Power distribution method for energy storage cabinet and related device

Abstract

The application discloses a power distribution method of an energy storage cabinet and related devices, and the method comprises the following steps: acquiring the distributable power of an energy storage system, the first power of a plurality of energy storage cabinets and the battery state of charge of the plurality of energy storage cabinets, wherein the first power is the operating power of the corresponding energy storage cabinet at the optimal energy efficiency ratio; determining the power distribution mode of the energy storage system according to the distributable power of the energy storage system, the first power of the plurality of energy storage cabinets and the battery state of charge of the plurality of energy storage cabinets, wherein the power distribution mode comprises a first mode and a second mode, the first mode represents that the power distribution is preferentially satisfied with the operation of the plurality of energy storage cabinets according to the first power, and the second mode represents that the power distribution is preferentially satisfied with the similar battery state of charge of the plurality of energy storage cabinets. Through the implementation of the steps in the method, the problem of low energy storage system operation efficiency is solved.

Description

Technical Field

[0001] This invention relates to the field of energy storage equipment technology, and in particular to a power distribution method and related apparatus for an energy storage cabinet. Background Technology

[0002] An energy storage system typically includes multiple energy storage cabinets, multiple electrical devices, and an energy management device that controls the energy storage cabinets. When the input from the external power grid is sufficient to power the electrical devices in the system, the energy management device controls the multiple energy storage cabinets to charge and store excess electrical energy from the external power grid. When the electrical energy from the external power grid is insufficient to power the electrical devices in the system, the energy management device discharges the multiple energy storage cabinets to supply power to the devices. Furthermore, the energy management system can also control the energy storage cabinets to discharge and input electrical energy into the external power grid, thus selling the stored electrical energy to the external grid.

[0003] In energy storage systems, due to the different operating parameters allocated to the energy storage cabinets or the different internal structures of multiple energy storage cabinets, multiple energy storage cabinets usually operate under different operating states and operating parameters. This results in multiple energy storage cabinets in an energy storage system possibly being in different battery charge states at the same time.

[0004] In the operational logic of related technologies, energy storage systems typically use energy management devices to determine the total charging or discharging power that can be allocated to all energy storage cabinets in the current energy storage system based on circuit information (such as the number and power of energy storage cabinets, the power of other electrical appliances, and the circuit protection current in the energy storage system). Then, the total charging or discharging power is evenly distributed to each energy storage cabinet. Regardless of whether multiple energy storage cabinets are charging or discharging, each energy storage cabinet will operate at the same power. If multiple energy storage cabinets are in different states of charge at the start of operation, some energy storage cabinets will finish charging or discharging faster than other energy storage cabinets due to their higher or lower states of charge at the start of operation, thus stopping operation. This results in some energy storage cabinets in the energy storage system stopping operation prematurely, causing power wastage, extending the charging and discharging time of the entire power station, and leading to low operating efficiency of the energy storage system. Summary of the Invention

[0005] To address the aforementioned issues, this application provides a power distribution method and related apparatus for an energy storage cabinet. The solution proposed in this application helps to solve the problem of low operating efficiency of energy storage systems.

[0006] To achieve the above objectives, in a first aspect, embodiments of this application provide a power allocation method for an energy storage cabinet, characterized in that an energy management device is applied to an energy storage system, the energy management system being used to manage multiple energy storage cabinets in the energy storage system, the method comprising: acquiring the allocatable power of the energy storage system, the first power of the multiple energy storage cabinets, and the battery state of charge of the multiple energy storage cabinets, wherein the first power is the operating power of the corresponding energy storage cabinet at the optimal energy efficiency ratio; determining a power allocation mode of the energy storage system based on the allocatable power of the energy storage system, the first power of the multiple energy storage cabinets, and the battery state of charge of the multiple energy storage cabinets, wherein the power allocation mode includes a first mode and a second mode, wherein the first mode indicates that the power allocation prioritizes satisfying the multiple energy storage cabinets operating at the first power, and the second mode indicates that the power allocation prioritizes satisfying the multiple energy storage cabinets being in similar battery state of charge.

[0007] As can be seen, in this embodiment, when multiple energy storage cabinets meet the preconditions, the power of the multiple energy storage cabinets is allocated according to the first mode, which avoids the problem that the energy storage system cannot maintain the maximum operating power for a long time and also improves the efficiency of the energy storage system. When the preconditions are not met, the power is allocated according to the second mode, which makes the multiple energy storage cabinets prioritize being in a similar state of remaining energy, so that the energy storage system can operate at the maximum output power for a longer time, thus solving the problem of low operating efficiency of the energy storage system.

[0008] In conjunction with the first aspect, in one possible embodiment, determining the power allocation mode of the energy storage system based on the allocatable power of the energy storage system, the first power of multiple energy storage cabinets, and the battery state of charge (SBC) of the multiple energy storage cabinets includes: obtaining the second power of the multiple energy storage cabinets, where the second power is the rated operating power of the corresponding energy storage cabinet; calculating the maximum operating power of the energy storage system based on the second power of the multiple energy storage cabinets; determining the expected SBC of the multiple energy storage cabinets after operating at the first power for a preset time; if the allocatable power is less than the maximum operating power, and the expected SBC of each of the multiple energy storage cabinets is less than a first preset threshold and greater than a second preset threshold, then the power allocation mode of the energy storage system is determined to be a first mode, where the first preset threshold is greater than the second preset threshold; if the allocatable power is less than the maximum operating power, and the expected SBC of each of the multiple energy storage cabinets is not all less than the first preset threshold or not all greater than the second preset threshold, then the power allocation mode of the energy storage system is determined to be a second mode.

[0009] As can be seen, in the application embodiment, multiple data such as the allocable power, the first power of multiple energy storage cabinets, and the battery state of charge of multiple energy storage cabinets are used to determine whether any of the multiple energy storage cabinets have reached the state of being fully charged or fully discharged, thereby improving the reliability of the judgment result and avoiding the problem that multiple energy storage cabinets cannot simultaneously reach the state of being fully charged and fully discharged when the power allocation is determined by the first mode.

[0010] In conjunction with the first aspect, in one possible embodiment, before calculating the maximum operating power of the energy storage system based on the first power of the multiple energy storage cabinets, the method further includes: acquiring operating status data of the multiple energy storage cabinets, the operating status data including at least one of the health status of the corresponding energy storage cabinet, ambient temperature, and battery state of charge; analyzing the operating status data of the multiple energy storage cabinets to obtain the operating status of the multiple energy storage cabinets; if the operating status of an energy storage cabinet is an alarm state, then determining the first power and allocated power of the corresponding energy storage cabinet as a preset power.

[0011] As can be seen in this embodiment, the energy storage cabinet is determined to be in an alarm state based on its operating status. When the energy storage cabinet is in an alarm state, the corresponding energy storage cabinet is made to operate at a safe preset power or stop operating, thereby ensuring the safe operation of the energy storage cabinet.

[0012] In conjunction with the first aspect, in one possible embodiment, if the power allocation mode is determined to be a first mode, the method further includes: obtaining the operating mode of the energy storage system, wherein the operating mode is a charging mode or a discharging mode; if the operating mode is a charging mode, determining the energy storage cabinet with the smallest corresponding battery state of charge among multiple energy storage cabinets whose allocated power is not determined as the first target energy storage cabinet; if the operating mode is a discharging mode, determining the energy storage cabinet with the largest corresponding battery state of charge among multiple energy storage cabinets whose allocated power is not determined as the first target energy storage cabinet; if the allocatable power is greater than the first power of the first target energy storage cabinet, determining the first power of the first target energy storage cabinet as the allocated power of the first target energy storage cabinet; determining the difference between the allocatable power and the first power of the first target energy storage cabinet as the new allocatable power; repeating the above steps until the allocatable power is not greater than the first power of the first target energy storage cabinet; and determining the allocatable power as the allocated power of the first target energy storage cabinet.

[0013] As can be seen, in this embodiment of the application, the allocatable power is allocated to multiple energy storage cabinets so that most of the energy storage cabinets allocated power can operate at the corresponding first power, so that the energy storage cabinets allocated power can operate at the optimal energy efficiency ratio, thereby improving the operating efficiency of multiple energy storage cabinets. At the same time, in the discharge state, the energy storage cabinet with the larger energy state is given priority to discharge, and in the charging state, the energy storage cabinet with the smaller energy state is given priority to charge, so that the energy state of multiple energy storage cabinets is kept at a similar level as much as possible.

