Control method for battery circuit in energy storage inverter, and related device therefor

Abstract

The present application relates to a control method for a battery circuit in an energy storage inverter, and a related device therefor. The control method for a battery circuit in an energy storage inverter comprises: in response to the startup of an energy storage inverter, acquiring the total operating power corresponding to a plurality of battery circuits; acquiring battery state information respectively corresponding to the plurality of battery circuits, and on the basis of the battery state information, determining target battery circuits on which a control operation is to be executed, wherein the battery state information comprises the current battery voltage value and battery SOC information; and on the basis of the total operating power and the battery state information corresponding to the target battery circuits, determining allocated powers corresponding to the respective target battery circuits, and controlling the target battery circuits to operate on the basis of the allocated powers.

Description

Control method of battery circuit in energy storage inverter and related equipment

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is based on the Chinese patent application with application number 202410322705.9 and application date of March 20, 2024, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby incorporated into this application by introduction. Technical Field

[0003] The present application relates to the technical field of energy storage inverters, and in particular to a control method for a battery circuit in an energy storage inverter and related equipment. Background Art

[0004] Energy storage inverters connect PV panels, batteries, and the grid. Typically, the PV panels generate electricity to charge the batteries during the day, and the batteries power the loads at night. Alternatively, during a grid outage, the energy storage inverter can operate off-grid to power household loads. As household life improves, the power consumption of household loads increases, requiring larger batteries to meet these demands.

[0005] Since the capacity of a single battery cell typically falls within an industry-default specification range, there are two common approaches to further increasing the battery capacity of energy storage inverters: 1. Batteries are typically connected in series to increase total battery capacity. However, increasing the number of series cells increases the battery port voltage, and energy storage inverters typically have a maximum input voltage limit, limiting the increase in total battery capacity achieved through series connection. 2. Multiple input batteries are connected in parallel to the energy storage inverter. However, due to differences in battery specifications, remaining state of charge (SOC), and battery charge and discharge current limits, achieving energy balancing control and ensuring stable user load operation are difficult.

[0006] The total battery capacity is too small to meet user needs, it is difficult to achieve energy balance control among individual batteries, it is difficult to ensure the stability of user load operation, and the applicable scenarios of energy storage inverters are relatively narrow. Currently, no effective solutions have been proposed for these problems. Summary of the Invention

[0007] In a first aspect, an embodiment of the present application provides a method for controlling a battery circuit in an energy storage inverter, wherein multiple battery circuits are connected in parallel to a DC bus of the energy storage inverter, and the battery circuits include batteries and a DC conversion circuit connected in series. The method for controlling the battery circuit in the energy storage inverter includes: in response to startup of the energy storage inverter, obtaining a total operating power corresponding to the multiple battery circuits; obtaining battery status information corresponding to each of the multiple battery circuits, and determining a target battery circuit for a control operation to be performed based on the battery status information; wherein the battery status information includes a current battery voltage value and battery SOC information; determining an allocated power corresponding to each target battery circuit based on the total operating power and the battery status information corresponding to the target battery circuit, and controlling the target battery circuit to operate according to the allocated power.

[0008] In some embodiments, the step of determining the allocated power corresponding to each target battery circuit based on the total operating power and the battery status information corresponding to the target battery circuit includes: when the total operating power is the total charging power, determining the allocated power corresponding to each target battery circuit during the charging operation based on the total charging power, the current battery voltage value indicated in the battery status information, the current battery SOC, and the maximum battery SOC; when the total operating power is the total discharging power, determining the allocated power corresponding to each target battery circuit during the discharging operation based on the total discharging power, the current battery voltage value indicated in the battery status information, the current battery SOC, and the minimum battery SOC.

[0009] In some embodiments, after the step of determining the allocated power corresponding to each target battery circuit, the step further includes: obtaining the power upper limit value corresponding to each target battery circuit, and determining whether the sum of the power upper limit values ​​corresponding to the target battery circuits is greater than or equal to the total operating power; if so, redistributing the difference of the determined allocated power based on the power upper limit value corresponding to each target battery circuit to update the allocated power corresponding to each target battery circuit; if not, using the power upper limit value corresponding to the target battery circuit as the allocated power corresponding to each target battery circuit.

[0010] In some embodiments, the step of redistributing the difference of the determined allocated power based on the power upper limit value corresponding to each target battery circuit includes: determining the difference power corresponding to each target battery circuit based on the power upper limit value of each target battery circuit and the determined allocated power; and redistributing the difference of each target battery circuit according to the power upper limit value and the difference power to update the allocated power corresponding to each target battery circuit.

[0011] In some embodiments, if the sum of the power upper limit values ​​of the target battery circuits is greater than the total operating power, it also includes: obtaining the power lower limit value corresponding to each target battery circuit, shutting down the target battery circuit whose allocated power is less than the power lower limit value, so as to update the target battery circuit; determining the allocated power corresponding to each updated target battery circuit based on the total operating power and the battery status information corresponding to the updated target battery circuit; and redistributing the difference of the determined allocated power based on the power upper limit value corresponding to the updated target battery circuit to update the allocated power corresponding to the updated target battery circuit.

[0012] In some embodiments, in response to the startup of the energy storage inverter, the step of obtaining the total operating power corresponding to the multiple battery circuits includes: receiving a battery charging instruction or a battery discharging instruction in response to the startup of the energy storage inverter; based on the battery charging instruction, obtaining a charging configuration strategy, PV power generation, and grid information, and calculating the total charging power corresponding to the multiple battery circuits; or, based on the battery discharging instruction, obtaining a discharging configuration strategy, user load information, and grid information, and calculating the total discharge power corresponding to the multiple battery circuits.

[0013] In some embodiments, the battery status information also includes battery switch status information and battery temperature information. After obtaining the battery status information corresponding to multiple battery circuits and determining the target battery circuit to be controlled based on the battery status information, it also includes: judging whether to perform a wake-up operation or a heating operation on each target battery circuit based on the battery switch status information and the battery temperature information. If so, performing the corresponding operation to put the target battery circuit into working state.

[0014] In the second aspect, the present application provides a control system for a battery circuit in an energy storage inverter. The control system is connected to the energy storage inverter and multiple battery circuits respectively, and is configured to implement control operations on the battery circuit; the multiple battery circuits are connected in parallel to the DC bus of the energy storage inverter, and the battery circuit includes batteries and DC conversion circuits connected in series; the control system includes an inverter control component and a battery circuit control component, the inverter control component is connected to the energy storage inverter, and is configured to detect the operating status of the energy storage inverter, and when it detects that the energy storage inverter starts running, it is configured to obtain the corresponding data of the multiple battery circuits from the energy storage inverter. The total working power of the inverter is obtained; the battery control component is connected to the multiple battery circuits respectively. When the inverter control component obtains the total working power, the battery control component is configured to obtain battery status information corresponding to the multiple battery circuits respectively, so as to determine the target battery circuit according to the battery status information; then, the allocated power corresponding to each target battery circuit is determined according to the total working power and the battery status information corresponding to the target battery circuit, and an instruction including the allocated power is sent to the corresponding target battery circuit, so that the target battery circuit operates according to the allocated power; wherein the battery status information includes the current battery voltage value and the battery SOC information.

