Pressure equalization control method, system, device and medium for cascade energy storage system

Abstract

The present invention belongs to the field of energy storage, and specifically provides a voltage balancing control method, system, device and medium for a cascade energy storage system, comprising: step 1, obtaining a total starting current of a target cascade energy storage system; step 2, obtaining an initial distribution current of each level of a converter unit in the target cascade energy storage system according to the total starting current of the target cascade energy storage system; step 3, starting each converter unit in the target cascade energy storage system in sequence based on the initial distribution current and in combination with a predetermined time interval; during the starting process of each converter unit, adjusting the initial starting current of the next converter unit to be started according to the output voltage information of the currently started converter unit; the present invention can ensure that the starting process of the converter unit meets the power grid demand and takes into account the actual operating state of the system, thereby realizing voltage balancing control of each converter unit during the starting process.

Description

Technical Field

[0001] The present invention belongs to the field of energy storage, and in particular relates to a pressure equalization control method, system, equipment and medium of a cascade energy storage system. Background Art

[0002] A high-voltage direct-mounted cascade energy storage system generally refers to a cascade energy storage system / device that is directly connected to a high-voltage AC power grid, so that it can quickly respond to changes in grid frequency and voltage, and provide necessary adjustments to maintain the stability of the grid. A cascade energy storage system is composed of multiple cascade-connected energy storage units, and the operating state parameters of each cascaded energy storage unit may be different. How to control the voltage balancing of the cascade energy storage system to avoid capacitor voltage fluctuations generated at the moment of startup and in the case of grid instability, and to reduce the generation of negative sequence current and low-frequency current, has become an urgent problem to be solved. In the prior art, at the initial start-up of the cascade energy storage system, the energy storage unit is pre-charged through the battery management system to ensure that the energy storage unit reaches a relatively consistent state before startup. However, as the number of uses increases, the performance of the energy storage battery in the energy storage unit will gradually decrease, resulting in differences in the capacity of different energy storage units, and the influence of other factors will cause the actual working state of the energy storage unit to be different during the startup process, so it is impossible to ensure that the voltage balancing of each energy storage unit is still achieved during and after the startup process. Summary of the invention

[0003] The purpose of the present invention is to provide a voltage equalization control method, system, equipment and medium for a cascade energy storage system, which solves the technical problem that the existing cascade energy storage system is prone to capacitor voltage fluctuations at the moment of startup and when the power grid is unstable, and increases the generation of negative sequence current and low-frequency current.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is:

[0005] The voltage sharing control method of the cascade energy storage system provided by the present invention comprises the following steps:

[0006] Step 1, obtaining the total starting current of the target cascade energy storage system;

[0007] Step 2, according to the total startup current of the target cascade energy storage system, obtaining the initial distribution current of each stage of the converter unit in the target cascade energy storage system;

[0008] Step 3, based on the initial distribution current, start each converter unit in the target cascade energy storage system in sequence in combination with a predetermined time interval; during the startup process of each converter unit, adjust the initial startup current of the next converter unit to be started according to the output voltage information of the currently started converter unit to achieve voltage sharing control of the cascade energy storage system.

[0009] Preferably, in step 1, the total startup current of the target cascade energy storage system is obtained by:

[0010] Obtain the current apparent power of the target cascade energy storage system corresponding to the power grid;

[0011] According to the obtained apparent power, combined with the efficiency corresponding to the target cascade energy storage system, the apparent power corresponding to the target cascade energy storage system is obtained;

[0012] According to the apparent power corresponding to the target cascade energy storage system and in combination with a preset DC bus starting voltage, the total starting current corresponding to the target cascade energy storage system is obtained.

[0013] Preferably, the current apparent power of the target cascade energy storage system corresponding to the power grid is obtained by:

[0014] Obtain the current total power demand and power factor of the target cascade energy storage system corresponding to the power grid;

[0015] The current apparent power of the target cascade energy storage system corresponding to the power grid is obtained according to the obtained total power demand and power factor.

