In-phase SOC equalization control method, control device, energy storage system, and medium

Abstract

Disclosed in the present application are an in-phase SOC equalization control method, a control device, an energy storage system, and a medium. The method comprises: when three-phase energy storage battery modules of an energy storage unit are in an operating state, monitoring the SOC of each energy storage battery pack in a target-phase energy storage battery module; when it is determined that there is an SOC imbalance in the target-phase energy storage battery module, determining from among a plurality of target energy storage battery packs of the target-phase energy storage battery module an energy storage battery pack to be processed; switching the energy storage battery pack to be processed from the operating state to a hot standby state; and, when the SOC of the target-phase energy storage battery module has restored to balance, switching the energy storage battery pack to be processed from the hot standby state to the operating state. When there is an in-phase SOC imbalance between the three-phase energy storage battery modules of the energy storage unit, the present method controls the energy storage battery pack of a large SOC deviation to be temporarily out of operation, helping to improve the energy efficiency utilization rate of the energy storage unit.

Description

Intra-phase SOC equalization control method, control device, energy storage system and medium

[0001] This application claims priority to Chinese Patent Application No. 202411545516.4, filed on October 31, 2024, entitled "Intra-phase SOC Equalization Control Method, Control Device, Energy Storage System and Medium", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application belongs to the field of energy storage technology, and in particular relates to an intra-phase SOC equalization control method, control device, energy storage system and medium. Background Technology

[0003] Energy storage units are systems used to store and release electrical energy, designed to balance power supply and demand and improve grid stability. Three-phase energy storage battery modules are a crucial component of energy storage units. Each phase energy storage battery module consists of multiple energy storage battery banks, and each phase energy storage battery module is used to process one phase of the three-phase current in the power system.

[0004] After a period of operation, the state of charge (SOC) of multiple energy storage battery packs within a phase of a three-phase energy storage battery module may become unbalanced due to various reasons.

[0005] Currently, during the operation of energy storage units, when the state of charge (SOC) within the three-phase energy storage battery modules is unbalanced, the energy storage unit is prone to a bottleneck effect, resulting in low energy efficiency.

[0006] Application content

[0007] In view of this, embodiments of this application provide an intra-phase SOC equalization control method, control device, energy storage system, and medium to overcome the problems of the prior art. Technical solutions

[0008] The technical solution adopted in the embodiments of this application is:

[0009] In a first aspect, embodiments of this application provide an intra-phase SOC equalization control method, including:

[0010] When the three-phase energy storage battery module of the energy storage unit is in operation, monitor the SOC of each energy storage battery in the target phase energy storage battery module. The target phase energy storage battery module is at least one phase energy storage battery module in the three-phase energy storage battery module.

[0011] When it is determined that there is an imbalance in SOC of the target phase energy storage battery module, the energy storage battery group to be processed is determined from multiple target energy storage battery groups of the target phase energy storage battery module. The SOC deviation value of the energy storage battery group to be processed is greater than or equal to the first SOC deviation threshold. The SOC deviation value is used to characterize the difference between the SOC of the energy storage battery group to be processed and the target SOC mean value. The target SOC mean value is the average SOC value of multiple target energy storage battery groups.

[0012] Switch the energy storage battery pack to be processed from the operating state to the hot standby state;

[0013] Once the SOC of the target phase energy storage battery module is restored to equilibrium, the energy storage battery pack to be processed will be switched from hot standby state to operating state.

[0014] In some optional embodiments, the three-phase energy storage battery module is provided with a bypass switch corresponding to each energy storage battery pack. The bypass switch is used to bypass the corresponding energy storage battery pack when it is closed.

[0015] Switching the energy storage battery pack to be processed from the operating state to the hot standby state includes:

[0016] The target bypass switch corresponding to the energy storage battery pack to be processed is closed, so that the energy storage battery pack to be processed switches from the operating state to the hot standby state.

[0017] In some optional embodiments, the three-phase energy storage battery module is provided with an energy storage inverter corresponding to each energy storage battery pack. The energy storage inverter is used to control the charging and discharging of the corresponding energy storage battery pack according to the received modulation signal.

[0018] Switching the energy storage battery pack to be processed from the operating state to the hot standby state includes:

[0019] The target energy storage converter outputs a modulation signal with a modulation signal amplitude of zero to the energy storage battery pack to be processed, so that the energy storage battery pack to be processed switches from the operating state to the hot standby state.

[0020] In some optional embodiments, when it is determined that there is a SOC imbalance in the target phase energy storage battery module, before determining the energy storage battery group to be processed from multiple target energy storage battery groups of the target phase energy storage battery module, the intra-phase SOC equalization control method further includes:

[0021] Determine a SOC deviation value for each target energy storage battery pack to obtain multiple SOC deviation values;

[0022] Determine whether there is SOC imbalance in the target phase energy storage battery module based on multiple SOC deviation values;

[0023] When it is determined that the target phase energy storage battery module has a state of charge imbalance, the energy storage battery group to be processed is determined from multiple target energy storage battery groups of the target phase energy storage battery module, including:

[0024] When it is determined that the target phase energy storage battery module has an unbalanced SOC based on multiple SOC deviation values, the energy storage battery group to be processed is selected from multiple target energy storage battery groups.

[0025] In some optional embodiments, determining whether the target phase energy storage battery module has an unbalanced SOC based on multiple SOC deviation values ​​includes:

[0026] Determine multiple absolute values ​​of SOC deviation for multiple SOC deviation values, with each absolute value of SOC deviation corresponding to one SOC deviation value;

[0027] If there is an absolute value of SOC deviation that is greater than or equal to the second SOC deviation threshold among multiple absolute values ​​of SOC deviation, it is determined that the target phase energy storage battery module has an unbalanced SOC, and the second SOC deviation threshold is less than the first SOC deviation threshold.

[0028] If there is no absolute SOC deviation greater than or equal to the second SOC deviation threshold among multiple absolute SOC deviation values, it is determined that the target phase energy storage battery module does not have SOC imbalance.

[0029] In some optional embodiments, the operating state is a discharge state, and the multiple SOC deviation values ​​include multiple first sub-SOC deviation values, each of which corresponds to a target energy storage battery pack.

[0030] Determine a SOC deviation value for each target energy storage battery pack to obtain multiple SOC deviation values, including:

[0031] Calculate the difference between the average target SOC and the SOC of each target energy storage battery pack to obtain a first sub-SOC deviation value, and then obtain multiple first sub-SOC deviation values.

[0032] In some optional embodiments, when it is determined that the target phase energy storage battery module has an unbalanced SOC based on multiple SOC deviation values, the energy storage battery group to be processed is determined from multiple target energy storage battery groups, including:

[0033] When it is determined that there is an imbalance in the SOC of the target phase energy storage battery module based on multiple SOC deviation values, a first sub-target SOC deviation value that is greater than or equal to the first SOC deviation threshold is selected from multiple first sub-SOC deviation values.

[0034] Among multiple target energy storage battery packs, the target energy storage battery pack corresponding to the SOC deviation value of the first sub-target is identified as the energy storage battery pack to be processed.

[0035] In some optional embodiments, when it is determined that the target phase energy storage battery module has an unbalanced SOC based on multiple SOC deviation values, selecting a first sub-target SOC deviation value that is greater than or equal to a first SOC deviation threshold from multiple first sub-SOC deviation values ​​includes:

[0036] If the target phase energy storage battery module is determined to have SOC imbalance based on multiple SOC deviation values, the first N first sub-SOC deviation values ​​that are greater than or equal to the first SOC deviation threshold are selected from multiple first sub-SOC deviation values ​​as the first sub-target SOC deviation values, where N is less than or equal to the preset redundancy number of the target phase energy storage battery module.

[0037] In some optional embodiments, the operating state is a charging state, and the multiple SOC deviation values ​​include multiple second sub-SOC deviation values, each of which corresponds to a target energy storage battery pack.

[0038] Determine a SOC deviation value for each target energy storage battery pack to obtain multiple SOC deviation values, including:

[0039] Calculate the difference between the SOC of each target energy storage battery pack and the mean SOC of the target battery pack to obtain a second sub-SOC deviation value, and then obtain multiple second sub-SOC deviation values.

[0040] In some optional embodiments, when it is determined that the target phase energy storage battery module has an unbalanced SOC based on multiple SOC deviation values, the energy storage battery group to be processed is determined from multiple target energy storage battery groups, including:

[0041] When it is determined that there is an imbalance in the SOC of the target phase energy storage battery module based on multiple SOC deviation values, a second sub-target SOC deviation value that is greater than or equal to the first SOC deviation threshold is selected from multiple second sub-SOC deviation values.

[0042] Among multiple target energy storage battery packs, the target energy storage battery pack corresponding to the SOC deviation value of the second sub-target is identified as the energy storage battery pack to be processed.

[0043] In some optional embodiments, when it is determined that the target phase energy storage battery module has an unbalanced SOC based on multiple SOC deviation values, selecting a second sub-target SOC deviation value that is greater than or equal to the first SOC deviation threshold from multiple second sub-SOC deviation values ​​includes:

[0044] If the target phase energy storage battery module is determined to have SOC imbalance based on multiple SOC deviation values, the top N second sub-SOC deviation values ​​that are greater than or equal to the first SOC deviation threshold are selected from multiple second sub-SOC deviation values ​​as the second sub-target SOC deviation values, where N is less than or equal to the preset redundancy number of the target phase energy storage battery module.