[0015] In a third aspect, the present application provides an energy storage control system, comprising: a processor, and a memory for storing a program, wherein the program comprises instructions which, when executed by the processor, cause the processor to execute the control method for the battery circuit in the energy storage inverter provided in the first aspect.

[0016] In a fourth aspect, the present application provides a non-transitory machine-readable medium storing computer instructions, wherein the computer instructions are configured to cause a computer to execute the control method for a battery circuit in an energy storage inverter provided in the first aspect.

[0017] The present application adopts a technical approach of obtaining the total operating power corresponding to multiple battery circuits in response to the startup of an energy storage inverter; obtaining battery status information corresponding to each of the multiple battery circuits, and determining the target battery circuit for which a control operation is to be performed based on the battery status information; wherein the battery status information includes the current battery voltage value and battery SOC information; determining the allocated power corresponding to each target battery circuit based on the total operating power and the battery status information corresponding to the target battery circuit, and controlling the target battery circuit to operate according to the allocated power. This can increase the battery capacity of the energy storage inverter, achieve energy balancing control among multiple batteries, meet the user's load operation requirements, ensure load operation stability, and expand the applicable scenarios of the energy storage inverter. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] FIG1 is a first flow chart of a method for controlling a battery circuit in an energy storage inverter provided by the present application;

[0019] FIG2 is a second flow chart of a method for controlling a battery circuit in an energy storage inverter provided by the present application;

[0020] Figure 3 is a schematic diagram of the connection between the energy storage inverter and the photovoltaic modules, the power grid, the load, the multi-channel battery and the control system;

[0021] FIG4 is a schematic structural diagram of the electronic device provided in this application. Modes for Carrying Out the Invention

[0022] The following describes embodiments of the present application in more detail with reference to the accompanying drawings. Although certain embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be construed as being limited to the embodiments described herein. Instead, these embodiments are provided to provide a more thorough and complete understanding of the present application. It should be understood that the drawings and embodiments of the present application are configured for illustrative purposes only and are not configured to limit the scope of protection of the present application.

[0023] As household electricity consumption increases with improvements in user lives, energy storage inverters require larger batteries to meet these demands. While increasing battery capacity through technological innovation is the most direct approach, this typically takes time. Considering production costs, transportation, installation, and usage, the capacity of a single battery cell typically falls within an industry-standard range. Therefore, to further increase the battery capacity of energy storage inverters, there are generally two approaches: 1. Connect multiple batteries in series and then connect them to the energy storage inverter, that is, increase the total battery capacity by connecting the batteries in series. However, as the number of batteries in series increases, the battery port voltage will increase, and the energy storage inverter usually has a maximum input voltage limit. This results in a limited increase in the total battery capacity obtained by connecting the batteries in series, which is difficult to meet the operating requirements of the user load, resulting in a narrow application scenario for the energy storage inverter. 2. Connect multiple batteries in parallel to the energy storage inverter, that is, increase the total battery capacity by connecting multiple input batteries in parallel. However, due to differences in battery specifications, battery SOC, battery charge and discharge current limits, etc. among the multiple batteries connected in parallel, it is difficult to achieve battery energy balance control and ensure the stability of user load operation.

[0024] To this end, the present application provides a method for controlling a battery circuit in an energy storage inverter. As shown in FIG1 , the method for controlling a battery circuit in an energy storage inverter includes:

[0025] Step S101: In response to the start-up of the energy storage inverter, the total operating power corresponding to the multiple battery circuits is obtained.

[0026] Among them, the energy storage inverter provided in the embodiment of the present application connects multiple battery circuits in parallel to the energy storage inverter, that is, the total battery capacity is increased by connecting multiple input batteries in parallel.

[0027] In one example, multiple battery circuits are connected in parallel to a DC bus of an energy storage inverter, and the battery circuits include batteries and a DC conversion circuit connected in series.

[0028] Compared with increasing battery capacity by connecting batteries in series, which is limited by the battery port voltage, the battery capacity increase is limited. The parallel connection of multiple battery circuits provided in this application can significantly increase the battery capacity. In actual application, the number of parallel battery circuits can be increased according to the actual needs of the user's home load. The battery capacity increase is not limited, thereby meeting the user's load operation needs and expanding the applicable scenarios of the energy storage inverter.

[0029] In some embodiments, in response to the startup of the energy storage inverter, the step of obtaining the total operating power corresponding to the multiple battery circuits includes: receiving a battery charging instruction or a battery discharging instruction in response to the startup of the energy storage inverter; based on the battery charging instruction, obtaining a charging configuration strategy, PV (Photo Voltaic) power generation, and grid information, and calculating the total charging power corresponding to the multiple battery circuits; or, based on the battery discharging instruction, obtaining a discharging configuration strategy, user load information, and grid information, and calculating the total discharge power corresponding to the multiple battery circuits.

[0030] Among them, the total working power refers to the total working power that multiple battery circuits need to execute. After the energy storage inverter is started, according to the actual operating conditions, if it is in the PV power generation stage, the battery can be charged, that is, a battery charging instruction is generated; if the PV is not in the power generation stage and needs to supply power to the load, a battery discharge instruction is generated. The energy storage inverter will calculate the charging power or discharge power required by the current battery circuit based on the user's settings (the charging configuration strategy and discharge configuration strategy set by the user), the PV power generation situation, the household load situation, and the power grid situation. For the multi-channel battery circuits involved in the embodiments of the present application, all battery circuits can be regarded as a whole, and the total battery charging power or total discharge power can be calculated according to the energy control logic of the single battery.

[0031] Step S102 , obtaining battery status information corresponding to the multiple battery circuits, and determining a target battery circuit to be controlled based on the battery status information; wherein the battery status information includes current battery voltage value and battery SOC information.

[0032] Taking into account the differences in battery specifications, battery SOC, battery charge and discharge current limits, etc. among multiple batteries, when controlling the battery circuit, this application does not need to simultaneously control the energy balancing control of all battery circuits connected to the energy storage inverter. Instead, the actual operating conditions of the battery circuit can be comprehensively considered in combination with the battery status information to determine the target battery circuit to be controlled, thereby ensuring the operational stability of the battery circuit, facilitating the subsequent reasonable and balanced distribution of work efficiency, and improving the control effect of the battery circuit.

[0033] In some embodiments, the battery status information also includes battery switch status information and battery temperature information. After obtaining the battery status information corresponding to multiple battery circuits and determining the target battery circuit to be controlled based on the battery status information, it also includes: judging whether to perform a wake-up operation or a heating operation on each target battery circuit based on the battery switch status information and the battery temperature information. If so, performing the corresponding operation to put the target battery circuit into working state.

