Determination Method of Energy Storage System, Determination System, Electronic Device, Storage Medium

Abstract

The present application provides a determination method, a determination system, an electronic device, and a storage medium for an energy storage system. The method includes: determining an initial number of battery containers that meet the battery capacity requirement according to the battery capacity requirement and the capacity parameters of the battery containers adapted to the energy storage battery system; determining the required demand for a DC-side energy storage converter to meet the battery capacity requirement according to the initial number and the number of battery devices in a single battery container; determining the required demand for an AC-side energy storage converter to meet the apparent power demand at the grid connection point according to the apparent power demand at the grid connection point and the output power of a single energy storage converter; adaptively determining the target number of energy storage converters and / or the target number of battery containers according to the difference between the demand for the DC-side energy storage converter and the demand for the AC-side energy storage converter. This method improves the configuration efficiency and configuration accuracy of the energy storage system.

Description

Technical Field

[0001] The present application relates to the technical field of energy storage, and in particular, to a method for determining an energy storage system, a determination system, an electronic device, and a storage medium. Background Art

[0002] With the booming development of the energy storage industry, the demand for energy storage systems is also increasing day by day. In an energy storage system, a PCS (Power Conversion System, abbreviated as PCS) is usually included for converting direct current to alternating current. Among them, the DC side of the PCS is used to connect to the energy storage battery system, and the AC side of the PCS is used to connect to the grid-connected device. In order to achieve the purposes of improving the energy transmission efficiency, the stability of the energy storage system, etc., the DC side and the AC side of the PCS need to be matched. That is, the coordination and adaptation between the energy storage battery system on the DC side and the grid equipment on the AC side in terms of electrical parameters, power flow, control strategy, etc. For example, the DC side voltage range of the PCS matches the voltage range of the energy storage battery system, the DC side current of the PCS matches the charge and discharge current of the energy storage battery system, the AC side voltage of the PCS matches the voltage requirement of the grid, the AC side current of the PCS matches the load current of the grid, etc. However, due to the complexity of the matching requirements, the configuration personnel often face problems of low efficiency and insufficient accuracy in actual operation. Summary of the Invention

[0003] The purpose of the embodiments of the present application is to provide a method for determining an energy storage system, a determination system, an electronic device, and a storage medium, so as to improve the configuration efficiency and configuration accuracy.

[0004] In a first aspect, an embodiment of the present application provides a method for determining an energy storage system. The energy storage system includes an energy storage converter. The DC side of the energy storage converter is used to connect to an energy storage battery system; the AC side of the energy storage converter is used to connect to a grid-connected device. The method includes: receiving the battery capacity requirement of the DC side and the apparent power requirement of the grid connection point on the AC side; determining an initial number of battery containers that meet the battery capacity requirement according to the battery capacity requirement and the capacity parameters of the battery containers adapted to the energy storage battery system; and determining the required number of energy storage converters on the DC side to be configured to meet the battery capacity requirement according to the initial number of the battery containers and the number of battery devices in a single battery container; determining the required number of energy storage converters on the AC side to be configured to meet the apparent power requirement of the grid connection point according to the apparent power requirement of the grid connection point on the AC side and the output power of a single energy storage converter; if the required number of energy storage converters on the DC side is not less than the required number of energy storage converters on the AC side, determining the required number of energy storage converters on the DC side as the target number of the energy storage converters and determining the initial number of the battery containers as the target number of the battery containers; if the required number of energy storage converters on the DC side is less than the required number of energy storage converters on the AC side, determining the required number of energy storage converters on the AC side as the target number of the energy storage converters; and determining the target number of the battery containers according to the required number of energy storage converters on the AC side and the number of the battery devices.

[0005] In this way, there is no need for configuration personnel to manually determine the relevant quantities to be configured, which improves the configuration efficiency, shortens the configuration time, and reduces the operation requirements for configuration personnel. In addition, the present application takes into account the battery capacity requirement on the DC side and the apparent power requirement of the grid connection point on the AC side, so that the accuracy of each obtained target quantity can be higher, thereby improving the configuration accuracy.

[0006] Furthermore, adaptive adjustment is performed according to the difference between the required number of energy storage converters on the DC side and the required number of energy storage converters on the AC side, so that the number of battery containers and the number of energy storage converters that simultaneously meet the battery capacity requirement and the apparent power requirement of the grid connection point can be obtained, improving the accuracy of each target quantity.

[0007] Optionally, determining an initial quantity of battery containers that meet the battery capacity requirement according to the battery capacity requirement and the capacity parameter of the battery container adapted to the energy storage battery system includes: determining the nominal capacity of the energy storage battery system in the Nth year according to the capacity parameter and the quantity of battery containers in the Nth year; determining the available capacity of the energy storage battery system in the Nth year according to the nominal capacity in the Nth year and the capacity attenuation parameter of the energy storage battery in the Nth year; if the available capacity in the Nth year does not meet the capacity requirement in the Nth year, increasing a preset quantity on the basis of the quantity in the Nth year to obtain the initial quantity. Here, considering the situation that the energy storage battery gradually decays during its use, combining the available capacity in the Nth year after decay and the capacity requirement in the Nth year, the quantity of battery containers can be adaptively determined, so that the energy storage battery system can continuously meet the capacity requirement.

[0008] Optionally, the capacity attenuation parameter includes one or more of the following: the depth of discharge of the energy storage battery, the cell conversion efficiency, the SOH, and the charge-discharge round-trip efficiency. In this way, it will not be caused that the available capacity of the energy storage battery system in the Nth year is insufficient due to the objectively existing situation that the capacity of the energy storage battery gradually decays during actual use, and the accuracy of the target quantity is improved to a certain extent.

[0009] Optionally, determining the required quantity of AC-side energy storage converters to meet the apparent power requirement at the grid connection point according to the apparent power requirement at the grid connection point on the AC side and the output power of a single energy storage converter includes: determining the output power of a single battery device according to the capacity parameter, the operating multiple of the battery container, and the quantity of the battery devices; determining a target energy storage converter with an output power greater than that of a single battery device; determining the apparent power requirement on the AC side of the target energy storage converter according to the apparent power requirement at the grid connection point and the power loss parameter; determining the required quantity of AC-side energy storage converters according to the apparent power requirement on the AC side and the output power of the target energy storage converter.

[0010] In this way, the stability and overall performance of the energy storage system are comprehensively considered, and the power loss during transmission is particularly concerned. In this way, the configured battery containers can enable the energy storage system to continuously maintain good performance, so as to continuously meet the actual power requirement on the AC side. In this way, the energy storage system can better adapt to the actual use scenario and can provide electric energy more efficiently and stably in the actual use scenario.

[0011] Optionally, the target energy storage converter whose determined output power is greater than the output power of a single battery device includes: determining the derated output power of the energy storage converter according to the environmental parameters of the environment where the energy storage converter is located and / or the performance parameters of the energy storage converter; determining the target energy storage converter whose derated output power is greater than the output power of a single battery device. In this way, the derated output power can reflect the maximum output power of the energy storage converter under its specific working environment and / or specific performance conditions. Therefore, screening out the target energy storage converter whose derated output power is greater than the output power of a single battery device can further improve the stability and overall performance of the energy storage system in its actual specific working scenario.

