Linkage control method and system of optical storage system and charging pile, medium and product

Abstract

The invention discloses a linkage control method and system for a light storage system and a charging pile, a medium and a product, and relates to the technical field of charging. The light storage system comprises a photovoltaic subsystem and a battery subsystem, and the photovoltaic subsystem and the battery subsystem are both connected with the charging pile and used for supplying power to the charging pile. The linkage control method for the optical storage system and the charging pile comprises the step of performing linkage control on the optical storage system and the charging pile according to the required charging amount and the charge state value of the battery subsystem. According to the method, the influence of photovoltaic power fluctuation of the photovoltaic subsystem can be avoided, linkage control is carried out on the optical storage system and the charging pile connected to the optical storage system through the required charging amount and the charge state value of the battery subsystem, unnecessary electric quantity loss of the optical storage system can be reduced, and economic benefits are improved.

Description

Technical Field

[0001] This application relates to the field of charging technology, and in particular to a method, system, medium, and product for the linkage control of a photovoltaic energy storage system and a charging pile. Background Technology

[0002] Photovoltaic and energy storage systems and charging stations, as power generation and consumption devices respectively, are often two independent systems controlled independently. This means that the photovoltaic and energy storage system often cannot provide adequate power to the charging station, potentially causing unnecessary power loss.

[0003] Application content

[0004] This application aims to at least partially address one of the technical problems in the related art. Therefore, the purpose of this application is to propose a method, system, medium, and product for the coordinated control of a photovoltaic energy storage system and a charging pile, so as to achieve coordinated control between the photovoltaic energy storage system and the charging pile, thereby helping to reduce the power loss of the photovoltaic energy storage system and increase its economic benefits.

[0005] In a first aspect, embodiments of this application propose a method for the coordinated control of a photovoltaic energy storage system and a charging pile. The photovoltaic energy storage system includes a photovoltaic subsystem and a battery subsystem, both of which are connected to the charging pile to supply power to it. The method includes: performing coordinated control of the photovoltaic energy storage system and the charging pile based on the required charging amount and the state of charge value of the battery subsystem.

[0006] According to one embodiment of this application, the step of linking the photovoltaic energy storage system and the charging pile based on the required charging amount and the state of charge value of the battery subsystem includes: if the required charging amount is less than a preset charging amount threshold, controlling the photovoltaic energy storage system to activate the backup power linkage control mode, and controlling the charging pile according to the state of charge value; if the required charging amount is greater than or equal to the preset charging amount threshold, controlling the photovoltaic energy storage system to activate the discharge cutoff linkage control mode, and controlling the charging pile according to the state of charge value.

[0007] When controlling the photovoltaic energy storage system to activate the backup power linkage control mode, controlling the charging pile based on the state of charge (SBC) value includes: if the SBC value is less than a first SBC threshold, determining that the photovoltaic energy storage system is in the charging stop zone of the backup power linkage control mode, and issuing a first charging stop command to the charging pile so that the charging pile charges the device to be charged with a first charging current; if the SBC value is greater than or equal to the first SBC threshold but less than a second SBC threshold, determining that the photovoltaic energy storage system is in the transition zone of the backup power linkage control mode, and issuing a first charging maintenance command to the charging pile so that the charging pile charges the device to be charged with a second charging current, wherein the second charging current is greater than the first charging current; if the SBC value is greater than or equal to the second SBC threshold, determining that the photovoltaic energy storage system is in the charging start zone of the backup power linkage control mode, and issuing a first charging start command to the charging pile so that the charging pile charges the device to be charged with a third charging current, wherein the third charging current is greater than the second charging current.

[0008] According to one embodiment of this application, when controlling the photovoltaic energy storage system to activate the discharge cutoff linkage control mode, the step of controlling the charging pile based on the state of charge value includes: if the state of charge value is less than a third state of charge threshold, then determining that the photovoltaic energy storage system is in the charging stop zone of the discharge cutoff linkage control mode, and issuing a second charging stop command to the charging pile so that the charging pile charges the device to be charged with a fourth charging current; if the state of charge value is greater than or equal to the third state of charge threshold and less than the fourth state of charge threshold, then determining that the photovoltaic energy storage system is in the discharge cutoff linkage control mode over... The system enters a charging start zone under discharge cutoff linkage control mode. A second charging maintenance command is issued to the charging pile to charge the device with a fifth charging current, wherein the fifth charging current is greater than the fourth charging current. If the state of charge value is greater than or equal to the fourth state of charge threshold, the system is determined to be in a charging start zone under discharge cutoff linkage control mode. A second charging start command is issued to the charging pile to charge the device with a sixth charging current, wherein the sixth charging current is greater than the fifth charging current, and the fourth state of charge threshold is less than the first state of charge threshold.