[0034] In the control method provided in the embodiment of the present application, independent control is performed on the behavior of each battery. Battery behavior refers to operations such as battery shutdown and startup, battery replenishment, battery wake-up, and battery heating. This allows batteries of different specifications to be connected in parallel to the energy storage inverter, meeting the differentiated needs of batteries.

[0035] Step S103 : determining the allocated power corresponding to each target battery circuit according to the total operating power and the battery status information corresponding to the target battery circuit, and controlling the target battery circuit to operate according to the allocated power.

[0036] After determining the target battery circuit involved in the control operation and the total operating power corresponding to the multiple battery circuits, the initial power allocation can be completed by simply combining the battery SOC information in the target battery circuit. Based on the initial power allocation result, the target battery circuit can be controlled to perform charge / discharge operations.

[0037] In some embodiments, the step of determining the allocated power corresponding to each target battery circuit based on the total operating power and the battery status information corresponding to the target battery circuit includes: when the total operating power is the total charging power, determining the allocated power corresponding to each target battery circuit during the charging operation based on the total charging power, the current battery voltage value indicated in the battery status information, the current battery SOC, and the maximum battery SOC; when the total operating power is the total discharging power, determining the allocated power corresponding to each target battery circuit during the discharging operation based on the total discharging power, the current battery voltage value indicated in the battery status information, the current battery SOC, and the minimum battery SOC.

[0038] The maximum battery SOC provided in the embodiments of the present application refers to the maximum SOC value allowed for charging of the battery; the minimum SOC refers to the minimum SOC value allowed for discharging of the battery.

[0039] According to the description of the embodiment of the present application, if a discharge operation is performed (corresponding to allocating total discharge power), the amount of the battery's dischargeable capacity during the discharge operation is obtained by subtracting the battery's current SOC from the minimum SOC allowed for discharge, multiplying the result by the battery voltage. The total discharge power is then allocated according to the ratio of the corresponding amounts of dischargeable capacity for the target battery circuits. If a charge operation is performed (corresponding to allocating total charging power), the amount of the battery's chargeable capacity is obtained by subtracting the battery's current SOC from the maximum SOC allowed for charge, multiplying the result by the battery voltage. The total charging power is then allocated according to the ratio of the corresponding amounts of chargeable capacity.

[0040] In some embodiments, after the step of determining the allocated power corresponding to each target battery circuit, the step further includes: obtaining the power upper limit value corresponding to each target battery circuit, and determining whether the sum of the power upper limit values ​​corresponding to the target battery circuits is greater than or equal to the total operating power; if so, redistributing the difference of the determined allocated power based on the power upper limit value corresponding to each target battery circuit to update the allocated power corresponding to each target battery circuit; if not, using the power upper limit value corresponding to the target battery circuit as the allocated power corresponding to each target battery circuit.

[0041] During actual operation, the allowable operating current (current limiting condition) of the battery will be affected by many factors. For example, when the temperature drops, the maximum discharge current and charging current will decrease, when the battery SOC decreases, the maximum discharge current will decrease, and when the battery SOC increases, the maximum charging current will decrease. In addition, the DC (Direct Current) / DC conversion current may also need to be reduced due to overtemperature. Therefore, the initial power allocation result completed by combining only the battery SOC information in the target battery circuit is not optimal during the execution process. The allocated power may be limited due to the current limiting factor, making it difficult to output. Therefore, the embodiment of the present application takes the current limiting condition of each battery circuit into consideration, characterizes the current limiting condition with the power upper limit value corresponding to each battery circuit, updates the initial allocated power, ensures the operating stability of the energy storage inverter, and improves the control effect of the battery circuit.

[0042] In some embodiments, the step of redistributing the difference of the determined allocated power based on the power upper limit value corresponding to each target battery circuit includes: determining the difference power corresponding to each target battery circuit based on the power upper limit value of each target battery circuit and the determined allocated power; and redistributing the difference of each target battery circuit according to the power upper limit value and the difference power to update the allocated power corresponding to each target battery circuit.

[0043] This embodiment provides a specific implementation method for performing differential power distribution in combination with the current limit of the battery circuit (the upper power limit of the battery circuit). It can be understood that this application improves the energy balance control of the battery circuit through differential redistribution.

[0044] In some embodiments, if the sum of the power upper limit values ​​of the target battery circuits is greater than the total operating power, it also includes: obtaining the power lower limit value corresponding to each target battery circuit, shutting down the target battery circuit whose allocated power is less than the power lower limit value, so as to update the target battery circuit; determining the allocated power corresponding to each updated target battery circuit based on the total operating power and the battery status information corresponding to the updated target battery circuit; and redistributing the difference of the determined allocated power based on the power upper limit value corresponding to the updated target battery circuit to update the allocated power corresponding to the updated target battery circuit.

[0045] The loss of the battery circuit during operation is generally composed of switching loss and conduction loss. The switching loss is mainly affected by the characteristics of the switching device of the DC / DC circuit, the operating frequency and other factors, while the conduction loss is closely related to the operating current of the battery circuit. As the operating current of the DC / DC circuit decreases, the conduction loss will decrease at first. Later, even if the current is very small, a considerable part of the switches will be damaged. Therefore, when working with low current, the efficiency of the DC / DC is very low. The embodiment of the present application takes efficiency optimization into consideration. By using the power lower limit value corresponding to the battery circuit, the battery circuit with higher loss is turned off. While ensuring the energy balance control of the battery circuit, the efficiency optimization distribution is improved, the working efficiency of the battery circuit is improved, and the operating efficiency of the energy storage inverter is improved.

[0046] The control method for battery circuits in an energy storage inverter provided in an embodiment of the present application adopts a method for obtaining the total operating power corresponding to multiple battery circuits in response to the startup of the energy storage inverter; obtaining battery status information corresponding to each of the multiple battery circuits, and determining a target battery circuit for executing a control operation based on the battery status information; wherein the battery status information includes a current battery voltage value and battery SOC information; and determining the allocated power corresponding to each target battery circuit based on the total operating power and the battery status information corresponding to the target battery circuit, and controlling the target battery circuit to operate according to the allocated power. This technical means solves the technical problems of a small total battery capacity that cannot meet user needs, difficulty in achieving energy balancing control of each battery, difficulty in ensuring the stability of user load operation, and narrow application scenarios of the energy storage inverter. This achieves the technical effect of increasing the battery capacity of the energy storage inverter, achieving energy balancing control among multiple batteries, meeting the user's load operation needs, ensuring load operation stability, and expanding the application scenarios of the energy storage inverter.

