Operating current distribution method and related device of energy storage equipment

Abstract

The present invention discloses a method for distributing the operating current of an energy storage device and a related device. The method includes: obtaining the protection current of N branches, the load current of N branches and the protection current of a bus; determining the total operating current of at least one first energy storage device according to the protection current of the bus and the load current of N branches; calculating the shunt ratio of M branches according to the protection current and load current of M branches, wherein M branches are branches including the first energy storage device among the M branches, and the shunt ratio is less than 1, M≤N; determining the first distribution current of M branches according to the product of the total operating current and the shunt ratio of M branches; determining the operating current of at least one first energy storage device according to the first distribution current of M branches, wherein the operating current of the first energy storage device is not greater than the first distribution current of the corresponding branch. By implementing the steps in the method, it is helpful to ensure the power safety of the energy storage system.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage equipment, and in particular to an operating current distribution method for energy storage equipment and related devices. Background Art

[0002] In the equipment architecture of the existing energy storage system, a main line and multiple branches are included. The bus in the energy storage system includes one or more energy storage devices. The one or more energy storage devices are controlled to charge or discharge under the premise that the maximum current of the bus does not exceed the protection current of the bus through the control device.

[0003] In the architecture of the prior art, the energy storage device is installed on the bus of the energy storage system. The control device controls one or more energy storage devices to operate at the same current, voltage and power through communication signals. The specifications / models of all energy storage devices in the energy storage system need to be consistent and can only be installed on the bus. If the energy storage device is directly installed on the branch line, the protection current of the bus is different from the protection current of the branch line. The control device continues to control one or more energy storage devices to charge or discharge on the premise that the maximum current of the bus does not exceed the protection current of the bus. This may cause the maximum current of an individual branch line to be higher than the protection current of the branch line, thereby causing power safety issues. Summary of the invention

[0004] In response to the above problems, the example of the present application provides an operating current distribution method and related devices for an energy storage device. Adopting the solution of the present application is conducive to ensuring the power safety of the energy storage system.

[0005] To achieve the above-mentioned purpose, in a first aspect, an embodiment of the present application provides an operating current distribution method for an energy storage device, which is applied to a control device of an energy storage system, wherein the energy storage system also includes a bus, N branches, at least one first energy storage device and at least one electrical device, the N branches are connected in series with the bus, the N branches are connected in parallel, at least one branch includes a first energy storage device, and at least one branch includes an electrical device, the method includes: obtaining protection currents of the N branches, load currents of the N branches, and protection currents of the bus; wherein the protection current is the maximum current value that the corresponding line can carry under the premise of ensuring safe operation, and the load current is the sum of the current values ​​generated by the electrical devices on the corresponding line; according to the protection current of the bus and the N branches, The total operating current of at least one first energy storage device is determined based on the load current of the at least one first energy storage device, and the current value carried by the bus when the at least one first energy storage device operates according to the total operating current is not greater than the protection current of the bus; the shunt ratio of the M branches is calculated based on the protection current and load current of the M branches, the shunt ratio is positively correlated with the protection current of the M branches, the M branches are the branches including the first energy storage device among the M branches, the shunt ratio is less than 1, and M≤N; the first distributed current of the M branches is determined based on the product of the total operating current and the shunt ratio of the M branches; the operating current of at least one first energy storage device is determined based on the first distributed current of the M branches, and the operating current of the first energy storage device is not greater than the first distributed current of the branch to which the first energy storage device belongs.

[0006] It can be seen that in the embodiment of the present application, multiple energy storage devices are installed on any one of the multiple branches of the energy storage system, and then the load current and protection current of each line are obtained by the control device to calculate the first distribution current of the target branch, and then the operating current of the energy storage device on each branch is determined according to the first distribution current, so that all energy storage devices operate according to the corresponding operating current, and the energy storage device can be freely installed on any branch, which improves the convenience of the energy storage system while ensuring the power safety of the energy storage system.

[0007] In combination with the first aspect, in a possible embodiment, the load current of N branches is obtained, including: obtaining the branch current of the first target branch, the branch current being the sum of the currents generated by the first energy storage device and the power consumption device in operation on the first target branch, and the first target branch being any one of the N branches; determining the system state of the energy storage system, the system state including a charging state or a discharging state, in which all the first energy storage devices in the energy storage system are in a charging state, and in which all the first energy storage devices in the energy storage system are in a discharging state; if the system state is a charging state, obtaining the total charging current of the first target branch, the total charging current being the sum of the currents generated by charging all the first energy storage devices in operation on the first target branch; determining the load current of the first target branch according to the difference between the branch current of the first target branch and the total charging current of the first target branch; if the system state is a discharging state, obtaining the total discharging current of the first target branch, the total discharging current being the sum of the currents generated by discharging all the first energy storage devices in operation on the first target branch; determining the load current of the first target branch according to the sum of the branch current of the first target branch and the total discharging current of the first target branch.

[0008] It can be seen that in the embodiment of the present application, when calculating the load current of the N branches of the energy storage system according to the system state of the energy storage system, the influence of the operating state of the energy storage device on the load current is taken into account, thereby improving the accuracy of the load current.

[0009] In combination with the first aspect, in a possible embodiment, the total operating current of at least one first energy storage device is determined according to the protection current of the bus and the load current of N branches, including: determining the system state of the energy storage system, the system state includes a charging state or a discharging state, in the charging state, all the first energy storage devices in the energy storage system are in a charging state, and in the discharging state, all the first energy storage devices in the energy storage system are in a discharging state; if the system state is a charging state, the total operating current is determined according to the difference between the protection current of the bus and the load current of the N branches; if the system state is a discharging state, the surplus power management strategy of the energy storage system is determined, and the surplus power management strategy includes surplus power online or surplus power not online; if the surplus power management strategy is surplus power online, the total operating current is determined according to the sum of the protection current of the bus and the load current of the N branches; if the surplus power management strategy is surplus power not online, the total operating current is determined according to the load current of the N branches.

[0010] In combination with the first aspect, in a possible embodiment, the shunt ratio of the M branches is calculated according to the protection current and load current of the M branches, and the shunt ratio is positively correlated with the protection current of the M branches, including: determining the system state of the energy storage system, the system state includes a charging state or a discharging state, in the charging state, all the first energy storage devices in the energy storage system are in a charging state, and in the discharging state, all the first energy storage devices in the energy storage system are in a discharging state; if the system state is a charging state, then the shunt ratio of the second target branch is determined according to the proportion of the difference between the protection current of the second target branch and the load current of the second target branch in the difference between the protection current of the M branches and the load current of the M branches; the second target branch is any one of the M branches; if the system state is a discharging state, then the shunt ratio of the second target branch is determined according to the sum of the protection current of the second target branch and the load current of the second target branch, in the sum of the protection current of the M branches and the load current of the M branches.

[0011] It can be seen that in the embodiment of the present application, by determining the system state, the total operating current of the first energy storage device in the energy storage system is determined according to different methods under different system states, and the influence of the system state on the total operating current is taken into account, thereby improving the accuracy of the total operating current and ensuring operational safety.

[0012] In combination with the first aspect, in a possible embodiment, the operating current of at least one first energy storage device is determined according to the first distributed current of M branches, including: obtaining the rated current of all first energy storage devices on a second target branch, where the second target branch is any one of the M branches; determining the operating current of the target first energy storage device according to the first distributed current of the second target branch and the ratio of the rated current of the target first energy storage device to the sum of the rated currents of at least one first energy storage device on the second target branch.

[0013] It can be seen that in the embodiment of the present application, different calculation methods are used to calculate the diversion ratios of the M branches according to different system states. When calculating the diversion ratios of the M branches, the influence of the system state is taken into account, thereby improving the rationality of the diversion ratios, so that the energy storage devices on the branches with larger maximum allowable discharge currents can obtain larger operating currents, thereby ensuring the safe operation of the energy storage system.

[0014] In combination with the first aspect, in a possible embodiment, after determining the operating current of at least one first energy storage device according to the first distribution current of M branches, the method also includes: determining the maximum operating current of the second target branch, the maximum operating current being the current carried by the corresponding branch when all the first energy storage devices on the corresponding branch are operating according to the corresponding operating current, and the second target branch is any one of the M branches; obtaining the rated current of all the first energy storage devices on the second target branch; if the operating current of any one of the first energy storage devices on the second target branch is greater than the corresponding rated current; then determining the second distribution current of the M branches based on the operating current and the rated current of the first energy storage device whose operating current is greater than the corresponding rated current; obtaining the remaining carryable current of the M-1 branches other than the second target branch, the remaining carryable current being determined based on the difference between the protection current of the corresponding branch and the corresponding maximum operating current; if the remaining carryable current of any one of the M-1 branches is not less than the second distribution current, then re-determining the operating current of all the first energy storage devices on the branches whose remaining carryable current is not less than the second distribution current based on the current to be distributed.

[0015] It can be seen that in the embodiment of the present application, when the operating current of the first energy storage device on any branch line of the energy storage system is greater than the corresponding rated current, which affects the power safety of the energy storage system, the normal operation of all devices in the energy storage system and the power safety of the energy storage system are guaranteed by distributing the excess current on the branch line to other branches.

