Determination method and determination system of energy storage system, electronic equipment and storage medium

Abstract

The invention provides an energy storage system determination method and system, electronic equipment and a storage medium, and the method comprises the steps: determining the initial number of battery containers meeting the battery capacity demand according to the battery capacity demand and the capacity parameters of the battery containers matched with an energy storage battery system; according to the initial number and the number of the battery devices in the single battery container, determining the demand quantity of the direct current side energy storage converters needing to be configured to meet the battery capacity demand; according to the apparent power demand of the grid-connected point and the output power of the single energy storage converter, determining the demand quantity of the AC-side energy storage converter which needs to be configured to meet the apparent power demand of the grid-connected point; and adaptively determining the target number of the energy storage converters and / or the target number of the battery containers according to the difference between the demand quantity of the direct-current side energy storage converters and the demand quantity of the alternating-current side energy storage converters. The method improves the configuration efficiency and configuration accuracy of the energy storage system.

Description

Technical Field

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

[0002] With the booming development of the energy storage industry, the demand for energy storage systems is also increasing. In energy storage systems, PCS (Power Conversion System, referred to as PCS) is usually included for the conversion of DC and AC. Among them, the DC side of the PCS is used to connect the energy storage battery system, and the AC side of the PCS is used to connect the grid-connected equipment. In order to achieve the purpose of improving energy transmission efficiency and the stability of the energy storage system, the DC side and AC side of the PCS need to match. 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 requirements of the grid, and the AC side current of the PCS matches the load current of the grid. However, due to the complexity of the matching requirements, 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 determination method, a determination system, an electronic device, and a storage medium for an energy storage system, so as to improve 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, wherein the energy storage system includes an energy storage inverter, wherein the DC side of the energy storage inverter is used to connect to an energy storage battery system; and the AC side of the energy storage inverter is used to connect to a grid-connected device; the method includes: receiving a battery capacity requirement on the DC side and an apparent power requirement of a grid-connected point on the AC side; determining an initial number of battery containers that meet the battery capacity requirement based on the battery capacity requirement and capacity parameters of a battery container that is compatible with the energy storage battery system; and determining a required number of DC-side energy storage inverters that need to be configured to meet the battery capacity requirement based on the initial number of battery containers and the number of battery devices in a single battery container; and determining a required number of DC-side energy storage inverters that need to be configured to meet the battery capacity requirement based on the AC The demand for AC-side energy storage converters required to meet the apparent power demand of the grid-connected point is determined based on the apparent power demand of the grid-connected 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 number of the energy storage converters, and the initial number of the battery containers is determined as the target number 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 number of the energy storage converters. The target number of the battery containers is determined based on the demand for the AC-side energy storage converter and the number of battery devices.

[0005] In this way, the configuration personnel do not need to manually determine the relevant quantities to be configured, which improves the configuration efficiency, shortens the configuration time, and reduces the operation requirements for the configuration personnel. In addition, the present application takes into account the battery capacity requirements on the DC side and the apparent power requirements of the AC side grid connection point, so that the accuracy of each target quantity obtained can be higher, thereby improving the configuration accuracy.

[0006] Furthermore, adaptive adjustment is performed according to the difference between the demand for energy storage converters on the DC side and the demand for 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 demand and the apparent power demand of the grid connection point can be obtained, thereby improving the accuracy of each target quantity.

[0007] Optionally, the initial number of battery containers that meet the battery capacity requirement is determined based on the battery capacity requirement and the capacity parameters of the battery containers adapted to the energy storage battery system, including: determining 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; determining the available capacity of the energy storage battery system in year N according to the nominal capacity in year N and the capacity decay parameters of the energy storage battery in year N; if the available capacity in year N does not meet the capacity requirement in year N, then adding a preset number to the number in year N to obtain the initial number. Here, taking into account the fact that the energy storage battery will gradually decay during its use, combined with the available capacity in year N after decay and the capacity requirement in year N, the number of battery containers can be adaptively determined so that the energy storage battery system can continue to meet the capacity requirement.

[0008] Optionally, 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. In this way, the energy storage battery system will not have insufficient available capacity in the Nth year due to the objective fact that the capacity of the energy storage battery will gradually decay during actual use, thereby improving the accuracy of the target quantity to a certain extent.

[0009] Optionally, the method determines the required amount of AC side energy storage inverters required to meet the apparent power demand of the AC side grid connection point and the output power of a single energy storage inverter, including: determining the output power of a single battery device according to the capacity parameters, operating multiples and the number of battery devices of the battery container; determining a target energy storage inverter whose output power is greater than the output power of a single battery device; determining the AC side apparent power demand of the target energy storage inverter according to the apparent power demand of the grid connection point and the power loss parameter; and determining the required amount of AC side energy storage inverter according to the AC side apparent power demand and the output power of the target energy storage inverter.

[0010] In this way, 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, so that the configured battery container can enable the energy storage system to maintain good performance and continuously meet the actual power demand on the AC side. In this way, the energy storage system can better adapt to actual usage scenarios and provide electricity more efficiently and stably in actual usage scenarios.

