Energy storage system, starting control method of energy storage system and electronic equipment

Abstract

The invention provides an energy storage system, a starting control method of the energy storage system and electronic equipment, the energy storage system comprises a main control unit and a plurality of battery cluster units, the main control unit is used for sending a pre-charging control instruction to each sub-control unit to control a battery cluster to pre-charge a DC / DC converter through a pre-charging control circuit; and an output voltage control instruction is sent to each sub-control unit, and after each DC / DC converter controls the output voltage of the DC / DC converter to be adjusted to the target output voltage based on the output voltage control instruction, the main control unit sends a start control instruction to each sub-control unit. According to the invention, all the battery clusters are simultaneously connected with the positive and negative buses, rapid starting of the energy storage system is realized, and the circulating current problem is solved.

Description

Technical Field

[0001] The present application relates to the field of energy storage, and in particular to an energy storage system, a startup control method of the energy storage system, and an electronic device. Background Art

[0002] In the field of new energy storage, the energy and power output of a single battery or battery cluster is limited. By connecting multiple battery clusters in parallel, the total energy storage capacity and output power of the system can be significantly increased, thus meeting the needs of large-scale energy storage applications, such as grid regulation, peak and valley electricity price applications, etc.

[0003] However, there will be circulation between parallel battery clusters. In order to solve the problems of system performance degradation and cost increase caused by circulation, a DC / DC converter is often introduced at the output end of the battery cluster to reduce the voltage difference between clusters through the DC / DC converter, thereby solving the circulation problem. In the related art, the battery clusters are started in sequence for pre-charging, and then each DC / DC converter is started in sequence, so the startup speed of the energy storage system is slow. Summary of the invention

[0004] Based on this, it is necessary to provide an energy storage system, a startup control method of the energy storage system and an electronic device to address the above technical problems, so as to increase the startup speed of the energy storage system and solve the circulation problem.

[0005] In a first aspect, an embodiment of the present application provides an energy storage system, including a main control unit and a plurality of battery cluster units, wherein the battery cluster unit includes a sub-control unit, a battery cluster, a pre-charge control circuit, a DC / DC converter, a first contactor and a second contactor, wherein the first contactor is connected between the positive electrode of the battery cluster and the DC / DC converter, the pre-charge control circuit is connected in parallel with the first contactor, and the second contactor is connected between the negative electrode of the battery cluster and the DC / DC converter; wherein,

[0006] The main control unit is used to send a pre-charge control instruction to each of the sub-control units to control the battery cluster to pre-charge the DC / DC converter through the pre-charge control circuit; and send an output voltage control instruction to each of the sub-control units, and after each of the DC / DC converters controls its own output voltage to adjust to the target output voltage based on the output voltage control instruction, the main control unit sends a start control instruction to each of the sub-control units.

[0007] In some embodiments, before sending the pre-charge control instruction, the main control unit sends a first voltage acquisition instruction to each of the sub-control units to instruct the sub-control unit to acquire the first voltage of the corresponding battery cluster;

[0008] The output voltage control instruction includes the target output voltage, and the target output voltage is greater than a maximum voltage among the first voltages.

[0009] In some embodiments, the target output voltage V out The following relationship is satisfied:

[0010] V out =V rack_max +η*△V DC

[0011] Among them, V rack_max Indicates the maximum voltage, △V DC represents the starting voltage difference of the DC / DC converter, η represents the adjustment coefficient, and η≥1.

[0012] In some embodiments, the main control unit sends a second voltage acquisition instruction to each of the sub-control units before sending the output voltage control instruction, so as to instruct the sub-control unit to acquire the pre-charge voltage of the output end of the corresponding pre-charge control circuit;

[0013] When the main control unit determines that the pre-charge voltages at the output ends of the pre-charge control circuits have reached the minimum voltage among the first voltages, it sends an output voltage control instruction.

[0014] In some embodiments, the main control unit sends a third voltage acquisition instruction to each of the sub-control units before sending the start control instruction, so as to instruct the sub-control unit to acquire the output voltage of the corresponding DC / DC converter output terminal;

[0015] When the main control unit determines that the output voltages of the output terminals of each of the DC / DC converters have reached the target output voltage, the main control unit sends the start control instruction.

