Intra-phase SOC balancing control method and control apparatus, energy storage system, and medium

Abstract

The present application discloses an intra-phase SOC balancing control method and control apparatus, an energy storage unit, and a medium. The method comprises: when a three-phase energy storage battery module of an energy storage unit is in an operating state, determining whether a target-phase energy storage battery module has achieved intra-phase SOC balancing; upon determining that the target-phase energy storage battery module does not achieve intra-phase SOC balancing, determining, on the basis of a preset redundancy number, an energy storage battery pack to be processed from among a plurality of target energy storage battery packs of the target-phase energy storage battery module; controlling the energy storage battery pack to be processed to switch from the operating state to a hot standby state; and upon determining that the target-phase energy storage battery module is restored to intra-phase SOC balancing, controlling the energy storage battery pack to be processed to switch from the hot standby state to the operating state. According to the method, when the three-phase energy storage battery module of the energy storage unit does not achieve intra-phase SOC balancing, the energy storage battery pack is controlled on the basis of the preset redundancy number to temporarily exit operation, which is beneficial to improving energy efficiency utilization 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. 202411547238.6, 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 modules of the energy storage unit are in operation, determine whether the SOC of the target phase energy storage battery module is balanced. The target phase energy storage battery module is at least one phase energy storage battery module in the three-phase energy storage battery modules.

[0011] When it is determined that the SOC imbalance within the target phase energy storage battery module is not met, 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 according to the preset redundancy number of the target phase energy storage battery module.

[0012] Control the energy storage battery pack to be processed to switch 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 is controlled to switch from hot standby state to operating state.

[0014] In some optional embodiments, based on a preset redundancy number 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, including:

[0015] Based on the SOC size order of each target energy storage battery group in the target phase energy storage battery module, a preset number of target energy storage battery groups with redundancy are selected sequentially from the target phase energy storage battery module to obtain the energy storage battery group to be processed.

[0016] In some optional embodiments, the operating state is a discharge state. Based on the SOC (State of Charge) order of each target energy storage battery group in the target phase energy storage battery module, a preset number of target energy storage battery groups with redundancy are selected sequentially from the target phase energy storage battery module to obtain the energy storage battery group to be processed, including:

[0017] Based on the SOC of each target energy storage battery group in the target phase energy storage battery module from small to large, target energy storage battery groups with a preset redundancy number are selected in sequence to obtain the energy storage battery group to be processed.

[0018] In some optional embodiments, the operating state is a charging state. Based on the SOC (State of Charge) order of each target energy storage battery group in the target phase energy storage battery module, a preset number of target energy storage battery groups with redundancy are selected sequentially from the target phase energy storage battery module to obtain the energy storage battery group to be processed, including:

[0019] Based on the order of SOC of each target energy storage battery group in the target phase energy storage battery module from largest to smallest, target energy storage battery groups with a preset redundancy number are selected in sequence to obtain the energy storage battery group to be processed.

[0020] In some optional embodiments, 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 according to the preset redundancy number of the target phase energy storage battery module, the in-phase SOC equalization control method further includes:

[0021] Determine whether the target phase energy storage battery module is configured with redundancy control function;

[0022] Based on the preset redundancy number 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, including:

[0023] If the target phase energy storage battery module is configured with redundancy control function, 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 according to the preset redundancy number.

[0024] In some optional embodiments, the three-phase energy storage battery module is provided with a valve control corresponding to each energy storage battery pack. The valve control is used to modulate the modulation signal of the energy storage converter of the corresponding energy storage battery pack.

[0025] Controlling the switching of the energy storage battery pack to be processed from the operating state to the hot standby state includes:

[0026] A modulation command is sent to the target valve control corresponding to the energy storage battery pack to be processed, so that the modulation signal amplitude of the modulation signal of the target energy storage converter of the energy storage battery pack to be processed by the target valve control is zero.

[0027] In some optional embodiments, when the three-phase energy storage battery modules of the energy storage unit are in operation, determining whether the intra-phase SOC of the target phase energy storage battery module is balanced includes:

[0028] When the three-phase energy storage battery module is in operation, multiple target SOCs of multiple target energy storage battery groups of the target phase energy storage battery module are collected, and each target SOC corresponds to one target energy storage battery group.

[0029] Calculate the target SOC dispersion of the target phase energy storage battery module based on multiple target SOCs;

[0030] Determine whether the intra-phase SOC of the target phase energy storage battery module is balanced based on the target SOC dispersion.

[0031] In some optional embodiments, determining whether the intra-phase SOC of the target phase energy storage battery module is balanced based on the target SOC dispersion includes:

[0032] If the target SOC dispersion is greater than or equal to the SOC dispersion threshold, the intra-phase SOC imbalance of the target phase energy storage battery module is determined.

[0033] When the target SOC dispersion is less than the SOC dispersion threshold, the intra-phase SOC balance of the target phase energy storage battery module is determined.

[0034] In some optional embodiments, the target SOC dispersion of the target phase energy storage battery module is calculated based on multiple target SOCs, including:

[0035] Calculate the mean and standard deviation of the target SOC based on multiple target SOCs;

[0036] The target SOC dispersion is calculated based on the target SOC mean and the target SOC standard deviation.

[0037] Secondly, embodiments of this application provide an in-phase SOC equalization control device, comprising:

[0038] The first determining module is used to determine whether the SOC of the target phase energy storage battery module is balanced 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.

[0039] The second 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 according to the preset redundancy number of the target phase energy storage battery module when the intra-phase SOC imbalance of the target phase energy storage battery module is determined.

[0040] The first control module is used to control the energy storage battery pack to be processed to switch from the running state to the hot standby state.

[0041] The second control module is used to control the energy storage battery pack to be processed to switch from hot standby state to running state when the intra-phase SOC of the target phase energy storage battery module is determined to be balanced.

[0042] Thirdly, embodiments of this application provide an energy storage system, including:

[0043] Memory;

[0044] One or more processors, coupled to memory;

[0045] 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.

[0046] 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.

