Method and apparatus for power distribution of an energy storage system

Abstract

The embodiment of the present application provides a method and device for power distribution of an energy storage system, which can reduce the possibility of invalid power distribution of the energy storage unit, thereby improving the efficiency of power distribution. The energy storage system comprises a plurality of energy storage units, and the method comprises the following steps: acquiring state parameters and charge-discharge states of the plurality of energy storage units, wherein the state parameters comprise voltage values and / or SOC values; in the case that a first voltage difference between a first voltage value and a second voltage value is greater than or equal to a voltage preset value, and / or a first SOC difference between a first SOC value and a second SOC value is greater than or equal to an SOC preset value, performing power distribution on the plurality of energy storage units according to the state parameters and the charge-discharge states of the plurality of energy storage units, wherein the first voltage value and the second voltage value are two voltage values in the voltage values, and the first SOC value and the second SOC value are two SOC values in the SOC values.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, and in particular to a method and apparatus for power distribution in an energy storage system. Background Technology

[0002] With the large-scale grid connection of renewable energy sources (such as photovoltaic and wind power) and the widespread adoption of electric vehicles, energy storage systems are playing an increasingly prominent role in grid peak shaving, frequency regulation, and stable microgrid operation. Energy storage systems typically consist of multiple battery packs, supercapacitors, and other units, and the rationality of their power allocation can affect the system's efficiency, lifespan, and other performance characteristics. For example, in grid-scale energy storage power stations, the charging and discharging power of different energy storage units needs to be dynamically allocated to cope with load fluctuations.

[0003] Therefore, how to effectively allocate power is an urgent problem to be solved. Summary of the Invention

[0004] This application provides a method and apparatus for power allocation in an energy storage system, which can reduce the possibility of ineffective power allocation to energy storage units, thereby improving the efficiency of power allocation.

[0005] In a first aspect, a method for power allocation in an energy storage system is provided, the energy storage system comprising multiple energy storage units, the method comprising: acquiring state parameters and charge / discharge states of the multiple energy storage units, the state parameters including voltage values ​​and / or state of charge (SOC) values; and, when a first voltage difference between a first voltage value and a second voltage value is greater than or equal to a preset voltage value, and / or a first SOC difference between a first SOC value and a second SOC value is greater than or equal to a preset SOC value, performing power allocation on the multiple energy storage units according to the state parameters and the charge / discharge states, wherein the first voltage value and the second voltage value are two voltage values ​​among the voltage values, and the first SOC value and the second SOC value are two SOC values ​​among the SOC values.

[0006] When the difference between two voltage values ​​of multiple energy storage units exceeds a preset voltage value, and / or the difference between two SOC values ​​of multiple energy storage units exceeds a preset SOC value, it indicates that at least two energy storage units have significant differences in their SOC and / or voltage values, necessitating power allocation. Therefore, this embodiment of the application performs power allocation only when power allocation among multiple energy storage units is required, reducing the possibility of ineffective power allocation and improving the efficiency of power allocation.

[0007] Furthermore, the power allocated to an energy storage unit may differ depending on its charge / discharge state. For example, if an energy storage unit is charging and has a high voltage, it may receive less power; conversely, if it is discharging and has a high voltage, it may receive more power. Therefore, this technical solution, by allocating power to multiple energy storage units based on their charge / discharge state, can effectively improve the accuracy of power allocation, thereby increasing the charge / discharge capacity of the energy storage units and reducing the bottleneck effect. Moreover, since there is a close relationship between voltage and SOC values ​​and power, allocating power to multiple energy storage units based on voltage and / or SOC values ​​can further improve the accuracy of power allocation.

[0008] In some possible implementations, the first voltage value is the maximum value among the voltage values, the second voltage value is the minimum value among the voltage values, the first SOC value is the maximum value among the SOC values, and the second SOC value is the minimum value among the SOC values.

[0009] By setting the first voltage value and the second voltage value to the maximum and minimum values ​​among multiple voltage values, respectively, when the first voltage difference is greater than or equal to the preset voltage value, it can more effectively indicate that the voltage difference between multiple energy storage units is large and power allocation is required, further reducing the possibility of ineffective power allocation among multiple energy storage units.

[0010] In some possible implementations, the method further includes: obtaining at least one of the average allocated power of the plurality of energy storage units, the power limit value of each of the plurality of energy storage units, and the power limit value of the PCS; the step of allocating power to the plurality of energy storage units according to the state parameters of the plurality of energy storage units and the charge / discharge state includes: allocating power to the plurality of energy storage units according to at least one of the average allocated power, the power limit value of each of the energy storage units, and the power limit value of the PCS, and according to the charge / discharge state and the state parameters.

[0011] This technical solution allocates power to multiple energy storage units based on at least one of the following: average power distribution, power limit value of each energy storage unit, and power limit value of the PCS, as well as the charging / discharging state and state parameters. In other words, it allocates power to multiple energy storage units based on more parameters, which can further improve the accuracy of power allocation and ensure that the power allocated to each energy storage unit matches the specific situation of each energy storage unit.

[0012] In addition, during the power allocation process for multiple energy storage units, the power limit of the energy storage unit and the power limit of the PCS are taken into account. That is, the allowable charging and discharging power of the energy storage unit and the charging and discharging power of the PCS are taken into account. In this way, the power allocated to each energy storage unit can meet its own capacity requirements, so that the energy storage unit and the energy storage system can operate normally.

[0013] In some possible implementations, when the plurality of energy storage units are in a charging state, the power allocated to the first energy storage unit is the minimum of the following powers: the sum of the average allocated power and the first preset power value, the power limit value of the first energy storage unit, and the power limit value of the PCS, wherein the first energy storage unit is the energy storage unit with the smallest voltage value and / or the smallest SOC value among the plurality of energy storage units; the power allocated to the second energy storage unit is the minimum of the following powers: the difference between the average allocated power and the first preset power value, the power limit value of the first energy storage unit, and the power limit value of the PCS, wherein the second energy storage unit is the energy storage unit with the largest voltage value and / or the largest SOC value among the plurality of energy storage units.

[0014] During charging, the lower the SOC or voltage value of the energy storage unit, the more power it requires; conversely, the higher the SOC or voltage value, the less power it requires. Therefore, this technical solution uses the sum of the average allocated power and the first preset power value as elements in the set for the first energy storage unit, and the difference between the average allocated power and the first preset power value as elements for the second energy storage unit. This satisfies the actual needs of both the first and second energy storage units during charging. Furthermore, by taking the minimum value among the three elements, the power allocated to each energy storage unit meets its own capacity requirements, ensuring the normal operation of both the energy storage unit and the energy storage system.

[0015] In some possible implementations, when the plurality of energy storage units are in a discharging state, the power allocated to the first energy storage unit is the minimum of the following powers: the difference between the average allocated power and the second preset power value, the power limit value of the first energy storage unit, and the power limit value of the PCS, wherein the first energy storage unit is the energy storage unit with the smallest voltage value and / or the smallest SOC value among the plurality of energy storage units; the power allocated to the second energy storage unit is the minimum of the following powers: the sum of the average allocated power and the second preset power value, the power limit value of the first energy storage unit, and the power limit value of the PCS, wherein the second energy storage unit is the energy storage unit with the largest voltage value and / or the largest SOC value among the plurality of energy storage units.

[0016] During discharge, the lower the SOC or voltage value of the energy storage unit, the less power it requires; conversely, the higher the SOC or voltage value, the more power it requires. Therefore, this technical solution uses the difference between the average allocated power and the first preset power value as an element in the set for the first energy storage unit, and the sum of the average allocated power and the first preset power value as an element for the second energy storage unit. This satisfies the actual needs of both the first and second energy storage units during discharge. Furthermore, by taking the minimum value among the three elements, the power allocated to each energy storage unit meets its own capacity requirements, ensuring the normal operation of both the energy storage unit and the energy storage system.

[0017] In some possible implementations, the step of allocating power to the plurality of energy storage units based on the state parameters of the plurality of energy storage units and the charge / discharge state includes: determining a second voltage difference and / or a second SOC difference, wherein the second voltage difference is the difference between the voltage value of each energy storage unit and the average voltage value, the average voltage value being the average voltage value of the plurality of energy storage units; the second SOC difference is the difference between the SOC value of each energy storage unit and the average SOC value, the average SOC value being the average SOC value of the plurality of energy storage units; and allocating power to the plurality of energy storage units based on the charge / discharge state and based on the second voltage difference and / or the second SOC difference.

[0018] Since the magnitude of the second voltage difference and the second SOC difference are closely related to the power that the energy storage unit can be allocated, this technical solution can improve the accuracy of power allocation by allocating power to multiple energy storage units based on the second voltage difference and / or the second SOC difference.

[0019] In some possible implementations, the power allocation of the plurality of energy storage units based on the state of charge / discharge and based on the second voltage difference and / or the second SOC difference includes: allocating power to the plurality of energy storage units based on the state of charge / discharge and a first voltage ratio, wherein the first voltage ratio is the ratio between the second voltage difference and the average voltage.

[0020] In addition to the charging / discharging state and the second voltage difference, this technical solution also allocates power to multiple energy storage units based on the average voltage. That is, it allocates power to energy storage units based on more parameters, which can further improve the accuracy of power allocation.

[0021] In some possible implementations, the method further includes: determining the average power allocation of the plurality of energy storage units; the step of allocating power to the plurality of energy storage units according to the charge / discharge state and the first voltage ratio includes: allocating power to the plurality of energy storage units according to the charge / discharge state, the first voltage ratio and the average power allocation.

[0022] This technical solution, in addition to the first voltage ratio and charge / discharge state, also allocates power to multiple energy storage units based on the average power distribution. That is, it further allocates power to the energy storage units based on more parameters, ensuring that the power allocated to each energy storage unit matches its actual situation, thereby improving the accuracy of power allocation and the performance of the energy storage system. Furthermore, since the first voltage ratio is the ratio between the second voltage difference and the average voltage, and the average voltage corresponds to the average power distribution, this technical solution also allocates power to multiple energy storage units based on the average power distribution, making the power allocated to each energy storage unit more accurate.