[0014] In conjunction with the first aspect, in one possible embodiment, if the power allocation mode is determined to be the second mode, the method further includes: obtaining the operating mode of the energy storage system, wherein the operating mode is a charging mode or a discharging mode; identifying the energy storage cabinets among the plurality of energy storage cabinets whose allocated power has not been determined as second target energy storage cabinets; obtaining the second power of at least one second target energy storage cabinet, wherein the second power is the rated operating power of the corresponding energy storage cabinet; determining the power allocation ratio of each of the at least one second target energy storage cabinets based on the allocable power, the operating mode, and the battery state of charge of at least one second energy storage cabinet; and merging the power allocation ratio of the second target energy storage cabinets with the allocable power. The product of the two values ​​is determined as the ideal allocated power of the corresponding second target energy storage cabinet; if the ideal allocated power of the second target energy storage cabinet is greater than the second power of the corresponding second target energy storage cabinet, then the second power is determined as the allocated power of the corresponding second target energy storage cabinet; the difference between the allocable power and all determined allocated power is determined as the new allocable power, and the above steps are repeated until the ideal allocated power is no greater than the second power of the corresponding second target energy storage cabinet; if the ideal allocated power of the second target energy storage cabinet is no greater than the second power of the corresponding second target energy storage cabinet, then the ideal allocated power of the second target energy storage cabinet is determined as the allocated power of the second target energy storage cabinet.

[0015] As can be seen, in this embodiment of the application, the power allocation of the energy storage cabinet is determined proportionally by the battery state of charge of multiple energy storage cabinets, so that the energy storage cabinets work at the allocated power, which solves the problem that the energy storage system cannot maintain maximum power operation for a long time due to individual energy storage cabinets quickly entering the fully charged state or fully discharged state.

[0016] In conjunction with the first aspect, in one possible embodiment, before obtaining the allocatable power of the energy storage system, the first power of the multiple energy storage cabinets, and the battery state of charge of the multiple energy storage cabinets, the method further includes: obtaining the correspondence between the operating status data of the multiple energy storage cabinets and the first power; obtaining the operating status data of the multiple energy storage cabinets, the operating status data including at least one of the health status of the corresponding energy storage cabinet, ambient temperature, and battery state of charge; and determining the first power of the multiple energy storage cabinets based on the operating status data of each of the multiple energy storage cabinets and the correspondence between the operating status data and the first power.

[0017] As can be seen, in this embodiment of the application, the first power of each energy storage cabinet under the current real-time operating status data is determined according to the correspondence between the operating status data of the energy storage cabinet and the first power, thereby improving the reliability of the first power of the energy storage cabinet and thus improving the efficiency of the energy storage cabinet operating under the first power.

[0018] In conjunction with the first aspect, in one possible embodiment, after determining the allocated power of the multiple energy storage cabinets, the method further includes: controlling the multiple energy storage cabinets to operate according to the corresponding allocated power; after the multiple energy storage cabinets have operated according to the corresponding allocated power for a preset time, obtaining the actual energy consumption ratio of a third target energy storage cabinet, wherein the third target energy storage cabinet is the energy storage cabinet among the multiple energy storage cabinets whose allocated power is the corresponding first power; determining the theoretical energy consumption ratio of the third target energy storage cabinet based on the first power of the third target energy storage cabinet; and determining the operating state of the third target energy storage cabinet as an alarm state if the difference between the actual energy consumption ratio and the theoretical energy consumption ratio of the third target energy storage cabinet is greater than a preset difference.

[0019] As can be seen from the embodiments of this application, the actual energy consumption ratio and theoretical energy consumption ratio of the energy storage cabinet are obtained to determine whether the energy storage cabinet is operating normally. When the difference between the actual energy consumption ratio and the theoretical energy consumption ratio is greater than a preset difference, it is determined that the corresponding energy storage cabinet has not experienced an operational fault. In this way, when the detection device of the corresponding energy storage cabinet fails and cannot properly determine the operating status of the energy storage cabinet, the operational fault of the energy storage cabinet can be detected in a timely manner, thereby further ensuring the operational safety of the energy storage system.

[0020] Secondly, embodiments of this application provide an energy management device for executing a power distribution method for energy storage cabinets. The energy management device belongs to an energy storage system and is used to manage multiple energy storage cabinets within the system. The device includes:

[0021] The acquisition unit is used to acquire the allocable power of the energy storage system, the first power of the plurality of energy storage cabinets and the battery state of charge of the plurality of energy storage cabinets, wherein the first power is the operating power of the corresponding energy storage cabinet at the optimal energy efficiency ratio.

[0022] The determining unit is configured to determine the power allocation mode of the energy storage system based on the allocable power of the energy storage system, the first power of the plurality of energy storage cabinets, and the battery state of charge of the plurality of energy storage cabinets. The power allocation mode includes a first mode and a second mode. The first mode indicates that the power allocation prioritizes the plurality of energy storage cabinets operating at the first power, and the second mode indicates that the power allocation prioritizes the plurality of energy storage cabinets being in a similar battery state of charge.

[0023] Thirdly, embodiments of this application provide an electronic device including a processor, a memory, a communication interface, and one or more programs. The one or more computer programs are stored in the memory and configured to be executed by the processor. The one or more computer programs are used to perform part or all of the method as described in the first aspect.

[0024] Fourthly, embodiments of this application provide a computer-readable storage medium storing a computer program for electronic data interchange, wherein the computer program causes a processor to perform part or all of the method as described in the first aspect.

[0025] Fifthly, this application provides a computer program product that, when read and executed by a computer, causes the computer to perform any of the possible design methods of the first aspect described above.

[0026] It is understood that the beneficial effects of the embodiments of the second to fifth aspects can be referred to the beneficial effects of the method of the first aspect, and will not be repeated here. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 A schematic diagram illustrating an application scenario of a power distribution method for an energy storage cabinet provided in an embodiment of this application;

[0029] Figure 2 This is a schematic diagram of the structure of an energy storage cabinet provided in an embodiment of this application;

[0030] Figure 3 A schematic flowchart illustrating a power distribution method for an energy storage cabinet provided in an embodiment of this application;

[0031] Figure 4 A schematic diagram illustrating a process for determining the allocation of energy storage cabinets according to a first mode, provided as an embodiment of this application;

[0032] Figure 5 A schematic diagram illustrating a process for determining the allocation of energy storage cabinets according to a second mode, provided as an embodiment of this application;

[0033] Figure 6 This application provides an embodiment of a schematic diagram illustrating information about multiple energy storage cabinets with the same state of charge.

[0034] Figure 7 This application provides an embodiment of a schematic diagram illustrating information about multiple energy storage cabinets with different states of battery charge.

[0035] Figure 8 This is a schematic diagram of the structure of an energy management device provided in an embodiment of this application;

[0036] Figure 9 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Detailed Implementation

[0037] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0038] The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or apparatuses.

[0039] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0040] The embodiments of this application will now be described with reference to the accompanying drawings.

[0041] Please see Figure 1 , Figure 1 This is a schematic diagram illustrating an application scenario of a power distribution method for an energy storage cabinet provided in an embodiment of this application. Application scenario 100 includes an energy management device 101 and multiple energy storage cabinets 102. Both the energy management device 101 and the multiple energy storage cabinets 102 belong to an energy storage system, which manages the energy storage cabinets 102 in a microgrid. Figure 1The electrical appliances not shown are not included in the diagram. The microgrid is also connected to the external power grid. The energy storage system controls multiple energy storage cabinets 102 to switch between charging and discharging states via an energy management device 101. When there is power input from the external power grid, the energy management device 101, based on the power consumption of other electrical appliances in the energy storage system, controls the multiple energy storage cabinets 102 to charge, storing excess input power from the external power grid in the cabinets 102, while ensuring the normal power needs of these appliances. When the power from the external power grid is insufficient to meet the normal power needs of other electrical appliances, or when it is necessary to release the energy from the multiple energy storage cabinets 102 to the external power grid, the energy management device 101 controls the multiple energy storage cabinets 102 to discharge, releasing the stored energy to the electrical equipment or the external power grid, thereby achieving power interaction between the microgrid and the external power grid.

[0042] The energy management device 101 here is specifically an Energy Management System (EMS) used to control multiple energy storage cabinets 102 in the energy storage system. These energy storage cabinets 102 are used to store excess electrical energy in the energy storage system, as well as electrical energy released by appliances in the energy storage system or the power grid. In practical applications, there may be more or fewer energy storage cabinets 102; only the case of three energy storage cabinets 102 is shown here.

[0043] Please see Figure 2 , Figure 2 This is a schematic diagram of the structure of an energy storage cabinet provided in an embodiment of this application, wherein the energy storage cabinet 102 is specifically... Figure 1 This refers to any one of the multiple energy storage cabinets 102 shown. Each energy storage cabinet 102 includes multiple battery clusters 1021 connected in series or parallel and a power conversion system (PCS) 1022. For clarity, only three parallel battery clusters 1021 are shown here. Furthermore, each battery cluster 1021 includes multiple battery packs, and each battery pack includes multiple individual battery cells. Different energy storage cabinets 102 may have different capacity, rated power, and other operating parameters due to differences in the specifications and quantities of the power conversion system 1022, battery clusters 1021, battery packs, and individual battery cells used within them. The power conversion system 1022 receives operating status and operating power data from the energy management device and controls the operation of the battery clusters 1021 in the energy storage cabinet 102 to achieve charging and discharging functions.