[0012] Optionally, before determining the target energy storage converter whose derated output power is greater than the output power of a single battery device, the target energy storage converter whose determined output power is greater than the output power of a single battery device further includes: determining candidate target energy storage converters whose rated output power is greater than the output power of a single battery device; where, from the candidate target energy storage converters, determining the target energy storage converter whose derated output power is greater than the output power of a single battery device. In this way, the number of energy storage converters for which the derated output power needs to be determined can be reduced, thereby effectively improving the determination efficiency of the target energy storage converter and also improving the configuration efficiency to a certain extent.

[0013] Optionally, the method further includes: obtaining the type parameter of the energy storage converter; determining the number of energy storage boost converter systems that match the type parameter of the energy storage converter according to the type parameter of the energy storage converter and the target number of the energy storage converter; at least one energy storage converter is included in the energy storage boost converter system; the type of the energy storage boost converter system is the same as the type of the energy storage converter; determining the configuration cost according to the obtained cost parameter of the energy storage boost converter system and the cost parameter of the battery container; determining a configuration plan that meets the preset requirements. In this way, a configuration plan with a lower configuration cost can be screened out, thereby saving the configuration cost.

[0014] Second aspect, an embodiment of the present application provides a determination system for an energy storage system. The energy storage system includes an energy storage converter. The DC side of the energy storage converter is used to connect to an energy storage battery system; the AC side of the energy storage converter is used to connect to a grid-connected device. The determination system includes: a receiving module, configured to receive the battery capacity requirement of the DC side and the apparent power requirement of the grid connection point of the AC side; a first determination module, configured to determine an initial number of battery containers that meet the battery capacity requirement according to the battery capacity requirement and the capacity parameters of the battery containers adapted to the energy storage battery system; and, determine the required number of energy storage converters on the DC side to be configured according to the initial number of battery containers and the number of battery devices in a single battery container; a second determination module, configured to determine the required number of energy storage converters on the AC side to be configured according to the apparent power requirement of the grid connection point of the AC side and the output power of a single energy storage converter; a third determination module, configured to, if the required number of energy storage converters on the DC side is not less than the required number of energy storage converters on the AC side, determine the required number of energy storage converters on the DC side as the target number of the energy storage converters, and determine the initial number of battery containers as the target number of the battery containers; if the required number of energy storage converters on the DC side is less than the required number of energy storage converters on the AC side, determine the required number of energy storage converters on the AC side as the target number of the energy storage converters; and determine the target number of the battery containers according to the required number of energy storage converters on the AC side and the number of battery devices.

[0015] In this way, it is not necessary for the configuration personnel to manually determine the relevant quantities to be configured, which improves the configuration efficiency, shortens the configuration duration, and reduces the operation requirements for the configuration personnel. In addition, the present application takes into account the battery capacity requirement on the DC side and the apparent power requirement of the grid connection point on the AC side, so that the accuracy of each obtained target quantity can be higher, thereby improving the configuration accuracy.

[0016] Third aspect, an embodiment of the present application provides an electronic device, including a processor and a memory. The memory stores computer-readable instructions, and when the computer-readable instructions are executed by the processor, the steps in the method provided in the first aspect above are run.

[0017] Fourth aspect, an embodiment of the present application provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps in the method provided in the first aspect above are run.

[0018] Fifth aspect, an embodiment of the present application provides a computer program product, which includes a computer program or instructions. When the computer program or instructions are executed by a processor, the method described in the first aspect is run.

[0019] Other features and advantages of the present application will be described in the subsequent specification, and in part will be obvious from the specification, or can be understood by implementing the embodiments of the present application. The objectives and other advantages of the present application can be realized and obtained by the structures specifically pointed out in the written specification, claims, and drawings. Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other relevant drawings can also be obtained based on these drawings.

[0021] Figure 1 It is a schematic structural diagram of an energy storage system provided by an embodiment of the present application;

[0022] Figure 2 It is a flowchart of a method for determining an energy storage system provided by an embodiment of the present application;

[0023] Figure 3 It is a structural block diagram of a system for determining an energy storage system provided by an embodiment of the present application;

[0024] Figure 4 It is a schematic structural diagram of an electronic device for executing a method for determining an energy storage system provided by an embodiment of the present application. Detailed Embodiments

[0025] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and illustrated in the drawings here can be arranged and designed in various different configurations. Therefore, the detailed description of the embodiments of the present application provided in the drawings below is not intended to limit the scope of the claimed present application, but only represents the selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts fall within the scope of protection of the present application.

[0026] It should be noted that: similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. At the same time, in the description of the present application, the terms "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0027] It should be noted that, without conflict, the embodiments in this application or the technical features in the embodiments can be combined.

[0028] In the related art, configurators often face problems of low efficiency and insufficient accuracy in actual operations; to solve this problem, this application provides a determination method, a determination system, an electronic device, and a storage medium for an energy storage system; among them, the energy storage system at least includes a power conversion system for energy storage (PCS), so that the number of battery containers required on the DC side can be determined according to the battery capacity requirements on the DC side of the PCS and related influencing factors; according to the power demand on the AC side of the PCS and related influencing factors, the number of power conversion systems for energy storage required can be determined, and then considering the number of battery containers required and the number of power conversion systems for energy storage required, a configuration scheme that can match both sides can be determined to improve the configuration efficiency and configuration accuracy.

[0029] Furthermore, the above determination method can be applied to a configuration device, and the configuration device can be, for example, a terminal device or a server device. Among them, the terminal device can include, for example, a laptop computer, a desktop computer, etc., and the server device can include, for example, a server, a server cluster, or a cloud platform, etc.

[0030] It should be noted that the defects existing in the above solutions in the related art are obtained by the inventor through long-term practice and careful research. Therefore, the process of discovering the above problems and the solutions proposed by the embodiments of the present invention below for the above problems should both be the contributions made by the inventor to the present invention during the process of the present invention.

[0031] It should be noted that the energy storage system includes a power conversion system for energy storage (PCS), the DC side of the power conversion system for energy storage is used to connect to an energy storage battery system; the AC side of the power conversion system for energy storage is used to connect to a grid-connected device.

[0032] Furthermore, the energy storage system can include one power conversion system for energy storage, or can include multiple power conversion systems for energy storage (that is, multiple PCSs), and multiple power conversion systems for energy storage can be integrated in one or more energy storage boost conversion systems existing in the energy storage system. It can be understood that in addition to mounting the power conversion system for energy storage, the energy storage boost conversion system can also include other devices, and these devices can include, for example, a medium-voltage transformer.

[0033] The above energy storage battery system can include one or more energy storage batteries, and multiple energy storage batteries can be assembled in a battery container. Among them, one battery cluster can be used as the assembly unit of the battery container, or one battery stack can be used as the assembly unit of the battery container, and this application does not limit this here.

[0034] The above grid-connected device refers to a device that connects a power device to the power grid for energy exchange. The power device here is also the above-mentioned energy storage battery system. The above grid-connected device may include, for example, a transformer, an inverter, etc.