[0023] In some possible implementations, the method further includes: determining the total SOC value of the plurality of energy storage units; the step of allocating power to the plurality of energy storage units according to the charge / discharge state and according to the second voltage difference and / or the second SOC difference includes: allocating power to the plurality of energy storage units according to the charge / discharge state and a first SOC ratio, wherein the first SOC ratio is the ratio between the second SOC difference and the total SOC value.

[0024] In addition to the second SOC difference and the state of charge / discharge, this technical solution also allocates power to multiple energy storage units based on the total SOC value. That is, it allocates power to energy storage units based on more parameters, which can further improve the accuracy of power allocation.

[0025] In some possible implementations, the method further includes: determining the average power allocation of the plurality of energy storage units; the step of allocating power to the plurality of energy storage units according to the state of charge / discharge and the first SOC ratio includes: allocating power to the plurality of energy storage units according to the state of charge / discharge, the first SOC ratio and the average power allocation.

[0026] In addition to the first SOC ratio, this technical solution also allocates power to multiple energy storage units based on the average power distribution. That is, it further allocates power to the energy storage units based on more parameters, so that the power allocated to each energy storage unit can match the actual situation of each energy storage unit, thereby further improving the accuracy of power allocation and the performance of the energy storage system.

[0027] In some possible implementations, the step of allocating power to the plurality of energy storage units based on the state parameters of the plurality of energy storage units and the charge / discharge state includes: when the plurality of energy storage units are in a discharge state, allocating power to the plurality of energy storage units according to a second voltage ratio, wherein the second voltage ratio is the ratio between the voltage value of each of the plurality of energy storage units and the total voltage value of the plurality of energy storage units; and / or allocating power to the plurality of energy storage units according to a second SOC ratio, wherein the second SOC ratio is the ratio between the SOC value of each of the plurality of energy storage units and the total SOC value of the plurality of energy storage units.

[0028] Since the voltage value of each energy storage unit and the total voltage value of multiple energy storage units are closely related to the power that can be allocated to each energy storage unit, this technical solution can improve the accuracy of power allocation by allocating power to multiple energy storage units according to the ratio between the voltage value of each energy storage unit and the total voltage value, and / or according to the ratio between the SOC value of each energy storage unit and the total SOC value when multiple energy storage units are in a discharging state.

[0029] In some possible implementations, the method further includes: obtaining the total charge / discharge power of the plurality of energy storage units; the power allocation of the plurality of energy storage units according to a second voltage ratio includes: allocating power of the plurality of energy storage units according to the total charge / discharge power and the second voltage ratio; and / or the power allocation of the plurality of energy storage units according to a second SOC ratio includes: allocating power of the plurality of energy storage units according to the total charge / discharge power and the second SOC ratio.

[0030] In addition to the second voltage ratio, this technical solution also allocates power based on the total charging and discharging power of multiple energy storage units. That is, it allocates power to multiple energy storage units based on more parameters, which can further improve the accuracy of power allocation.

[0031] In some possible implementations, the step of allocating power to the plurality of energy storage units based on their state parameters and charge / discharge states includes: when the plurality of energy storage units are in a charging state, allocating power to the plurality of energy storage units according to a third voltage ratio, wherein the third voltage ratio is the ratio between a third voltage value and a fourth voltage value, the third voltage value is the difference between the voltage value of each energy storage unit and its full charge voltage value, and the fourth voltage value is the sum of the plurality of third voltage values; and / or allocating power to the plurality of energy storage units according to a third SOC ratio, wherein the third SOC ratio is the ratio between a third SOC value and a fourth SOC value, the third SOC value is the difference between the SOC value of each energy storage unit and its full charge SOC value, and the fourth SOC value is the sum of the plurality of third SOC values.

[0032] Since the third voltage ratio and / or the third SOC ratio are closely related to the power that can be allocated to each energy storage unit during the charging state, this technical solution can improve the accuracy of power allocation by allocating power to multiple energy storage units according to the third voltage ratio and / or the third SOC ratio when multiple energy storage units are in the charging state.

[0033] In some possible implementations, the method further includes: obtaining the total charge / discharge power of the plurality of energy storage units; the power allocation of the plurality of energy storage units according to a third voltage ratio includes: allocating power of the plurality of energy storage units according to the total charge / discharge power and the third voltage ratio; and / or the power allocation of the plurality of energy storage units according to a third SOC ratio includes: allocating power of the plurality of energy storage units according to the total charge / discharge power and the third SOC ratio.

[0034] In addition to the third voltage ratio and / or the third SOC ratio, this technical solution also allocates power based on the total charging and discharging power, that is, it allocates power to multiple energy storage units based on more parameters, thus further improving the accuracy of power allocation.

[0035] Secondly, a power distribution device is provided for use in an energy storage system, the energy storage system including multiple energy storage units, comprising: a processing unit for acquiring state parameters and charge / discharge states of the multiple energy storage units, the state parameters including voltage values ​​and / or SOC values; and a distribution unit for distributing power to the multiple energy storage units according to the state parameters and charge / discharge states when a first voltage difference between a first voltage value and a second voltage value is greater than or equal to a preset voltage value, and / or a first SOC difference between a first SOC value and a second SOC value is greater than or equal to a preset SOC value, wherein the first voltage value and the second voltage value are two voltage values ​​among the voltage values, and the first SOC value and the second SOC value are two SOC values ​​among the SOC values.

[0036] Thirdly, a power distribution apparatus is provided, comprising a processor and a memory, the memory for storing a computer program, and the processor for invoking the computer program to execute the methods described in the first aspect or its various implementations. Attached Figure Description

[0037] Figure 1 A schematic diagram of an energy storage architecture according to an embodiment of this application is shown.

[0038] Figure 2 A schematic diagram of the connections between different levels of an energy storage system according to an embodiment of this application is shown.

[0039] Figure 3 A schematic flowchart of a power allocation method according to an embodiment of this application is shown.

[0040] Figure 4 A schematic diagram showing the SOC value and average power distribution of the energy storage unit according to an embodiment of this application is provided.

[0041] Figure 5 A schematic diagram illustrating a power distribution method for an energy storage unit according to an embodiment of this application is shown.

[0042] Figure 6 This illustration shows another schematic flowchart of power distribution for an energy storage unit according to an embodiment of the present application.

[0043] Figure 7 A schematic block diagram of a power distribution apparatus according to an embodiment of this application is shown.

[0044] Figure 8 A schematic block diagram of another power distribution apparatus according to an embodiment of this application is shown. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0046] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the specification of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings of this application are used to distinguish different objects, rather than to describe a specific order or hierarchy.

[0047] The directional terms used in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of this application. It should also be noted in the description of this application that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0048] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0049] In this application, "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more (including two), and "multiple pieces" refers to two or more (including two).

[0050] With the widespread application of new energy sources such as solar and wind power, energy storage technology has developed accordingly. An energy storage system is a device or system capable of storing energy and releasing it when needed. In the field of new energy, energy storage systems typically refer to devices that can store electrical energy and release it during peak electricity demand periods. Energy storage systems play multiple roles in the power system, including load balancing, frequency regulation, backup power, peak-valley pricing management, and improving grid stability. With the rapid development of renewable energy, the importance of energy storage systems is increasing daily.

[0051] Electrochemical energy storage, represented by lithium-ion batteries, is the most prevalent energy storage technology. An electrochemical energy storage system consists of battery devices, a battery management system (BMS), an energy management system (EMS), a power generation system (PCS), and auxiliary equipment.

[0052] In an energy storage system, the battery unit is the energy storage medium, responsible for storing and releasing electrical energy. The Battery Management System (BMS) monitors and manages the battery unit's status, including state of charge, voltage, temperature, and current, to ensure safe operation and prevent over-discharge, overheating, and short circuits, thereby extending battery life. The Energy Management System (EMS) is the control center, responsible for monitoring the entire system's operation and optimizing energy storage and release strategies to meet grid demands or user-defined goals. The Power Control System (PCS) primarily controls the conversion and flow of electrical energy within the system, converting direct current (DC) to alternating current (AC) to meet grid or load requirements. Simultaneously, the PCS can also convert AC to DC to charge the battery units.

[0053] Figure 1 A schematic diagram of an energy storage architecture is shown. Figure 1 In the middle, from top to bottom, the BMS collects, gathers, and calculates battery information from the battery devices. The local BMS collects battery information from multiple BMSs and transmits this information to the data network switch via Controller Area Network (CAN) and Transmission Control Protocol / Internet Protocol (TCP / IP). The PCS works with the battery devices for power conversion. The PCS can transmit its charging and discharging capabilities to the data network switch or control network switch via TCP / IP. The coordination controller, also known as the EMS, is configured according to the scale of the power station. The energy management server controls the energy scheduling of the entire station from the top level.

[0054] During the charging and discharging process of energy storage systems, power allocation is a core management strategy to ensure the efficient, safe, and long-life operation of the system. By allocating power among multiple energy storage units, the overall efficiency of the energy storage system can be improved, the lifespan of the energy storage units can be extended, the safety performance of the energy storage system can be enhanced, and the system can adapt to complex application scenarios. However, there is currently a problem of ineffective power allocation among energy storage units.

[0055] In view of this, this application proposes a power allocation method for an energy storage system. When a first voltage difference is greater than or equal to a preset voltage value and / or a first SOC difference is greater than or equal to a preset SOC value, power is allocated to multiple energy storage units based on their charge / discharge states and their voltage and / or SOC values. Here, the first voltage difference is the difference between a first voltage value and a second voltage value, the first SOC difference is the difference between a first SOC value and a second SOC value, the first voltage value and the second voltage value are two voltage values ​​among the voltage values ​​of the multiple energy storage units, and the first SOC value and the second SOC value are two SOC values ​​among the SOC values ​​of the multiple energy storage units. When the difference between two voltage values ​​of multiple energy storage units is greater than the preset voltage value, and / or the difference between two SOC values ​​of multiple energy storage units is greater than the preset SOC value, it indicates that at least two energy storage units have a significant difference in their SOC and / or voltage values, indicating a need for power allocation. Therefore, this embodiment of the application only allocates power to energy storage units when power allocation to multiple energy storage units is required, reducing the possibility of ineffective power allocation and improving the efficiency of power allocation. Furthermore, since the charging and discharging states of energy storage units differ, the power allocated to each unit may vary. For example, if an energy storage unit is charging and its voltage is high, it may receive less power; conversely, if it is discharging and its voltage is high, it may receive more power. Therefore, this technical solution allocates power to multiple energy storage units based on their charging and discharging states, effectively improving the accuracy of power allocation and thus effectively increasing the charging and discharging capacity of the energy storage units, reducing the bottleneck effect. In addition, since there is a close relationship between voltage and SOC values ​​and power, allocating power to multiple energy storage units based on voltage and / or SOC values ​​can further improve the accuracy of power allocation.