[0011] Optionally, the determination of the target energy storage inverter whose output power is greater than the output power of a single battery device includes: determining the derated output power of the energy storage inverter according to the environmental parameters of the environment in which the energy storage inverter is located and / or the performance parameters of the energy storage inverter; and determining the target energy storage inverter 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 inverter in its specific working environment and / or specific performance conditions. Therefore, screening out the target energy storage inverter 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 output power after derating 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 whose rated output power is greater than the output power of a single battery device; wherein, from the candidate target energy storage converters, a target energy storage converter whose output power after derating is greater than the output power of a single battery device is determined. In this way, the number of energy storage converters whose output power after derating needs to be determined can be reduced, thereby effectively improving the efficiency of determining the target energy storage converter, and to a certain extent, also improving the configuration efficiency.

[0013] Optionally, the method further includes: obtaining the type parameters of the energy storage converter; determining the number of energy storage boost converter systems that match the 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; 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; determining the configuration cost according to the cost parameters of the energy storage boost converter system and the cost parameters of the battery container obtained; and determining a configuration scheme whose configuration cost meets the preset requirements. In this way, a configuration scheme with a lower configuration cost can be screened out, thereby saving the configuration cost.

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

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

[0016] In a third aspect, an embodiment of the present application provides an electronic device, comprising a processor and a memory, wherein 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 are performed.

[0017] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the steps in the method provided in the first aspect are performed.

[0018] In a fifth aspect, an embodiment of the present application provides a computer program product, which includes a computer program or instructions, and when the computer program or instructions are executed by a processor, the method described in the first aspect is performed.

[0019] Other features and advantages of the present application will be described in the following description, and partly become apparent from the description, or be understood by practicing the embodiments of the present application. The purpose and other advantages of the present application can be realized and obtained by the structures specifically pointed out in the written description, claims, and drawings. BRIEF 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 certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 A schematic diagram of the structure of an energy storage system provided in an embodiment of the present application; Figure 2 A flow chart of a method for determining an energy storage system provided in an embodiment of the present application; Figure 3 A structural block diagram of a determination system for an energy storage system provided in an embodiment of the present application; Figure 4 A schematic diagram of the structure of an electronic device for executing a method for determining an energy storage system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0022] 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 of the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0023] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so 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 this application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0024] It should be noted that the embodiments in this application or the technical features in the embodiments may be combined if there is no conflict.

[0025] In the related art, configuration personnel often face the problems of low efficiency and insufficient accuracy in actual operation; in order to solve this problem, the present application provides a determination method, a determination system, an electronic device, and a storage medium for an energy storage system; wherein the energy storage system includes at least an energy storage inverter, so that the number of battery containers required on the DC side can be determined according to the battery capacity requirement on the PCS DC side and related influencing factors; the required number of energy storage inverters is determined according to the power requirement on the PCS AC side and related influencing factors, and then the required number of battery containers and the required number of energy storage inverters are comprehensively considered to determine a configuration scheme that can match the two sides, so as to improve the configuration efficiency and configuration accuracy.

[0026] Furthermore, the above determination method can be applied to a configuration device, which can be, for example, a terminal device or a server device, wherein 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.

[0027] It should be noted that the defects existing in the solutions in the above-mentioned related technologies are obtained by the inventors after long-term practice and careful research. Therefore, the discovery process of the above-mentioned problems and the solutions proposed in the embodiments of the present invention for the above-mentioned problems below should all be the contributions made by the inventors to the present invention in the process of the present invention.

[0028] It should be noted that the energy storage system includes an energy storage inverter, the DC side of the energy storage inverter is used to connect to the energy storage battery system; the AC side of the energy storage inverter is used to connect to the grid-connected equipment.

[0029] Furthermore, the energy storage system may include one energy storage converter, or may include multiple energy storage converters (i.e., multiple energy storage converters), and multiple energy storage converters may be integrated in one or more energy storage boost converter systems and exist in the energy storage system. It is understandable that in addition to the energy storage converter, the energy storage boost converter system may also include other devices, such as a medium voltage transformer.

[0030] The energy storage battery system may include one or more energy storage batteries, and multiple energy storage batteries may be assembled in a battery container. A battery cluster may be used as an assembly unit of a battery container, or a battery stack may be used as an assembly unit of a battery container, which is not limited in this application.

[0031] The above-mentioned grid-connected equipment refers to a device that connects the power equipment to the power grid for energy exchange. The power equipment here is also the above-mentioned energy storage battery system, and the above-mentioned grid-connected equipment may include, for example, a transformer, an inverter, etc.