[0016] Preferably, in step 2, the initial distribution current of each stage of the commutation unit in the target cascade energy storage system is obtained according to the total startup current of the target cascade energy storage system, and the specific method is:

[0017] The target cascade energy storage system includes energy storage units, each of which is provided with the same number of commutation units; the rated current of each commutation unit is set to be the same, and the initial distribution current of each commutation unit is calculated by the following formula:

[0018]

[0019] in, Initial distribution current for each commutation unit; is the total starting current of the target cascade energy storage system.

[0020] Preferably, in step 3, the predetermined time interval is obtained by the following formula:

[0021]

[0022] in, Indicates the time interval, represents the total time required for the target cascade energy storage system to complete startup; Indicates the time required for each commutation unit to stabilize; represents the redundancy coefficient; is the number of energy storage units.

[0023] Preferably, in step 3, during the startup process of each commutation unit, the initial startup current of the next commutation unit to be started is adjusted according to the output voltage information of the currently started commutation unit, and the specific method is:

[0024] Obtain the output voltage of the current starting commutation unit;

[0025] Calculate the adjustment factor based on the obtained output voltage;

[0026] The initial distribution current of the next commutation unit to be started is adjusted according to the obtained adjustment factor.

[0027] Preferably, the adjustment factor is calculated in combination with the obtained output voltage according to the following formula:

[0028]

[0029] in, is the adjustment factor; Indicates the deviation between the output voltage of the currently started commutation unit and the reference voltage: Represents the coefficient used to adjust the voltage deviation sensitivity; Indicates the target balanced voltage; Indicates the benchmark adjustment ratio.

[0030] The pressure equalization control system of the cascade energy storage system includes:

[0031] A starting total current acquisition unit, used to acquire the starting total current of the target cascade energy storage system;

[0032] An initial distribution current acquisition unit, used to obtain an initial distribution current of each stage of the commutation unit in the target cascade energy storage system according to the total startup current of the target cascade energy storage system;

[0033] A current adjustment unit is used to start each converter unit in the target cascade energy storage system in sequence based on the initial distributed current and in combination with a predetermined time interval; during the startup process of each converter unit, the initial startup current of the next converter unit to be started is adjusted according to the output voltage information of the currently started converter unit.

[0034] A computer device comprising:

[0035] a processor suitable for executing a computer program;

[0036] A computer-readable storage medium stores a computer program, and when the computer program is executed by the processor, the method described is performed.

[0037] A computer-readable storage medium stores a computer program, wherein the computer program implements the method when executed by a processor.

[0038] Compared with the prior art, the present invention has the following beneficial effects:

[0039] The voltage balancing control method for the cascade energy storage system provided by the present invention adjusts the initial starting current of the next starting converter unit according to the output voltage information fed back by the converter unit, so that the converter unit with a higher voltage reduces the current and the converter unit with a lower voltage increases the current. This can ensure that the starting process of the converter unit meets the needs of the power grid and takes into account the actual operating status of the system, thereby achieving voltage balancing control of each converter unit during the starting process. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a flow chart of the present invention. DETAILED DESCRIPTION

[0041] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0042] It should be understood that when used in the present specification and the appended claims, the term "comprising" indicates the presence of described features, wholes, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or combinations thereof.

[0043] It should also be understood that the term “and / or” used in the specification and appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0044] As used in the specification and appended claims of this application, the term "if" can be interpreted as "when" or "uponce" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrase "if it is determined" or "if [described condition or event] is detected" can be interpreted as meaning "uponce it is determined" or "in response to determining" or "uponce [described condition or event] is detected" or "in response to detecting [described condition or event]", depending on the context.

[0045] In addition, in the description of the present application specification and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish the descriptions and cannot be understood as indicating or implying relative importance.

[0046] References to "one embodiment" or "some embodiments" etc. described in the specification of this application mean that one or more embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0047] Example 1

[0048] like Figure 1 As shown, this embodiment provides a voltage equalization control method for a cascade energy storage system, wherein the cascade energy storage system is connected to a power grid, and the cascade energy storage system includes at least N cascade-connected energy storage units, each energy storage unit includes at least a number of energy storage batteries connected in series, and the energy storage batteries at the end are connected to a converter unit.