[0047] Another embodiment of the present application provides a method for controlling a battery circuit in an energy storage inverter, which should be configured as an energy storage system in which multiple battery circuits are connected in parallel to the energy storage inverter. As shown in FIG2 , the method for controlling a battery circuit in an energy storage inverter includes:

[0048] Step S201: In response to the start-up of the energy storage inverter, a battery charging instruction or a battery discharging instruction is received; based on the battery charging instruction, a charging configuration strategy, PV power generation, and grid information are obtained, and a total charging power corresponding to multiple battery circuits is calculated; or, based on the battery discharging instruction, a discharging configuration strategy, user load information, and grid information are obtained, and a total discharging power corresponding to multiple battery circuits is calculated.

[0049] The energy storage inverter provided in the embodiments of the present application connects multiple battery circuits in parallel to the energy storage inverter, increasing the total battery capacity by connecting multiple input batteries in parallel. In one example, multiple battery circuits are connected in parallel to the DC bus of the energy storage inverter, and the battery circuits include batteries and a DC conversion circuit connected in series.

[0050] Figure 3 shows a schematic diagram of the connection between an energy storage inverter and a photovoltaic module, a power grid, a load, multiple batteries, and a control system. As shown in Figure 3, the energy storage inverter is connected to the photovoltaic module A1, the battery A6 / A8, the AC power grid A5, and the user's home load (wherein, the user's home load is not shown in Figure 3). The battery A6 / A8 is connected in series with the DC conversion circuit, and the two battery circuits are connected in parallel to the A3 DC bus. Compared to increasing battery capacity by connecting batteries in series, which is limited by the battery port voltage, the parallel connection of multiple battery circuits provided in this application can significantly increase battery capacity. In actual application, the number of parallel battery circuits can be increased according to the actual needs of the user's home load. The battery capacity increase is not limited, thereby meeting the needs of user load operation and expanding the applicable scenarios of the energy storage inverter.

[0051] For the multi-channel battery circuits involved in the embodiments of the present application, all battery circuits can be regarded as a whole, and the total battery charging power or total discharge power can be calculated according to the energy control logic of a single battery.

[0052] Step S202 , obtaining battery status information corresponding to the multiple battery circuits, and determining a target battery circuit to be controlled based on the battery status information; wherein the battery status information includes current battery voltage value and battery SOC information.

[0053] Taking into account the differences in battery specifications, battery SOC, battery charge and discharge current limits, etc. among multiple batteries, the embodiment of the present application does not require that all battery circuits connected to the energy storage inverter participate in energy balancing control at the same time when controlling the battery circuit. Instead, the actual operating conditions of the battery circuit are comprehensively considered in combination with the battery status information to determine the target battery circuit to be controlled. This ensures the operational stability of the battery circuit, helps to reasonably and evenly distribute work efficiency in the future, and improves the control effect of the battery circuit.

[0054] In some embodiments, the battery status information also includes battery switch status information and battery temperature information. After obtaining the battery status information corresponding to multiple battery circuits and determining the target battery circuit to be controlled based on the battery status information, it also includes: judging whether to perform a wake-up operation or a heating operation on each target battery circuit based on the battery switch status information and the battery temperature information. If so, performing the corresponding operation to put the target battery circuit into working state.

[0055] In the control method provided in the embodiment of the present application, independent control is performed on the behavior of each battery. Battery behavior refers to operations such as battery shutdown and startup, battery replenishment, battery wake-up, and battery heating. This allows batteries of different specifications to be connected in parallel to the energy storage inverter, meeting the differentiated needs of batteries.

[0056] Step S203 : determining the corresponding allocated power of each target battery circuit during the charging operation according to the total charging power, the current battery voltage value indicated in the battery status information, the current battery SOC, and the maximum battery SOC.

[0057] Step S204 : determining the corresponding allocated power of each target battery circuit in the discharge operation according to the total discharge power, the current battery voltage value indicated in the battery status information, the current battery SOC, and the minimum battery SOC.

[0058] The maximum battery SOC provided in the embodiments of the present application refers to the maximum SOC value allowed for charging of the battery; the minimum SOC refers to the minimum SOC value allowed for discharging of the battery.

[0059] According to the description of the embodiment of the present application, if a discharge operation is performed (corresponding to allocating total discharge power), the amount of the battery's dischargeable capacity during the discharge operation is obtained by subtracting the battery's current SOC from the minimum SOC allowed for discharge, multiplying the result by the battery voltage. The total discharge power is then allocated according to the ratio of the corresponding amounts of dischargeable capacity for the target battery circuits. If a charge operation is performed (corresponding to allocating total charging power), the amount of the battery's chargeable capacity is obtained by subtracting the battery's current SOC from the maximum SOC allowed for charge, multiplying the result by the battery voltage. The total charging power is then allocated according to the ratio of the corresponding amounts of chargeable capacity.

[0060] According to a specific implementation of the embodiment of the present application, the expression for calculating the relevant amount of dischargeable power of each battery circuit is as follows:

[0061] Among them, n refers to the nth battery circuit, It is proportional to the energy that can be discharged by the battery circuit and is an indicator of the discharge capacity of the nth battery circuit. is the current battery SOC of the nth battery circuit, It is the minimum battery SOC of the nth battery set by the user. After the battery is discharged to this value, it will no longer discharge. is the battery voltage value of the nth battery circuit.

[0062] Then, the discharge power of each battery circuit is allocated according to the proportional relationship of the battery's dischargeable power Wn , the expression is as follows:

[0063] in, Refers to the total discharge power corresponding to multiple battery circuits.

[0064] According to a specific implementation of the embodiment of the present application, the expression for calculating the relevant amount of chargeable power of each battery circuit is as follows:

[0065] in, The maximum SOC of the battery in the nth battery circuit is 0, and the battery will not be charged further after it is charged to this value. The distribution of discharge power is performed by dividing the total discharge power by the ratio of the relevant amount of chargeable power calculated in this embodiment.

[0066] Step S205: Obtain the power upper limit value corresponding to each target battery circuit, and determine whether the sum of the power upper limit values ​​corresponding to the target battery circuits is greater than or equal to the total operating power; if so, redistribute the difference of the determined allocated power based on the power upper limit value corresponding to each target battery circuit to update the allocated power corresponding to each target battery circuit; if not, use the power upper limit value corresponding to the target battery circuit as the allocated power corresponding to each target battery circuit.

[0067] During actual operation, the allowable operating current (current limit) of the battery will be affected by many factors. For example, when the temperature drops, the maximum discharge current and charging current will decrease, the battery SOC decreases, the maximum discharge current decreases, and the battery SOC increases, the maximum charging current decreases. In addition, the DC / DC conversion current may also need to be reduced due to overtemperature. Therefore, the initial power allocation result completed by combining only the battery SOC information in the target battery circuit is not optimal during the execution process. The allocated power may be limited due to the current limit factor, making it difficult to output. Therefore, this application takes the current limit of each battery circuit into consideration, characterizes the current limit with the power upper limit value corresponding to each battery circuit, updates the initial allocated power, ensures the operating stability of the energy storage inverter, and improves the control effect of the battery circuit.