[0056] Figure 2This diagram illustrates the interconnections of various levels in an energy storage system according to an embodiment of this application. Multiple battery cells form an energy storage cabinet, and a Battery Management System (BMS1) collects and calculates the battery information from the energy storage cabinet. Multiple energy storage cabinets can be connected in parallel to form an energy storage container. Multiple energy storage containers (e.g., 2-8) can be connected in parallel, and a single PCS (Power Control System) can control the energy scheduling of these multiple energy storage containers. A central BMS or local BMS can collect battery information from multiple energy storage cabinets and energy storage containers.

[0057] If the embodiments of this application are applied to the BMS master control, local BMS, PCS, energy control unit, PCS master control, or energy control unit master control, power distribution can be achieved at the energy storage cabinet level and energy storage container level. If the embodiments of this application are applied to the coordinating controller slave, coordinating controller master, EMS, or energy management server, power distribution can be achieved between different areas of a single power plant. If the embodiments of this application are running on a dispatch center, power distribution can be achieved between various power plants.

[0058] Figure 3 A schematic flowchart of a power distribution method 300 for an energy storage system according to an embodiment of this application is shown. Exemplarily, method 300 can be applied during charging and discharging processes, where power distribution involves allocating charging power or discharging power. Method 300 may include at least some of the following.

[0059] S310: Obtain the status parameters and charge / discharge status of multiple energy storage units. The status parameters include voltage values ​​and / or SOC values.

[0060] S320: When the first voltage difference between the first voltage value and the second voltage value is greater than or equal to the preset voltage value, and / or the first SOC difference between the first SOC value and the second SOC value is greater than or equal to the preset SOC value, power is allocated to multiple energy storage units according to the charging and discharging states and state parameters of multiple energy storage units.

[0061] Wherein, the first voltage value and the second voltage value are two voltage values ​​among the voltage values, and the first SOC value and the second SOC value are two SOC values ​​among the SOC values.

[0062] When the difference between two voltage values ​​of multiple energy storage units exceeds a preset voltage value, and / or the difference between two SOC values ​​of multiple energy storage units exceeds a preset SOC value, it indicates that at least two energy storage units have significant differences in their SOC and / or voltage values, necessitating power allocation. Therefore, this embodiment of the application performs power allocation only when power allocation among multiple energy storage units is required, reducing the possibility of ineffective power allocation and improving the efficiency of power allocation.

[0063] Furthermore, the power allocated to an energy storage unit may differ depending on its charge / discharge state. For example, if an energy storage unit is charging and has a high voltage, it may receive less power; conversely, if it is discharging and has a high voltage, it may receive more power. Therefore, this technical solution, by allocating power to multiple energy storage units based on their charge / discharge state, can effectively improve the accuracy of power allocation, thereby increasing the charge / discharge capacity of the energy storage units and reducing the bottleneck effect. In addition, since there is a close relationship between voltage and SOC values ​​and power, allocating power to multiple energy storage units based on voltage and / or SOC values ​​can improve the accuracy of power allocation.

[0064] Energy storage units can be, for example, energy storage cabinets, energy storage containers, PCS, power plants, etc.

[0065] Optionally, if the first voltage difference is greater than or equal to a preset voltage value, power can be allocated among the multiple energy storage units based on their voltage values. If the first SOC difference is greater than or equal to a preset value, power can be allocated among the multiple energy storage units based on their SOC values. Alternatively, if the first voltage difference is greater than or equal to a preset voltage value, power can be allocated among the multiple energy storage units first based on their voltage values. After allocation, if the first SOC difference is greater than or equal to the preset value, power can be further allocated among the multiple energy storage units based on their SOC values. Or, if the first SOC difference is greater than or equal to a preset value, power can be allocated among the multiple energy storage units first based on their SOC values. After allocation, if the first voltage difference is greater than or equal to the preset voltage value, power can be further allocated among the multiple energy storage units based on their voltage values.

[0066] For example, since multiple energy storage cabinets connected in parallel can form an energy storage container, and each cabinet has the same voltage, if the first State of Charge (SOC) difference among the multiple energy storage cabinets is greater than or equal to a preset value, power can be allocated to the cabinets based on their SOC values. Then, it is determined whether the first voltage value of the multiple energy storage containers is greater than or equal to a preset voltage value. If it is, power can be allocated to the multiple energy storage containers based on their voltage values.

[0067] The range of preset voltage values ​​can vary depending on the energy storage unit. For example, if the energy storage unit is an energy storage cabinet, the range of preset voltage values ​​can be between 1 volt (V) and 500V. For example, preset voltage values ​​can be 10V, 50V, 100V, 200V, 300V, or 400V, etc.

[0068] Furthermore, even if the energy storage units are the same, the preset voltage value can be different. For example, the preset voltage value can vary depending on some parameters, such as the capacity of the energy storage unit, the state of health (SOH) of the energy storage unit, and the external environment.

[0069] The range of the preset SOC value can also vary depending on the type of energy storage unit. For example, if the energy storage unit is an energy storage cabinet, the preset SOC value can range from 0.1% to 100%. For example, the preset SOC value can be 0.5%, 1%, 10%, 20%, 40%, 50%, 60%, 70%, 80%, or 90%, etc.

[0070] Of course, even if the energy storage units are the same, the preset SOC value can be different. For example, the preset SOC value can vary depending on some parameters, such as the capacity of the energy storage unit, the SOH of the energy storage unit, and the external environment (such as ambient temperature and humidity).

[0071] The first voltage value and the second voltage value can be any two voltage values ​​from multiple energy storage units.

[0072] Alternatively, the first voltage value and the second voltage value can be the voltage values ​​of two fixed energy storage units among multiple energy storage units. For example, the first voltage value can be the voltage value of the first energy storage unit among multiple energy storage units, and the second voltage value can be the voltage value of the second energy storage unit among multiple energy storage units. As another example, the first voltage value and the second voltage value can be the voltage values ​​of the two energy storage units with the lowest temperatures among multiple energy storage units.

[0073] Alternatively, the first voltage value can be the maximum value among multiple voltage values, and the second voltage value can be the minimum value among multiple voltage values. By setting the first voltage value and the second voltage value to the maximum and minimum values ​​among multiple voltage values, respectively, when the first voltage difference is greater than or equal to the preset voltage value, it can more effectively indicate that the voltage difference between multiple energy storage units is large and power allocation is required, further reducing the possibility of ineffective power allocation among multiple energy storage units.

[0074] Similar to the voltage value, the first SOC value and the second SOC value can be any two SOC values ​​from multiple energy storage units.

[0075] Alternatively, the first SOC value and the second SOC value can be the SOC values ​​of two fixed energy storage units among multiple energy storage units. For example, the first SOC value can be the SOC value of the first energy storage unit among multiple energy storage units, and the second SOC value can be the SOC value of the second energy storage unit among multiple energy storage units. As another example, the first SOC value and the second SOC value can be the SOC values ​​of the two energy storage units with the lowest temperatures among multiple energy storage units.

[0076] Alternatively, the first SOC value can be the maximum among multiple SOC values, and the second SOC value can be the minimum among multiple SOC values. Setting the first and second SOC values ​​to the maximum and minimum among multiple SOC values ​​respectively allows for a more favorable indication that a large SOC difference exists between multiple energy storage units when the first SOC difference is greater than or equal to the preset SOC value, necessitating power allocation and further reducing the possibility of ineffective power allocation among multiple energy storage units. The specific implementation method for power allocation among multiple energy storage units based on their voltage and / or SOC values ​​will be described in detail below.

[0077] Method 1

[0078] In some embodiments, method 300 may further include: obtaining at least one of the average power distribution of a plurality of energy storage units, the power limit value of each of the plurality of energy storage units, and the power limit value of the PCS. In this case, the power distribution of the plurality of energy storage units may be performed based on at least one of the average power distribution, the power limit value of each energy storage unit, and the power limit value of the PCS, and based on the charge / discharge state and state parameters.

[0079] This technical solution allocates power to multiple energy storage units based on at least one of the average power distribution, the power limit value of each energy storage unit, and the power limit value of the PCS, and based on the charging / discharging state and state parameters. That is, it allocates power to multiple energy storage units based on more parameters, which can further improve the accuracy of power allocation and make the power allocated to each energy storage unit consistent with the specific situation of each energy storage unit.

[0080] In addition, during the power allocation process for multiple energy storage units, the power limit of the energy storage unit and the power limit of the PCS are taken into account. That is, the allowable charging and discharging power of the energy storage unit and the charging and discharging power of the PCS are taken into account. In this way, the power allocated to each energy storage unit can meet its own capacity requirements, so that the energy storage unit and the energy storage system can operate normally.

[0081] The average power distribution can be determined based on the number of energy storage units and the total charging and discharging power.

[0082] As an example, power can be allocated among multiple energy storage units based on average power distribution, state of charge / discharge, and state parameters.

[0083] For example, if multiple energy storage units are in a charging state, the power allocated to the first energy storage unit is the sum of the average power and a first preset power value, and the power allocated to the second energy storage unit is the difference between the average power and the first preset power value. Here, the first energy storage unit is the one with the smaller voltage and / or smaller SOC value among the multiple energy storage units, and the second energy storage unit is the one with the larger voltage and / or larger SOC value among the multiple energy storage units.

[0084] For example, if multiple energy storage units are in a discharging state, the power allocated to the first energy storage unit is the difference between the average power and the second preset power value, and the power allocated to the second energy storage unit is the sum of the average power and the second preset power value.