[0045] In some optional embodiments, before switching the energy storage battery pack to be processed from hot standby state to operating state after the SOC of the target phase energy storage battery module has been restored to equilibrium, the intra-phase SOC equalization control method further includes:

[0046] Based on the current number of target energy storage battery packs, determine the current phase shift angle of the current target energy storage battery pack. The current target energy storage battery pack is the target energy storage battery pack that is in operation among multiple target energy storage battery packs.

[0047] The operation of the target energy storage battery pack is controlled based on the current phase shift angle.

[0048] In some optional embodiments, after the SOC of the target phase energy storage battery module is restored to equilibrium, and the energy storage battery pack to be processed is switched from hot standby state to operating state, the intra-phase SOC equalization control method further includes:

[0049] The target phase shift angle of the multiple target energy storage battery packs is determined based on the target number of the multiple target energy storage battery packs;

[0050] The operation of multiple target energy storage battery packs is controlled based on the target phase shift angle.

[0051] Secondly, embodiments of this application provide an in-phase SOC equalization control device, comprising:

[0052] The monitoring and determination module is used to monitor the SOC of each energy storage battery module in the target phase energy storage battery module when the three-phase energy storage battery module of the energy storage unit is in operation. The target phase energy storage battery module is at least one phase energy storage battery module in the three-phase energy storage battery module.

[0053] The first determining module is used to determine the energy storage battery group to be processed from multiple target energy storage battery groups of the target phase energy storage battery module when it is determined that there is an imbalance in SOC of the target phase energy storage battery module. The SOC deviation value of the energy storage battery group to be processed is greater than or equal to the first SOC deviation threshold. The SOC deviation value is used to characterize the difference between the SOC of the energy storage battery group to be processed and the target SOC mean value. The target SOC mean value is the average SOC value of multiple target energy storage battery groups.

[0054] The first switching module is used to switch the energy storage battery pack to be processed from the running state to the hot standby state.

[0055] The second switching module is used to switch the energy storage battery pack to be processed from the hot standby state to the running state when the SOC of the target phase energy storage battery module is restored to equilibrium.

[0056] Thirdly, embodiments of this application provide an energy storage system, including:

[0057] Memory;

[0058] One or more processors, coupled to memory;

[0059] One or more applications, wherein one or more applications are stored in memory and configured to be executed by one or more processors, and one or more applications are configured to perform the intra-phase SOC equalization control method provided in the first aspect above.

[0060] Fourthly, embodiments of this application provide a computer-readable storage medium storing program code, which can be called by a processor to execute the intra-phase SOC equalization control method provided in the first aspect above.

[0061] Fifthly, embodiments of this application provide a computer program product that, when run on a computer device, causes the computer device to execute the intra-phase SOC equalization control method provided in the first aspect above. Beneficial effects

[0062] The beneficial effect of the first aspect provided by the embodiments of this application is that: during the operation of the energy storage unit, when the SOC of the three-phase energy storage battery modules of the energy storage unit is unbalanced, the energy storage battery modules with larger SOC deviations are temporarily shut down until the SOC of the three-phase energy storage battery modules is balanced, and the operation of the temporarily shut-down energy storage battery modules is restored. This can suppress the occurrence of the bottleneck effect and help improve the energy efficiency of the energy storage unit.

[0063] It is understood that the beneficial effects of the second to fifth aspects mentioned above can be found in the relevant descriptions in the first aspect mentioned above, and will not be repeated here. Attached Figure Description

[0064] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or exemplary technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0065] Figure 1 shows a schematic diagram of a scenario of the energy storage system provided in an embodiment of this application.

[0066] Figure 2 shows a flowchart of an intra-phase SOC equalization control method provided in an embodiment of this application.

[0067] Figure 3 shows another schematic flowchart of the intra-phase SOC equalization control method provided in the embodiments of this application.

[0068] Figure 4 shows another schematic flowchart of the intra-phase SOC equalization control method provided in the embodiments of this application.

[0069] Figure 5 shows another schematic flowchart of the intra-phase SOC equalization control method provided in the embodiments of this application.

[0070] Figure 6 shows a schematic diagram of a scenario of the energy storage system in the in-phase SOC equalization control method provided in the embodiments of this application.

[0071] Figure 7 shows a schematic diagram of a scenario of the intra-phase SOC equalization control method provided in an embodiment of this application.

[0072] Figure 8 shows a structural block diagram of an in-phase SOC equalization control device provided in an embodiment of this application.

[0073] Figure 9 shows a functional block diagram of an energy storage system provided in an embodiment of this application.

[0074] Figure 10 illustrates a computer-readable storage medium provided in an embodiment of this application for storing or carrying program code implementing the in-phase SOC equalization control method provided in an embodiment of this application.

[0075] Figure 11 shows a computer program product provided in an embodiment of this application for storing or carrying program code that implements the in-phase SOC equalization control method provided in an embodiment of this application. Detailed Implementation

[0076] To make the objectives, features, and advantages of this application more apparent and understandable, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0077] It should be understood that, when used in this specification and the appended claims, the term "comprising" indicates the presence of the described features, integrals, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or a collection thereof.

[0078] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the application. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0079] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0080] Furthermore, in the description of this application, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0081] Energy storage units are systems used to store and release electrical energy, designed to balance power supply and demand and improve grid stability. Three-phase energy storage battery modules are a crucial component of energy storage units. Each phase energy storage battery module consists of multiple energy storage battery banks, and each phase energy storage battery module is used to process one phase of the three-phase current in the power system.

[0082] After a period of operation, the state of charge (SOC) of multiple energy storage battery packs within a phase of a three-phase energy storage battery module may become unbalanced due to various reasons.

[0083] Currently, during the operation of energy storage units, when the state of charge (SOC) within the three-phase energy storage battery modules is unbalanced, the energy storage unit is prone to a bottleneck effect, resulting in low energy efficiency.

[0084] To address the aforementioned issues, the phase SOC equalization control method, control device, energy storage system, and medium provided in this application, when the three-phase energy storage battery modules of the energy storage unit are in operation, monitor the SOC of each energy storage battery group within the target phase energy storage battery module. The target phase energy storage battery module is at least one phase energy storage battery module in the three-phase energy storage battery module. If an SOC imbalance is determined in the target phase energy storage battery module, a battery group to be processed is identified from multiple target energy storage battery groups within the target phase energy storage battery module. The SOC deviation value of the battery group to be processed is greater than or equal to a first SOC deviation threshold. The SOC deviation value is used to characterize the difference between the SOC of the battery group to be processed and the target SOC. The difference between the average OC values, the target average SOC is the average SOC of multiple target energy storage battery packs, and the energy storage battery pack to be processed is switched from the operating state to the hot standby state. When the SOC of the target phase energy storage battery module is restored to equilibrium, the energy storage battery pack to be processed is switched from the hot standby state to the operating state. During the operation of the energy storage unit, when the SOC of the three phase energy storage battery modules of the energy storage unit is unbalanced, the energy storage battery pack with the larger SOC deviation is temporarily shut down until the SOC of the three phase energy storage battery modules is balanced, and then the operation of the energy storage battery pack that has been temporarily shut down is restored. This can suppress the occurrence of the short board effect and help improve the energy efficiency of the energy storage unit.

[0085] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0086] Please refer to Figure 1, which shows a schematic diagram of an application scenario of the energy storage system provided in the embodiment of this application. The energy storage system may include an energy storage unit 100 and a main control device 200. The main control device 200 is communicatively connected to the energy storage unit 100 and interacts with the energy storage unit 100 for data exchange.

[0087] The energy storage unit 100 may include a three-phase energy storage battery module. For example, the three-phase energy storage battery module may be an A-phase energy storage battery module, a B-phase energy storage battery module, and a C-phase energy storage battery module. Each phase energy storage battery module may be composed of multiple energy storage battery packs, and each energy storage battery pack may be composed of one or more energy storage batteries.

[0088] As an example, each phase energy storage battery module can be composed of multiple energy storage battery packs connected in series and / or in parallel.

[0089] The main control device 200 may be any one of, but not limited to, servers or terminal devices.

[0090] Servers can include, but are not limited to, independent physical servers, server clusters or distributed systems consisting of multiple physical servers, and cloud servers.

[0091] Terminal devices may include, but are not limited to, mobile terminal devices (e.g., mobile phones, PDAs, tablet PCs, laptops, smartwatches, smart bracelets, etc.) and fixed terminal devices (e.g., desktop computers, smart panels, all-in-one computers, etc.).

[0092] In some implementations, the energy storage system may also include a power grid connected to a three-phase energy storage battery module, which can be used to charge and discharge the power grid.

[0093] Please refer to Figure 2, which shows a flowchart of an intra-phase SOC equalization control method provided in an embodiment of this application. In a specific embodiment, the intra-phase SOC equalization control method can be applied to the main control device 200 in the energy storage system shown in Figure 1. The flowchart shown in Figure 2 will be described in detail below using the main control device 200 as an example. The intra-phase SOC equalization control method may include the following steps 110 to 140.

[0094] Step 110: With the three-phase energy storage battery modules of the energy storage unit in operation, monitor the SOC of each energy storage battery pack in the target phase energy storage battery module.

[0095] In this embodiment of the application, when the three-phase energy storage battery module of the energy storage unit is in operation, the main control equipment can monitor the SOC of each energy storage battery pack in the target phase energy storage battery module.

[0096] The target phase energy storage battery module can be at least one phase energy storage battery module in a three-phase energy storage battery module. Each phase energy storage battery module can be composed of multiple energy storage battery packs, and the operating state can include, but is not limited to, the discharge state and the charging state.