[0016] In combination with the first aspect, in a possible embodiment, if the remaining carryable current of any branch among the M-1 branches is less than the second allocated current, the method also includes: determining the allocated branch from the M-1 branches, the allocated branch being a branch having the largest sum of the rated currents of all corresponding first energy storage devices in the M-1 branches and a corresponding maximum operating circuit greater than the protection circuit; redetermining the operating currents of all first energy storage devices on the allocated branch according to the first allocated current and the second allocated current of the allocated branch; determining a new current to be allocated according to the operating currents of all first energy storage devices on the allocated branch according to the second allocated current, and repeating the step of determining the allocated branch from the M-1 branches until the new current to be allocated is no greater than a preset threshold.

[0017] It can be seen that in the embodiment of the present application, the current that cannot be carried by a branch line is allocated to the branch line with the largest sum of the rated currents of the first energy storage device based on the order of the largest sum of the rated currents of all the energy storage devices in the branch line, so that under the premise of satisfying the normal operation of the electrical equipment in the energy storage system, more energy storage devices in the energy storage system can operate at rated power, thereby ensuring the safe operation of the energy storage system and improving the working efficiency of the energy storage devices.

[0018] In a second aspect, an embodiment of the present application provides an operating current distribution device for an energy storage device, which is used to execute an operating current distribution method for an energy storage device, and belongs to an energy storage system, wherein the energy storage system further includes a bus, N branches, at least one first energy storage device, and at least one electrical device, wherein the N branches are connected in series with the bus, and the N branches are connected in parallel, wherein at least one branch includes a first energy storage device, and at least one branch includes an electrical device, and the device includes:

[0019] An acquisition unit, used to acquire the protection current of N branches, the load current of N branches and the protection current of the bus; wherein the protection current is the maximum current value that the corresponding line can carry for safe operation, and the load current is the sum of the current values ​​generated by the electrical equipment on the corresponding line;

[0020] A determination unit, configured to determine a total operating current of at least one first energy storage device according to a protection current of the bus and load currents of the N branches, wherein a current value carried by the bus when the at least one first energy storage device operates according to the total operating current is not greater than a protection current of the bus;

[0021] a determining unit, configured to determine a shunt ratio of the M branches according to the protection current and the load current of the M branches, the shunt ratio being positively correlated with the protection current of the M branches, the M branches being branches including the first energy storage device among the N branches, the shunt ratio being less than 1, and M≤N;

[0022] A calculation unit, configured to calculate a first distributed current of the M branches according to a product of a total operating current and a current distribution ratio of the M branches;

[0023] The determination unit is used to determine the operating current of at least one first energy storage device according to the first distributed currents of the M branches, and the operating current of the first energy storage device is not greater than the first distributed current of the branch to which the first energy storage device belongs.

[0024] In a third aspect, an embodiment of the present application provides an electronic device, comprising a processor, a memory, a communication interface, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the processor, and one or more instructions are suitable for being loaded by the processor and executing part or all of the method of the first aspect.

[0025] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium storing a computer program for electronic data exchange, wherein the computer program enables a processor to execute part or all of the method of the first aspect.

[0026] In a fifth aspect, the present application provides a computer program product. When a computer reads and executes the computer program product, the processor executes the method in any possible design of the first aspect above.

[0027] It can be understood that the beneficial effects of the embodiments of the second to fifth aspects can refer to the beneficial effects of the method of the first aspect, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 A schematic diagram of the installation of a series connection of energy storage devices provided in an embodiment of the present application;

[0030] Figure 2 A schematic diagram of an installation of energy storage devices in parallel provided in an embodiment of the present application;

[0031] Figure 3 A schematic diagram of an application scenario of a method for distributing operating current of an energy storage device provided in an embodiment of the present application;

[0032] Figure 4 A schematic diagram of a flow chart of an operating current distribution method for an energy storage device provided in an embodiment of the present application;

[0033] Figure 5 A schematic diagram of system status settings of an energy storage system provided in an embodiment of the present application;

[0034] Figure 6 A schematic diagram of a surplus power management strategy provided in an embodiment of the present application;

[0035] Figure 7 A schematic diagram of the current direction of an energy storage device provided in an embodiment of the present application;

[0036] Figure 8 A schematic diagram of a distribution process of a current to be distributed provided in an embodiment of the present application;

[0037] Fig. 9 A schematic diagram of energy storage device parameters of an energy storage system provided in an embodiment of the present application;

[0038] Fig.10 A schematic diagram of the structure of an operating current distribution device for an energy storage device provided in an embodiment of the present application;

[0039] Fig.11 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0040] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0041] The terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices.

[0042] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0043] The embodiments of the present application are described below in conjunction with the accompanying drawings.

[0044] The existing energy storage system usually includes a control device, a local power grid, multiple energy storage devices and multiple power consumption devices. The local power grid includes a bus and multiple parallel branches, and the bus is connected to the external power grid. The energy storage device is usually connected to the bus in parallel or in series, and the power consumption device is usually connected to one of the multiple branches in parallel. Charging or discharging is performed based on the instructions of the control device.

[0045] See also Figure 1 , Figure 1 A schematic diagram of an installation of a series connection of energy storage devices provided in an embodiment of the present application, in Figure 1 In the energy storage system shown, the energy storage devices are connected to the bus of the energy storage system in series. After the current on the grid side enters the energy storage system, it is first input into the energy storage device, and then input into other electrical devices in the subsequent branch line through the energy storage device. More energy storage devices can be connected to the bus based on the same installation method.

[0046] See also Figure 2 , Figure 2A schematic diagram of an installation of energy storage devices in parallel provided in an embodiment of the present application, in Figure 2 In the energy storage system shown, the energy storage devices are connected to the bus of the energy storage system in parallel. After the current on the grid side is input from the bus, it can be directly transmitted to other electrical devices in the branch line, or input to the energy storage device to charge the energy storage device. More energy storage devices can be connected to the bus based on the same installation method.

[0047] exist Figure 1 and Figure 2 In the connection mode shown, whether in parallel or in series, the energy storage device needs to be installed in the bus, and the control device of the energy storage system is also installed in the bus. The control device of the energy storage system controls the energy storage device based on the same control logic. The control logic of the control device for the energy storage device is as follows: when a single machine is used, there is only one energy storage device in the energy storage system, or only one energy storage device in the energy storage system is running and other energy storage devices are on standby, and the discharge power is determined based on the total power of the power consumption device; the charging power is usually the rated charging power of the energy storage device itself; when multiple machines are used, multiple energy storage devices are operated based on the premise of shared load, that is, multiple energy storage devices simultaneously supply power to the same power consumption device (one or more), so the discharge power is determined based on the total power of the power consumption device. A total discharge power is then evenly distributed to each energy storage device; the charging power is also the rated charging power of the energy storage device itself. Under the above control logic, the specifications / models of the inverters in each energy storage device are required to be consistent, so that the control device can use communication signals to keep the discharge power or charging power of each energy storage device consistent, that is, power sharing.

[0048] Based on the above-mentioned various access methods and the specific structure of the energy storage device, in the prior art, the specifications / models of the energy storage device need to be consistent, and the energy storage device must be installed at the home bus position, and cannot be arbitrarily connected to the branch line in the energy storage system, which limits the convenience of using the energy storage device. If the energy storage device is directly connected to each branch line in the energy storage system, the control device continues to control multiple energy storage devices by power sharing. Since the protection current of each branch line is lower than the protection current of the bus, if the control device still controls the energy storage device according to the original control logic, the current of individual branches in the energy storage system will be higher than the protection current, which will cause power safety problems.

[0049] To solve the above problem, see Figure 3 , Figure 3A schematic diagram of an application scenario of an operating current distribution method for an energy storage device provided in an embodiment of the present application, wherein the energy storage system in the application scenario 300 includes a control device 301, a first energy storage device 302, an electrical device 303, a bus 304 and a branch line 305, wherein the first energy storage device 302 and the electrical device 303 are connected to any one of the branch lines 305, one end of the bus 304 is connected in series with four branch lines 305, and one end is connected to a power grid, and the four branch lines 305 are connected in parallel.

[0050] When the energy storage system is in a charging state, current flows in from the power grid, passes through the bus 304, and the branch line 305 to be input into the first energy storage device 302 and the power consumption device 303. When the energy storage system is in a discharging state, current flows out from the first energy storage device 302, passes through the branch line 305, and is input into the power consumption device 303, or flows out from the first energy storage device 302, passes through the branch line 305 and the bus 304, and is output to the power grid.

[0051] The control device 301 is specifically a control device of an energy management system (EMS), which can be connected to any line in the application scenario 300. The control device 301 can also be powered by an independent power supply, so it does not need to be connected to any line in the application scenario 300. The control device 301 is connected to the first energy storage device 302 and communicates through communication signals or electrical signals, thereby controlling the first energy storage device 302. The line here refers to a bus or a branch line.

[0052] Here, the first energy storage device 302 is connected to any one of the four branches 305 in the application scenario 300, and the four branches 305 are respectively the first branch, the second branch, the third branch and the fourth branch from top to bottom. Through the instruction of the control device 301, the first energy storage device 302 works according to the operating parameters indicated by the control device 301 in the operating states such as charging, discharging, and standby, and the operating parameters include parameters such as current or power.

[0053] The electrical equipment 303 here is an electrical appliance, specifically a lamp, a television and the like.