[0085] In this context, energy storage units with lower voltage or lower SOC values ​​can be understood as at least some energy storage units whose voltage or SOC value is lower than the average voltage or average SOC value, such as the energy storage unit with the lowest voltage or lowest SOC value. Conversely, energy storage units with higher voltage or higher SOC values ​​can be understood as at least some energy storage units whose voltage or SOC value is higher than the average voltage or average SOC value, such as the energy storage unit with the highest voltage or highest SOC value.

[0086] The first power preset value and the second power preset value can be the same or different.

[0087] If method 300 is applied to the energy storage cabinet level, the first preset power value can range from 0.1 watts (W) to 1 megawatt (MW), and the second preset power value can range from 0.1W to 1MW. For example, the first preset power value can be 1W, 10W, 50W, 100W, 200W, 500W, 1 kilowatt (KW), 10KW, 50KW, 100KW, 300KW, 600KW, or 900KW, etc. The second preset power value can be 1W, 10W, 50W, 100W, 200W, 500W, 1KW, 10KW, 50KW, 100KW, 300KW, 600KW, or 900KW, etc.

[0088] If method 300 is applied to the energy storage container level, the range of the first preset power value can be within 0.1MW-100MW, and the range of the second preset power value can also be within 0.1MW-100MW. For example, the first preset power value can be 0.5MW, 1MW, 5MW, 10MW, 30MW, 50MW, 60MW, 80MW, or 90MW, etc., and the second preset power value can be 0.5MW, 1MW, 5MW, 10MW, 30MW, 50MW, 60MW, 80MW, or 90MW, etc.

[0089] If power is allocated within the power plant area, the first preset power value can range from 0.1MW to 100GW, and the second preset power value can also range from 0.1MW to 100GW. For example, the first preset power value can be 1MW, 10MW, 50MW, 100MW, 300MW, 500MW, 800MW, 1GW, 20GW, 50GW, 60GW, or 90GW, and the second preset power value can be 1MW, 10MW, 50MW, 100MW, 300MW, 500MW, 800MW, 1GW, 20GW, 50GW, 60GW, or 90GW, etc.

[0090] If power is allocated between power plants, the range of the first preset power value can be 0.1MW-10000GW, and the range of the second preset power value can be 0.1MW-10000GW. For example, the first power preset value can be 1MW, 10MW, 50MW, 100MW, 300MW, 500MW, 800MW, 1GW, 20GW, 50GW, 60GW, 90GW, 100GW, 500GW, 1000GW, 2000GW, 5000GW, 7000GW, or 9000GW, etc., and the second power preset value can be 1MW, 10MW, 50MW, 100MW, 300MW, 500MW, 800MW, 1GW, 20GW, 50GW, 60GW, 90GW, 100GW, 500GW, 1000GW, 2000GW, 5000GW, 7000GW, or 9000GW, etc.

[0091] Besides the first and second energy storage units, the power allocated to the other energy storage units among the multiple energy storage units can be either the average power allocation or other types of power.

[0092] like Figure 4As shown, the energy storage unit comprises five energy storage cabinets with SOC values ​​of 80%, 40%, 30%, 20%, and 10% respectively, and an average SOC of 36%. If a total charging and discharging power of 100 kilowatts (kW) is issued from the backend, the average power allocated to the five energy storage cabinets is 20 kW. This average power can be initially distributed evenly among the five energy storage cabinets, such as... Figure 4 As shown, each energy storage cabinet can be allocated 20KW of power.

[0093] Subsequently, to facilitate increasing or decreasing the power of the energy storage cabinets, the five energy storage cabinets can be divided into high SOC and low SOC zones based on the average and median SOC (2.5), such as... Figure 4 As shown, the high SOC region includes energy storage cabinets corresponding to 80% SOC and 40% SOC, and the low SOC region includes energy storage cabinets corresponding to 20% SOC and 10% SOC. Therefore, the first energy storage unit is the energy storage cabinet corresponding to 20% SOC and 10% SOC, and the second energy storage unit is the energy storage cabinet corresponding to 80% SOC and 40% SOC.

[0094] Assuming both the first and second preset power values ​​are 10kW, and the five energy storage cabinets are in a discharging state, the power allocated to the cabinets corresponding to 80% SOC and 40% SOC is the sum of 20kW and 10kW, respectively, which is 30kW. The power allocated to the cabinets corresponding to 20% SOC and 10% SOC is the difference between 20kW and 10kW, respectively, which is 10kW. The power allocated to the cabinet corresponding to 30% SOC is the average allocated power, which is 20kW. The final power allocated to the five energy storage cabinets is as follows: Figure 5 As shown.

[0095] As another example, power can be allocated to multiple energy storage units based on the average power distribution, the power limit of each energy storage unit, the power limit of the PCS, and the state of charge / discharge and the state parameters of multiple energy storage units.

[0096] When multiple energy storage units are in a charging state, the power allocated to the first energy storage unit can be the minimum of the following: the sum of the average allocated power and the first power preset value, the power limit value of the first energy storage unit, and the power limit value of the PCS.

[0097] The power allocated to the second energy storage unit is the minimum of the following: the average allocated power, the difference between the first power and the preset value of the first power, the power limit value of the first energy storage unit, and the power limit value of the PCS.

[0098] During charging, the lower the SOC or voltage value of the energy storage unit, the more power it requires; conversely, the higher the SOC or voltage value, the less power it requires. Therefore, this technical solution uses the sum of the average allocated power and the first preset power value as elements in the set for the first energy storage unit, and the difference between the average allocated power and the first preset power value as elements for the second energy storage unit. This satisfies the actual needs of both the first and second energy storage units during charging. Furthermore, by taking the minimum value among the three elements, the power allocated to each energy storage unit meets its own capacity requirements, ensuring the normal operation of both the energy storage unit and the energy storage system.

[0099] When multiple energy storage units are in a discharging state, the power allocated to the first energy storage unit is the minimum of the following powers: the difference between the average allocated power and the second preset power value, the power limit value of the first energy storage unit, and the power limit value of the PCS.

[0100] The power allocated to the second energy storage unit is the minimum of the following: the sum of the average allocated power and the second preset power, the power limit of the first energy storage unit, and the power limit of the PCS.

[0101] During discharge, the lower the SOC or voltage value of the energy storage unit, the less power it requires; conversely, the higher the SOC or voltage value, the more power it requires. Therefore, this technical solution uses the difference between the average allocated power and the first preset power value as an element in the set for the first energy storage unit, and the sum of the average allocated power and the first preset power value as an element for the second energy storage unit. This satisfies the actual needs of both the first and second energy storage units during discharge. Furthermore, by taking the minimum value among the three elements, the power allocated to each energy storage unit meets its own capacity requirements, ensuring the normal operation of both the energy storage unit and the energy storage system.

[0102] It should be noted that if the difference between the average power distribution and the first preset power value is less than 0, then the difference between the average power distribution and the first preset power value can be 0. Similarly, if the difference between the average power distribution and the second preset power value is less than 0, then the difference between the average power distribution and the second preset power value can be 0.

[0103] Energy storage units may malfunction during operation, such as component failure, low voltage, or high temperature. Therefore, method 300 may further include: fault diagnosis of the energy storage units. If an energy storage unit malfunctions, power allocation to that unit will not be performed.

[0104] Among them, fault diagnosis of energy storage units can be performed randomly, or fault diagnosis of energy storage units can be performed in real time.

[0105] Figure 6 A flowchart illustrating a specific power allocation method according to an embodiment of this application is shown. Figure 6 In this example, both the first and second preset power values ​​are 10KW.

[0106] In section 601, fault diagnosis is performed on multiple energy storage units.

[0107] If none of the multiple energy storage units have failed, then execute 602.

[0108] In 602, the voltage values ​​of multiple energy storage units are obtained.

[0109] In 603, it is determined whether the first voltage difference ΔV is greater than or equal to the preset voltage value.

[0110] The first voltage difference is the difference between the maximum and minimum values ​​among multiple voltage values. If ΔV is greater than or equal to the preset voltage value, then process 604 is executed; if ΔV is less than the preset voltage value, then the process ends and no power allocation is performed.

[0111] In 604, the average power distribution of multiple energy storage units, the power limit value for each energy storage unit, and the power limit value for the PCS are determined.

[0112] In 605, it determines whether multiple energy storage units are in a charging or discharging state.

[0113] If multiple energy storage units are in a charging state, execute 606; if multiple energy storage units are in a discharging state, execute 607.

[0114] In 606, the power allocated to the first energy storage unit is the minimum of the following: the sum of the average allocated power and 10KW, the power limit of the first energy storage unit and the power limit of the PCS; the power allocated to the second energy storage unit is the minimum of the following: the difference between the average allocated power and 10KW, the power limit of the second energy storage unit and the power limit of the PCS.

[0115] Wherein, the Vmin cluster represents the first energy storage unit, and the Vmax cluster represents the second energy storage unit.

[0116] In 607, the power allocated to the first energy storage unit is the minimum of the following: the difference between the average allocated power and 10KW, the power limit of the first energy storage unit and the power limit of the PCS; the power allocated to the second energy storage unit is the minimum of the following: the sum of the average allocated power and 10KW, the power limit of the second energy storage unit and the power limit of the PCS.

[0117] Method 2

[0118] In some embodiments, a second voltage difference and / or a second SOC difference can be determined, and power can be allocated to multiple energy storage units based on the charge / discharge state and the second voltage difference and / or the second SOC difference.

[0119] The second voltage difference is the difference between the voltage value of each energy storage unit and the average voltage value among the multiple energy storage units, and the average voltage value is the average voltage value of the multiple energy storage units. The second SOC difference is the difference between the SOC value of each energy storage unit and the average SOC value among the multiple energy storage units, and the average SOC value is the average SOC value of the multiple energy storage units.

[0120] Since the magnitude of the second voltage difference and the second SOC difference are closely related to the power that the energy storage unit can be allocated, this technical solution can improve the accuracy of power allocation by allocating power to multiple energy storage units based on the second voltage difference and / or the second SOC difference.

[0121] Optionally, the second voltage difference can be determined automatically based on the voltage value of each energy storage unit and the average voltage. Alternatively, the second voltage difference can be obtained by receiving the second voltage difference sent by other modules.

[0122] Similarly, the second SOC difference can be determined automatically based on the SOC value of each energy storage unit and the average SOC value. Alternatively, the second SOC difference can be obtained by receiving the second SOC difference sent by other modules.