[0035] Please refer to Figure 1 , which shows a schematic structural diagram of an energy storage system provided by an embodiment of the present application. As Figure 1 shown, taking the example that the energy storage system includes multiple energy storage converters, and the multiple energy storage converters are integrated in the energy storage boost conversion system (in addition to the mounted energy storage converters, it also includes a medium-voltage transformer), it can be seen that after the energy storage battery system outputs direct current, the direct current is transmitted to the energy storage boost conversion system through a low-voltage cable. The energy storage converter in the energy storage boost conversion system converts the direct current into alternating current, and then transmits it to the medium-voltage transformer in the energy storage boost conversion system through a low-voltage cable for boosting to obtain medium-voltage alternating current. Then, it is transmitted to the main transformer through a medium-voltage cable, the alternating current is boosted by the main transformer to obtain high-voltage alternating current, and then the high-voltage alternating current is transmitted to the grid connection point through a high-voltage cable and finally transmitted to the power grid to supply the grid-connected device.

[0036] It can be understood that the determination method provided by the embodiment of the present application can obtain the target number of battery containers and the target number of energy storage converters that match the DC side and the AC side of the above energy storage converter.

[0037] Please continue to refer to Figure 2 , which shows a flowchart of a determination method for an energy storage system provided by an embodiment of the present application. As Figure 2 shown, the determination method of the energy storage system includes the following steps 101 to step 106.

[0038] Step 101, receive the battery capacity requirement of the DC side and the apparent power requirement of the grid connection point on the AC side;

[0039] In some application scenarios, the above battery capacity requirement and / or the apparent power requirement of the grid connection point can be determined by the configuration personnel according to the requirements of the energy storage project.

[0040] Among them, the above battery capacity requirement can reflect the battery capacity required by the energy storage system. In some application scenarios, it may only include the battery capacity required currently. In other application scenarios, it may also include the battery capacity required in the Nth year, the Nth month, etc. The above N can be any value such as 1, 2, 3, 5, etc.

[0041] The above grid connection point apparent power demand can reflect the apparent power required by the grid connection point served by the energy storage system. Among them, the apparent power can reflect the capacity of the grid-connected equipment, which can specifically be the product of the effective value of the voltage and the effective value of the current, and its unit is volt-ampere (VA) or kilovolt-ampere (kVA). The grid connection point refers to the connection point where the energy storage system is connected to the power grid, such as Figure 1 the high-voltage power output terminal of the high-voltage cable in

[0042] It should be understood that the above battery capacity demand and the grid connection point apparent power demand can be included in the same instruction or in different instructions, so that when the device receives the instruction, it also receives the corresponding demand.

[0043] Step 102, according to the battery capacity demand and the capacity parameter of the battery container adapted to the energy storage battery system, determine the initial number of battery containers that meet the battery capacity demand;

[0044] The above capacity parameter of the battery container can reflect the total capacity of the energy storage batteries contained therein, usually expressed in kilowatt-hours (kWh) or megawatt-hours (MWh). For example, 3.44 MWh, 6000 kWh, etc.

[0045] In some application scenarios, for example, the quotient of the battery capacity required to be provided by the energy storage system and the capacity of a single battery container can be directly determined as the above initial number. In other application scenarios, for example, the attenuation factor of the energy storage battery during use can also be considered to determine the above initial number. It can be understood that if the specific numerical value determined is not an integer, it can be rounded up, and the nearest larger integer value can be determined as the initial number.

[0046] Step 103, according to the initial number of the battery containers and the number of battery devices in a single battery container, determine the demand for the DC side energy storage converter required to meet the battery capacity demand;

[0047] The above battery devices can be, for example, the above battery clusters or battery stacks. Among them, if the battery device is a battery cluster, the number of battery devices is specifically the number of battery clusters. Further, a battery cluster can be connected to an energy storage converter to implement a distributed structure of one cluster, one management. In addition, if the battery device is a battery stack, the number of battery devices is specifically the number of battery stacks, and a battery stack can be connected to an energy storage converter to implement a centralized structure of one stack, one management.

[0048] In some application scenarios, the configuration device can, for example, determine the demand for the DC side energy storage converter by multiplying the above initial number and the number of battery devices in a single battery container.

[0049] Step 104: Determine the required quantity of AC-side energy storage converters to meet the apparent power demand at the grid connection point based on the apparent power demand at the grid connection point on the AC side and the output power of a single energy storage converter.

[0050] It should be noted that an energy storage system usually needs to output a voltage that matches the voltage level required by the power grid to ensure the smooth transmission of electric energy. That is, the voltage level output by the energy storage system needs to match the voltage level required by the power grid (for example, if the power grid requires high-voltage electricity, the energy storage system needs to transmit high-voltage electricity to it). In the energy storage system, after adjusting the voltage level through multiple transformers, only the voltage level at the grid connection point matches the voltage level required by the power grid.

[0051] Based on this, this application considers determining the quantity of AC-side energy storage converters based on the apparent power demand at the grid connection point, including but not limited to the following reasons:

[0052] (1) The apparent power (S) at the grid connection point on the PCS AC side includes active power (P) and reactive power (Q), and the relationship among the three is: . By monitoring and controlling the apparent power at the grid connection point, the frequency of the power grid can be adjusted by regulating the active power, and the voltage of the power grid can be adjusted by regulating the reactive power, thereby ensuring the power quality.

[0053] (2) When the grid voltage is abnormal, such as voltage dip or rise, by controlling the apparent power, the PCS can achieve low-voltage ride-through and high-voltage ride-through, thereby maintaining the stable operation of the power grid.

[0054] (3) When the energy storage system discharges, if the apparent power at the grid connection point is too large, it may cause electric power to flow back into the power grid, resulting in a decline in power quality or electrical faults. By monitoring the apparent power at the grid connection point, the reverse current phenomenon can be effectively prevented.

[0055] (4) The monitoring and control of apparent power can help optimize the charge and discharge strategies of the energy storage system. For example, by dynamically adjusting the output of active power and reactive power according to the needs of the power grid and the state of the energy storage system, the operating efficiency of the energy storage system can be improved.

[0056] (5) The apparent power at the grid connection point is directly related to the safe operation of the PCS and grid equipment. If the apparent power exceeds the rated value of the equipment, it may cause the equipment to be overloaded, damaged, or even lead to safety accidents.

[0057] (6) Many power grids have strict power requirements for the access of energy storage systems, including the magnitude of apparent power and the power factor range. By controlling the apparent power at the grid connection point, the energy storage system can better meet the grid access standards.

[0058] Therefore, considering the above-mentioned reasons, the present application determines the demand for the energy storage converter on the AC side according to the apparent power demand at the grid connection point on the AC side and the output power of a single energy storage converter.

[0059] In some application scenarios, for example, the required apparent power at the grid connection point can be divided by the output power of a single energy storage converter to obtain the demand for the energy storage converter on the AC side. In other application scenarios, for example, other relevant factors affecting the output power of the energy storage converter (such as the environment where the energy storage converter is located, line loss during power transmission, etc.) can also be considered to determine the demand for the energy storage converter on the AC side.

[0060] Then, the configuration device can determine the target number of energy storage converters and / or the target number of the battery containers according to the demand for the energy storage converter on the DC side and the demand for the energy storage converter on the AC side.