[0044] In this embodiment, the energy management device 101 acquires the allocatable power of the energy storage system, the first power of multiple energy storage cabinets 102, and the state of charge (SBC) of the batteries in the multiple energy storage cabinets 102. The first power is the operating power of the corresponding energy storage cabinet at its optimal energy efficiency ratio. The allocatable power is specifically the maximum charging or discharging power supported by the entire energy storage system; the first power specifically includes the charging and discharging power of the corresponding energy storage cabinet 102 at its optimal energy efficiency ratio. The SBC is the ratio of the currently stored electrical energy to the maximum stored electrical energy in the corresponding energy storage cabinet, specifically values ​​such as 10%, 30%, and 50%.

[0045] The allocatable power here is specifically calculated by the energy management device 101 through the following process: First, the energy management device 101 calculates the total power that the energy storage system can provide by acquiring the current and voltage provided by the power grid in the energy storage system in real time. Then, the energy management device 101 acquires the total power of all other electrical devices in the energy storage system, and subtracts the total power of all other electrical devices from the total power that the energy storage system can provide as the remaining power. Finally, it determines the equipment information, operating status, and protection current of the circuits in the current energy storage system for all energy storage cabinets. Based on the above information and the remaining power, the allocatable power of the energy storage system is determined. In other words, the allocatable power here is specifically the maximum value of the sum of the power of all energy storage cabinets, provided that other electrical devices in the energy storage system operate normally and the current carried by the circuits in the energy storage system does not exceed the corresponding protection current.

[0046] The first power here is specifically determined by the energy management device 101 by obtaining equipment information such as the model of the corresponding energy storage cabinet 102 and querying the correspondence between the equipment information and the first power. Alternatively, the first power is stored in the corresponding energy storage cabinet 102, and the energy management device 101 obtains it by communicating with the energy storage cabinet 102.

[0047] The specific state of charge of the batteries in each energy storage cabinet is obtained in real time by the energy management device 101 from the corresponding energy storage cabinet 102.

[0048] The energy management device 101 determines the power allocation mode of the energy storage system based on the allocable power of the energy storage system, the first power of multiple energy storage cabinets, and the state of charge (SOC) of the batteries in the multiple energy storage cabinets. The power allocation mode includes a first mode and a second mode. The first mode prioritizes power allocation to ensure that multiple energy storage cabinets operate at the first power, while the second mode prioritizes power allocation to ensure that multiple energy storage cabinets are in similar SOC states. Specifically, the energy management device determines whether, after a preset period of operation at the first power, any individual energy storage cabinet in the energy storage system will reach a state of complete charging or discharging. If no individual energy storage cabinet reaches a state of complete charging or discharging, power allocation is performed according to the first mode; otherwise, power allocation is performed according to the first mode.

[0049] As can be seen, in this embodiment of the application, when multiple energy storage cabinets meet the preconditions, the power of the multiple energy storage cabinets is allocated according to the first mode, which avoids the multiple energy storage cabinets being unable to reach the state of being fully charged and fully discharged at the same time, and also improves the efficiency of the energy storage system. When the preconditions are not met, the power is allocated according to the second mode, so that the multiple energy storage cabinets are in a similar state of remaining energy, thereby enabling the energy storage system to operate at maximum output power for a longer time.

[0050] Please see Figure 3 , Figure 3 This application provides a schematic flowchart of a power distribution method for an energy storage cabinet, which can be based on... Figure 1 The application scenarios shown are implemented as follows: Figure 3 As shown, it includes steps S301-S302.

[0051] S301: Obtain the allocatable power of the energy storage system, the first power of multiple energy storage cabinets, and the battery state of charge of multiple energy storage cabinets. The first power is the operating power of the corresponding energy storage cabinet at the optimal energy efficiency ratio.

[0052] Specifically, the allocable power here refers to the charging or discharging power that the energy storage system needs to allocate to multiple energy storage units, which can be determined by the energy management device. The first power here is the charging or discharging power corresponding to the optimal energy efficiency ratio of the corresponding energy storage unit. The battery state of charge here is the ratio of the current stored energy to the maximum stored energy of the corresponding energy storage unit.

[0053] The data such as allocable power, initial power, and battery state of charge are acquired and determined in real time by the energy management device.

[0054] S302: Determine the power allocation mode of the energy storage system based on the allocable power of the energy storage system, the first power of multiple energy storage cabinets, and the battery state of charge of multiple energy storage cabinets. The power allocation mode includes a first mode and a second mode. The first mode indicates that the power allocation prioritizes the operation of multiple energy storage cabinets at the first power, and the second mode indicates that the power allocation prioritizes the operation of multiple energy storage cabinets at similar battery state of charge.

[0055] Specifically, the energy management device determines the power allocation mode of the energy storage system based on the first power of the multiple energy storage cabinets and the state of charge of the batteries in the multiple energy storage cabinets.

[0056] If multiple energy storage cabinets have been operating at the first power for a preset time, and none of them have reached the state of being fully charged or fully discharged, then the available power will be allocated by prioritizing the first mode in which the multiple energy storage cabinets operate at the first power. The preset time here is either a fixed time set in advance or the energy storage system will be in a charging or discharging state for the preset time.

[0057] If, after multiple energy storage cabinets have operated at the first power for a preset time, none of the energy storage cabinets have reached the state of being fully charged or fully discharged, then the available power is allocated by prioritizing the second mode, which prioritizes the multiple energy storage cabinets being in a similar state of battery charge.

[0058] In one possible embodiment, the power allocation mode of the energy storage system is determined based on the allocatable power of the energy storage system, the first power of multiple energy storage cabinets, and the state of charge (SBC) of the batteries in the multiple energy storage cabinets. This includes: calculating the maximum operating power of the energy storage system based on the first power of the multiple energy storage cabinets; determining the expected SBC of the batteries in the multiple energy storage cabinets after operating at the first power for a preset time; if the allocatable power is less than the maximum operating power, and the expected SBC of each of the multiple energy storage cabinets is less than a first preset threshold and greater than a second preset threshold, then the power allocation mode of the energy storage system is determined to be a first mode, where the first preset threshold is greater than the second preset threshold; if the allocatable power is less than the maximum operating power, and the expected SBC of each of the multiple energy storage cabinets is not all less than the first preset threshold or not all greater than the second preset threshold, then the power allocation mode of the energy storage system is determined to be a second mode.

[0059] Specifically, for the first power, the energy storage cabinet has the best energy efficiency ratio when it operates at the first power. Therefore, if the energy storage cabinet operates at the first power, it will achieve the best energy efficiency ratio, thus making the operation of the energy storage cabinet the most efficient.

[0060] The second power refers to the rated power of the corresponding energy storage cabinet, including the rated charging power and the rated discharging power. When the allocable power of the energy storage system is greater than or equal to the sum of the second powers of the multiple energy storage cabinets, in order to ensure that the actual operating power of the energy storage system meets the allocable power, the multiple energy storage cabinets are directly controlled to operate according to the corresponding second power.

[0061] In the embodiments of this application, the energy management device calculates the maximum operating power of the energy storage system based on the first power of multiple energy storage cabinets; and the state of charge of the battery of each energy storage cabinet after operating at the corresponding first power for a preset time. For example, if the state of charge of the battery of the energy storage cabinet is 50%, and the energy management device requires it to discharge, the state of charge of the battery is expected to be 30% after operating at the first power for a preset time.

[0062] If the allocable power is less than the maximum operating power, and the expected state of charge (SOC) of each of the multiple energy storage cabinets is less than a first preset threshold and greater than a second preset threshold (where the first and second preset thresholds are both SOCs), and if the expected SOC of all energy storage cabinets after operating for a first preset duration is between the first and second preset thresholds (meaning the energy storage cabinets will not reach a fully charged or fully discharged state), then the power allocation mode of the energy storage system is determined to be the first mode, causing the multiple energy storage cabinets to operate at the first power.

[0063] If the allocable power is less than the maximum operating power, and the expected state of charge of each energy storage cabinet in the multiple energy storage cabinets is not less than the first preset threshold or not greater than the second preset threshold, that is, if the multiple energy storage cabinets operate at the corresponding first power, some energy storage cabinets may reach the state of being fully charged and fully discharged in advance, resulting in some energy storage cabinets in the energy storage system being discharged or fully charged first. Therefore, the power allocation mode of the energy storage system is determined to be the second mode.

[0064] As can be seen, in this embodiment, when multiple energy storage cabinets meet the preconditions, the power of the multiple energy storage cabinets is allocated according to the first mode, which avoids the problem that the energy storage system cannot maintain the maximum operating power for a long time and also improves the efficiency of the energy storage system. When the preconditions are not met, the power is allocated according to the second mode, which makes the multiple energy storage cabinets prioritize being in a similar state of remaining energy, so that the energy storage system can operate at the maximum output power for a longer time, thus solving the problem of low operating efficiency of the energy storage system.