[0123] The average voltage can be determined based on the number of energy storage units and the voltage value of each energy storage unit. For example, if the voltage values ​​of 5 energy storage units are 1450V, 1400V, 1350V, 1300V and 1250V respectively, then the average voltage is (1450+1400+1350+1300+1250) / 5=1350V.

[0124] Similarly, the average SOC can be determined based on the number of energy storage units and the SOC value of each unit. For example, if the SOCs of 5 energy storage units are 80%, 40%, 30%, 20%, and 10%, then the average SOC is (80% + 40% + 30% + 20% + 10%) / 5 = 36%.

[0125] Optionally, power can be allocated among multiple energy storage units based on the proportion of the second voltage difference and / or the proportion of the second SOC difference, as well as based on the state of charge and discharge.

[0126] As an example, regarding the proportion of the second voltage difference, power can be allocated among multiple energy storage units based on the state of charge / discharge and the first voltage proportion. Here, the first voltage proportion is the ratio between the second voltage difference and the average voltage.

[0127] In addition to the second voltage difference and the charging / discharging state, this technical solution also allocates power to multiple energy storage units based on the average voltage value. That is, it allocates power to energy storage units based on more parameters, which can further improve the accuracy of power allocation.

[0128] For example, if the voltage of a certain energy storage unit is 1450V and the average voltage is 1340V, then the second voltage difference is 1450-1350=100V, and the first voltage ratio is 100V / 1350V=0.074.

[0129] Furthermore, method 300 may also include: determining the average power distribution of the plurality of energy storage units, and distributing the power of the plurality of energy storage units according to the state of charge / discharge, a first voltage ratio, and the average power distribution.

[0130] This technical solution, in addition to the first voltage ratio and charge / discharge state, also allocates power to multiple energy storage units based on the average power distribution. That is, it further allocates power to the energy storage units based on more parameters, ensuring that the power allocated to each energy storage unit matches its actual situation, thereby improving the accuracy of power allocation and the performance of the energy storage system. Furthermore, since the first voltage ratio is the ratio between the second voltage difference and the average voltage, and the average voltage corresponds to the average power distribution, this technical solution also allocates power to multiple energy storage units based on the average power distribution, making the power allocated to each energy storage unit more accurate.

[0131] If multiple energy storage units are in a discharging state, the power P allocated to each energy storage unit can optionally satisfy the following formula:

[0132] P=[(V-Va)*Pa] / Va+ Pa (1)

[0133] Where V is the voltage value of the energy storage unit, Va is the average voltage, Pa is the average power distribution, the difference between V and Va is the second voltage difference, and (V-Va) / Va is the first voltage ratio.

[0134] For example, if 5 energy storage units are in a discharging state and their voltage values ​​are 1450V, 1400V, 1350V, 1300V and 1250V respectively, and the total charging and discharging power is 1000KW, then the average power distribution is 1000KW / 5 = 200KW, and the average voltage is 1350V.

[0135] The power allocated to the first energy storage unit is P = [(1450-1350)*200] / 1350+200 = 214.8KW, the power allocated to the second energy storage unit is P = [(1400-1350)*200] / 1350+200 = 207.4KW, the power allocated to the third energy storage unit is P = [(1350-1350)*200] / 1350+200 = 200KW, the power allocated to the fourth energy storage unit is P = [(1300-1350)*200] / 1350+200 = 192.6KW, and the power allocated to the fifth energy storage unit is P = [(1250-1350)*200] / 1350+200 = 185.2KW.

[0136] If multiple energy storage units are in a charging state, the power P allocated to each energy storage unit can satisfy the following formula:

[0137] P=|[(Va-V)*(-Pa)] / Va- Pa| (2)

[0138] For example, if five energy storage units are in a charging state with voltage values ​​of 1450V, 1400V, 1350V, 1300V and 1250V respectively, and the total charging and discharging power is 1000KW, then the average power distribution is 1000KW / 5 = 200KW, and the average voltage is 1350V.

[0139] The power allocated to the first energy storage unit is P = |[(1350-1450)*(-200)] / 1350-200| = 185.2 kW, the power allocated to the second energy storage unit is P = |[(1350-1450)*(-200)] / 1350-200| = 192.6 kW, and the power allocated to the third energy storage unit is P = |[(1350-1450)*(-200)] / 1350-200| = 192.6 kW. =200KW, the power allocated to the fourth energy storage unit is P = |[(1350-1300)*(-200)] / 1350-200| = 207.4KW, and the power allocated to the fifth energy storage unit is P = |[(1350-1250)*(-200)] / 1350-200| = 214.8KW.

[0140] As another example, the total voltage value of multiple energy storage units can be determined, and then power can be allocated among the multiple energy storage units according to the state of charge / discharge and a fourth voltage ratio. Here, the fourth voltage ratio is the ratio between the second voltage and the total voltage value.

[0141] At this point, method 300 may further include: determining the total charge / discharge power and average power distribution of multiple energy storage units, and then distributing the power of the multiple energy storage units according to the charge / discharge state, the fourth voltage ratio, the total charge / discharge power and the average power distribution.

[0142] If multiple energy storage units are in a discharging state, the power P allocated to each energy storage unit can optionally satisfy the following formula:

[0143] P=[(V-Va)*Pt] / Vt+ Pa (3)

[0144] Where V is the voltage value of the energy storage unit, Va is the average voltage, Pa is the average power distribution, Pt is the total charging and discharging power, Vt is the total voltage value, the difference between V and Va is the second voltage difference, and (V-Va) / Vt is the fourth voltage ratio.

[0145] For example, if the voltage values ​​of the 5 energy storage units are 1450V, 1400V, 1350V, 1300V and 1250V respectively, and the total charging and discharging power is 1000KW, then the average power distribution is 200KW, the average voltage is 1350V, and the total voltage is 6750V.

[0146] The power allocated to the first energy storage unit is P = [(1450-1350)*1000] / 6750+200 = 214.8KW, the power allocated to the second energy storage unit is P = [(1400-1350)*1000] / 6750+200 = 207.4KW, the power allocated to the third energy storage unit is P = [(1350-1350)*1000] / 6750+200 = 200KW, the power allocated to the fourth energy storage unit is P = [(1300-1350)*1000] / 6750+200 = 192.6KW, and the power allocated to the fifth energy storage unit is P = [(1250-1350)*1000] / 6750+200 = 185.2KW.

[0147] If multiple energy storage units are in a charging state, optionally, the power P allocated to each energy storage unit can satisfy the following formula:

[0148] P=|[(Va-V)*(-Pt)] / Vt-Pa| (4)

[0149] For example, if five energy storage units are charging at voltages of 1450V, 1400V, 1350V, 1300V, and 1250V respectively, and the total charging and discharging power is 1000KW, then the average power distribution is 200KW, the average voltage is 1350V, and the total voltage is 6750V.

[0150] The power allocated to the first energy storage unit is P = |[(1350-1450)*(-1000)] / 6750-200| = 185.2 kW, the power allocated to the second energy storage unit is P = |[(1350-1450)*(-1000)] / 6750-200| = 192.6 kW, and the power allocated to the third energy storage unit is P = |[(1350-1450)*(-1000)] / 6750-200| = 192.6 kW. =200KW, the power allocated to the fourth energy storage unit is P = |[(1350-1300)*(-1000)] / 6750-200| = 207.4KW, and the power allocated to the fifth energy storage unit is P = |[(1350-1450)*(-1000)] / 6750-200| = 214.8KW.

[0151] Regarding the proportion of the second SOC difference, in some embodiments, the total SOC value of multiple energy storage units can be determined, and power can be allocated among the multiple energy storage units based on the state of charge / discharge and the first SOC proportion. The first SOC proportion is the ratio between the second SOC difference and the total SOC value.

[0152] In addition to the second SOC difference and the state of charge / discharge, this technical solution also allocates power to multiple energy storage units based on the total SOC value. That is, it allocates power to energy storage units based on more parameters, which can further improve the accuracy of power allocation.

[0153] For example, if the SOCs of five energy storage units are 80%, 40%, 30%, 20%, and 10%, respectively, then the average SOC is 36%, and the total SOC is 80% + 40% + 30% + 20% + 10% = 180%. The second SOC difference for the energy storage units with an SOC of 80% is 80% - 36% = 44%, and the first SOC ratio is 44% / 180% = 0.244.

[0154] Furthermore, method 300 may also include: determining the average power distribution of the plurality of energy storage units, and distributing the power of the plurality of energy storage units according to the state of charge / discharge, the first SOC ratio and the average power distribution.

[0155] In addition to the first SOC ratio and state of charge / discharge, this technical solution also allocates power to multiple energy storage units based on the average power distribution. That is, it further allocates power to the energy storage units based on more parameters, so that the power allocated to each energy storage unit can match the actual situation of each energy storage unit, thereby further improving the accuracy of power allocation and the performance of the energy storage system.

[0156] If multiple energy storage units are in a discharging state, the power P allocated to each energy storage unit can optionally satisfy the following formula:

[0157] P = [(S-Sa)*Pa] / St + Pa (5)

[0158] Where S is the SOC value of the energy storage unit, Sa is the average SOC value, Pa is the average power distribution, St is the total SOC value, the difference between S and Sa is the second SOC difference, and (S-Sa) / St is the first SOC ratio.

[0159] For example, if five energy storage units are in a discharging state with State of Charge (SOC) of 80%, 40%, 30%, 20%, and 10%, respectively, and the total charging and discharging power is 1000 kW, then the average power distribution is 1000 kW / 5 = 200 kW, the total SOC is 180%, and the average SOC is 36%.

[0160] The power allocated to the first energy storage unit is P = [(80% - 36%) * 200] / 180% + 200 = 249 KW, the power allocated to the second energy storage unit is P = [(40% - 36%) * 200] / 180% + 200 = 204 KW, the power allocated to the third energy storage unit is P = [(30% - 36%) * 200] / 180% + 200 = 193.4 KW, the power allocated to the fourth energy storage unit is P = [(20% - 36%) * 200] / 180% + 200 = 182.2 KW, and the power allocated to the fifth energy storage unit is P = [(10% - 36%) * 200] / 180% + 200 = 171.1 KW.