[0054] In the embodiment of the present application, the control device 301 obtains the protection current of the four branches 305, the load current of the four branches 305 and the protection current of the bus 304; the protection current here is the maximum current value that the corresponding line can carry under the premise of ensuring safe operation, and the load current is the sum of the current values ​​generated by the electrical equipment on the corresponding line; Figure 3Taking the first branch line 305 from top to bottom, i.e. the first branch line 305, as an example, the first branch line 305 includes a first energy storage device 302 and an electrical device 303. When the current value of the first branch exceeds the protection current, the control device 301 controls the first branch line 305 to disconnect from the bus to ensure power safety. The load current of the first branch line 305 is the current value generated by the electrical device 303 on the first branch line 305.

[0055] The control device 301 determines the total operating current of at least one first energy storage device 302 according to the protection current of the bus 304 and the load current of the four branches 305. When at least one first energy storage device 302 operates according to the total operating current, the current value carried by the bus is not greater than the protection current of the bus.

[0056] Three branches 305 including at least one first energy storage device are determined from the four branches 305, namely, Figure 3 The first branch line 305, the second branch line 305 and the fourth branch line 305 shown in the figure calculate the shunt ratio of the three branches 305 according to the protection current and the load current of the three branches 305, the shunt ratio is positively correlated with the protection current of the three branches 305, the shunt ratio is less than 1, M≤N;

[0057] The control device 301 determines the first distributed current of the three branches 305 according to the product of the total operating current and the diversion ratio of the three branches 305. That is to say, the first distributed current here is determined based on the protection current of the corresponding branch 305. The larger the first protection current corresponding to the branch 305, the larger the first distributed current is. More current is allocated to the straight line with a larger protection current, and less current is allocated to the straight line with a smaller protection current, thereby ensuring the safety of electricity use on the line.

[0058] The control device 301 determines the operating current of at least one first energy storage device according to the first distributed currents of the three branches 305 , and the operating current of the first energy storage device is not greater than the first distributed current of the branch 305 to which the first energy storage device belongs.

[0059] It can be seen that in the embodiment of the present application, multiple energy storage devices are installed on any one of the multiple branches of the energy storage system, and then the load current and protection current of each line are obtained by the control device to calculate the first distribution current of the target branch, and then the operating current of the energy storage device on each branch is determined according to the first distribution current, so that all energy storage devices operate according to the corresponding operating current, and the energy storage device can be freely installed on any branch, which improves the convenience of the energy storage system while ensuring the power safety of the energy storage system.

[0060] See also Figure 4 , Figure 4A schematic diagram of a flow chart of a method for distributing operating current of an energy storage device provided in an embodiment of the present application, which can be based on Figure 3 The application scenario shown is implemented as follows Figure 4 As shown, steps S401-S404 are included:

[0061] S401: The control device obtains the protection current of N branches, the load current of N branches and the protection current of the bus; wherein the protection current is the maximum current value that the corresponding line can carry for safe operation, and the load current is the sum of the current values ​​generated by the electrical equipment on the corresponding line;

[0062] Specifically, the target energy storage device here is the energy storage device that is connected to the energy storage system for the first time. The target energy storage device needs to send a power distribution request to the control device to obtain the corresponding operating current, and then operate according to the instructions of the control device. The energy storage system here includes multiple parallel branches, each of which can be connected to any number of energy storage devices and power devices, and the number of connected energy storage devices and power devices can be changed at any time.

[0063] Furthermore, before the control device obtains the protection current of the N branches, the load current of the N branches, and the protection current of the bus, the method further includes: obtaining a current distribution request of the second energy storage device, determining a third target branch connected to the second energy storage device, the third target branch being one of the N branches connected to the second energy storage device. If it is determined that the third target branch connected to the second energy storage device is successful, the second energy storage device is determined as a new first energy storage device, and the protection current of the N branches and subsequent steps are obtained.

[0064] The second energy storage device here is an energy storage device newly connected to the energy storage system. After the new energy storage device is connected to the system, the energy storage system cannot determine which of the N branches the second energy storage device is connected to. Therefore, it is necessary to determine the third target branch connected to the second energy storage device (specifically, it can be obtained by inputting it into the control device through the user of the energy storage system, communicating with the second energy storage device, etc.). In other words, the first energy storage device is an energy storage device whose corresponding branch is recorded by the control device, and the second energy storage device is an energy storage device whose corresponding branch is not recorded by the control device. It can be seen that after the new energy storage device is connected to the energy storage system, the control device determines the corresponding third target branch, thereby re-determining the operating current of all energy storage devices in the energy storage system, thereby realizing that the energy storage device can be connected to the new energy storage device at any time during the operation of the energy storage system, thereby improving the convenience of using the energy storage system.

[0065] In a possible embodiment, the load current of N branches is obtained, including: obtaining a branch current of a first target branch, the branch current being the sum of currents generated by the first energy storage device and the power consumption device in operation on the first target branch, the first target branch being any one of the N branches; determining a system state of the energy storage system, the system state comprising a charging state or a discharging state, wherein all first energy storage devices in the energy storage system are in a charging state in the charging state, and all first energy storage devices in the energy storage system are in a discharging state in the discharging state; if the system state is a charging state, obtaining a total charging current of the first target branch, the total charging current being the sum of currents generated by charging of all the first energy storage devices in operation on the first target branch; determining the load current of the first target branch according to the difference between the branch current of the first target branch and the total charging current of the first target branch; if the system state is a discharging state, obtaining a total discharging current of the first target branch, the total discharging current being the sum of currents generated by discharging of all the first energy storage devices in operation on the first target branch; determining the load current of the first target branch according to the sum of the branch current of the first target branch and the total discharging current of the first target branch.

[0066] Specifically, in the embodiment of the present application, each branch line is also equipped with a current measuring device (specifically an ammeter, a current sensor, a shunt, etc.), and the current measuring device is used to measure the branch line current on the corresponding branch line; the measured branch line current is the current value generated by the energy storage device and the power-consuming device on the corresponding branch line when they are running simultaneously. Therefore, it is necessary to determine the actual load current based on the system state and the measured current value. The following is explained using the first target branch line as an example, and the method for determining the load current of other branches is the same as that of the first target branch line.

[0067] The control device first obtains the branch current of the first target branch (specifically measured by a current measuring device connected to the first target branch and then sent to the control device); determines the system state of the energy storage system, which includes a charging state or a discharging state.

[0068] For example, see Figure 5 , Figure 5 A schematic diagram of the system state setting of an energy storage system provided in an embodiment of the present application shows that different system states of the energy storage system corresponding to two time periods are recorded on the control device, wherein the system state of the energy storage system in the first time period is a charging state, and the system state of the energy storage system in the second time period is a discharging state. The control device determines the corresponding system state by acquiring the current time information.

[0069] If the system state is charging state, the control device obtains the total charging current of the first target branch. The total charging current of the first target branch is the sum of the current values ​​generated by charging all the first energy storage devices on the first target branch. The operating current of each first energy storage device is allocated by the control device, so the control device can directly obtain the total charging current of the first target branch. For example, if there are two energy storage devices on the first target branch, which are charged with currents of 2A and 5A respectively, the total charging current of the first target branch is 2A+5A=7A.

[0070] The first energy storage devices here are all in a charging state, and the branch current includes the current generated by the charging of the first energy storage device and the current generated by the operation of the electrical equipment. Therefore, the difference between the branch current and the total charging current is the current generated by the electrical equipment, and then the current generated by the electrical equipment can be directly determined as the load current of the first target branch. Furthermore, in order to consider that other electrical equipment may be connected to the first target branch at any time, the sum of the current generated by the electrical equipment and the preset circuit is determined as the load current of the first target branch.

[0071] If the difference between the measured current and the total charging current is directly determined as the load current of the target branch, the load current satisfies the following formula (1):

[0072]

[0073] Among them, I loadN is the load current of the Nth branch, I CTN is the branch current of the Nth branch, I CTN-ESS-L-O It is the charging current of the Lth energy storage device under the N branches.

[0074] For example, if the branch current of the first target branch is 10A and the total charging current is 5A, then the load current of the target branch is 10A-5A=5A.

[0075] If the system state is a discharge state, it should be noted that the current generated by the electrical equipment in the energy storage system flows from the power grid to the energy storage system. Therefore, the current generated by the electrical equipment in the embodiment of the present application is a positive number, and the discharge direction of the first energy storage device in the discharge state seems to be from the energy storage system to the power grid, so the total discharge current of the first energy storage device is a negative number.

[0076] Therefore, the control device obtains the total discharge current of the first target branch, which is the sum of the currents generated by the discharge of all the first energy storage devices in operation on the first target branch. Similar to the charging state, the control device here can directly obtain the total discharge current of the first target branch. Then, the corresponding load current is determined according to the sum of the branch current of the first target branch and the total discharge current.

[0077] If the sum of the measured current and the total discharge current is directly determined as the corresponding load current, the energy storage devices here are all in the discharge state, so the measured current is measured after the current discharged by the energy storage device is directly supplied to the electrical equipment in the target branch line. Therefore, the load current of the target branch line is determined here based on the sum of the measured current and the total charging current. If the sum of the measured current and the total charging current is directly determined as the load current of the target branch line, the load current satisfies the following formula (2):

[0078]

[0079] Among them, I loadN is the load current of the Nth branch, I CTN is the branch current of the Nth branch, I CTN-ESS-L-O is the charging current of the Lth energy storage device under the first target branch. For example, if the branch current of the first target branch is 10A and the total discharge current is -5A, the load current rating of the target branch is 10A+(-5A)=15A.