[0065] In one possible embodiment, before calculating the maximum operating power of the energy storage system based on the first power of the multiple energy storage cabinets, the method further includes: acquiring operating status data of the multiple energy storage cabinets, the operating status data including at least one of the health status of the corresponding energy storage cabinet, ambient temperature, and battery state of charge; analyzing the operating status data of the multiple energy storage cabinets to obtain the operating status of the multiple energy storage cabinets; if the operating status of an energy storage cabinet is an alarm state, then determining the first power and allocated power of the corresponding energy storage cabinet as a preset power.

[0066] Specifically, in the embodiments of this application, the energy storage cabinet has multiple operating states. Here, the operating state is used to indicate the health status of the corresponding energy storage cabinet. Specifically, it can be calculated based on the operating state data of the energy storage cabinet. The operating state data specifically includes at least one of the following: the health status of the energy storage cabinet, the ambient temperature, and the state of charge of the battery.

[0067] When the energy storage cabinet is in good operating condition, the probability of it overheating, unstable voltage, or other faults during operation is low.

[0068] When the energy storage cabinet is in normal operating condition, it is in a normal operating state. The probability of the energy storage cabinet experiencing faults such as overheating or voltage instability during operation is slightly higher than that of the energy storage cabinet in good condition.

[0069] When the energy storage cabinet is in poor operating condition, it is in an alarm state. The probability of the energy storage cabinet overheating, unstable voltage, and other faults during operation is relatively high.

[0070] The energy management device determines the operating status of the energy storage cabinet based on its operational status data. When the energy storage cabinet is in an alarm state, the device sets the primary power and allocated power of the corresponding energy storage cabinet to the preset power. This preset power is 0 or a low power to ensure that the corresponding energy storage cabinet does not experience overheating, voltage instability, or other faults.

[0071] As can be seen in this embodiment, the energy storage cabinet is determined to be in an alarm state based on its operating status. When the energy storage cabinet is in an alarm state, the corresponding energy storage cabinet is made to operate at a safe preset power or stop operating, thereby ensuring the safe operation of the energy storage cabinet.

[0072] In one possible embodiment, if the power allocation mode is determined to be a first mode, the method further includes: obtaining the operating mode of the energy storage system, wherein the operating mode is a charging mode or a discharging mode; if the operating mode is a charging mode, determining the energy storage cabinet with the smallest corresponding battery state of charge among multiple energy storage cabinets whose allocated power is not determined as the first target energy storage cabinet; if the operating mode is a discharging mode, determining the energy storage cabinet with the largest corresponding battery state of charge among multiple energy storage cabinets whose allocated power is not determined as the first target energy storage cabinet; if the allocable power is greater than the first power of the first target energy storage cabinet, determining the first power of the first target energy storage cabinet as the allocated power of the first target energy storage cabinet; determining the difference between the allocable power and the first power of the first target energy storage cabinet as the new allocable power; repeating the above steps until the allocable power is not greater than the first power of the first target energy storage cabinet; and determining the allocable power as the allocated power of the first target energy storage cabinet.

[0073] Specifically, in the embodiments of this application, the energy management device performs power allocation through a first mode. In the first mode, more energy storage cabinets are preferentially operated at the corresponding first power, so that the energy efficiency conversion ratio of the energy storage cabinets operating at the first power is the highest.

[0074] Please see Figure 4 , Figure 4 This is a schematic diagram illustrating a process for determining the allocation of energy storage cabinets according to a first mode, as provided in an embodiment of this application. Figure 4 The energy management system shown first determines the operating mode of the energy storage system, which is either charging mode or discharging mode. In charging mode, the allocatable power is the total charging power that the multiple energy storage units of the energy storage system can obtain. In discharging mode, the allocatable power is the total discharging power that the multiple energy storage units of the energy storage system need to meet.

[0075] In charging mode, the energy management device identifies the energy storage cabinet with the lowest battery state of charge among multiple energy storage cabinets as the first target battery, and thus prioritizes allocating the available power to the energy storage cabinet with the lowest battery state of charge. When the available power is insufficient to meet the first power requirements of all energy storage cabinets, the energy storage cabinet with the lower battery state of charge is prioritized for charging, thereby keeping the battery state of charge of multiple energy storage cabinets at the same level.

[0076] In discharge mode, the energy management device identifies the energy storage cabinet with the largest battery state of charge among multiple energy storage cabinets as the first target battery, and thus prioritizes allocating the available power to the energy storage cabinet with the largest battery state of charge. When the available power is insufficient to meet the first power requirements of all energy storage cabinets, the energy storage cabinet with the larger battery state of charge is prioritized to discharge, thereby keeping the battery state of charge of multiple energy storage cabinets at the same level.

[0077] After identifying the first target energy storage unit, determine whether the allocable power is greater than the first power of the first target energy storage unit.

[0078] If the allocable power is greater than the first power of the first target energy storage unit, then the first power of the first target energy storage unit is determined as the allocated power of the first target energy storage unit. That is, a portion of the allocable power is allocated to the first target energy storage unit so that it can operate at the power indicated by the first power. Therefore, the total value of the allocable power is reduced from the initial value by the value corresponding to the first power of the first target energy storage unit. After determining the new allocable power, the energy management device repeats the above process of determining the first target energy storage unit. Since the first target energy storage unit is specifically a battery for storing energy without a determined allocated power, power will not be repeatedly allocated to a single energy storage unit.

[0079] If the allocable power is not greater than the first power of the first target energy storage cabinet, then the allocable power is determined as the allocated power of the first target energy storage cabinet. That is, all the allocable power is allocated to the first target energy storage cabinet, and the allocation of allocable power is completed. Furthermore, if there are other energy storage cabinets whose allocated power has not been determined at this time, then the allocated power of the energy storage cabinets whose allocated power has not been determined is determined to be zero, that is, they are kept in standby mode in subsequent operation until the next power allocation.

[0080] As can be seen, in this embodiment of the application, the allocatable power is allocated to multiple energy storage cabinets so that most of the energy storage cabinets allocated power can operate at the corresponding first power, so that the energy storage cabinets allocated power can operate at the optimal energy efficiency ratio, thereby improving the operating efficiency of multiple energy storage cabinets. At the same time, in the discharge state, the energy storage cabinet with the larger energy state is given priority to discharge, and in the charging state, the energy storage cabinet with the smaller energy state is given priority to charge, so that the energy state of multiple energy storage cabinets is kept at a similar level as much as possible.

[0081] In one possible embodiment, if the power allocation mode is determined to be a second mode, the method further includes: obtaining the operating mode of the energy storage system, wherein the operating mode is a charging mode or a discharging mode; identifying the energy storage cabinets among the plurality of energy storage cabinets whose allocated power has not been determined as second target energy storage cabinets; obtaining the second power of at least one second target energy storage cabinet, wherein the second power is the rated operating power of the corresponding energy storage cabinet; determining the power allocation ratio of each of the at least one second target energy storage cabinets based on the allocable power, the operating mode, and the battery state of charge of at least one second energy storage cabinet; and multiplying the power allocation ratio of the second target energy storage cabinet by the allocable power... The ideal allocation power of the corresponding second target energy storage cabinet is determined; if the ideal allocation power of the second target energy storage cabinet is greater than the second power of the corresponding second target energy storage cabinet, then the second power is determined as the allocation power of the corresponding second target energy storage cabinet; the difference between the allocable power and all determined allocation powers is determined as the new allocable power, and the above steps are repeated until the ideal allocation power is no greater than the second power of the corresponding second target energy storage cabinet; if the ideal allocation power of the second target energy storage cabinet is no greater than the second power of the corresponding second target energy storage cabinet, then the ideal allocation power of the second target energy storage cabinet is determined as the allocation power of the second target energy storage cabinet.

[0082] Specifically, in this embodiment, if multiple energy storage cabinets operate at the first power for a preset time, some energy storage cabinets may reach the state of being fully charged or fully discharged, resulting in asynchronous charging and discharging of multiple energy storage cabinets. Therefore, in this embodiment, the energy management device allocates the allocatable power of the energy storage system according to the battery charge state of the energy storage cabinets.

[0083] Please see Figure 5 , Figure 5 This is a schematic diagram illustrating a process for determining the allocation of energy storage cabinets according to a second mode, as provided in an embodiment of this application. Wherein... Figure 5 The energy management system first determines the operating mode of the energy storage system, which is either charging mode or discharging mode. The energy management system then selects a second target energy storage cabinet from among multiple energy storage cabinets; this second target cabinet is one whose allocated power has not yet been determined.

[0084] The energy management system acquires the second power of multiple second target energy storage cabinets. This second power is the rated power of the corresponding energy storage cabinet, i.e., the maximum operating power that the corresponding energy storage cabinet can accept, including rated charging power and rated discharging power. Based on the allocable power, operating mode, and the battery state of charge of at least one second target energy storage cabinet, the power allocation ratio of each of the at least one second target energy storage cabinets is determined, specifically including:

[0085] If the energy storage system operates in discharge mode, the power allocation ratio of the second target energy storage cabinet is determined by dividing the battery state of charge of the second target energy storage cabinet by the sum of the battery state of charge of all energy storage cabinets.