[0009] According to one embodiment of this application, the first charging current is less than or equal to the minimum allowable charging current of the charging pile, the third charging current is less than or equal to the maximum allowable charging current of the charging pile, and the maximum charging current corresponding to the second charging current exhibits a step-like variation and is positively correlated with the state of charge value.

[0010] According to one embodiment of this application, the fourth charging current is less than or equal to the minimum allowable charging current of the charging pile, the sixth charging current is less than or equal to the maximum allowable charging current of the charging pile, and the maximum charging current corresponding to the fifth charging current exhibits a step-like variation and is positively correlated with the state of charge value.

[0011] According to one embodiment of this application, after controlling the photovoltaic energy storage system to enable the backup power linkage control mode, the method further includes: if a linkage control switching command is received, controlling the photovoltaic energy storage system to switch to the discharge cut-off linkage control mode.

[0012] Secondly, embodiments of this application provide a computer-readable storage medium having a computer program stored thereon, wherein when the computer program is executed by a processor, it implements the method described in the first aspect embodiment.

[0013] Thirdly, embodiments of this application provide a computer program product for performing the methods described in the first aspect embodiments above.

[0014] Fourthly, this application proposes a linkage control system for a photovoltaic energy storage system and a charging pile, comprising: a photovoltaic energy storage system, a charging pile, and a controller; wherein, the photovoltaic energy storage system includes a photovoltaic subsystem and a battery subsystem, both of which are connected to the charging pile for supplying power to the charging pile; the controller is used to perform linkage control on the photovoltaic energy storage system and the charging pile according to the required charging amount and the state of charge value of the battery subsystem.

[0015] The linkage control method, system, medium, and product of the photovoltaic energy storage system and charging pile in this application embodiment can be unaffected by the photovoltaic power fluctuation of the photovoltaic subsystem. By using the demand for charging and the state of charge value of the battery subsystem, the linkage control of the photovoltaic energy storage system and the charging pile connected to the photovoltaic energy storage system can be carried out, which helps to reduce unnecessary power loss of the photovoltaic energy storage system and improve economic efficiency. Attached Figure Description

[0016] Figure 1 This is a flowchart of the linkage control method between the photovoltaic energy storage system and the charging pile according to an embodiment of this application;

[0017] Figure 2 This is a connection diagram of a photovoltaic energy storage system and a charging pile according to an embodiment of this application;

[0018] Figure 3 This is a flowchart of step S11 of one embodiment of this application;

[0019] Figure 4(a) is a flowchart of controlling a charging pile based on a state of charge value according to an embodiment of this application;

[0020] Figure 4(b) is a flowchart of a linkage control method between a photovoltaic energy storage system and a charging pile according to an embodiment of this application;

[0021] Figure 5(a) is a schematic diagram of energy storage partitions with different control strategies according to an embodiment of this application;

[0022] Figure 5(b) is a schematic diagram comparing the charging current of different energy storage zones in one embodiment of this application;

[0023] Figure 6 This is a flowchart of another embodiment of the present application for controlling a charging pile based on a state of charge value;

[0024] Figure 7 This is a structural block diagram of a controller according to an embodiment of this application;

[0025] Figure 8 This is a structural block diagram of the linkage control system between the photovoltaic energy storage system and the charging pile in an embodiment of this application. Detailed Implementation

[0026] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0027] The following description, with reference to the accompanying drawings, describes the linkage control method, system, medium, and product of the photovoltaic energy storage system and charging pile according to embodiments of this application.

[0028] Figure 1 This is a flowchart illustrating the linkage control method between the photovoltaic energy storage system and the charging pile according to an embodiment of this application. This control method can be executed by a controller (such as a microcontroller chip), which can be integrated into the photovoltaic energy storage system.

[0029] In this embodiment, such as Figure 2 As shown, the photovoltaic-storage system 200 includes a photovoltaic subsystem 210 and a battery subsystem 220. Both the photovoltaic subsystem 210 and the battery subsystem 220 are connected to the charging pile 300 to supply power to the charging pile 300. That is, the charging pile 300 can draw power from the photovoltaic subsystem 210 or the battery subsystem 220 to charge the device to be charged (such as an electric vehicle EV). The photovoltaic-storage system 100 and the charging pile 300 can also be connected to the power grid 400. The photovoltaic-storage system 100 can also supply electrical energy to the power grid 400, and the charging pile 300 can also draw power from the power grid 400.

