Charging and discharging power allocation method, apparatus and device for energy storage device, and storage medium

Abstract

The present application relates to a charging and discharging power allocation method, apparatus and device for an energy storage device, and a storage medium. The method comprises: obtaining the total charging and discharging power allocated to battery clusters in an energy storage device; and allocating the total charging and discharging power with the objectives of optimizing the charging and discharging efficiency of the battery clusters of the energy storage device and balancing the cycle counts of the battery clusters, to obtain sub charging and discharging power allocated to the battery clusters. The method further comprises: on the basis of the sub charging and discharging power allocated to the battery clusters, controlling the battery clusters to charge or discharge. Thus, in the embodiments of the present application, when the battery clusters charge and discharge on the basis of the allocated sub charging and discharging power, the charging and discharging efficiency of the battery clusters can be optimized and the cycle counts of the battery clusters can be balanced, helping to prolong the operational life of the energy storage system while achieving the overall efficiency-optimized operation of the energy storage system.

Description

Method, device, equipment and storage medium for distributing charging and discharging power of energy storage equipment

[0001] Cross-references

[0002] This application refers to Chinese Patent Application No. 2024102243124, filed on February 29, 2024, entitled “Charging and discharging power distribution method, device, equipment and storage medium for energy storage equipment”, which is incorporated into this application in its entirety by reference. Technical Field

[0003] The present application relates to the field of energy storage technology, and in particular to a method, apparatus, device, and storage medium for distributing charging and discharging power of an energy storage device. Background Art

[0004] With the development of new energy technologies, energy storage devices for renewable energy power generation are becoming increasingly widespread. Energy storage devices consist of multiple battery clusters, and the charge and discharge balance of these clusters significantly impacts the normal operation of the energy storage device. Therefore, managing the charge and discharge balance of multiple battery clusters is an important research topic.

[0005] In the related art, the state of charge (SOC) balance management of the battery cluster is achieved based on the SOC of each battery cluster. However, the related art has the problem of uneven service life of different battery clusters.

[0006] Summary of the Invention

[0007] In view of the above problems, the present application provides a method, apparatus, device and storage medium for distributing charging and discharging power of an energy storage device, which can solve the problem of uneven service life of different battery clusters in the related art.

[0008] In a first aspect, the present application provides a method for allocating charge and discharge power for an energy storage device, the method comprising: obtaining a total charge and discharge power allocated to each battery cluster in the energy storage device; allocating the total charge and discharge power with the optimal charge and discharge efficiency of each battery cluster of the energy storage device and a balanced number of cycles of each battery cluster as allocation goals to obtain a sub-charge and discharge power allocated to each battery cluster; and controlling the charging and discharging of each battery cluster according to the sub-charge and discharge power allocated to each battery cluster.

[0009] In the technical solution of the embodiment of the present application, the total charge and discharge power is distributed by taking the optimal charge and discharge efficiency of each battery cluster of the energy storage device and the balanced number of cycles of each battery cluster as the distribution goals to obtain the sub-charge and discharge power allocated to each battery cluster. When each battery cluster is charged and discharged according to the allocated sub-charge and discharge power, the charge and discharge efficiency of each battery cluster can be optimized and the number of cycles of each battery cluster can be balanced. This is conducive to achieving the optimal overall efficiency operation of the energy storage system while also improving the operating life of the energy storage system.

[0010] In some embodiments, the total charge and discharge power is allocated with the optimal charge and discharge efficiency of each battery cluster of the energy storage device and the balanced number of cycles of each battery cluster as allocation targets to obtain the sub-charge and discharge power allocated to each battery cluster, including: dividing each battery cluster into at least one battery cluster group according to the SOC of each battery cluster; wherein different battery cluster groups have different charge and discharge priorities; determining at least one target battery cluster group that needs to be charged and discharged, and the target charge and discharge power corresponding to each target battery cluster group from at least one battery cluster group according to the total charge and discharge power and the charge and discharge power limit corresponding to each battery cluster group; for each target battery cluster group, with the optimal charge and discharge efficiency of each battery cluster in the target battery cluster group and the balanced number of cycles of each battery cluster as allocation targets, the target charge and discharge power corresponding to the target battery cluster group is allocated to obtain the sub-charge and discharge power allocated to each battery cluster in the target battery cluster group.

[0011] In the technical solution of the embodiment of the present application, at least one target battery cluster group that needs to be charged and discharged, and the target charge and discharge power corresponding to each target battery cluster group are determined based on the SOC of each battery cluster, the total charge and discharge power, and the charge and discharge power limit corresponding to each battery cluster group. The target charge and discharge power corresponding to each target battery cluster group is allocated with the optimal charge and discharge efficiency of each battery cluster in each target battery cluster group and the balanced number of cycles of each battery cluster as the allocation target, so as to obtain the sub-charge and discharge power allocated to each battery cluster in each target battery cluster group. This facilitates the battery clusters in each target battery cluster group that needs to be charged and discharged to be charged and discharged according to the allocated sub-charge and discharge power, which can not only optimize the charge and discharge efficiency of each battery cluster of the energy storage device and balance the number of cycles of each battery cluster, but also help to improve the power allocation efficiency.

[0012] In some embodiments, the target charge and discharge power corresponding to the target battery cluster group is allocated with the optimal charge and discharge efficiency of each battery cluster in the target battery cluster group and the balanced number of cycles of each battery cluster as the allocation target to obtain the sub-charge and discharge power allocated to each battery cluster in the target battery cluster group, including: obtaining an objective function, wherein the objective function includes the imbalance part and the charge and discharge power loss part of the historical charge and discharge capacity of each battery cluster in the target battery cluster group; based on preset constraints, solving the objective function with the minimum value of the objective function as the target to obtain the sub-charge and discharge power allocated to each battery cluster in the target battery cluster group.

[0013] In the technical solution of the embodiment of the present application, the objective function is solved based on preset constraints with the goal of minimizing the value of the objective function including the imbalance part and the charge and discharge power loss part, so as to obtain the sub-charge and discharge power allocated to each battery cluster in the target battery cluster group. This can further optimize the charge and discharge efficiency of each battery cluster and balance the number of cycles of each battery cluster, thereby further facilitating the overall optimal operation of the energy storage system while also improving the operating life of the energy storage system.

[0014] In some embodiments, obtaining the imbalance portion of the historical charge and discharge capacity of each battery cluster in the target battery cluster group includes: obtaining the imbalance of the historical charge and discharge capacity of each battery cluster in the target battery cluster group based on the historical total charge and discharge capacity and the corresponding sub-charge and discharge power of each battery cluster in the target battery cluster group; obtaining the imbalance portion based on the energy storage system cost corresponding to the unit charge and discharge capacity and the imbalance of the historical charge and discharge capacity of each battery cluster in the target battery cluster group.

[0015] In the technical solution of the embodiment of the present application, the imbalance portion is related to the imbalance of the historical total charge and discharge capacity of each battery cluster, that is, the imbalance portion can be used to represent the balance of the number of cycles of each battery cluster, so that the purpose of balancing the number of cycles of each battery cluster can be achieved by solving the objective function including the imbalance portion.

[0016] In some embodiments, the charge and discharge power loss portion of each battery cluster in the target battery cluster group is obtained, including: obtaining the charge and discharge power loss portion based on the electricity price corresponding to the unit power and the sub-charge and discharge power corresponding to each battery cluster in the target battery cluster group, so that the purpose of optimizing the charge and discharge efficiency of each battery cluster can be achieved by solving the objective function including the charge and discharge power loss portion.

[0017] In some embodiments, the preset restriction conditions include: a first power restriction condition and a second power restriction condition; wherein the first power restriction condition is that the sum of the sub-charge and discharge powers corresponding to each battery cluster in the target battery cluster group is equal to the target charge and discharge power corresponding to the target battery cluster group; the second power restriction condition is that the sub-charge and discharge powers corresponding to each battery cluster in the target battery cluster group are within a preset sub-charge and discharge power restriction range.

[0018] In some embodiments, at least one target battery cluster group that needs to be charged and discharged, and a target charge and discharge power corresponding to each target battery cluster group are determined from at least one battery cluster group based on the total charge and discharge power and the charge and discharge power limit corresponding to each battery cluster group, including: determining a first candidate battery cluster with the highest charge and discharge priority from at least one battery cluster group based on the total charge and discharge power; if the absolute value of the charge and discharge power limit corresponding to the first candidate battery cluster is greater than the absolute value of the total charge and discharge power, then using the first candidate battery cluster as the target battery cluster group, and using the total charge and discharge power as the target charge and discharge power corresponding to the target battery cluster group.

[0019] In some embodiments, at least one target battery cluster group that needs to be charged and discharged, and the target charge and discharge power corresponding to each target battery cluster group are determined from at least one battery cluster group based on the total charge and discharge power and the charge and discharge power limit corresponding to each battery cluster group, and the method further includes: if the absolute value of the charge and discharge power limit corresponding to the first candidate battery cluster is not greater than the absolute value of the total charge and discharge power, the first candidate battery cluster is used as the first target battery cluster group, and the charge and discharge power limit corresponding to the first candidate battery cluster is used as the target charge and discharge power corresponding to the first target battery cluster group; a second candidate battery cluster with the second highest charge and discharge priority is determined from at least one battery cluster group; if the absolute value of the charge and discharge power limit corresponding to the second candidate battery cluster is greater than a preset absolute value, the second candidate battery cluster is used as the second target battery cluster group, and the difference between the total charge and discharge power and the charge and discharge power limit corresponding to the first candidate battery cluster is used as the target charge and discharge power corresponding to the second target battery cluster group; wherein the preset absolute value is the absolute value of the difference between the total charge and discharge power and the charge and discharge power limit corresponding to the first candidate battery cluster.

[0020] In some embodiments, dividing each battery cluster into at least one battery cluster group according to the SOC of each battery cluster includes dividing each battery cluster into at least one battery cluster group according to the SOC of each battery cluster and a plurality of preset charge and discharge thresholds.