[0047] 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

[0048] 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 are temporarily shut down according to the preset redundancy quantity 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 modules is restored. This can suppress the occurrence of the bottleneck effect and help improve the energy efficiency of the energy storage unit.

[0049] It is understood that the beneficial effects of the second to fifth aspects of this application can be found in the relevant description of the first aspect of this application, and will not be repeated here.

[0050] It should be understood that the above general description and the following detailed description are merely exemplary and explanatory, and are not intended to limit the technical solutions of this application. Attached Figure Description

[0051] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application 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 the drawings without creative effort.

[0052] Figure 1 shows a schematic diagram of a scenario of the energy storage system provided in an embodiment of this application.

[0053] Figure 2 shows a flowchart of an intra-phase SOC equalization control method provided in an embodiment of this application.

[0054] Figure 3 shows a schematic diagram of a scenario of the modulation signal in the in-phase SOC equalization control method provided in the embodiments of this application.

[0055] Figure 4 shows another scenario diagram of the modulation signal in the in-phase SOC equalization control method provided in the embodiments of this application.

[0056] Figure 5 shows another schematic flowchart of the intra-phase SOC equalization control method provided in the embodiments of this application.

[0057] 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.

[0058] Figure 7 shows a schematic diagram of a scenario of the intra-phase SOC equalization control method provided in an embodiment of this application.

[0059] Figure 8 shows a schematic diagram of a phase sequence scenario in the intra-phase SOC equalization control method provided in the embodiments of this application.

[0060] Figure 9 shows another schematic flowchart of the intra-phase SOC equalization control method provided in the embodiments of this application.

[0061] Figure 10 shows another schematic flowchart of the intra-phase SOC equalization control method provided in the embodiments of this application.

[0062] Figure 11 shows a structural block diagram of an in-phase SOC equalization control device provided in an embodiment of this application.

[0063] Figure 12 shows a functional block diagram of an energy storage system provided in an embodiment of this application.

[0064] Figure 13 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.

[0065] Figure 14 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

[0066] 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.

[0067] 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 collections thereof.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] To address the aforementioned issues, the phase-to-phase SOC balancing 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, determine whether the phase-to-phase SOC of the target phase energy storage battery module is balanced. 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 phase-to-phase SOC of the target phase energy storage battery module is unbalanced, the system determines the energy storage battery group to be processed from multiple target energy storage battery groups of the target phase energy storage battery module according to the preset redundancy number of the target phase energy storage battery module, and controls the processing of the energy storage battery group to be processed. The system switches the energy storage battery pack from the operating state to the hot standby state, and controls the energy storage battery pack to switch from the hot standby state to the 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 is temporarily taken out of operation according to the preset redundancy quantity 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.

[0075] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] The main control device 200 may be any one of, but not limited to, servers or terminal devices.

[0080] Servers can include, but are not limited to, independent physical servers, server clusters or distributed systems consisting of multiple physical servers, and cloud servers.

[0081] 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.).

[0082] 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.

[0083] 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.

[0084] Step 110: With the three-phase energy storage battery modules of the energy storage unit in operation, determine whether the SOC within the target phase energy storage battery module is balanced.

[0085] 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 device can determine whether the SOC within the target phase energy storage battery module is balanced.

[0086] Each phase of the three-phase energy storage battery module can be composed of multiple energy storage battery packs. 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 operating state can include, but is not limited to, the discharge state and the charging state.

[0087] Specifically, when the three-phase energy storage battery modules of the energy storage unit are in operation, the main control equipment can collect multiple target SOCs of multiple target energy storage battery modules of the target phase energy storage battery module, calculate the target SOC dispersion of the target phase energy storage battery module based on the multiple target SOCs, and determine whether the intra-phase SOC of the target phase energy storage battery module is balanced based on the target SOC dispersion. Judging whether the intra-phase SOC of the three-phase energy storage battery module is balanced based on the target SOC dispersion of the target phase energy storage battery module helps to improve the accuracy of the determination of the intra-phase SOC balance of the three-phase energy storage battery module.

[0088] Each target SOC can correspond to a target energy storage battery pack. The target SOC dispersion can be used to characterize the degree of dispersion of multiple target SOCs of multiple target energy storage battery packs. The smaller the target SOC dispersion, the more concentrated the distribution of multiple target SOCs. The larger the target SOC dispersion, the more dispersed the distribution of multiple target SOCs.

[0089] If the target SOC dispersion is greater than or equal to the SOC dispersion threshold, the intra-phase SOC imbalance of the target phase energy storage battery module is determined; if the target SOC dispersion is less than the SOC dispersion threshold, the intra-phase SOC balance of the target phase energy storage battery module is determined. Determining whether the intra-phase SOC of a three-phase energy storage battery module is balanced based on the target SOC dispersion and the SOC dispersion threshold of the target phase energy storage battery module helps improve the accuracy of determining the intra-phase SOC balance of the three-phase energy storage battery module.

[0090] The SOC dispersion threshold can be used to characterize the minimum SOC dispersion required for intra-phase SOC equalization of the target phase energy storage battery module. The SOC dispersion threshold can include, but is not limited to, a user-preset SOC dispersion, or an SOC dispersion automatically generated by the main control equipment based on the control process of multiple intra-phase SOC equalization controls of the three-phase energy storage battery module. The main control equipment can calculate the target SOC mean and target SOC standard deviation based on multiple target SOCs, and calculate the target SOC dispersion based on the target SOC mean and target SOC standard deviation. Calculating the target SOC dispersion based on the target SOC mean and target SOC standard deviation of the target phase energy storage battery module helps improve the accuracy of the target SOC dispersion calculation. As an example, multiple target SOCs can include SOC1, SOC2, ..., SOC... n The main control device can be based on SOC1, SOC2, ..., SOCn Calculate the target SOC mean according to Formula 1.

[0091] Formula 1 is: n represents SOC1, SOC2, ..., SOC n The quantity.

[0092] The main control device can be based on SOC1, SOC2, ..., SOC n Calculate the target SOC standard deviation σ according to Formula 2. SOC .

[0093] Formula 2 is: SOC i Let i be the i-th SOC.