[0030] The photovoltaic subsystem 210 may include photovoltaic power generation modules and an inverter, while the battery subsystem 220 may include an energy storage battery and an inverter. In one implementation, the photovoltaic subsystem 210 and the battery subsystem 220 may share the same inverter. The inverter can convert the DC power generated by the photovoltaic power generation modules or the DC power output from the energy storage battery into AC power to supply the charging pile 300 and / or the power grid 400. It can also perform DC-DC voltage conversion on the DC power generated by the photovoltaic power generation modules to charge the energy storage battery.

[0031] See Figure 1 The linkage control methods between the photovoltaic energy storage system and the charging pile include:

[0032] S11 performs coordinated control of the photovoltaic energy storage system and the charging pile based on the required charging amount and the state of charge value of the battery subsystem.

[0033] The required charging amount can be the charging demand of the device connected to the charging pile, which can be obtained through the charging pile. Taking an electric vehicle as an example, when an electric vehicle arrives at a charging station, it connects to the charging pile and submits a charging request. The required charging amount can be obtained by the charging pile based on this request and sent to the controller. The state of charge (SOC) value of the battery subsystem can be obtained by looking up a table. For example, if the energy storage battery in the battery subsystem is charging, its voltage in the charging state can be obtained, and the voltage-SOC value table for the charging state can be consulted to obtain the corresponding SOC value. Similarly, if the energy storage battery in the battery subsystem is discharging, its voltage in the discharging state can be obtained, and the voltage-SOC value table for the discharging state can be consulted to obtain the corresponding SOC value.

[0034] Specifically, after obtaining the required charging amount and the state of charge (SOC) value of the battery subsystem, the photovoltaic-storage system and charging piles can be linked and controlled based on these parameters. The entire process is unaffected by fluctuations in the photovoltaic power of the photovoltaic subsystem. By linking the charging pile's charging demand with the battery subsystem's own SOC, the photovoltaic-storage system and the charging piles connected to it can be controlled in a coordinated manner, helping to reduce unnecessary power loss in the photovoltaic-storage system and improve economic efficiency.

[0035] In some embodiments of this application, such as Figure 3 As shown, based on the required charging amount and the state of charge (SOC) value of the battery subsystem, the photovoltaic-energy storage system and the charging pile are linked for control, including:

[0036] S31, determine the range of the required charging amount.

[0037] S32, if the required charging amount is less than the preset charging amount threshold, the photovoltaic energy storage system is controlled to start the backup power linkage control mode, and the charging pile is controlled according to the state of charge value.

[0038] S33, if the required charging amount is greater than or equal to the preset charging amount threshold, the photovoltaic energy storage system is controlled to start the discharge cutoff linkage control mode, and the charging pile is controlled according to the state of charge value.

[0039] The preset charging threshold can be set according to actual needs. In the backup power linkage control mode, the photovoltaic subsystem can be controlled to charge the battery subsystem. When the battery subsystem reaches the preset backup power SoC (i.e., the SoC threshold at which the battery subsystem exits energy storage, denoted as SoC_r), the photovoltaic subsystem stops charging the battery subsystem. In the discharge cutoff linkage control mode, the battery subsystem can be controlled to discharge to supply power to the charging pile. When the battery subsystem reaches the preset discharge cutoff SoC (i.e., the SoC threshold at which the battery subsystem stops discharging, denoted as SoC_o), the battery subsystem stops discharging.

[0040] It should be noted that when the backup power linkage control mode is activated, if the state of charge (SOC) value of the battery subsystem is greater than or equal to SoC_r, the photovoltaic subsystem may not be controlled to charge the battery subsystem. Similarly, when the discharge cutoff linkage control mode is activated, if the SOC value of the battery subsystem is less than or equal to SoC_o, the battery subsystem may not be controlled to discharge.