[0049] Specifically, the following steps are included:

[0050] Step 1, obtaining the total starting current of the cascade energy storage system;

[0051] Step 2, according to the total startup current of the cascade energy storage system, obtaining the initial distribution current of each stage of the commutation unit in the cascade energy storage system;

[0052] Step 3, based on the initial distribution current, start each commutation unit in sequence at a predetermined time interval; during the sequential starting process, adjust the initial starting current of the next commutation unit to be started according to the output voltage information fed back by the currently started commutation unit.

[0053] This embodiment adjusts the initial starting current of the next converter unit to be started according to the output voltage information fed back by the converter unit, so that the converter unit with a higher voltage reduces the current and the converter unit with a lower voltage increases the current. This can ensure that the starting process of the converter unit meets the needs of the power grid and takes into account the actual operating status of the system, thereby achieving voltage equalization control of each converter unit during the starting process.

[0054] Example 2

[0055] Based on Example 1, this embodiment provides a voltage sharing control method for a cascade energy storage system. In step 1, a total startup current of the cascade energy storage system is obtained, wherein the total startup current can be estimated based on current operating parameters of the power grid and state parameters of the cascade energy storage system. Specifically:

[0056] S11. Obtain the total power demand of the power grid at the current moment and the power factor of the power grid. The total power demand usually refers to the total active power demand, and the power factor is used to represent the ratio of active power to apparent power. According to the total power demand of the power grid at the current moment and the power factor of the power grid, the current apparent power of the power grid is obtained:

[0057]

[0058] in, Indicates the current apparent power of the power grid, represents the total power demand of the power grid at the current moment, Indicates the power factor of the power grid.

[0059] S12. According to the current apparent power of the power grid and the efficiency of the cascade energy storage system, the apparent power required by the cascade energy storage system is obtained:

[0060]

[0061] in, represents the apparent power required by the cascade energy storage system, Represents the efficiency of the cascade energy storage system.

[0062] S13. According to the apparent power required by the cascade energy storage system and the preset DC bus starting voltage, the total starting current of the cascade energy storage system is obtained:

[0063]

[0064] in, Represents the total starting current of the cascade energy storage system, It represents the preset DC bus starting voltage, which can be preset according to the design and operation parameters of the power grid and the cascade energy storage system.

[0065] In step 2, the initial distribution current of each level of the cascade energy storage system is obtained according to the total starting current of the cascade energy storage system. Each energy storage unit has the same number of converter units, and the rated current of all converter units is the same, so the initial distribution current of each converter unit is It can be calculated according to the following formula:

[0066]

[0067] In step 3, based on the initial distribution current, each commutation unit is started in turn at a predetermined time interval. The time interval is set based on the starting parameters of each commutation unit and the starting parameters of the cascade energy storage system as a whole:

[0068]

[0069] in, Indicates the time interval, Indicates the total time required for the entire cascade energy storage system to complete startup, which can be determined based on the performance requirements of the cascade energy storage system design, for example, it can be the time limit within which the cascade energy storage system must be fully started and reach full power output; It represents the time required for a single commutation unit to stabilize. It is assumed here that the time required for all commutation units to start and stabilize is the same; Represents the redundancy factor, which is usually greater than 1 to take into account additional safety buffers and other potential delay factors.

[0070] In step 3, during the sequential starting process, the initial starting current of the next starting commutation unit is adjusted according to the output voltage information fed back by the commutation unit.