[0097] In some implementations, the energy storage system may further include a group of multiphase battery management systems (BMS), with each BMS group corresponding to one phase energy storage battery module. Each BMS in each phase BMS group is configured relative to one energy storage battery pack of its corresponding phase energy storage battery module, and each BMS can be used to collect the State of Charge (SOC) of its corresponding energy storage battery pack. Each phase BMS group can be communicatively connected to the main control device and interact with the main control device for data exchange.

[0098] When the three-phase energy storage battery modules of the energy storage unit are in operation, the main control equipment can broadcast monitoring commands to the target phase BMS group. Each BMS in the target phase BMS group receives and responds to the monitoring commands, collects the SOC of a corresponding energy storage battery group, and sends a SOC to the main control equipment. The main control equipment receives a SOC returned by each BMS in the target phase BMS group and obtains the SOC of each energy storage battery group in the target phase energy storage battery module.

[0099] In some implementations, when the three-phase energy storage battery modules of the energy storage unit are in operation, the main control device can generate prompt information and receive the SOC of each energy storage battery pack in the target phase energy storage battery module uploaded by the user according to the prompt information.

[0100] The prompt information can be used to prompt the user to upload the SOC of each energy storage battery pack in the target phase energy storage battery module to the main control device. The prompt information can include, but is not limited to, at least one of the following: text prompt information, sound prompt information, and light prompt information.

[0101] Step 120: If it is determined that there is an imbalance in SOC of the target phase energy storage battery module, determine the energy storage battery group to be processed from multiple target energy storage battery groups of the target phase energy storage battery module.

[0102] In this embodiment of the application, when it is determined that the target phase energy storage battery module has an unbalanced SOC, the main control device can determine the energy storage battery group to be processed from multiple target energy storage battery groups of the target phase energy storage battery module.

[0103] Among them, the SOC deviation value of the energy storage battery pack to be processed can be greater than or equal to the first SOC deviation threshold, indicating that the SOC deviation of the energy storage battery pack to be processed is large. The SOC deviation value can be used to characterize the difference between the SOC of the energy storage battery pack to be processed and the target SOC mean value. The target SOC mean value can be the average SOC value of multiple target energy storage battery packs.

[0104] The first SOC deviation threshold can be used to characterize the minimum SOC deviation value of the energy storage battery pack to be processed relative to the multiple SOCs of the target phase energy storage battery module, which are relatively discrete. The first SOC deviation threshold may include, but is not limited to, the SOC deviation value preset by the user, or the SOC deviation value automatically generated by the main control device based on the control process of equalizing the SOCs within the phases of the three-phase energy storage battery module multiple times.

[0105] Step 130: Switch the energy storage battery pack to be processed from the running state to the hot standby state.

[0106] In this embodiment of the application, the main control device can switch the energy storage battery pack to be processed from the running state to the hot standby state.

[0107] Among them, the hot standby status can be used to characterize the state in which the energy storage battery pack to be processed is ready for operation.

[0108] In some implementations, the three-phase energy storage battery module may be equipped with a bypass switch corresponding to each energy storage battery pack. The bypass switch can be used to bypass the corresponding energy storage battery pack when closed. Each bypass switch can be communicatively connected to the main control device and exchange data with the main control device.

[0109] The main control equipment can send a first control command to the target bypass switch corresponding to the energy storage battery pack to be processed. The target bypass switch receives and responds to the first control command, closes the target bypass switch, and bypasses the energy storage battery pack to be processed, so that the energy storage battery pack to be processed switches from the running state to the hot standby state. Based on the control of the target bypass switch, the energy storage battery pack to be processed is temporarily taken out of operation. When the energy storage battery pack to be processed is taken out of operation, the remaining target energy storage battery packs in the target phase energy storage battery module operate normally, which helps to improve the operational stability of the energy storage unit.

[0110] Among them, the energy storage battery packs to be processed in the hot standby state can be put into operation when the target bypass switch is opened.

[0111] In some implementations, the three-phase energy storage battery module may be equipped with a power conversion system (PCS) corresponding to each energy storage battery pack. The PCS can be used to control the charging and discharging of the corresponding energy storage battery pack according to the received modulation signal.

[0112] The main control device can send a second control command to the target PCS corresponding to the energy storage battery pack to be processed. The target PCS receives and responds to the second control command and outputs a modulation signal with a modulation signal amplitude of zero to the energy storage battery pack to be processed, so that the energy storage battery pack to be processed switches from the running state to the hot standby state. Based on the target energy storage converter, the energy storage battery pack to be processed is temporarily taken out of operation without the need for additional control accessories, which helps to reduce the control cost of equalizing the SOC of the three-phase energy storage battery module.

[0113] Among them, the energy storage battery pack to be processed in the hot standby state can be put into operation when the amplitude of the modulation signal output by the target PCS is not zero.

[0114] Step 140: When the SOC of the target phase energy storage battery module is restored to equilibrium, switch the energy storage battery pack to be processed from the hot standby state to the running state.

[0115] In this embodiment, when the SOC of the target phase energy storage battery module is restored to equilibrium, the main control device can switch the energy storage battery pack to be processed from the hot standby state to the operating state. During the operation of the energy storage unit, if the SOC of the three phase energy storage battery modules of the energy storage unit is unbalanced, the energy storage battery pack with a large SOC deviation is temporarily shut down until the SOC of the three phase energy storage battery modules is balanced, and then the operation of the temporarily shut-down energy storage battery pack is restored. This can suppress the occurrence of the bottleneck effect and help improve the energy efficiency of the energy storage unit.

[0116] In some implementations, a bypass switch corresponding to each energy storage battery pack can be set in the three-phase energy storage battery module. The main control device can send a third control command to the target bypass switch. The target bypass switch receives and responds to the third control command, and the target bypass switch is opened to disconnect the bypass of the energy storage battery pack to be processed, so that the energy storage battery pack to be processed can switch from hot standby state to running state.

[0117] In some implementations, the three-phase energy storage battery module may be equipped with a PCS corresponding to each energy storage battery pack. The main control device may send a fourth control command to the target PCS. The target PCS receives and responds to the fourth control command and outputs a preset modulation signal with a non-zero modulation signal amplitude to the energy storage battery pack to be processed, so that the energy storage battery pack to be processed switches from the hot standby state to the running state.

[0118] The solution provided in this application monitors the State of Charge (SOC) of each battery pack within the target phase battery module when the three-phase battery module of the energy storage unit is in operation. If an SOC imbalance is determined within the target phase battery module, a battery pack to be processed is selected from multiple target battery packs within the target phase battery module. The SOC deviation value of the battery pack to be processed is greater than or equal to a first SOC deviation threshold. The SOC deviation value characterizes the difference between the SOC of the battery pack to be processed and the target average SOC value, where the target average SOC value is the average SOC value of the multiple target battery packs. The average value is used to switch the energy storage battery pack to be processed from the operating state to the hot standby state, and when the SOC of the target phase energy storage battery module is restored to equilibrium, the energy storage battery pack to be processed is switched from the hot standby state to the operating state. During the operation of the energy storage unit, when the SOC of the three phase energy storage battery modules of the energy storage unit is unbalanced, the energy storage battery pack with the larger SOC deviation is temporarily shut down until the SOC of the three phase energy storage battery modules is balanced, and then the operation of the energy storage battery pack that has been temporarily shut down is restored. This can suppress the occurrence of the bottleneck effect and help improve the energy efficiency of the energy storage unit.

[0119] Please refer to Figure 3, which shows a flowchart of an intra-phase SOC equalization control method provided in another embodiment of this application. In a specific embodiment, the intra-phase SOC equalization control method can be applied to the main control device 200 in the energy storage system shown in Figure 1. The flowchart shown in Figure 3 will be described in detail below using the main control device 200 as an example. The intra-phase SOC equalization control method may include the following steps 210 to 260.

[0120] Step 210: With the three-phase energy storage battery modules of the energy storage unit in operation, monitor the SOC of each energy storage battery pack in the target phase energy storage battery module.

[0121] In this embodiment, step 210 can be referred to the corresponding steps in the previous embodiments, and will not be repeated here.

[0122] Step 220: Determine a SOC deviation value for each target energy storage battery pack to obtain multiple SOC deviation values.

[0123] In this embodiment, the main control device can calculate the average SOC of multiple target energy storage battery packs of the target phase energy storage battery module to obtain the target average SOC value, and calculate a SOC deviation value of each target energy storage battery pack based on the SOC of each target energy storage battery pack and the target average SOC value to obtain multiple SOC deviation values.

[0124] In some implementations, the operating state can be a discharge state, and the multiple SOC deviation values ​​can include multiple first sub-SOC deviation values, each of which can correspond to a target energy storage battery pack.

[0125] The main control equipment can calculate the average SOC of multiple target energy storage battery packs for the target phase energy storage battery module, obtain the target average SOC, and calculate the difference between the target average SOC and the SOC of each target energy storage battery pack to obtain a first sub-SOC deviation value. Multiple first sub-SOC deviation values ​​can be obtained. When the energy storage unit is in a discharging state, the difference between the target average SOC and the SOC of the target energy storage battery pack is calculated to obtain the first sub-SOC deviation value, which helps to improve the accuracy of determining the energy storage battery pack to be processed based on the first sub-SOC deviation value.