[0041] Specifically, if the required charging amount is less than a preset charging threshold, it indicates that the charging device's demand for the charging pile is relatively low. In this case, priority can be given to ensuring the state of charge (SOC) value of the battery subsystem, as a precaution. For example, when the SOC value of the battery subsystem is less than SoC_r, the photovoltaic subsystem can be controlled to charge the battery subsystem to ensure that the SOC value of the battery subsystem reaches SoC_r. Simultaneously, the charging pile can be controlled based on the SOC value of the battery subsystem, determining whether the photovoltaic subsystem, the battery subsystem, or both should supply power to the charging pile. By prioritizing the photovoltaic subsystem and / or the battery subsystem to supply power to the charging pile, the need for the charging pile to draw power from the grid can be reduced or avoided, increasing the economic benefits of the photovoltaic-storage system.

[0042] If the required charging amount is greater than or equal to the preset charging threshold, it indicates that the device to be charged has a large demand for charging from the charging pile. In this case, the photovoltaic subsystem alone may not be able to meet the charging pile's charging needs. Therefore, it is considered to discharge the battery subsystem to meet the charging pile's charging needs. Specifically, the charging pile can be controlled based on the state of charge value of the battery subsystem. When the photovoltaic subsystem's power supply to the charging pile is insufficient, priority should be given to powering the charging pile from the battery subsystem. This can reduce or avoid the charging pile drawing power from the grid, increasing the economic benefits of the photovoltaic-storage system.

[0043] In some embodiments of this application, as shown in FIG4(a), when controlling the photovoltaic energy storage system to activate the backup power linkage control mode, the charging pile is controlled according to the state of charge value, including:

[0044] S41, determine the charging zone in the backup power linkage control mode of the photovoltaic energy storage system based on the state of charge value.

[0045] S42, if the state of charge value is less than the first state of charge threshold, then the photovoltaic energy storage system is determined to be in the charging stop zone under the backup power linkage control mode, and a first charging stop command is issued to the charging pile so that the charging pile charges the device to be charged with the first charging current.

[0046] S43, if the state of charge value is greater than or equal to the first state of charge threshold and less than the second state of charge threshold, then the photovoltaic-storage system is determined to be in the transition zone of the backup power linkage control mode, and a first charging maintenance command is issued to the charging pile so that the charging pile charges the device to be charged with the second charging current.

[0047] The second charging current is greater than the first charging current.

[0048] S44. If the state of charge value is greater than or equal to the second state of charge threshold, the photovoltaic-storage system is determined to be in the charging start zone under the backup power linkage control mode, and the first charging start command is issued to the charging pile so that the charging pile charges the device to be charged with the third charging current.

[0049] The third charging current is greater than the second charging current.

[0050] Specifically, the first charging current can be less than or equal to the minimum allowable charging current of the charging pile, the third charging current can be less than or equal to the maximum allowable charging current of the charging pile, and the maximum charging current corresponding to the second charging current can vary in a step-like manner and is positively correlated with the state of charge (SOC) value. The first SOC threshold can be denoted as SoC_r + Δ3, and the second SOC threshold can be denoted as SoC_r + Δ4, where Δ3 and Δ4 represent the increment of the backup power SOC when the first charging stop command is issued to the charging pile and the increment of the backup power SOC when the first charging start command is issued to the charging pile, respectively, and Δ3 < Δ4. Their values ​​can be determined according to the user's needs and the characteristics of the power change of the battery subsystem itself.

[0051] As shown in Table 1, Figure 5(a), and Figure 5(b), when the photovoltaic-storage system activates the backup power linkage control mode, it indicates that the target charging demand is small. At this time, the charging zone of the photovoltaic-storage system under the backup power linkage control mode can be determined according to the range of the state of charge value. Then, based on the charging zone, the following three control methods are used for the charging piles:

[0052] The first scenario: If the state of charge (SOC) value is less than SoC_r + Δ3, it indicates that the battery subsystem has relatively low power. Since the backup power requirement of the battery subsystem must be met first (i.e., the SOC value must be greater than SoC_r), the amount of power available to the charging pile is limited, approximately (SOC value - SoC_r). Therefore, a charging stop zone can be set in the backup power linkage control mode of the photovoltaic-storage system. The controller can issue a first charging stop command to the charging pile, allowing it to charge the device with a smaller initial charging current. Specifically, the maximum charging current of the charging pile can be controlled to be less than or equal to the minimum allowable charging current I_min. This allows the charging pile to still be powered by the battery subsystem during charging, thus meeting the charging needs of the photovoltaic-storage system while simultaneously addressing the backup power requirements of the battery subsystem, and reducing or avoiding power draw from the grid.