[0021] In some embodiments, each battery cluster is divided into at least one battery cluster group according to the SOC of each battery cluster and multiple preset charge and discharge thresholds, including: determining multiple target charge and discharge thresholds from multiple preset charge and discharge thresholds according to the total charge and discharge power; and dividing each battery cluster into at least one battery cluster group according to the SOC of each battery cluster and multiple target charge and discharge thresholds.

[0022] In some embodiments, obtaining the total charge and discharge power allocated to each battery cluster in the energy storage device includes: obtaining a power scheduling request value; and determining the total charge and discharge power according to the power scheduling request value and the total power generation power of the power generation device.

[0023] In some embodiments, each battery cluster is controlled to charge and discharge according to the sub-charge and discharge power allocated to each battery cluster, including: for each battery cluster, the sub-charge and discharge power corresponding to the battery cluster is sent to the DC / DC corresponding to the battery cluster to control the charging and discharging of the DC / DC and the power grid.

[0024] In a second aspect, the present application provides a charge and discharge power distribution device for an energy storage device, the device comprising: an acquisition module for obtaining the total charge and discharge power allocated to each battery cluster in the energy storage device; a distribution module for distributing the total charge and discharge power with the optimal charge and discharge efficiency of each battery cluster of the energy storage device and a balanced number of cycles of each battery cluster as the distribution target, so as to obtain the sub-charge and discharge power allocated to each battery cluster; and a control module for controlling the charging and discharging of each battery cluster according to the sub-charge and discharge power allocated to each battery cluster.

[0025] In a third aspect, the present application provides a charging and discharging power distribution device for an energy storage device, including a memory and a processor. The memory stores a computer program, and when the processor executes the computer program, the steps in the embodiment of the charging and discharging power distribution method for the above-mentioned energy storage device are implemented.

[0026] In a fourth aspect, the present application provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the steps in the embodiment of the method for distributing charging and discharging power of the energy storage device described above are implemented.

[0027] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0029] FIG1 is a structural diagram of a charging and discharging power distribution system according to an embodiment of the present application;

[0030] FIG2 is a second structural diagram of the charging and discharging power distribution system provided in an embodiment of the present application;

[0031] FIG3 is a flow chart of a method for distributing charging and discharging power of an energy storage device according to some embodiments of the present application;

[0032] FIG4 is a flow chart of a method for distributing charging and discharging power of an energy storage device according to other embodiments of the present application;

[0033] FIG5 is a flow chart of a method for distributing charging and discharging power of an energy storage device according to other embodiments of the present application;

[0034] FIG6 is a flow chart of a method for distributing charging and discharging power of an energy storage device according to other embodiments of the present application;

[0035] FIG7 is a schematic diagram of the structure of a charging and discharging power distribution device provided in some embodiments of the present application;

[0036] FIG8 is a schematic diagram of the structure of a charging and discharging power distribution device in some embodiments of the present application. DETAILED DESCRIPTION

[0037] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the term "include" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0039] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood as indicating or implying relative importance or implicitly indicating the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is two or more (including two), unless otherwise clearly and specifically defined.

[0040] The charging and discharging power distribution method, apparatus, device, and storage medium for energy storage devices provided in the embodiments of the present application can be applied to charging and discharging power distribution application scenarios of energy storage devices under new energy power generation or conventional energy power generation, for example, charging and discharging power distribution application scenarios of industrial energy storage devices, charging and discharging power distribution application scenarios of household energy storage devices, or charging and discharging power distribution application scenarios of energy storage devices at charging stations, etc.

[0041] It should be noted that, for ease of explanation, the following embodiments use the method of the present invention as an example of an application scenario in which the charging and discharging power distribution method, apparatus, device, and storage medium for distributing charging and discharging power to an energy storage device in a renewable energy power generation environment. It should be understood that when the method, apparatus, device, and storage medium for distributing charging and discharging power to an energy storage device in the present invention are applied to other scenarios, their implementation principles and technical effects are similar.

[0042] For example, the renewable energy generation in the embodiments of the present application may include but is not limited to photovoltaic power generation and / or wind power generation. For ease of explanation, the following embodiments of the present application are described using renewable energy generation including photovoltaic power generation as an example.

[0043] Typically, energy storage devices include multiple battery clusters. The charge and discharge balance of these clusters significantly impacts the normal operation of the energy storage device. Therefore, managing the charge and discharge balance of multiple battery clusters is an important research topic.

[0044] Related technologies manage the SOC balance of battery clusters based on the SOC of each battery cluster. However, this technology suffers from uneven operating lifespans across different battery clusters. Some battery clusters may reach their end of life early, causing the energy storage system to malfunction.

[0045] In order to solve the problem of uneven operating life of different battery clusters in the related art, the embodiments of the present application propose to distribute the total charge and discharge power by taking the optimization of the charge and discharge efficiency of each battery cluster of the energy storage device and the balance of the number of cycles of each battery cluster as the distribution goals, so as to obtain the sub-charge and discharge power allocated to each battery cluster, so that when each battery cluster is charged and discharged according to the allocated sub-charge and discharge power, the charge and discharge efficiency of each battery cluster can be optimized and the number of cycles of each battery cluster can be balanced, which is conducive to achieving the optimal operation of the overall efficiency of the energy storage system while also improving the operating life of the energy storage system.

[0046] FIG1 is a first structural diagram of a charging and discharging power distribution system according to an embodiment of the present application. As shown in FIG1 , the charging and discharging power distribution system according to an embodiment of the present application may include, but is not limited to, multiple power generation devices 10, a charging and discharging power distribution device 11, an energy storage device 12, and a power grid 13. The energy storage device 12 may include, but is not limited to, multiple battery clusters (or racks) 120, each of which may include multiple connected battery packs (or packs).

[0047] The charge-discharge power distribution device 11 in the embodiment of the present application can use the charge-discharge power distribution method for energy storage devices provided in the embodiment of the present application to control the charging and discharging of the energy storage device 12. It should be understood that when the energy storage device 12 is in a charging state, the energy storage device 12 can be used to store the electrical energy generated by the power generation device 10. When the energy storage device 12 is in a discharging state, the energy storage device 12 can be used to release the stored electrical energy of the energy storage device 12 to the power grid 13.

[0048] FIG2 is a second structural diagram of a charging and discharging power distribution system provided in an embodiment of the present application. As shown in FIG2 , the charging and discharging power distribution system in an embodiment of the present application may include, but is not limited to: multiple photovoltaic power generation devices 20, a power conversion system (PCS) 21, an energy storage device 22, a transformer (Transfer) 23, and a grid (Grid) 24. It should be understood that the charging and discharging power distribution system in an embodiment of the present application may also be referred to as a photovoltaic-storage DC coupled system.

[0049] Among them, PCS21 can control the charging and discharging process of the energy storage device 22 and perform AC-DC conversion. Exemplarily, PCS21 may include but is not limited to: a local energy management system (Local-Energy Management System, L-EMS) 210, a maximum power point tracking (Maximum Power Point Tracking, MPPT) 211 and a DC-to-AC converter (DC / AC) 212. Among them, MPPT 211 can adjust the operating point of the photovoltaic power generation equipment to always enable the photovoltaic power generation equipment to output maximum power. It should be understood that the MPPT 211 in the embodiment of the present application can also be independent of PCS21 and be arranged between the photovoltaic power generation equipment 20 and PCS21.

[0050] It should be noted that the charging and discharging power distribution device in the embodiment of the present application may include but is not limited to the local energy management system 210 in the energy storage converter 21. The local energy management system 210 in the embodiment of the present application may use the charging and discharging power distribution method for energy storage devices provided in the embodiment of the present application to control the charging and discharging of the energy storage device 22.

[0051] The transformer 23 may be used to convert the electrical energy of the energy storage device 22 and / or the photovoltaic power generation device 20 and transmit the converted electrical energy to the power grid 24 .

[0052] The energy storage device 22 may include, but is not limited to, multiple battery clusters (or racks) 220. Each battery cluster 220 may be connected to the energy storage converter 21 via a corresponding DC-to-DC converter (DC / DC) 221. It should be understood that each battery cluster 220 and its corresponding DC / DC 221 may be independently located in a corresponding electrical cabinet, or multiple battery clusters 220 and their corresponding DC / DCs 221 may be located together in the same electrical cabinet.

[0053] In some embodiments, FIG3 is a flow chart of a method for distributing charge and discharge power of an energy storage device provided in some embodiments of the present application. In the embodiments of the present application, the method is described by applying the above-mentioned charge and discharge power distribution device as an example. As shown in FIG3, the method of the embodiment of the present application may include the following steps:

[0054] Step S301: Obtain the total charge and discharge power allocated to each battery cluster in the energy storage device.

[0055] In this step, the charge / discharge power distribution device can obtain the total charge / discharge power allocated to each battery cluster in the energy storage device. It should be understood that the total charge / discharge power in the embodiments of the present application can be positive, negative, or zero. Specifically, if the total charge / discharge power is positive, the energy storage device needs to discharge; if the total charge / discharge power is negative, the energy storage device needs to charge; and if the total charge / discharge power is zero, the energy storage device does not need to charge or discharge.

[0056] In a possible implementation, a power scheduling request value is obtained, and the total charge and discharge power is determined according to the power scheduling request value and the total power generation power of the power generation equipment.

[0057] The power scheduling request value in the embodiment of the present application can be used to indicate the active power value requested for scheduling.

[0058] In this implementation, the charging and discharging power distribution device can obtain the power scheduling request value from the scheduling device (or so-called station-side EMS), and use the difference between the power scheduling request value and the total power generation power of the power generation equipment in the charging and discharging power distribution system (for example, the photovoltaic power generation equipment in Figure 2) as the total charging and discharging power.