[0068] In some embodiments, the step of redistributing the difference of the determined allocated power based on the power upper limit value corresponding to each target battery circuit includes: determining the difference power corresponding to each target battery circuit based on the power upper limit value of each target battery circuit and the determined allocated power; and redistributing the difference of each target battery circuit according to the power upper limit value and the difference power to update the allocated power corresponding to each target battery circuit.

[0069] This embodiment provides a specific implementation method for performing differential power distribution in combination with the current limit of the battery circuit (the upper power limit of the battery circuit). It can be understood that this application improves the energy balance control of the battery circuit through differential redistribution.

[0070] According to a specific implementation of an embodiment of the present application, a specific implementation of differential power redistribution is also provided. Taking total discharge power as an example, the method first calculates whether the sum of the power upper limits of all target battery circuits is greater than the total discharge power. If not, it indicates that the target battery circuits cannot output the total discharge power. In this case, all target battery circuits can output power according to their respective power upper limits (Plim). If so, it indicates that the target battery circuits can output the total discharge power (Ptotal). Next, differential power redistribution is performed for each battery circuit.

[0071] For example, if there are two battery circuits, namely battery circuit 1 and battery circuit 2, when the current allocated power (Pa1) of battery circuit 1 is greater than the power upper limit (Plim1), the current allocated power (Pa1) of battery circuit 1 is adjusted to obtain an adjusted allocated power (Pa2). The difference power (Pa1-Pa2) between the current allocated power (Pa1) of battery circuit 1 and the adjusted allocated power (Pa2) can be added to battery circuit 2 to adjust the current allocated power (Pb1) of battery circuit 2 to obtain an adjusted allocated power (Pb2), i.e., Pb2=Pb1+Pa1-Pa2. When the current allocated power (Pa1) of battery circuit 1 is equal to the power upper limit (Plim1), battery circuit 1 temporarily outputs the current allocated power (Pa1).

[0072] It is understood that if there are more than two battery circuits, as long as the current allocated power of one battery circuit exceeds the power cap, the remaining power of that battery circuit is allocated to the next adjacent battery circuit, and then the next adjacent battery circuit is operated. When the next adjacent battery circuit exceeds the power cap, the remaining power allocation is continued in the same manner to achieve energy balancing control among multiple batteries. In addition, if the current allocated power of the last battery circuit is greater than the power cap, the remaining power of the last battery circuit can be directly allocated to the first battery circuit, forming a closed loop among the multiple battery circuits.

[0073] In some embodiments, if the sum of the power upper limit values ​​of the target battery circuits is greater than the total operating power, the control method further includes: obtaining the power lower limit value corresponding to each target battery circuit, shutting down the target battery circuit whose allocated power is less than the power lower limit value, so as to update the target battery circuit; determining the allocated power corresponding to each updated target battery circuit based on the total operating power and the battery status information corresponding to the updated target battery circuit; and redistributing the difference of the determined allocated power based on the power upper limit value corresponding to the updated target battery circuit to update the allocated power corresponding to the updated target battery circuit.

[0074] The loss of the battery circuit during operation is generally composed of switching loss and conduction loss. The switching loss is mainly affected by the characteristics of the switching device of the DC / DC circuit, the operating frequency and other factors, while the conduction loss is closely related to the operating current of the battery circuit. As the operating current of the DC / DC circuit decreases, the conduction loss will decrease at first. Later, even if the current is very small, a considerable part of the switches will be damaged. Therefore, when working with low current, the efficiency of the DC / DC is very low. The embodiment of the present application takes efficiency optimization into consideration. By using the power lower limit value corresponding to the battery circuit, the battery circuit with higher loss is turned off. While ensuring the energy balance control of the battery circuit, the efficiency optimization distribution is improved, the working efficiency of the battery circuit is improved, and the operating efficiency of the energy storage inverter is improved.

[0075] According to a specific implementation of the embodiment of the present application, for example, the discharge power allocated to the first path is 25W, and the loss of the circuit operation may be 50W. Obviously, the first battery circuit should be turned off at this time, and the other paths should be allowed to output an additional 25W, in order to optimize the output efficiency. Specifically, a working threshold power (or current), that is, a power lower limit value, can be set first, for example, the power lower limit value Pmin=500W is set. When the allocated power of the nth path is less than Pmin, the allocated power of the path begins to be adjusted. First, it is set to 0, and the power of the path is allocated to other unrestricted circuits. If other paths are also restricted, the output power of the path is adjusted to Pmin. Taking two battery circuits as an example, if Pb1=50W, Pb2=2000W, and Plim2=5000W, the first path is turned off and the second path is allowed to output 2050W. If Pb1=50W, Pb2=4980W, Plim2=5000W, the second channel can only output a maximum of 5000W due to power limitation, and it is difficult to output 5030W. Therefore, let the first channel output 500W and the second channel output 4530W. This application adjusts the number of battery circuits involved in the work according to the output power limitation, rather than all battery circuits working all the time, avoiding long-term low-power operation of some battery circuits, which helps to improve efficiency.

[0076] Step S206 , controlling the target battery circuit to operate according to the allocated power.

[0077] The control method for battery circuits in an energy storage inverter provided in an embodiment of the present application obtains the total operating power corresponding to multiple battery circuits in response to the startup of the energy storage inverter; obtains battery status information corresponding to each of the multiple battery circuits, and determines the target battery circuit for executing a control operation based on the battery status information; wherein the battery status information includes the current battery voltage value and battery SOC information; and determines the allocated power corresponding to each target battery circuit based on the total operating power and the battery status information corresponding to the target battery circuit, and controls the target battery circuit to operate according to the allocated power. This technical means solves the technical problems that the total battery capacity is small and cannot meet user needs, the energy balance control of each battery is difficult to achieve, the stability of user load operation is difficult to ensure, and the applicable scenarios of the energy storage inverter are narrow. This achieves the technical effect of increasing the battery capacity of the energy storage inverter, achieving energy balance control among multiple batteries, meeting the user's load operation needs, ensuring load operation stability, and expanding the applicable scenarios of the energy storage inverter.

[0078] Based on the control method of the battery circuit in the energy storage inverter provided in the embodiment of the present application, the embodiment of the present application also provides a control system for the battery circuit in the energy storage inverter, as shown in Figure 3. The control system is respectively connected to the energy storage inverter and the multiple battery circuits, and is configured to implement control operations on the battery circuit; wherein the multiple battery circuits are connected in parallel to the DC bus of the energy storage inverter, and the battery circuit includes batteries and a DC conversion circuit connected in series.

[0079] In one example, according to an embodiment of the present application, the control system includes an inverter control component and a battery circuit control component, wherein the inverter control component is connected to the energy storage inverter and is configured to detect the operating status of the energy storage inverter, and when it is detected that the energy storage inverter starts running, it is configured to obtain the total operating power corresponding to multiple battery circuits from the energy storage inverter.