[0086] This is to allocate more discharge power to energy storage cabinets with higher battery state of charge in discharge mode, so that energy storage cabinets with higher energy state of charge discharge faster and energy storage cabinets with lower energy state of charge discharge more fully, thereby making the battery state of charge of multiple energy storage cabinets more similar after running for a preset time.

[0087] If the energy storage system operates in charging mode, the power allocation ratio for the corresponding second target energy storage cabinet is determined by dividing the remaining state of charge (SBC) of the second target energy storage cabinet by the sum of the SBCs of all energy storage cabinets. Here, the SBC of the second target energy storage cabinet represents the ratio of the energy required to reach full charging status to the total energy. Specifically, it is the difference between the total energy state of the corresponding second target energy storage cabinet and the SBC.

[0088] For example, if the battery state of charge of the second target energy storage cabinet is 30%, the remaining state of charge of the second target energy storage cabinet is 100% - 30% = 70%.

[0089] After determining the power allocation ratio of each second target energy storage cabinet, the product of the power allocation ratio of the second target energy storage cabinet and the allocable power is determined as the ideal allocation power of the corresponding second target energy storage cabinet. That is to say, according to the allocation ratio of each second target energy storage cabinet, the allocable power is allocated to each second target energy storage cabinet according to the power allocation ratio of multiple second energy storage cabinets.

[0090] Determine whether the ideal power allocation of the second target energy storage cabinet is greater than the second power of the corresponding second target energy storage cabinet, that is, whether it is greater than the rated power of the corresponding energy storage cabinet.

[0091] If the ideal allocated power of any one of the at least two target energy storage cabinets is greater than the second power of the corresponding target energy storage cabinet, then the allocated power of the corresponding target energy storage cabinet is determined as the corresponding second power, i.e., the rated power. The difference between the allocable power and all determined allocated powers is determined as the new allocable power, and the above steps are repeated until the ideal allocated power of all the target energy storage cabinets is no greater than the second power of the corresponding target energy storage cabinet.

[0092] If the ideal allocation power of any one of the at least two second target energy storage cabinets is not greater than the second power of the corresponding second target energy storage cabinet, then the ideal allocation power of the second target energy storage cabinet is determined as the allocation power of the second target energy storage cabinet, so as to complete the power allocation of all energy storage cabinets.

[0093] For example, please see Figure 6 , Figure 6 This is a schematic diagram illustrating multiple energy storage cabinets with the same state of charge (SOC) provided in an embodiment of this application. It includes four energy storage cabinets: from left to right, the first, second, third, and fourth energy storage cabinets have maximum capacities of 10kWh, 20kWh, 30kWh, and 40kWh, respectively. Their secondary power ratings are 10kW, 20kW, 30kW, and 40kW, respectively. All batteries have a SOC of 50%. If the allocable power is 100kW, according to existing power allocation methods, each of the four energy storage cabinets receives 25kW of power during charging or discharging. The entire energy storage system requires 0.8 hours to reach a fully charged or fully discharged state from its current state.

[0094] According to the second mode mentioned in the aforementioned application embodiment, the ideal allocated power of each energy storage cabinet is first calculated based on the battery state of charge of each cabinet. The ideal allocated power of each energy storage cabinet is 100kW*(50% / (50%+50%+50%+50%)) = 25kW. However, since the second power of the first and second energy storage cabinets are 10kW and 20kW respectively, the allocated power for the 10kWh and 20kWh energy storage cabinets can only be 10kW and 20kW respectively. Therefore, after the first round of allocation, the allocated power of the first energy storage cabinet is determined to be 10kW, the allocated power of the second energy storage cabinet is determined to be 20kW, and the remaining allocable power becomes 70kW.

[0095] The second round of allocation redistributes the 70kW power according to the state of charge (SOC) of the third and fourth energy storage cabinets. The ideal power allocation for each cabinet is 70kW * (50% / (50% + 50%)) = 35kW. However, since the second power of the third cabinet is also 30kW, its allocated power is limited to 30kW. The fourth cabinet, after the next round of allocation, is ultimately assigned 40kW. Finally, operating with the power allocated in the second mode, the entire station takes only 0.5 hours to go from 50% SOC to complete charging or discharging of all cabinets. This improves the operating efficiency of the energy storage cabinets and ensures that the SOC of each cabinet remains consistent throughout the operation.

[0096] For example, please see Figure 7This illustration shows information about multiple energy storage cabinets with different states of charge (SOCs) provided in an embodiment of this application. It includes four energy storage cabinets: from left to right, the fifth, sixth, seventh, and eighth cabinets have maximum capacities of 10kWh, 20kWh, 30kWh, and 40kWh, respectively. Their secondary power outputs are 25kW, 25kW, 30kW, and 30kW, respectively. The battery SOCs are 10%, 20%, 30%, and 40%, respectively. If the operating mode is discharge mode, the available power is 100kW. When this power is evenly distributed among the cabinets, the operating time required for each cabinet to discharge completely varies from 0.04h to 0.64h. This results in multiple cabinets not being able to discharge synchronously, and the energy storage system being unable to meet the output requirements of the available power at all times.

[0097] The power allocation for each energy storage cabinet is determined according to the second mode. First, the ideal power allocation is determined based on the battery state of charge of each cabinet. Taking the fifth energy storage cabinet as an example, the ideal power allocation for the first energy storage cabinet is 100kW * (10% / (10% + 20% + 30% + 40%)) = 10kW. Using the same calculation method, the ideal power allocation for the sixth, seventh, and eighth energy storage cabinets is 20kW, 30kW, and 40kW, respectively. The initial calculation method for the other energy storage cabinets is the same as for the fifth energy storage cabinet and will not be repeated here. Since the second power (rated power) of the eighth energy storage cabinet is 30kW, its allocated power is determined to be 30kW. The remaining allocable power is 70kW.

[0098] In the second round of calculations, based on the new allocable power of 70kW, the allocated power for the fifth, sixth, and seventh energy storage units is determined to be 11.667kW, 23.333kW, and 35kW, respectively. The calculation process is detailed above and will not be repeated here. The second power, i.e., the rated power, of the seventh energy storage unit is 30kW; therefore, in this round, the allocated power for the seventh energy storage unit is determined to be 30kW. The remaining allocable power is 40kW.

[0099] In the third round of calculations, based on the new allocable power of 40kW, the allocated power for the fifth and sixth energy storage units is determined to be 13.333kW and 26.667kW, respectively. The second power, i.e., the rated power, of the seventh energy storage unit is 25kW; therefore, in this round, the allocated power for the seventh energy storage unit is determined to be 25kW. The remaining allocable power is 15kW.

[0100] Finally, since the remaining allocable power is 15kW, and the second power of the seventh energy storage cabinet, i.e., the rated power, is 25W, the allocated power of the seventh energy storage cabinet in this round is determined to be 15kW. It can be seen that by using the allocation method in the embodiment of this application, the discharge time of each energy storage cabinet is as follows: fifth energy storage cabinet 10kWh*10% / 15kW=0.0667h, sixth energy storage cabinet 20kWh*20% / 25kW=0.16h, seventh energy storage cabinet 30kWh*30% / 30kW=0.3h, eighth energy storage cabinet 40kWh*40% / 30kW=0.533h. By operating multiple energy storage cabinets through power allocation, the energy storage system can operate at a maximum power of 100kW for a longer time than the average allocated power (25kW per energy storage cabinet).

[0101] As can be seen, in this embodiment of the application, the power allocation of the energy storage cabinet is determined proportionally by the battery state of charge of multiple energy storage cabinets, so that the energy storage cabinets work at the allocated power, which solves the problem that the energy storage system cannot maintain maximum power operation for a long time due to individual energy storage cabinets quickly entering the fully charged state or fully discharged state.

[0102] In one possible embodiment, before obtaining the allocatable power of the energy storage system, the first power of the multiple energy storage cabinets, and the battery state of charge of the multiple energy storage cabinets, the method further includes: obtaining the correspondence between the operating status data of the multiple energy storage cabinets and the first power; obtaining the operating status data of the multiple energy storage cabinets, the operating status data including at least one of the health status of the corresponding energy storage cabinet, ambient temperature, and battery state of charge; and determining the first power of the multiple energy storage cabinets based on the operating status data of each energy storage cabinet and the correspondence between the operating status data and the first power.

[0103] Specifically, in this embodiment, the first power of each energy storage cabinet needs to be determined through the operating status data of each energy storage cabinet. The correspondence between the operating status data and the first power is specifically an efficiency value curve, which records the power corresponding to the optimal energy efficiency ratio of the energy storage cabinet under continuous operating conditions. The efficiency value curve is obtained by testing the corresponding energy storage cabinet under different operating environments, and the efficiency value curves of energy storage cabinets with the same signal are the same.

[0104] Operational status data includes at least one of the following: the health status of the corresponding energy storage cabinet, ambient temperature, and battery state of charge. In actual testing conditions, there may be more or fewer operational status data.

[0105] The energy management device determines the corresponding first power by using the operating status data of each energy storage cabinet in multiple energy storage cabinets and the correspondence between the operating status data and the first power.