[0059] It should be understood that the charging and discharging power distribution method for energy storage equipment provided in the embodiment of the present application is applied to the charging and discharging power distribution application scenario of energy storage equipment in electrical equipment, that is, when the charging and discharging power distribution system does not include power generation equipment, the charging and discharging power distribution equipment can use the power scheduling request value as the total charging and discharging power.

[0060] In another possible implementation, the charging and discharging power distribution device may obtain the total charging and discharging power from the scheduling device.

[0061] Of course, the charging and discharging power distribution device can also obtain the total charging and discharging power through other methods.

[0062] Step S302 : allocating the total charge and discharge power to obtain the sub-charge and discharge power allocated to each battery cluster, with the optimal charge and discharge efficiency of each battery cluster and the balanced number of cycles of each battery cluster as allocation targets.

[0063] The number of cycles of the battery cluster involved in the embodiments of the present application may refer to the number of life cycles (or simply the number of cycles) that the battery cluster has been used.

[0064] In this step, the charge and discharge power distribution device can distribute the total charge and discharge power with the optimization of the charge and discharge efficiency of each battery cluster of the energy storage device and the balance of the number of cycles of each battery cluster as the distribution goals, so as to obtain the sub-charge and discharge power allocated to each battery cluster, so that when each battery cluster is charged and discharged according to the allocated sub-charge and discharge power, the charge and discharge efficiency of each battery cluster can be optimized and the number of cycles (or historical charge and discharge capacity) of each battery cluster can be balanced. This is conducive to achieving the optimal operation of the overall efficiency of the energy storage system while also improving the operating life of the energy storage system, thereby maximizing the economic benefits of the energy storage system.

[0065] It should be understood that the sub-charge and discharge power allocated to any battery cluster in the embodiments of the present application may include, but is not limited to, positive, negative, or zero. If the sub-charge and discharge power allocated to any battery cluster is positive, the battery cluster needs to be discharged; if the sub-charge and discharge power allocated to any battery cluster is negative, the battery cluster needs to be charged; and if the sub-charge and discharge power allocated to any battery cluster is zero, the battery cluster does not need to be charged or discharged.

[0066] In one possible implementation, the charge and discharge power distribution device may divide the battery clusters of the energy storage device into multiple battery cluster groups and determine at least one target battery cluster group to be charged and discharged from the multiple battery cluster groups. Furthermore, the charge and discharge power distribution device may allocate the total charge and discharge power based on optimizing the charge and discharge efficiency of each battery cluster in each target battery cluster group and balancing the number of cycles of each battery cluster, thereby obtaining a sub-charge and discharge power allocated to each battery cluster in each target battery cluster group.

[0067] It can be seen that in this implementation, the charge and discharge power distribution device can not only improve the charge and discharge power distribution efficiency but also increase the service life of each battery cluster in the energy storage system by distributing power only to the battery clusters in the screened target battery cluster groups.

[0068] In another possible implementation, the charge and discharge power distribution device can regard the battery clusters of the energy storage device as a battery cluster group, and directly distribute the total charge and discharge power based on the optimal charge and discharge efficiency of each battery cluster and the balanced number of cycles of each battery cluster as the distribution target, so as to obtain the sub-charge and discharge power allocated to each battery cluster.

[0069] Of course, with the distribution goals of optimizing the charge and discharge efficiency of each battery cluster of the energy storage device and balancing the number of cycles of each battery cluster, the charge and discharge power distribution device can also distribute the total charge and discharge power in other ways.

[0070] Step S303 : Control each battery cluster to charge and discharge according to the sub-charge and discharge power allocated to each battery cluster.

[0071] In this step, the charge-discharge power distribution device can control each battery cluster to charge and discharge according to the assigned sub-charge-discharge power based on the assigned sub-charge-discharge power to each battery cluster. It should be understood that if the sub-charge-discharge power assigned to any battery cluster is a positive number, the charge-discharge power distribution device can control the battery cluster to discharge according to the assigned sub-charge-discharge power; if the sub-charge-discharge power assigned to any battery cluster is a negative number, the charge-discharge power distribution device can control the battery cluster to charge according to the assigned sub-charge-discharge power; if the sub-charge-discharge power assigned to any battery cluster is zero, the charge-discharge power distribution device can control the battery cluster to not charge or discharge.

[0072] In a possible implementation, for each battery cluster, the sub-charging and discharging power corresponding to the battery cluster is sent to the DC / DC corresponding to the battery cluster, so as to control the charging and discharging of the DC / DC and the power grid.

[0073] In this implementation, when each battery cluster is connected to the charge and discharge power distribution device through the corresponding DC / DC, for each battery cluster, the charge and discharge power distribution device can send the sub-charge and discharge power corresponding to the battery cluster to the DC / DC corresponding to the battery cluster to control the DC / DC to charge and discharge with the power grid according to the sub-charge and discharge power.

[0074] It can be seen that in this implementation, the charging and discharging power distribution device controls the charging and discharging of each DC / DC with the power grid by sending the sub-charging and discharging power corresponding to each battery cluster to the DC / DC corresponding to each battery cluster. This not only realizes independent charging and discharging control of each battery cluster, thereby improving the charging and discharging control efficiency, but also helps to improve the operating stability of each battery cluster.

[0075] In another possible implementation, for each battery cluster, the sub-charging and discharging power corresponding to the battery cluster is sent to a battery management system (BMS) corresponding to the battery cluster to control the charging and discharging between the BMS and the power grid.

[0076] In this implementation, for each battery cluster, the charge and discharge power distribution device may send the sub-charge and discharge power corresponding to the battery cluster to the BMS corresponding to the battery cluster, so as to control the BMS to charge and discharge with the power grid according to the sub-charge and discharge power.

[0077] It can be seen that the charge and discharge power distribution device can realize independent charge and discharge control of each battery cluster by sending the sub-charge and discharge power corresponding to each battery cluster to the BMS corresponding to each battery cluster to control the charging and discharging of each BMS and the power grid, which is conducive to improving the charge and discharge control efficiency.

[0078] Of course, the charge and discharge power distribution device may also control the charge and discharge of each battery cluster in other ways according to the sub-charge and discharge powers allocated to each battery cluster.

[0079] In summary, in the embodiments of the present application, by obtaining the total charge and discharge power allocated to each battery cluster in the energy storage device, and with the optimal charge and discharge efficiency of each battery cluster of the energy storage device and the balanced number of cycles of each battery cluster as the allocation target, the total charge and discharge power is allocated to obtain the sub-charge and discharge power allocated to each battery cluster. Furthermore, the charging and discharging of each battery cluster is controlled based on the sub-charge and discharge power allocated to each battery cluster. It can be seen that compared with the method of achieving SOC balance management of battery clusters based on the SOC of each battery cluster in the related art, in the embodiments of the present application, by with the optimal charge and discharge efficiency of each battery cluster of the energy storage device and the balanced number of cycles of each battery cluster as the allocation target, the total charge and discharge power is allocated to obtain the sub-charge and discharge power allocated to each battery cluster. When each battery cluster is charged and discharged according to the allocated sub-charge and discharge power, the charge and discharge efficiency of each battery cluster can be optimized and the number of cycles of each battery cluster can be balanced, which is conducive to achieving the optimal overall efficiency of the energy storage system while also improving the operating life of the energy storage system.

[0080] In some embodiments, FIG4 is a flow chart of a method for allocating charge and discharge power for an energy storage device provided in other embodiments of the present application. Based on the above embodiments, the present application provides an exemplary description of the relevant content in step S302, "allocating the total charge and discharge power to obtain the sub-charge and discharge power allocated to each battery cluster, with the optimal charge and discharge efficiency of each battery cluster of the energy storage device and a balanced number of cycles of each battery cluster as the allocation goals." As shown in FIG4 , step S302 may include the following steps:

[0081] Step S3021 : Divide each battery cluster into at least one battery cluster group according to the SOC of each battery cluster; wherein different battery cluster groups have different charge and discharge priorities.

[0082] In this step, the charge and discharge power distribution device can divide the battery clusters of the energy storage device into at least one battery cluster group by comparing the SOC of each battery cluster with multiple preset charge and discharge thresholds or multiple preset charge and discharge ranges; wherein different battery cluster groups have different charge and discharge priorities.

[0083] In a possible implementation, each battery cluster is divided into at least one battery cluster group according to the SOC of each battery cluster and a plurality of preset charge and discharge thresholds.

[0084] For example, the multiple preset charge and discharge thresholds in the embodiments of the present application may include, but are not limited to, at least one of the following thresholds: a non-discharge threshold SOC_not_allow_disch, a priority discharge threshold SOC_pre_disch, a priority charge threshold SOC_pre_chrg, and a non-charge threshold SOC_not_allow_chrg, which are successively larger. For example, the non-discharge threshold SOC_not_allow_disch may be 5%, the priority discharge threshold SOC_pre_disch may be 20%, the priority charge threshold SOC_pre_chrg may be 80%, and the non-charge threshold SOC_not_allow_chrg may be 100%.

[0085] In this implementation, the charge and discharge power distribution device may divide each battery cluster into at least one battery cluster group by comparing the SOC of each battery cluster with a plurality of preset charge and discharge thresholds.

[0086] For ease of understanding, in the following embodiments of the present application, multiple preset charge and discharge thresholds including: a non-discharge threshold SOC_not_allow_disch, a priority discharge threshold SOC_pre_disch, a priority charge threshold SOC_pre_chrg and a non-charge threshold SOC_not_allow_chrg are taken as an example to exemplify the relevant content of dividing each battery cluster into at least one battery cluster group.