[0032] See also Figure 1 , which shows a schematic diagram of the structure of an energy storage system provided in an embodiment of the present application. Figure 1 As shown, taking the energy storage system including multiple energy storage converters, and multiple energy storage converters integrated in the energy storage boost converter system (including medium-voltage transformer in addition to the mounted energy storage converter) as an example, it can be seen that after the energy storage battery system outputs DC power, the DC power is transmitted to the energy storage boost converter system through a low-voltage cable, and the energy storage converter in the energy storage boost converter system converts the DC power into AC power, and then transmits it to the medium-voltage transformer in the energy storage boost converter system through a low-voltage cable for boosting to obtain medium-voltage AC power. Then, it is transmitted to the main transformer through a medium-voltage cable, and the AC power is boosted by the main transformer to obtain high-voltage AC power, and then the high-voltage AC power is transmitted to the grid connection point through a high-voltage cable, and finally transmitted to the grid to supply the grid-connected equipment.

[0033] It can be understood that the determination method provided in 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-mentioned energy storage converter.

[0034] Please continue reading Figure 2 , which shows a flow chart of a method for determining an energy storage system provided by an embodiment of the present application. Figure 2 As shown, the energy storage system determination method includes the following steps 101 to 106.

[0035] Step 101, receiving the battery capacity requirement of the DC side and the apparent power requirement of the grid connection point of the AC side; In some application scenarios, the above-mentioned battery capacity requirement and / or grid connection point apparent power requirement may be determined by configuration personnel according to the requirements of the energy storage project.

[0036] The battery capacity requirement may reflect the battery capacity required by the energy storage system. In some application scenarios, it may only include the battery capacity required at the moment. In other application scenarios, it may also include the battery capacity required in the Nth year, the Nth month, etc., where N may be any value such as 1, 2, 3, 5, etc.

[0037] The above-mentioned 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 (Apparent Power) can reflect the capacity of the grid-connected equipment, which can be specifically the product of the effective value of voltage and the effective value of 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, for example Figure 1 The high voltage output end of the high voltage cable.

[0038] It should be understood that the above-mentioned battery capacity requirement and the apparent power requirement of the grid connection point may be included in the same instruction or in different instructions, so that when the configuration device receives the instruction, it also receives the corresponding requirement.

[0039] Step 102, 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 container adapted to the energy storage battery system; The capacity parameters of the above battery containers can reflect the total capacity of the energy storage batteries installed therein, usually expressed in kilowatt-hours (kWh) or megawatt-hours (MWh), such as 3.44MWh, 6000kWh, etc.

[0040] In some application scenarios, for example, the quotient of the battery capacity required by the energy storage system and the capacity of a single battery container can be directly determined as the above initial quantity. 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 quantity. It is understandable that if the specific quantity value determined is not an integer, it can be rounded up and the nearest larger integer value can be determined as the initial quantity.

[0041] Step 103, determining 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; The battery device may be, for example, the battery cluster or battery stack. If the battery device is a battery cluster, the number of the battery devices is specifically the number of battery clusters. Furthermore, one battery cluster may be connected to one energy storage converter to realize a distributed structure of one cluster and one management. In addition, if the battery device is a battery stack, the number of the battery devices is specifically the number of battery stacks, and one battery stack may be connected to one energy storage converter to realize a centralized structure of one stack and one management.

[0042] In some application scenarios, the configuration device may, for example, determine the product of the above initial quantity and the number of battery devices in a single battery container as the required quantity of the DC-side energy storage converter.

[0043] Step 104, determining 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; It should be noted that energy storage systems usually need to output a voltage that matches the voltage level required by the power grid to ensure smooth transmission of electric energy. In other words, 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.

[0044] On this basis, this application considers determining the demand for AC side energy storage converters based on the apparent power demand at the grid connection point, including but not limited to the following reasons: (1) The apparent power (S) at the grid connection point on the AC side of the PCS includes active power (P) and reactive power (Q), and the relationship between the three is: By monitoring and controlling the apparent power at the grid connection point, the frequency of the grid can be adjusted by adjusting the active power, and the voltage of the grid can be adjusted by adjusting the reactive power, thereby ensuring the quality of power.

[0045] (2) When the grid voltage is abnormal, such as voltage drop or rise, PCS can achieve low voltage ride-through and high voltage ride-through by controlling the apparent power, thereby maintaining the stable operation of the grid.

[0046] (3) When the energy storage system is discharging, if the apparent power at the grid connection point is too large, it may cause power to flow back into the grid, causing power quality degradation or electrical failure. By monitoring the apparent power at the grid connection point, reverse flow can be effectively prevented.

[0047] (4) The monitoring and control of apparent power can help optimize the charging and discharging strategy of the energy storage system. For example, dynamically adjusting the output of active power and reactive power according to the needs of the power grid and the status of the energy storage system can improve the operating efficiency of the energy storage system.

[0048] (5) The apparent power of 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 equipment overload, damage, or even cause a safety accident.

[0049] (6) Many power grids have strict power requirements for the access of energy storage systems, including the apparent power and power factor range. By controlling the apparent power at the grid connection point, the energy storage system can better meet the grid access standards.

[0050] Therefore, considering the above reasons, the present application determines the required amount of energy storage converters on the AC side 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.