[0016] In some embodiments, the main control unit sends the start-up control instruction to each of the sub-control units to instruct the sub-control unit to control the first contactor to be turned on for a preset time and then control the pre-charging control circuit to be turned off.

[0017] In some embodiments, the pre-charge control circuit includes a third contactor and a pre-charge resistor connected in series; the sub-control unit controls the third contactor to be turned on or off to control the pre-charge control circuit to be turned on or off.

[0018] In some embodiments, the energy storage system further includes an energy storage converter;

[0019] The main control unit sends a pre-charge control instruction to each of the sub-control units to instruct the sub-control units to control the pre-charge control circuit and the second contactor to be turned on, so as to control the battery cluster to pre-charge the DC / DC converter and the energy storage converter.

[0020] In a second aspect, an embodiment of the present application provides a startup control method for an energy storage system, which is applied to the energy storage system as described in the first aspect, and the method includes:

[0021] Sending a pre-charge control instruction to each of the sub-control units to control the battery cluster to pre-charge the DC / DC converter through the pre-charge control circuit;

[0022] After the pre-charging is completed, an output voltage control instruction is sent to each of the sub-control units to control the output voltage of each of the DC / DC converters;

[0023] After each of the DC / DC converters controls its own output voltage to adjust to the target output voltage based on the output voltage control instruction, a start control instruction is sent to each of the sub-control units.

[0024] In a third aspect, an embodiment of the present application proposes an electronic device, comprising a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the method described in the second aspect when executing the computer program.

[0025] This application has the following technical effects:

[0026] After the main control unit controls all battery clusters to pre-charge the output capacitors at the same time, it controls all DC / DC converters to adjust the output voltage to the target output voltage, and finally sends a start-up control instruction to control all battery clusters to be connected to the grid at the same time, so as to achieve rapid start-up of the energy storage system and solve the circulation problem.

[0027] After the main control unit controls the DC / DC converter to start and adjust to the target output voltage, it sends a start-up control instruction to control each battery cluster to be connected to the grid. The grid-connected and off-grid switching switch between the DC / DC converter and the positive and negative busbars can be omitted, saving system hardware costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic diagram of the structure of an energy storage system provided in one embodiment of the present application;

[0029] Figure 2 A schematic diagram of a communication architecture of an energy storage system provided in one embodiment of the present application;

[0030] Figure 3 A circuit diagram of a DC / DC converter provided in one embodiment of the present application;

[0031] Figure 4 A schematic diagram of a flow chart of a startup control method for an energy storage system provided in one embodiment of the present application;

[0032] Figure 5 A schematic diagram of the overall process of a startup control method for an energy storage system provided in one embodiment of the present application. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is described and illustrated below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. Based on the embodiments provided in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application. In addition, it can also be understood that although the efforts made in this development process may be complex and lengthy, for ordinary technicians in the field related to the contents disclosed in the present application, some changes such as design, manufacturing or production based on the technical contents disclosed in the present application are only conventional technical means, and should not be understood as insufficient contents disclosed in the present application.

[0034] Reference to "embodiments" in this application 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 of ordinary skill in the art that the embodiments described in this application may be combined with other embodiments without conflict.

[0035] Unless otherwise defined, the technical terms or scientific terms involved in this application should be understood by people with ordinary skills in the technical field to which this application belongs. The words "one", "a", "a", "the" and the like involved in this application do not indicate a quantitative limitation, and may represent the singular or plural. The terms "include", "comprise", "have" and any of their variations involved in this application are intended to cover non-exclusive inclusions; for example, a process, method, system, product or device that includes a series of steps or modules (units) is not limited to the listed steps or units, but may also include steps or units that are not listed, or may also include other steps or units inherent to these processes, methods, products or devices. The words "connect", "connected", "coupled" and the like involved in this application are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The "multiple" involved in this application refers to greater than or equal to two. "And / or" describes the association relationship of associated objects, indicating that there can be three relationships, for example, "A and / or B" can represent: A exists alone, A and B exist at the same time, and B exists alone. The terms "first", "second", "third" and the like involved in the present application are merely used to distinguish similar objects and do not represent a specific ordering of the objects.