[0126] In some implementations, the operating state can be a charging state, and the multiple SOC deviation values ​​can include multiple second sub-SOC deviation values, each of which can correspond to a target energy storage battery pack.

[0127] The main control equipment can calculate the average SOC of multiple target energy storage battery packs for the target phase energy storage battery module, obtain the target SOC average value, and calculate the difference between the SOC of each target energy storage battery pack and the target SOC average value to obtain a second sub-SOC deviation value. Multiple second sub-SOC deviation values ​​can be obtained. When the energy storage unit is in the charging state, the difference between the SOC of each target energy storage battery pack and the target SOC average value is calculated to obtain the second sub-SOC deviation value, which helps to improve the accuracy of determining the energy storage battery pack to be processed based on the second sub-SOC deviation value.

[0128] Step 230: Determine whether there is SOC imbalance in the target phase energy storage battery module based on multiple SOC deviation values.

[0129] In this embodiment, the main control device can determine multiple absolute values ​​of SOC deviation and determine whether there is SOC imbalance in the target phase energy storage battery module based on the multiple absolute values ​​of SOC deviation and the second SOC deviation threshold. It can also determine whether the SOC within the three-phase energy storage battery module is balanced based on the absolute values ​​of SOC deviation of the energy storage battery pack and the second SOC deviation threshold, which helps to improve the accuracy of the determination of the balance of SOC within the three-phase energy storage battery module.

[0130] Each absolute value of SOC deviation corresponds to a SOC deviation value. The second SOC deviation threshold can be used to characterize the minimum SOC deviation value of the intra-phase SOC imbalance of the three-phase energy storage battery module. The second SOC deviation threshold is less than the first SOC deviation threshold.

[0131] The second SOC deviation threshold may include, but is not limited to, the SOC deviation value preset by the user, or the SOC deviation value automatically generated by the main control device based on the control process of balancing the SOC within the phases of the three-phase energy storage battery module multiple times.

[0132] If there is an absolute SOC deviation greater than or equal to the second SOC deviation threshold among multiple absolute SOC deviation values, it is determined that the target phase energy storage battery module has SOC imbalance; if there is no absolute SOC deviation greater than or equal to the second SOC deviation threshold among multiple absolute SOC deviation values, it is determined that the target phase energy storage battery module does not have SOC imbalance.

[0133] Step 240: If it is determined that there is an imbalance in the SOC of the target phase energy storage battery module based on multiple SOC deviation values, determine the energy storage battery group to be processed from multiple target energy storage battery groups.

[0134] In this embodiment, when it is determined that the target phase energy storage battery module has an unbalanced SOC based on multiple SOC deviation values, the main control device can determine the energy storage battery group to be processed from multiple target energy storage battery groups. Based on the SOC deviation value of the energy storage battery group, it can determine whether the SOC within the three-phase energy storage battery module is balanced, which helps to improve the accuracy of the determination of the balance of the SOC within the three-phase energy storage battery module.

[0135] In some implementations, the operating state can be a discharge state, and the multiple SOC deviation values ​​can include multiple first sub-SOC deviation values, each of which can correspond to a target energy storage battery pack.

[0136] When it is determined that there is an imbalance in the SOC of the target phase energy storage battery module based on multiple SOC deviation values, the main control equipment can select a first sub-target SOC deviation value that is greater than or equal to the first SOC deviation threshold from multiple first sub-SOC deviation values, and identify the target energy storage battery group corresponding to the first sub-target SOC deviation value as the energy storage battery group to be processed. When the energy storage unit is in a discharging state, the target energy storage battery group with a low SOC is identified as the energy storage battery group to be processed. When the energy storage unit is temporarily removed, it is beneficial to achieve the balance of the SOC within the three-phase energy storage battery module, which is beneficial to improve the control success rate of balancing the SOC within the three-phase energy storage battery module.

[0137] In some implementations, the operating state can be a discharge state, and the multiple SOC deviation values ​​can include multiple first sub-SOC deviation values, each of which can correspond to a target energy storage battery pack.

[0138] When it is determined that there is an imbalance in the SOC of the target phase energy storage battery module based on multiple SOC deviation values, the main control equipment can select the top N first sub-SOC deviation values ​​that are greater than or equal to the first SOC deviation threshold from multiple first sub-SOC deviation values ​​as the first sub-target SOC deviation values. The target energy storage battery group corresponding to the first sub-target SOC deviation value among the multiple target energy storage battery groups is identified as the energy storage battery group to be processed. When the energy storage unit is in a discharging state, the top N target energy storage battery groups with low SOC are identified as the energy storage battery groups to be processed. When the energy storage battery groups to be processed are temporarily removed, the energy storage unit operates normally, which is conducive to improving the operational stability of the energy storage unit.

[0139] Wherein, N is less than or equal to the preset redundancy number of the target phase energy storage battery module. The preset redundancy number is used to characterize the number of target energy storage battery packs that can be taken out of operation in the target phase energy storage battery module under normal operation.

[0140] In some implementations, the operating state can be a charging state, and the multiple SOC deviation values ​​can include multiple second sub-SOC deviation values, each of which can correspond to a target energy storage battery pack.

[0141] When multiple SOC deviation values ​​indicate that the target phase energy storage battery module has an unbalanced SOC, the main control device can select a second sub-target SOC deviation value that is greater than or equal to the first SOC deviation threshold from multiple second sub-SOC deviation values. The target energy storage battery group corresponding to the second sub-target SOC deviation value is then identified as the energy storage battery group to be processed. When the energy storage unit is in a charging state, the target energy storage battery group with a high SOC is identified as the energy storage battery group to be processed. Temporarily removing the energy storage battery group to be processed helps to achieve phase SOC balance in the three-phase energy storage battery module, which helps to improve the control success rate of phase SOC balance control in the three-phase energy storage battery module.

[0142] In some implementations, the operating state can be a charging state, and the multiple SOC deviation values ​​can include multiple second sub-SOC deviation values, each of which can correspond to a target energy storage battery pack.

[0143] When it is determined that there is an imbalance in the SOC of the target phase energy storage battery module based on multiple SOC deviation values, the main control equipment can select the top N second sub-SOC deviation values ​​that are greater than or equal to the first SOC deviation threshold from multiple second sub-SOC deviation values ​​as the second sub-target SOC deviation values. The target energy storage battery group corresponding to the second sub-target SOC deviation value among the multiple target energy storage battery groups is identified as the energy storage battery group to be processed. When the energy storage unit is in the charging state, the top N target energy storage battery groups with high SOC are identified as the energy storage battery groups to be processed. When the energy storage battery groups to be processed are temporarily removed, the energy storage unit operates normally, which is conducive to improving the operational stability of the energy storage unit.

[0144] Step 250: Switch the energy storage battery pack to be processed from the running state to the hot standby state.

[0145] Step 260: When the SOC of the target phase energy storage battery module is restored to equilibrium, switch the energy storage battery pack to be processed from the hot standby state to the running state.

[0146] In this embodiment, steps 250 and 260 can be referred to the corresponding steps in the previous embodiments, and will not be repeated here.

[0147] The solution provided in this embodiment monitors the State of Charge (SOC) of each battery pack within the target phase battery module when the three-phase battery module of the energy storage unit is in operation, and determines an SOC deviation value for each target battery pack to obtain multiple SOC deviation values. Based on these multiple SOC deviation values, it is determined whether there is SOC imbalance in the target phase battery module. If an SOC imbalance is determined based on the multiple SOC deviation values, a battery pack to be processed is selected from the multiple target battery packs, and the battery pack to be processed is... When the energy storage unit switches from the operating state to the hot standby state, and when the SOC of the target phase energy storage battery module is restored to equilibrium, the energy storage battery group to be processed is switched from the hot standby state to the operating state. During the operation of the energy storage unit, if the SOC of the three phase energy storage battery modules is unbalanced, the energy storage battery group with the larger SOC deviation is temporarily taken out of operation until the SOC of the three phase energy storage battery modules is balanced, and then the operation of the energy storage battery group that has been temporarily taken out of operation is restored. This can suppress the occurrence of the bottleneck effect and help improve the energy efficiency of the energy storage unit.

[0148] Furthermore, judging whether the SOC of a three-phase energy storage battery module is balanced based on the SOC deviation value of the energy storage battery pack is beneficial to improving the accuracy of the determination of the balance of the SOC of a three-phase energy storage battery module.

[0149] Please refer to Figure 4, which shows a flowchart of an intra-phase SOC equalization control method provided in another embodiment of this application. In a specific embodiment, the intra-phase SOC equalization control method can be applied to the main control device 200 in the energy storage system shown in Figure 1. The flowchart shown in Figure 4 will be described in detail below using the main control device 200 as an example. The intra-phase SOC equalization control method may include the following steps 310 to 360.

[0150] Step 310: With the three-phase energy storage battery modules of the energy storage unit in operation, monitor the SOC of each energy storage battery pack in the target phase energy storage battery module.

[0151] Step 320: If it is determined that there is an imbalance in SOC of the target phase energy storage battery module, determine the energy storage battery group to be processed from multiple target energy storage battery groups of the target phase energy storage battery module.

[0152] Step 330: Switch the energy storage battery pack to be processed from the running state to the hot standby state.

[0153] In this embodiment, steps 310, 320 and 330 can be referred to the corresponding steps in the previous embodiments, and will not be repeated here.

[0154] Step 340: Determine the current phase shift angle of the current target energy storage battery pack based on the current quantity of the current target energy storage battery pack.