[0061] In some application scenarios, the configuration device can determine the difference between the demand for the energy storage converter on the DC side and the demand for the energy storage converter on the AC side, and then adaptively adjust the two according to the difference, so as to obtain the number of battery containers and the number of energy storage converters that can simultaneously meet the battery capacity demand and the apparent power demand at the grid connection point, so as to improve the accuracy of each target number. Thus, the configuration device can further perform the following steps:

[0062] Step 105, if the demand for the energy storage converter on the DC side is not less than the demand for the energy storage converter on the AC side, then determine the demand for the energy storage converter on the DC side as the target number of energy storage converters, and determine the initial number of the battery containers as the target number of the battery containers;

[0063] That is to say, when the demand for the energy storage converter on the DC side is greater than the demand for the energy storage converter on the AC side, it means that although the demand for the energy storage converter on the AC side can meet the apparent power demand at the grid connection point, this demand cannot meet the connection requirements of the energy storage battery system (such as the requirements of one-cluster-one-management or one-stack-one-management). Therefore, in order to meet this connection requirement, the demand for the energy storage converter on the DC side can be determined as the target number of energy storage converters. In this way, after determining the target number of energy storage converters, it can meet the battery capacity demand on the DC side, the apparent power demand on the AC side, and the above-mentioned connection requirements.

[0064] In addition, when the demand for the DC-side energy storage converter is equal to the demand for the AC-side energy storage converter, it means that the demand for the AC-side energy storage converter can just meet the connection demand on the DC side. Therefore, the demand for the DC-side energy storage converter can also be determined as the target number of energy storage converters. In this way, after determining the target number of energy storage converters, the battery capacity demand on the DC side and the grid connection apparent power demand on the AC side can also be met.

[0065] It can be understood that when the demand for the DC-side energy storage converter is determined as the target number of energy storage converters, the target number to be configured for the battery container is also the above-mentioned initial number of the demand for the DC-side energy storage converter determined currently.

[0066] Step 106, if the demand for the DC-side energy storage converter is less than the demand for the AC-side energy storage converter, then determine the demand for the AC-side energy storage converter as the target number of energy storage converters; and, determine the target number of battery containers according to the demand for the AC-side energy storage converter and the number of battery devices.

[0067] That is to say, when the demand for the DC-side energy storage converter is less than the demand for the AC-side energy storage converter, it means that the demand for the DC-side energy storage converter is relatively small. At this time, the initial number of battery containers is also relatively small, which is not enough to meet the grid connection apparent power demand on the AC side. Since the demand for the AC-side energy storage converter is the minimum number of energy storage converters determined based on this grid connection apparent power demand, therefore, at this time, the demand for the AC-side energy storage converter can be determined as the target number of energy storage converters. And, the target number of battery containers can be re-determined based on the target number of energy storage converters.

[0068] In some application scenarios, for example, the quotient of the target number of energy storage converters and the number of battery devices in a single battery container can be determined as the target number of battery containers. Here, it can be understood that if the quotient value is not an integer, it can be rounded up.

[0069] In this implementation manner, the target number of energy storage converters and the target number of battery containers that can simultaneously meet the battery capacity demand on the DC side and the grid connection apparent power demand on the AC side can be obtained. In this way, it is not necessary for the configuration personnel to manually determine the relevant numbers to be configured, which improves the configuration efficiency, shortens the configuration duration, and reduces the operation requirements for the configuration personnel. In addition, this application takes into account the battery capacity demand on the DC side and the grid connection apparent power demand on the AC side, so that the accuracy of each obtained target number can be higher, thereby improving the configuration accuracy.

[0070] In some alternative implementation manners, determining the initial quantity of battery containers that meet the battery capacity requirement according to the battery capacity requirement and the capacity parameter of the battery container adapted to the energy storage battery system in step 102 above includes:

[0071] Sub-step 1021: Determine the nominal capacity of the energy storage battery system in the Nth year according to the capacity parameter and the quantity of battery containers in the Nth year.

[0072] For example, the product of the capacity of a single energy storage battery and the quantity of battery containers in the Nth year can be determined as the nominal capacity of the energy storage battery system in that year.

[0073] Sub-step 1022: Determine the available capacity of the energy storage battery system in the Nth year according to the nominal capacity in the Nth year and the capacity attenuation parameter of the energy storage battery in the Nth year.

[0074] The above-mentioned capacity attenuation parameter can be regarded as the parameter corresponding to the relevant factors that cause the capacity attenuation of the energy storage battery.

[0075] In some alternative implementation manners, the capacity attenuation parameter includes one or more of the following: the depth of discharge of the energy storage battery, the cell conversion efficiency, the SOH, and the charge-discharge round-trip efficiency.

[0076] Among them, the depth of discharge (abbreviated as DoD) represents the percentage of the discharge amount of the energy storage battery to its rated capacity.

[0077] The cell conversion efficiency represents the ratio of the actual output energy to the input energy of the cell of the energy storage battery during the charge-discharge process, and is used to measure the energy loss of the cell during the energy storage and release process.

[0078] The above-mentioned SOH (State of Health, abbreviated as SOH) represents the health state of the energy storage battery.

[0079] The above-mentioned charge-discharge round-trip efficiency (abbreviated as RTE) represents the ratio of the output energy to the input energy of the energy storage battery in a complete charge-discharge cycle, and is used to measure the efficiency of the energy storage battery in the energy conversion process.

[0080] In some application scenarios, the configuration device can multiply the above-mentioned nominal capacity in the Nth year by the DOD, cell conversion efficiency, SOH, and / or RTE of the energy storage battery in the Nth year respectively, so as to obtain the corresponding available capacity of the energy storage battery system in the Nth year.

[0081] Specifically, if only one capacity attenuation parameter is considered, the nominal capacity in the Nth year can be multiplied by the corresponding capacity attenuation parameter of the energy storage battery in the Nth year, and the product obtained is the corresponding available capacity of the energy storage battery system in the Nth year. For example, the configuration device can use the nominal capacity in the Nth year and multiply it by the DOD of the energy storage battery in the Nth year, and the product obtained is the corresponding available capacity of the energy storage battery system in the Nth year . That is, . Or, multiply the nominal capacity in the Nth year by the cell conversion efficiency of the energy storage battery in the Nth year , and the product obtained is the corresponding available capacity of the energy storage battery system in the Nth year . That is, .

[0082] In addition, if multiple capacity attenuation parameters are considered, the nominal capacity in the Nth year can be multiplied by multiple capacity attenuation parameters of the energy storage battery in the Nth year, and the product obtained is the corresponding available capacity of the energy storage battery system in the Nth year. For example, if the DOD, cell conversion efficiency , SOH, and RTE in the Nth year are involved at the same time, the corresponding available capacity of the energy storage battery system in the Nth year is equal to the product of the nominal capacity in the Nth year and the DOD, cell conversion efficiency , SOH, and RTE in the Nth year. That is, .

[0083] In this way, the configuration device can determine the available capacity of the energy storage battery system in the Nth year through the above one or more capacity attenuation parameters of the energy storage battery in the Nth year, so that the determined available capacity is closer to the actual capacity in the Nth year. Subsequently, it will not lead to insufficient available capacity of the energy storage battery system in the Nth year due to the objective fact that the capacity of the energy storage battery gradually decays during actual use, and the accuracy of the target quantity is improved to a certain extent.