[0106] As can be seen, in this embodiment of the application, the first power of each energy storage cabinet under the current real-time operating status data is determined according to the correspondence between the operating status data of the energy storage cabinet and the first power, thereby improving the reliability of the first power of the energy storage cabinet and thus improving the efficiency of the energy storage cabinet operating under the first power.

[0107] In one possible embodiment, after determining the allocated power of multiple energy storage cabinets, the method further includes: controlling the multiple energy storage cabinets to operate according to the corresponding allocated power; after the multiple energy storage cabinets have operated according to the corresponding allocated power for a preset time, obtaining the actual energy consumption ratio of a third target energy storage cabinet, wherein the third target energy storage cabinet is the energy storage cabinet among the multiple energy storage cabinets whose allocated power is the corresponding first power; determining the theoretical energy consumption ratio of the third target energy storage cabinet based on the first power of the third target energy storage cabinet; and determining the operating state of the third target energy storage cabinet as an alarm state if the difference between the actual energy consumption ratio and the theoretical energy consumption ratio of the third target energy storage cabinet is greater than a preset difference.

[0108] Specifically, after determining the allocated power of multiple energy storage cabinets, the energy management device controls the operation of each energy storage cabinet according to its allocated power. After a preset operating time, it obtains the actual energy consumption ratio of a third target energy storage cabinet, which is the energy storage cabinet operating at the first power among the multiple energy storage cabinets. The actual energy consumption ratio is specifically determined by the ratio of the input electrical energy obtained from the first power of the energy storage cabinet and the estimated operating time to the actual stored electrical energy in the energy storage cabinet.

[0109] The theoretical energy consumption ratio here is determined based on the first power and the correspondence between the operating status data and the first power. The correspondence between the operating status data and the first power records the first power corresponding to the optimal energy consumption ratio of the energy storage cabinet under different operating status data and the corresponding theoretical energy consumption ratio.

[0110] If the difference between the actual energy consumption ratio and the theoretical energy consumption ratio is less than the preset difference, it indicates that the corresponding energy storage cabinet is operating normally, and its actual energy consumption ratio when operating at the first power is basically the same as the theoretically optimal energy consumption ratio when operating at the first power. If the difference between the actual energy consumption ratio and the theoretical energy consumption ratio is greater than the preset difference, it indicates that the corresponding energy storage cabinet may have experienced faults such as overheating or voltage instability during operation, resulting in a significant discrepancy between its actual energy consumption ratio and the theoretical energy consumption ratio when operating at the first power. Therefore, the operating status of the third target energy storage cabinet is determined to be an alarm state.

[0111] Furthermore, the third target energy storage cabinet is then stopped and an alarm message is generated to indicate that the third target energy storage cabinet has malfunctioned.

[0112] As can be seen from the embodiments of this application, the actual energy consumption ratio and theoretical energy consumption ratio of the energy storage cabinet are obtained to determine whether the energy storage cabinet is operating normally. When the difference between the actual energy consumption ratio and the theoretical energy consumption ratio is greater than a preset difference, it is determined that the corresponding energy storage cabinet has not experienced an operational fault. In this way, when the detection device of the corresponding energy storage cabinet fails and cannot properly determine the operating status of the energy storage cabinet, the operational fault of the energy storage cabinet can be detected in a timely manner, thereby further ensuring the operational safety of the energy storage system.

[0113] By implementing the methods in the above-described embodiments, it can be seen that allocating the available power to multiple energy storage cabinets in the first mode allows the cabinets to operate at the power corresponding to their optimal energy efficiency ratio, avoiding the problem that the energy storage system cannot maintain its maximum operating power for an extended period, while also improving the efficiency of the energy storage system. Allocating the available power to multiple energy storage cabinets in the first mode solves the problem that the energy storage system cannot maintain its maximum operating power for an extended period. When an energy storage cabinet is in an alarm state, the corresponding cabinet is either operated at a safe preset power or stopped, thus ensuring the safe operation of the energy storage cabinet. By obtaining the actual energy consumption ratio and theoretical energy consumption ratio of the energy storage cabinet, operational faults of the energy storage cabinet can be detected in a timely manner, further ensuring the operational safety of the energy storage system.

[0114] Based on the description of the above configuration method embodiments, this application also provides an energy management device 800, which can operate in... Figure 1 A computer program (including program code) is shown in the processor. This energy management device 800 can be applied to… Figure 1 The application scenarios shown are executed. Figure 2 The method shown. Please refer to [link / reference]. Figure 8 , Figure 8 This is a schematic diagram of the structure of an energy management device provided in an embodiment of this application. The energy management device 800 includes:

[0115] The acquisition unit 801 is used to acquire the allocatable power of the energy storage system, the first power of the plurality of energy storage cabinets, and the battery state of charge of the plurality of energy storage cabinets, wherein the first power is the operating power of the corresponding energy storage cabinet at the optimal energy efficiency ratio.

[0116] The determining unit 802 is used to determine the power allocation mode of the energy storage system based on the allocable power of the energy storage system, the first power of the plurality of energy storage cabinets and the battery state of charge of the plurality of energy storage cabinets. The power allocation mode includes a first mode and a second mode. The first mode indicates that the power allocation prioritizes the plurality of energy storage cabinets to operate at the first power, and the second mode indicates that the power allocation prioritizes the plurality of energy storage cabinets to be in a similar battery state of charge.

[0117] In one possible embodiment, in determining the power allocation mode of the energy storage system based on the allocatable power of the energy storage system, the first power of the multiple energy storage cabinets, and the battery state of charge of the multiple energy storage cabinets, the acquisition unit 801 is further specifically configured to: acquire the second power of the multiple energy storage cabinets, wherein the second power is the rated operating power of the corresponding energy storage cabinet; calculate the maximum operating power of the energy storage system based on the second power of the multiple energy storage cabinets; determine the expected battery state of charge of the multiple energy storage cabinets after operating at the first power for a preset time; if the allocatable power is less than the maximum operating power, and the expected battery state of charge of each of the multiple energy storage cabinets is less than a first preset threshold and greater than a second preset threshold, then the power allocation mode of the energy storage system is determined to be a first mode, wherein the first preset threshold is greater than the second preset threshold; if the allocatable power is less than the maximum operating power, and the expected battery state of charge of each of the multiple energy storage cabinets is not all less than the first preset threshold or not all greater than the second preset threshold, then the power allocation mode of the energy storage system is determined to be a second mode.

[0118] In one possible embodiment, before calculating the maximum operating power of the energy storage system based on the first power of the multiple energy storage cabinets, the acquisition unit 801 is further specifically configured to: acquire operating status data of the multiple energy storage cabinets, the operating status data including at least one of the health status of the corresponding energy storage cabinet, ambient temperature, and battery state of charge; analyze the operating status data of the multiple energy storage cabinets to obtain the operating status of the multiple energy storage cabinets; if the operating status of the energy storage cabinet is an alarm status, then determine the first power and allocated power of the corresponding energy storage cabinet as the preset power.

[0119] In one possible embodiment, if the power allocation mode is determined to be a first mode, the acquisition unit 801 is further specifically used to: acquire the operating mode of the energy storage system, wherein the operating mode is a charging mode or a discharging mode; if the operating mode is a charging mode, then the energy storage cabinet with the smallest corresponding battery state of charge among the multiple energy storage cabinets whose allocated power has not been determined is identified as the first target energy storage cabinet; if the operating mode is a discharging mode, then the energy storage cabinet with the largest corresponding battery state of charge among the multiple energy storage cabinets whose allocated power has not been determined is identified as the first target energy storage cabinet; if the allocable power is greater than the first power of the first target energy storage cabinet, then the first power of the first target energy storage cabinet is identified as the allocated power of the first target energy storage cabinet; the difference between the allocable power and the first power of the first target energy storage cabinet is identified as the new allocable power; the above steps are repeated until the allocable power is not greater than the first power of the first target energy storage cabinet; and the allocable power is identified as the allocated power of the first target energy storage cabinet.

[0120] In one possible embodiment, if the power allocation mode is determined to be the second mode, the acquisition unit 801 is further specifically configured to: acquire the operating mode of the energy storage system, wherein the operating mode is a charging mode or a discharging mode; identify the energy storage cabinets among the multiple energy storage cabinets whose allocated power has not been determined as the second target energy storage cabinets; acquire the second power of at least one second target energy storage cabinet, wherein the second power is the rated operating power of the corresponding energy storage cabinet; determine the power allocation ratio of each of the at least one second target energy storage cabinets based on the allocable power, the operating mode, and the battery state of charge of at least one second energy storage cabinet; and combine the power allocation ratio of the second target energy storage cabinets with the allocable power. The product of the two values ​​is determined as the ideal allocated power of the corresponding second target energy storage cabinet; if the ideal allocated power of the second target energy storage cabinet is greater than the second power of the corresponding second target energy storage cabinet, then the second power is determined as the allocated power of the corresponding second target energy storage cabinet; the difference between the allocable power and all determined allocated power is determined as the new allocable power, and the above steps are repeated until the ideal allocated power is no greater than the second power of the corresponding second target energy storage cabinet; if the ideal allocated power of the second target energy storage cabinet is no greater than the second power of the corresponding second target energy storage cabinet, then the ideal allocated power of the second target energy storage cabinet is determined as the allocated power of the second target energy storage cabinet.