[0094] The main control equipment can be based on and σ SOC Calculate the target SOC dispersion τ according to Formula 3. SOC .

[0095] Formula 3 is:

[0096] Regarding the process of the main control device acquiring multiple target SOCs of multiple target energy storage battery packs from the target phase energy storage battery module, in some embodiments, the energy storage system may further include a multi-phase Battery Management System (BMS) group. Each phase BMS group can correspond to one phase energy storage battery module. Each BMS in each phase BMS group is configured relative to one energy storage battery pack of the corresponding phase energy storage battery module. Each BMS can be used to acquire the SOC of a 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.

[0097] The main control device can broadcast and send acquisition commands to the target phase BMS group corresponding to the target phase energy storage battery module. Each target BMS in the target phase BMS group receives and responds to the acquisition command, acquires the SOC of the corresponding target energy storage battery group, obtains a target SOC, and sends a target SOC to the main control device. The main control device receives a target SOC returned by each target BMS, and obtains multiple target SOCs of multiple target energy storage battery groups.

[0098] Regarding the process of the main control device acquiring multiple target SOCs of multiple target energy storage battery packs of the target phase energy storage battery module, in some embodiments, the main control device can generate a first prompt message and receive multiple target SOCs of multiple target energy storage battery packs of the target phase energy storage battery module uploaded by the user according to the first prompt message.

[0099] The first prompt information can be used to prompt the user to upload multiple target SOCs of multiple target energy storage battery packs of the target phase energy storage battery module to the main control device. The first prompt information can include, but is not limited to, at least one of text prompt information, sound prompt information, and light prompt information.

[0100] Step 120: If it is determined that the SOC imbalance within the target phase energy storage battery module is not met, 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 according to the preset redundancy of the target phase energy storage battery module.

[0101] In this embodiment of the application, when the main control device determines that the SOC of the target phase energy storage battery module is unbalanced, it can obtain the preset redundancy of the target phase energy storage battery module and determine the energy storage battery group to be processed from multiple target energy storage battery groups of the target phase energy storage battery module according to the preset redundancy.

[0102] The preset redundancy quantity can be 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.

[0103] Regarding the process of the main control device obtaining the preset redundancy quantity of the target phase energy storage battery module, in some embodiments, the main control device pre-stores the preset redundancy quantity of the target phase energy storage battery module, and the main control device can read the pre-stored preset redundancy quantity.

[0104] Regarding the process by which the main control device obtains the preset redundancy quantity of the target phase energy storage battery module, in some embodiments, the main control device may generate a second prompt message and receive the preset redundancy quantity of the target phase energy storage battery module uploaded by the user based on the second prompt message.

[0105] The second prompt message can be used to prompt the user to upload the preset redundancy number of the target phase energy storage battery module to the main control device. The second prompt message can be, but is not limited to, at least one of text prompt messages, sound prompt messages, and light prompt messages.

[0106] Regarding the process by which the main control device determines the energy storage battery group to be processed from multiple target energy storage battery groups of the target phase energy storage battery module according to the preset redundancy number, in some embodiments, the main control device can select the target energy storage battery groups with a preset redundancy number from the target phase energy storage battery module according to the SOC size order of each target energy storage battery group in the target phase energy storage battery module, and obtain the energy storage battery group to be processed. Based on the SOC size order of the target phase energy storage battery module and the preset redundancy number, the energy storage battery group to be processed is determined. When the energy storage battery group to be processed is temporarily taken out of operation, it is beneficial to achieve the balance of the SOC within the three-phase energy storage battery module and to improve the control success rate of the balance control of the SOC within the three-phase energy storage battery module.

[0107] The order of SOC size can include, but is not limited to, the order of SOC from largest to smallest and the order of SOC from smallest to largest.

[0108] As one implementation method, the operating state can be a discharge state. The main control equipment can select target energy storage battery groups with a preset number of redundancies in the target phase energy storage battery module according to the SOC of each target energy storage battery group in the order of small to large, starting from the smallest target energy storage battery group corresponding to the smallest SOC, to obtain the energy storage battery group to be processed. When the energy storage unit is in the discharge state, the energy storage battery group with the smallest SOC and the preset number of redundancies is determined as the redundant energy storage battery group. When the redundant energy storage battery group is temporarily taken out of operation, 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 the balance control of the SOC within the three-phase energy storage battery module.

[0109] As an example, the SOC size order can be from small to large. The main control device can arrange multiple target energy storage battery packs in ascending order of SOC to obtain the first energy storage battery pack sequence, and select a preset number of target energy storage battery packs with redundancy starting from the first position of the first energy storage battery pack sequence to obtain the energy storage battery pack to be processed.

[0110] As one implementation method, the operating state can be a charging state. The main control device can select target energy storage battery groups with a preset number of redundancies in descending order of SOC of each target energy storage battery group in the target phase energy storage battery module, starting from the target energy storage battery group with the largest SOC. This results in 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 the largest SOC and the preset number of redundancies is determined as the redundant energy storage battery group. When the redundant energy storage battery group is temporarily removed, it is beneficial to achieve the balance of the SOC within the three-phase energy storage battery module and improve the control success rate of balancing the SOC within the three-phase energy storage battery module.

[0111] As an example, the SOC size order can be from largest to smallest. The main control device can arrange multiple target energy storage battery packs in descending order of SOC to obtain a second energy storage battery pack sequence. Starting from the first position of the second energy storage battery pack sequence, a preset number of target energy storage battery packs with redundancy are selected sequentially to obtain the energy storage battery pack to be processed.

[0112] Step 130: Control the energy storage battery pack to be processed to switch from the running state to the hot standby state.

[0113] In this embodiment of the application, the main control device can control the energy storage battery pack to be processed to switch from the running state to the hot standby state.

[0114] 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.

[0115] In some implementations, the three-phase energy storage battery module may be equipped with valve control corresponding to each energy storage battery pack. The valve control can be used to modulate the modulation signal of the power conversion system (PCS) of the corresponding energy storage battery pack. Each PCS can be communicatively connected to the main control device and exchange data with the main control device.