[0084] Sub-step 1023, if the available capacity in the Nth year does not meet the capacity requirement in the Nth year, then add a preset quantity to the quantity in the Nth year to obtain the initial quantity;

[0085] The above preset quantity can be, for example, 1, 2, etc.

[0086] It can be understood that during the continuous use of the energy storage battery, the capacity often decays. Therefore, if the available capacity determined in the Nth year cannot meet the capacity requirement in the Nth year, more battery containers can be added to the energy storage battery system, and the quantity after addition is the above initial quantity.

[0087] Sub-step 1024: If the available capacity in the Nth year meets the capacity requirement in the Nth year, then determine the quantity in the Nth year as the initial quantity.

[0088] It can be understood that when configuring the device to determine the quantity of battery containers in the Nth year, for example, the estimated quantity of battery containers can be first determined according to the battery capacity requirement and the capacity of a single battery container (such as by division). Then, on the basis of this estimated quantity, the preset quantity is gradually increased to obtain the quantity in the Nth year.

[0089] For example, if the available capacity in the first year does not meet the capacity requirement in the first year, 1 can be added to the estimated quantity, and then the available capacities in the 0th year, the 1st year, the 2nd year... the Nth year are re-determined. If the available capacity in the first year meets the capacity requirement in the first year, the quantity obtained currently can be determined as the initial quantity. If the available capacity in the second year does not meet the capacity requirement in the second year, 1 can be added on the basis of the initial quantity obtained currently (such as the initial quantity obtained in the first year), and then the available capacities in the 1st year, the 2nd year... the Nth year are re-determined. If the available capacity in the second year meets the capacity requirement in the second year, the quantity obtained currently can be determined as the initial quantity. And so on, the required available capacity in the Nth year is gradually determined, and then according to the relationship between the available capacity in the Nth year and the capacity requirement in the Nth year, the initial quantity in the Nth year can be obtained.

[0090] It should be clear that the above sub-steps 1021 to 1024 are a loop process, aiming to obtain the initial quantity that meets the battery capacity requirement of the current year.

[0091] In this implementation, considering the situation that the energy storage battery will gradually decay during its use, the quantity of battery containers can be adaptively determined by combining the available capacity in the Nth year after decay and the capacity requirement in the Nth year, so that the energy storage battery system can continuously meet the capacity requirement.

[0092] It can be understood that in terms of time division, in addition to dividing by year to obtain the initial quantity of battery containers in the current year, it can also be divided by month or day to obtain the initial quantity of battery containers in different time periods.

[0093] In some optional implementation manners, the determining the required quantity of AC-side energy storage converters to meet the apparent power requirement at the grid connection point according to the apparent power requirement at the grid connection point on the AC side and the output power of a single energy storage converter in step 104 above includes:

[0094] Sub-step 1041: Determine the output power of a single battery device according to the capacity parameter, operation multiple of the battery container, and the quantity of the battery devices.

[0095] The operating rate of the above energy storage battery, i.e., the charge-discharge rate of the energy storage battery during actual operation.

[0096] In some application scenarios, the capacity of a single battery container is multiplied by its operating rate to obtain the charge-discharge power of the battery container at this operating rate, and then the charge-discharge power of the battery container at this operating rate is divided by the number of battery devices therein to obtain the output power of a single battery device . That is, .

[0097] Sub-step 1042: Determine the target energy storage converter whose output power is greater than the output power of a single battery device;

[0098] The above output power may include, for example, rated output power, actual output power, etc.

[0099] In this way, since the connection mode formed between the energy storage converter and the energy storage battery system is one-cluster-one management or one-stack-one management, the output power of the energy storage converter should match the output power of a single battery cluster or a single battery stack.

[0100] Furthermore, during the charge and discharge process of the battery cluster or battery stack, instantaneous power fluctuations or peak power demands may occur. If the output power of the energy storage converter is less than its output power, it may cause the battery cluster or battery stack not to reach the maximum charge-discharge power when needed, thus affecting the performance of the energy storage system.

[0101] In addition, the working conditions of the battery cluster or battery stack may change, and the energy storage converter needs to adapt to the power demands under different working conditions to enable the energy storage system to operate stably. For example, when the SOH or SOC (state of charge) of the battery cluster or battery stack changes, resulting in a change in its working conditions, the energy storage converter needs to adapt to the power demands under the current working conditions.

[0102] In addition, since the output power of the battery cluster or battery stack needs to be converted and regulated by the energy storage converter. If the output power of the energy storage converter is less than the output power of the battery cluster or battery stack, it may cause a power bottleneck, thus limiting the overall performance of the energy storage system.

[0103] Therefore, this implementation method can improve the above situation by determining the target energy storage converter whose output power is greater than the output power of a single battery device.

[0104] Sub-step 1043: Determine the apparent power demand on the AC side of the target energy storage converter according to the grid connection apparent power demand and the power loss parameter;

[0105] The above power loss parameters can be regarded as the parameters corresponding to the relevant factors affecting the apparent power at the grid connection point. For example, in Figure 1 the energy storage system shown, the power loss parameters may include, for example, one or more of the following: the efficiency of the power conversion system (PCS), low-voltage AC line loss, medium-voltage transformer efficiency, medium-voltage AC line loss, main transformer efficiency, and high-voltage AC line loss. Among them, the PCS efficiency reflects the power loss when the PCS converts direct current into alternating current, the medium-voltage transformer efficiency reflects the power loss during the voltage transformation of the medium-voltage transformer, the main transformer efficiency reflects the power loss during the voltage transformation of the main transformer, and the line loss reflects the power loss caused by cable transmission.

[0106] In some application scenarios, for example, one or more power loss parameters can be multiplied, and then the quotient of the apparent power demand value at the grid connection point and the product of the power loss parameters can be calculated to determine the actual apparent power required on the AC side, which is also the apparent power demand corresponding to the above AC side.

[0107] Sub-step 1044: Determine the demand for the AC side energy storage converter according to the apparent power demand on the AC side and the output power of the target energy storage converter.

[0108] For example, the quotient of the apparent power demand value on the AC side and the output power of a single target energy storage converter can be calculated to obtain the demand for the AC side energy storage converter.

[0109] In this implementation, the stability and overall performance of the energy storage system are comprehensively considered, and special attention is paid to the power loss during the transmission process. This can enable the configured battery container to maintain good performance of the energy storage system continuously, so as to continuously meet the actual power demand on the AC side. In this way, the energy storage system can better adapt to the actual use scenario and provide electric energy more efficiently and stably in the actual use scenario.

[0110] In some application scenarios, the influence of the environment where the energy storage converter is located and its own performance on the configuration of the energy storage converter / battery container can be further considered. Therefore, in some alternative implementations, the determination of the target energy storage converter with an output power greater than that of a single battery device in the above sub-step 1042 includes:

[0111] First, determine the derated output power of the energy storage converter according to the environmental parameters of the environment where the energy storage converter is located and / or the performance parameters of the energy storage converter;

[0112] The above derated output power is also the maximum output power that the energy storage converter can achieve under specific environments and / or specific performances. The above specific environment is characterized by environmental parameters, and the above specific performance is characterized by performance parameters.