[0053] The second scenario: A state of charge (SOC) value greater than or equal to SoC_r + Δ3 and less than SoC_r + Δ4 indicates that the battery subsystem can supply at least Δ3 units of power to the charging pile while meeting backup power requirements. The photovoltaic-storage system can be set to a transition zone in the backup power linkage control mode. The controller can issue a first charging maintenance command to the charging pile, enabling it to charge the device with a second charging current. Specifically, the maximum charging current of the charging pile can be controlled to change in a stepped manner, positively correlated with the SOC value. That is, the higher the SOC value of the battery subsystem, the higher the maximum charging current of the charging pile, resulting in a faster charging speed. The number of stepped changes in the transition zone is denoted as n1, which can be determined based on user needs and the power variation characteristics of the battery subsystem itself. Figure 5(b) shows an example with n1 = 4. Therefore, while increasing the charging speed through the photovoltaic-storage system, the backup power requirements of the battery subsystem can be met, and drawing power from the grid can be reduced or avoided.

[0054] The third scenario: A state of charge (SOC) value greater than or equal to SoC_r + Δ4 indicates that the battery subsystem, while meeting backup power requirements, can supply at least Δ4 units of charge to the charging pile. The photovoltaic-storage system can be set to the charging initiation zone under backup power linkage control mode. The controller can issue a first charging initiation command to the charging pile, enabling it to charge the device with a larger third charging current. Specifically, the maximum charging current of the charging pile can be controlled to be the maximum allowable charging current I_max, achieving fast charging. Thus, while meeting short-term charging needs through the photovoltaic-storage system, the backup power requirements of the battery subsystem can also be considered, reducing or avoiding power extraction from the grid.

[0055] Table 1

[0056]

[0057]

[0058] In this embodiment, as shown in FIG4(b), after controlling the charging pile to stop charging the device to be charged, the method further includes:

[0059] S12, if a linkage control switching command is received, the control of the photovoltaic energy storage system is switched from the backup power activation linkage control mode to the discharge cut-off linkage control mode.

[0060] The linkage control switching command can be triggered by whether a charging stop command is issued to the charging pile. For example, in the backup power linkage control mode, if the controller issues a charging stop command to the charging pile, it can be determined that the linkage control switching command has been received, as illustrated in Figure 4(b). The linkage control switching command can also be manually triggered by the user. For example, in the backup power linkage control mode, if the controller detects a user-input linkage control switching command, it can be determined that the linkage control switching command has been received. Multiple triggering methods improve control flexibility and better meet user needs.

[0061] Specifically, when controlling the photovoltaic energy storage system to activate the backup power linkage control mode, if a linkage control switching command is received, the photovoltaic energy storage system can be controlled to switch from the backup power activation linkage control mode to the discharge cut-off linkage control mode to increase the charging current of the charging pile, meet the short-term charging needs of the equipment to be charged, or better realize the charging pile to draw power from the photovoltaic energy storage system to increase the economic benefits of the photovoltaic energy storage system.

[0062] It should be noted that in the backup power linkage control mode, the state of charge (SOC) of the battery subsystem must meet the backup power requirements, meaning the battery subsystem's charge level must be greater than or equal to SoC_r. In contrast, in the discharge cutoff linkage control mode, the SOC of the battery subsystem must be greater than or equal to SoC_o. Since SoC_r is greater than SoC_o, switching the photovoltaic-storage system from the backup power linkage control mode to the discharge cutoff linkage control mode can effectively meet the charging needs of the charging piles while also balancing the economic benefits of the photovoltaic-storage system. The reverse is not true (the battery subsystem must be charged first, at which point the photovoltaic-storage system will inevitably be unable to meet the charging needs of the charging piles, requiring the charging piles to draw large amounts of power from the grid, resulting in low or even no economic benefits for the photovoltaic-storage system).

[0063] In some embodiments of this application, such as Figure 6 As shown, when the photovoltaic-energy storage system activates the discharge cutoff linkage control mode, the charging pile is controlled according to the state of charge value, including:

[0064] S61, determine the charging zone of the photovoltaic energy storage system under the discharge cutoff linkage control mode based on the state of charge value.

[0065] S62, if the state of charge value is less than the third state of charge threshold, then the photovoltaic energy storage system is determined to be in the charging stop zone under the discharge cutoff linkage control mode, and a second charging stop command is issued to the charging pile so that the charging pile charges the device to be charged with the fourth charging current.

