Energy storage configuration method and apparatus and electronic device

Abstract

The present disclosure relates to the field of energy storage systems and provides an energy storage configuration method and apparatus and an electronic device. The method comprises: determining the required power of a target electricity consumption area; on the basis of the required power, determining the rated energy of an energy storage system, wherein the energy storage system comprises a plurality of energy storage batteries, the plurality of energy storage batteries are connected to an electrical grid by means of a plurality of string inverters, the plurality of energy storage batteries and the plurality of string inverters correspond to each other on a one-to-one basis, and each of the plurality of energy storage batteries comprises a plurality of battery cells; on the basis of the rated capacity of the energy storage system, determining battery parameters respectively corresponding to the plurality of energy storage batteries; and on the basis of the battery parameters respectively corresponding to the plurality of energy storage batteries, determining parameter configuration results respectively corresponding to the plurality of string inverters. The present disclosure solves the technical problem in the prior art of the charging and discharging of each energy storage battery in an energy storage system being unbalanced, which results in the low use efficiency of the energy storage system and the short service life of the batteries.

Description

Energy storage configuration method, device and electronic equipment

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 202311624641.X, filed on November 27, 2023, entitled “Energy Storage Configuration Method, Device and Electronic Device”. The contents disclosed in the above-mentioned Chinese patent application are hereby cited in their entirety as part or all of this application. Technical Field

[0003] The present disclosure relates to the field of energy storage systems, and more particularly, to an energy storage configuration method, device, and electronic equipment. Background Art

[0004] Currently, electrochemical energy storage plays a vital role at the power source, grid, and load levels. On the power generation side, which primarily consists of renewable energy power plants like wind and solar, adding energy storage equipment can reduce curtailment, significantly increasing power generation revenue while also providing power support to the grid. On the grid side, in large power plants such as collection stations and substations, adding centralized large-scale energy storage can effectively regulate the grid's frequency and voltage through charging and discharging, ensuring stable operation. On the load side, in industrial and commercial plants and industrial parks, energy storage systems can be deployed to discharge energy during peak electricity prices, supporting the park's load and alleviating grid load pressure. Energy storage can also be charged during off-peak electricity prices, reducing grid energy waste and enabling peak-off-peak arbitrage, generating significant benefits for industrial and commercial users. Energy storage systems can also serve as emergency power sources, providing temporary power to key equipment.

[0005] When configuring energy storage for industrial and commercial parks, factors such as the park's load capacity, charge and discharge rates, local peak and off-peak electricity prices, floor space, and safety regulations must be considered. Existing industrial and commercial energy storage systems primarily consist of centralized prefabricated battery cabins, outdoor integrated converter and booster cabins, and distributed unit energy storage systems with integrated batteries and converters. The key difference between these two energy storage systems lies in their flexibility. Both are outdoor cabin arrangements, offering the advantage of ease of installation and commissioning. However, for industrial and commercial applications, the same capacity configuration requires more land resources, and the charge and discharge rate is typically around 0.5C (coulomb). Centralized energy storage often faces the problem of having a large number of parallel DC battery clusters, increasing inter-cluster circulation and imbalanced charge and discharge. This can lead to some batteries under-producing while others exceed their actual output, increasing losses and reducing system efficiency, as well as increasing system failure rates and shortening system lifespan. While distributed energy storage systems reduce inter-cluster circulation, they also have lower energy density per unit, increasing costs, and requiring more floor space for the same energy density.

[0006] To address the above-mentioned problems, no effective solutions have been proposed so far.

[0007] Summary of the Invention

[0008] The embodiments of the present disclosure provide an energy storage configuration method, device, and electronic device to at least solve the technical problem in the related art that the charging and discharging of each energy storage battery in the energy storage system is unbalanced, resulting in low energy storage system efficiency and short battery life.