[0071] After the first commutation unit is started, the output voltage of the currently started commutation unit is obtained; the adjustment factor is calculated based on the output voltage, and the initial distribution current of the next commutation unit is adjusted based on the adjustment factor, so that the commutation unit with higher voltage reduces the current and the commutation unit with lower voltage increases the current. Adjustment factor It can be calculated based on the following formula:

[0072]

[0073] in, Indicates the deviation between the output voltage of the currently started commutation unit and the reference voltage: , Indicates the output voltage of the currently started commutation unit, Indicates the target balanced voltage, i.e., sets the voltage of all converter units close to or equal to a common reference voltage; It represents the coefficient used to adjust the voltage deviation sensitivity. The coefficient 𝛼 can be set according to the system's response speed and stability requirements for voltage balancing. A larger 𝛼 value can speed up the voltage balancing, but it may also cause system oscillation. It represents the reference adjustment ratio, which can usually be set to 1 to ensure that the adjustment factor is within a reasonable range. The initial distribution current of the next commutation unit is adjusted according to the adjustment factor. The initial distribution current of the next commutation unit can be obtained by the following formula: :

[0074]

[0075] In actual applications, as time goes by and the number of times used increases, the performance of the energy storage battery in the energy storage unit will gradually decline, resulting in differences in voltage and capacity of different energy storage units, and the influence of other factors will cause different actual working conditions of the energy storage units. The initial starting current of the next starting converter unit is adjusted according to the voltage information fed back by the converter unit, so that the converter unit with higher voltage reduces the current and the converter unit with lower voltage increases the current. This can ensure that the starting process of the converter unit meets the needs of the power grid and takes into account the actual operating status of the system, thereby realizing voltage balancing control of each converter unit during the startup process.

[0076] In summary, this embodiment relates to a voltage balancing control method for a cascaded energy storage system, which adjusts the initial starting current of the next converter unit to be started according to the output voltage information fed back by the converter unit, so that the converter unit with a higher voltage reduces the current and the converter unit with a lower voltage increases the current. This can ensure that the starting process of the converter unit meets the needs of the power grid and takes into account the actual operating status of the system, thereby achieving voltage balancing control of each converter unit during the startup process.

[0077] Example 2

[0078] The pressure-sharing control system of the cascade energy storage system provided in this embodiment includes:

[0079] The startup total current acquisition unit is used to acquire the startup total current of the target cascade energy storage system, specifically:

[0080] Obtain the total power demand and power factor of the power grid at the current moment. The total power demand usually refers to the total active power demand, and the power factor is used to indicate the ratio of active power to apparent power.

[0081] The current apparent power of the power grid is obtained based on the total power demand of the power grid at the current moment and the power factor of the power grid:

[0082]

[0083] in, Indicates the current apparent power of the power grid, represents the total power demand of the power grid at the current moment, Indicates the power factor of the power grid.

[0084] According to the current apparent power of the power grid and the efficiency of the cascade energy storage system, the apparent power required by the cascade energy storage system is obtained:

[0085]

[0086] in, represents the apparent power required by the cascade energy storage system, Represents the efficiency of the cascade energy storage system.

[0087] According to the apparent power required by the cascade energy storage system and the preset DC bus starting voltage, the total starting current of the cascade energy storage system is obtained:

[0088]

[0089] in, Represents the total starting current of the cascade energy storage system, It represents the preset DC bus starting voltage, which can be preset according to the design and operation parameters of the power grid and the cascade energy storage system.

[0090] The initial distribution current acquisition unit is used to obtain the initial distribution current of each level of the commutation unit in the target cascade energy storage system according to the total startup current of the target cascade energy storage system, specifically:

[0091] Typically, based on the cascade energy storage system, Each energy storage unit has the same number of converter units, and the rated current of all converter units is the same, so the initial distribution current of each converter unit is It can be calculated according to the following formula:

[0092] .

[0093] A current adjustment unit is used to start each commutation unit in the target cascade energy storage system in sequence based on the initial distribution current and in combination with a predetermined time interval; during the startup process of each commutation unit, the initial startup current of the next commutation unit to be started is adjusted according to the output voltage information of the currently started commutation unit, wherein:

[0094] After the first commutation unit is started, the output voltage of the currently started commutation unit is obtained; the adjustment factor is calculated based on the output voltage, and the initial distribution current of the next commutation unit is adjusted based on the adjustment factor, so that the commutation unit with higher voltage reduces the current and the commutation unit with lower voltage increases the current. Adjustment factor It can be calculated based on the following formula:

[0095]

[0096] in, Indicates the deviation between the output voltage of the currently started commutation unit and the reference voltage: , Indicates the output voltage of the currently started commutation unit, Indicates the target balanced voltage, i.e., sets the voltage of all converter units close to or equal to a common reference voltage; It represents the coefficient used to adjust the voltage deviation sensitivity. The coefficient 𝛼 can be set according to the system's response speed and stability requirements for voltage balancing. A larger 𝛼 value can speed up the voltage balancing, but it may also cause system oscillation. It represents the reference adjustment ratio, which can usually be set to 1 to ensure that the adjustment factor is within a reasonable range. The initial distribution current of the next commutation unit is adjusted according to the adjustment factor. The initial distribution current of the next commutation unit can be obtained by the following formula: :

[0097] .

[0098] Example 3

[0099] This embodiment 3 provides a computer device, including: a memory for storing a computer program; and a processor for implementing the steps of a computer method when executing the computer program.

[0100] When the processor executes the computer program, the steps of the above computer method are implemented.

[0101] Alternatively, when the processor executes the computer program, the functions of each module in the above system are realized.

[0102] The computer device may be a computing device such as a desktop computer, a notebook, a PDA, and a cloud server. The computer device may include, but is not limited to, a processor and a memory. Those skilled in the art will appreciate that the above are examples of computer devices and do not constitute a limitation on computer devices. The computer device may include more components than the above, or a combination of certain components, or different components. For example, the computer device may also include input and output devices, network access devices, buses, etc.

[0103] The processor may be a central processing unit (CPU), other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc. The processor is the control center of the computer device, and uses various interfaces and lines to connect various parts of the entire computer device.

[0104] The memory may be used to store the computer programs and / or modules, and the processor implements various functions of the computer device by running or executing the computer programs and / or modules stored in the memory and calling the data stored in the memory.

[0105] The memory may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required for at least one function (such as a sound playback function, an image playback function, etc.), etc.; the data storage area may store data created according to the use of the mobile phone (such as audio data, a phone book, etc.), etc. In addition, the memory may include a high-speed random access memory, and may also include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart memory card (SmartMediaCard, SMC), a secure digital (SecureDigital, SD) card, a flash card (FlashCard), at least one disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0106] Example 4

[0107] This embodiment 4 also provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, the steps of the method described are implemented.

[0108] If the module / unit integrated in the computer system is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium.

[0109] Based on such understanding, the present invention implements all or part of the processes in the above method, and can also be completed by instructing related hardware through a computer program, and the computer program can be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the above computer method can be implemented. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or preset intermediate form, etc.

[0110] The computer-readable storage medium may include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal and software distribution medium, etc.

[0111] It should be noted that the content contained in the computer-readable storage medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable storage media do not include electrical carrier signals and telecommunication signals.

[0112] Example 5

[0113] This embodiment 5 provides a computer product, which includes a computer program, and the computer program is stored in a computer-readable storage medium; the processor of the computer device reads the computer program from the computer-readable storage medium, and the processor executes the computer program, so that the computer device can execute the method in embodiment 1, which will not be repeated here.

[0114] It should be noted that a person of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be implemented by instructing related hardware through a computer program. The program can be stored in a computer-readable storage medium. When the program is executed, it can include the processes of the embodiments of the above-mentioned methods.

[0115] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A voltage-sharing control method for a cascade energy storage system, characterized in that: The following steps are involved: Step 1, obtaining the total starting current of the target cascade energy storage system; Step 2, according to the total startup current of the target cascade energy storage system, obtaining the initial distribution current of each stage of the converter unit in the target cascade energy storage system; Step 3, based on the initial distribution current, each converter unit in the target cascade energy storage system is started in sequence in combination with a predetermined time interval; During the startup process of each commutation unit, the initial startup current of the next commutation unit to be started is adjusted according to the output voltage information of the currently started commutation unit, so as to realize the voltage equalization control of the cascade energy storage system; During the startup process of each commutation unit, the initial startup current of the next commutation unit to be started is adjusted according to the output voltage information of the currently started commutation unit. The specific method is: Obtain the output voltage of the current starting commutation unit; Calculate the adjustment factor based on the obtained output voltage; Adjusting the initial distribution current of the next commutation unit to be started according to the obtained adjustment factor; Combined with the obtained output voltage, the adjustment factor is calculated: in, is the adjustment factor; Indicates the deviation between the output voltage of the currently started commutation unit and the target balanced voltage: Represents the coefficient used to adjust the voltage deviation sensitivity; Indicates the target balanced voltage; Indicates the benchmark adjustment ratio.