[0036] Figure 1 This is a schematic diagram of the structure of the energy storage system provided in the embodiment of the present application. Figure 1 As shown, the energy storage system includes a main control unit ( Figure 1 ) and a plurality of battery cluster units 100, the battery cluster unit 100 including a sub-control unit ( Figure 1 The first contactor KM1 is connected between the positive electrode of the battery cluster 101 and the DC / DC converter 103, the pre-charge control circuit 102 is connected in parallel with the first contactor KM1, the output end of the DC / DC converter 103 is connected to the positive bus and the negative bus, and the second contactor KM3 is connected between the negative electrode of the battery cluster 101 and the DC / DC converter 103.

[0037] like Figure 3 As shown, the DC / DC converter 103 includes a DC / DC controller (not shown in the figure) and an output capacitor C1 , and the DC / DC controller is used to control the output voltage of the DC / DC converter 103 .

[0038] like Figure 2As shown, the main control unit BAU is communicatively connected to each sub-control unit (BCU-1, ..., BCU-N), and each sub-control unit (BCU-1, ..., BCU-N) is respectively communicatively connected to the DC / DC controller of its corresponding DC / DC converter, for example, via a CAN bus communication connection.

[0039] The main control unit BAU is used to send pre-charge control instructions, output voltage control instructions, start control instructions, first voltage acquisition instructions, second voltage acquisition instructions, and third voltage acquisition instructions to each sub-control unit (BCU-1, ..., BCU-N) to instruct each sub-control unit (BCU-1, ..., BCU-N) to control the conduction or disconnection of the first contactor KM1, the second contactor KM3, and the pre-charge control circuit 102, and also instruct each sub-control unit (BCU-1, ..., BCU-N) to collect the voltage at the corresponding position, etc.

[0040] In addition to uploading the collected voltage to the main control unit BAU, the sub-control unit (BCU-1, ..., BCU-N) can also send output voltage control instructions to the DC / DC controller to instruct the DC / DC controller to adjust the output voltage of the DC / DC converter.

[0041] In some embodiments, the pre-charge control circuit 102 includes a third contactor KM2 and a pre-charge resistor Rc connected in series. The third contactor KM2 is used to control the pre-charge control circuit 102 to be turned on or off.

[0042] In some embodiments, Figure 3 As shown, the DC / DC converter 103 may also include an inductor L1, a first switching element Q1, a second switching element Q2, and a DC / DC controller connected to the first switching element Q1 and the second switching element Q2. The DC / DC controller controls the switching frequency of the first switching element Q1 and the second switching element Q2 to achieve voltage conversion for the output voltage of the battery cluster.

[0043] In some embodiments, the energy storage system may further include circuit breakers CB1, CB2, fuses FU, and shunt RS. The circuit breakers CB and fuses FU may be disconnected in time when a fault occurs in the energy storage system to protect other circuit components. The sub-control units (BCU-1, ..., BCU-N) may measure the loop current by detecting the voltage across the shunt RS.

[0044] In some embodiments, Figure 1As shown, the energy storage system also includes an energy storage converter 104, which includes a DC / AC converter and an input capacitor Cin, and the input capacitor Cin is connected between the positive bus, the negative bus and the DC / AC converter. The DC / AC converter is used to convert the voltage of the bus into AC power for connection to the power grid; it is also used to convert the AC power of the power grid into DC power for charging the battery cluster.

[0045] Based on the above energy storage system, the present application embodiment proposes a startup control method of the energy storage system, which is applied to the main control unit BAU of the energy storage system, such as Figure 4 As shown, the following steps are included:

[0046] S402: Sending a pre-charge control instruction to each of the sub-control units to control the battery cluster to pre-charge the DC / DC converter through the pre-charge control circuit.

[0047] After receiving the pre-charge control instruction, each sub-control unit (BCU-1, ..., BCU-N) controls the third contactor KM2 in the pre-charge control circuit 102 to be turned on and the second contactor KM3 to be turned on. At this time, the battery cluster 101, the pre-charge control circuit 102, the DC / DC converter 103, and the positive and negative busbars are turned on to form a loop, and the battery cluster 101 pre-charges the output capacitor C1 so that the voltage of the output capacitor C1 is raised to a certain value to increase the starting speed of the DC / DC converter. At the same time, the pre-charge control circuit 102 includes a pre-charge resistor Rc. Due to the current limiting effect of the pre-charge resistor Rc, the circulating current between the battery clusters can be reduced.