[0051] In some application scenarios, for example, the required grid connection point apparent power can be divided by the output power of a single energy storage converter to obtain the AC side energy storage converter demand. In other application scenarios, for example, other factors that affect the output power of the energy storage converter (such as the environment in which the energy storage converter is located, line loss during power transmission, etc.) can also be considered to determine the AC side energy storage converter demand.

[0052] Then, the configuration device may determine the target number of energy storage converters and / or the target number of battery containers according to the required number of DC-side energy storage converters and the required number of AC-side energy storage converters.

[0053] In some application scenarios, the configuration device can determine the difference between the energy storage converter requirements on the DC side and the energy storage converter requirements on the AC side, and then adaptively adjust the two according to the difference, so as to obtain the number of battery containers and energy storage converters that meet both the battery capacity requirements and the apparent power requirements of the grid connection point, so as to improve the accuracy of each target quantity. Thus, the configuration device can further perform the following steps: Step 105: 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 number of the energy storage converters, and the initial number of the battery containers is determined as the target number of the battery containers; That is to say, when the demand for energy storage converters on the DC side is greater than the demand for energy storage converters on the AC side, it means that although the demand for energy storage converters on the AC side can meet the apparent power demand of the grid connection point, the demand cannot meet the connection demand of the energy storage battery system (for example, one cluster one management or one stack one management). Therefore, in order to meet the connection demand, the demand for energy storage converters 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, the battery capacity demand on the DC side can be met, the apparent power demand of the grid connection point on the AC side can also be met, and the above-mentioned connection demand can be met.

[0054] In addition, when the demand for energy storage converters on the DC side is equal to the demand for energy storage converters on the AC side, it means that the demand for energy storage converters on the AC side can just meet the connection requirements on the DC side, so the demand for energy storage converters on the DC side 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 requirements on the DC side and the apparent power requirements of the grid connection point on the AC side can also be met.

[0055] It is understandable that when the demand for DC-side energy storage converters is determined as the target number of energy storage converters, the target number of battery containers to be configured is also the above-mentioned initial number of the currently determined demand for DC-side energy storage converters.

[0056] Step 106: 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 number of the energy storage converters; and 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.

[0057] That is to say, when the demand for energy storage converters on the DC side is less than the demand for energy storage converters on the AC side, it means that the demand for energy storage converters on the DC side is small, and the initial number of battery containers is also small at this time, which is insufficient to meet the apparent power demand of the grid connection point on the AC side. Since the demand for energy storage converters on the AC side is the minimum number of energy storage converters determined based on the apparent power demand of the grid connection point, the demand for energy storage converters on the AC side can be determined as the target number of energy storage converters at this time. In addition, the target number of battery containers can be re-determined based on the target number of energy storage converters.

[0058] 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.

[0059] In this implementation, the target number of energy storage converters and the target number of battery containers that simultaneously meet the battery capacity requirements on the DC side and the apparent power requirements of the AC side grid connection point can be obtained. In this way, there is no need for configuration personnel to manually determine the relevant number to be configured, which improves configuration efficiency, shortens configuration time, and reduces the operational requirements for configuration personnel. In addition, this application takes into account the battery capacity requirements on the DC side and the apparent power requirements of the AC side grid connection point, so that the accuracy of each target quantity obtained can be higher, thereby improving configuration accuracy.

[0060] In some optional implementations, the step 102 described above, determining 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, includes: Sub-step 1021, determining 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; For example, the product of the capacity of a single energy storage battery and the number of battery containers in year N may be determined as the nominal capacity of the energy storage battery system in that year.

[0061] Sub-step 1022, 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 decay parameter of the energy storage battery in the Nth year; The above capacity decay parameters can be regarded as parameters corresponding to relevant factors that cause capacity decay of the energy storage battery.

[0062] In some optional implementations, 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.

[0063] Among them, the depth of discharge (DoD) represents the percentage of the discharge amount of the energy storage battery to its rated capacity.

[0064] The cell conversion efficiency characterizes the ratio of actual output energy to input energy of the energy storage battery cell during the charging and discharging process, and is used to measure the energy loss of the cell during energy storage and release.

[0065] The above-mentioned SOH (State of Health, referred to as SOH) represents the health status of the energy storage battery.

[0066] The round trip efficiency (RTE) characterizes the ratio of output energy to input energy of the energy storage battery in a complete charge and discharge cycle, and is used to measure the efficiency of the energy storage battery in the energy conversion process.

[0067] In some application scenarios, the configuration device may, for example, 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, so as to obtain the corresponding available capacity of the energy storage battery system in the Nth year.

[0068] Specifically, if only one capacity decay parameter is considered, the above-mentioned nominal capacity in the Nth year can be multiplied by the capacity decay parameter of the energy storage battery in the Nth year, and the obtained product is the corresponding available capacity of the energy storage battery system in the Nth year. Multiply it by the DOD of the energy storage battery in year N, and the product is the corresponding available capacity of the energy storage battery system in year N. . That is, Alternatively, the above nominal capacity for the Nth year The cell conversion efficiency of the energy storage battery in the Nth year The product obtained is the corresponding available capacity of the energy storage battery system in year N. . That is, .