[0116] The main control device can send modulation commands to the target valve control corresponding to the energy storage battery pack to be processed. The target valve control receives and responds to the modulation command, and modulates the amplitude of the modulation signal of the target PCS of the energy storage battery pack to be processed to zero, as shown in Figure 3, so that the energy storage battery pack to be processed switches from the running state to the hot standby state. Based on the target valve control, 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 is beneficial to improving the operational stability of the energy storage unit.

[0117] 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.

[0118] 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.

[0119] The main control equipment can send control commands to the target bypass switch corresponding to the energy storage battery pack to be processed. The target bypass switch receives and responds to the 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.

[0120] 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.

[0121] Step 140: After determining that the SOC of the target phase energy storage battery module has been restored to equilibrium, control the energy storage battery pack to be processed to switch from hot standby state to running state.

[0122] In this embodiment, when the main control device determines that the SOC of the target phase energy storage battery module has been restored to equilibrium, it can control the energy storage battery pack to be processed to switch from hot standby state to running 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 not balanced, the energy storage battery pack is temporarily shut down according to the preset redundancy number 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.

[0123] In some implementations, a valve control corresponding to each energy storage battery can be set in the three-phase energy storage battery module. When the main control device determines that the SOC of the target phase energy storage battery module has been restored to equilibrium, it can send a first recovery command to the target valve control. The target valve control receives and responds to the first recovery command and restores the amplitude of the modulation signal of the target PCS to a preset amplitude, so that the energy storage battery group to be processed switches from the hot standby state to the running state.

[0124] The preset amplitude can be used to characterize the modulation signal of the target energy storage battery pack during normal operation, as shown in Figure 4. The preset amplitude may include, but is not limited to, the adjustment signal amplitude preset by the user, or the adjustment signal amplitude automatically generated by the main control device based on the control process of equalizing the SOC of the three-phase energy storage battery module multiple times.

[0125] 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 second recovery command to the target bypass switch. The target bypass switch receives and responds to the second recovery command, and the target bypass switch is opened to disconnect and bypass 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.

[0126] The solution provided in this application, when the three-phase energy storage battery modules of the energy storage unit are in operation, determines whether the SOC within the target phase energy storage battery module is balanced. If the SOC within the target phase energy storage battery module is determined to be unbalanced, a battery pack to be processed is selected from multiple target energy storage battery packs of the target phase energy storage battery module according to the preset redundancy quantity. The battery pack to be processed is then controlled to switch from the operating state to the hot standby state. When the SOC within the target phase energy storage battery module is determined to be balanced, the battery pack to be processed is controlled to switch from the hot standby state to the operating state. During the operation of the energy storage unit, if the SOC within the three-phase energy storage battery modules of the energy storage unit is unbalanced, the battery pack is temporarily taken out of operation according to the preset redundancy quantity until the SOC within the three-phase energy storage battery modules is balanced, at which point the temporarily taken-out battery pack is put back into operation. This can suppress the occurrence of the bottleneck effect and is conducive to improving the energy efficiency of the energy storage unit.

[0127] 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 210 to 250.

[0128] Step 210: With the three-phase energy storage battery modules of the energy storage unit in operation, determine whether the SOC within the target phase energy storage battery module is balanced.

[0129] In this embodiment, step 210 can be referred to the corresponding steps in the previous embodiments, and will not be repeated here.

[0130] Step 220: If it is determined that the SOC of the target phase energy storage battery module is unbalanced within the phase, determine whether the target phase energy storage battery module is configured with redundancy control function.

[0131] In this embodiment, when the main control device determines that the SOC of the target phase energy storage battery module is unbalanced within the phase, it can determine whether the target phase energy storage battery module is configured with redundancy control function.

[0132] The main control device can obtain the configuration parameters of the target phase energy storage battery module and determine whether the target phase energy storage battery module is configured with redundant control function based on the configuration parameters.

[0133] If the configuration parameters contain keywords that characterize redundancy control functionality, it is determined that the target phase energy storage battery module is configured with redundancy control functionality; if the configuration parameters do not contain keywords that characterize redundancy control functionality, it is determined that the target phase energy storage battery module is not configured with redundancy control functionality.

[0134] Keywords used to characterize redundancy control functions may include, but are not limited to, any one of "number of redundant energy storage batteries" or "redundancy quantity".

[0135] Step 230: If it is determined that the target phase energy storage battery module is configured with redundancy control function, determine the energy storage battery group to be processed from multiple target energy storage battery groups of the target phase energy storage battery module according to the preset redundancy number.

[0136] In this embodiment, when the main control device determines that the target phase energy storage battery module is configured with redundancy control function, it 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 according to the preset redundancy number. When it is determined that the target phase energy storage battery module is configured with redundancy control function, determining the energy storage battery group to be processed according to the preset redundancy number can reduce the occurrence of operation failure of the energy storage unit caused by mistakenly controlling the energy storage battery group to temporarily withdraw from operation as a redundant energy storage battery group when the target phase energy storage battery module is not configured with redundancy control function, which is conducive to improving the operation stability of the energy storage unit.

[0137] Step 240: Control the energy storage battery pack to be processed to switch from the running state to the hot standby state.

[0138] Step 250: After determining that the SOC of the target phase energy storage battery module has been restored to equilibrium, control the energy storage battery pack to be processed to switch from hot standby state to running state.

[0139] In this embodiment, steps 240 and 250 can be referred to the corresponding steps in the previous embodiments, and will not be repeated here.

[0140] 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.

[0141] Phase A energy storage battery module can be connected to the three-phase bus of the power grid through the first grid-connected reactor (Lb1), Phase B energy storage battery module can be connected to the three-phase bus of the power grid through the second grid-connected reactor (Lb2), and Phase C energy storage battery module can be connected to the three-phase bus of the power grid through the third grid-connected reactor (Lb3).

[0142] 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).

[0143] 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.

[0144] 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.

[0145] Each energy storage battery pack can also be connected to a valve controller, and each valve controller can be used to control the operation of a corresponding BMS and a PCS.

[0146] 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 301 to 310.