[0087] Exemplarily, the charge and discharge power distribution device may divide each battery cluster in the energy storage device whose SOC is less than or equal to the non-discharge threshold SOC_not_allow_disch into a priority charging and non-discharging battery cluster group, divide each battery cluster in the energy storage device whose SOC is greater than the non-discharge threshold SOC_not_allow_disch and less than or equal to the priority discharge threshold SOC_pre_disch into a priority charging and second priority discharging battery cluster group, divide each battery cluster in the energy storage device whose SOC is greater than the priority discharge threshold SOC_pre_disch and less than or equal to the priority charging threshold SOC_pre_chrg into a priority charging and discharging battery cluster group, divide each battery cluster in the energy storage device whose SOC is greater than the priority charging threshold SOC_pre_chrg and less than or equal to the non-chargeable threshold SOC_not_allow_chrg into a priority discharging and second priority charging battery cluster group, and divide each battery cluster in the energy storage device whose SOC is greater than the non-chargeable threshold SOC_not_allow_chrg into a priority discharging and non-charging battery cluster group.

[0088] It can be seen that in this implementation, by dividing each battery cluster into at least one battery cluster group according to the SOC of each battery cluster and multiple preset charge and discharge thresholds, each battery cluster whose SOC meets different charge and discharge threshold ranges can be divided into the same battery cluster group, so that the charge and discharge priorities of different battery cluster groups are different, so that power can be subsequently allocated according to the battery cluster group, which is conducive to improving the accuracy of power allocation, thereby further improving the overall efficiency and service life of the energy storage system.

[0089] Furthermore, taking into account the differences between charging and discharging conditions, multiple target charge and discharge thresholds are determined from multiple preset charge and discharge thresholds according to the total charge and discharge power, and each battery cluster is divided into at least one battery cluster group according to the SOC of each battery cluster and the multiple target charge and discharge thresholds.

[0090] For example, the multiple target charge and discharge thresholds in the embodiment of the present application may include but are not limited to: a non-discharge threshold SOC_not_allow_disch and a priority discharge threshold SOC_pre_disch; or, a priority charge threshold SOC_pre_chrg and a non-charge threshold SOC_not_allow_chrg.

[0091] In an embodiment of the present application, the charge and discharge power distribution device can determine multiple target charge and discharge thresholds from multiple preset charge and discharge thresholds based on the positive or negative value of the total charge and discharge power. For example, if the total charge and discharge power is a positive number, the charge and discharge power distribution device can determine multiple target charge and discharge thresholds related to discharge from multiple preset charge and discharge thresholds, such as the non-discharge threshold SOC_not_allow_disch and the priority discharge threshold SOC_pre_disch. As another example, if the total charge and discharge power is a negative number, the charge and discharge power distribution device can determine multiple target charge and discharge thresholds related to charging from multiple preset charge and discharge thresholds, such as the priority charge threshold SOC_pre_chrg and the non-charge threshold SOC_not_allow_chrg.

[0092] Furthermore, the charge and discharge power distribution device may divide each battery cluster into at least one battery cluster group by comparing the SOC of each battery cluster with a plurality of target charge and discharge thresholds.

[0093] For ease of understanding, the following embodiments of the present application take a discharge scenario and multiple target charge and discharge thresholds including a non-discharge threshold SOC_not_allow_disch and a priority discharge threshold SOC_pre_disch as examples to exemplify the relevant content of dividing each battery cluster into at least one battery cluster group.

[0094] Exemplarily, the charge and discharge power distribution device may divide each battery cluster in the energy storage device whose SOC is less than or equal to the non-discharge threshold SOC_not_allow_disch into a non-discharge battery cluster group, divide each battery cluster in the energy storage device whose SOC is greater than the non-discharge threshold SOC_not_allow_disch and less than or equal to the priority discharge threshold SOC_pre_disch into a second priority discharge battery cluster group, and divide each battery cluster in the energy storage device whose SOC is greater than the priority discharge threshold SOC_pre_disch into a priority discharge battery cluster group.

[0095] It can be seen that in this implementation, by dividing each battery cluster into at least one battery cluster group based on multiple target charge and discharge thresholds determined from multiple preset charge and discharge thresholds according to the total charge and discharge power, and the SOC of each battery cluster, it is possible to divide each battery cluster into required battery cluster groups, so that power can be subsequently allocated according to the battery cluster groups, which is beneficial to improving power allocation efficiency.

[0096] In another possible implementation, each battery cluster is divided into at least one battery cluster group according to the SOC of each battery cluster and a plurality of preset charge and discharge ranges.

[0097] For example, the multiple preset charge and discharge ranges in the embodiments of the present application may include, but are not limited to, at least one of the following ranges: a priority charge and no discharge range, a priority charge and second priority discharge range, a priority charge and discharge range, a priority discharge and second priority charge range, and a priority discharge and no charge range. It should be understood that each preset charge and discharge range includes corresponding upper and lower SOC thresholds.

[0098] In this implementation, the charge and discharge power distribution device may divide the battery clusters whose SOCs belong to the same preset charge and discharge range into a battery cluster group by comparing the SOCs of the battery clusters with a plurality of preset charge and discharge ranges.

[0099] Of course, the charge and discharge power distribution device may also divide each battery cluster into at least one battery cluster group in other ways.

[0100] Step S3022: Determine at least one target battery cluster group to be charged or discharged and the target charge or discharge power corresponding to each target battery cluster group from at least one battery cluster group according to the total charge or discharge power and the charge or discharge power limit corresponding to each battery cluster group.

[0101] For example, the charge and discharge power limit corresponding to any battery cluster group in the embodiments of the present application can be used to indicate the sum of the sub-charge and discharge power limit values ​​corresponding to each battery cluster in the battery cluster group. It should be understood that in a discharging scenario, the charge and discharge power limit corresponding to any battery cluster group can be used to indicate the sum of the sub-discharge power limit values ​​corresponding to each battery cluster in the battery cluster group; in a charging scenario, the charge and discharge power limit corresponding to any battery cluster group can be used to indicate the sum of the sub-charging power limit values ​​corresponding to each battery cluster in the battery cluster group.

[0102] It should be noted that in the discharge scenario, the sub-discharge power limit or the charge and discharge power limit involved in the embodiment of the present application can be a positive number; in the charging scenario, the sub-charging power limit or the charge and discharge power limit involved in the embodiment of the present application can be a negative number.

[0103] In this step, the charge and discharge power distribution device can determine at least one target battery cluster group that needs to be charged and discharged, and the target charge and discharge power corresponding to each target battery cluster group from at least one battery cluster group according to the positive and negative total charge and discharge power and the charge and discharge power limit corresponding to each battery cluster group.

[0104] Exemplarily, if the total charge and discharge power is a positive number, the charge and discharge power distribution device can determine at least one target battery cluster group that needs to be discharged and the target discharge power corresponding to each target battery cluster group from at least one battery cluster group based on the total charge and discharge power and the charge and discharge power limit corresponding to each battery cluster group (used to indicate the sum of the sub-discharge power limit values ​​corresponding to each battery cluster in the battery cluster group).

[0105] As another example, if the total charge and discharge power is a negative number, the charge and discharge power distribution device can determine at least one target battery cluster group that needs to be charged and the target charging power corresponding to each target battery cluster group from at least one battery cluster group based on the total charge and discharge power and the charge and discharge power limit corresponding to each battery cluster group (used to indicate the sum of the sub-charging power limit values ​​corresponding to each battery cluster in the battery cluster group).

[0106] In one possible implementation, the charge and discharge power distribution device can determine at least one target battery cluster group that needs to be charged and discharged, and the target charge and discharge power corresponding to each target battery cluster group from at least one battery cluster group in descending order of charge and discharge priority based on the positive and negative total charge and discharge power and the charge and discharge power limit corresponding to each battery cluster group.

[0107] In this implementation, the charge and discharge power distribution device may determine a first candidate battery cluster with the highest charge and discharge priority from at least one battery cluster group according to the total charge and discharge power.

[0108] Exemplarily, if the total charge and discharge power is a positive number, the charge and discharge power distribution device may determine a first candidate battery cluster with the highest discharge priority from at least one battery cluster group. In another exemplary embodiment, if the total charge and discharge power is a negative number, the charge and discharge power distribution device may determine a first candidate battery cluster with the highest charging priority from at least one battery cluster group.

[0109] Furthermore, if the absolute value of the charge and discharge power limit corresponding to the first candidate battery cluster is greater than the absolute value of the total charge and discharge power (that is, the total discharge power can be met by charging and discharging the first candidate battery cluster), the first candidate battery cluster is used as the target battery cluster group, and the total charge and discharge power is used as the target charge and discharge power corresponding to the target battery cluster group.

[0110] For example, if the total charge and discharge power is a positive number, and the charge and discharge power limit corresponding to the first candidate battery cluster (used to indicate the sum of the sub-discharge power limits corresponding to each battery cluster in the battery cluster group) is greater than the total charge and discharge power, the charge and discharge power allocation device can use the first candidate battery cluster as the target battery cluster group that needs to be discharged, and use the total charge and discharge power as the target discharge power corresponding to the target battery cluster group.

[0111] As another example, if the total charge and discharge power is a negative number, and the absolute value of the charge and discharge power limit corresponding to the first candidate battery cluster (used to indicate the sum of the sub-charging power limits corresponding to each battery cluster in the battery cluster group) is greater than the absolute value of the total charge and discharge power, the charge and discharge power distribution device can use the first candidate battery cluster as the target battery cluster group that needs to be charged, and use the total charge and discharge power as the target charging power corresponding to the target battery cluster group.

[0112] Furthermore, if the absolute value of the charge and discharge power limit corresponding to the first candidate battery cluster is not greater than the absolute value of the total charge and discharge power (that is, the total discharge power cannot be met by charging and discharging the first candidate battery cluster), the first candidate battery cluster is used as the first target battery cluster group, and the charge and discharge power limit corresponding to the first candidate battery cluster is used as the target charge and discharge power corresponding to the first target battery cluster group.