[0113] It is understandable that the output power after derating of the energy storage converter varies under different working environments. For example, when working at different altitudes and / or different temperatures, the power loss of the energy storage converter is different, so the output power after derating is also different. Subsequently, the output power of the energy storage converter under the actual working environment can be determined in combination with the environment where the energy storage converter is located, and this output power is also the above-mentioned output power after derating. Further, for example, the environmental derating factor corresponding to the environmental parameters can be obtained in advance, and the power loss of the energy storage converter in this environment is characterized by this environmental derating factor. For example, the altitude derating factor of the energy storage converter at an altitude of 2000 meters can be obtained in advance as 1, and the altitude derating factor at an altitude of 2100 meters is 0.98. Then, when the energy storage converter works at different altitudes, its output power after derating can be the product of the rated output power of the energy storage converter and the corresponding altitude derating factor. Another example is that the temperature derating factor of the energy storage converter when working at a temperature of 40°C can be obtained in advance as 1, and the temperature derating factor when working at a temperature of 50°C is 0.98. Then, when the energy storage converter works at different temperatures, its output power after derating can be the product of the rated output power of the energy storage converter and the corresponding temperature derating factor.

[0114] Similarly, due to different performances of the energy storage converter, the power will be lost to varying degrees. For example, under different working voltages or different conversion efficiencies, the rated output power will be lost to different degrees. Therefore, the output power of the energy storage converter during actual operation can also be determined in combination with the performance of the energy storage converter itself, and this output power is also the above-mentioned output power after derating. Further, for example, the performance derating factor corresponding to the performance parameters can be obtained in advance, and the power loss of the energy storage converter under the current performance is characterized by this performance derating factor. For example, the voltage derating factor of the energy storage converter when working with a DC voltage of (1000 - 1500) V can be obtained in advance as 1, and the voltage derating factor when working with a DC voltage of (1500 - 2500) V is 0.98. Then, when the energy storage converter works at different working voltages, its output power after derating can be the product of the rated output power of the energy storage converter and the corresponding voltage derating factor.

[0115] It is understandable that if both environmental parameters and performance parameters are considered, the rated output power of the energy storage converter can be multiplied by the corresponding derating factor to obtain the output power after derating. For example, multiply the rated output power of the energy storage converter by a temperature derating factor of 0.98 and a voltage derating factor of 0.98 to obtain the output power after derating.

[0116] Then, determine the target energy storage converter whose output power after derating is greater than the output power of a single battery device.

[0117] In this implementation, the output power after derating can reflect the maximum output power of the energy storage converter under its specific working environment and / or specific performance conditions. Therefore, screening out the target energy storage converter with an output power after derating greater than that of a single battery device can further improve the stability and overall performance of the energy storage system in its actual specific working scenario.

[0118] In some application scenarios, since the output power after derating needs to consider environmental parameters and / or performance parameters, the determination efficiency of the target energy storage converter may be low. Therefore, in order to improve the determination efficiency of the target energy storage converter, a preliminary screening of the energy storage converter can be performed before screening by the output power before derating. That is, first determine the candidate target energy storage converters with a rated output power greater than that of a single battery device; then, from the candidate target energy storage converters, determine the target energy storage converter with an output power after derating greater than that of a single battery device.

[0119] In this implementation, candidate target energy storage converters can be first screened out by the rated output power, and then a second-round screening can be performed from the candidate target energy storage converters using the output power after derating. In this way, the number of energy storage converters for which the output power after derating needs to be determined can be reduced, thereby effectively improving the determination efficiency of the target energy storage converter and also improving the configuration efficiency to a certain extent.

[0120] In some application scenarios, multiple energy storage converters can be integrated into an energy storage step-up and conversion system for easy management and transportation. Therefore, in some alternative implementations, after the above step 105 or step 106, the method further includes:

[0121] First, obtain the type parameter of the energy storage converter;

[0122] In some application scenarios, the type parameter of the energy storage converter can be characterized, for example, by the rated output power of the energy storage converter. That is, energy storage converters with the same rated output power can be determined as one type of energy storage converter. Then, in these application scenarios, when obtaining the type parameter of the energy storage converter, it can be regarded as obtaining its rated output power.

[0123] In some other application scenarios, the type parameter of the energy storage converter can also be characterized, for example, by other parameters of the energy storage converter, so that energy storage converters with the same parameters can be determined as one type of energy storage converter. These parameters can also be, for example, the voltage at the grid connection point.

[0124] Then, according to the type parameters of the energy storage converter and the target quantity of the energy storage converter, determine the quantity of the energy storage step-up conversion system that matches the type parameters of the energy storage converter; at least one energy storage converter is included in the energy storage step-up conversion system; the type of the energy storage step-up conversion system is the same as that of the energy storage converter;

[0125] That is to say, one or more energy storage converters of the same type can be mounted in the energy storage step-up conversion system. Therefore, the energy storage converters can be divided according to the type parameters, and then the quantity of the energy storage step-up conversion system can be determined according to the target quantities of different types of energy storage converters.

[0126] For example, for any type of energy storage step-up conversion system, determine the number of battery containers that can be connected by a single energy storage step-up conversion system of this type. Here, for example, the total number of energy storage converters that can be mounted at most in a single energy storage step-up conversion system of this type can be obtained and the quantity of battery devices in a single battery container that can be connected , and then divide the two to obtain the number of battery containers . That is, . Here, if the quotient is not an integer, it can be rounded down to obtain an integer quotient.

[0127] Then, the total number of fully loaded energy storage step-up conversion systems can be determined. Here, for example, according to the target quantity of the energy storage converters of the same type and the total number of energy storage converters that can be mounted at most in a single energy storage step-up conversion system , determine the total number of fully loaded energy storage step-up conversion systems . For example, . Here, if the quotient is not an integer, it can also be rounded down to obtain an integer quotient. It should be noted that if at most A energy storage converters can be mounted in the energy storage step-up conversion system, and A energy storage converters are mounted in this energy storage step-up conversion system, it can be determined that this energy storage step-up conversion system is fully loaded, otherwise it is determined that this energy storage step-up conversion system is not fully loaded. Here, the value of A can be 2, 3, or 4, etc.

[0128] Then, the total number of battery containers that can be connected by the fully loaded energy storage step-up conversion systems can be determined. Here, for example, multiply the total number of the fully loaded energy storage step-up conversion systems by the number of battery containers that can be connected by a single energy storage step-up conversion system to obtain the total number of battery containers that can be connected by the fully loaded energy storage step-up conversion systems . That is, .

[0129] Then, the number of under-loaded energy storage boost converters systems can be determined. Here, for example, the target number of energy storage converters of the same type is subtracted from the number of already-mounted energy storage converters, and then the difference is divided by the total number of energy storage converters that can be mounted at most in a single energy storage boost converter system to obtain the number of under-loaded energy storage boost converter systems . That is, . Here, if the quotient is not an integer, it can be rounded up to obtain an integer quotient.

[0130] Then, the total number of battery containers that can be connected by the under-loaded energy storage boost converter systems can be determined. Here, for example, the target number of battery containers is subtracted from the total number of battery containers that can be connected by the fully-loaded energy storage boost converter systems to obtain the total number of battery containers that can be connected by the under-loaded energy storage boost converter systems . That is .