[0080] It can be seen that in the embodiment of the present application, when calculating the load current of the N branches of the energy storage system according to the system state of the energy storage system, the influence of the operating state of the energy storage device on the load current is taken into account, thereby improving the accuracy of the load current.

[0081] Furthermore, considering that more energy storage devices may be added to the N branches, after obtaining the load currents of the N branches, the method also includes: obtaining the historical load current of the first target branch, the historical load current being the load current determined by the corresponding branch in the historical period; obtaining the current time information, and determining the historical load current of the first target branch in the historical period corresponding to the current time information; if the load current is not greater than the historical load current, determining the historical load current of the historical period corresponding to the current time information as the new load circuit; if the load current is greater than the historical load current, and the absolute value of the difference between the load current and the historical load current is greater than a preset threshold, determining the sum of the load current and the preset current as the new preset current.

[0082] It can be seen that in the embodiment of the present application, by obtaining the historical load current of the corresponding branch line, when the load current is less than the historical load current, the historical load current is determined as the new load current and then the subsequent operating current calculation is performed, so that the historical load current of the corresponding branch line is taken into account when the target energy storage device operates under the operating current, thereby reducing the possibility that the maximum current of the corresponding branch line exceeds the protection current during subsequent operation, and further ensuring the operating safety of the corresponding branch line.

[0083] S402: The control device determines the total operating current of at least one first energy storage device according to the protection current of the bus and the load currents of the N branches, and the current value carried by the bus when the at least one first energy storage device operates according to the total operating current is not greater than the protection current of the bus.

[0084] Specifically, the load current here is the sum of the current values ​​generated by all electrical devices on the corresponding branch line, which is measured and calculated by the current measuring device installed on the corresponding branch line, or determined by the control device communicating with all electrical devices in the energy storage system. The protection current here is the current value on the corresponding line that can trigger the action of the protection device. When the current value on the line reaches or exceeds the protection current, the control device will turn on the corresponding protection device, such as a fuse, overcurrent relay, etc.

[0085] In a possible embodiment, the total operating current of at least one first energy storage device is determined according to the protection current of the bus and the load current of N branches, including: determining the system state of the energy storage system, the system state includes a charging state or a discharging state, in which all the first energy storage devices in the energy storage system are in a charging state, and in a discharging state, all the first energy storage devices in the energy storage system are in a discharging state; if the system state is a charging state, the total operating current is determined according to the difference between the protection current of the bus and the load current of the N branches; if the system state is a discharging state, the surplus power management strategy of the energy storage system is determined, and the surplus power management strategy includes surplus power being online or surplus power not being online; if the surplus power management strategy is surplus power being online, the total operating current is determined according to the sum of the protection current of the bus and the load current of the N branches; if the surplus power management strategy is surplus power not being online, the total operating current is determined according to the load current of the N branches.

[0086] Specifically, in an embodiment of the present application, the control device determines the total operating current of at least one first energy storage device based on the bus protection current and the load currents of N branches, where the total operating current specifically refers to the sum of the operating currents of all first energy storage devices in the energy storage system.

[0087] The control device first determines the system state of the energy storage system. For the relevant description of the system state, please refer to the aforementioned related content and will not be repeated here.

[0088] If the system state is in a charging state, the total operating current is determined based on the difference between the protection current of the bus and the load current of the N branches. This is because when the system state is in a charging state, all first energy storage devices are also in a charging state. Therefore, the operating current of the first energy storage device and the current generated by the operation of the electrical equipment are provided by the power grid and need to pass through the bus. Therefore, the maximum value of the total operating current of all first energy storage devices in the energy storage system is the difference between the protection current of the bus and the load current of the N branches. If the maximum value of the total operating current of all first energy storage devices is directly determined as the total operating current here, the total operating current satisfies the following formula (3):

[0089]

[0090] Among them, I MAX is the total operating current, I CT0-P is the protection current of the bus, I loadN is the load current of the Nth branch line.

[0091] If the system state is in a discharge state, the control device also needs to determine the surplus power management strategy of the energy storage system. The surplus power management strategy includes whether the surplus power is connected to the grid or not connected to the grid; and then the total operating current is determined according to the surplus power management strategy, the protection current, and the load current. The surplus power connected to the grid refers to the energy storage device releasing the excess electric energy to the grid on the premise that the electrical equipment in the energy storage system works normally, and the surplus power not connected to the grid refers to the energy storage device not releasing the excess electric energy to the grid on the premise that the electrical equipment in the energy storage system works normally. That is to say, under the surplus power connected to the grid strategy, the electric energy in the energy storage device will be transmitted to the grid in addition to being transmitted to the electrical equipment, while under the surplus power not connected to the grid strategy, the electric energy in the energy storage device will only be transmitted to the load.

[0092] For example, see Figure 6 , Figure 6 This is a schematic diagram of a surplus power management strategy provided in an embodiment of the present application. The surplus power management strategy is set by the user or administrator of the energy storage system on the control device. Figure 6 The surplus power management strategy shown is configured with surplus power access to the Internet, spare time strategy, charge and discharge cut-off power, etc. The control device determines the total operating current according to the surplus power management strategy here.

[0093] If the surplus power management strategy is to connect surplus power to the grid, the energy storage device in the target branch line needs to release the power to the grid. Figure 7 , Figure 7 A schematic diagram of the current direction of an energy storage device provided in an embodiment of the present application, in which it can be seen that under the surplus power grid-connected strategy, a portion of the current output by the energy storage device flows into the power-consuming device in the branch line to supply the power-consuming device with power, and the corresponding current value is I 2 , the other part of the current is input into the grid, and the corresponding current value is I1 Therefore, only the current from the input grid flows through the bus, where I 1 +I 2 =I 0 The maximum value of the maximum current of the input grid is the protection current of the bus. The maximum value of the total operating current of all first energy storage devices in the energy storage system is the sum of the maximum current of the input grid and the current of the input power device. If the maximum value of the total operating current of all first energy storage devices is directly determined as the total operating current here, the total operating current satisfies the following formula (4):

[0094]

[0095] Among them, I MAX is the total operating current, I CT0-P is the protection current of the bus, I loadN is the load current of the Nth branch line.

[0096] If the surplus power management strategy is that the surplus power is not connected to the grid, the energy storage equipment in the energy storage system only needs to meet the power demand of the power-consuming equipment in the energy storage system. Therefore, the total operating current of the branch line is determined according to the load current of the branch line. Specifically, the sum of the load currents of N branches is directly determined as the total operating current here.

[0097] It can be seen that in the embodiment of the present application, by determining the system state, the total operating current of the first energy storage device in the energy storage system is determined according to different methods under different system states, and the influence of the system state on the total operating current is taken into account, thereby improving the accuracy of the total operating current and ensuring operational safety.

[0098] S403: The control device determines the shunt ratio of the M branches according to the protection current and load current of the M branches, the shunt ratio is positively correlated with the protection current of the M branches, the M branches are branches including the first energy storage device among the N branches, the shunt ratio is less than 1, and M≤N.

[0099] Specifically, the M branches here specifically refer to the M branches including the first energy storage device among the N branches. For example, there are a total of 5 branches in the energy storage system, 2 of which include the first energy storage device. The M branches here specifically refer to the 2 branches including the first energy storage device.

[0100] In a possible embodiment, the shunt ratio of the M branches is calculated according to the protection current and load current of the M branches, and the shunt ratio is positively correlated with the protection current of the M branches, including: determining the system state of the energy storage system, the system state includes a charging state or a discharging state, in which all the first energy storage devices in the energy storage system are in a charging state, and in a discharging state, all the first energy storage devices in the energy storage system are in a discharging state; if the system state is a charging state, the shunt ratio of the second target branch is determined according to the proportion of the difference between the protection current of the second target branch and the load current of the second target branch in the difference between the protection current of the M branches and the load current of the M branches; the second target branch is any one of the M branches; if the system state is a discharging state, the shunt ratio of the second target branch is determined according to the sum of the protection current of the second target branch and the load current of the second target branch, in the sum of the protection current of the M branches and the load current of the M branches.

[0101] Specifically, in the embodiment of the present application, the control device calculates the shunt ratio of the M branches according to the protection current and load current of the M branches, thereby allocating the total operating current to each of the M branches according to the shunt ratio of the M branches.

[0102] The diversion ratio here is specifically determined according to the system state of the energy storage system. For the relevant description of the system state, please refer to the aforementioned related content and will not be repeated here.

[0103] If the system state is a charging state, the shunt ratio of the second target branch is determined according to the proportion of the difference between the protection current of the second target branch and the load current of the second target branch in the difference between the protection current of the M branches and the load current of the M branches; the second target branch is any one of the M branches. Here, the difference between the protection current of the second target branch and the load current of the second target branch represents the maximum allowable charging current of the first energy storage device on the second target branch. In other words, the greater the maximum allowable charging current on the second target branch, the greater the shunt ratio of the second target branch. If the system state is a charging state, the shunt ratio of the M branches satisfies the following formula (5):

[0104]

[0105] Among them, a M is the diversion ratio of the Mth branch line, I CTM-P is the protection current of the Mth branch line, I loadM is the load current of the Mth branch.