[0113] Furthermore, a second candidate battery cluster having the second highest charge and discharge priority is determined from at least one battery cluster group; if the absolute value of the charge and discharge power limit corresponding to the second candidate battery cluster is greater than a first preset absolute value, the second candidate battery cluster is used as a second target battery cluster group, and the difference between the total charge and discharge power and the charge and discharge power limit corresponding to the first candidate battery cluster is used as the target charge and discharge power corresponding to the second target battery cluster group; wherein the first preset absolute value is the absolute value of the difference between the total charge and discharge power and the charge and discharge power limit corresponding to the first candidate battery cluster (i.e., the total discharge power can be met by charging and discharging the first candidate battery cluster and the second candidate battery cluster).

[0114] Exemplarily, if the total charge and discharge power is a positive number, the charge and discharge power distribution device may determine a second candidate battery cluster with the second highest discharge priority from the at least one battery cluster grouping. In another exemplary embodiment, if the total charge and discharge power is a negative number, the charge and discharge power distribution device may determine a second candidate battery cluster with the second highest charging priority from the at least one battery cluster grouping.

[0115] It should be noted that if the absolute value of the charge and discharge power limit corresponding to the second candidate battery cluster is still not greater than the first preset absolute value (i.e., the total discharge power cannot be met by charging and discharging the first and second candidate battery clusters), a third candidate battery cluster with the next highest charge and discharge priority needs to be determined from at least one battery cluster group. If the absolute value of the charge and discharge power limit corresponding to the third candidate battery cluster is greater than the second preset absolute value (the second preset absolute value is the absolute value of the difference between the total charge and discharge power and the charge and discharge power limits corresponding to the first and second candidate battery clusters, respectively; i.e., the total discharge power can be met by charging and discharging the first, second, and third candidate battery clusters), the third candidate battery cluster is defined as the third target battery cluster group, and the difference between the total charge and discharge power and the charge and discharge power limits corresponding to the first and second candidate battery clusters, respectively, is used as the target charge and discharge power corresponding to the third target battery cluster group. The charge and discharge priority of the first candidate battery cluster is higher than that of the second candidate battery cluster, and the charge and discharge priority of the second candidate battery cluster is higher than that of the third candidate battery cluster.

[0116] It can be seen that in this implementation, the charge and discharge power distribution device selects the target battery cluster groups that need to be charged and discharged from at least one battery cluster group in the order of charge and discharge priority from high to low according to the total charge and discharge power and the charge and discharge power limit corresponding to each battery cluster group, and the target charge and discharge power corresponding to each target battery cluster group. This can achieve priority charging and discharging of each target battery cluster that needs to be charged and discharged, which is beneficial to further improve the balance of the number of cycles of each battery cluster of the energy storage device.

[0117] In another possible implementation, the charge and discharge power distribution device can determine at least one target battery cluster group that needs to be charged and discharged, and the target charge and discharge power corresponding to each target battery cluster group from at least one battery cluster group according to the total charge and discharge power and the charge and discharge power limit corresponding to each battery cluster group, in the order of the SOC of each battery cluster group from large to small or from small to large.

[0118] Of course, the charge and discharge power distribution device can also determine at least one target battery cluster group that needs to be charged and discharged, and the target charge and discharge power corresponding to each target battery cluster group, from at least one battery cluster group in other ways based on the total charge and discharge power and the charge and discharge power limit corresponding to each battery cluster group.

[0119] Step S3023: For each target battery cluster group, the target charge and discharge power corresponding to the target battery cluster group is allocated with the optimal charge and discharge efficiency of each battery cluster in the target battery cluster group and the balanced number of cycles of each battery cluster as the allocation target, so as to obtain the sub-charge and discharge power allocated to each battery cluster in the target battery cluster group.

[0120] In this step, for each target battery cluster group, the charge and discharge power distribution device can establish a charge and discharge power distribution model with the optimal charge and discharge efficiency of each battery cluster in the target battery cluster group and the balanced number of cycles of each battery cluster as the distribution target, and by solving the charge and discharge power distribution model, it is possible to distribute the target charge and discharge power corresponding to the target battery cluster group to obtain the sub-charge and discharge power allocated to each battery cluster in the target battery cluster group, so that when each battery cluster in the target battery cluster group is charged and discharged according to the allocated sub-charge and discharge power, the charge and discharge efficiency of each battery cluster of the energy storage device can be optimized and the number of cycles of each battery cluster can be balanced.

[0121] In one possible implementation, the charge and discharge power allocation model in the embodiment of the present application may be a machine learning model, wherein the input of the charge and discharge power allocation model may include but is not limited to the total charge and discharge power, and the output of the charge and discharge power allocation model may include but is not limited to the sub-charge and discharge power allocated to each battery cluster.

[0122] In another possible implementation, the charging and discharging power distribution model in the embodiment of the present application can be a mathematical model of the optimization problem, wherein the charging and discharging power distribution model can include but is not limited to an objective function and preset restrictions (or preset constraints).

[0123] For example, the charge and discharge power distribution device can use an optimization algorithm to solve the charge and discharge power distribution model to distribute the target charge and discharge power corresponding to the target battery cluster group, thereby obtaining the sub-charge and discharge power allocated to each battery cluster in the target battery cluster group. The optimization algorithm may include, but is not limited to, any of the following: a genetic algorithm, an annealing algorithm, and a particle swarm optimization algorithm.

[0124] In summary, in the embodiment of the present application, at least one target battery cluster group that needs to be charged and discharged and the target charge and discharge power corresponding to each target battery cluster group are determined based on the SOC of each battery cluster, the total charge and discharge power and the charge and discharge power limit corresponding to each battery cluster group. The target charge and discharge power corresponding to each target battery cluster group is allocated with the optimal charge and discharge efficiency of each battery cluster in each target battery cluster group and the balanced number of cycles of each battery cluster as the allocation target, so as to obtain the sub-charge and discharge power allocated to each battery cluster in each target battery cluster group. This facilitates the battery clusters in each target battery cluster group that needs to be charged and discharged to be charged and discharged according to the allocated sub-charge and discharge power, which can not only optimize the charge and discharge efficiency of each battery cluster of the energy storage device and balance the number of cycles of each battery cluster, but also help to improve the power allocation efficiency.

[0125] In some embodiments, FIG5 is a flow chart of a method for allocating charge and discharge power for an energy storage device provided in other embodiments of the present application. Based on the above embodiments, the present application provides an exemplary description of the relevant content in the above step S3023, "taking the optimal charge and discharge efficiency of each battery cluster in the target battery cluster group and the balanced number of cycles of each battery cluster as the allocation target, allocating the target charge and discharge power corresponding to the target battery cluster group to obtain the sub-charge and discharge power allocated to each battery cluster in the target battery cluster group." As shown in FIG5 , the above step S3023 may include the following steps:

[0126] Step S501 : Obtaining an objective function, wherein the objective function includes an imbalance degree portion and a charge and discharge power loss portion of historical charge and discharge capacities of each battery cluster in the target battery cluster group.

[0127] For example, the imbalance degree of the historical charge and discharge capacity of each battery cluster in the target battery cluster group in the embodiments of the present application can be used to indicate the total imbalance cost corresponding to the imbalance degree of the historical charge and discharge capacity of each battery cluster in the target battery cluster group. The imbalance degree of the historical charge and discharge capacity of each battery cluster refers to the difference in capacity between battery clusters due to their different lifespans, and can be used to quantify the difference in capacity between battery clusters.

[0128] The historical charge and discharge capacity of any battery cluster is positively correlated with the number of cycles of the battery cluster, that is, the greater the historical charge and discharge capacity of the battery cluster, the greater the number of cycles of the battery cluster.

[0129] For example, the charge and discharge power loss portion of each battery cluster in the target battery cluster group in the embodiment of the present application can be used to indicate the total loss cost corresponding to the charge and discharge power loss of each battery cluster in the target battery cluster group. The charge and discharge power loss of each battery cluster refers to the power loss in the energy conversion process of each battery cluster under charge and discharge conditions.

[0130] In this step, the charge-discharge power distribution device can obtain the imbalance portion and charge-discharge power loss portion of the historical charge-discharge capacity of each battery cluster in the target battery cluster group. Furthermore, the charge-discharge power distribution device can derive an objective function based on the imbalance portion and the charge-discharge power loss portion. That is, the objective function includes both the imbalance portion and the charge-discharge power loss portion. In other words, the objective function can be used to indicate the balance of the number of cycles and the charge-discharge efficiency of each battery cluster. By solving the objective function, the goal of achieving balanced cycle number and optimal charge-discharge efficiency for each battery cluster can be achieved.

[0131] The following embodiments of the present application provide an exemplary description of the method for obtaining the imbalance portion of the above-mentioned historical charge and discharge capacity.

[0132] Optionally, the imbalance of the historical charge and discharge capacity of each battery cluster in the target battery cluster group is obtained based on the historical total charge and discharge capacity and the corresponding sub-charge and discharge power of each battery cluster in the target battery cluster group; and the imbalance part is obtained based on the energy storage system cost corresponding to the unit charge and discharge capacity and the imbalance of the historical charge and discharge capacity of each battery cluster in the target battery cluster group.

[0133] For example, the historical total charge and discharge capacity of the battery cluster in the embodiment of the present application may include, but is not limited to, the historical total charge capacity of the battery cluster and the historical total discharge capacity of the battery cluster.

[0134] In the embodiment of the present application, for each battery cluster in the target battery cluster group, the charge and discharge power distribution device can determine the initial total charge and discharge capacity of the battery cluster by the following formula (1) based on the historical total charge and discharge capacity of the battery cluster.

[0135] in, represents the initial total charge and discharge capacity of battery cluster i in the target battery cluster group; Cap dischi represents the historical total discharge capacity of battery cluster i in the target battery cluster group; Cap chrgi Represents the historical total charging capacity of battery cluster i in the target battery cluster group.

[0136] Of course, the charge and discharge power distribution device may also determine the initial total charge and discharge capacity of the battery cluster by other variations of the above formula (1) or equivalent formulas based on the historical total charge and discharge capacity of the battery cluster.