[0066] S63, if the state of charge value is greater than or equal to the third state of charge threshold and less than the fourth state of charge threshold, then the photovoltaic energy storage system is determined to be in the transition zone of the discharge cutoff linkage control mode, and a second charging maintenance command is issued to the charging pile so that the charging pile charges the device to be charged with the fifth charging current.

[0067] The fifth charging current is greater than the fourth charging current.

[0068] S64, if the state of charge value is greater than or equal to the fourth state of charge threshold, then the photovoltaic energy storage system is determined to be in the charging start zone under the discharge cutoff linkage control mode, and a second charging start command is issued to the charging pile so that the charging pile charges the device to be charged with the sixth charging current.

[0069] Among them, the sixth charging current is greater than the fifth charging current, and the fourth state of charge threshold is less than the first state of charge threshold.

[0070] Specifically, the fourth charging current can be less than or equal to the minimum allowable charging current of the charging pile, the sixth charging current can be less than or equal to the maximum allowable charging current of the charging pile, and the maximum charging current corresponding to the fifth charging current can vary in a step-like manner and is positively correlated with the state of charge (SOC) value. The third SOC threshold can be denoted as SoC_r + Δ1, and the second SOC threshold can be denoted as SoC_r + Δ2, where Δ1 and Δ2 represent the increment of the discharge cutoff SOC when the second charging stop command is issued to the charging pile and the increment of the discharge cutoff SOC when the second charging start command is issued to the charging pile, respectively, and Δ1 < Δ2. Their values ​​can be determined according to the user's needs and the characteristics of the power change of the battery subsystem itself.

[0071] As shown in Table 1, Figure 5(a), and Figure 5(b), when the photovoltaic-energy storage system activates the discharge cutoff linkage control mode, it indicates a large target charging demand. At this time, the charging zone under the discharge cutoff linkage control mode of the photovoltaic-energy storage system can be determined based on the range of the state of charge value. Then, based on the charging zone, the following three control methods can be used for the charging piles:

[0072] The first scenario: If the state of charge (SOC) value is less than SoC_o + Δ1, it indicates that the battery subsystem has a relatively low capacity. Since the battery subsystem's discharge cutoff requirement must be met first (i.e., the SOC value must be greater than SoC_o), the available capacity for the charging pile is limited, approximately (SOC value - SoC_o). Therefore, a charging stop zone can be set in the discharge cutoff linkage control mode of the photovoltaic-storage system. The controller can then issue a second charging stop command to the charging pile, allowing it to charge the device with a smaller fourth charging current. Specifically, the maximum charging current of the charging pile can be controlled to be the minimum allowable charging current I_min. This allows the charging pile to still be powered by the battery subsystem during charging, thus meeting the charging needs of the photovoltaic-storage system while simultaneously satisfying the discharge cutoff requirement of the battery subsystem, and reducing or eliminating the need to draw power from the grid.

[0073] The second scenario: a state of charge (SOC) value greater than or equal to SoC_o + Δ1 and less than SoC_o + Δ2 indicates that the battery subsystem, while meeting the discharge cutoff requirement, can supply at least Δ1 units of charge to the charging pile. The photovoltaic-storage system can be set to a transition zone within the discharge cutoff linkage control mode. The controller can issue a second charging sustaining command to the charging pile, enabling it to charge the device with a fifth charging current. Specifically, the maximum charging current of the charging pile can be controlled to change in a stepped manner, positively correlated with the SOC value. That is, the higher the SOC value of the battery subsystem, the higher the maximum charging current of the charging pile, resulting in a faster charging speed. The number of stepped changes in the transition zone is denoted as n2, which can be determined based on user needs and the power variation characteristics of the battery subsystem itself. Figure 5(b) shows an example with n2 = 4. Therefore, while increasing the charging speed through the photovoltaic-storage system, the discharge cutoff requirement of the battery subsystem can be met, and drawing power from the grid can be reduced or avoided.

[0074] The third scenario: A state of charge (SOC) value greater than or equal to SoC_o + Δ2 indicates that the battery subsystem, while meeting the discharge cutoff requirement, can supply at least Δ2 units of charge to the charging pile. The photovoltaic-storage system can be set to the charging initiation zone under discharge cutoff linkage control mode. The controller can then issue a second charging initiation command to the charging pile, enabling it to charge the device with a larger sixth charging current. Specifically, the maximum charging current of the charging pile can be controlled to be the maximum allowable charging current I_max, achieving rapid charging. Thus, while meeting short-term charging needs through the photovoltaic-storage system, the discharge cutoff requirement of the battery subsystem can be met, and drawing power from the grid can be reduced or avoided.