[0155] In this embodiment, the main control device can determine the current phase shift angle of the current target energy storage battery pack based on the current quantity of the current target energy storage battery pack.

[0156] The current target energy storage battery pack can be the target energy storage battery pack that is in operation among multiple target energy storage battery packs, that is, the target energy storage battery pack excluding the energy storage battery pack to be processed among multiple target energy storage battery packs.

[0157] The current phase shift angle can be used to characterize the phase difference between the pulse width modulation (PWM) signals between the current target energy storage battery packs.

[0158] If the current number of the target energy storage battery pack is n1, then the current phase shift angle θ1 can be calculated according to Formula 1 based on the current number n1.

[0159] Formula 1 is: θ1=360° / n1.

[0160] Step 350: Control the operation of the current target energy storage battery pack according to the current phase shift angle.

[0161] In this embodiment, the main control device can control the operation of the current target energy storage battery pack according to the current phase shift angle. When the energy storage battery pack with a large SOC deviation is temporarily taken out of operation, the phase shift angle of the currently operating energy storage battery pack is automatically updated according to the number of currently operating energy storage battery packs, which helps to improve the control accuracy of the currently operating energy storage battery pack based on the phase shift angle.

[0162] Step 360: When the SOC of the target phase energy storage battery module is restored to equilibrium, switch the energy storage battery pack to be processed from the hot standby state to the running state.

[0163] In this embodiment, step 360 can be referred to the corresponding steps in the previous embodiments, and will not be repeated here.

[0164] The solution provided in this embodiment monitors the State of Charge (SOC) of each battery pack within the target phase battery module when the three-phase battery module of the energy storage unit is in operation. If an SOC imbalance is detected in the target phase battery module, a battery pack to be processed is selected from multiple target battery packs in the target phase battery module. This battery pack is then switched from operation to hot standby mode. Based on the current number of target battery packs, the current phase shift angle of the current target battery pack is determined, and the current phase shift angle is used to control the current... The system operates the target energy storage battery pack, and switches the battery pack to be processed from hot standby to operating state when the SOC of the target phase energy storage battery module is restored to equilibrium. During the operation of the energy storage unit, if the SOC of the three phase energy storage battery modules is unbalanced, the energy storage battery pack with a large SOC deviation is temporarily taken out of operation until the SOC of the three phase energy storage battery modules is balanced, and then the operation of the temporarily taken-out energy storage battery pack is restored. This can suppress the occurrence of the bottleneck effect and help improve the energy efficiency of the energy storage unit.

[0165] Furthermore, when a battery storage unit with a large SOC deviation is temporarily taken out of operation, the phase shift angle of the currently operating battery storage unit is automatically updated based on the number of currently operating battery storage units. This helps to improve the control accuracy of controlling the currently operating battery storage units based on the phase shift angle.

[0166] Please refer to Figure 5, which shows a flowchart of an intra-phase SOC equalization control method provided in another embodiment of this application. In a specific embodiment, the intra-phase SOC equalization control method can be applied to the main control device 200 in the energy storage system shown in Figure 1. The flowchart shown in Figure 5 will be described in detail below using the main control device 200 as an example. The intra-phase SOC equalization control method may include the following steps 410 to 460.

[0167] Step 410: With the three-phase energy storage battery modules of the energy storage unit in operation, monitor the SOC of each energy storage battery pack in the target phase energy storage battery module.

[0168] Step 420: If it is determined that there is an imbalance in SOC of the target phase energy storage battery module, determine the energy storage battery group to be processed from multiple target energy storage battery groups of the target phase energy storage battery module.

[0169] Step 430: Switch the energy storage battery pack to be processed from the running state to the hot standby state.

[0170] Step 440: When the SOC of the target phase energy storage battery module is restored to equilibrium, switch the energy storage battery pack to be processed from the hot standby state to the running state.

[0171] In this embodiment, steps 410, 420, 430 and 440 can be referred to the corresponding steps in the previous embodiments, and will not be repeated here.

[0172] Step 450: Determine the target phase shift angle of the multiple target energy storage battery packs based on the target number of the multiple target energy storage battery packs.

[0173] In this embodiment, the main control device can determine the target phase shift angle of multiple target energy storage battery packs based on the target number of multiple target energy storage battery packs.

[0174] The target phase shift angle can be used to characterize the phase difference between the PWM signals of multiple target energy storage battery packs.

[0175] If the target number of multiple target energy storage battery packs is n2, then the target phase shift angle θ2 can be calculated according to Formula 2 based on the target number n2.

[0176] Formula 2 is: θ2=360° / n2.

[0177] Step 460: Control the operation of multiple target energy storage battery packs according to the target phase shift angle.

[0178] In this embodiment, the main control device can control the operation of multiple target energy storage battery packs according to the target phase shift angle. When the operation of an energy storage battery pack that has been temporarily out of operation is restored, the phase shift angle of the energy storage battery pack in operation is automatically updated, which helps to improve the control accuracy of controlling the energy storage battery pack in operation according to the phase shift angle.

[0179] In one application scenario, as shown in Figure 6, the energy storage unit may include a three-phase energy storage battery module. The three-phase energy storage battery module may be an A-phase energy storage battery module, a B-phase energy storage battery module, and a C-phase energy storage battery module. Each of the A-phase, B-phase, and C-phase energy storage battery modules may include 29 energy storage battery packs connected in series.

[0180] Each energy storage battery pack in the A-phase, B-phase, and C-phase energy storage battery modules can be connected to a bypass switch. Each bypass switch can be used to bypass a connected energy storage battery pack from the corresponding phase energy storage battery module.

[0181] Phase A energy storage battery module can be connected to the first grid-connected reactor (L b1 The B-phase energy storage battery module is connected to the three-phase busbar of the power grid and can be connected to the second grid-connected reactor (L). b2 The C-phase energy storage battery module is connected to the three-phase busbar of the power grid and can be connected to the third grid-connected reactor (L). b3 The three-phase busbars connected to the power grid.

[0182] Phase A energy storage battery modules can be connected to the first metal oxide surge arrester (MOA1), phase B energy storage battery modules can be connected to the second metal oxide surge arrester (MOA2), phase C energy storage battery modules can be connected to the third metal oxide surge arrester (MOA3), and phase A, phase B, and phase C energy storage battery modules can all be connected to the fourth metal oxide surge arrester (MOA4). The three-phase busbar can be connected to the fifth metal oxide surge arrester (MOA5).

[0183] Each energy storage battery pack can be connected to a BMS (Battery Management System), and each BMS can be used to collect the SOC (State of Charge) of one connected energy storage battery pack.

[0184] Each energy storage battery pack can also be connected to a PCS (Power Control System), and each PCS can be used to control the operation of one connected energy storage battery pack.

[0185] Based on the energy storage unit shown in Figure 6, as shown in Figure 7, the intra-phase SOC equalization control method can be implemented through steps 510 to 590.

[0186] Step 510: Collect multiple SOCs of multiple energy storage battery packs for each phase energy storage battery module.

[0187] Among them, the main control equipment can collect multiple SOCs of multiple energy storage battery packs for each phase energy storage battery module based on multiple BMS.

[0188] Each phase energy storage battery module can consist of multiple energy storage battery packs, with each SOC corresponding to one energy storage battery pack in each phase energy storage battery module.

[0189] Step 520: Based on the multiple SOCs of each phase energy storage battery module, determine whether the intra-phase SOC of the target phase energy storage battery module is balanced.

[0190] The main control equipment can calculate multiple SOC deviation values ​​of the target phase energy storage battery module and determine whether the intra-phase SOC of the target phase energy storage battery module is balanced based on the multiple SOC deviation values.

[0191] Step 530: If it is determined that the SOC of the target phase energy storage battery module is unbalanced, the energy storage battery group to be processed is determined from multiple target energy storage battery groups according to the operating status of the three-phase energy storage battery module.

[0192] In the case where the three-phase energy storage battery module is in a discharging state and the phase SOC of the target phase energy storage battery module is determined to be unbalanced, if the first sub-SOC deviation value of the two smallest SOCs among the multiple SOCs of multiple target energy storage battery groups is greater than or equal to the first SOC deviation threshold, the two target energy storage battery groups corresponding to the two smallest SOCs are determined as energy storage battery groups to be processed.

[0193] When the three-phase energy storage battery module is in a charging state and it is determined that the SOC of the target phase energy storage battery module is unbalanced, if the second sub-SOC deviation value of the two largest SOCs among the multiple SOCs of multiple target energy storage battery groups is greater than or equal to the first SOC deviation threshold, the two target energy storage battery groups corresponding to the two largest SOCs are determined as energy storage battery groups to be processed.

[0194] Step 540: Switch the energy storage battery pack to be processed from the running state to the hot standby state.

[0195] Step 550: Determine the current phase shift angle of the current target energy storage battery pack based on the current quantity of the current target energy storage battery pack.

[0196] The current number of target energy storage battery packs is 27. Based on the current number of 27, the current phase shift angle θ1 can be calculated according to Formula 1 as 360° / 27.

[0197] Step 560: Control the operation of the current target energy storage battery pack according to the current phase shift angle.

[0198] Step 570: When the SOC of the target phase energy storage battery module is restored to equilibrium, switch the energy storage battery pack to be processed from the hot standby state to the running state.

[0199] Step 580: Determine the target phase shift angle of the multiple target energy storage battery packs based on the target number of the multiple target energy storage battery packs.

[0200] The target number of multiple target energy storage battery packs is 29. Based on the target number of 29, the current phase shift angle θ2 = 360° / 29 can be calculated according to Formula 2.