[0137] Furthermore, the charge and discharge power distribution device obtains the imbalance degree of the historical charge and discharge capacity of each battery cluster in the target battery cluster group according to the initial total charge and discharge capacity and the corresponding sub-charge and discharge power of each battery cluster in the target battery cluster group.

[0138] For example, for each battery cluster in the target battery cluster group, the charge and discharge power distribution device can obtain the imbalance degree of the historical charge and discharge capacity of the battery cluster by the following formula (2) based on the initial total charge and discharge capacity of the battery cluster and the corresponding sub-charge and discharge power.

[0139] in, represents the imbalance degree of the historical charge and discharge capacity of battery cluster i in the target battery cluster group; N represents the total number of battery clusters in the target battery cluster group; Cap j represents the historical total charge and discharge capacity variation of battery cluster j in the target battery cluster group; Cap i Represents the historical total charge and discharge capacity variation formula of battery cluster i in the target battery cluster group; represents the initial total charge and discharge capacity of battery cluster j in the target battery cluster group; P j represents the sub-charge and discharge power corresponding to battery cluster j in the target battery cluster group; P i represents the sub-charge and discharge power corresponding to battery cluster i in the target battery cluster group; η() represents the efficiency function corresponding to the operating power; and T represents the power allocation calculation period.

[0140] It should be noted that the sub-charge and discharge power corresponding to each battery cluster involved in the above formula (2) is an unknown number, and the optimal sub-charge and discharge power needs to be obtained by solving the objective function. When each battery cluster is connected to the charge and discharge power distribution device through a corresponding DC / DC, η() in the above formula (2) can be the efficiency function corresponding to each power operation of the DC / DC, which can be obtained by fitting the efficiency test data of the DC / DC at the factory.

[0141] Of course, the charge and discharge power distribution device can also obtain the imbalance degree of the historical charge and discharge capacity of the battery cluster through other variations of the above formula (2) or equivalent formulas based on the initial total charge and discharge capacity of the battery cluster and the corresponding sub-charge and discharge power.

[0142] Furthermore, the charge and discharge power distribution device can obtain the imbalance of the historical charge and discharge capacity of each battery cluster in the target battery cluster group through the following formula (3) based on the energy storage system cost corresponding to the unit charge and discharge capacity and the imbalance of the historical charge and discharge capacity of each battery cluster in the target battery cluster group.

[0143] Among them, Cap dise represents the imbalance of the historical charge and discharge capacity of each battery cluster in the target battery cluster group; Cess represents the energy storage system cost corresponding to the unit charge and discharge capacity.

[0144] Of course, the charge and discharge power distribution device can also obtain the imbalance of the historical charge and discharge capacity of each battery cluster in the target battery cluster group through other variations or equivalent formulas of the above formula (3) based on the energy storage system cost corresponding to the unit charge and discharge capacity and the imbalance of the historical charge and discharge capacity of each battery cluster in the target battery cluster group.

[0145] It should be noted that the energy storage system cost corresponding to the unit charge and discharge capacity in the embodiment of the present application can be determined by the charge and discharge power distribution device according to the preset energy storage system cost, the preset single battery cluster capacity and the preset number of single battery cluster cycles.

[0146] For example, the charge and discharge power distribution device can determine the energy storage system cost corresponding to the unit charge and discharge capacity by the following formula (4) based on the preset energy storage system cost, the preset single battery cluster capacity and the preset single battery cluster cycle number.

[0147] Among them, Call ess Represents the preset energy storage system cost; Cap pack Represents the preset single battery cluster capacity; Num cycle Represents the preset number of cycles of a single battery cluster; N all Represents the total number of battery clusters in the energy storage device.

[0148] Of course, the charge and discharge power distribution device can also determine the energy storage system cost corresponding to the unit charge and discharge capacity through other variations of the above formula (4) or equivalent formulas based on the preset energy storage system cost, the preset single battery cluster capacity and the preset number of single battery cluster cycles.

[0149] In an embodiment of the present application, the imbalance of the historical charge and discharge capacity of each battery cluster in the target battery cluster group is obtained based on the historical total charge and discharge capacity of each battery cluster in the target battery cluster group and the corresponding sub-charge and discharge power. Furthermore, the imbalance portion is obtained based on the energy storage system cost corresponding to the unit charge and discharge capacity and the imbalance of the historical charge and discharge capacity of each battery cluster in the target battery cluster group. It can be seen that the imbalance portion in the embodiment of the present application is related to the imbalance of the historical total charge and discharge capacity of each battery cluster, that is, the imbalance portion can be used to represent the balance of the number of cycles of each battery cluster, so that by solving the objective function containing the imbalance portion, the purpose of balancing the number of cycles of each battery cluster can be achieved.

[0150] The following embodiments of this application provide an exemplary introduction to the method of obtaining the charge and discharge power loss portion.

[0151] Optionally, the charge and discharge power loss portion is obtained according to the electricity price corresponding to the unit power and the sub-charge and discharge power corresponding to each battery cluster in the target battery cluster group.

[0152] Exemplarily, the charge and discharge power distribution device may obtain the charge and discharge power loss portion by the following formula (5) based on the electricity price corresponding to the unit power and the sub-charge and discharge power corresponding to each battery cluster in the target battery cluster group.

[0153] Among them, P loss represents the charge and discharge power loss of each battery cluster in the target battery cluster group; Cele represents the electricity price corresponding to unit power.

[0154] Of course, the charge and discharge power distribution device can also obtain the charge and discharge power loss part through other variations or equivalent formulas of the above formula (5) according to the electricity price corresponding to the unit power and the sub-charge and discharge power corresponding to each battery cluster in the target battery cluster group.

[0155] It can be seen that in the embodiment of the present application, the charging and discharging power loss part is obtained based on the electricity price corresponding to the unit power and the sub-charging and discharging power corresponding to each battery cluster in the target battery cluster group, so that the purpose of optimizing the charging and discharging efficiency of each battery cluster can be achieved by solving the objective function including the charging and discharging power loss part.

[0156] Exemplarily, the charging and discharging power distribution device can obtain the objective function through the following formula (6) based on the imbalance part and the charging and discharging power loss part.

[0157] Among them, Obj fun Represents the objective function.

[0158] Of course, the charging and discharging power distribution device can also obtain the objective function through other variations or equivalent formulas of the above formula (6) according to the imbalance part and the charging and discharging power loss part.

[0159] It can be seen that the objective function in the embodiment of the present application includes both the imbalance part and the charge and discharge power loss part. By solving the objective function, the purpose of balancing the number of cycles of each battery cluster and optimizing the charge and discharge efficiency can be achieved.

[0160] Step S502 : Based on preset constraints and with the goal of minimizing the value of the objective function, solve the objective function to obtain the sub-charging and discharging power allocated to each battery cluster in the target battery cluster group.

[0161] In this step, the rationality of the sub-charge and discharge power allocated to each battery cluster is taken into consideration. The charge and discharge power distribution device can solve the objective function based on preset constraints and with the goal of minimizing the value of the objective function to obtain the sub-charge and discharge power allocated to each battery cluster in the target battery cluster group.

[0162] For example, the preset restriction conditions in the embodiments of the present application may include, but are not limited to: a first power restriction condition and a second power restriction condition.

[0163] The first power limitation condition may be that the sum of the sub-charge and discharge powers corresponding to the battery clusters in the target battery cluster group is equal to the target charge and discharge power corresponding to the target battery cluster group.

[0164] For example, the first power limit condition in the embodiment of the present application may be represented by the following formula (7):

[0165] Among them, P obj Represents the target charge and discharge power corresponding to the target battery cluster group.

[0166] Of course, the first power limitation condition in the embodiment of the present application can also refer to other variations or equivalent formulas of the above formula (7).

[0167] The second power limitation condition may be that the sub-charge and discharge power corresponding to each battery cluster in the target battery cluster group is within a preset sub-charge and discharge power limitation range.

[0168] For example, the second power limit condition in the embodiment of the present application may be represented by the following formula (8):

[0169] in, represents the sub-charging power limit of battery cluster i in the target battery cluster group; It should be understood that the lower limit of the preset sub-charge and discharge power limit range may be the sub-charge power limit, and the upper limit of the preset sub-charge and discharge power limit range may be the sub-discharge power limit.

[0170] Of course, the second power limitation condition in the embodiment of the present application can also refer to other variations or equivalent formulas of the above formula (8).

[0171] It can be seen that in the embodiment of the present application, by solving the objective function based on preset constraints and taking the minimum value of the objective function as the goal, so as to obtain the sub-charge and discharge power allocated to each battery cluster in the target battery cluster group, the charge and discharge efficiency of each battery cluster can be further optimized and the number of cycles of each battery cluster can be balanced.

[0172] In summary, in the embodiment of the present application, by obtaining the objective function, wherein the objective function includes the imbalance part and the charge and discharge power loss part of the historical charge and discharge capacity of each battery cluster in the target battery cluster group. Further, based on the preset constraint conditions, with the minimum value of the objective function as the goal, the objective function is solved to obtain the sub-charge and discharge power allocated to each battery cluster in the target battery cluster group. It can be seen that in the embodiment of the present application, by solving the objective function based on the preset constraint conditions with the minimum value of the objective function including the imbalance part and the charge and discharge power loss part as the goal, to obtain the sub-charge and discharge power allocated to each battery cluster in the target battery cluster group, the charge and discharge efficiency of each battery cluster can be further optimized and the number of cycles of each battery cluster can be balanced, thereby further facilitating the realization of the optimal operation of the overall efficiency of the energy storage system while also improving the operating life of the energy storage system.

[0173] In one embodiment, FIG6 is a flow chart of a method for distributing the charging and discharging power of an energy storage device according to another embodiment of the present application. Based on the above embodiment, the following embodiment of the present application takes the charging and discharging power distribution system shown in FIG2 as an example to exemplify the overall flow of the method for distributing the charging and discharging power of an energy storage device according to the embodiment of the present application. As shown in FIG6, the method according to the embodiment of the present application may include the following steps:

[0174] 1) Information collection process

[0175] In the embodiment of the present application, the charge and discharge power distribution device can collect battery cluster information of each battery cluster from the BMS corresponding to each battery cluster of the energy storage device, wherein the battery cluster information may include but is not limited to at least one of the following: SOC, historical total discharge capacity Cap disch 、Historical total charging capacity Cap chrg , Sub-charging power limit P chrglim , Sub-discharge power limit P dischlim .