[0106] If the system state is in a discharge state, the shunt ratio of the second target branch is determined according to the sum of the protection current of the second target branch and the load current of the second target branch, and the proportion of the sum of the protection current of the M branches and the load current of the M branches. Here, the sum of the protection current of the second target branch and the load current of the second target branch represents the maximum allowable discharge current of the first energy storage device on the second target branch. In other words, the greater the maximum allowable discharge current on the second target branch, the greater the shunt ratio of the second target branch. If the system state is in a discharge state, the shunt ratio of the M branches satisfies the following formula (6):

[0107]

[0108] Among them, a M is the diversion ratio of the Mth branch line, I CTM-P is the protection current of the Mth branch line, I loadM is the load current of the Mth branch.

[0109] It can be seen that in the embodiment of the present application, different calculation methods are used to calculate the diversion ratios of the M branches according to different system states. When calculating the diversion ratios of the M branches, the influence of the system state is taken into account, thereby improving the rationality of the diversion ratios, so that the energy storage devices on the branches with larger maximum allowable discharge currents can obtain larger operating currents, thereby ensuring the safe operation of the energy storage system.

[0110] S404: The control device calculates the first distributed current of the M branches according to the product of the total operating current and the diversion ratio of the M branches.

[0111] Specifically, the control device calculates the first distributed current of each branch line based on the product of the total operating circuit and the diversion ratio of each set of branches. For example, if the total operating current is 20A, and the diversion ratio of a target branch line among the M branches is 0.25, the first distributed current of the branch line is 20A×0.25=5A.

[0112] Furthermore, the first distribution current here can also be calculated by the difference between the product of the total operating current and the shunt ratio and a preset threshold value, or the product of the total operating current, the shunt ratio and the reduction ratio.

[0113] S405: The control device determines the operating current of at least one first energy storage device according to the first distributed currents of the M branches, and the operating current of the first energy storage device is not greater than the first distributed current of the branch to which the first energy storage device belongs.

[0114] Specifically, after the control device determines the first distribution current of each branch, it determines the operating current of the target energy storage device based on the first distribution current of each branch. If there is only one first energy storage device on the branch, the operating current of the target energy storage device is the first distribution current here. If there are multiple first energy storage devices on the branch, the first distribution current can be distributed evenly, giving priority to the first energy storage device with a larger rated current, or according to the state of charge and other rules to distribute the first distribution current to multiple first energy storage devices on the branch.

[0115] In a possible embodiment, determining the operating current of at least one first energy storage device according to the first distributed current of M branches includes: obtaining the rated current of all first energy storage devices on a second target branch, where the second target branch is any one of the M branches; determining the operating current of the target first energy storage device according to the ratio of the first distributed current of the second target branch and the rated current of the target first energy storage device to the sum of the rated currents of at least one first energy storage device on the second target branch.

[0116] Specifically, in the embodiment of the present application, the second target branch is taken as an example for explanation, and the second target branch is any one of the M branches. First, the rated current of all the first energy storage devices on the second target branch is obtained. All the first energy storage devices on the second target branch are managed by the control device, and the control device usually records the rated current of all the first energy storage devices on the second target branch. The target first energy storage device is any one of all the first energy storage devices on the second target branch, and the operating current of the first energy storage device satisfies the following formula (7):

[0117]

[0118] Among them I CTN-ESS-L is the operating current of the Lth first energy storage device, I CTM-MAX is the first distributed current of the Mth branch, I CTN-ESS-L is the rated current of the Lth first energy storage device.

[0119] In a possible embodiment, after determining the operating current of at least one first energy storage device according to the first distribution current of M branches, the method also includes: determining the maximum operating current of the second target branch, the maximum operating current being the current carried by the corresponding branch when all the first energy storage devices on the corresponding branch are operating according to the corresponding operating current, and the second target branch is any one of the M branches; obtaining the rated current of all the first energy storage devices on the second target branch; if the operating current of any one of the first energy storage devices on the second target branch is greater than the corresponding rated current; then determining the second distribution current of the M branches according to the operating current and the rated current of the first energy storage device whose operating current is greater than the corresponding rated current; obtaining the remaining carryable current of the M-1 branches other than the second target branch, the remaining carryable current being determined according to the difference between the protection current of the corresponding branch and the corresponding maximum operating current; if the remaining carryable current of any one of the M-1 branches is not less than the second distribution current, then re-determining the operating current of all the first energy storage devices on the branches whose remaining carryable current is not less than the second distribution current according to the current to be distributed.

[0120] Specifically, in an embodiment of the present application, if too many or too few energy storage devices are connected to any one of the M branches, problems may occur such as the operating current of any energy storage device on the target branch being greater than the corresponding rated current, which may affect the safe operation of the energy storage system. Therefore, when the operating current of any first energy storage device on the second target branch is greater than the corresponding rated current, it is necessary to redistribute the excess portion of the distributed current of the target branch.

[0121] The control device first determines the maximum operating current of the second target branch line, which is the current carried by all first energy storage devices on the corresponding branch line when operating according to the corresponding operating current, including the current generated by the power-consuming equipment and the current generated by the energy storage equipment.

[0122] If the operating current of any first energy storage device on the second target branch is greater than the corresponding rated current, the second distribution current of the M branches is determined according to the operating current and the rated current of the first energy storage device whose operating current is greater than the corresponding rated current. The second distribution current here is the excess current that cannot be carried on the second target branch here, so it needs to be redistributed to the M-1 branches here.

[0123] For example, if the operating current of a first energy storage device on the second target branch is 10.76 A and the rated current is 9.09 A, the second distributed current of the M branches here is 10.76 A-9.09 A=1.67 A. The 1.67 A here needs to be distributed to the other branches among the M branches except the second target branch.

[0124] Obtain the remaining carryable current of M-1 branches other than the second target branch. If the remaining carryable current of any one of the multiple branches is not less than the second allocated current, it means that any one branch can carry all the excess current in the second target branch.

[0125] The operating current of all first energy storage devices on the branch line whose remaining carryable current is not less than the second distributed current is re-determined according to the current to be distributed, that is, the second distributed current is preferentially distributed to a branch line whose remaining carryable current is not less than the second distributed current.

[0126] Furthermore, if the maximum operating current of any energy storage device on any one of the multiple branches is greater than the corresponding protection current, then determining the second distributed current of the M branches according to the operating current and the rated current of the first energy storage device whose operating current is greater than the corresponding rated current specifically includes: if the operating current of any first energy storage device on the second target branch is greater than the corresponding rated current, and if the maximum operating current of any one of the multiple branches is not greater than the corresponding protection current, then determining the second distributed current of the M branches according to the operating current and the rated current of the first energy storage device whose operating current is greater than the corresponding rated current.

[0127] If the operating current of any first energy storage device on the second target branch is not greater than the corresponding rated current, and if the maximum operating current of any one of the multiple branches is greater than the corresponding protection current, the second distributed current of the M branches is determined according to the operating current and protection current of the branch whose maximum operating current is greater than the corresponding protection current.

[0128] If the operating current of any first energy storage device on the second target branch is greater than the corresponding rated current, and if the maximum operating current of any one of the multiple branches is not greater than the corresponding protection current, the second distributed current of the M branches is determined according to the operating current and the rated current of the first energy storage device whose operating current is greater than the corresponding rated current, and the operating current and the protection current of the branch whose maximum operating current is greater than the corresponding protection current.

[0129] It can be seen that in the embodiment of the present application, when the operating current of the first energy storage device on any branch line of the energy storage system is greater than the corresponding rated current, which affects the power safety of the energy storage system, the normal operation of all devices in the energy storage system and the power safety of the energy storage system are guaranteed by distributing the excess current on the branch line to other branches.

[0130] In a possible embodiment, if the remaining carryable current of any branch among the M-1 branches is less than the second allocated current, the method further includes: determining the allocated branch from the M-1 branches, the allocated branch being a branch having the largest sum of the rated currents of all corresponding first energy storage devices in the M-1 branches and a corresponding maximum operating circuit greater than the protection circuit; redetermining the operating currents of all first energy storage devices on the allocated branch according to the first allocated current and the second allocated current of the allocated branch; determining a new current to be allocated according to the operating currents of all first energy storage devices on the allocated branch according to the second allocated current, and repeating the step of determining the allocated branch from the M-1 branches until the new current to be allocated is no greater than a preset threshold.

[0131] Specifically, the remaining carryable current of each of the M-1 branches is less than the second allocated current, which means that the excess current on the second target branch cannot be allocated to a single branch. In the embodiment of the present application, the allocated branch is determined from the multiple branches in the order of the largest sum of the rated currents of all the first energy storage devices by polling, thereby allocating the current to be allocated to multiple other branches.

[0132] See also Figure 8 , Figure 8 A schematic diagram of a distribution process of a current to be distributed provided in an embodiment of the present application includes steps S801-S804:

[0133] S801: Determine the allocated branch line from the M-1 branches.

[0134] Specifically, the control device first determines the allocated branch from the M-1 branches outside the second target branch, and the allocated branch is the branch with the largest sum of the rated currents of all the corresponding first energy storage devices in the M-1 branches and a corresponding maximum operating circuit greater than the protection circuit. After allocating part of the current in the second allocation to the allocated branch, the first energy storage device in the allocated branch can operate at the rated voltage.

[0135] S802: Re-determine the operating currents of all first energy storage devices on the allocated branch line according to the first allocated current and the second allocated current of the allocated branch line.

[0136] For the method of distributing the operating current of each first energy storage device on the distributed branch line, please refer to the relevant description of the operating current distribution of the target first energy storage device mentioned above, which will not be repeated here. If the operating current of the first energy storage device exceeds the corresponding rated current, the rated current of the energy storage device is determined as the corresponding operating current.