2. The voltage-sharing control method for a cascade energy storage system according to claim 1, characterized in that: In step 1, the total starting current of the target cascade energy storage system is obtained by: Obtain the current apparent power of the target cascade energy storage system corresponding to the power grid; According to the obtained apparent power, combined with the efficiency corresponding to the target cascade energy storage system, the apparent power corresponding to the target cascade energy storage system is obtained; According to the apparent power corresponding to the target cascade energy storage system and in combination with a preset DC bus starting voltage, the total starting current corresponding to the target cascade energy storage system is obtained.

3. The voltage-sharing control method for a cascade energy storage system according to claim 2, characterized in that: The current apparent power of the target cascade energy storage system corresponding to the grid is obtained by: Obtain the current total power demand and power factor of the target cascade energy storage system corresponding to the power grid; The current apparent power of the target cascade energy storage system corresponding to the power grid is obtained according to the obtained total power demand and power factor.

4. The voltage-sharing control method for a cascade energy storage system according to claim 1, characterized in that: In step 2, according to the total startup current of the target cascade energy storage system, the initial distribution current of each stage of the commutation unit in the target cascade energy storage system is obtained, and the specific method is: The target cascade energy storage system includes energy storage units, each of which is provided with the same number of commutation units; the rated current of each commutation unit is set to be the same, and the initial distribution current of each commutation unit is calculated by the following formula: in, Initial distribution current for each commutation unit; is the total starting current of the target cascade energy storage system.

5. The voltage-sharing control method for a cascade energy storage system according to claim 1, characterized in that: In step 3, the predetermined time interval is obtained by the following formula: in, Indicates the time interval, represents the total time required for the target cascade energy storage system to complete startup; Indicates the time required for each commutation unit to stabilize; represents the redundancy coefficient; is the number of energy storage units.

6. A pressure-balanced control system for a cascade energy storage system, characterized in that: include: A starting total current acquisition unit, used to acquire the starting total current of the target cascade energy storage system; An initial distribution current acquisition unit, used to obtain an initial distribution current of each stage of the commutation unit in the target cascade energy storage system according to the total startup current of the target cascade energy storage system; A current adjustment unit, configured to sequentially start each commutation unit in the target cascade energy storage system based on the initial distribution current and in combination with a predetermined time interval; During the startup process of each commutation unit, the initial startup current of the next commutation unit to be started is adjusted according to the output voltage information of the currently started commutation unit; During the startup process of each commutation unit, the initial startup current of the next commutation unit to be started is adjusted according to the output voltage information of the currently started commutation unit. The specific method is: Obtain the output voltage of the current starting commutation unit; Calculate the adjustment factor based on the obtained output voltage; Adjusting the initial distribution current of the next commutation unit to be started according to the obtained adjustment factor; Combined with the obtained output voltage, the adjustment factor is calculated: in, is the adjustment factor; Indicates the deviation between the output voltage of the currently started commutation unit and the target balanced voltage: Represents the coefficient used to adjust the voltage deviation sensitivity; Indicates the target balanced voltage; Indicates the benchmark adjustment ratio.

7. A computer device, characterized in that: include: a processor suitable for executing a computer program; A computer-readable storage medium, wherein a computer program is stored in the computer-readable storage medium, and when the computer program is executed by the processor, the method according to any one of claims 1 to 5 is performed.

8. A computer-readable storage medium storing 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 5 is implemented.

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