[0161] If multiple energy storage units are in a charging state, the power P allocated to each energy storage unit can satisfy the following formula:

[0162] P=|[(Sa-S)*(-Pa)] / St-Pa| (6)

[0163] For example, five energy storage units are in a charging state, with SOCs of 80%, 40%, 30%, 20%, and 10%, respectively. The total charging and discharging power is 1000 kW, so the average power distribution is 1000 kW / 5 = 200 kW, the total SOC is 180%, and the average SOC is 36%.

[0164] The power allocated to the first energy storage unit is P = |[(36%-80%)*(-200)] / 180%-200| = 151.1KW, the power allocated to the second energy storage unit is P = |[(36%-40%)*(-200)] / 180%-200| = 195.6KW, the power allocated to the third energy storage unit is P = |[(36%-30%)*(-200)] / 180%-200| = 206.7KW, the power allocated to the fourth energy storage unit is P = |[(36%-20%)*(-200)] / 180%-200| = 217.8KW, and the power allocated to the fifth energy storage unit is P = |[(36%-10%)*(-200)] / 180%-200| = 228.9KW.

[0165] It should be noted that, in the embodiments of this application, after obtaining the power allocation value of each energy storage unit based on the second voltage difference and / or the second SOC difference, the power allocation value can be determined as the final power allocation value of the energy storage unit. Alternatively, the minimum value among the power allocation value, the power limit value of the energy storage unit, and the power limit value of the PCS can be taken and determined as the final power allocation value of the energy storage unit.

[0166] Method 3

[0167] Power can be allocated to each energy storage unit based on the proportion of its voltage value and / or SOC value, as well as the charging and discharging status of multiple energy storage units.

[0168] As an example, when multiple energy storage units are in a discharging state, the total voltage value of the multiple energy storage units can be obtained, and then power can be allocated to each energy storage unit according to a second voltage ratio. The second voltage ratio is the ratio between the voltage value of each energy storage unit and the total voltage value of the multiple energy storage units.

[0169] Since the voltage value of each energy storage unit and the total voltage value of multiple energy storage units are closely related to the power that can be allocated to each energy storage unit, this technical solution can improve the accuracy of power allocation by allocating power to multiple energy storage units according to the ratio between the voltage value of each energy storage unit and the total voltage value when multiple energy storage units are in a discharging state.

[0170] For example, if the voltage values ​​of the five energy storage units are 1450V, 1400V, 1350V, 1300V and 1250V respectively, and the total voltage value is 6750V, then the second voltage ratios corresponding to the five energy storage units are 1450 / 6750, 1400 / 6750, 1350 / 6750, 1300 / 6750 and 1250 / 6750 respectively.

[0171] Furthermore, method 300 may also include: obtaining the total charge and discharge power of multiple energy storage units, and allocating power among the multiple energy storage units according to the ratio of the total charge and discharge power to the second voltage.

[0172] In addition to the second voltage ratio, this technical solution also allocates power based on the total charging and discharging power of multiple energy storage units. That is, it allocates power to multiple energy storage units based on more parameters, which can further improve the accuracy of power allocation.

[0173] Optionally, power can be allocated among multiple energy storage units based on the product of the second voltage ratio and the total charge / discharge power.

[0174] For example, if five energy storage units are in a discharging state with voltages of 1450V, 1400V, 1350V, 1300V, and 1250V respectively, and a total voltage of 6750V, and a total charging / discharging power of 1000KW, then the power allocated to the first energy storage unit is 1450*1000 / 6750 = 214.8KW, the second energy storage unit is 1400*1000 / 6750 = 207.4KW, the third energy storage unit is 1350*1000 / 6750 = 200KW, the fourth energy storage unit is 1300*1000 / 6750 = 192.6KW, and the fifth energy storage unit is 1250*1000 / 6750 = 185.2KW.

[0175] As another example, the total SOC value of multiple energy storage units can be obtained, and then power can be allocated among the multiple energy storage units according to a second SOC ratio. Here, the second SOC ratio is the ratio between the SOC value of each energy storage unit and the total SOC value of the multiple energy storage units.

[0176] Since the SOC value of each energy storage unit and the total SOC value of multiple energy storage units are closely related to the power that can be allocated to each energy storage unit, this technical solution can improve the accuracy of power allocation by allocating power to multiple energy storage units according to the ratio between the SOC value of each energy storage unit and the total SOC value when multiple energy storage units are in a discharging state.

[0177] For example, if the SOCs of the five energy storage units are 80%, 40%, 30%, 20%, and 10%, respectively, and the total SOC is 180%, then the second SOC ratios of the five energy storage units are 80% / 180%, 40% / 180%, 30% / 180%, 20% / 180%, and 10% / 180%, respectively.

[0178] Furthermore, method 300 may also include: obtaining the total charge and discharge power of multiple energy storage units, and allocating power to the multiple energy storage units according to the total charge and discharge power and the second SOC ratio.

[0179] In addition to the second SOC ratio, this technical solution also allocates power based on the total charging and discharging power of multiple energy storage units. That is, it allocates power to multiple energy storage units based on more parameters, which can further improve the accuracy of power allocation.

[0180] Optionally, power can be allocated among multiple energy storage units based on the product of the second SOC ratio and the total charge / discharge power.

[0181] For example, if five energy storage units are in a discharging state with SOCs of 80%, 40%, 30%, 20%, and 10% respectively, and the total SOC is 180%, and the total charging and discharging power is 1000 kW, then the power allocated to the first energy storage unit is 80 * 1000 / 180 = 444.4 kW, the power allocated to the second energy storage unit is 40 * 1000 / 180 = 222.2 kW, the power allocated to the third energy storage unit is 30 * 1000 / 180 = 166.7 kW, the power allocated to the fourth energy storage unit is 20 * 1000 / 180 = 111.1 kW, and the power allocated to the fifth energy storage unit is 10 * 1000 / 180 = 55.6 kW.

[0182] In other embodiments, when multiple energy storage units are in a charging state, power can be allocated among the multiple energy storage units according to a third voltage ratio. The third voltage ratio is the ratio between a third voltage value and a fourth voltage value; the third voltage value is the difference between the voltage value of each energy storage unit and its full-charge voltage; and the fourth voltage value is the sum of the multiple third voltage values.

[0183] Since the third voltage ratio is closely related to the power that can be allocated to each energy storage unit during the charging state, this technical solution can improve the accuracy of power allocation by allocating power to multiple energy storage units according to the third voltage ratio when multiple energy storage units are in the charging state.

[0184] The full-charge voltage can be understood as the specified upper limit voltage value. Optionally, the full-charge voltage value can vary depending on the energy storage unit. For example, if the energy storage unit is an energy storage cabinet, the full-charge voltage value can be 1500V or other values.

[0185] For example, if five energy storage units are in a charging state with voltage values ​​of 1450V, 1400V, 1350V, 1300V and 1250V respectively, and assuming the full charge voltage is 1500V, then the third voltage values ​​are -50V, -100V, -150V, -200V and -250V respectively, and the fourth voltage value is (-50V-100V-150V-200V-250V) = -750V.

[0186] Furthermore, method 300 may also include: obtaining the total charge and discharge power of multiple energy storage units, and allocating power among the multiple energy storage units according to the total charge and discharge power and the third voltage ratio.

[0187] In addition to the third voltage ratio, this technical solution also allocates power based on the total charging and discharging power, that is, it allocates power to multiple energy storage units based on more parameters, thus further improving the accuracy of power allocation.

[0188] Optionally, power can be allocated among multiple energy storage units based on the product of the third voltage ratio and the total charge / discharge power.

[0189] In other words, the power P allocated to each energy storage unit can satisfy the following formula:

[0190] P=|Vs*(-Pt) / Vd| (7)

[0191] Where Vs is the third voltage value, Vd is the fourth voltage value, and Pt is the total charging and discharging power.

[0192] For example, five energy storage units are in a charging state with voltage values ​​of 1450V, 1400V, 1350V, 1300V and 1250V respectively, a full charge voltage of 1500V, a total charging and discharging power of 1000KW, third voltage values ​​of -50V, -100V, -150V, -200V and -250V respectively, and a fourth voltage value of -750V.

[0193] The power that can be allocated to the first energy storage unit is |(-50)*(-1000) / (-750)|=66.7KW, the power that can be allocated to the second energy storage unit is |(-100)*(-1000) / (-750)|=133.3KW, the power that can be allocated to the third energy storage unit is |(-150)*(-1000) / (-750)|=200KW, the power that can be allocated to the fourth energy storage unit is |(-200)*(-1000) / (-750)|=266.7KW, and the power that can be allocated to the fifth energy storage unit is |(-250)*(-1000) / (-750)|=333.3KW.

[0194] In other embodiments, when multiple energy storage units are in a charging state, power can be allocated among the multiple energy storage units according to a third SOC ratio. The third SOC ratio is the ratio between a third SOC value and a fourth SOC value. The third SOC value is the difference between the SOC value of each energy storage unit and its fully charged SOC value, and the fourth SOC value is the sum of the multiple third SOC values.

[0195] Since the third SOC ratio is closely related to the power that can be allocated to each energy storage unit during charging, this technical solution can improve the accuracy of power allocation by allocating power to multiple energy storage units according to the third SOC ratio when multiple energy storage units are charging.

[0196] The full charge SOC value can be understood as the specified upper limit voltage value. For example, the full charge SOC value can be 100%. Of course, the full charge SOC value can also be other values.

[0197] For example, if five energy storage units are in a charging state with SOC values ​​of 80%, 40%, 30%, 20%, and 10%, respectively, and assuming a full charge SOC value of 100%, then the third SOC values ​​are -20%, -60%, -70%, -80%, and -90%, respectively, and the fourth SOC value is (-20% - 60% - 70% - 80% - 90%) = -320%.

[0198] Furthermore, method 300 may also include: obtaining the total charge and discharge power of multiple energy storage units, and allocating power to the multiple energy storage units according to the total charge and discharge power and the third SOC ratio.

[0199] In addition to the third SOC ratio, this technical solution also allocates power based on the total charging and discharging power, that is, it allocates power to multiple energy storage units based on more parameters, thus further improving the accuracy of power allocation.