[0121] In one possible embodiment, before acquiring the allocatable power of the energy storage system, the first power of the multiple energy storage cabinets, and the battery state of charge of the multiple energy storage cabinets, the acquisition unit 801 is further specifically configured to: acquire the correspondence between the operating status data of the multiple energy storage cabinets and the first power; acquire the operating status data of the multiple energy storage cabinets, the operating status data including at least one of the health status of the corresponding energy storage cabinet, ambient temperature, and battery state of charge; and determine the first power of the multiple energy storage cabinets based on the operating status data of each energy storage cabinet and the correspondence between the operating status data and the first power.

[0122] In one possible embodiment, after determining the allocated power of multiple energy storage cabinets, the acquisition unit 801 is further specifically used for: controlling the multiple energy storage cabinets to operate according to the corresponding allocated power; after the multiple energy storage cabinets have operated according to the corresponding allocated power for a preset time, acquiring the actual energy consumption ratio of the third target energy storage cabinet, wherein the third target energy storage cabinet is the energy storage cabinet among the multiple energy storage cabinets whose allocated power is the corresponding first power; determining the theoretical energy consumption ratio of the third target energy storage cabinet based on the first power of the third target energy storage cabinet; and if the difference between the actual energy consumption ratio and the theoretical energy consumption ratio of the third target energy storage cabinet is greater than a preset difference, then determining that the operating state of the third target energy storage cabinet is an alarm state.

[0123] Based on the description of the above method and device embodiments, please refer to... Figure 9 , Figure 9 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Figure 9The electronic device 900 shown (which may specifically be an electronic device) includes a memory 901, a processor 902, a communication interface 903, and a bus 904. The memory 901, processor 902, and communication interface 903 are interconnected via the bus 904.

[0124] The memory 901 may be a read-only memory (ROM), a static storage device, a dynamic storage device, or a random access memory (RAM).

[0125] The memory 901 can store programs. When the program stored in the memory 901 is executed by the processor 902, the processor 902 and the communication interface 903 are used to execute the various steps of the power distribution method of the energy storage cabinet in the embodiments of this application.

[0126] The processor 902 may be a general-purpose central processing unit (CPU), microprocessor, application specific integrated circuit (ASIC), graphics processing unit (GPU), or one or more integrated circuits, used to execute relevant programs to achieve the functions required by the units in the electronic device 900 of this application embodiment, or to execute the power distribution method of the energy storage cabinet of this application method embodiment.

[0127] The processor 902 can also be an integrated circuit chip with signal processing capabilities. In implementation, each step of the power distribution method for the energy storage cabinet of this application can be completed by the integrated logic circuits in the hardware of the processor 902 or by instructions in software form. The aforementioned processor 902 can also be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of this application. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the methods disclosed in the embodiments of this application can be directly embodied in the execution of a hardware decoding processor, or can be executed by a combination of hardware and software modules in the decoding processor. The software modules can be located in random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, or other mature storage media in the art. The storage medium is located in the memory 901. The processor 902 reads the information in the memory 901 and, in conjunction with its hardware, performs the functions required by the units included in the electronic device 900 of this application embodiment, or performs the power distribution method of the energy storage cabinet of this application method embodiment.

[0128] The communication interface 903 uses transceiver devices, such as, but not limited to, transceivers, to enable communication between the electronic device 900 and other devices or communication networks. For example, data can be acquired through the communication interface 903.

[0129] Bus 904 may include a pathway for transmitting information between various components of electronic device 900 (e.g., memory 901, processor 902, communication interface 903).

[0130] It should be noted that, although Figure 9 The illustrated electronic device 900 only shows a memory 901, a processor 902, and a communication interface 903. However, those skilled in the art should understand that in specific implementations, the electronic device 900 may also include other devices necessary for normal operation. Furthermore, depending on specific needs, those skilled in the art should understand that the electronic device 900 may also include hardware devices for implementing other additional functions. Moreover, those skilled in the art should understand that the electronic device 900 may only include the devices necessary for implementing the embodiments of this application, and may not necessarily include... Figure 9 All the devices shown.

[0131] This application embodiment also provides a chip, which includes a processor and a data interface. The processor reads instructions stored in the memory through the data interface to implement the power distribution method of the energy storage cabinet.

[0132] Optionally, as one implementation, the chip may further include a memory storing instructions, and the processor is used to execute the instructions stored in the memory. When the instructions are executed, the processor is used to execute the power distribution method of the energy storage cabinet.

[0133] This application also provides a computer-readable storage medium storing instructions that, when executed on a computer or processor, cause the computer or processor to perform one or more steps of any of the above methods.

[0134] This application also provides a computer program product containing instructions. When the computer program product is run on a computer or processor, it causes the computer or processor to perform one or more steps of any of the methods described above.

[0135] Those skilled in the art will appreciate that the functionality described in conjunction with the various illustrative logic blocks, modules, and algorithmic steps disclosed herein can be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, the functionality described by the various illustrative logic blocks, modules, and steps can be stored or transmitted as one or more instructions or codes on a computer-readable medium and executed by a hardware-based processing unit. The computer-readable medium may comprise a computer-readable storage medium, which corresponds to a tangible medium, such as a data storage medium, or a communication medium that includes any medium facilitating the transfer of a computer program from one place to another (e.g., based on a communication protocol). In this way, the computer-readable medium may substantially correspond to (1) a non-transitory tangible computer-readable storage medium, or (2) a communication medium, such as a signal or carrier wave. The data storage medium may be any available medium accessible by one or more computers or one or more processors to retrieve instructions, code, and / or data structures for implementing the techniques described in this application. A computer program product may comprise a computer-readable medium.

[0136] By way of example and not limitation, such computer-readable storage media may include RAM, ROM, EEPROM, CD-ROM or other optical disc storage devices, magnetic disk storage devices or other magnetic storage devices, flash memory, or any other media that can be used to store desired program code in the form of instructions or data structures and is accessible by a computer. Furthermore, any connection is properly referred to as computer-readable media. For example, if instructions are transmitted from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave, then coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of media. However, it should be understood that the computer-readable storage media and data storage media do not include connections, carrier waves, signals, or other temporary media, but are specifically addressed to non-temporary tangible storage media. As used herein, disks and optical discs include compact optical discs (CDs), laser optical discs, optical discs, digital versatile optical discs (DVDs), and Blu-ray discs, wherein disks typically reproduce data magnetically, while optical discs reproduce data optically using lasers. The combination of the above items should also be included in the scope of computer-readable media.

[0137] Instructions can be executed by one or more processors, such as digital signal processors (DSPs), general-purpose microprocessors, application-specific integrated circuits (ASICs), field-programmable arrays (FPGAs), or other equivalent integrated or discrete logic circuits. Therefore, the term "processor" as used herein can refer to any of the foregoing structures or any other structures suitable for implementing the techniques described herein. Furthermore, in some aspects, the functionality described in the various illustrative logic blocks, modules, and steps described herein can be provided within dedicated hardware and / or software modules configured for encoding and decoding, or incorporated into combined codecs. Moreover, the techniques can be fully implemented within one or more circuit or logic elements.

[0138] The technology of this application can be implemented in a wide variety of devices or apparatuses, including wireless handheld devices, integrated circuits (ICs), or a set of ICs (e.g., chipsets). The various components, modules, or units described in this application are intended to emphasize functional aspects of the apparatus for performing the disclosed technology, but do not necessarily need to be implemented by different hardware units. In fact, as described above, the various units can be combined with suitable software and / or firmware within coded hardware units, or provided via interoperable hardware units (containing one or more processors as described above).

[0139] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the specific descriptions of the corresponding steps in the foregoing method embodiments, and will not be repeated here.

[0140] It should be understood that in the description of this application, unless otherwise stated, " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B can represent A or B; where A and B can be singular or plural. Furthermore, in the description of this application, unless otherwise stated, "multiple" refers to two or more. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c can represent: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or multiple. Additionally, to facilitate a clear description of the technical solutions of the embodiments of this application, the terms "first" and "second" are used in the embodiments of this application to distinguish identical or similar items with substantially the same function and effect. Those skilled in the art will understand that the terms "first" and "second" do not limit the quantity or execution order, and the terms "first" and "second" do not necessarily imply difference. In this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design described as "exemplary" or "for example" in this application should not be construed as being better or more advantageous than other embodiments or designs. Specifically, the use of terms such as "exemplary" or "for example" is intended to present the relevant concepts in a specific manner to facilitate understanding.

[0141] In the embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the division of units is merely a logical functional division, and in actual implementation, there may be other division methods. For instance, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. The coupling, direct coupling, or communication connection shown or discussed between each other may be indirect coupling or communication connection through some interfaces, apparatuses, or units, and may be electrical, mechanical, or other forms.