[0137] S803: Determine a new current to be distributed according to the second distributed current and the operating currents of all first energy storage devices on the distributed branch line.

[0138] Specifically, the operating current of all the first energy storage devices here is the part of the current to be distributed that is allocated to the allocated branch. The new current to be distributed is the difference between the current to be distributed and the sum of the operating currents of at least one first energy storage device in the allocated branch. For example, if the current to be distributed is 10A, and the sum of the operating currents of at least one first energy storage device in the allocated branch is 3A, the new current to be distributed is 7A.

[0139] S804: Whether the current to be distributed is greater than a preset threshold.

[0140] Specifically, if the current to be allocated is not greater than a preset threshold (such as 0A, 0.5A, etc.), the allocation is terminated, and the control device controls the operation of all energy storage devices based on the currently determined operating current. If the current to be allocated is greater than the preset threshold, the aforementioned S801, i.e., subsequent steps, are repeated.

[0141] It can be seen that in the embodiment of the present application, the current that cannot be carried by a branch line is allocated to the branch line with the largest sum of the rated currents of the first energy storage device based on the order of the largest sum of the rated currents of all the energy storage devices in the branch line, so that under the premise of satisfying the normal operation of the electrical equipment in the energy storage system, more energy storage devices in the energy storage system can operate at rated power, thereby ensuring the safe operation of the energy storage system and improving the working efficiency of the energy storage devices.

[0142] For example, see Fig. 9 , Fig. 9 A schematic diagram of energy storage device parameters of an energy storage system provided in an embodiment of the present application includes 5 different lines, including a bus, a first branch line, a second branch line, a third branch line and a fourth branch line. Fig. 9 The protection current, measured current, and state of the corresponding first energy storage device of each branch are recorded. In this example, the operation state of the first energy storage device is charging state, and the charging cut-off power is 95%, that is, the first energy storage device with a remaining energy state of 95 will be in standby state and will not enter the subsequent operation current calculation process.

[0143] Take the first branch line as an example. There are 4 first energy storage devices under the first branch line, of which there are 2 first energy storage devices with a rated power of 1kW, and the corresponding residual energy status is 30, that is, the remaining power is 30%. There are 2 first energy storage devices with a rated power of 2kW, one of which has a residual energy status of 30 and the other 95. Since the first energy storage device with a residual energy status of 95 is in standby mode, it is not included in the subsequent calculation, which is equivalent to the first branch line having 3 energy storage devices under its jurisdiction, including 2 first energy storage devices with a rated power of 1kW.

[0144] If the voltage of the energy storage system is 220V, the rated current of the 1kW first energy storage device is 4.54A, and the rated charging current of the 2kW first energy storage device is 9.09A.

[0145] Based on the calculation method in the aforementioned steps, the total operating current of all first energy storage devices is calculated first. Since the system state of the energy storage system is a charging state, the total operating current is 40A-20A=20A.

[0146] Secondly, the shunt ratio of each branch is calculated, where the shunt ratio of the first branch to the fourth branch is determined based on the difference between the protection current and the load current of each branch (i.e., the maximum operating current), and the difference between the protection current and the load current of the first branch to the fourth branch is 5A, 2A, 5A, and 18A, respectively. In order to meet the needs of electrical equipment that may exist in the future, the protection current and the difference between the protection current and the load current of each branch are subtracted from the preset current (here the preset current is 1A), and the final total operating current is 19A. Exemplarily, the first distribution current of the first branch satisfies the following formula (8):

[0147]

[0148] Further, according to the first distributed current of the first branch and the rated current of the first energy storage device in the first branch, it is calculated that the operating current of the 1kW energy storage device is 0.63A, and the operating current of the 2kW energy storage device is 1.26A.

[0149] For example, the operating current of a 1kW energy storage device satisfies the following formula (9):

[0150]

[0151] Based on the above method, the operating currents of all the first energy storage devices in the first branch to the fourth branch are calculated.

[0152] Among them, only one first energy storage device with a rated power of 2kW is connected to the fourth branch line, so the operating current of the fourth branch line (10.76A) will be allocated to the first energy storage device with a rated power of 2kW. Obviously, it exceeds the rated operating current of the first energy storage device, and the excess current (10.76A-9.09A=1.67A), that is, the second distribution current, needs to be distributed to other branches. Since the remaining three branches cannot receive all the differences, the difference needs to be split. According to the order of "the first energy storage device to which the branch belongs has the largest rated total charging power", they are sorted in sequence, and are allocated to the first branch line first, then to the third branch line, and finally to the second branch line.

[0153] By implementing the method in the above application embodiment, it can be seen that in the embodiment of the present application, the energy storage device can be installed in any one of the multiple branches, which improves the convenience of the energy storage system. The operating current of each energy storage device is determined by the control device to ensure the power safety of the energy storage system. Through different calculation methods, the impact of the operating state of the energy storage device on the load current is considered, and the impact of the system state on the total operating current is considered. The first distribution current is determined according to different methods under different system states, which improves the accuracy of the total operating current and the first distribution current and the diversion ratio in the energy storage system. The excess current is distributed to other branches to ensure the normal operation of all equipment in the energy storage system and the power safety of the energy storage system.

[0154] Based on the description of the above configuration method embodiment, the present application also provides an operating current distribution device 1000 for an energy storage device. The operating current distribution device 1000 for an energy storage device can be a device operating at Figure 3 A computer program (including program code) in a processor shown in FIG. The operating current distribution device 1000 of the energy storage device can be applied to Figure 3 The application scenario shown in the figure is executed Figure 4 See the method shown in Fig.10 , Fig.10 This is a schematic diagram of the structure of an operating current distribution device of an energy storage device provided in an embodiment of the present application. The operating current distribution device 1000 of the energy storage device includes:

[0155] The acquisition unit 1001 is used to acquire the protection current of N branches, the load current of N branches and the protection current of the bus; wherein the protection current is the maximum current value that the corresponding line can carry for safe operation, and the load current is the sum of the current values ​​generated by the electrical equipment on the corresponding line;

[0156] A determination unit 1002 is used to determine a total operating current of at least one first energy storage device according to the protection current of the bus and the load currents of the N branches, wherein a current value carried by the bus when the at least one first energy storage device operates according to the total operating current is not greater than the protection current of the bus;

[0157] A determination unit 1002 is used to determine a shunt ratio of the M branches according to the protection current and the load current of the M branches, the shunt ratio is positively correlated with the protection current of the M branches, the M branches are branches including the first energy storage device among the N branches, the shunt ratio is less than 1, and M≤N;

[0158] A calculation unit 1003, configured to calculate a first distributed current of the M branches according to a product of a total operating current and a current distribution ratio of the M branches;

[0159] The determining unit 1002 is configured to determine an operating current of at least one first energy storage device according to the first distributed currents of the M branches, wherein the operating current of the first energy storage device is not greater than the first distributed current of the branch to which the first energy storage device belongs.

[0160] In a possible embodiment, in terms of acquiring the load current of N branches, the acquisition unit 1001 is further specifically used to: acquire the branch current of the first target branch, the branch current being the sum of the currents generated by the first energy storage device and the power consumption device in operation on the first target branch, and the first target branch being any one of the N branches; determine the system state of the energy storage system, the system state including a charging state or a discharging state, in which all the first energy storage devices in the energy storage system are in a charging state, and in a discharging state all the first energy storage devices in the energy storage system are in a discharging state; if the system state is a charging state, acquire the total charging current of the first target branch, the total charging current being the sum of the currents generated by charging all the first energy storage devices in operation on the first target branch; determine the load current of the first target branch according to the difference between the branch current of the first target branch and the total charging current of the first target branch; if the system state is a discharging state, acquire the total discharging current of the first target branch, the total discharging current being the sum of the currents generated by discharging all the first energy storage devices in operation on the first target branch; determine the load current of the first target branch according to the sum of the branch current of the first target branch and the total discharging current of the first target branch.

[0161] In a possible embodiment, in terms of determining the total operating current of at least one first energy storage device according to the protection current of the bus and the load currents of N branches, the determination unit 1002 is further specifically used to: determine the system state of the energy storage system, the system state includes a charging state or a discharging state, in which all first energy storage devices in the energy storage system are in a charging state, and in a discharging state, all first energy storage devices in the energy storage system are in a discharging state; if the system state is a charging state, the total operating current is determined according to the difference between the protection current of the bus and the load currents of the N branches; if the system state is a discharging state, the surplus power management strategy of the energy storage system is determined, the surplus power management strategy includes surplus power being online or surplus power not being online; if the surplus power management strategy is surplus power being online, the total operating current is determined according to the sum of the protection current of the bus and the load currents of the N branches; if the surplus power management strategy is surplus power not being online, the total operating current is determined according to the load currents of the N branches.

[0162] In a possible embodiment, in terms of calculating the shunt ratio of the M branches according to the protection current and the load current of the M branches, and the shunt ratio is positively correlated with the protection current of the M branches, the determination unit 1002 is also specifically used to: determine the system state of the energy storage system, the system state includes a charging state or a discharging state, in which all first energy storage devices in the energy storage system are in a charging state, and in a discharging state, all first energy storage devices in the energy storage system are in a discharging state; if the system state is a charging state, the shunt ratio of the second target branch is determined according to the proportion of the difference between the protection current of the second target branch and the load current of the second target branch in the difference between the protection current of the M branches and the load current of the M branches; the second target branch is any one of the M branches; if the system state is a discharging state, the shunt ratio of the second target branch is determined according to the proportion of the sum of the protection current of the second target branch and the load current of the second target branch in the sum of the protection current of the M branches and the load current of the M branches.