[0147] Step 301: Start the energy storage unit and collect the SOC of multiple energy storage battery packs in each phase energy storage battery module.

[0148] Each SOC corresponds to one energy storage battery pack of a phase energy storage battery module.

[0149] Step 302: Determine whether the target phase energy storage battery module is configured with redundancy control function.

[0150] If it is determined that the target phase energy storage battery module is configured with redundancy control function, proceed to step 303;

[0151] If it is determined that the target phase energy storage battery module is not configured with redundancy control function, proceed to step 310.

[0152] Step 303: Obtain the preset redundancy quantity of the target phase energy storage battery module.

[0153] Step 304: When the energy storage unit is in a discharging state, select the target energy storage battery group corresponding to the minimum target SOC with the preset redundancy quantity as the energy storage battery group to be processed.

[0154] Step 305: When the energy storage unit is in the charging state, select the target energy storage battery group corresponding to the maximum target SOC with the preset redundancy quantity as the energy storage battery group to be processed.

[0155] Step 306: Control the energy storage battery pack to be processed to switch from the running state to the hot standby state.

[0156] Step 307: Determine whether the SOC of the operating target energy storage battery pack and the energy storage battery pack to be processed in the target phase energy storage battery module is balanced.

[0157] Specifically, a SOC difference between each target energy storage battery pack and the energy storage battery pack to be processed can be calculated to obtain multiple SOC differences. Based on these multiple SOC differences, it can be determined whether the SOC of the target energy storage battery pack and the energy storage battery pack to be processed are balanced.

[0158] If there is a SOC difference greater than or equal to the SOC difference threshold among multiple SOC differences, it is determined that the SOC of the target energy storage battery pack and the energy storage battery pack to be processed are unbalanced, and the process returns to step 306; if there is no SOC difference greater than or equal to the SOC difference threshold among multiple SOC differences, it is determined that the SOC of the target energy storage battery pack and the energy storage battery pack to be processed are balanced, and the process proceeds to step 308.

[0159] The SOC difference threshold can be used to characterize the minimum SOC difference between the energy storage battery pack to be processed and the target energy storage battery pack. The SOC difference threshold may include, but is not limited to, the SOC difference preset by the user, or the SOC difference automatically generated by the main control equipment based on the control process of balancing the SOC of the three-phase energy storage battery module in multiple phases.

[0160] Step 308: Control the energy storage battery pack to be processed to switch from hot standby state to running state.

[0161] Step 309: Determine whether the SOC within the target phase energy storage battery module is balanced.

[0162] If it is determined that the SOC of the target phase energy storage battery module is unbalanced within the phase, return to step 303; if it is determined that the SOC of the target phase energy storage battery module is balanced within the phase, proceed to step 310.

[0163] Step 310: Operate the energy storage unit normally.

[0164] It should be noted that in the intra-phase SOC equalization control method shown in Figure 7, the number of target energy storage battery packs that are temporarily taken out of operation is less than or equal to the preset redundancy number. The operation of the energy storage unit will not be affected by the intra-phase SOC equalization control process. The output voltage of the energy storage unit is less affected by negative sequence and zero sequence interference, and the output voltage is only positive sequence, as shown in Figure 8, where line 1 is positive sequence, line 2 is negative sequence, and line 3 is zero sequence, which improves the operational stability of the energy storage unit.

[0165] The solution provided in this embodiment, when the three-phase energy storage battery modules of the energy storage unit are in operation, determines whether the SOC within the target phase energy storage battery module is balanced. If the SOC within the target phase energy storage battery module is determined to be unbalanced, it determines whether the target phase energy storage battery module is configured with redundancy control function. If the target phase energy storage battery module is configured with redundancy control function, it selects the energy storage battery group to be processed from multiple target energy storage battery groups of the target phase energy storage battery module according to a preset redundancy number, and controls the energy storage battery group to be processed to switch from the operating state. Switching to hot standby mode, and after determining that the SOC of the target phase energy storage battery module has been restored to equilibrium, the energy storage battery pack to be processed is controlled to switch from hot standby mode to operating mode. 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 is temporarily taken out of operation according to the preset redundancy quantity 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.

[0166] Furthermore, if the target phase energy storage battery module is configured with redundancy control function, the energy storage battery group to be processed can be determined according to the preset redundancy number. This can reduce the possibility of the energy storage unit failing due to the mistaken control of the energy storage battery group as a redundant energy storage battery group to temporarily withdraw from operation when the target phase energy storage battery module is not configured with redundancy control function, and is conducive to improving the operational stability of the energy storage unit.

[0167] Please refer to Figure 9, 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 9 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.

[0168] Step 410: With the three-phase energy storage battery modules of the energy storage unit in operation, determine whether the SOC within the target phase energy storage battery module is balanced.

[0169] Step 420: If it is determined that the SOC imbalance within the target phase energy storage battery module is not met, 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 according to the preset redundancy number of the target phase energy storage battery module.

[0170] Step 430: Control the energy storage battery pack to be processed to switch from the running state to the hot standby state.

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

[0172] Step 440: 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.

[0173] 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.

[0174] 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.

[0175] 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.

[0176] 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 4 based on the current number n1.

[0177] Formula 4 is: θ1 = 360° / n1.

[0178] Step 450: Control the operation of the current energy storage battery pack according to the current phase shift angle.

[0179] In this embodiment, the main control device can control the operation of the current energy storage battery pack according to the current phase shift angle. When the energy storage battery pack is temporarily taken out of operation according to the preset redundancy number, 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.

[0180] Step 460: After determining that the SOC of the target phase energy storage battery module has been restored to equilibrium, control the energy storage battery pack to be processed to switch from hot standby state to running state.

[0181] In this embodiment, step 460 can be referred to the corresponding steps in the previous embodiments, and will not be repeated here.