[0069] In addition, if multiple capacity decay parameters are considered, the above-mentioned nominal capacity in the Nth year can be multiplied by the multiple capacity decay 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. , SOH and RTE, then the corresponding available capacity of the energy storage battery system in year N is Equal to the nominal capacity in year N DOD and cell conversion efficiency in the Nth year The product of , SOH and RTE. That is, .

[0070] In this way, the configuration device can determine the available capacity of the energy storage battery system in year N through the above one or more capacity decay parameters of the energy storage battery in year N, so that the determined available capacity is closer to the actual capacity in year N. Then, the available capacity of the energy storage battery system in year N will not be insufficient due to the objective situation that the capacity of the energy storage battery gradually decays during actual use, thereby improving the accuracy of the target quantity to a certain extent.

[0071] Sub-step 1023, if the available capacity in the Nth year does not meet the capacity requirement in the Nth year, then adding a preset quantity to the quantity in the Nth year to obtain the initial quantity; The above-mentioned preset number may be, for example, 1, 2, etc.

[0072] It is understandable that the capacity of energy storage batteries often decays during continuous use. Therefore, if the determined available capacity in the Nth year cannot meet the capacity demand in the Nth year, more battery containers can be added to the energy storage battery system. The number after addition is the same as the initial number mentioned above.

[0073] Sub-step 1024: If the available capacity in the Nth year meets the capacity requirement in the Nth year, the quantity in the Nth year is determined as the initial quantity.

[0074] It is understandable that when determining the number of battery containers in the Nth year, the configuration device can first determine the estimated number of battery containers based on the battery capacity requirements and the capacity of a single battery container (such as a quotient). Then, based on the estimated number, the preset number is gradually increased to obtain the number in the Nth year.

[0075] For example, if the available capacity in the first year does not meet the capacity requirement in the first year, you can add 1 to the estimated quantity, and then redetermine the available capacity in year 0, year 1, year 2, and so on. If the available capacity in the first year meets the capacity requirement in the first year, the current quantity 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, you can add 1 to the current initial quantity (for example, the initial quantity obtained in the first year), and then redetermine the available capacity in year 1, year 2, and so on. If the available capacity in the second year meets the capacity requirement in the second year, the current quantity can be determined as the initial quantity. And so on, gradually determine the required available capacity in the Nth year, and then based on 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.

[0076] It should be clear that the above sub-steps 1021 to 1024 are a cyclic process, which aims to obtain the initial quantity that meets the battery capacity demand for the year.

[0077] In this implementation, taking into account the gradual degradation of energy storage batteries during their use, combined with the available capacity in the Nth year after degradation and the capacity demand in the Nth year, the number of battery containers can be adaptively determined so that the energy storage battery system can continue to meet capacity requirements.

[0078] It is understandable that in terms of time division, in addition to dividing by year to obtain the initial number of battery containers in the current year, it can also be divided by month or day to obtain the initial number of battery containers in different time periods.

[0079] In some optional implementations, the step 104 described above determines the required amount of AC side energy storage converters required to meet the apparent power demand of the grid connection point and the output power of a single energy storage converter, including: Sub-step 1041, determining the output power of a single battery device according to the capacity parameters and the operating multiple of the battery container and the number of the battery devices; The operating rate of the energy storage battery is the charge and discharge rate of the energy storage battery during actual operation.

[0080] In some application scenarios, the capacity of a single battery container can be With its operating rate After multiplication, the charge and discharge power of the battery container at the operating rate is obtained, and then the charge and discharge power of the battery container at the operating rate is divided by the number of battery devices in it. , thus obtaining the output power of a single battery device . That is, .

[0081] Sub-step 1042, determining a target energy storage converter having an output power greater than an output power of a single battery device; The above-mentioned output power may include, for example, rated output power, actual output power, etc.

[0082] In this way, since the energy storage inverter and the energy storage battery system form a one-cluster-one-management or one-pile-one-management connection mode, the output power of the energy storage inverter should match the output power of a single battery cluster or a single battery stack.

[0083] Furthermore, during the charging and discharging process, the battery cluster or battery stack may experience instantaneous power fluctuations or peak power demands. If the output power of the energy storage inverter is less than its output power, the battery cluster or battery stack may not be able to reach the maximum charge and discharge power when needed, thus affecting the performance of the energy storage system.

[0084] In addition, the operating conditions of the battery cluster or battery stack may change, and the energy storage inverter needs to adapt to the power requirements under different operating 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, causing its operating conditions to change, the energy storage inverter needs to adapt to the power requirements under the current operating conditions.

[0085] In addition, since the output power of the battery cluster or battery stack needs to be converted and adjusted by the energy storage inverter, if the output power of the energy storage inverter is less than the output power of the battery cluster or battery stack, it may cause a power bottleneck, thereby limiting the overall performance of the energy storage system.

[0086] Therefore, this implementation can improve the above situation by determining a target energy storage converter whose output power is greater than the output power of a single battery device.