[0163] In a possible embodiment, in terms of determining the operating current of at least one first energy storage device based on the first distributed current of the M branches, the acquisition unit 1001 is further specifically used to: obtain the rated current of all first energy storage devices on the second target branch, the second target branch being any one of the M branches; and determine the operating current of the target first energy storage device based on the first distributed current of the second target branch and the ratio of the rated current of the target first energy storage device to the sum of the rated currents of at least one first energy storage device on the second target branch.

[0164] In a possible embodiment, after determining the operating current of at least one first energy storage device according to the first distribution current of M branches, the determination unit 1002 is further specifically used to: determine the maximum operating current of the second target branch, the maximum operating current being the current carried by the corresponding branch when all the first energy storage devices on the corresponding branch are operating according to the corresponding operating current, and the second target branch is any one of the M branches; obtain the rated current of all the first energy storage devices on the second target branch; if the operating current of any one of the first energy storage devices on the second target branch is greater than the corresponding rated current; then determine the second distribution current of the M branches according to the operating current and the rated current of the first energy storage device whose operating current is greater than the corresponding rated current; obtain the remaining carryable current of the M-1 branches other than the second target branch, the remaining carryable current is determined according to the difference between the protection current of the corresponding branch and the corresponding maximum operating current; if the remaining carryable current of any one of the M-1 branches is not less than the second distribution current, then re-determine the operating current of all the first energy storage devices on the branch whose remaining carryable current is not less than the second distribution current according to the current to be distributed.

[0165] In a possible embodiment, if the remaining carryable current of any branch among the M-1 branches is less than the second allocated current, the determination unit 1002 is further specifically used to: determine the allocated branch from the M-1 branches, the allocated branch being the branch having the largest sum of the rated currents of all the corresponding first energy storage devices in the M-1 branches and a corresponding maximum operating circuit greater than the protection circuit; redetermine the operating current of all the first energy storage devices on the allocated branch according to the first allocated current and the second allocated current of the allocated branch; determine a new current to be allocated according to the operating current of all the first energy storage devices on the allocated branch according to the second allocated current, and repeat the step of determining the allocated branch from the M-1 branches until the new current to be allocated is no greater than the preset threshold.

[0166] Based on the description of the above method embodiment and device embodiment, please refer to Fig.11 , Fig.11 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application. Fig.11 The electronic device 1100 shown (the electronic device 1100 may be a computer device) includes a memory 1101, a processor 1102, a communication interface 1103 and a bus 1104. The memory 1101, the processor 1102 and the communication interface 1103 are connected to each other through the bus 1104.

[0167] The memory 1101 may be a read-only memory (ROM), a static storage device, a dynamic storage device or a random access memory (RAM).

[0168] The memory 1101 can store programs. When the program stored in the memory 1101 is executed by the processor 1102, the processor 1102 and the communication interface 1103 are used to execute the various steps of the operating current distribution method of the energy storage device in the embodiment of the present application.

[0169] The processor 1102 can adopt a general central processing unit (CPU), a microprocessor, an application specific integrated circuit (ASIC), a graphics processing unit (GPU) or one or more integrated circuits to execute relevant programs to implement the functions required to be performed by the units in the electronic device 1100 of the embodiment of the present application, or to execute the operating current distribution method of the energy storage device of the method embodiment of the present application.

[0170] The processor 1102 may also be an integrated circuit chip having signal processing capabilities. In the implementation process, each step of the operating current distribution method of the energy storage device of the present application may be completed by an integrated logic circuit of hardware or software instructions in the processor 1102. The above-mentioned processor 1102 may also be a general-purpose processor, a digital signal processor (Digital Signal Processing, DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (Field Programmable Gate Array, FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The methods, steps and logic block diagrams disclosed in the embodiments of the present application may be implemented or executed. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc. The steps of the method disclosed in the embodiments of the present application may be directly embodied as being executed by a hardware decoding processor, or executed by a combination of hardware and software modules in a decoding processor. The software module may be located in a mature storage medium in the art such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory or an electrically erasable programmable memory, a register, etc. The storage medium is located in the memory 1101, and the processor 1102 reads the information in the memory 1101, and combines its hardware to complete the functions required to be performed by the units included in the electronic device 1100 of the embodiment of the present application, or executes the operating current distribution method of the energy storage device of the method embodiment of the present application.

[0171] The communication interface 1103 uses a transceiver such as, but not limited to, a transceiver to implement communication between the electronic device 1100 and other devices or a communication network. For example, data can be acquired through the communication interface 1103 .

[0172] The bus 1104 may include a path for transmitting information between various components of the electronic device 1100 (eg, the memory 1101 , the processor 1102 , and the communication interface 1103 ).

[0173] It should be noted that although Fig.11 The electronic device 1100 shown only shows a memory 1101, a processor 1102, and a communication interface 1103. However, in the specific implementation process, those skilled in the art should understand that the electronic device 1100 also includes other devices necessary for normal operation. At the same time, according to specific needs, those skilled in the art should understand that the electronic device 1100 may also include hardware devices for implementing other additional functions. In addition, those skilled in the art should understand that the electronic device 1100 may also include only the devices necessary for implementing the embodiments of the present application, and does not necessarily include Fig.11 All devices shown in .

[0174] An embodiment of the present application further provides a chip, which includes a processor and a data interface. The processor reads instructions stored in a memory through the data interface to implement the operating current distribution method of the energy storage device.

[0175] Optionally, as an implementation method, the chip may further include a memory, in which instructions are stored, 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 operating current distribution method of the energy storage device.

[0176] An embodiment of the present application also provides a computer-readable storage medium, which stores instructions. When the computer-readable storage medium is executed on a computer or a processor, the computer or the processor executes one or more steps in any of the above methods.

[0177] The embodiment of the present application further provides a computer program product including instructions. When the computer program product is executed on a computer or a processor, the computer or the processor executes one or more steps in any of the above methods.

[0178] Those skilled in the art will appreciate that the functions described in conjunction with the various illustrative logic blocks, modules, and algorithm steps disclosed herein can be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, the functions described in 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. Computer-readable media may include computer-readable storage media, which corresponds to tangible media, such as data storage media, or includes any media (e.g., based on a communication protocol) that facilitates the transfer of a computer program from one place to another. In this manner, computer-readable media may generally correspond to (1) non-temporary tangible computer-readable storage media, or (2) communication media, such as signals or carrier waves. Data storage media may be any available media that can be accessed by one or more computers or one or more processors to retrieve instructions, codes, and / or data structures for implementing the techniques described in this application. A computer program product may include computer-readable media.

[0179] As an example and not limitation, such computer-readable storage media may include RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage, flash memory, or any other medium that can be used to store the desired program code in the form of instructions or data structures and can be accessed by a computer. Also, any connection is properly referred to as a computer-readable medium. For example, if instructions are transmitted from a website, server or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio and microwave, then the 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 actually directed to non-temporary tangible storage media. As used herein, disks and optical disks include compact disks (CDs), laser optical disks, optical optical disks, digital versatile disks (DVDs), and Blu-ray disks, where disks typically reproduce data magnetically, while optical disks reproduce data optically using lasers. Combinations of the above should also be included within the scope of computer-readable media.

[0180] Instructions may be executed by one or more processors, such as one or more digital signal processors (DSPs), general purpose microprocessors, application specific integrated circuits (ASICs), field programmable logic arrays (FPGAs), or other equivalent integrated or discrete logic circuits. Thus, the term "processor" as used herein may refer to any of the aforementioned structures or any other structures suitable for implementing the techniques described herein. Additionally, in some aspects, the functions described by the various illustrative logic blocks, modules, and steps described herein may be provided within dedicated hardware and / or software modules configured for encoding and decoding, or incorporated in a combined codec. Moreover, the techniques may be fully implemented in one or more circuits or logic elements.

[0181] The techniques of the present application may be implemented in a variety of devices or apparatuses, including a wireless handset, an integrated circuit (IC), or a set of ICs (e.g., a chipset). Various components, modules, or units are described in this application to emphasize functional aspects of devices for performing the disclosed techniques, but do not necessarily need to be implemented by different hardware units. In fact, as described above, the various units may be combined in an encoded hardware unit in conjunction with appropriate software and / or firmware, or provided by interoperating hardware units (including one or more processors as described above).

[0182] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the specific descriptions of the corresponding steps in the aforementioned method embodiments, and will not be repeated here.

[0183] It should be understood that in the description of the present application, unless otherwise specified, " / " indicates that the objects associated before and after are in an "or" relationship, for example, A / B can represent A or B; wherein A and B can be singular or plural. Also, in the description of the present application, unless otherwise specified, "multiple" refers to two or more than two. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b, or c can represent: a, b, c, ab, ac, bc, or abc, wherein a, b, c can be single or multiple. In addition, in order to facilitate the clear description of the technical solutions of the embodiments of the present application, in the embodiments of the present application, the words "first", "second", etc. are used to distinguish the same items or similar items with substantially the same functions and effects. Those skilled in the art can understand that the words "first", "second", etc. do not limit the quantity and execution order, and the words "first", "second", etc. do not limit them to be necessarily different. Meanwhile, in the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a concrete manner for ease of understanding.