[0009] According to one aspect of an embodiment of the present disclosure, there is provided a method for energy storage configuration, comprising: determining a power demand of a target power consumption area; determining a rated energy of an energy storage system based on the power demand, wherein the energy storage system comprises a plurality of energy storage batteries, the plurality of energy storage batteries being connected to a power grid via a plurality of string converters, the plurality of energy storage batteries corresponding to the plurality of string converters on a one-to-one basis, and each of the plurality of energy storage batteries comprising a plurality of battery cells; determining battery parameters corresponding to the plurality of energy storage batteries respectively based on the rated capacity of the energy storage system, wherein the battery parameters include at least: the battery cell energies corresponding to the plurality of battery cells respectively, and the rated energy of the energy storage battery; determining parameter configuration results corresponding to the plurality of string converters respectively based on the battery parameters corresponding to the plurality of energy storage batteries, wherein the parameter configuration results include at least the rated power of the string converter.

[0010] According to another aspect of an embodiment of the present disclosure, an energy storage configuration device is further provided, including: a first determination module, configured to determine the required power of a target power consumption area; a second determination module, configured to determine the rated energy of an energy storage system based on the required power, wherein the energy storage system includes multiple energy storage batteries, and the multiple energy storage batteries are connected to the power grid through multiple string converters, the multiple energy storage batteries correspond to the multiple string converters one-to-one, and each of the multiple energy storage batteries includes multiple battery cells; a third determination module, configured to determine battery parameters corresponding to the multiple energy storage batteries according to the rated capacity of the energy storage system, wherein the battery parameters include at least: the cell energy corresponding to the multiple battery cells, and the rated energy of the energy storage battery; a fourth determination module, configured to determine parameter configuration results corresponding to the multiple string converters based on the battery parameters corresponding to the multiple energy storage batteries, wherein the parameter configuration results include at least the rated power of the string converter.

[0011] According to another aspect of an embodiment of the present disclosure, an electronic device is also provided, comprising one or more processors and a memory, wherein the memory is used to store one or more programs, wherein when the one or more programs are executed by the one or more processors, the one or more processors implement any one of the energy storage configuration methods.

[0012] In an embodiment of the present disclosure, the power demand of the target power consumption area is determined; based on the power demand, the rated energy of the energy storage system is determined, wherein the energy storage system includes a plurality of energy storage batteries, and the plurality of energy storage batteries are connected to the power grid through a plurality of string converters, and the plurality of energy storage batteries correspond to the plurality of string converters one by one, and each of the plurality of energy storage batteries includes a plurality of battery cells; according to the rated capacity of the energy storage system, the battery parameters corresponding to the plurality of energy storage batteries are determined, wherein the battery parameters include at least: the cell energy corresponding to the plurality of battery cells, and the energy storage battery The rated energy of the battery is determined; based on the battery parameters corresponding to the multiple energy storage batteries, the parameter configuration results corresponding to the multiple string converters are determined, wherein the parameter configuration results include at least the rated power of the string converter, thereby achieving the purpose of accurately configuring the parameters of the energy storage battery and the string converter based on the required power of the target power consumption area, thereby achieving the technical effect of improving the utilization efficiency of the energy storage system and reducing the use loss of the energy storage battery, and further solving the technical problem in the related art that the charging and discharging of each energy storage battery in the energy storage system is unbalanced, resulting in low utilization efficiency of the energy storage system and short battery life. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The drawings described herein are used to provide a further understanding of the present disclosure and constitute a part of this application. The illustrative embodiments of the present disclosure and their descriptions are used to explain the present disclosure and do not constitute an improper limitation of the present disclosure. In the drawings:

[0014] FIG1 is a flow chart of an energy storage configuration method according to an embodiment of the present disclosure;

[0015] FIG2 is a schematic diagram of an optional architecture of a station-type energy storage system configuration based on a string converter according to an embodiment of the present disclosure;

[0016] FIG3 is a primary main wiring diagram of an optional station-type energy storage system configuration based on a string converter according to an embodiment of the present disclosure;

[0017] FIG4 is a flow chart of an optional energy storage configuration method according to an embodiment of the present disclosure;

[0018] FIG5 is a schematic diagram of an energy storage configuration device according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to better understand the solutions of the present disclosure, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the embodiments described are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present disclosure.