[0080] The energy storage inverter provided in the embodiments of the present application connects multiple battery circuits in parallel to the energy storage inverter, that is, increases the total battery capacity by connecting multiple input batteries in parallel. Compared to increasing battery capacity by connecting batteries in series, which is limited by the battery port voltage, the parallel connection of multiple battery circuits provided in the embodiments of the present application can significantly increase battery capacity. In actual application, the number of parallel battery circuits can be increased according to the actual needs of the user's home load, and the battery capacity increase is unrestricted, thereby meeting the user's load operation needs and expanding the applicable scenarios of the energy storage inverter.

[0081] In some embodiments, the inverter control component is further configured to: receive a battery charging instruction or a battery discharging instruction in response to the start-up of the energy storage inverter; obtain a charging configuration strategy, PV power generation, and grid information based on the battery charging instruction, and calculate the total charging power corresponding to the multiple battery circuits; or, obtain a discharge configuration strategy, user load information, and grid information based on the battery discharging instruction, and calculate the total discharge power corresponding to the multiple battery circuits.

[0082] Among them, the total working power refers to the total working power that multiple battery circuits need to execute. After the energy storage inverter is started, according to the actual operating conditions, if it is in the PV power generation stage, the battery can be charged, that is, a battery charging instruction is generated; if the PV is not in the power generation stage and needs to supply power to the load, a battery discharge instruction is generated. The energy storage inverter will calculate the charging power or discharge power required by the current battery circuit based on the user's settings (the charging configuration strategy and discharge configuration strategy set by the user), the PV power generation situation, the household load situation, and the power grid situation. For the multi-channel battery circuits involved in the embodiments of the present application, all battery circuits can be regarded as a whole, and the total battery charging power or total discharge power can be calculated according to the energy control logic of the single battery.

[0083] The battery control component is connected to multiple battery circuits respectively. When the inverter control component obtains the total operating power, the battery control component is configured to obtain battery status information corresponding to the multiple battery circuits respectively, so as to determine the target battery circuit according to the battery status information; then, the allocated power corresponding to each target battery circuit is determined according to the total operating power and the battery status information corresponding to the target battery circuit, and an instruction including the allocated power is sent to the corresponding target battery circuit, so that the target battery circuit operates according to the allocated power; wherein the battery status information includes the current battery voltage value and the battery SOC information.

[0084] Taking into account the differences in battery specifications, battery SOC, battery charge and discharge current limits, etc. among multiple batteries, the embodiment of the present application does not require that all battery circuits connected to the energy storage inverter participate in energy balancing control at the same time when controlling the battery circuit. Instead, the actual operating conditions of the battery circuit are comprehensively considered in combination with the battery status information to determine the target battery circuit to be controlled. This ensures the operational stability of the battery circuit, helps to reasonably and evenly distribute work efficiency in the future, and improves the control effect of the battery circuit.

[0085] In some embodiments, the battery status information also includes battery switch status information and battery temperature information. After obtaining the battery status information corresponding to multiple battery circuits and determining the target battery circuit to be controlled based on the battery status information, the battery control component is further configured to: determine whether to perform a wake-up operation or a heating operation on each target battery circuit based on the battery switch status information and the battery temperature information; if so, perform the corresponding operation to put the target battery circuit into working state.

[0086] In the control method provided in the embodiment of the present application, independent control is performed on the behavior of each battery. Battery behavior refers to operations such as battery shutdown and startup, battery replenishment, battery wake-up, and battery heating. This allows batteries of different specifications to be connected in parallel to the energy storage inverter, meeting the differentiated needs of batteries.

[0087] After determining the target battery circuit involved in the control operation and the total operating power corresponding to the multiple battery circuits, the initial power allocation can be completed by simply combining the battery SOC information in the target battery circuit. Based on the initial power allocation result, the target battery circuit can be controlled to perform charge / discharge operations.

[0088] In some embodiments, the battery control component is further configured to: when the total operating power is the total charging power, determine the corresponding allocated power of each target battery circuit during the charging operation based on the total charging power, the current battery voltage value indicated in the battery status information, the current battery SOC, and the maximum battery SOC; when the total operating power is the total discharging power, determine the corresponding allocated power of each target battery circuit during the discharging operation based on the total discharging power, the current battery voltage value indicated in the battery status information, the current battery SOC, and the minimum battery SOC.

[0089] The maximum battery SOC provided in the embodiments of the present application refers to the maximum SOC value allowed for charging of the battery; the minimum SOC refers to the minimum SOC value allowed for discharging of the battery.

[0090] According to the description of the embodiment of the present application, if a discharge operation is performed (corresponding to allocating total discharge power), the amount of the battery's dischargeable capacity during the discharge operation is obtained by subtracting the battery's current SOC from the minimum SOC allowed for discharge, multiplying the result by the battery voltage. The total discharge power is then allocated according to the ratio of the corresponding amounts of dischargeable capacity for the target battery circuits. If a charge operation is performed (corresponding to allocating total charging power), the amount of the battery's chargeable capacity is obtained by subtracting the battery's current SOC from the maximum SOC allowed for charge, multiplying the result by the battery voltage. The total charging power is then allocated according to the ratio of the corresponding amounts of chargeable capacity.

[0091] In some embodiments, after the step of determining the allocated power corresponding to each target battery circuit, the battery control component is further configured to: obtain the power upper limit value corresponding to each target battery circuit, and determine whether the sum of the power upper limit values ​​corresponding to the target battery circuits is greater than or equal to the total operating power; if so, redistribute the difference of the determined allocated power based on the power upper limit value corresponding to each target battery circuit to update the allocated power corresponding to each target battery circuit; if not, use the power upper limit value corresponding to the target battery circuit as the allocated power corresponding to each target battery circuit.

[0092] During actual operation, the allowable operating current (current limiting condition) of the battery will be affected by many factors. For example, when the temperature drops, the maximum discharge current and charging current will decrease, the battery SOC decreases, the maximum discharge current decreases, and the battery SOC increases, the maximum charging current decreases. In addition, the DC / DC conversion current may also need to be reduced due to overtemperature. Therefore, the initial power allocation result completed by combining only the battery SOC information in the target battery circuit is not optimal during the execution process. The allocated power may be limited due to the current limiting factor, making it difficult to output. Therefore, the embodiment of the present application takes the current limiting condition of each battery circuit into consideration, characterizes the current limiting condition with the power upper limit value corresponding to each battery circuit, updates the initial allocated power, ensures the operating stability of the energy storage inverter, and improves the control effect of the battery circuit.

[0093] In some embodiments, the battery control component is further configured to: determine the differential power corresponding to each target battery circuit based on the power upper limit value and the determined allocated power of each target battery circuit; and redistribute the differential power of each target battery circuit according to the power upper limit value and the differential power to update the allocated power corresponding to each target battery circuit.

[0094] This embodiment provides a specific implementation method for performing differential power distribution in combination with the current limit of the battery circuit (the upper power limit of the battery circuit). It can be understood that this application improves the energy balance control of the battery circuit through differential redistribution.