[0201] Step 590: Control the operation of multiple target energy storage battery packs according to the target phase shift angle.

[0202] The solution provided in this embodiment monitors the State of Charge (SOC) of each battery pack within the target phase battery module when the three-phase battery module of the energy storage unit is in operation. If an SOC imbalance is detected in the target phase battery module, a battery pack to be processed is selected from multiple target battery packs in the target phase battery module. This battery pack is switched from operation to hot standby. Once the SOC of the target phase battery module is balanced, it is switched back from hot standby to operation. Based on the target number of multiple target battery packs, a target phase shift angle is determined, and the operation of the multiple target battery packs is controlled according to the target phase shift angle. During the operation of the energy storage unit, if there is an intra-phase SOC imbalance in the three-phase battery module, the battery pack with the larger SOC deviation is temporarily taken out of operation until the intra-phase SOC of the three-phase battery module is balanced, at which point the temporarily taken-out battery pack is resumed operation. This can suppress the weakest link effect and improve the energy efficiency of the energy storage unit.

[0203] Furthermore, when resuming operation of energy storage battery packs that have been temporarily taken out of service, automatically updating the phase shift angle of the operating energy storage battery packs helps improve the control accuracy of controlling the operating energy storage battery packs based on the phase shift angle.

[0204] Please refer to Figure 8, which illustrates an intra-phase SOC equalization control device 600 provided in one embodiment of this application. In a specific embodiment, the intra-phase SOC equalization control device 600 can be applied to the main control device 200 in the energy storage system shown in Figure 1. The intra-phase SOC equalization control device 600 shown in Figure 8 will be described in detail below using the main control device 200 as an example. The intra-phase SOC equalization control device 600 may include a monitoring module 610, a first determination module 620, a first switching module 630, and a second switching module 640.

[0205] The monitoring module 610 can be used to monitor the SOC of each energy storage battery group in the target phase energy storage battery module when the three-phase energy storage battery module of the energy storage unit is in operation. The target phase energy storage battery module can be at least one phase energy storage battery module in the three-phase energy storage battery module. The first determination module 620 can be used to determine the energy storage battery group to be processed from multiple target energy storage battery groups of the target phase energy storage battery module when it is determined that there is an imbalance in the SOC of the target phase energy storage battery module. The SOC deviation value of the energy storage battery group to be processed can be greater than or equal to a first SOC deviation threshold. The SOC deviation value can be used to characterize the difference between the SOC of the energy storage battery group to be processed and the target SOC mean value. The target SOC mean value is the average SOC value of multiple target energy storage battery groups. The first switching module 630 can be used to switch the energy storage battery group to be processed from the operating state to the hot standby state. The second switching module 640 can be used to switch the energy storage battery group to be processed from the hot standby state to the operating state when the SOC of the target phase energy storage battery module is restored to balance.

[0206] In some embodiments, the three-phase energy storage battery module may be equipped with a bypass switch corresponding to each energy storage battery pack. The bypass switch can be used to bypass the corresponding energy storage battery pack when closed. The first switching module 630 may include a first control unit.

[0207] The first control unit can be used to control the closing of the target bypass switch corresponding to the energy storage battery pack to be processed, so as to switch the energy storage battery pack to be processed from the operating state to the hot standby state.

[0208] In some embodiments, the three-phase energy storage battery module may be equipped with an energy storage inverter corresponding to each energy storage battery pack. The energy storage inverter can be used to control the charging and discharging of the corresponding energy storage battery pack according to the received modulation signal; the first switching module 630 may also include a second control unit.

[0209] The second control unit can be used to control the target energy storage converter to output a modulation signal with a modulation signal amplitude of zero to the energy storage battery pack to be processed, so that the energy storage battery pack to be processed can switch from the operating state to the hot standby state.

[0210] In some embodiments, the in-phase SOC equalization control device 600 may further include a second determining module and a third determining module.

[0211] The second determining module can be used to determine a SOC deviation value for each target energy storage battery group before determining the energy storage battery group to be processed from multiple target energy storage battery groups of the target phase energy storage battery module in the case that the first determining module 620 determines that there is a SOC imbalance in the target phase energy storage battery module, so as to obtain multiple SOC deviation values; the third determining module can be used to determine whether there is a SOC imbalance in the target phase energy storage battery module based on the multiple SOC deviation values.

[0212] In some implementations, the first determining module 620 may include a first determining unit.

[0213] The first determining unit can be used to determine the energy storage battery pack to be processed from multiple target energy storage battery packs when it is determined that there is an imbalance in the SOC of the target phase energy storage battery module based on multiple SOC deviation values.

[0214] In some implementations, the third determining module may include a second determining unit, a third determining unit, and a fourth determining unit.

[0215] The second determining unit can be used to determine multiple absolute values ​​of SOC deviations among multiple SOC deviation values, with each absolute value of SOC deviation corresponding to one SOC deviation value; the third determining unit can be used to determine that the target phase energy storage battery module has SOC imbalance when there is an absolute value of SOC deviation among the multiple absolute values ​​of SOC deviation that is greater than or equal to the second SOC deviation threshold, where the second SOC deviation threshold can be less than the first SOC deviation threshold; the fourth determining unit can be used to determine that the target phase energy storage battery module does not have SOC imbalance when there is no absolute value of SOC deviation among the multiple absolute values ​​of SOC deviation that is greater than or equal to the second SOC deviation threshold.

[0216] In some implementations, the operating state can be a discharge state, and the multiple SOC deviation values ​​can include multiple first sub-SOC deviation values, each of which can correspond to a target energy storage battery pack; the second determination module can include a first calculation unit.

[0217] The first calculation unit can be used to calculate the difference between the average target SOC and the SOC of each target energy storage battery pack to obtain a first sub-SOC deviation value, so as to obtain multiple first sub-SOC deviation values.

[0218] In some implementations, the first determining unit may include a first selecting subunit and a first determining subunit.

[0219] The first selection subunit can be used to select a first sub-target SOC deviation value that is greater than or equal to a first SOC deviation threshold from a plurality of first sub-SOC deviation values ​​when it is determined that there is an SOC imbalance in the target phase energy storage battery module based on a plurality of SOC deviation values; the first determination subunit can be used to determine the target energy storage battery group corresponding to the first sub-target SOC deviation value among a plurality of target energy storage battery groups as the energy storage battery group to be processed.

[0220] In some implementations, the first selection subunit may include a first selection secondary subunit.

[0221] The first sub-selection unit can be used to select the top N first sub-SOC deviation values ​​that are greater than or equal to the first SOC deviation threshold from the multiple first sub-SOC deviation values ​​as the first sub-target SOC deviation values ​​when it is determined that there is an imbalance in the SOC of the target phase energy storage battery module based on multiple SOC deviation values. N can be less than or equal to the preset redundancy number of the target phase energy storage battery module.

[0222] In some implementations, the operating state can also be a charging state, and the multiple SOC deviation values ​​can also include multiple second sub-SOC deviation values, each of which can also correspond to a target energy storage battery pack; the third determination module can also include a second calculation unit.

[0223] The second calculation unit can be used to calculate the difference between the SOC of each target energy storage battery pack and the average SOC of the target, to obtain a second sub-SOC deviation value, and thus obtain multiple second sub-SOC deviation values.

[0224] In some implementations, the first determining unit may further include a second selecting subunit and a second determining subunit.

[0225] The second selection subunit can be used to select a second sub-target SOC deviation value that is greater than or equal to the first SOC deviation threshold from a plurality of second sub-SOC deviation values ​​when it is determined that there is an SOC imbalance in the target phase energy storage battery module based on a plurality of SOC deviation values; the second determination subunit can be used to determine the target energy storage battery group corresponding to the second sub-target SOC deviation value among a plurality of target energy storage battery groups as the energy storage battery group to be processed.

[0226] In some implementations, the second selection subunit may include a second selection secondary subunit.

[0227] The second sub-selection unit can be used to select the top N second sub-SOC deviation values ​​that are greater than or equal to the first SOC deviation threshold from the multiple second sub-SOC deviation values ​​as the second sub-target SOC deviation values ​​when it is determined that there is an SOC imbalance in the target phase energy storage battery module based on multiple SOC deviation values. N can be less than or equal to the preset redundancy number of the target phase energy storage battery module.

[0228] In some embodiments, the in-phase SOC equalization control device 600 may further include a fourth determining module and a first control module.

[0229] The fourth determining module can be used by the second switching module 640 to determine the current phase shift angle of the current target energy storage battery group based on the current number of the current target energy storage battery group before switching the energy storage battery group to be processed from the hot standby state to the running state when the SOC of the target phase energy storage battery group is restored to equilibrium. The current target energy storage battery group can be the target energy storage battery group in the running state among multiple target energy storage battery groups. The first control module can be used to control the operation of the current target energy storage battery group based on the current phase shift angle.

[0230] In some embodiments, the in-phase SOC equalization control device 600 may further include a fifth determining module and a second control module.

[0231] The fifth determining module can be used by the second switching module 640 to switch the energy storage battery pack to be processed from the hot standby state to the running state after the SOC of the target phase energy storage battery module is restored to equilibrium, and to determine the target phase shift angle of the multiple target energy storage battery packs according to the target number of the multiple target energy storage battery packs; the second control module can be used to control the operation of the multiple target energy storage battery packs according to the target phase shift angle.