[0020] It should be noted that the terms "first", "second", etc. in the specification and claims of the present disclosure and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present disclosure described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0021] According to an embodiment of the present disclosure, a method embodiment of energy storage configuration is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0022] FIG1 is a flow chart of an energy storage configuration method according to an embodiment of the present disclosure. As shown in FIG1 , the method includes the following steps:

[0023] Step S102: determining the power demand of the target power consumption area.

[0024] In an optional embodiment, determining the required power of the target power consumption area includes: determining the line load required power and the energy storage load required power of the target power consumption area; and determining the required power of the target power consumption area based on the line load required power and the energy storage load required power.

[0025] Optionally, the target electricity consumption area may be an industrial or commercial park. Calculation and evaluation can be performed based on the line load and energy storage load power requirements of the industrial or commercial park as follows:

[0026] Step S1021, Line Load Calculation: First, the capacity and load of the industrial and commercial park's power lines must be understood. Monitoring equipment can be used to record the power load and power factor for each time period and calculate the average and peak loads. Based on the load curve and line capacity, the required power of the line load can be determined.

[0027] Step S1022, Energy Storage Load Power Calculation: The energy storage system can be used to balance load fluctuations and peak loads in the industrial and commercial park. Monitoring equipment can record the energy storage system's charge and discharge power and calculate the average and peak loads. Based on the capacity and efficiency of the energy storage system, the power requirements of the energy storage load can be determined.

[0028] Step S1023, Calculate the comprehensive power demand: Based on the line load and energy storage load power requirements of the industrial and commercial park, the power demands of the two can be added together to obtain the comprehensive power demand. This ensures that the power supply of the industrial and commercial park meets the load requirements and provides sufficient energy storage support.

[0029] It's important to note that the calculation and assessment of power demand must consider factors such as the industrial and commercial park's load characteristics, the power requirements of electrical equipment, and load fluctuations. This provides a more accurate and reliable power demand, better aligned with the park's actual electricity needs. Furthermore, adjustments and optimizations can be made based on actual conditions to meet the park's power and energy storage needs.

[0030] Step S104: Determine the rated energy of the energy storage system based on the required power. The energy storage system includes multiple energy storage batteries, which are connected to the power grid via multiple string converters. The multiple energy storage batteries correspond to the multiple string converters in a one-to-one manner, and each of the multiple energy storage batteries includes multiple battery cells.

[0031] Optionally, the energy storage system described above is a building-based energy storage system. A building-based energy storage system is a building or complex of buildings that integrates energy storage equipment and is used to store and release electrical energy. It typically consists of a battery pack, inverter, energy management system, etc., and can store electrical energy for emergency use. This energy storage system can be connected to the power grid to store and release electrical energy according to grid demand, thereby balancing the supply and demand differences in the power system and improving the stability and reliability of the grid. At the same time, the building-based energy storage system can also be used to address the peak and valley price differences in the electricity market. By purchasing and storing electricity during off-peak periods and releasing it during peak periods, electricity costs can be reduced. In addition, the building-based energy storage system can also provide backup power for buildings, ensuring their normal operation during power outages or emergencies.

[0032] Optionally, the energy storage system provided in the embodiments of the present disclosure is a station-type energy storage system with a string converter, which is an energy storage system that connects multiple energy storage batteries through a string converter. A string converter is a power conversion device used in solar photovoltaic systems. It converts the DC power of solar panels connected in string into AC power to supply the power grid or for self-use. Each energy storage battery has its own DC-DC converter (i.e., DC-DC converter) to adjust the DC output voltage of the energy storage battery to the DC voltage required by the system. These energy storage batteries are connected to the AC power grid through a string converter to achieve energy storage and power output. This type of energy storage system has the following advantages: 1. High flexibility: Each energy storage battery can operate independently, which means that the capacity and power of the system can be flexibly configured according to demand. 2. Fault isolation: If a storage battery in the system fails, the other storage batteries can still operate normally without affecting the entire system. 3. High efficiency: The string converter can achieve maximum power point tracking and power distribution, making the system's energy conversion efficiency higher. 4. High reliability: Since each energy storage battery has its own DC-DC converter, the system has higher reliability and robustness. Even if one of the energy storage batteries fails, the other energy storage batteries can still operate normally. In general, the station-type energy storage system based on string converters can improve the flexibility, reliability and efficiency of the energy storage system. For example, Figure 2 is an architectural diagram of an optional station-type energy storage system configuration based on a string converter according to an embodiment of the present disclosure, and Figure 3 is a primary main wiring diagram of an optional station-type energy storage system configuration based on a string converter according to an embodiment of the present disclosure. As shown in Figures 2 and 3, the energy storage system configuration process is based on energy storage batteries, a three-level battery management system (BMS), a battery cluster bus unit and an energy storage bidirectional converter. The BMS is used to collect, monitor, control and protect the battery system, and can upload battery data to the string converter PCS for system operation protection; the PCS is used to control the charge and discharge power of the battery pack. The rated power P of a single string converter PCS does not exceed 200kW, and the rated energy of a single battery stack (i.e., a single energy storage battery) is Q2: Q2 ≤ n*P (where n = 1 / C, and C is the charge / discharge rate). The multiple cells in a single energy storage battery are connected in parallel or series.