[0131] In summary, that is, the required number of each type of energy storage boost converter system and the corresponding required number of battery containers are determined. It can be understood that the relevant parameters of the battery containers that can be mounted by different types of energy storage boost converter systems may be the same or different. Therefore, the costs of different types of energy storage boost converter systems may be different, and the costs of the corresponding battery containers may also be different.

[0132] Therefore, the configuration cost can be determined according to the obtained cost parameters of the energy storage boost converter system and the cost parameters of the battery container; that is, for each type of energy storage boost converter system, the cost of this type of energy storage boost converter system and the cost of the corresponding connected battery container can be determined to obtain the total cost of each type of energy storage boost converter system and the battery container it connects. This total cost is the above-mentioned configuration cost.

[0133] Then, a configuration plan that meets the preset requirements for the configuration cost can be determined.

[0134] The above-mentioned preset requirements can include, for example, the lowest configuration cost, the configuration cost being greater than a certain cost threshold, etc.

[0135] In this implementation, configuration plans with lower configuration costs can be screened out, thereby saving the configuration cost.

[0136] Those skilled in the art can understand that in the above method of the specific embodiment, the writing order of each step does not mean a strict execution order and does not constitute any limitation to the implementation process. The specific execution order of each step should be determined according to its function and possible internal logic.

[0137] Please refer to Figure 3 , which shows a structural block diagram of a determination system for an energy storage system provided by an embodiment of the present application. The determination system of the energy storage system may be a module, a program segment or code on an electronic device. It should be understood that this determination system corresponds to the above Figure 2 method embodiment and is capable of executing Figure 2 each step involved in the method embodiment.

[0138] Optionally, the determination system of the above energy storage system includes a receiving module 301, a first determination module 302, a second determination module 303, and a third determination module 304. Among them, the receiving module 301 is used to receive the battery capacity demand on the DC side and the apparent power demand at the grid connection point on the AC side; the first determination module 302 is used to determine the initial number of battery containers that meet the battery capacity demand according to the battery capacity demand and the capacity parameters of the battery container adapted to the energy storage battery system; and, according to the initial number of battery containers and the number of battery devices in a single battery container, determine the required number of energy storage converters on the DC side to meet the battery capacity demand; the second determination module 303 is used to determine the required number of energy storage converters on the AC side to meet the apparent power demand at the grid connection point according to the apparent power demand on the AC side and the output power of a single energy storage converter; the third determination module 304 is used to, if the required number of energy storage converters on the DC side is not less than the required number of energy storage converters on the AC side, determine the required number of energy storage converters on the DC side as the target number of the energy storage converter, and determine the initial number of battery containers as the target number of the battery container; if the required number of energy storage converters on the DC side is less than the required number of energy storage converters on the AC side, determine the required number of energy storage converters on the AC side as the target number of the energy storage converter; and determine the target number of the battery container according to the required number of energy storage converters on the AC side and the number of battery devices.

[0139] Optionally, the first determination module 302 is further used to: determine the nominal capacity of the energy storage battery system in the Nth year according to the capacity parameter and the number of battery containers in the Nth year; determine the available capacity of the energy storage battery system in the Nth year according to the nominal capacity in the Nth year and the capacity attenuation parameter of the energy storage battery in the Nth year; if the available capacity in the Nth year does not meet the capacity demand in the Nth year, increase the preset number on the basis of the number in the Nth year to obtain the initial number.

[0140] Optionally, the capacity attenuation parameter includes one or more of the following: the depth of discharge of the energy storage battery, the cell conversion efficiency, the SOH, and the charge and discharge round-trip efficiency.

[0141] Optionally, the second determination module 303 is further configured to: determine the output power of a single battery device according to the capacity parameter, the operating rate of the battery container, and the number of battery devices; determine a target energy storage converter whose output power is greater than that of a single battery device; determine the apparent power demand on the AC side of the target energy storage converter according to the grid connection point apparent power demand and the power loss parameter; and determine the demand for the AC side energy storage converter according to the apparent power demand on the AC side and the output power of the target energy storage converter.

[0142] Optionally, the second determination module 303 is further configured to: determine the derated output power of the energy storage converter according to the environmental parameter of the environment where the energy storage converter is located and / or the performance parameter of the energy storage converter; and determine a target energy storage converter whose derated output power is greater than that of a single battery device.

[0143] Optionally, the second determination module 303 is further configured to: before determining the target energy storage converter whose derated output power is greater than that of a single battery device, determine a candidate target energy storage converter whose rated output power is greater than that of a single battery device; and determine, from the candidate target energy storage converters, a target energy storage converter whose derated output power is greater than that of a single battery device.

[0144] Optionally, the system further includes a cost determination module, configured to: obtain the type parameter of the energy storage converter; determine the number of energy storage boost conversion systems that match the type parameter of the energy storage converter according to the type parameter of the energy storage converter and the target number of the energy storage converters; at least one energy storage converter is included in the energy storage boost conversion system; the type of the energy storage boost conversion system is the same as the type of the energy storage converter; determine the configuration cost according to the obtained cost parameter of the energy storage boost conversion system and the cost parameter of the battery container; and determine a configuration plan that satisfies a preset requirement.

[0145] It can be understood that, for the convenience of data management and use, the above determination system can also set multiple databases to store different data respectively. For example, the following databases can be set:

[0146] A cost database, configured to store the cost data of different types of energy storage converters and / or energy storage boost conversion systems, and the cost data of different types of battery containers.

[0147] An energy storage battery database, configured to store the relevant data of the battery, such as storing SOH, RTE, etc.

[0148] The battery container database is used to store relevant data of battery containers, such as capacity parameters, output power, DC voltage range, number of battery clusters, number of battery stacks, cell conversion efficiency, operating multiple, etc. of a single battery container.

[0149] The PCS database is used to store relevant parameters of different types of energy storage converters. For example, the rated output power of the energy storage converter, altitude derating factor, temperature derating factor, voltage derating factor, PCS efficiency, type of energy storage boost conversion system, number of energy storage converters that the energy storage boost conversion system can mount, etc.

[0150] The AC side database is used to store line losses corresponding to different cables, efficiency losses corresponding to different transformers, etc. For example, low-voltage DC line loss, low-voltage AC line loss, medium-voltage transformer efficiency, medium-voltage AC line loss, main transformer efficiency, high-voltage AC line loss, etc.

[0151] It should be noted that those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working process of the above-described system can refer to the corresponding process in the foregoing method embodiments and will not be repeated here.

[0152] Please refer to Figure 4 , Figure 4 FIG. is a schematic structural diagram of an electronic device for implementing the determination method of an energy storage system provided by an embodiment of the present application. The electronic device may include: at least one processor 401, such as a CPU, at least one communication interface 402, at least one memory 403, and at least one communication bus 404. Among them, the communication bus 404 is used to realize the direct connection communication of these components. Among them, the communication interface 402 of the device in the embodiment of the present application is used to communicate with other node devices for signaling or data. The memory 403 may be a high-speed RAM memory or a non-volatile memory, such as at least one disk memory. Optionally, the memory 403 may also be at least one storage device located far from the foregoing processor. The memory 403 stores computer-readable instructions. When the computer-readable instructions are executed by the processor 401, the electronic device can execute the methods provided by the foregoing method embodiments.