[0176] In the embodiment of the present application, the charging and discharging power distribution device can collect the total power generation power P of each photovoltaic power generation device from the MPPT. MPPT .

[0177] 2) Power allocation process

[0178] In the embodiment of the present application, the charging and discharging power distribution device receives the power scheduling request value P sent by the scheduling device. need In the case of power scheduling request value P need And the total power generation P MPPT Determine the total charge and discharge power P BAT For example, the charging and discharging power distribution device can set the power scheduling request value P need and total power generation PMPPT The difference between the two is taken as the total charge and discharge power P BAT .

[0179] Furthermore, the charge and discharge power distribution device can divide each battery cluster of the energy storage device into at least one battery cluster group based on the SOC of each battery cluster and a plurality of preset charge and discharge thresholds, wherein different battery cluster groups have different charge and discharge priorities.

[0180] Furthermore, the charging and discharging power distribution device can be configured to distribute the total charging and discharging power P BAT and the charge and discharge power limit corresponding to each battery cluster group, determining at least one target battery cluster group that needs to be charged and discharged from at least one battery cluster group, and the target charge and discharge power P corresponding to each target battery cluster group obj .

[0181] Furthermore, for each target battery cluster group, the charge and discharge power distribution device can take the optimal charge and discharge efficiency of each battery cluster in the target battery cluster group and the balanced number of cycles of each battery cluster as the distribution target, and distribute the target charge and discharge power P corresponding to the target battery cluster group. obj The allocation is performed to obtain the sub-charge and discharge powers allocated to each battery cluster in the target battery cluster group.

[0182] For example, the charge and discharge power distribution device can obtain the objective function shown in the above formula (6), and based on the preset constraints shown in the above formulas (7) and (8), solve the objective function with the minimum value of the objective function as the goal, so as to obtain the sub-charge and discharge power P allocated to each battery cluster in the target battery cluster group. i .

[0183] Furthermore, for each battery cluster in each target battery cluster group, the charge and discharge power distribution device may send the sub-charge and discharge power allocated to the battery cluster to the DC / DC corresponding to the battery cluster to control the DC / DC to charge and discharge with the power grid according to the sub-charge and discharge power.

[0184] It should be noted that the implementation methods of each step in the embodiments of the present application can refer to the relevant content in the above embodiments and will not be repeated here.

[0185] It should be understood that, although the steps in the flowcharts of the above embodiments are shown in sequence as indicated by the arrows, these steps are not necessarily performed in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order restriction on the execution of these steps, and these steps can be performed in other orders. Moreover, at least a portion of the steps in the flowcharts of the above embodiments may include multiple steps or multiple stages, and these steps or stages are not necessarily performed at the same time, but can be performed at different times. The execution order of these steps or stages is not necessarily to be performed in sequence, but can be performed in turn or alternately with other steps or at least a portion of steps or stages in other steps.

[0186] Based on the same inventive concept, embodiments of the present application also provide a charge-discharge power distribution device for implementing the aforementioned charge-discharge power distribution method for energy storage devices. The solution provided by this device is similar to the solution described in the aforementioned method. Therefore, the specific limitations of one or more embodiments of the charge-discharge power distribution device provided below can be found in the limitations of the charge-discharge power distribution method described above and will not be repeated here.

[0187] In some embodiments, Figure 7 is a schematic diagram of the structure of a charge-discharge power distribution device provided in some embodiments of the present application. The charge-discharge power distribution device provided in the embodiments of the present application can be applied to charge-discharge power distribution equipment. As shown in Figure 7, the charge-discharge power distribution device in the embodiments of the present application may include: an acquisition module 701, a distribution module 702, and a control module 703.

[0188] The acquisition module 701 is used to obtain the total charge and discharge power allocated to each battery cluster in the energy storage device;

[0189] An allocation module 702 is configured to allocate the total charge and discharge power to obtain a sub-charge and discharge power allocated to each battery cluster, with the goal of optimizing the charge and discharge efficiency of each battery cluster of the energy storage device and balancing the number of cycles of each battery cluster.

[0190] The control module 703 is used to control each battery cluster to charge and discharge according to the sub-charge and discharge power allocated to each battery cluster.

[0191] In some embodiments, the allocation module 702 includes:

[0192] a division unit, configured to divide each battery cluster into at least one battery cluster group according to the SOC of each battery cluster; wherein different battery cluster groups have different charge and discharge priorities;

[0193] a determining unit, configured to determine, from the at least one battery cluster group, at least one target battery cluster group to be charged or discharged, and a target charge or discharge power corresponding to each target battery cluster group, based on the total charge or discharge power and the charge or discharge power limit corresponding to each battery cluster group;

[0194] an allocation unit for allocating target charge and discharge powers corresponding to the target battery cluster groups, with the optimal charge and discharge efficiency of each battery cluster in the target battery cluster group and the balanced number of cycles of each battery cluster as allocation targets, so as to obtain sub-charge and discharge powers allocated to each battery cluster in the target battery cluster group.

[0195] In some embodiments, the allocation unit includes:

[0196] an acquisition subunit, configured to acquire an objective function, wherein the objective function includes an imbalance degree portion and a charge and discharge power loss portion of historical charge and discharge capacities of each battery cluster in the target battery cluster group;

[0197] The solving subunit is used to solve the objective function based on preset constraints and with the goal of minimizing the value of the objective function, so as to obtain the sub-charging and discharging power allocated to each battery cluster in the target battery cluster group.

[0198] In some embodiments, the acquisition subunit is specifically configured to:

[0199] Obtaining an imbalance degree of historical charge and discharge capacity of each battery cluster in the target battery cluster group according to the historical total charge and discharge capacity and the corresponding sub-charge and discharge power of each battery cluster in the target battery cluster group;

[0200] The imbalance degree is obtained according to the energy storage system cost corresponding to the unit charge and discharge capacity and the imbalance degree of the historical charge and discharge capacity of each battery cluster in the target battery cluster group.

[0201] In some embodiments, the acquisition subunit is specifically configured to:

[0202] The charge and discharge power loss portion is obtained according to the electricity price corresponding to the unit power and the sub-charge and discharge power corresponding to each battery cluster in the target battery cluster group.

[0203] In some embodiments, the preset restriction conditions include: a first power restriction condition and a second power restriction condition; wherein the first power restriction condition is that the sum of the sub-charge and discharge powers corresponding to each battery cluster in the target battery cluster group is equal to the target charge and discharge power corresponding to the target battery cluster group; the second power restriction condition is that the sub-charge and discharge powers corresponding to each battery cluster in the target battery cluster group are within a preset sub-charge and discharge power restriction range.

[0204] In some embodiments, the determining unit is specifically configured to:

[0205] determining a first candidate battery cluster with the highest charge and discharge priority from at least one battery cluster group according to the total charge and discharge power;

[0206] If the absolute value of the charge and discharge power limit corresponding to the first candidate battery cluster is greater than the absolute value of the total charge and discharge power, the first candidate battery cluster is used as the target battery cluster group, and the total charge and discharge power is used as the target charge and discharge power corresponding to the target battery cluster group.

[0207] In some embodiments, the determining unit is further configured to:

[0208] If the absolute value of the charge and discharge power limit corresponding to the first candidate battery cluster is not greater than the absolute value of the total charge and discharge power, the first candidate battery cluster is used as the first target battery cluster group, and the charge and discharge power limit corresponding to the first candidate battery cluster is used as the target charge and discharge power corresponding to the first target battery cluster group;

[0209] determining a second candidate battery cluster having a second highest charge and discharge priority from the at least one battery cluster group;

[0210] If the absolute value of the charge and discharge power limit corresponding to the second candidate battery cluster is greater than the preset absolute value, the second candidate battery cluster is grouped as the second target battery cluster, and the difference between the total charge and discharge power and the charge and discharge power limit corresponding to the first candidate battery cluster is used as the target charge and discharge power corresponding to the second target battery cluster group; wherein the preset absolute value is the absolute value of the difference between the total charge and discharge power and the charge and discharge power limit corresponding to the first candidate battery cluster.

[0211] In some embodiments, the partitioning unit is specifically configured to:

[0212] Each battery cluster is divided into at least one battery cluster group according to the SOC of each battery cluster and a plurality of preset charge and discharge thresholds.

[0213] In some embodiments, the partitioning unit is specifically configured to:

[0214] Determining a plurality of target charge and discharge thresholds from a plurality of preset charge and discharge thresholds according to the total charge and discharge power;

[0215] Each battery cluster is divided into at least one battery cluster group according to the SOC of each battery cluster and a plurality of target charge and discharge thresholds.

[0216] In some embodiments, the acquisition module 701 is specifically configured to:

[0217] Get the power scheduling request value;

[0218] The total charge and discharge power is determined based on the power dispatch request value and the total power generation power of the power generation equipment.

[0219] In some embodiments, the control module 703 is specifically configured to:

[0220] For each battery cluster, the sub-charge and discharge power corresponding to the battery cluster is sent to the DC / DC corresponding to the battery cluster to control the charging and discharging of the DC / DC and the power grid.

[0221] The charging and discharging power distribution device for energy storage devices provided in the embodiments of the present application can be used to implement the technical solutions in the embodiments of the charging and discharging power distribution method for energy storage devices described above. The implementation principles and technical effects thereof are similar and will not be described in detail here.

[0222] Each module in the above-mentioned image processing device can be implemented in whole or in part through software, hardware, or a combination thereof. Each of the above-mentioned modules can be embedded in or independent of the processor in the charge-discharge power distribution device in hardware form, or can be stored in the memory of the charge-discharge power distribution device in software form, so that the processor can call and execute the corresponding operations of each of the above modules.