[0182] The solution provided in this embodiment, when the three-phase energy storage battery modules of the energy storage unit are in operation, determines whether the SOC within the phase of the target phase energy storage battery module is balanced. If it is determined that the SOC within the phase of the target phase energy storage battery module is unbalanced, it selects a battery group to be processed from multiple target energy storage battery groups of the target phase energy storage battery module according to the preset redundancy number, and controls the battery group to be processed to switch from the operating state to the hot standby state. Furthermore, it determines the current phase shift angle of the current target energy storage battery group based on the current number of target energy storage battery groups, and then... The current phase shift angle controls the operation of the current energy storage battery pack. 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 hot standby to operation. 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 is temporarily taken out of operation according to the preset redundancy quantity until the SOC of the three phase energy storage battery modules is balanced. 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.

[0183] Furthermore, when the energy storage battery pack is temporarily taken out of operation according to the preset redundancy number, 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 controlling the currently operating energy storage battery packs based on the phase shift angle.

[0184] Please refer to Figure 10, 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 process shown in Figure 10 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 510 to 560.

[0185] Step 510: With the three-phase energy storage battery modules of the energy storage unit in operation, determine whether the SOC within the target phase energy storage battery module is balanced.

[0186] Step 520: If it is determined that the SOC imbalance within the target phase energy storage battery module is not met, 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 according to the preset redundancy number of the target phase energy storage battery module.

[0187] Step 530: Control the energy storage battery pack to be processed to switch from the running state to the hot standby state.

[0188] Step 540: After determining that the SOC of the target phase energy storage battery module has been restored to equilibrium, control the energy storage battery pack to be processed to switch from hot standby state to running state.

[0189] In this embodiment, steps 510, 520, 530 and 540 can be referred to the corresponding steps in the previous embodiments, and will not be repeated here.

[0190] Step 550: 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.

[0191] 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.

[0192] The target phase shift angle can be used to characterize the phase difference between the PWM signals of multiple target energy storage battery packs.

[0193] 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 5 based on the target number n2.

[0194] Formula 5 is: θ2 = 360° / n2.

[0195] Step 560: Control the operation of multiple target energy storage battery packs according to the target phase shift angle.

[0196] 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.

[0197] The solution provided in this embodiment, when the three-phase energy storage battery modules of the energy storage unit are in operation, determines whether the SOC (State of Charge) within the target phase energy storage battery module is balanced. If the SOC within the target phase energy storage battery module is determined to be unbalanced, a battery pack to be processed is selected from multiple target energy storage battery packs of the target phase energy storage battery module according to the preset redundancy quantity. The battery pack to be processed is then controlled to switch from the operating state to the hot standby state. Finally, if the SOC within the target phase energy storage battery module is determined to be restored to balance, the battery pack to be processed is controlled to switch from the hot standby state to the hot standby state. The system switches from standby to operating status and determines the target phase shift angle of multiple target energy storage battery packs based on the target number of target energy storage battery packs. It then controls the operation of multiple target energy storage battery packs based on the target phase shift angle. During the operation of the energy storage unit, if the SOC of the three-phase energy storage battery modules is unbalanced, the system controls the energy storage battery packs to temporarily shut down based on the preset redundancy number. The system resumes operation of the temporarily shut-down energy storage battery packs once the SOC of the three-phase energy storage battery modules is balanced. This can suppress the occurrence of the bottleneck effect and help improve the energy efficiency of the energy storage unit.

[0198] 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.

[0199] Please refer to Figure 11, 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 11 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 first determining module 610, a second determining module 620, a first control module 630, and a second control module 640.

[0200] The first determining module 610 can be used to determine whether the SOC of the target phase energy storage battery module is balanced 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 second determining 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 according to the preset redundancy number of the target phase energy storage battery module when it is determined that the SOC of the target phase energy storage battery module is unbalanced. The first control module 630 can be used to control the energy storage battery group to be processed to switch from the operating state to the hot standby state. The second control module 640 can be used to control the energy storage battery group to be processed to switch from the hot standby state to the operating state when it is determined that the SOC of the target phase energy storage battery module has been restored to balance.

[0201] In some implementations, the second determining module 620 may include a selection unit.

[0202] The selection unit can be used to select a preset number of target energy storage battery groups from the target phase energy storage battery module according to the SOC size order of each target energy storage battery group in the target phase energy storage battery module, so as to obtain the energy storage battery group to be processed.

[0203] In some implementations, the operating state can be a discharge state, and the selection unit may include a first selection subunit.

[0204] The first selection subunit can be used to select target energy storage battery groups with a preset redundancy number in order of increasing SOC of each target energy storage battery group in the target phase energy storage battery module, starting from the smallest target energy storage battery group corresponding to the smallest SOC, to obtain the energy storage battery group to be processed.

[0205] In some implementations, the operating state can be a charging state, and the selection unit may include a second selection subunit.

[0206] The second selection subunit can be used to select target energy storage battery groups with a preset number of redundancies in the order of SOC of each target energy storage battery group in the target phase energy storage battery module from largest to smallest, starting from the largest target energy storage battery group corresponding to the largest SOC, to obtain the energy storage battery group to be processed.

[0207] In some implementations, the in-phase SOC equalization control device 600 may further include a third determining module.

[0208] The third determining module can be used by the second determining module 620 to determine whether the target phase energy storage battery module is configured with redundancy control function 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 according to the preset redundancy number of the target phase energy storage battery module.

[0209] In some implementations, the second determining module 620 may include the first determining unit.

[0210] The first determining unit 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 according to a preset redundancy number when it is determined that the target phase energy storage battery module is configured with redundancy control function.

[0211] In some implementations, the three-phase energy storage battery module may be equipped with valve control corresponding to each energy storage battery pack. The valve control can be used to modulate the modulation signal of the energy storage converter of the corresponding energy storage battery pack; the first control module 630 may include a transmitting unit.

[0212] The transmitting unit can be used to send modulation commands to the target valve control corresponding to the energy storage battery pack to be processed, so that the modulation signal amplitude of the modulation signal of the target energy storage converter of the energy storage battery pack to be processed is zero.

[0213] In some implementations, the first determining module 610 may include a data acquisition unit, a calculation unit, and a second determining unit.