[0075] In some embodiments of this application, the linkage control method between the photovoltaic energy storage system and the charging pile can be executed once every certain period of time (e.g., 5 minutes, 10 minutes, etc.) to adapt to the actual state of the photovoltaic energy storage system and the charging pile.

[0076] In summary, the linkage control method between the photovoltaic energy storage system and the charging pile in this application determines whether the photovoltaic energy storage system is operating in a backup power linkage control mode or a discharge cutoff linkage control mode based on the target charging demand. Under different linkage control modes, the charging pile connected to the photovoltaic energy storage system is controlled according to the SoC value of the battery subsystem, thereby realizing the linkage between the photovoltaic energy storage system and the charging pile. It can maximize the use of the photovoltaic energy storage system to supply power to the charging pile, thereby reducing or avoiding the charging pile drawing power from the grid, reducing the power loss of the photovoltaic energy storage system, and increasing the economic benefits of the photovoltaic energy storage system.

[0077] Based on the linkage control method of the photovoltaic energy storage system and charging pile in the above embodiments, this application proposes a computer-readable storage medium.

[0078] In this embodiment, a computer program is stored on a computer-readable storage medium. When the computer program is executed by a processor, it implements the linkage control method between the photovoltaic energy storage system and the charging pile described in the above embodiment.

[0079] Based on the linkage control method of the photovoltaic energy storage system and charging pile in the above embodiments, this application also proposes a computer program product.

[0080] In this embodiment, the computer program product is used to execute the linkage control method between the photovoltaic energy storage system and the charging pile described in the above embodiment.

[0081] In some embodiments of this application, the computer program product may be the controller described above. For example... Figure 7 As shown, the controller 700 includes a processor 701 and a memory 703. The processor 701 and the memory 703 are connected, for example, via a bus 702. Optionally, the controller 700 may also include a transceiver 704. It should be noted that in practical applications, the transceiver 704 is not limited to one type, and the structure of the controller 700 does not constitute a limitation on the embodiments of this application.

[0082] Processor 701 may be a CPU (Central Processing Unit), a general-purpose processor, a DSP (Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. It can implement or execute the various exemplary logic blocks, modules, and circuits described in conjunction with the disclosure of this application. Processor 701 may also be a combination that implements computational functions, such as including one or more microprocessor combinations, a combination of a DSP and a microprocessor, etc.

[0083] Bus 702 may include a pathway for transmitting information between the aforementioned components. Bus 702 may be a PCI (Peripheral Component Interconnect) bus or an EISA (Extended Industry Standard Architecture) bus, etc. Bus 702 can be divided into address bus, data bus, control bus, etc. For ease of representation, Figure 7 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0084] The memory 703 stores a computer program corresponding to the linkage control method between the photovoltaic energy storage system and the charging pile in the above embodiments of this application. This computer program is controlled and executed by the processor 701. The processor 701 executes the computer program stored in the memory 703 to implement the content shown in the aforementioned method embodiments.

[0085] The controller 700 includes, but is not limited to, fixed terminals such as digital TVs and desktop computers. Figure 7 The controller 700 shown is merely an example and should not impose any limitation on the functionality and scope of use of the embodiments of this application.

[0086] Figure 8 This is a structural block diagram of the linkage control system between the photovoltaic energy storage system and the charging pile in an embodiment of this application.

[0087] like Figure 8 As shown, the linkage control system 800 between the photovoltaic energy storage system and the charging pile includes: the photovoltaic energy storage system 200, the charging pile 300, and the controller 700 described in the above embodiment.

[0088] The photovoltaic-storage system 200 includes a photovoltaic subsystem 210 and a battery subsystem 220, both of which are connected to the charging pile 300 to supply power to the charging pile 300. The controller 700 is used to perform coordinated control of the photovoltaic-storage system 200 and the charging pile 300 based on the required charging amount and the state of charge value of the battery subsystem.

[0089] It should be noted that logical steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: electrical connections having one or more wires (electronic devices), portable computer disk drives (magnetic devices), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0090] It should be understood that various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0091] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0092] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0093] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0094] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0095] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0096] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A method for the coordinated control of a photovoltaic energy storage system and a charging pile, characterized in that, The photovoltaic-storage system includes a photovoltaic subsystem and a battery subsystem, both of which are connected to the charging pile to supply power to the charging pile. The method includes: Based on the required charging amount and the state of charge value of the battery subsystem, the photovoltaic energy storage system and the charging pile are controlled in a coordinated manner.