[0087] Sub-step 1043, determining the AC side apparent power demand of the target energy storage converter according to the grid connection point apparent power demand and the power loss parameter; The above power loss parameters can be regarded as parameters corresponding to the relevant factors affecting the apparent power of the grid connection point. Figure 1 In the energy storage system shown, the power loss parameters may include, for example, one or more of the following: energy storage converter efficiency, 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, PCS efficiency reflects the power loss when the energy storage converter converts DC power into AC power, medium-voltage transformer efficiency reflects the power loss when the medium-voltage transformer transforms, main transformer efficiency reflects the power loss when the main transformer transforms, and line loss reflects the power loss caused by cable transmission.

[0088] In some application scenarios, for example, one or more power loss parameters can be multiplied, and then the apparent power demand value of the grid connection point and the product of the power loss parameters are divided to determine the apparent power actually required on the AC side, which corresponds to the above-mentioned apparent power demand on the AC side.

[0089] Sub-step 1044, determining the AC side energy storage converter requirement according to the AC side apparent power requirement and the output power of the target energy storage converter.

[0090] For example, the AC side apparent power demand value may be divided by the output power of a single target energy storage converter to obtain the AC side energy storage converter demand.

[0091] 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, so that the configured battery container can enable the energy storage system to maintain good performance and continuously meet the actual power demand on the AC side. In this way, the energy storage system can better adapt to actual usage scenarios and provide electricity more efficiently and stably in actual usage scenarios.

[0092] In some application scenarios, the influence of the environment in which the energy storage converter is located and its own performance on the configuration of the energy storage converter / battery container may be further considered. Therefore, in some optional implementations, the determination of the target energy storage converter having an output power greater than the output power of a single battery device described in the above sub-step 1042 includes: First, according to the environmental parameters of the environment in which the energy storage converter is located and / or the performance parameters of the energy storage converter, the derated output power of the energy storage converter is determined; The above-mentioned derated output power is also the maximum output power that the energy storage converter can achieve under specific environment and / or specific performance. The above-mentioned specific environment is characterized by environmental parameters, and the above-mentioned specific performance is characterized by performance parameters.

[0093] It is understandable that the energy storage converter has different output powers after derating under different working environments. For example, when working at different altitudes and / or different temperatures, the power consumed by the energy storage converter is different, so the output power after derating is also different. Then, the output power of the energy storage converter under the actual working environment can be determined in combination with the environment in which the energy storage converter is located, and the output power is also the above-mentioned output power after derating. Further, for example, the environmental derating coefficient corresponding to the environmental parameters can be obtained in advance, and the power loss of the energy storage converter in the environment can be characterized by the environmental derating coefficient. For example, the altitude derating coefficient of the energy storage converter at an altitude of 2000 meters can be obtained in advance as 1, and the altitude derating coefficient at an altitude of 2100 meters can be obtained as 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 coefficient. For another example, it can be pre-obtained that the temperature derating coefficient of the energy storage inverter when working at 40° is 1, and the temperature derating coefficient when working at 50° is 0.98. Then, when the energy storage inverter works at different temperatures, its derated output power can be the product of the rated output power of the energy storage inverter and the corresponding temperature derating coefficient.

[0094] Similarly, the performance of the energy storage converter is different, and power will be lost to different degrees. For example, under different operating 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 the output power is also the above-mentioned output power after derating. Further, for example, the performance derating coefficient corresponding to the performance parameter can be obtained in advance, and the power loss of the energy storage converter under the current performance can be characterized by the performance derating coefficient. For example, the voltage derating coefficient of the energy storage converter when the DC voltage is (1000-1500) V can be obtained in advance as 1, and the voltage derating coefficient when the DC voltage is (1500-2500) V can be obtained as 0.98. Then, when the energy storage converter works at different operating 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 coefficient.

[0095] It is understandable that if both environmental parameters and performance parameters are considered at the same time, the rated output power of the energy storage inverter can be multiplied by the corresponding derating factor to obtain the derated output power. For example, the rated output power of the energy storage inverter can be multiplied by the temperature derating factor of 0.98 and the voltage derating factor of 0.98 to obtain the derated output power.

[0096] Then, a target energy storage converter whose output power after derating is greater than the output power of a single battery device is determined.

[0097] In this implementation, the derated output power can reflect the maximum output power of the energy storage inverter under its specific working environment and / or specific performance conditions. Therefore, screening out the target energy storage inverter 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.

[0098] In some application scenarios, since the output power after derating needs to consider environmental parameters and / or performance parameters, the efficiency of determining the target energy storage inverter may be low. Therefore, in order to improve the efficiency of determining the target energy storage inverter, the energy storage inverter can be preliminarily screened before the output power screening before derating. That is, first determine the candidate target energy storage inverter whose rated output power is greater than the output power of a single battery device; then, from the candidate target energy storage inverters, determine the target energy storage inverter whose output power after derating is greater than the output power of a single battery device.

[0099] In this implementation, the candidate target energy storage converters can be first screened out by the rated output power, and then the candidate target energy storage converters can be screened out by the derated output power. In this way, the number of energy storage converters that need to determine the derated output power can be reduced, thereby effectively improving the efficiency of determining the target energy storage converters and, to a certain extent, improving the configuration efficiency.