[0048] If the energy storage system further includes an energy storage converter 104 , the battery cluster pre-charges the output capacitor C1 and the input capacitor Cin at the same time to increase the startup speed of the DC / DC converter and the DC / AC converter.

[0049] S404: After the pre-charging is completed, an output voltage control instruction is sent to each of the sub-control units to control the output voltage of each of the DC / DC converters.

[0050] The output voltage control instruction includes a target output voltage. The sub-control units (BCU-1, ..., BCU-N) send the output voltage control instruction to each DC / DC converter, and the DC / DC converter controls its own output voltage to adjust to the target output voltage based on the output voltage control instruction.

[0051] After receiving the output voltage control command, each DC / DC converter starts at the same time, and adjusts its output voltage to the target output voltage by controlling the frequency of the switching element. After the adjustment is completed, the output voltage of each DC / DC converter is the same, and even if the voltage difference between the battery clusters is large, the circulation between the battery clusters can be avoided.

[0052] S406: After each of the DC / DC converters controls its own output voltage to adjust to the target output voltage based on the output voltage control instruction, a start control instruction is sent to each of the sub-control units.

[0053] After receiving the start control instruction, each sub-control unit (BCU-1, ..., BCU-N) controls the third contactor KM2 in the pre-charge control circuit 102 to be disconnected and the first contactor KM1 to be turned on, so as to realize the grid connection of each battery cluster.

[0054] In this embodiment, after the main control unit controls all battery clusters to pre-charge the output capacitors at the same time, it controls all DC / DC converters to adjust the output voltage to the target output voltage, and finally sends a start control instruction to control all battery clusters to be connected to the grid at the same time, thereby realizing a rapid start of the energy storage system; at the same time, the circulating current between the parallel battery clusters is eliminated.

[0055] It should be further explained that in the related art, the main control unit controls the first contactor to be turned on before starting the DC / DC converter, so in the hardware circuit, it is necessary to add an on-grid and off-grid switching switch between the DC / DC converter and the positive and negative busbars. In this embodiment, the main control unit controls the first contactor to be turned on after the DC / DC converter is started, and the on-grid and off-grid switching switch can be omitted, saving the system hardware cost.

[0056] In some embodiments, before sending a pre-charge control instruction to each sub-control unit (BCU-1, ..., BCU-N), the main control unit BAU sends a first voltage acquisition instruction to each sub-control unit (BCU-1, ..., BCU-N) to instruct the sub-control unit (BCU-1, ..., BCU-N) to acquire the first voltage of the corresponding battery cluster.

[0057] After receiving the first voltage acquisition instruction, the sub-control unit (BCU-1, ..., BCU-N) acquires the first voltage of the corresponding battery cluster, that is, Figure 1 The voltage at point ①.

[0058] The target output voltage is greater than the maximum voltage among the first voltages, and the DC / DC converter increases the voltage of each battery cluster, thereby improving the utilization rate of the battery cluster.

[0059] Considering that there is a certain voltage difference when the DC / DC converter starts, the target output voltage V out The following relationship is satisfied:

[0060] V out =V rack_max +η*△V DC

[0061] Among them, V rack_max Indicates the maximum voltage, △V DC It represents the starting voltage difference of the DC / DC converter, η represents the adjustment coefficient, η≥1.

[0062] In this embodiment, in order to ensure the smooth operation of the DC / DC converter, the voltage difference during its startup is taken into consideration, and the accuracy of the target output voltage is also improved.

[0063] In some embodiments, before sending the output voltage control instruction to each sub-control unit (BCU-1, ..., BCU-N), the main control unit BAU sends a second voltage acquisition instruction to each sub-control unit (BCU-1, ..., BCU-N) to instruct the sub-control unit (BCU-1, ..., BCU-N) to acquire the pre-charge voltage at the output end of the corresponding pre-charge control circuit 102. When the main control unit BAU determines that the pre-charge voltage at the output end of each pre-charge control circuit 102 reaches the minimum voltage among the first voltages, it determines that the pre-charge end condition is met and sends the start control instruction.