[0184] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the division of the unit is only a logical function division, and there may be other division methods in actual implementation, for example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. The mutual coupling, direct coupling, or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0185] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0186] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function according to the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium or transmitted through the computer-readable storage medium. The computer instructions can be transmitted from a website site, computer, server or data center to another website site, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (digital subscriber line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that contains one or more available media integrations. The available medium may be a read-only memory (ROM), or a random access memory (RAM), or a magnetic medium, such as a floppy disk, a hard disk, a tape, a disk, or an optical medium, such as a digital versatile disc (DVD), or a semiconductor medium, such as a solid state disk (SSD), etc.

[0187] The above is only a specific implementation of the embodiment of the present application, but the protection scope of the embodiment of the present application is not limited thereto, and any changes or replacements within the technical scope disclosed in the embodiment of the present application should be included in the protection scope of the embodiment of the present application. Therefore, the protection scope of the embodiment of the present application should be based on the protection scope of the claims.

[0188] The device embodiments described above are merely illustrative, wherein the units and modules described as separate components may or may not be physically separated. In addition, some or all of the units and modules may be selected according to actual needs to achieve the purpose of the present embodiment. Those of ordinary skill in the art may understand and implement the present invention without creative effort.

[0189] The above is only a specific implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A method for distributing operating current of an energy storage device, characterized in that: A control device applied to an energy storage system, wherein the energy storage system further comprises a bus, N branches, at least one first energy storage device and at least one electrical device, wherein the N branches are connected in series with the bus, the N branches are connected in parallel, at least one branch comprises the first energy storage device, and at least one branch comprises the electrical device, wherein the method comprises: Obtaining the protection currents of the N branches, the load currents of the N branches, and the protection current of the bus; wherein the protection current is the maximum current value that the corresponding line can carry for safe operation, and the load current is the sum of the current values ​​generated by the electrical equipment on the corresponding line; Determine the total operating current of the at least one first energy storage device according to the protection current of the bus and the load current of the N branches, wherein the current value carried by the bus when the at least one first energy storage device operates according to the total operating current is not greater than the protection current of the bus; Determine a shunt ratio of the M branches according to the protection current and the load current of the M branches, wherein the shunt ratio is positively correlated with the protection current of the M branches, the M branches are branches including the first energy storage device among the N branches, and the shunt ratio is less than 1, M≤N; Calculating a first distributed current of the M branches according to the product of the total operating current and the current splitting ratio of the M branches; The operating current of the at least one first energy storage device is determined according to the first distributed currents of the M branches, and the operating current of the first energy storage device is not greater than the first distributed current of the branch to which the first energy storage device belongs.

2. The method according to claim 1, characterized in that The obtaining of the load currents of the N branches includes: Obtaining a branch current of a first target branch line, where the branch current is the sum of currents generated by a first energy storage device and an electric device running on the first target branch line, and the first target branch line is any one of the N branches; Determine a system state of the energy storage system, wherein the system state includes a charging state or a discharging state, wherein in the charging state, all first energy storage devices in the energy storage system are in a charging state, and in the discharging state, all first energy storage devices in the energy storage system are in a discharging state; If the system state is a charging state, obtaining a total charging current of the first target branch, wherein the total charging current is the sum of currents generated by charging of all running first energy storage devices on the first target branch; determining a load current of the first target branch according to a difference between a branch current of the first target branch and a total charging current of the first target branch; If the system state is a discharging state, a total discharging current of the first target branch is obtained, where the total discharging current is the sum of the currents generated by the discharging of all the first energy storage devices in operation on the first target branch; The load current of the first target branch is determined according to the sum of the branch current of the first target branch and the total discharge current of the first target branch.

3. The method according to claim 1, characterized in that The determining the total operating current of the at least one first energy storage device according to the protection current of the bus and the load currents of the N branches includes: Determine a system state of the energy storage system, wherein the system state includes a charging state or a discharging state, wherein in the charging state, all first energy storage devices in the energy storage system are in a charging state, and in the discharging state, all first energy storage devices in the energy storage system are in a discharging state; If the system state is a charging state, the total operating current is determined according to the difference between the protection current of the bus and the load current of the N branches; If the system state is a discharge state, determining a surplus power management strategy of the energy storage system, wherein the surplus power management strategy includes surfing the surplus power online or not surfing the surplus power online; If the surplus power management strategy is to connect the surplus power to the grid, the total operating current is determined according to the sum of the protection current of the bus and the load currents of the N branches; If the surplus power management strategy is that the surplus power is not connected to the grid, the total operating current is determined according to the load currents of the N branches.

4. The method according to claim 1, characterized in that The determining the shunt ratio of the M branches according to the protection current and the load current of the M branches, wherein the shunt ratio is positively correlated with the protection current of the M branches, includes: Determine a system state of the energy storage system, wherein the system state includes a charging state or a discharging state, wherein in the charging state, all first energy storage devices in the energy storage system are in a charging state, and in the discharging state, all first energy storage devices in the energy storage system are in a discharging state; If the system state is a charging state, the current diversion ratio of the second target branch is determined according to the proportion of the difference between the protection current of the second target branch and the load current of the second target branch in the difference between the protection current of the M branches and the load current of the M branches; the second target branch is any one of the M branches; If the system state is a discharge state, the diversion ratio of the second target branch is determined according to the proportion of the sum of the protection current of the second target branch and the load current of the second target branch in the sum of the protection current of the M branches and the load current of the M branches.

5. The method according to any one of claims 1 to 4, characterized in that: The step of determining the operating current of the at least one first energy storage device according to the first distributed currents of the M branches includes: Obtaining rated currents of all first energy storage devices on a second target branch line, where the second target branch line is any one of the M branches; The operating current of the target first energy storage device is determined according to the first distributed current of the second target branch and the proportion of the rated current of the target first energy storage device in the sum of the rated currents of at least one first energy storage device on the second target branch.

6. The method according to claim 5, characterized in that After determining the operating current of the at least one first energy storage device according to the first distributed currents of the M branches, the method further includes: Determine a maximum operating current of a second target branch line, where the maximum operating current is the current carried by the corresponding branch line when all first energy storage devices on the corresponding branch line operate according to the corresponding operating current, and the second target branch line is any one of the M branches; Obtaining the rated current of all first energy storage devices on the second target branch line; If the operating current of any one of the first energy storage devices on the second target branch line is greater than the corresponding rated current; then determining the second distributed current of the M branches according to the operating current and the rated current of the first energy storage device whose operating current is greater than the corresponding rated current; Obtaining the remaining carryable current of M-1 branches other than the second target branch, where the remaining carryable current is determined based on the difference between the protection current of the corresponding branch and the corresponding maximum operating current; If the remaining carryable current of any one of the M-1 branches is not less than the second allocated current, the operating current of all the first energy storage devices on the branch whose remaining carryable current is not less than the second allocated current is re-determined according to the current to be allocated.

7. The method according to claim 6, characterized in that If the remaining carryable current of any one of the M-1 branches is less than the second allocated current, the method further includes: Determine an allocated branch line from the M-1 branches, the allocated branch line being a branch line having the largest sum of rated currents of all corresponding first energy storage devices in the M-1 branches and a corresponding maximum operating circuit greater than a protection circuit; Re-determine the operating current of all first energy storage devices on the allocated branch line according to the first allocated current and the second allocated current of the allocated branch line; A new current to be distributed is determined based on the operating currents of all the first energy storage devices on the distributed branch line according to the second distributed current, and the step of determining the distributed branch line from the M-1 branches is repeated until the new current to be distributed is not greater than a preset threshold.

8. An operating current distribution device for an energy storage device, characterized in that: A method for distributing operating current of an energy storage device is used to perform the operation of the energy storage device, belonging to an energy storage system, wherein the energy storage system further comprises a bus, N branches, at least one first energy storage device and at least one electrical device, wherein the N branches are connected in series with the bus, the N branches are connected in parallel, at least one branch comprises a first energy storage device, and at least one branch comprises an electrical device, wherein the device comprises: An acquisition unit, used to acquire the protection currents of the N branches, the load currents of the N branches and the protection current of the bus; wherein the protection current is the maximum current value that the corresponding line can carry for safe operation, and the load current is the sum of the current values ​​generated by the electrical equipment on the corresponding line; A determination unit, configured to determine a total operating current of the at least one first energy storage device according to the protection current of the bus and the load currents of the N branches, wherein a current value carried by the bus when the at least one first energy storage device operates according to the total operating current is not greater than the protection current of the bus; a determining unit, configured to determine a shunt ratio of the M branches according to the protection current and the load current of the M branches, wherein the shunt ratio is positively correlated with the protection current of the M branches, the M branches are branches including the first energy storage device among the N branches, the shunt ratio is less than 1, and M≤N; a calculation unit, configured to calculate a first distributed current of the M branches according to a product of the total operating current and the current distribution ratio of the M branches; A determination unit is used to determine the operating current of the at least one first energy storage device according to the first distributed currents of the M branches, wherein the operating current of the first energy storage device is not greater than the first distributed current of the branch to which the first energy storage device belongs.

9. An electronic device, characterized in that: The method comprises a processor, a memory, a communication interface, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the processor, and the programs include instructions for executing the steps in the method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program for electronic data exchange, wherein the computer program causes a processor to execute the method according to any one of claims 1 to 7.

11. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the method according to any one of claims 1 to 7 is implemented.

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