[0200] Optionally, power can be allocated among multiple energy storage units based on the product of the third SOC ratio and the total charge / discharge power.

[0201] In other words, the power P allocated to each energy storage unit can satisfy the following formula:

[0202] P = |Ss*(-Pt) / Sd| (8)

[0203] Where Ss is the third SOC value, Sd is the fourth SOC value, and Pt is the total charging and discharging power.

[0204] For example, if five energy storage units are in a charging state with SOC values ​​of 80%, 40%, 30%, 20%, and 10%, respectively, and assuming a full charge SOC value of 100%, then the third SOC values ​​are -20%, -60%, -70%, -80%, and -90%, and the fourth SOC value is -320%.

[0205] The power that can be allocated to the first energy storage unit is |(-20%)*(-1000) / (-320%)| = 62.5KW, the power that can be allocated to the second energy storage unit is |(-60%)*(-1000) / (-320%)| = 187.5KW, the power that can be allocated to the third energy storage unit is |(-70%)*(-1000) / (-320%)| = 200KW, the power that can be allocated to the fourth energy storage unit is |(-80%)*(-1000) / (-320%)| = 218.75KW, and the power that can be allocated to the fifth energy storage unit is |(-90%)*(-1000) / (-320%)| = 281.25KW.

[0206] It should be noted that after obtaining the power allocation value of each energy storage unit according to Method 3, the power allocation value can be determined as the final power allocation value of the energy storage unit. Alternatively, the minimum value among the power allocation value, the power limit value of the energy storage unit, and the power limit value of the PCS can be taken and determined as the final power allocation value of the energy storage unit.

[0207] In some embodiments, one of the three methods for power allocation to multiple energy storage units can be randomly selected; or, the power allocation method can be selected according to the application scenario of the energy storage system; or, the power allocation method can be selected according to the type of energy storage unit; or, the power allocation method can be selected according to the purpose of the energy storage unit; or, the power allocation method can be selected according to other state parameters of the energy storage unit, such as the temperature and health status of the energy storage unit; or, the power allocation method can be determined according to the geographical environment of the energy storage unit.

[0208] In the embodiments of this application, the order of the above-mentioned process numbers does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0209] Furthermore, without conflict, the various embodiments and / or technical features described in this application can be arbitrarily combined with each other, and the resulting technical solutions should also fall within the protection scope of this application.

[0210] The power allocation method of the energy storage system according to the embodiments of this application has been described in detail above. The power allocation apparatus according to the embodiments of this application will be described below. It should be understood that the power allocation method of the energy storage system in the embodiments of this application can be applied to the power allocation apparatus according to the embodiments of this application.

[0211] Figure 7 A schematic block diagram of a power distribution apparatus 700 according to an embodiment of this application is shown. This power distribution apparatus 700 can be applied to an energy storage system including multiple energy storage units. Figure 7 As shown, the power distribution device 700 may include:

[0212] The processing unit 710 is used to acquire the state parameters and charge / discharge status of multiple energy storage units, the state parameters including...

[0213] The allocation unit 720 is configured to allocate power to the plurality of energy storage units according to the state parameters of the plurality of energy storage units and the charging and discharging state when the first voltage difference between the first voltage value and the second voltage value is greater than or equal to a preset voltage value, and / or the first SOC difference between the first SOC value and the second SOC value is greater than or equal to a preset SOC value. The first voltage value and the second voltage value are two voltage values ​​among the voltage values, and the first SOC value and the second SOC value are two SOC values ​​among the SOC values.

[0214] Optionally, in this embodiment, the first voltage value is the maximum value among the voltage values, the second voltage value is the minimum value among the voltage values, the first SOC value is the maximum value among the SOC values, and the second SOC value is the minimum value among the SOC values.

[0215] Optionally, in this embodiment of the application, the processing unit 710 is further configured to: obtain at least one of the average power distribution of the plurality of energy storage units, the power limit value of each of the plurality of energy storage units, and the power limit value of the PCS; the allocation unit 720 is specifically configured to allocate power to the plurality of energy storage units according to at least one of the average power distribution, the power limit value of each of the energy storage units, and the power limit value of the PCS, and according to the charge / discharge state and the state parameters.

[0216] Optionally, in this embodiment, when the plurality of energy storage units are in a charging state, the power allocated to the first energy storage unit is the minimum of the following powers: the sum of the average allocated power and the first preset power value, the power limit value of the first energy storage unit, and the power limit value of the PCS, wherein the first energy storage unit is the energy storage unit with the smallest voltage value and / or the smallest SOC value among the plurality of energy storage units; the power allocated to the second energy storage unit is the minimum of the following powers: the difference between the average allocated power and the first preset power value, the power limit value of the first energy storage unit, and the power limit value of the PCS, wherein the second energy storage unit is the energy storage unit with the largest voltage value and / or the largest SOC value among the plurality of energy storage units.

[0217] Optionally, in this embodiment, when the plurality of energy storage units are in a discharging state, the power allocated to the first energy storage unit is the minimum of the following powers: the difference between the average allocated power and the second preset power value, the power limit value of the first energy storage unit, and the power limit value of the PCS, wherein the first energy storage unit is the energy storage unit with the smallest voltage value and / or the smallest SOC value among the plurality of energy storage units; the power allocated to the second energy storage unit is the minimum of the following powers: the sum of the average allocated power and the second preset power value, the power limit value of the first energy storage unit, and the power limit value of the PCS, wherein the second energy storage unit is the energy storage unit with the largest voltage value and / or the largest SOC value among the plurality of energy storage units.

[0218] Optionally, in this embodiment, the processing unit 710 is further configured to: determine a second voltage difference and / or a second SOC difference, wherein the second voltage difference is the difference between the voltage value of each energy storage unit in the plurality of energy storage units and the average voltage value, the average voltage value being the average voltage value of the plurality of energy storage units, and the second SOC difference is the difference between the SOC value of each energy storage unit in the plurality of energy storage units and the average SOC value, the average SOC value being the average SOC value of the plurality of energy storage units; the allocation unit 720 is specifically configured to: allocate power to the plurality of energy storage units according to the charge / discharge state and according to the second voltage difference and / or the second SOC difference.

[0219] Optionally, in this embodiment, the allocation unit 720 is specifically used to: allocate power to the plurality of energy storage units according to the charge / discharge state and the first voltage ratio, wherein the first voltage ratio is the ratio between the second voltage difference and the average voltage.

[0220] Optionally, in this embodiment of the application, the processing unit 710 is further configured to: determine the average power distribution of the plurality of energy storage units; the allocation unit 720 is specifically configured to: allocate power to the plurality of energy storage units according to the charge / discharge state, the first voltage ratio and the average power distribution.

[0221] Optionally, in this embodiment of the application, the processing unit 710 is further configured to: determine the total SOC value of the plurality of energy storage units; the allocation unit 720 is specifically configured to: allocate power to the plurality of energy storage units according to the charge / discharge state and the first SOC ratio, wherein the first SOC ratio is the ratio between the second SOC difference and the total SOC value.

[0222] Optionally, in this embodiment, the processing unit 710 is further configured to: determine the average power distribution of the plurality of energy storage units; the allocation unit 720 is specifically configured to: allocate power to the plurality of energy storage units according to the charge / discharge state, the first SOC ratio and the average power distribution.

[0223] Optionally, in this embodiment, the allocation unit 720 is specifically configured to: when the plurality of energy storage units are in a discharging state, allocate power to the plurality of energy storage units according to a second voltage ratio, wherein the second voltage ratio is the ratio between the voltage value of each energy storage unit and the total voltage value of the plurality of energy storage units; and / or, allocate power to the plurality of energy storage units according to a second SOC ratio, wherein the second SOC ratio is the ratio between the SOC value of each energy storage unit and the total SOC value of the plurality of energy storage units.

[0224] Optionally, in this embodiment, the processing unit 710 is further configured to: obtain the total charge / discharge power of the plurality of energy storage units; the allocation unit 720 is specifically configured to: allocate power to the plurality of energy storage units according to the total charge / discharge power and the second voltage ratio; and / or, allocate power to the plurality of energy storage units according to the total charge / discharge power and the second SOC ratio.

[0225] Optionally, in this embodiment of the application, when the plurality of energy storage units are in a charging state, the allocation unit 720 is specifically used to: allocate power to the plurality of energy storage units according to a third voltage ratio, wherein the third voltage ratio is the ratio between a third voltage value and a fourth voltage value, the third voltage value is the difference between the voltage value of each energy storage unit in the plurality of energy storage units and the full charge voltage value, and the fourth voltage value is the sum of the plurality of the third voltage values; and / or allocate power to the plurality of energy storage units according to a third SOC ratio, wherein the third SOC ratio is the ratio between a third SOC value and a fourth SOC value, the third SOC value is the difference between the SOC value of each energy storage unit in the plurality of energy storage units and the full charge SOC value, and the fourth SOC value is the sum of the plurality of the third SOC values.

[0226] Optionally, in this embodiment, the processing unit 710 is further configured to: obtain the total charge and discharge power of the plurality of energy storage units; the allocation unit 720 is specifically configured to: allocate power to the plurality of energy storage units according to the total charge and discharge power and the third voltage ratio, and / or allocate power to the plurality of energy storage units according to the total charge and discharge power and the third SOC ratio.

[0227] It should be understood that the power distribution device 700 can implement the corresponding operations in the method 300, which will not be described in detail here for the sake of brevity.

[0228] Figure 8 This is a schematic diagram of the hardware structure of a power distribution device 800 according to an embodiment of this application. The power distribution device 800 includes a memory 801, a processor 802, a communication interface 803, and a bus 804. The memory 801, processor 802, and communication interface 803 are interconnected via the bus 804.

[0229] The memory 801 may be a read-only memory (ROM), a static storage device, or a random access memory (RAM). The memory 801 may store a program, and when the program stored in the memory 801 is executed by the processor 802, the processor 802 and the communication interface 803 are used to execute the various steps of the power distribution method of the energy storage system of the present application embodiment.

[0230] The processor 802 may be a general-purpose central processing unit (CPU), microprocessor, application-specific integrated circuit (ASIC), graphics processing unit (GPU), or one or more integrated circuits, used to execute relevant programs to achieve the functions required by the units in the apparatus of this application embodiment, or to execute the power distribution method of the energy storage system of this application embodiment.