[0033] In an optional embodiment, the rated energy of the energy storage system is determined based on the demand power, including: determining the peak-valley electricity price duration corresponding to the target electricity consumption area, wherein the peak-valley electricity price duration is the duration during a preset time period when the electricity price is less than a preset electricity price threshold; and determining the rated energy of the energy storage system based on the demand power and the peak-valley electricity price duration.

[0034] Optionally, the required power P1 is determined based on the line load power and energy storage load power requirements corresponding to the target power consumption area, and the peak and valley electricity price duration t is determined based on the electricity price information of each time period in the area where the target power consumption area is located, thereby calculating the charge and discharge rate C = 1 / t and the rated energy of the energy storage system Q = P1*t.

[0035] Step S106 : determining battery parameters corresponding to the plurality of energy storage batteries according to the rated capacity of the energy storage system, wherein the battery parameters include at least: cell energy corresponding to the plurality of cells and the rated energy of the energy storage battery.

[0036] Optionally, after the rated capacity of the energy storage system is determined, battery parameters related to each energy storage battery and battery cell in the energy storage system can be further obtained on this basis. The battery parameters obtained on this basis can better meet the rated capacity requirements of the energy storage system.

[0037] Optionally, the cell energy is determined to be Q1, the number of cell series branches corresponding to the energy storage battery (i.e., battery pack PACK) in the energy storage system is S, the number of cell parallel branches is J, the DC rated voltage of a single energy storage battery is Vn=3.2*S (battery system DC voltage Vdc), and the DC voltage range is preferably 1000≤2.65*S<Vdc<3.65*S≤1500Vdc; determine the rated energy Q2 of a single energy storage battery, wherein Vdc refers to the voltage range during the charging and discharging process of the battery system, that is, the voltage range corresponding to the state of charge SOC=0% to SOC=100%, and Vn refers to the voltage when SOC=50%.

[0038] Step S108 : determining parameter configuration results corresponding to the plurality of string converters based on the battery parameters corresponding to the plurality of energy storage batteries, wherein the parameter configuration results at least include the rated power of the string converters.

[0039] Optionally, the string converter is a key component in the energy storage system, and its function is to connect multiple energy storage units (such as batteries, supercapacitors, etc.) in series to achieve reliable operation of the energy storage system. It can ensure the efficient operation of the energy storage batteries by optimizing current and voltage, and can control the output power of the energy storage system to meet different needs. In addition, the string converter can also monitor and detect faults in the energy storage system to ensure the safe and stable operation of the energy storage system. In short, the string converter plays an important role in connection, control and management in the energy storage system. In the above manner, the parameters of each group of transmission converters are further configured based on the battery parameters corresponding to the multiple energy storage batteries, so that the configured string converter can better meet the operating requirements of the energy storage system, better ensure the efficient operation of the energy storage batteries, and the safe and stable operation of the energy storage system. In an optional embodiment, based on the battery parameters corresponding to the multiple energy storage batteries, the parameter configuration results corresponding to the multiple string converters are determined, including: determining the charge and discharge rate of the energy storage system based on the peak and valley electricity price duration; determining the target rated power corresponding to the multiple string converters according to the rated energy and charge and discharge rate corresponding to the multiple energy storage batteries, wherein the target rated power is greater than or equal to the product of the rated energy of the corresponding energy storage battery and the charge and discharge rate.