[0064] After the main control unit BAU obtains the pre-charge voltage at the output end of the pre-charge control circuit 102, Figure 1 The voltage at point ② in the middle determines that all pre-charge voltages have reached the minimum voltage V among the first voltages. rack_min By judging the pre-charging end condition, it is avoided that each DC / DC converter is controlled to start when the pre-charging end condition is not met.

[0065] Taking into account that the startup and adjustment of the DC / DC converter requires a certain amount of time, in some embodiments, the main control unit BAU sends a third voltage acquisition instruction to each sub-control unit (BCU-1, ..., BCU-N) before sending a startup control instruction to each sub-control unit (BCU-1, ..., BCU-N) to instruct the sub-control unit (BCU-1, ..., BCU-N) to acquire the output voltage of the corresponding DC / DC converter output terminal.

[0066] When the main control unit BAU determines that the output voltages of the output terminals of each DC / DC converter have reached the target output voltage, it sends a start control instruction to each sub-control unit (BCU-1, ..., BCU-N).

[0067] After the main control unit BAU obtains the output voltage of the DC / DC converter output terminal, Figure 1 When the output voltage of each DC / DC converter output terminal reaches the target output voltage, the start control command is sent to each sub-control unit to avoid the voltage difference between the DC / DC converters when the output voltage does not reach the target output voltage, which leads to the generation of circulating current.

[0068] In some embodiments, taking into account the delay in the conduction of the first contactor KM1, the main control unit BAU sends a start control instruction to each sub-control unit (BCU-1, ..., BCU-N) to instruct the sub-control unit (BCU-1, ..., BCU-N) to control the first contactor KM1 to be turned on for a preset time, and then control the third contactor KM2 in the pre-charge control circuit 102 to be disconnected.

[0069] Figure 5 FIG. 1 is a schematic diagram of the overall process of the startup control method of the energy storage system in one embodiment of the present application. Figure 5 As shown, the main control unit BAU sends a first voltage acquisition instruction to each sub-control unit (BCU-1, ..., BCU-N) to instruct the sub-control unit (BCU-1, ..., BCU-N) to acquire the first voltage of the corresponding battery cluster and acquire the maximum voltage V rack_max and minimum voltage V rack_min . The main control unit BAU sends a pre-charge control instruction to each sub-control unit (BCU-1, ..., BCU-N) to instruct the sub-control unit (BCU-1, ..., BCU-N) to control the first contactor KM1 and the second contactor KM3 in the pre-charge control circuit 102 to be turned on, so as to control the battery cluster 101 to pre-charge the DC / DC converter. The main control unit BAU sends a second voltage acquisition instruction to each sub-control unit (BCU-1, ..., BCU-N) to instruct the sub-control unit (BCU-1, ..., BCU-N) to obtain the pre-charge voltage at the output end of the corresponding pre-charge control circuit 102. When the pre-charge voltage at the output end of each pre-charge control circuit 102 reaches the minimum voltage among the first voltages, it is determined that the pre-charge end condition is met. When the pre-charge end condition is met, the main control unit BAU sends an output voltage control instruction to each sub-control unit (BCU-1, ..., BCU-N), and the DC / DC converter controls its own output voltage to adjust to the target output voltage based on the output voltage control instruction. The main control unit BAU sends a third voltage acquisition instruction to each sub-control unit (BCU-1, ..., BCU-N) to instruct the sub-control unit (BCU-1, ..., BCU-N) to obtain the output voltage of the corresponding DC / DC converter output terminal. When the output voltage of each DC / DC converter output terminal reaches the target output voltage, a start control instruction is sent to each sub-control unit (BCU-1, ..., BCU-N). After the sub-control unit (BCU-1, ..., BCU-N) controls the first contactor KM1 to turn on for a preset time, it controls the third contactor KM2 in the pre-charging control circuit 102 to turn off, thereby realizing the start control of the energy storage system.