[0231] The processor 802 can also be an integrated circuit chip with signal processing capabilities. In implementation, each step of the power distribution method of the energy storage system in this embodiment can be completed by the integrated logic circuitry in the processor 802 or by software instructions.

[0232] The processor 802 described above can also be a general-purpose processor, a digital signal processor (DSP), an ASIC, a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of this application. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the methods disclosed in the embodiments of this application can be directly implemented by the hardware processor, or implemented by a combination of hardware and software modules in the processor. The software modules can be located in random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, or other mature storage media in the art. This storage medium is located in memory 801. The processor 802 reads the information in memory 801 and, in conjunction with its hardware, completes the functions required by the units included in the power distribution apparatus 800 of the embodiments of this application, or executes the power distribution method of the energy storage system of the embodiments of this application.

[0233] The communication interface 803 uses transceiver devices, such as, but not limited to, transceivers, to enable communication between the power distribution device 800 and other devices or communication networks.

[0234] Bus 804 may include a pathway for transmitting information between various components of the power distribution device 800 (e.g., memory 801, processor 802, communication interface 803).

[0235] It should be noted that although the power distribution device 800 described above only shows a memory, processor, and communication interface, those skilled in the art should understand that in specific implementations, the power distribution device 800 may also include other devices necessary for normal operation. Furthermore, depending on specific needs, those skilled in the art should understand that the power distribution device 800 may also include hardware devices for implementing other additional functions. Moreover, those skilled in the art should understand that the power distribution device 800 may only include the devices necessary for implementing the embodiments of this application, and may not necessarily include... Figure 8 All the devices shown.

[0236] This application also provides a computer-readable storage medium for storing a computer program for performing the methods described in the various embodiments of this application.

[0237] The aforementioned computer-readable storage medium may be a transient computer-readable storage medium or a non-transitory computer-readable storage medium.

[0238] This application also provides a computer program product, which includes a computer program stored on a computer-readable storage medium. The computer program includes program instructions that, when executed by a computer, cause the computer to perform the power distribution method of the energy storage system described above.

[0239] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A method for power distribution in an energy storage system, characterized in that, The energy storage system includes multiple energy storage units, and the method includes: Acquire the state parameters and charge / discharge status of the plurality of energy storage units, wherein the state parameters include voltage value and / or SOC value; When the first voltage difference between the first voltage value and the second voltage value is greater than or equal to a preset voltage value, and / or the first SOC difference between the first SOC value and the second SOC value is greater than or equal to a preset SOC value, power is allocated to the plurality of energy storage units according to the state parameters of the plurality of energy storage units and the charge / discharge state, wherein the first voltage value and the second voltage value are two voltage values ​​among the voltage values, and the first SOC value and the second SOC value are two SOC values ​​among the SOC values.

2. The method according to claim 1, characterized in that, The first voltage value is the maximum value among the voltage values, the second voltage value is the minimum value among the voltage values, the first SOC value is the maximum value among the SOC values, and the second SOC value is the minimum value among the SOC values.

3. The method according to claim 1 or 2, characterized in that, The method further includes: Obtain at least one of the following: the average allocated power of the plurality of energy storage units, the power limit value of each of the plurality of energy storage units, and the power limit value of the PCS; The step of allocating power to the plurality of energy storage units based on their state parameters and charge / discharge states includes: The power of the plurality of energy storage units is allocated according to at least one of the average power distribution, the power limit value of each energy storage unit, and the power limit value of the PCS, and according to the charge / discharge state and the state parameters.

4. The method according to claim 3, characterized in that, When the plurality of energy storage units are in a charging state, the power allocated to the first energy storage unit is the minimum of the following powers: the sum of the average allocated power and the first power preset value, the power limit value of the first energy storage unit, and the power limit value of the PCS. The first energy storage unit is the energy storage unit with the smallest voltage value and / or the smallest SOC value among the plurality of energy storage units. The power allocated to the second energy storage unit is the minimum of the following: the difference between the average allocated power and the first preset power value, the power limit value of the first energy storage unit, and the power limit value of the PCS. The second energy storage unit is the energy storage unit with the largest voltage value and / or the largest SOC value among the plurality of energy storage units.

5. The method according to claim 3, characterized in that, When the plurality of energy storage units are in a discharging state, the power allocated to the first energy storage unit is the minimum of the following powers: the difference between the average allocated power and the second preset power value, the power limit value of the first energy storage unit, and the power limit value of the PCS. The first energy storage unit is the energy storage unit with the smallest voltage value and / or the smallest SOC value among the plurality of energy storage units. The power allocated to the second energy storage unit is the minimum of the following: the sum of the average allocated power and the second preset power value, the power limit value of the first energy storage unit, and the power limit value of the PCS. The second energy storage unit is the energy storage unit with the largest voltage value and / or the largest SOC value among the plurality of energy storage units.

6. The method according to claim 1 or 2, characterized in that, The step of allocating power to the plurality of energy storage units based on their state parameters and charge / discharge states includes: A second voltage difference and / or a second SOC difference are determined, wherein the second voltage difference is the difference between the voltage value of each energy storage unit in the plurality of energy storage units and the average voltage value, wherein the average voltage value is the average voltage value of the plurality of energy storage units; and the second SOC difference is the difference between the SOC value of each energy storage unit in the plurality of energy storage units and the average SOC value, wherein the average SOC value is the average SOC value of the plurality of energy storage units. Based on the charge / discharge state, and based on the second voltage difference and / or the second SOC difference, power is allocated to the plurality of energy storage units.

7. The method according to claim 6, characterized in that, The step of allocating power to the plurality of energy storage units based on the charge / discharge state and based on the second voltage difference and / or the second SOC difference includes: Based on the charge / discharge state and the first voltage ratio, power is allocated to the plurality of energy storage units, wherein the first voltage ratio is the ratio between the second voltage difference and the average voltage.

8. The method according to claim 7, characterized in that, The method further includes: Determine the average power distribution of the plurality of energy storage units; The step of allocating power to the plurality of energy storage units based on the charge / discharge state and the first voltage ratio includes: The power is allocated to the plurality of energy storage units based on the charge / discharge state, the first voltage ratio, and the average power distribution.

9. The method according to claim 6 or 7, characterized in that, The method further includes: Determine the total SOC value of the plurality of energy storage units; The step of allocating power to the plurality of energy storage units based on the charge / discharge state and based on the second voltage difference and / or the second SOC difference includes: Based on the state of charge / discharge and the first SOC ratio, power is allocated to the plurality of energy storage units, wherein the first SOC ratio is the ratio between the second SOC difference and the total SOC value.

10. The method according to claim 9, characterized in that, The method further includes: Determine the average power distribution of the plurality of energy storage units; The step of allocating power to the plurality of energy storage units based on the charge / discharge state and the first SOC ratio includes: Power is allocated to the plurality of energy storage units based on the state of charge / discharge, the first SOC ratio, and the average power distribution.

11. The method according to claim 1 or 2, characterized in that, The step of allocating power to the plurality of energy storage units based on their state parameters and charge / discharge states includes: When the plurality of energy storage units are in a discharged state, power is allocated among the plurality of energy storage units according to a second voltage ratio, wherein the second voltage ratio is the ratio between the voltage value of each energy storage unit and the total voltage value of the plurality of energy storage units; and / or Power is allocated to the plurality of energy storage units according to a second SOC ratio, wherein the second SOC ratio is the ratio between the SOC value of each energy storage unit and the total SOC value of the plurality of energy storage units.

12. The method according to claim 11, characterized in that, The method further includes: Obtain the total charge and discharge power of the plurality of energy storage units; The step of allocating power to the plurality of energy storage units according to the second voltage ratio includes: Based on the total charge / discharge power and the second voltage ratio, power is allocated to the plurality of energy storage units; and / or The step of allocating power to the plurality of energy storage units according to the second SOC ratio includes: The power is allocated to the plurality of energy storage units based on the total charge / discharge power and the second SOC ratio.

13. The method according to claim 1 or 2, characterized in that, The step of allocating power to the plurality of energy storage units based on their state parameters and charge / discharge states includes: When the plurality of energy storage units are in a charging state, power is allocated among the plurality of energy storage units according to a third voltage ratio, wherein the third voltage ratio is the ratio between a third voltage value and a fourth voltage value, the third voltage value is the difference between the voltage value of each energy storage unit and the full charge voltage value, and the fourth voltage value is the sum of the plurality of third voltage values; and / or Power is allocated to the plurality of energy storage units according to a third SOC ratio, wherein the third SOC ratio is the ratio between the third SOC value and the fourth SOC value, the third SOC value is the difference between the SOC value of each energy storage unit and the full-charge SOC value, and the fourth SOC value is the sum of the plurality of third SOC values.

14. The method according to claim 13, characterized in that, The method further includes: Obtain the total charge and discharge power of the plurality of energy storage units; The step of allocating power to the plurality of energy storage units according to the third voltage ratio includes: Based on the total charge / discharge power and the third voltage ratio, power is allocated to the plurality of energy storage units; and / or The step of allocating power to the plurality of energy storage units according to the third SOC ratio includes: The power is allocated to the plurality of energy storage units based on the total charge / discharge power and the third SOC ratio.

15. A power distribution device, characterized in that, Applied to an energy storage system, the energy storage system comprising multiple energy storage units, including: A processing unit is used to acquire the status parameters and charge / discharge status of the plurality of energy storage units, wherein the status parameters include voltage value and / or SOC value; The allocation unit is configured to allocate power to the plurality of energy storage units based on the state parameters of the plurality of energy storage units and the charging / discharging state when the first voltage difference between the first voltage value and the second voltage value is greater than or equal to a preset voltage value, and / or the first SOC difference between the first SOC value and the second SOC value is greater than or equal to a preset SOC value. The first voltage value and the second voltage value are two voltage values ​​among the voltage values, and the first SOC value and the second SOC value are two SOC values ​​among the SOC values.

16. A power distribution device, characterized in that, include: Memory, used to store programs; A processor for executing a program stored in the memory, wherein when the program stored in the memory is executed, the processor is configured to perform a power distribution method for an energy storage system according to any one of claims 1 to 14.

Images