[0040] Optionally, the duration t of peak and valley electricity prices is determined based on electricity price information for each time period in the target electricity consumption area, thereby calculating the charge and discharge rate C = 1 / t. Through the above approach, when determining the target rated power of each string converter, not only the rated capacity of each energy storage battery is considered, but also the charge and discharge rate of the energy storage system. The resulting string converter can better meet the charge and discharge requirements of the energy storage system, improving the operational stability of the energy storage system.

[0041] In an optional embodiment, the minimum DC-side voltage corresponding to each of the multiple string converters is less than or equal to a preset first value, and the maximum DC-side voltage corresponding to each of the multiple string converters is less than or equal to a preset second value. The preset first value is determined based on the number of series branches of battery cells included in the energy storage battery corresponding to the string converter, and the preset first value is less than the preset second value. The number of the multiple string converters is greater than or equal to the quotient of the required power and the rated capacity of the corresponding energy storage battery. For example, when configuring the string converter, the following conditions are met: the rated power of the string converter PCS P ≥ Q2*C, the number of string converter PCSs is N ≥ P1 / P, where N is rounded to an integer; the DC-side voltage range of the string converter PCS is: the minimum DC-side voltage Umin ≤ 2.7*S, and the maximum DC-side voltage Umax ≤ 1500 Vdc. The string converter configured in this manner can better adapt to the power and energy requirements of the target power consumption area. It can not only meet the charge and discharge rate requirements of the energy storage system, but also reduce the number of parallel clusters of energy storage batteries, reduce the circulation current of the energy storage system and thus improve system efficiency.

[0042] In an optional embodiment, target rated powers corresponding to multiple string converters are determined according to the rated energies and charge and discharge rates corresponding to the multiple energy storage batteries, including: determining the target rated power corresponding to any one of the multiple string converters according to the rated energies and charge and discharge rates corresponding to the multiple energy storage batteries in the following manner: determining a first rated power corresponding to any one string converter according to the rated energy and charge and discharge rate corresponding to any one energy storage battery; determining a power utilization rate corresponding to any one string converter based on the rated energy, charge and discharge rate, and the first rated power corresponding to any one string converter; and determining the target rated power corresponding to any one string converter based on the first rated power corresponding to any one string converter when the power utilization rate corresponding to any one string converter is greater than a preset power utilization threshold.

[0043] Optionally, the rated power of the string converter is selected based on the power utilization. When the power utilization corresponding to the string converter is large and greater than a preset power utilization threshold, the rated power is determined as the target rated power of the string converter. That is, when the power utilization corresponding to any string converter is greater than the preset power utilization threshold, the first rated power corresponding to any string converter is used as the target rated power. In this way, the charge and discharge rate requirements of the energy storage system can be met, while reducing the number of parallel clusters of energy storage batteries, reducing the circulating current of the energy storage system, and thus improving system efficiency.

[0044] In an optional embodiment, the first rated power corresponding to any string converter is determined based on the rated energy corresponding to any energy storage battery and the charge and discharge rate, including: determining the ratio of the rated energy of the energy storage system to the rated energy corresponding to any energy storage battery; when the ratio is an integer, determining the first rated power corresponding to any string converter based on the rated energy corresponding to any energy storage battery and the charge and discharge rate.

[0045] Optionally, the ratio between the rated energy of the energy storage system and the rated energy corresponding to the energy storage battery may be an integer or may not be an integer. To ensure that the power and energy of the energy storage battery can be fully utilized, when configuring the energy storage system and the energy storage battery, an energy storage battery that is an integer multiple of the rated energy of the energy storage system is selected. The rated power of the string converter is determined based on the rated energy and charge and discharge multiples of the energy storage battery, thereby improving the power and energy utilization of the energy storage battery.