[0223] In some embodiments, Figure 8 is a structural diagram of the charge and discharge power distribution device in some embodiments of the present application. As shown in Figure 8, the charge and discharge power distribution device provided in the embodiment of the present application may include a processor, a memory and a communication interface connected via a system bus. Among them, the processor of the charge and discharge power distribution device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and computer program in the non-volatile storage medium. The communication interface of the charge and discharge power distribution device is used to communicate with external devices in a wired or wireless manner. The wireless manner can be achieved through WIFI, mobile cellular network, NFC (near field communication) or other technologies. When the computer program is executed by the processor to implement the technical solution in the embodiment of the charge and discharge power distribution method for the above-mentioned energy storage device of the present application, its implementation principle and technical effect are similar and will not be repeated here.

[0224] Those skilled in the art will understand that the structure shown in Figure 8 is merely a block diagram of a portion of the structure related to the solution of the present application, and does not constitute a limitation on the charging and discharging power distribution device to which the solution of the present application is applied. The specific charging and discharging power distribution device may include more or fewer components than shown in the figure, or combine certain components, or have a different component arrangement.

[0225] In some embodiments, a charging and discharging power distribution device for an energy storage device is also provided, including a memory and a processor. The memory stores a computer program. When the processor executes the computer program, the technical solution in the embodiment of the charging and discharging power distribution method for the energy storage device mentioned above in this application is implemented. The implementation principle and technical effect are similar and will not be repeated here.

[0226] In some embodiments, a computer-readable storage medium is further provided, on which a computer program is stored. When the computer program is executed by a processor, the technical solution in the embodiment of the charging and discharging power distribution method for the energy storage device mentioned above in this application is implemented. The implementation principle and technical effect are similar and will not be repeated here.

[0227] In some embodiments, a computer program product is also provided, including a computer program. When the computer program is executed by a processor, the technical solution in the embodiment of the charging and discharging power distribution method for the energy storage device mentioned above in this application is implemented. The implementation principle and technical effect are similar and will not be repeated here.

[0228] Those skilled in the art will appreciate that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, database or other media used in the embodiments provided in this application may include at least one of non-volatile and volatile memory. Non-volatile memory may include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory may include random access memory (RAM) or external cache memory, etc. For purposes of illustration and not limitation, RAM may be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The processors involved in the various embodiments provided herein may be general-purpose processors, central processing units (CPUs), graphics processors (GPUs), digital signal processors (DSPs), programmable logic devices (PLDs), data processing logic devices based on quantum computing, and the like, without limitation thereto.

[0229] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A method for distributing charging and discharging power of an energy storage device, wherein: The method comprises: Obtaining the total charge and discharge power allocated to each battery cluster in the energy storage device; The total charge and discharge power is distributed based on the optimal charge and discharge efficiency of each battery cluster of the energy storage device and the balanced number of cycles of each battery cluster, so as to obtain the sub-charge and discharge power allocated to each battery cluster; According to the sub-charging and discharging powers allocated to the battery clusters, the battery clusters are controlled to perform charging and discharging.

2. The method according to claim 1, wherein The allocating the total charge and discharge power based on the optimal charge and discharge efficiency of each battery cluster of the energy storage device and the balanced number of cycles of each battery cluster to obtain the sub-charge and discharge power allocated to each battery cluster includes: dividing the battery clusters into at least one battery cluster group according to the SOC of each battery cluster; wherein different battery cluster groups have different charging and discharging priorities; Determining at least one target battery cluster group to be charged or discharged, and a target charge or discharge power corresponding to each target battery cluster group, from the at least one battery cluster group, according to the total charge or discharge power and the charge or discharge power limit corresponding to each battery cluster group; For each of the target battery cluster groups, the target charge and discharge power corresponding to the target battery cluster group is allocated with the optimal charge and discharge efficiency of each battery cluster in the target battery cluster group and the balanced number of cycles of each battery cluster as the allocation target, so as to obtain the sub-charge and discharge power allocated to each battery cluster in the target battery cluster group.

3. The method according to claim 2, wherein: The target charge and discharge power corresponding to the target battery cluster group is allocated based on the optimal charge and discharge efficiency of each battery cluster in the target battery cluster group and the balanced number of cycles of each battery cluster, so as to obtain the sub-charge and discharge power allocated to each battery cluster in the target battery cluster group, including: Obtaining an objective function, wherein the objective function includes an imbalance portion and a charge and discharge power loss portion of historical charge and discharge capacities of each battery cluster in the target battery cluster group; Based on preset constraints and with the goal of minimizing the value of the objective function, the objective function is solved to obtain the sub-charging and discharging powers allocated to each battery cluster in the target battery cluster group.

4. The method according to claim 3, wherein: Obtaining the imbalance degree of the historical charge and discharge capacity of each battery cluster in the target battery cluster group includes: Obtaining an imbalance degree of historical charge and discharge capacity of each battery cluster in the target battery cluster group according to the historical total charge and discharge capacity and the corresponding sub-charge and discharge power of each battery cluster in the target battery cluster group; The imbalance part is obtained according to the energy storage system cost corresponding to the unit charge and discharge capacity and the imbalance of the historical charge and discharge capacity of each battery cluster in the target battery cluster group.

5. The method according to claim 3 or 4, wherein: Obtaining the charge and discharge power loss portion of each battery cluster in the target battery cluster group includes: The charge and discharge power loss portion is obtained according to the electricity price corresponding to the unit power and the sub-charge and discharge power corresponding to each battery cluster in the target battery cluster group.

6. The method according to any one of claims 3 to 5, wherein: The preset restriction conditions include: a first power restriction condition and a second power restriction condition; wherein, the first power restriction condition is that the sum of the sub-charge and discharge powers corresponding to each battery cluster in the target battery cluster group is equal to the target charge and discharge power corresponding to the target battery cluster group; the second power restriction condition is that the sub-charge and discharge power is within a preset sub-charge and discharge power restriction range.

7. The method according to any one of claims 2 to 6, wherein The determining, from the at least one battery cluster group, at least one target battery cluster group that needs to be charged and discharged, and the target charge and discharge power corresponding to each target battery cluster group according to the total charge and discharge power and the charge and discharge power limit corresponding to each battery cluster group, includes: determining a first candidate battery cluster with the highest charge and discharge priority from the at least one battery cluster group according to the total charge and discharge power; If the absolute value of the charge and discharge power limit corresponding to the first candidate battery cluster is greater than the absolute value of the total charge and discharge power, the first candidate battery cluster is used as the target battery cluster group, and the total charge and discharge power is used as the target charge and discharge power corresponding to the target battery cluster group.

8. The method according to claim 7, wherein: The method further includes determining, from the at least one battery cluster group, at least one target battery cluster group that needs to be charged or discharged, and a target charge or discharge power corresponding to each target battery cluster group based on the total charge or discharge power and the charge or discharge power limit corresponding to each battery cluster group. If the absolute value of the charge and discharge power limit corresponding to the first candidate battery cluster is not greater than the absolute value of the total charge and discharge power, the first candidate battery cluster is used as a first target battery cluster group, and the charge and discharge power limit corresponding to the first candidate battery cluster is used as a target charge and discharge power corresponding to the first target battery cluster group; determining a second candidate battery cluster having a second highest charge and discharge priority from the at least one battery cluster group; If the absolute value of the charge and discharge power limit corresponding to the second candidate battery cluster is greater than a preset absolute value, the second candidate battery cluster is grouped as a second target battery cluster, and the difference between the total charge and discharge power and the charge and discharge power limit corresponding to the first candidate battery cluster is used as the target charge and discharge power corresponding to the second target battery cluster group; wherein the preset absolute value is the absolute value of the difference between the total charge and discharge power and the charge and discharge power limit corresponding to the first candidate battery cluster.

9. The method according to any one of claims 2 to 8, wherein The dividing the battery clusters into at least one battery cluster group according to the SOC of the battery clusters includes: The battery clusters are divided into at least one battery cluster group according to the SOC of the battery clusters and a plurality of preset charge and discharge thresholds.

10. The method according to claim 9, wherein: The dividing the battery clusters into at least one battery cluster group according to the SOC of each battery cluster and a plurality of preset charge and discharge thresholds includes: determining a plurality of target charge and discharge thresholds from the plurality of preset charge and discharge thresholds according to the total charge and discharge power; The battery clusters are divided into at least one battery cluster group according to the SOC of the battery clusters and the plurality of target charge and discharge thresholds.

11. The method according to any one of claims 1 to 10, wherein The obtaining of the total charge and discharge power allocated to each battery cluster in the energy storage device includes: Get the power scheduling request value; The total charge and discharge power is determined according to the power scheduling request value and the total power generation power of the power generation equipment.

12. The method according to any one of claims 1 to 10, wherein The controlling the charging and discharging of each battery cluster according to the sub-charging and discharging powers allocated to each battery cluster includes: For each of the battery clusters, the sub-charging and discharging power corresponding to the battery cluster is sent to the DC / DC corresponding to the battery cluster, so as to control the DC / DC to perform charging and discharging with the power grid.

13. A charging and discharging power distribution device for an energy storage device, wherein: The device comprises: an acquisition module, configured to acquire the total charge and discharge power allocated to each battery cluster in the energy storage device; an allocation module, configured to allocate the total charge and discharge power based on the optimization of the charge and discharge efficiency of each battery cluster of the energy storage device and the balance of the number of cycles of each battery cluster, so as to obtain a sub-charge and discharge power allocated to each battery cluster; The control module is used to control the charging and discharging of each battery cluster according to the sub-charging and discharging powers allocated to each battery cluster.

14. A charging and discharging power distribution device for an energy storage device, comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 12 are implemented.

15. A computer-readable storage medium having a computer program stored thereon, wherein: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 12 are implemented.

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