[0100] In some application scenarios, multiple energy storage converters may be integrated into an energy storage boost converter system for ease of management and transportation. Therefore, in some optional implementations, after step 105 or step 106, the method further includes: First, obtaining the type parameters of the energy storage converter; In some application scenarios, the type parameters 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 parameters of the energy storage converter, it can be regarded as obtaining its rated output power.

[0101] In other application scenarios, the type parameter of the energy storage converter can also be characterized 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 of the grid connection point.

[0102] Then, according to the type parameters of the energy storage converter and the target number of the energy storage converter, the number of energy storage boost converter systems matching the type parameters of the energy storage converter is determined; 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; That is to say, one or more energy storage converters of the same type can be mounted in the energy storage boost converter system. Therefore, the energy storage converters can be divided according to the type parameters, and then the number of energy storage boost converter systems can be determined according to the target number of different types of energy storage converters.

[0103] For example, for any type of energy storage boost converter system, determine the number of battery containers that can be connected to a single energy storage boost converter system of this type. Here, for example, the maximum number of energy storage converters that can be mounted in a single energy storage boost converter system of this type can be obtained. and the number of battery units in a single battery container that can be connected , and then take the quotient of the two to get the number of battery containers . That is, Here, if the quotient is not an integer, it can be rounded down to get an integer quotient.

[0104] Then, the total number of fully loaded energy storage boost converter systems can be determined. Here, for example, the target number of energy storage converters of the same type can be used. And the maximum number of energy storage converters that can be mounted in a single energy storage boost converter system , determine the total number of fully loaded energy storage boost converter systems .For example, . Here, if the quotient value is not an integer, it can also be rounded down to obtain an integer quotient. It should be noted that if a maximum of A energy storage converters can be mounted in the energy storage boost converter system, and the energy storage boost converter system is mounted with A energy storage converters, then it can be determined that the energy storage boost converter system is fully loaded, otherwise it is determined that the energy storage boost converter system is not fully loaded. Here, the value of A can be, for example, 2, 3 or 4.

[0105] Then, the total number of battery containers that can be connected to the fully loaded energy storage boost converter system can be determined. Here, for example, the total number of the fully loaded energy storage boost converter system can be Number of battery containers that can be connected to a single energy storage boost converter system Multiply them together to get the total number of battery containers that can be connected to the fully loaded energy storage boost converter system. . That is, .

[0106] Then, the number of energy storage boost converter systems that are not fully loaded can be determined. Here, for example, the target number of energy storage converters of the same type can be Subtract the number of energy storage converters that have been mounted, and then add the difference to the maximum number of energy storage converters that can be mounted in a single energy storage boost converter system. The quotient is used to obtain the number of energy storage boost converter systems that are not fully loaded. . That is, Here, if the quotient is not an integer, it can be rounded up to get an integer quotient.

[0107] Then, the total number of battery containers that can be connected to the partially loaded energy storage boost converter system can be determined. Here, for example, the target number of battery containers can be Total number of battery containers that can be connected to a fully loaded energy storage boost converter system The total number of battery containers that can be connected to the non-full-load energy storage boost converter system is obtained by subtracting . That is to say .

[0108] In summary, the required number of each type of energy storage boost converter system and the corresponding number of battery containers are determined. It is understandable that the relevant parameters of the battery containers that can be mounted on 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.

[0109] 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 the 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 connected thereto. The total cost is also the above configuration cost.

[0110] Then, a configuration scheme whose configuration cost meets the preset requirements can be determined.

[0111] The above preset requirements may include, for example, that the configuration cost is the lowest, that the configuration cost is greater than a certain cost threshold, etc.

[0112] In this implementation, configuration solutions with lower configuration costs can be screened out, thereby saving configuration costs.

[0113] Those skilled in the art will appreciate that, in the above method of a specific embodiment, the order in which the steps are written does not imply a strict execution order and does not constitute any limitation on the implementation process. The specific execution order of the steps should be determined by their functions and possible internal logic.

[0114] See also Figure 3 , which shows a structural block diagram of a determination system of an energy storage system provided in an embodiment of the present application. The determination system of the energy storage system may be a module, a program segment or a code on an electronic device. It should be understood that the determination system is similar to the above Figure 2 The method embodiment corresponds to and can be executed Figure 2 The method embodiment involves various steps.

[0115] Optionally, the determination system of the energy storage system includes a receiving module 301, a first determination module 302, a second determination module 303, and a third determination module 304. The receiving module 301 is used to receive the battery capacity requirement of the DC side and the apparent power requirement of the grid connection point of the AC side; the first determination module 302 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 containers adapted to the energy storage battery system; and, 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 DC side energy storage converters that need to be configured to meet the battery capacity requirement; the second determination module 303 is used to determine the number of DC side energy storage converters that meet the battery capacity requirement 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. The demand for AC-side energy storage converters required for the apparent power demand of the grid connection point; a third determination module 304, for determining the demand for DC-side energy storage converters as the target number of energy storage converters and the initial number of battery containers as the target number of battery containers if the demand for DC-side energy storage converters is not less than the demand for AC-side energy storage converters; if the demand for DC-side energy storage converters is less than the demand for AC-side energy storage converters, determining the demand for AC-side energy storage converters as the target number of energy storage converters; and determining the target number of battery containers based on the demand for AC-side energy storage converters and the number of battery devices.