[0046] In an optional embodiment, the method further includes: when the power utilization of any string converter is less than or equal to a preset power utilization threshold, updating the battery parameters corresponding to the energy storage battery corresponding to any string converter until the new power utilization of any string converter is less than or equal to the preset power utilization threshold; or when the ratio is not an integer, updating the rated energy of the energy storage system and the battery parameters corresponding to the energy storage battery corresponding to any string converter until the new power utilization of any string converter is less than or equal to the preset power utilization threshold.

[0047] Optionally, when the calculated power utilization of any string converter is too small and less than a preset power utilization threshold, or when the calculated first rated power corresponding to any string converter is greater than a preset power threshold (such as 200), the battery parameters of the energy storage battery (i.e., the energy Q1 of a single cell, the rated energy Q2 of a single energy storage battery) are re-updated, and the rated power of the string converter, the power utilization, the ratio of the rated energy of the energy storage system to the rated energy corresponding to any energy storage battery, etc. are recalculated until the corresponding power utilization requirements and rated power requirements are met.

[0048] Optionally, when the ratio of the rated energy of the energy storage system to the rated energy corresponding to any energy storage battery is not an integer, it indicates that the power and energy of the energy storage battery cannot be fully utilized. At this time, it is necessary to readjust the rated energy Q of the energy storage system, the energy of a single battery cell Q1, and the rated energy Q2 of a single energy storage battery, and on this basis, recalculate the rated power of the string converter, the power utilization rate, the ratio of the rated energy of the energy storage system to the rated energy corresponding to any energy storage battery, etc. until the corresponding power utilization rate requirements and rated power requirements are met.

[0049] Through the above steps S102 to S108, the purpose of accurately configuring the parameters of the energy storage battery and the string converter based on the required power of the target power consumption area can be achieved, thereby achieving the technical effect of improving the efficiency of the energy storage system and reducing the use loss of the energy storage battery. In addition, the technical problem of unbalanced charging and discharging of the energy storage batteries in the energy storage system in the related art, which leads to low efficiency of the energy storage system and short battery life, is solved.

[0050] Based on the above embodiments and optional embodiments, the present disclosure proposes an optional implementation method. FIG4 is a flowchart of an optional energy storage configuration method according to an embodiment of the present disclosure. As shown in FIG4, the method is applied to a station-type energy storage system framework based on a string converter, including an energy storage battery, a three-level battery management system (BMS), a battery cluster bus unit, and an energy storage bidirectional converter, wherein the BMS is used to collect, monitor, control, and protect the battery system, and can upload battery data to the string converter PCS for system operation protection; the PCS is used to control the charge and discharge power of the battery pack; wherein: the rated power P of a single string converter PCS does not exceed 200kW, and the rated energy of the connected single stack battery (i.e., a single energy storage battery) is Q2: Q2≤n*P (where n=1 / C, C is the charge and discharge rate). The method includes:

[0051] Step S1: Determine the power demand P1 based on the line load power and energy storage load power requirements of the industrial and commercial park (target electricity consumption area). Confirm the peak and valley electricity price duration t based on the electricity price information of each time period in the area where the industrial and commercial park is located, and thus calculate the charge and discharge rate C = 1 / t of the energy storage system and the rated energy of the energy storage system Q = P1*t.

[0052] Step S2: Determine that the cell energy is Q1, the number of energy storage batteries (i.e., battery packs PACK) in series in the energy storage system is S, the number of parallel batteries is J, the DC rated voltage of a single energy storage battery is Vn=3.2*S(Vdc), and the DC voltage range is preferably 1000≤2.65*S<Vdc<3.65*S≤1500Vdc; the rated energy of a single energy storage battery is Q2.

[0053] Step S3: The PCS rated power P ≥ Q2*C, the number of PCSs is N ≥ P1 / P, where N is rounded to an integer. The PCS DC link voltage range is: minimum DC link voltage Umin ≤ 2.7*S, and maximum DC link voltage Umax ≤ 1500 Vdc. Specifically, if the calculated value of P1 / P is an integer, proceed to step S4. Otherwise, optimize the system energies Q, Q1, and Q2, and return to step S1.