[0232] The solution provided in this embodiment monitors the State of Charge (SOC) of each battery pack within the target phase battery module when the three-phase battery module of the energy storage unit is in operation. If an SOC imbalance is determined within the target phase battery module, a battery pack to be processed is selected from multiple target battery packs within the target phase battery module. The SOC deviation value of the battery pack to be processed is greater than or equal to a first SOC deviation threshold. The SOC deviation value characterizes the difference between the SOC of the battery pack to be processed and the target average SOC, where the target average SOC is the SOC of the multiple target battery packs. The average value is calculated, and the energy storage battery pack to be processed is switched from the operating state to the hot standby state. When the SOC of the target phase energy storage battery module is restored to equilibrium, the energy storage battery pack to be processed is switched from the hot standby state to the operating state. During the operation of the energy storage unit, when the SOC of the three phase energy storage battery modules of the energy storage unit is unbalanced, the energy storage battery pack with the larger SOC deviation is temporarily shut down until the SOC of the three phase energy storage battery modules is balanced, and then the operation of the energy storage battery pack that has been temporarily shut down is restored. This can suppress the occurrence of the bottleneck effect and help improve the energy efficiency of the energy storage unit.

[0233] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For device embodiments, since they are basically similar to method embodiments, the description is relatively simple; relevant parts can be referred to in the descriptions of the method embodiments. Any processing method described in the method embodiments can be implemented in the device embodiments through corresponding processing modules, and will not be elaborated upon further in the device embodiments.

[0234] Furthermore, the functional modules in the various embodiments of this application can be integrated into one processing module, or each module can exist physically separately, or two or more modules can be integrated into one module. The integrated modules described above can be implemented in hardware or as software functional modules.

[0235] Please refer to Figure 9, which shows a functional block diagram of an energy storage system 700 provided in an embodiment of this application. The energy storage system 700 may include one or more of the following components: a memory 710, a processor 720, and one or more application programs. One or more application programs may be stored in the memory 710 and configured to be executed by one or more processors 720. One or more application programs are configured to perform the methods as described in the foregoing method embodiments.

[0236] The memory 710 may include random access memory (RAM) or read-only memory. The memory 710 may be used to store instructions, programs, code, code sets, or instruction sets. The memory 710 may include a program storage area and a data storage area. The program storage area may store instructions for implementing an operating system, instructions for implementing at least one function (such as monitoring SOC, determining the existence of SOC imbalance, determining the energy storage battery pack to be processed, switching the operating state to hot standby state, switching the hot standby state to the operating state, controlling the closing of the target bypass switch, controlling the output modulation signal, determining a SOC deviation value, obtaining multiple SOC deviation values, determining whether there is SOC imbalance, determining the absolute value of multiple SOC deviations, determining that there is no SOC imbalance, calculating a first sub-SOC deviation value, obtaining multiple first sub-SOC deviation values, selecting a first sub-target SOC deviation value, calculating a second sub-SOC deviation value, obtaining multiple second sub-SOC deviation values, selecting a second sub-target SOC deviation value, determining the current phase shift angle, controlling the operation of the current target energy storage battery pack, determining the target phase shift angle, and controlling the operation of multiple target energy storage battery packs, etc.), and instructions for implementing the various method embodiments described below. The storage data area can also store data created by the energy storage system 700 during use (such as energy storage unit, three-phase energy storage battery module, operating status, SOC, target phase energy storage battery module, multiple target energy storage battery groups, energy storage battery group to be processed, SOC deviation value, first SOC deviation threshold, target SOC average value, difference, hot standby status, target bypass switch, target energy storage converter, modulation signal, modulation signal amplitude, SOC deviation value, absolute value of SOC deviation, second SOC deviation threshold, second SOC deviation threshold is less than first SOC deviation threshold, discharge status, first sub-SOC deviation value, first sub-target SOC deviation value, charging status, second sub-SOC deviation value, second sub-target SOC deviation value, current target energy storage battery group, current quantity, current phase shift angle, target quantity, and target phase shift angle).

[0237] The processor 720 may include one or more processing cores. The processor 720 connects to various parts of the energy storage system 700 using various interfaces and lines, and performs various functions and processes data of the energy storage system 700 by running or executing instructions, programs, code sets, or instruction sets stored in the memory 710, and by calling data stored in the memory 710. Optionally, the processor 720 may be implemented using at least one hardware form of Digital Signal Processing (DSP), Field-Programmable Gate Array (FPGA), or Programmable Logic Array (PLA). The processor 720 may integrate one or a combination of several of the following: Central Processing Unit (CPU), Graphics Processing Unit (GPU), and modem. The CPU primarily handles the operating system, user interface, and applications; the GPU is responsible for rendering and drawing the displayed content; and the modem handles wireless communication. It is understood that the modem may also not be integrated into the processor 720 and may be implemented separately using a communication chip.

[0238] Please refer to Figure 10, which shows a structural block diagram of a computer-readable storage medium provided in an embodiment of this application. The computer-readable storage medium 800 stores program code 810, which can be called by a processor to execute the methods described in the above method embodiments.

[0239] The computer-readable storage medium 800 may be an electronic memory such as flash memory, EEPROM (Electrically Erasable Programmable Read-Only Memory), EPROM, hard disk, or ROM. Optionally, the computer-readable storage medium 800 includes a non-transitory computer-readable storage medium. The computer-readable storage medium 800 has storage space for program code 810 that performs any of the method steps described above. This program code can be read from or written to one or more computer program products. The program code 810 may, for example, be compressed in a suitable form.

[0240] Please refer to Figure 11, which shows a structural block diagram of a computer program product 900 provided in an embodiment of this application. The computer program product 900 includes a computer program / instructions 910, which is stored in a computer-readable storage medium of a computer device. When the computer program product 900 runs on the computer device, the processor of the computer device reads the computer program / instructions 910 from the computer-readable storage medium, and executes the computer program / instructions 910, causing the computer device to perform the methods described in the above method embodiments.

[0241] The solution provided in this embodiment monitors the State of Charge (SOC) of each battery pack within the target phase battery module when the three-phase battery module of the energy storage unit is in operation. If an SOC imbalance is determined within the target phase battery module, a battery pack to be processed is selected from multiple target battery packs within the target phase battery module. The SOC deviation value of the battery pack to be processed is greater than or equal to a first SOC deviation threshold. The SOC deviation value characterizes the difference between the SOC of the battery pack to be processed and the target average SOC, where the target average SOC is the SOC of the multiple target battery packs. The average value is calculated, and the energy storage battery pack to be processed is switched from the operating state to the hot standby state. When the SOC of the target phase energy storage battery module is restored to equilibrium, the energy storage battery pack to be processed is switched from the hot standby state to the operating state. During the operation of the energy storage unit, when the SOC of the three phase energy storage battery modules of the energy storage unit is unbalanced, the energy storage battery pack with the larger SOC deviation is temporarily shut down until the SOC of the three phase energy storage battery modules is balanced, and then the operation of the energy storage battery pack that has been temporarily shut down is restored. This can suppress the occurrence of the bottleneck effect and help improve the energy efficiency of the energy storage unit.

[0242] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. An intra-phase SOC equalization control method, wherein, include: When the three-phase energy storage battery module of the energy storage unit is in operation, the SOC of each energy storage battery module in the target phase energy storage battery module is monitored. The target phase energy storage battery module is at least one phase energy storage battery module in the three-phase energy storage battery module. If it is determined that the target phase energy storage battery module has an unbalanced SOC, a battery group to be processed is determined from multiple target energy storage battery groups of the target phase energy storage battery module. The SOC deviation value of the battery group to be processed is greater than or equal to a first SOC deviation threshold. The SOC deviation value is used to characterize the difference between the SOC of the battery group to be processed and the target SOC mean value. The target SOC mean value is the average SOC value of the multiple target energy storage battery groups. Switch the energy storage battery pack to be processed from the operating state to the hot standby state; When the SOC of the target phase energy storage battery module is restored to equilibrium, the energy storage battery pack to be processed is switched from the hot standby state to the operating state.

2. The method according to claim 1, wherein, The three-phase energy storage battery module is equipped with a bypass switch corresponding to each energy storage battery pack. The bypass switch is used to bypass the corresponding energy storage battery pack when it is closed. The step of switching the energy storage battery pack to be processed from the operating state to the hot standby state includes: The target bypass switch corresponding to the energy storage battery pack to be processed is closed, so that the energy storage battery pack to be processed is switched from the operating state to the hot standby state.

3. The method according to claim 1, wherein, The three-phase energy storage battery module is equipped with an energy storage converter that corresponds to each energy storage battery pack. The energy storage converter is used to control the charging and discharging of the corresponding energy storage battery pack according to the received modulation signal. The step of switching the energy storage battery pack to be processed from the operating state to the hot standby state includes: The target energy storage converter outputs a modulation signal with a modulation signal amplitude of zero to the energy storage battery pack to be processed, so that the energy storage battery pack to be processed switches from the operating state to the hot standby state.

4. The method according to any one of claims 1 to 3, wherein, Before determining the energy storage battery group to be processed from multiple target energy storage battery groups of the target phase energy storage battery module when it is determined that the target phase energy storage battery module has a SOC imbalance, the method further includes: Determine a SOC deviation value for each target energy storage battery pack to obtain multiple SOC deviation values; Determine whether the target phase energy storage battery module has an unbalanced SOC based on the multiple SOC deviation values; The step of determining the energy storage battery group to be processed from multiple target energy storage battery groups of the target phase energy storage battery module when it is determined that there is a SOC imbalance in the target phase energy storage battery module includes: If it is determined that the target phase energy storage battery module has an unbalanced SOC based on the multiple SOC deviation values, the energy storage battery group to be processed is determined from the multiple target energy storage battery groups.