[0095] In some embodiments, if the sum of the power upper limit values ​​of the target battery circuits is greater than the total operating power, the battery control component is further configured to: obtain the power lower limit value corresponding to each target battery circuit, shut down the target battery circuit whose allocated power is less than the power lower limit value, so as to update the target battery circuit; determine the allocated power corresponding to each updated target battery circuit based on the total operating power and the battery status information corresponding to the updated target battery circuit; and redistribute the difference of the determined allocated power based on the power upper limit value corresponding to the updated target battery circuit to update the allocated power corresponding to the updated target battery circuit.

[0096] The loss of the battery circuit during operation is generally composed of switching loss and conduction loss. The switching loss is mainly affected by the characteristics of the switching devices of the DC / DC circuit, the operating frequency and other factors, while the conduction loss is closely related to the operating current of the battery circuit. As the operating current of the DC / DC circuit decreases, the conduction loss will decrease at first. Later, even if the current is very small, a considerable part of the switches will be damaged. Therefore, when working with low current, the efficiency of the DC / DC is very low. This application takes efficiency optimization into consideration, and turns off the battery circuit with higher loss through the power lower limit corresponding to the battery circuit. While ensuring the energy balance control of the battery circuit, it improves the efficiency optimization distribution, improves the working efficiency of the battery circuit, and improves the operating efficiency of the energy storage inverter.

[0097] The control system of the battery circuit in the energy storage inverter provided in the embodiment of the present application is configured to realize the control operation of the battery circuit because the control system is respectively connected to the energy storage inverter and the multiple battery circuits; wherein the multiple battery circuits are connected in parallel to the DC bus of the energy storage inverter, and the battery circuit includes batteries and DC conversion circuits connected in series; the control system includes an inverter control component and a battery circuit control component, wherein the inverter control component is connected to the energy storage inverter and is configured to detect the operating status of the energy storage inverter, and when it is detected that the energy storage inverter starts to operate, it is configured to obtain the total working power corresponding to the multiple battery circuits from the energy storage inverter; the battery control components are respectively connected to the multiple battery circuits, and when the inverter control component obtains the total working power, the battery control component is configured to obtain the battery status corresponding to the multiple battery circuits respectively. state information, so as to determine the target battery circuit according to the battery status information; then determine the allocated power corresponding to each target battery circuit according to the total working power and the battery status information corresponding to the target battery circuit, and send the instruction including the allocated power to the corresponding target battery circuit, so that the target battery circuit operates according to the allocated power; wherein the battery status information includes the current battery voltage value and the battery SOC information, which solves the technical problems that the total battery capacity is small and it is difficult to meet user needs, each battery is difficult to achieve energy balancing control, it is difficult to ensure the stability of user load operation, and the applicable scenarios of the energy storage inverter are narrow. It achieves the technical effect of increasing the battery capacity of the energy storage inverter, achieving energy balancing control among multiple batteries, being able to meet the user's load operation needs, ensuring the stability of load operation, and expanding the applicable scenarios of the energy storage inverter.

[0098] An embodiment of the present application also provides a non-transitory machine-readable medium storing a computer program, wherein the computer program, when executed by a processor of a computer, is configured to cause the computer to execute the method of the embodiment of the present application.

[0099] An embodiment of the present application further provides a computer program product, including a computer program, wherein the computer program, when executed by a processor of a computer, is configured to cause the computer to execute the method of the embodiment of the present application.

[0100] An embodiment of the present application further provides an energy storage control system, comprising: at least one processor; and a memory communicatively connected to the at least one processor. The memory stores a computer program executable by the at least one processor, and when executed by the at least one processor, the computer program is configured to cause an electronic device to perform the method of the embodiment of the present application.

[0101] With reference to Figure 4, a block diagram of an electronic device that can be used as a server or client of an embodiment of the present application will now be described, which is an example of a hardware device that can be applied to various aspects of the present application. The electronic device is intended to represent various forms of digital electronic computer equipment, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices, and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present application described and / or required herein.

[0102] As shown in Figure 4, the electronic device includes a computing component 401, which can perform various appropriate actions and processes based on a computer program stored in a read-only memory (ROM) 402 or a computer program loaded from a storage component 408 into a random access memory (RAM) 403. RAM 403 can also store various programs and data required for the operation of the electronic device. Computing component 401, ROM 402, and RAM 403 are interconnected via a bus 404. An input / output (I / O) interface 405 is also connected to bus 404.

[0103] Multiple components within the electronic device are connected to the I / O interface 405, including an input component 406, an output component 407, a storage component 408, and a communication component 409. The input component 406 can be any type of device capable of inputting information into the electronic device. The input component 406 can receive input digital or character information and generate key signal inputs related to user settings and / or function control of the electronic device. The output component 407 can be any type of device capable of presenting information and can include, but is not limited to, a display, a speaker, a video / audio output terminal, a vibrator, and / or a printer. The storage component 408 can include, but is not limited to, a magnetic disk or an optical disk. The communication component 409 allows the electronic device to exchange information / data with other devices via a computer network such as the Internet and / or various telecommunication networks, and can include, but is not limited to, a modem, a network card, an infrared communication device, and / or a wireless communication transceiver, such as a Bluetooth device, a WiFi device, a WiMax device, a cellular communication device, and / or the like.

[0104] Computing component 401 can be any general-purpose and / or specialized processing component with processing and computing capabilities. Some examples of computing component 401 include, but are not limited to, a CPU, a graphics processing unit (GPU), various specialized artificial intelligence (AI) computing components, various computing components that run machine learning model algorithms, a digital signal processor (DSP), and any suitable processor, controller, microcontroller, etc. Computing component 401 performs the various methods and processes described above. For example, in some embodiments, the method embodiments of the present application can be implemented as a computer program tangibly embodied in a machine-readable medium, such as storage component 408. In some embodiments, part or all of the computer program can be loaded and / or installed on an electronic device via ROM 402 and / or communication component 409. In some embodiments, computing component 401 can be configured to execute the control method for the battery circuit in the energy storage inverter through any other suitable means (e.g., via firmware).

[0105] The computer programs of the methods of the embodiments of the present application can be written in any combination of one or more programming languages. These computer programs can be provided to a processor or controller of a general-purpose computer, a special-purpose computer, or other programmable data processing device, so that when the computer program is executed by the processor or controller, the functions / operations specified in the flow chart and / or block diagram are implemented. The computer program can be executed entirely on the machine, partially on the machine, as a stand-alone software package, partially on the machine and partially on a remote machine, or entirely on a remote machine or server.

[0106] In the context of embodiments of the present application, a machine-readable medium may be a tangible medium that may contain or store a program for use by or in conjunction with an instruction execution system, apparatus, or device. A machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. A machine-readable signal medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, or infrared system, apparatus, or device, or any suitable combination of the contents provided herein. More specific examples of machine-readable storage media may include an electrical connection based on one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the contents provided herein.