[0054] Step S4: Calculate the string converter power utilization factor η = (Q2*C) / P. Repeat steps S1 to S3 based on existing standard string converter parameters and mainstream battery system parameters to obtain the maximum η value. Select the rated power P value of the corresponding single string converter for model selection.

[0055] Step S5: Determine whether the calculated rated power P value of the single string converter is less than or equal to 200. If so, use the calculated rated power P value of the single string converter as the final configuration of the single string converter. Otherwise, re-optimize the energy Q1 and Q2 of the battery stack (i.e., the energy storage battery) and return to step S2.

[0056] Step S6: The rated energy Q of the energy storage system, the rated power P of a single string converter PCS, and the maximum power utilization factor η obtained by analyzing the above steps can optimize the energy storage battery and string converter PCS configuration of the energy storage system to a certain extent.

[0057] It should be noted that the energy storage battery rated capacity, string converter rated power, and charge / discharge hours are optimized to achieve the optimal configuration, taking into account factors such as power load, system capacity margin, and electricity price. A minimum number of parallel energy storage battery stacks is recommended to reduce inter-cluster circulation, improve system operational stability, reduce system losses, and increase efficiency. A 1500Vdc energy storage converter is recommended, with a higher rated power value to increase power density and reduce system costs. When configuring the energy storage battery capacity and string converter PCS power, ensure that the energy storage battery system can operate at full power and discharge for the entire period during peak electricity price periods, and can be fully charged during low electricity price periods.

[0058] The present disclosure can achieve at least one of the following effects: 1) Through the configuration flexibility of the string converter PCS and the station-type battery stack system, single cluster management and fewer clusters in parallel can be achieved, thereby reducing or eliminating the inter-cluster circulation generated by the parallel connection of battery clusters, improving the stability of system operation, and at the same time reducing system losses, improving system efficiency, and increasing energy utilization and customer benefits. 2) It is suitable for the long-term charging and discharging needs of industry and commerce, and the maximum charging and discharging time is configured according to the local electricity price. It can be fully charged and discharged during the peak and valley electricity prices, thereby maximizing peak and valley arbitrage. 3) The single-stack battery + PCS system operates independently and can automatically allocate power according to the SOC status of the battery system to keep the status of each battery stack consistent; a single stack failure does not affect the system operation, and modular management and operation are simple and convenient, thereby systematically reducing the failure rate, increasing the online rate of the battery system, and reducing maintenance costs.

[0059] In this embodiment, an energy storage configuration device is also provided, which is used to implement the above-mentioned embodiments and preferred embodiments. The details that have been described will not be repeated here. As used below, the terms "module" and "device" can be a combination of software and / or hardware that implements a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, implementation in hardware, or a combination of software and hardware, is also possible and contemplated.

[0060] According to an embodiment of the present disclosure, an embodiment of a device for implementing the above-mentioned energy storage configuration method is also provided. FIG5 is a structural schematic diagram of an energy storage configuration device according to an embodiment of the present disclosure. As shown in FIG5 , the above-mentioned energy storage configuration device includes: a first determination module 500, a second determination module 502, a third determination module 504, and a fourth determination module 506, wherein:

[0061] A first determining module 500 is configured to determine the required power of a target power consumption area;

[0062] a second determining module 502, connected to the first determining module 500, configured to determine a rated energy of the energy storage system based on the required power, wherein the energy storage system includes a plurality of energy storage batteries, the plurality of energy storage batteries are connected to a power grid via a plurality of string converters, the plurality of energy storage batteries correspond to the plurality of string converters on a one-to-one basis, and each of the plurality of energy storage batteries includes a plurality of battery cells;

[0063] a third determining module 504, connected to the second determining module 502, configured to determine battery parameters corresponding to the plurality of energy storage batteries according to the rated capacity of the energy storage system, wherein the battery parameters include at least: cell energy corresponding to the plurality of battery cells and the rated energy of the energy storage battery;

[0064] The fourth determination module 506 is connected to the third determination module 504 and is configured to determine parameter configuration results corresponding to the multiple string converters based on the battery parameters corresponding to the multiple energy storage batteries, wherein the parameter configuration results include at least the rated power of the string converter.