5. The method according to claim 4, wherein, The step of determining whether the target phase energy storage battery module has an unbalanced SOC based on the multiple SOC deviation values ​​includes: Determine multiple absolute values ​​of SOC deviation for the multiple SOC deviation values, with each absolute value of SOC deviation corresponding to one SOC deviation value; If there is an absolute value of SOC deviation among the plurality of absolute values ​​of SOC deviation that is greater than or equal to the second SOC deviation threshold, it is determined that the target phase energy storage battery module has an unbalanced SOC, and the second SOC deviation threshold is less than the first SOC deviation threshold. If none of the absolute values ​​of SOC deviation are greater than or equal to the second SOC deviation threshold, it is determined that the target phase energy storage battery module does not have SOC imbalance.

6. The method according to claim 4, wherein, The operating state is a discharge state, and the multiple SOC deviation values ​​include multiple first sub-SOC deviation values, each of which corresponds to a target energy storage battery pack. The process of determining a SOC deviation value for each target energy storage battery pack to obtain multiple SOC deviation values ​​includes: The difference between the average target SOC and the SOC of each target energy storage battery pack is calculated to obtain a first sub-SOC deviation value, and the plurality of first sub-SOC deviation values ​​are obtained.

7. The method according to claim 6, wherein, The step of determining the energy storage battery group to be processed from the multiple target energy storage battery groups when it is determined that the target phase energy storage battery module has an unbalanced SOC based on the multiple SOC deviation values ​​includes: If it is determined that the target phase energy storage battery module has an unbalanced SOC based on the plurality of SOC deviation values, a first sub-target SOC deviation value that is greater than or equal to the first SOC deviation threshold is selected from the plurality of first sub-SOC deviation values. The target energy storage battery pack that corresponds to the SOC deviation value of the first sub-target among the plurality of target energy storage battery packs is determined as the energy storage battery pack to be processed.

8. The method according to claim 7, wherein, When it is determined that the target phase energy storage battery module has an unbalanced SOC based on the plurality of SOC deviation values, selecting a first sub-target SOC deviation value that is greater than or equal to the first SOC deviation threshold from the plurality of first sub-SOC deviation values ​​includes: If it is determined that the target phase energy storage battery module has an unbalanced SOC based on the plurality of SOC deviation values, the first N first sub-SOC deviation values ​​that are greater than or equal to the first SOC deviation threshold are selected from the plurality of first sub-SOC deviation values ​​as the first sub-target SOC deviation values, where N is less than or equal to the preset redundancy number of the target phase energy storage battery module.

9. The method according to claim 4, wherein, The operating state is the charging state, and the multiple SOC deviation values ​​include multiple second sub-SOC deviation values, each of which corresponds to a target energy storage battery pack. The process of determining a SOC deviation value for each target energy storage battery pack to obtain multiple SOC deviation values ​​includes: The difference between the SOC of each target energy storage battery pack and the mean SOC of the target battery pack is calculated to obtain a second sub-SOC deviation value, thereby obtaining the plurality of second sub-SOC deviation values.

10. The method according to claim 9, wherein, The step of determining the energy storage battery group to be processed from the multiple target energy storage battery groups when it is determined that the target phase energy storage battery module has an unbalanced SOC based on the multiple SOC deviation values ​​includes: If it is determined that the target phase energy storage battery module has an unbalanced SOC based on the plurality of SOC deviation values, a second sub-target SOC deviation value that is greater than or equal to the first SOC deviation threshold is selected from the plurality of second sub-SOC deviation values. The target energy storage battery pack that corresponds to the SOC deviation value of the second sub-target among the plurality of target energy storage battery packs is determined as the energy storage battery pack to be processed.

11. The method according to claim 10, wherein, When it is determined that the target phase energy storage battery module has an unbalanced SOC based on the plurality of SOC deviation values, selecting a second sub-target SOC deviation value from the plurality of second sub-SOC deviation values ​​that is greater than or equal to the first SOC deviation threshold includes: If it is determined that the target phase energy storage battery module has an unbalanced SOC based on the plurality of SOC deviation values, the first N second sub-SOC deviation values ​​that are greater than or equal to the first SOC deviation threshold are selected from the plurality of second sub-SOC deviation values ​​as the second sub-target SOC deviation values, where N is less than or equal to the preset redundancy number of the target phase energy storage battery module.

12. The method according to any one of claims 1 to 11, wherein, Before switching the energy storage battery pack to be processed from the hot standby state to the operating state when the SOC of the target phase energy storage battery module is restored to equilibrium, the method further includes: Based on the current number of the current target energy storage battery packs, determine the current phase shift angle of the current target energy storage battery packs, where the current target energy storage battery packs are the target energy storage battery packs in the operating state among the plurality of target energy storage battery packs; The operation of the current target energy storage battery pack is controlled based on the current phase shift angle.

13. The method according to any one of claims 1 to 12, wherein, After the target phase energy storage battery module's SOC is restored and balanced, and the energy storage battery pack to be processed is switched from the hot standby state to the operating state, the method further includes: The target phase shift angle of the multiple target energy storage battery packs is determined based on the target number of the multiple target energy storage battery packs; The operation of the multiple target energy storage battery packs is controlled according to the target phase shift angle.

14. The method according to any one of claims 1 to 13, wherein, The three-phase energy storage battery module is equipped with a bypass switch corresponding to each energy storage battery pack. The bypass switch is used to bypass the corresponding energy storage battery pack when it is closed. When the SOC of the target phase energy storage battery module is restored to equilibrium, switching the energy storage battery pack to be processed from the hot standby state to the operating state includes: When the SOC of the target phase energy storage battery module is restored to equilibrium, a third control command is sent to the target bypass switch corresponding to the energy storage battery pack to be processed, so that the target bypass switch disconnects the bypass of the energy storage battery pack to be processed.

15. The method according to any one of claims 1 to 13, wherein, The three-phase energy storage battery module is equipped with an energy storage converter that corresponds to each energy storage battery pack. The energy storage converter is used to control the charging and discharging of the corresponding energy storage battery pack according to the received modulation signal. When the SOC of the target phase energy storage battery module is restored to equilibrium, switching the energy storage battery pack to be processed from the hot standby state to the operating state includes: When the SOC of the target phase energy storage battery module is restored to equilibrium, a fourth control command is sent to the target energy storage converter corresponding to the energy storage battery pack to be processed, so that the target energy storage converter outputs a preset modulation signal with a modulation signal amplitude of non-zero to the energy storage battery pack to be processed.

16. The method according to any one of claims 1 to 15, wherein, The energy storage system includes a multi-phase battery management system group, each phase battery management system group corresponds to a phase energy storage battery module, and each battery management system in each phase battery management system group is set relative to a energy storage battery group of the corresponding phase energy storage battery module. Each battery management system is used to collect the SOC of the corresponding energy storage battery group. The monitoring of the State of Charge (SOC) of each energy storage battery pack within the target phase energy storage battery module, while the three-phase energy storage battery module of the energy storage unit is in operation, includes: When the three-phase energy storage battery module is in operation, a monitoring command is broadcast to the target phase battery management system group corresponding to the target phase energy storage battery module, so that each target battery management system in the target phase battery management system group collects the SOC of the corresponding target energy storage battery group, obtains a SOC, and returns the SOC. The SOC of each energy storage battery pack is obtained by receiving the SOC returned by each target battery management system.

17. The method according to any one of claims 1 to 15, wherein, The monitoring of the State of Charge (SOC) of each energy storage battery pack within the target phase energy storage battery module, while the three-phase energy storage battery module of the energy storage unit is in operation, includes: When the three-phase energy storage battery module is in operation Generate a prompt message, which prompts the user to upload the SOC of each energy storage battery pack in the target phase energy storage battery module; Receive the SOC of each energy storage battery pack uploaded by the user.

18. An intra-phase SOC equalization control device, wherein, include: The monitoring module is used to monitor the SOC of each energy storage battery module in the target phase energy storage battery module when the three-phase energy storage battery module of the energy storage unit is in operation. The target phase energy storage battery module is at least one phase energy storage battery module in the three-phase energy storage battery module. The first determining module is used to determine, when it is determined that there is a SOC imbalance in the target phase energy storage battery module, a to-be-processed energy storage battery group from a plurality of target energy storage battery groups of the target phase energy storage battery module, wherein the SOC deviation value of the to-be-processed energy storage battery group is greater than or equal to a first SOC deviation threshold, and the SOC deviation value is used to characterize the difference between the SOC of the to-be-processed energy storage battery group and the target SOC mean value, wherein the target SOC mean value is the average SOC value of the plurality of target energy storage battery groups; The first switching module is used to switch the energy storage battery pack to be processed from the operating state to the hot standby state. The second switching module is used to switch the energy storage battery pack to be processed from the hot standby state to the operating state when the SOC of the target phase energy storage battery module is restored to equilibrium.

19. An energy storage system, wherein, include: Memory; One or more processors are coupled to the memory; One or more applications, wherein the one or more applications are stored in the memory and configured to be executed by the one or more processors, and the one or more applications are configured to perform the method as described in any one of claims 1 to 17.

20. A computer-readable storage medium, wherein, The computer-readable storage medium contains program code that can be invoked by a processor to execute the method as described in any one of claims 1 to 17.

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