[0107] It should be noted that the term "including" and its variations used in the embodiments of the present application are open inclusions, that is, "including but not limited to". The term "based on" means "at least partially based on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; the term "some embodiments" means "at least some embodiments". The modifications of "one" and "multiple" mentioned in the embodiments of the present application are illustrative and not restrictive. Those skilled in the art should understand that unless the context clearly indicates otherwise, it should be understood as "one or more".

[0108] The various steps described in the method implementation schemes provided in the embodiments of the present application can be performed in different orders and / or in parallel. In addition, the method implementation schemes may include additional steps and / or omit the steps shown. The scope of protection of the present application is not limited in this respect.

[0109] The term "embodiment" in this specification refers to specific features, structures or characteristics described in conjunction with the embodiment that can be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily mean the same embodiment, nor does it mean that it is mutually exclusive with other embodiments and is independent or optional. The various embodiments in this specification are described in a related manner, and the same or similar parts between the various embodiments are referenced to each other. In particular, for the device, equipment, and system embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts are referred to the partial description of the method embodiment.

[0110] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of protection. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and such modifications and improvements are all within the scope of protection of the present application. Therefore, the scope of protection of the present application shall be determined by the appended claims.

Claims

1. A method for controlling a battery circuit in an energy storage inverter, wherein multiple battery circuits are connected in parallel to a DC bus of the energy storage inverter, the battery circuits comprising batteries and a DC conversion circuit connected in series, the method comprising: In response to the start-up of the energy storage inverter, obtaining the total operating power corresponding to the multiple battery circuits; Obtaining battery status information corresponding to each of the multiple battery circuits, and determining a target battery circuit for which a control operation is to be performed based on the battery status information; wherein the battery status information includes a current battery voltage value and battery SOC information; According to the total working power and the battery status information corresponding to the target battery circuit, the allocated power corresponding to each target battery circuit is determined, and the target battery circuit is controlled to operate according to the allocated power.

2. The method for controlling a battery circuit in an energy storage inverter according to claim 1, wherein the step of determining the allocated power corresponding to each target battery circuit based on the total operating power and the battery status information corresponding to the target battery circuit comprises: When the total operating power is the total charging power, determining the corresponding allocated power of each target battery circuit during the charging operation according to the total charging power, the current battery voltage value indicated in the battery status information, the current battery SOC, and the maximum battery SOC; When the total operating power is the total discharge power, the corresponding allocated power of each target battery circuit in the discharge operation is determined according to the total discharge power, the current battery voltage value indicated in the battery status information, the current battery SOC, and the minimum battery SOC.

3. The method for controlling a battery circuit in an energy storage inverter according to claim 1 or 2, further comprising, after the step of determining the allocated power corresponding to each target battery circuit: Obtaining the power upper limit value corresponding to each of the target battery circuits, and determining whether the sum of the power upper limit values ​​corresponding to the target battery circuits is greater than or equal to the total operating power; If yes, redistribute the difference of the determined allocated power based on the power upper limit value corresponding to each target battery circuit to update the allocated power corresponding to each target battery circuit; If not, the power upper limit value corresponding to the target battery circuit is used as the allocated power corresponding to each target battery circuit.

4. The method for controlling a battery circuit in an energy storage inverter according to claim 3, wherein the step of redistributing the difference of the determined allocated power based on the power upper limit corresponding to each target battery circuit comprises: Determining the power difference corresponding to each target battery circuit based on the power upper limit value of each target battery circuit and the determined allocated power; The difference is redistributed to each of the target battery circuits according to the power upper limit value and the difference power, so as to update the allocated power corresponding to each of the target battery circuits.

5. The method for controlling a battery circuit in an energy storage inverter according to claim 3 or 4, wherein if the sum of the power upper limits of the target battery circuits is greater than the total operating power, the method further comprises: Obtaining a power lower limit value corresponding to each target battery circuit, and shutting down a target battery circuit whose allocated power is less than the power lower limit value, so as to update the target battery circuit; determining the allocated power corresponding to each updated target battery circuit according to the total operating power and the updated battery status information corresponding to the target battery circuit; The determined allocated power is redistributed by difference according to the power upper limit value corresponding to the updated target battery circuit, so as to update the allocated power corresponding to the updated target battery circuit.

6. The method for controlling a battery circuit in an energy storage inverter according to any one of claims 1 to 5, wherein the step of obtaining the total operating power corresponding to the multiple battery circuits in response to the startup of the energy storage inverter comprises: receiving a battery charging instruction or a battery discharging instruction in response to activation of the energy storage inverter; Based on the battery charging instructions, the charging configuration strategy, PV power generation and grid information are obtained to calculate the total charging power corresponding to the multiple battery circuits; or, Based on the battery discharge instruction, a discharge configuration strategy, user load information, and grid information are obtained, and a total discharge power corresponding to multiple battery circuits is calculated.

7. The method for controlling a battery circuit in an energy storage inverter according to any one of claims 1 to 6, wherein the battery status information further includes battery switch status information and battery temperature information, and after the steps of obtaining the battery status information corresponding to the multiple battery circuits and determining a target battery circuit to be controlled based on the battery status information, the method further includes: Based on the battery switch status information and the battery temperature information, it is determined whether to perform a wake-up operation or a heating operation on each target battery circuit. If so, a corresponding operation is performed to put the target battery circuit into an operating state.

8. A control system for a battery circuit in an energy storage inverter, the control system being connected to the energy storage inverter and multiple battery circuits, respectively, and configured to implement control operations on the battery circuits; the multiple battery circuits being connected in parallel to the DC bus of the energy storage inverter, the battery circuits comprising batteries and a DC conversion circuit connected in series; The control system includes an inverter control component and a battery circuit control component, wherein: The inverter control component is connected to the energy storage inverter and is configured to detect the operating status of the energy storage inverter and, when detecting that the energy storage inverter starts to operate, is configured to obtain the total operating power corresponding to the multiple battery circuits from the energy storage inverter; The battery control component is connected to multiple battery circuits respectively. When the inverter control component obtains the total working power, the battery control component is configured to obtain battery status information corresponding to the multiple battery circuits respectively, and determine the target battery circuit according to the battery status information; Then, the allocated power corresponding to each target battery circuit is determined based on the total operating power and the battery status information corresponding to the target battery circuit, and an instruction including the allocated power is sent to the corresponding target battery circuit so that the target battery circuit operates according to the allocated power; wherein the battery status information includes the current battery voltage value and battery SOC information.

9. An energy storage control system, comprising: A processor, and a memory storing a program, wherein the program comprises instructions which, when executed by the processor, cause the processor to perform the method according to any one of claims 1 to 7.

10. A non-transitory machine-readable medium storing computer instructions, wherein: The computer instructions are configured to cause the computer to perform the method according to any one of claims 1-7.

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