[0214] The acquisition unit can be used to acquire multiple target SOCs of multiple target energy storage battery groups of the target phase energy storage battery module when the three-phase energy storage battery module is in operation. Each target SOC can correspond to one target energy storage battery group. The calculation unit can be used to calculate the target SOC dispersion of the target phase energy storage battery module based on multiple target SOCs. The second determination unit can be used to determine whether the intra-phase SOC of the target phase energy storage battery module is balanced based on the target SOC dispersion.

[0215] In some implementations, the second determining unit may include a first determining subunit and a second determining subunit.

[0216] The first determining subunit can be used to determine the intra-phase SOC imbalance of the target phase energy storage battery module when the target SOC dispersion is greater than or equal to the SOC dispersion threshold; the second determining subunit can be used to determine the intra-phase SOC balance of the target phase energy storage battery module when the target SOC dispersion is less than the SOC dispersion threshold.

[0217] In some implementations, the computing unit may be a first computing subunit and a second computing subunit.

[0218] The first calculation subunit can be used to calculate the target SOC mean and target SOC standard deviation based on multiple target SOCs respectively; the second calculation subunit can be used to calculate the target SOC dispersion based on the target SOC mean and target SOC standard deviation.

[0219] The solution provided in this embodiment determines whether the SOC of the target phase energy storage battery module is balanced when the three-phase energy storage battery module of the energy storage unit is in operation. If the SOC of the target phase energy storage battery module is not balanced, the solution selects the energy storage battery group to be processed from multiple target energy storage battery groups of the target phase energy storage battery module according to the preset redundancy number, and controls the energy storage battery group to be processed to switch from the operating state to the hot standby state. If the SOC of the target phase energy storage battery module is restored to balance, the solution controls the energy storage battery group to switch 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 module of the energy storage unit is not balanced, the solution controls the energy storage battery group to temporarily stop operating according to the preset redundancy number until the SOC of the three-phase energy storage battery module is balanced, and then resumes the operation of the energy storage battery group that has been temporarily stopped. This can suppress the occurrence of the bottleneck effect and help improve the energy efficiency of the energy storage unit.

[0220] 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.

[0221] 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.

[0222] Please refer to Figure 12, 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.

[0223] The memory 710 may include random access memory (RAM) or read-only memory (ROM). The memory 710 can 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 (e.g., determining whether the intra-phase SOC of the target phase energy storage battery module is balanced, determining whether the intra-phase SOC of the target phase energy storage battery module is unbalanced, determining the energy storage battery pack to be processed, controlling the switch from the operating state to the hot standby state, determining that the intra-phase SOC of the target phase energy storage battery module has been restored to balance, controlling the switch from the hot standby state to the operating state, selecting a target energy storage battery pack with a preset redundancy number, determining whether a redundancy control function is configured, determining that a redundancy control function is configured, sending a modulation command, modulating the modulation signal amplitude to zero, acquiring multiple target SOCs, calculating the target SOC dispersion, determining the intra-phase SOC balance of the target phase energy storage battery module, calculating the target SOC mean, and calculating the target SOC standard deviation, 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 units, three-phase energy storage battery modules, operating status, target phase energy storage battery modules, preset redundancy quantity, multiple target energy storage battery groups, energy storage battery groups to be processed, hot standby status, SOC size order, SOC from smallest to largest order, minimum SOC, minimum target energy storage battery group, charging status, SOC from largest to smallest order, maximum SOC, maximum target energy storage battery group, redundancy control function, valve control, energy storage converter, modulation signal, modulation command, target valve control, target energy storage converter, modulation signal amplitude, multiple target SOC, target SOC dispersion, SOC dispersion threshold, target SOC mean, and target SOC standard deviation), etc.

[0224] 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.

[0225] Please refer to Figure 13, 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.

[0226] 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.

[0227] Please refer to Figure 14, 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 method described in the above method embodiments.

[0228] The solution provided in this embodiment determines whether the SOC of the target phase energy storage battery module is balanced when the three-phase energy storage battery module of the energy storage unit is in operation. If the SOC of the target phase energy storage battery module is not balanced, the solution selects the energy storage battery group to be processed from multiple target energy storage battery groups of the target phase energy storage battery module according to the preset redundancy number, and controls the energy storage battery group to be processed to switch from the operating state to the hot standby state. If the SOC of the target phase energy storage battery module is restored to balance, the solution controls the energy storage battery group to switch 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 module of the energy storage unit is not balanced, the solution controls the energy storage battery group to temporarily stop operating according to the preset redundancy number until the SOC of the three-phase energy storage battery module is balanced, and then resumes the operation of the energy storage battery group that has been temporarily stopped. This can suppress the occurrence of the bottleneck effect and help improve the energy efficiency of the energy storage unit.

[0229] 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 modules of the energy storage unit are in operation, determine whether the SOC within the target phase energy storage battery module is balanced. The target phase energy storage battery module is at least one phase energy storage battery module among the three-phase energy storage battery modules. If it is determined that the SOC imbalance within the target phase energy storage battery module is not met, 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 according to the preset redundancy number of the target phase energy storage battery module. Control the energy storage battery pack to be processed to switch from the operating state to the hot standby state; When it is determined that the intraphase SOC of the target phase energy storage battery module has been restored to equilibrium, the energy storage battery pack to be processed is controlled to switch from the hot standby state to the operating state.

2. The method according to claim 1, wherein, 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 according to the preset redundancy number of the target phase energy storage battery module includes: Based on the SOC size order of each target energy storage battery group in the target phase energy storage battery module, the preset number of target energy storage battery groups are selected sequentially from the target phase energy storage battery module to obtain the energy storage battery group to be processed.

3. The method according to claim 2, wherein, The operating state is a discharge state. The step involves selecting a preset number of target energy storage battery groups from the target phase energy storage battery module according to the SOC (State of Charge) order of each target energy storage battery group in the target phase energy storage battery module, to obtain the energy storage battery group to be processed, including: Based on the SOC of each target energy storage battery group in the target phase energy storage battery module from smallest to largest, the target energy storage battery groups with the preset redundancy number are selected in sequence to obtain the energy storage battery group to be processed.

