. The direction of the current change when entering the monitoring mode is determined according to the judgment conditions in the monitoring mode. When the operation mode is entered with the output power less than the power stability lower limit, the maximum power value at this time should be smaller than the maximum power value obtained last time, so a decreasing method is used; when the operation mode is entered with the output power not less than the power stability lower limit and the duration is greater than the time threshold, the maximum power value at this time should be larger than the maximum power value obtained last time, so an increasing method is used.

[0031] When the system of this embodiment is working normally, it is in a process of constantly switching between the operation mode and the monitoring mode, and the charging current is in a dynamic adjustment process, ensuring that the solar energy input power is always near the power peak point, greatly improving the utilization rate of solar energy.

[0032] Furthermore, when a battery module or a solar charging panel is plugged in or out in the solar charging system, the charging current of each battery module should be updated. Therefore, it is necessary to clear the charging current currently recorded in the monitoring mode and return to the state before charging each battery module in the solar charging system to re-execute each step, that is, enter the operation mode starting from the initial charging current.

[0033] Embodiment 2:

[0034] The present invention also provides a solar charging system, comprising a solar charging panel, a battery assembly, a power detection device, a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps in the above-mentioned method embodiment of the first embodiment of the present invention when executing the computer program.

[0035] The present invention also provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the above method in the embodiment of the present invention are implemented.

[0036] If the module / unit integrated in the terminal device for improving the utilization rate of the solar charging system is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present invention implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method embodiments when executed by the processor. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device that can carry the computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory) and software distribution medium, etc.

[0037] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, it should be understood by those skilled in the art that various changes may be made to the present invention in form and details without departing from the spirit and scope of the present invention as defined by the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. A method for improving the utilization rate of a solar charging system, characterized in that: The following steps are involved: Before charging each battery component in the solar charging system, an initial charging current is configured for each battery component, and after the configuration is completed, the operation mode is entered; The operation mode performs the following operations: starting from the initial charging current, the current change direction is gradually changed in an increasing manner to change the charging current of each battery component, and at the same time, the output power of the solar charging panel changes with the charging current. When the maximum power value is detected, the corresponding drop threshold is calculated based on the maximum power value, and the charging current corresponding to the drop threshold is set as the charging current in the monitoring mode, and then the monitoring mode is entered; The monitoring mode performs the following operations: after charging each battery component with the charging current in the monitoring mode, the output power of the solar charging panel is detected in real time, and it is determined whether the output power is less than the power stability lower limit. If so, the operation mode is entered, and the operation mode is changed to take the charging current in the monitoring mode as the starting point, and the current change direction is gradually changed in a decreasing manner to change the charging current of each battery component; when the output power is not less than the power stability lower limit, when the duration of the output power not less than the power stability lower limit is greater than the time threshold, the operation mode is entered, and the operation mode is changed to take the charging current in the monitoring mode as the starting point, and the current change direction is gradually changed in an increasing manner to change the charging current of each battery component.

2. The method for improving the utilization rate of a solar charging system according to claim 1, characterized in that: When changing the charging current of each battery assembly, it is increased or decreased in fixed steps.

3. The method for improving the utilization rate of a solar charging system according to claim 1, characterized in that: When the corresponding decreasing threshold is calculated based on the maximum power value, the decreasing threshold is the maximum power value*95%.

4. The method for improving the utilization rate of a solar charging system according to claim 1, characterized in that: When a battery assembly or a solar charging panel is plugged in or out of the solar charging system, the charging current in the monitoring mode currently recorded is cleared, and the system returns to the state before charging each battery assembly in the solar charging system and executes each step again.

5. A solar charging system, characterized in that: The method comprises a solar charging panel, a battery assembly, a power detection device, a processor, a memory, and a computer program stored in the memory and running on the processor. When the processor executes the computer program, the steps of the method as claimed in any one of claims 1 to 4 are implemented.

6. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 4 are implemented.

Images