[0153] It can be understood that Figure 4 the structure shown is only schematic, and the electronic device may further include more or fewer components than those shown in Figure 4 , or have a different configuration from that shown in Figure 4 . Figure 4 Each component shown in can be implemented by hardware, software, or a combination thereof.

[0154] An embodiment of the present application provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the methods provided in the foregoing method embodiments can be executed.

[0155] An embodiment of the present application provides a computer program product. The computer program product includes a computer program stored on a non-transitory computer-readable storage medium. The computer program includes program instructions. When the program instructions are executed by a computer, the computer can execute the methods provided in the foregoing method embodiments.

[0156] In the embodiments provided in the present application, it should be understood that the disclosed systems and methods can be implemented in other ways. The system embodiments described above are merely illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For another example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed couplings or direct couplings or communication connections to each other can be through some communication interfaces. The indirect couplings or communication connections of the devices or units can be in electrical, mechanical or other forms.

[0157] In addition, the units described as separate components may or may not be physically separated. The components displayed as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0158] Furthermore, the functional modules in the various embodiments of the present application can be integrated together to form an independent part, or each module can exist alone, or two or more modules can be integrated to form an independent part.

[0159] In this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations.

[0160] The above are only the embodiments of the present application and are not used to limit the protection scope of the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for determining an energy storage system, characterized in that: The energy storage system includes an energy storage converter, and the DC side of the energy storage converter is used to connect to the energy storage battery system; The AC side of the energy storage converter is used to connect to a grid-connected device; the method comprises: Receiving the battery capacity requirement of the DC side and the apparent power requirement of the grid connection point of the AC side; Determining an initial number of battery containers that meet the battery capacity requirement based on the battery capacity requirement and the capacity parameters of the battery containers adapted to the energy storage battery system; and Determine the required number of DC-side energy storage converters required to meet the battery capacity requirement according to the initial number of the battery containers and the number of battery devices in a single battery container; Determine the required number of AC-side energy storage converters required to meet the apparent power demand of the grid connection point according to the apparent power demand of the AC-side grid connection point and the output power of a single energy storage converter; If the demand for the DC side energy storage converter is not less than the demand for the AC side energy storage converter, the demand for the DC side energy storage converter is determined as the target quantity of the energy storage converter, and the initial quantity of the battery containers is determined as the target quantity of the battery containers; If the demand for the DC side energy storage converter is less than the demand for the AC side energy storage converter, the demand for the AC side energy storage converter is determined as the target quantity of the energy storage converter; The target number of the battery containers is determined according to the demand for the AC side energy storage converter and the number of the battery devices.

2. The method according to claim 1, characterized in that The determining, according to the battery capacity requirement and the capacity parameters of the battery container adapted to the energy storage battery system, the initial number of battery containers that meet the battery capacity requirement includes: Determine the nominal capacity of the energy storage battery system in year N according to the capacity parameters and the number of battery containers in year N; Determine the available capacity of the energy storage battery system in the Nth year according to the nominal capacity in the Nth year and the capacity decay parameter of the energy storage battery in the Nth year; If the available capacity in the Nth year does not meet the capacity requirement in the Nth year, a preset quantity is added to the quantity in the Nth year to obtain the initial quantity.

3. The method according to claim 2, characterized in that The capacity decay parameters include one or more of the following: discharge depth, cell conversion efficiency, SOH, and charge-discharge round-trip efficiency of the energy storage battery.

4. The method according to any one of claims 1 to 3, characterized in that: The step of determining the required amount of AC side energy storage converters required to meet the apparent power demand of the grid connection point according to the apparent power demand of the AC side grid connection point and the output power of a single energy storage converter comprises: Determine the output power of a single battery device according to the capacity parameters of the battery container, the operating multiple and the number of the battery devices; Determine a target energy storage converter having an output power greater than an output power of a single battery device; Determining the AC side apparent power demand of the target energy storage converter according to the apparent power demand of the grid connection point and the power loss parameter; The AC side energy storage converter requirement is determined according to the AC side apparent power requirement and the output power of the target energy storage converter.

5. The method according to claim 4, characterized in that The step of determining a target energy storage converter having an output power greater than the output power of a single battery device comprises: Determining the derated output power of the energy storage converter according to environmental parameters of the environment in which the energy storage converter is located and / or performance parameters of the energy storage converter; A target energy storage converter having a derated output power greater than the output power of a single battery device is determined.

6. The method according to claim 5, characterized in that Before determining the target energy storage converter whose output power after de-rating is greater than the output power of a single battery device, determining the target energy storage converter whose output power is greater than the output power of a single battery device further includes: Determining a candidate target energy storage converter having a rated output power greater than an output power of a single battery device; Among them, a target energy storage converter whose output power after derating is greater than the output power of a single battery device is determined from the candidate target energy storage converters.

7. The method according to any one of claims 1-3, 5-6, characterized in that: The method further comprises: Obtaining type parameters of the energy storage converter; According to the type parameters of the energy storage converter and the target number of the energy storage converter, determining the number of energy storage boost converter systems that match the type parameters of the energy storage converter; the energy storage boost converter system includes at least one energy storage converter; the type of the energy storage boost converter system is the same as the type of the energy storage converter; Determine the configuration cost according to the acquired cost parameters of the energy storage boost converter system and the cost parameters of the battery container; Determine the configuration plan whose configuration cost meets the preset requirements.

8. A system for determining an energy storage system, characterized in that: The energy storage system includes an energy storage converter, and the DC side of the energy storage converter is used to connect to the energy storage battery system; The AC side of the energy storage converter is used to connect to the grid-connected equipment; the determination system includes: A receiving module, used for receiving the battery capacity requirement of the DC side and the apparent power requirement of the grid connection point of the AC side; A first determination module is used to determine the initial number of battery containers that meet the battery capacity requirement according to the battery capacity requirement and the capacity parameters of the battery container adapted to the energy storage battery system; and determine the required number of DC-side energy storage converters required to meet the battery capacity requirement according to the initial number of battery containers and the number of battery devices in a single battery container; A second determination module is used to determine the required amount of AC side energy storage converters required to meet the apparent power demand of the grid connection point according to the apparent power demand of the grid connection point on the AC side and the output power of a single energy storage converter; The third determination module is used to determine the demand for the DC side energy storage inverter as the target number of the energy storage inverters and the initial number of the battery containers as the target number of the battery containers if the demand for the DC side energy storage inverter is not less than the demand for the AC side energy storage inverter; if the demand for the DC side energy storage inverter is less than the demand for the AC side energy storage inverter, determine the demand for the AC side energy storage inverter as the target number of the energy storage inverter; and determine the target number of the battery containers based on the demand for the AC side energy storage inverter and the number of the battery devices.

9. An electronic device, characterized in that: The method comprises a processor and a memory, wherein the memory stores computer-readable instructions, and when the computer-readable instructions are executed by the processor, the method according to any one of claims 1 to 7 is executed.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 1 to 7 is performed.

11. A computer program product comprising a computer program or instructions, characterized in that When the computer program or instruction is executed by a processor, the method according to any one of claims 1 to 7 is performed.

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