4. The method according to claim 2, wherein, The operating state is a charging state. The step involves sequentially selecting the preset number of target energy storage battery groups from the target phase energy storage battery module according to the SOC size order of each target energy storage battery group in the target phase energy storage battery module, to obtain the energy storage battery group to be processed, including: Based on the order of SOC of each target energy storage battery group in the target phase energy storage battery module from largest to smallest, the target energy storage battery groups with the preset redundancy number are selected in sequence to obtain the energy storage battery group to be processed.

5. The method according to any one of claims 1 to 4, 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 according to the preset redundancy number of the target phase energy storage battery module, the method further includes: Determine whether the target phase energy storage battery module is configured with redundancy control function; 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 according to the preset redundancy number of the target phase energy storage battery module includes: If it is determined that the target phase energy storage battery module is configured with a redundancy control function, 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 according to the preset redundancy number.

6. The method according to claim 5, wherein, The step of determining whether the target phase energy storage battery module is configured with redundancy control function includes: Obtain the configuration parameters of the target energy storage battery module; The redundancy control function is configured for the target phase energy storage battery module based on the configuration parameters.

7. The method according to claim 6, wherein, The step of determining whether the target phase energy storage battery module is configured with redundancy control function based on the configuration parameters includes: If the configuration parameters contain keywords for characterizing redundancy control functions, it is determined that the target phase energy storage battery module is configured with redundancy control functions. If the configuration parameters do not contain keywords for characterizing redundancy control functions, it is determined that the target phase energy storage battery module is not configured with redundancy control functions.

8. The method according to any one of claims 1 to 7, wherein, The three-phase energy storage battery module is equipped with a valve control corresponding to each energy storage battery pack. The valve control is used to modulate the modulation signal of the energy storage converter of the corresponding energy storage battery pack. The control of switching the energy storage battery pack to be processed from the operating state to the hot standby state includes: A modulation command is sent to the target valve control corresponding to the energy storage battery pack to be processed, so that the modulation signal amplitude of the modulation signal of the target energy storage converter of the energy storage battery pack to be processed by the target valve control is zero.

9. The method according to any one of claims 1 to 7, 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 control of switching the energy storage battery pack to be processed from the operating state to the hot standby state includes: A 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 bypasses the energy storage battery pack to be processed.

10. The method according to any one of claims 1 to 9, wherein, The determination of whether the SOC within the target phase of the energy storage battery module is balanced when 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 the operating state, multiple target SOCs of the multiple target energy storage battery groups of the target phase energy storage battery module are collected, and each target SOC corresponds to one target energy storage battery group. Calculate the target SOC dispersion of the target phase energy storage battery module based on the multiple target SOCs; The intra-phase SOC of the target phase energy storage battery module is determined based on the target SOC dispersion.

11. The method according to claim 10, wherein, The step of determining whether the intra-phase SOC of the target phase energy storage battery module is balanced based on the target SOC dispersion includes: If the target SOC dispersion is greater than or equal to the SOC dispersion threshold, it is determined that the intra-phase SOC imbalance of the target phase energy storage battery module is determined. If the target SOC dispersion is less than the SOC dispersion threshold, the intra-phase SOC balance of the target phase energy storage battery module is determined.

12. The method according to claim 10 or 11, wherein, The step of calculating the target SOC dispersion of the target phase energy storage battery module based on the multiple target SOCs includes: Calculate the mean and standard deviation of the target SOC based on the multiple target SOCs respectively; The target SOC dispersion is calculated based on the target SOC mean and the target SOC standard deviation.

13. The method according to any one of claims 10 to 12, 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. When the three-phase energy storage battery module is in the operating state, the method of collecting multiple target SOCs of the multiple target energy storage battery groups of the target phase energy storage battery module includes: When the three-phase energy storage battery module is in the operating state, a data acquisition 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 acquires the SOC of the corresponding target energy storage battery group, obtains a target SOC, and returns the target SOC. Receive the target SOC returned by each target battery management system to obtain the multiple target SOCs.

14. The method according to any one of claims 1 to 13, wherein, The three-phase energy storage battery module is equipped with a valve control corresponding to each energy storage battery pack. The valve control is used to modulate the modulation signal of the energy storage converter of the corresponding energy storage battery pack. The step of controlling the energy storage battery pack to be processed to switch from the hot standby state to the operating state when the intra-phase SOC of the target phase energy storage battery module is determined to be balanced includes: When it is determined that the intra-phase SOC of the target phase energy storage battery module has been restored to equilibrium, a first recovery command is sent to the target valve control to restore the modulation signal amplitude of the modulation signal of the target energy storage converter of the energy storage battery pack to be processed to a preset amplitude.

15. 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. The step of controlling the energy storage battery pack to be processed to switch from the hot standby state to the operating state when the intra-phase SOC of the target phase energy storage battery module is determined to be balanced includes: If it is determined that the intra-phase SOC of the target energy storage battery module has been restored to equilibrium, a second recovery command is sent to the target bypass switch so that the target bypass switch disconnects the bypass of the energy storage battery pack to be processed.

16. The method according to any one of claims 1 to 15, wherein, Before controlling the energy storage battery pack to be processed to switch from the hot standby state to the operating state after determining that the intra-phase SOC of the target phase energy storage battery module has been restored to equilibrium, the method further includes: 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; The operation of the current energy storage battery pack is controlled based on the current phase shift angle.

17. The method according to any one of claims 1 to 16, wherein, After determining that the intra-phase SOC of the target phase energy storage battery module has been restored to equilibrium, and controlling the energy storage battery pack to be processed to switch 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.

18. An intra-phase SOC equalization control device, wherein, include: The first determining module is used to determine whether the SOC of the target phase energy storage battery module is balanced 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 among the three-phase energy storage battery modules. The second 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 according to the preset redundancy number of the target phase energy storage battery module when it is determined that the intra-phase SOC of the target phase energy storage battery module is unbalanced. The first control module is used to control the energy storage battery pack to be processed to switch from the operating state to the hot standby state. The second control module is used to control the energy storage battery pack to be processed to switch from the hot standby state to the operating state when it is determined that the intra-phase SOC of the target phase energy storage battery module has been 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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