[0116] Optionally, the first determination module 302 further determines the nominal capacity of the energy storage battery system in the Nth year according to the capacity parameters and the number of battery containers in the Nth year; determines 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, then increases a preset number based on the number in the Nth year to obtain the initial number.

[0117] Optionally, 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.

[0118] Optionally, the second determination module 303 is further used to: 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 inverter whose output power is greater than the output power of a single battery device; determine the AC side apparent power demand of the target energy storage inverter according to the apparent power demand of the grid connection point and the power loss parameter; determine the AC side energy storage inverter demand according to the AC side apparent power demand and the output power of the target energy storage inverter.

[0119] Optionally, the second determination module 303 is further used to: determine the derated output power of the energy storage inverter according to environmental parameters of the environment in which the energy storage inverter is located and / or performance parameters of the energy storage inverter; and determine a target energy storage inverter whose derated output power is greater than the output power of a single battery device.

[0120] Optionally, the second determination module 303 is further used to: before determining the target energy storage inverter whose output power after derating is greater than the output power of a single battery device, determine a candidate target energy storage inverter whose rated output power is greater than the output power of a single battery device; wherein, from the candidate target energy storage inverters, the target energy storage inverter whose output power after derating is greater than the output power of a single battery device is determined.

[0121] Optionally, the system also includes a cost determination module, which is used to: obtain type parameters of the energy storage inverter; determine the number of energy storage boost converter systems that match the type parameters of the energy storage inverter according to the type parameters of the energy storage inverter and the target number of the energy storage inverter; the energy storage boost converter system includes at least one energy storage inverter; the type of the energy storage boost converter system is the same as the type of the energy storage inverter; 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 scheme whose configuration cost meets preset requirements.

[0122] It is understandable that, in order to facilitate the management and use of data, the above determination system may also set up multiple databases to store different data respectively. For example, the following databases may be set up: The cost database is used to store cost data of different types of energy storage converters and / or energy storage boost converter systems, and cost data of different types of battery containers.

[0123] The energy storage battery database is used to store battery-related data, such as SOH, RTE, etc.

[0124] The battery container database is used to store relevant data of the battery container, such as the capacity parameters, output power, DC voltage range, number of battery clusters, number of battery stacks, battery cell conversion efficiency, operating rate, etc. of a single battery container.

[0125] The PCS database is used to store the relevant parameters of different types of energy storage converters, such as the rated output power of the energy storage converter, the altitude derating factor, the temperature derating factor, the voltage derating factor, the PCS efficiency, the type of energy storage boost converter system, and the number of energy storage converters that can be mounted on the energy storage boost converter system.

[0126] The AC side database is used to store the line loss corresponding to different cables, the efficiency loss 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.

[0127] It should be noted that those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the system described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0128] See also Figure 4 , Figure 4 A structural diagram of an electronic device for executing a method for determining an energy storage system provided in 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 direct connection and communication between these components. Among them, the communication interface 402 of the device in the embodiment of the present application is used to communicate signaling or data with other node devices. The memory 403 can be a high-speed RAM memory or a non-volatile memory (non-volatile memory), such as at least one disk memory. The memory 403 can also be at least one storage device located away from the aforementioned processor. Computer-readable instructions are stored in the memory 403. When the computer-readable instructions are executed by the processor 401, the electronic device can execute the methods provided by the above-mentioned method embodiments.

[0129] Understandably, Figure 4 The structure shown is for illustration only, and the electronic device may also include Figure 4 More or fewer components as shown, or with Figure 4 Different configurations are shown. Figure 4 Each component shown in the figure can be implemented by hardware, software or a combination thereof.

[0130] An embodiment of the present application provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the methods provided by the above-mentioned method embodiments can be executed.

[0131] An embodiment of the present application provides a computer program product, which includes a computer program stored on a non-transitory computer-readable storage medium, and the computer program includes program instructions. When the program instructions are executed by a computer, the computer can execute the methods provided by the above-mentioned method embodiments.

[0132] 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 schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For 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 mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some communication interface, device or unit, which can be electrical, mechanical or other forms.

[0133] In addition, the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0134] Furthermore, the functional modules in the various embodiments of the present application may be integrated together to form an independent part, or each module may exist independently, or two or more modules may be integrated to form an independent part.

[0135] In this document, relational terms such as first and second, etc. are used merely to distinguish one entity or operation from another entity or operation, but do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0136] The above description is only an embodiment of the present application and is not intended to limit the protection scope of the present application. For those skilled in the art, the present application may have various modifications and variations. 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; Determining 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.

Images