[0070] In one embodiment, an electronic device is provided, including a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the following steps are implemented:

[0071] Sending a pre-charge control instruction to each of the sub-control units to control the battery cluster to pre-charge the DC / DC converter through the pre-charge control circuit;

[0072] After the pre-charging is completed, an output voltage control instruction is sent to each of the sub-control units to control the output voltage of each of the DC / DC converters;

[0073] After each of the DC / DC converters controls its own output voltage to adjust to the target output voltage based on the output voltage control instruction, a start control instruction is sent to each of the sub-control units.

[0074] Those of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, an artificial intelligence (AI) processor, etc., but are not limited to this.

[0075] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0076] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. An energy storage system, characterized in that: The invention comprises a main control unit and a plurality of battery cluster units, wherein the battery cluster unit comprises a sub-control unit, a battery cluster, a pre-charge control circuit, a DC / DC converter, a first contactor and a second contactor, wherein the first contactor is connected between the positive electrode of the battery cluster and the DC / DC converter, the pre-charge control circuit is connected in parallel with the first contactor, and the second contactor is connected between the negative electrode of the battery cluster and the DC / DC converter; wherein, The main control unit is used to send a pre-charge control instruction to each of the sub-control units to control the battery cluster to pre-charge the DC / DC converter through the pre-charge control circuit; and send an output voltage control instruction to each of the sub-control units, and after each of the DC / DC converters controls its own output voltage to adjust to the target output voltage based on the output voltage control instruction, the main control unit sends a start control instruction to each of the sub-control units.

2. The energy storage system according to claim 1, characterized in that: Before sending the pre-charge control instruction, the main control unit sends a first voltage acquisition instruction to each of the sub-control units to instruct the sub-control unit to acquire the first voltage of the corresponding battery cluster; The output voltage control instruction includes the target output voltage, and the target output voltage is greater than a maximum voltage among the first voltages.

3. The energy storage system according to claim 2, characterized in that: The target output voltage V out The following relationship is satisfied: V out =V rack_max +η*△V DC Among them, V rack_max Indicates the maximum voltage, △V DC represents the starting voltage difference of the DC / DC converter, η represents the adjustment coefficient, and η≥1.

4. The energy storage system according to claim 2, characterized in that: The main control unit sends a second voltage acquisition instruction to each of the sub-control units before sending the output voltage control instruction, so as to instruct the sub-control unit to acquire the pre-charge voltage of the output end of the corresponding pre-charge control circuit; When the main control unit determines that the pre-charge voltages at the output ends of the pre-charge control circuits have reached the minimum voltage among the first voltages, it sends an output voltage control instruction.

5. The energy storage system according to claim 1, characterized in that: The main control unit sends a third voltage acquisition instruction to each of the sub-control units before sending the start control instruction, so as to instruct the sub-control unit to acquire the output voltage of the corresponding DC / DC converter output terminal; When the main control unit determines that the output voltages of the output terminals of each of the DC / DC converters have reached the target output voltage, the main control unit sends the start control instruction.

6. The energy storage system according to claim 1, characterized in that: The main control unit sends the startup control instruction to each of the sub-control units to instruct the sub-control unit to control the first contactor to be turned on for a preset time and then control the pre-charging control circuit to be turned off.

7. The energy storage system according to claim 1, characterized in that: The pre-charge control circuit includes a third contactor and a pre-charge resistor connected in series; the sub-control unit controls the third contactor to be turned on or off to control the pre-charge control circuit to be turned on or off.

8. The energy storage system according to claim 1, characterized in that: The energy storage system also includes an energy storage converter; The main control unit sends a pre-charge control instruction to each of the sub-control units to instruct the sub-control units to control the pre-charge control circuit and the second contactor to be turned on, so as to control the battery cluster to pre-charge the DC / DC converter and the energy storage converter.

9. A startup control method for an energy storage system, applied to the energy storage system according to any one of claims 1 to 8, characterized in that: The method comprises: Sending a pre-charge control instruction to each of the sub-control units to control the battery cluster to pre-charge the DC / DC converter through the pre-charge control circuit; After the pre-charging is completed, an output voltage control instruction is sent to each of the sub-control units to control the output voltage of each of the DC / DC converters; After each of the DC / DC converters controls its own output voltage to adjust to the target output voltage based on the output voltage control instruction, a start control instruction is sent to each of the sub-control units.

10. An electronic device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to claim 9 are implemented.

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