2. The method of claim 1, wherein, The step of linking and controlling the photovoltaic energy storage system and the charging pile based on the required charging amount and the state of charge value of the battery subsystem includes: If the required charging amount is less than the preset charging amount threshold, the photovoltaic energy storage system is controlled to activate the backup power linkage control mode, and the charging pile is controlled according to the state of charge value. If the required charging amount is greater than or equal to the preset charging amount threshold, the photovoltaic energy storage system is controlled to activate the discharge cutoff linkage control mode, and the charging pile is controlled according to the state of charge value.

3. The method of claim 2, wherein, When controlling the photovoltaic-storage system to activate the backup power linkage control mode, controlling the charging pile based on the state of charge value includes: If the state of charge value is less than the first state of charge threshold, the photovoltaic energy storage system is determined to be in the charging stop zone under the backup power linkage control mode, and a first charging stop command is issued to the charging pile so that the charging pile charges the device to be charged with the first charging current. If the state of charge value is greater than or equal to the first state of charge threshold and less than the second state of charge threshold, then the photovoltaic energy storage system is determined to be in the transition zone of the backup power linkage control mode, and a first charging maintenance command is issued to the charging pile so that the charging pile charges the device to be charged with a second charging current, wherein the second charging current is greater than the first charging current. If the state of charge value is greater than or equal to the second state of charge threshold, the photovoltaic-storage system is determined to be in the charging start zone of the backup power linkage control mode, and a first charging start command is issued to the charging pile so that the charging pile charges the device to be charged with a third charging current, wherein the third charging current is greater than the second charging current.

4. The method of claim 2, wherein, When controlling the photovoltaic energy storage system to activate the discharge cutoff linkage control mode, controlling the charging pile based on the state of charge value includes: If the state of charge value is less than the third state of charge threshold, the photovoltaic energy storage system is determined to be in the charging stop zone under the discharge cutoff linkage control mode, and a second charging stop command is issued to the charging pile so that the charging pile charges the device to be charged with a fourth charging current. If the state of charge value is greater than or equal to the third state of charge threshold and less than the fourth state of charge threshold, then the photovoltaic energy storage system is determined to be in the transition zone of the discharge cutoff linkage control mode, and a second charging maintenance command is issued to the charging pile so that the charging pile charges the device to be charged with a fifth charging current, wherein the fifth charging current is greater than the fourth charging current. If the state of charge value is greater than or equal to the fourth state of charge threshold, the photovoltaic energy storage system is determined to be in the charging start zone of the discharge cutoff linkage control mode, and a second charging start command is issued to the charging pile so that the charging pile charges the device to be charged with a sixth charging current, wherein the sixth charging current is greater than the fifth charging current, and the fourth state of charge threshold is less than the first state of charge threshold.

5. The method of claim 3, wherein, The first charging current is less than or equal to the minimum allowable charging current of the charging pile, the third charging current is less than or equal to the maximum allowable charging current of the charging pile, the maximum charging current corresponding to the second charging current changes in a step shape and is positively correlated with the state of charge value.

6. The method of claim 4, wherein, The fourth charging current is less than or equal to the minimum allowable charging current of the charging pile, the sixth charging current is less than or equal to the maximum allowable charging current of the charging pile, and the maximum charging current corresponding to the fifth charging current changes in a step-like manner and is positively correlated with the state of charge value.

7. The method of claim 3, wherein, After controlling the photovoltaic energy storage system to activate the backup power linkage control mode, the method further includes: If a linkage control switching command is received, the photovoltaic energy storage system is controlled to switch to the start-discharge cut-off linkage control mode.

8. A computer-readable storage medium having stored thereon a computer program, characterized in that, When the computer program is executed by a processor, it implements the method according to any one of claims 1-7.

9. A computer program product, characterised in that, Used to perform the method according to any one of claims 1-7.

10. A linkage control system for a photovoltaic energy storage system and a charging pile, characterized in that, include: Photovoltaic and energy storage systems, charging piles, and controllers; among them, The photovoltaic and energy storage system includes a photovoltaic subsystem and a battery subsystem. Both the photovoltaic subsystem and the battery subsystem are connected to the charging pile to supply power to the charging pile. The controller is used to perform coordinated control of the photovoltaic energy storage system and the charging pile based on the required charging amount and the state of charge value of the battery subsystem.

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