[0142] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0143] In the above embodiments, implementation can be achieved, in whole or in part, through software, hardware, firmware, or any combination thereof. When implemented in software, it can be implemented, in whole or in part, as a computer program product. This computer program product includes one or more computer instructions. When these computer program instructions are loaded and executed on a computer, all or part of the flow or function according to the embodiments of this application is generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in or transmitted through a computer-readable storage medium. The computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium accessible to a computer or a data storage device such as a server or data center that integrates one or more available media. The available media can be read-only memory (ROM), random access memory (RAM), or magnetic media, such as floppy disks, hard disks, magnetic tapes, magnetic disks, or optical media, such as digital versatile discs (DVDs), or semiconductor media, such as solid state disks (SSDs).

[0144] The above description is merely a specific implementation of the embodiments of this application, but the protection scope of the embodiments of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the embodiments of this application should be covered within the protection scope of the embodiments of this application. Therefore, the protection scope of the embodiments of this application should be determined by the protection scope of the claims.

[0145] The device embodiments described above are merely illustrative. The units and modules described as separate components may or may not be physically separate. Furthermore, some or all of the units and modules can be selected to achieve the purpose of this embodiment, depending on actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0146] The above description is only a specific embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A power distribution method for an energy storage cabinet, characterized in that, Applied to an energy management device for managing multiple energy storage cabinets in an energy storage system, the method includes: Obtain the correspondence between the operating status data of the plurality of energy storage cabinets and the first power; obtain the operating status data of the plurality of energy storage cabinets, wherein the operating status data includes at least one of the health status, ambient temperature and battery state of charge of the corresponding energy storage cabinet; determine the first power of the plurality of energy storage cabinets based on the operating status data of each of the plurality of energy storage cabinets and the correspondence between the operating status data and the first power; The allocable power of the energy storage system, the first power of the plurality of energy storage cabinets, and the battery state of charge of the plurality of energy storage cabinets are obtained, wherein the first power is the operating power of the corresponding energy storage cabinet at the optimal energy efficiency ratio. The power allocation mode of the energy storage system is determined based on the allocatable power of the energy storage system, the first power of the plurality of energy storage cabinets, and the battery state of charge of the plurality of energy storage cabinets. The power allocation mode includes a first mode and a second mode. The first mode indicates that the power allocation prioritizes the plurality of energy storage cabinets to operate at the first power, and the second mode indicates that the power allocation prioritizes the plurality of energy storage cabinets to be in a similar battery state of charge.

2. The method according to claim 1, characterized in that, The step of determining the power allocation mode of the energy storage system based on the allocatable power of the energy storage system, the first power of the plurality of energy storage cabinets, and the battery state of charge of the plurality of energy storage cabinets includes: Obtain the second power of the plurality of energy storage cabinets, wherein the second power is the rated operating power of the corresponding energy storage cabinet. The maximum operating power of the energy storage system is calculated based on the second power of the plurality of energy storage cabinets; Determine the expected state of battery charge after the plurality of energy storage cabinets operate at the first power for a preset duration; If the allocatable power is less than the maximum operating power, and the expected state of charge of each of the plurality of energy storage cabinets is less than a first preset threshold and greater than a second preset threshold, then the power allocation mode of the energy storage system is determined to be the first mode, where the first preset threshold is greater than the second preset threshold. If the allocatable power is less than the maximum operating power, and the expected state of charge of the batteries in each of the plurality of energy storage cabinets is not less than a first preset threshold or not greater than a second preset threshold, then the power allocation mode of the energy storage system is determined to be the second mode.

3. The method according to claim 2, characterized in that, Before calculating the maximum operating power of the energy storage system based on the first power of the plurality of energy storage cabinets, the method further includes: Obtain the operating status data of the plurality of energy storage cabinets, wherein the operating status data includes at least one of the health status of the corresponding energy storage cabinet, ambient temperature, and battery state of charge; The operating status of the multiple energy storage cabinets is obtained by analyzing their operating status data. If the energy storage cabinet is in an alarm state, then the first power and allocated power of the corresponding energy storage cabinet will be determined as the preset power.

4. The method according to any one of claims 1-3, characterized in that, If the power allocation mode is determined to be the first mode, the method further includes: Obtain the operating mode of the energy storage system, wherein the operating mode is either charging mode or discharging mode; If the operating mode is the charging mode, then the energy storage cabinet with the smallest battery state of charge and no undetermined power allocation among the multiple energy storage cabinets is determined as the first target energy storage cabinet. If the operating mode is the discharge mode, then the energy storage cabinet with the largest battery state of charge among the multiple energy storage cabinets with undetermined power allocation is determined as the first target energy storage cabinet. If the allocatable power is greater than the first power of the first target energy storage cabinet, then the first power of the first target energy storage cabinet is determined as the allocatable power of the first target energy storage cabinet. The difference between the allocable power and the first power of the first target energy storage cabinet is determined as the new allocable power; Repeat the above steps until the allocable power is not greater than the first power of the first target energy storage cabinet; The allocable power is determined as the allocated power of the first target energy storage cabinet.

5. The method according to any one of claims 1-3, characterized in that, If the power allocation mode is determined to be the second mode, the method further includes: Obtain the operating mode of the energy storage system, wherein the operating mode is either charging mode or discharging mode; The energy storage cabinets whose power allocation has not been determined among the plurality of energy storage cabinets are identified as the second target energy storage cabinets; Obtain the second power of at least one second target energy storage cabinet, wherein the second power is the rated operating power of the corresponding energy storage cabinet; The power allocation ratio of each of the at least one second target energy storage cabinets is determined based on the allocable power, the operating mode, and the battery state of charge of the at least one second energy storage cabinet. The product of the power allocation ratio of the second target energy storage cabinet and the allocable power is determined as the ideal allocation power of the corresponding second target energy storage cabinet. If the ideal allocated power of the second target energy storage cabinet is greater than the second power of the corresponding second target energy storage cabinet, then the second power is determined as the allocated power of the corresponding second target energy storage cabinet. The difference between the allocable power and all determined allocable powers is determined as the new allocable power. The above steps are repeated until the ideal allocable power is no greater than the second power of the corresponding second target energy storage cabinet. If the ideal allocated power of the second target energy storage cabinet is not greater than the second power of the corresponding second target energy storage cabinet, then the ideal allocated power of the second target energy storage cabinet is determined as the allocated power of the second target energy storage cabinet.

6. The method according to claim 1, characterized in that, After determining the allocated power of the plurality of energy storage cabinets, the method further includes: Control the multiple energy storage cabinets to operate according to their corresponding allocated power; After the plurality of energy storage cabinets have been running for a preset time according to their corresponding allocated power, the actual energy consumption ratio of the third target energy storage cabinet is obtained. The third target energy storage cabinet is the energy storage cabinet among the plurality of energy storage cabinets whose allocated power is the corresponding first power. The theoretical energy consumption ratio of the third target energy storage cabinet is determined based on the first power of the third target energy storage cabinet; If the difference between the actual energy consumption ratio and the theoretical energy consumption ratio of the third target energy storage cabinet is greater than a preset difference, then the operating status of the third target energy storage cabinet is determined to be an alarm state.

7. An energy management device, characterized in that, The energy management device is used to execute the power distribution method of the energy storage cabinets. The energy management device belongs to the energy storage system and is used to manage multiple energy storage cabinets in the energy storage system. The device includes: An acquisition unit is configured to acquire the correspondence between the operating status data of the plurality of energy storage cabinets and the first power; acquire the operating status data of the plurality of energy storage cabinets, wherein the operating status data includes at least one of the health status, ambient temperature and battery state of charge of the corresponding energy storage cabinet; and determine the first power of the plurality of energy storage cabinets based on the operating status data of each of the plurality of energy storage cabinets and the correspondence between the operating status data and the first power. The acquisition unit is used to acquire the allocable power of the energy storage system, the first power of the plurality of energy storage cabinets and the battery state of charge of the plurality of energy storage cabinets, wherein the first power is the operating power of the corresponding energy storage cabinet at the optimal energy efficiency ratio. The determining unit is configured to determine the power allocation mode of the energy storage system based on the allocable power of the energy storage system, the first power of the plurality of energy storage cabinets, and the battery state of charge of the plurality of energy storage cabinets. The power allocation mode includes a first mode and a second mode. The first mode indicates that the power allocation prioritizes the plurality of energy storage cabinets operating at the first power, and the second mode indicates that the power allocation prioritizes the plurality of energy storage cabinets being in a similar battery state of charge.

8. An electronic device, characterized in that, The device includes a processor, a memory, a communication interface, and one or more computer programs, said one or more computer programs being stored in the memory and configured to be executed by the processor, said computer programs including instructions for performing the steps of the method as described in any one of claims 1-6.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program for electronic data interchange, wherein the computer program causes a processor to perform the method as described in any one of claims 1-6.

10. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by a processor, it implements the method as described in any one of claims 1-6.

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