[0065] In the embodiment of the present disclosure, a first determination module 500 is set to determine the required power of the target power consumption area; a second determination module 502 is connected to the first determination module 500 and is set to determine the rated energy of the energy storage system based on the required power, wherein the energy storage system includes a plurality of energy storage batteries, the plurality of energy storage batteries are connected to the power grid through a plurality of string converters, the plurality of energy storage batteries correspond to the plurality of string converters one-to-one, and each of the plurality of energy storage batteries includes a plurality of battery cells; a third determination module 504 is connected to the second determination module 502 and is set to determine the battery parameters corresponding to the plurality of energy storage batteries according to the rated capacity of the energy storage system, wherein the battery parameters include at least: the number of battery cells. The fourth determination module 506 is connected to the third determination module 504 and is configured to determine the parameter configuration results corresponding to the multiple string converters based on the battery parameters corresponding to the multiple energy storage batteries, wherein the parameter configuration results include at least the rated power of the string converter, thereby achieving the purpose of accurately configuring the parameters of the energy storage battery and the string converter based on the required power of the target power consumption area, thereby achieving the technical effect of improving the utilization efficiency of the energy storage system and reducing the use loss of the energy storage battery, and thus solving the technical problem in the related art that the charging and discharging of each energy storage battery in the energy storage system is unbalanced, resulting in low utilization efficiency of the energy storage system and short battery life.

[0066] It should be noted that the above modules can be implemented by software or hardware. For example, for the latter, it can be implemented in the following ways: the above modules can be located in the same processor; or the above modules can be located in different processors in any combination.

[0067] It should be noted that the first determination module 500, the second determination module 502, the third determination module 504, and the fourth determination module 506 correspond to steps S102 to S108 in the embodiment. The examples and application scenarios implemented by the above modules and the corresponding steps are the same, but are not limited to the contents disclosed in the above embodiment. It should be noted that the above modules, as part of the device, can be run on a computer terminal.

[0068] It should be noted that the optional or preferred implementation of this embodiment can be found in the relevant description in the embodiment, which will not be repeated here.

[0069] The above-mentioned energy storage configuration device may also include a processor and a memory. The above-mentioned first determination module 500, second determination module 502, third determination module 504, fourth determination module 506, etc. are all stored in the memory as program modules, and the processor executes the above-mentioned program modules stored in the memory to realize corresponding functions.

[0070] The processor includes a core, which retrieves corresponding program modules from memory. There can be one or more cores. Memory may include non-permanent memory in a computer-readable medium, random access memory (RAM), and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory includes at least one memory chip.

[0071] According to an embodiment of the present application, an embodiment of a non-volatile storage medium is further provided. Optionally, in this embodiment, the non-volatile storage medium includes a stored program, wherein when the program is executed, the device where the non-volatile storage medium is located is controlled to execute any of the above energy storage configuration methods.

[0072] Optionally, in this embodiment, the non-volatile storage medium may be located in any computer terminal in a computer terminal group in a computer network, or in any mobile terminal in a mobile terminal group, and the non-volatile storage medium includes a stored program.

[0073] Optionally, when the program is running, the device where the non-volatile storage medium is located is controlled to perform the following functions: determine the required power of the target power consumption area; based on the required power, determine the rated energy of the energy storage system, wherein the energy storage system includes multiple energy storage batteries, the multiple energy storage batteries are connected to the power grid through multiple string converters, the multiple energy storage batteries correspond to the multiple string converters one-to-one, and each of the multiple energy storage batteries includes multiple battery cells; according to the rated capacity of the energy storage system, determine the battery parameters corresponding to the multiple energy storage batteries, wherein the battery parameters include at least: the cell energy corresponding to the multiple battery cells, and the rated energy of the energy storage battery; based on the battery parameters corresponding to the multiple energy storage batteries, determine the parameter configuration results corresponding to the multiple string converters, wherein the parameter configuration results include at least the rated power of the string converter.

[0074] According to an embodiment of the present application, an embodiment of a processor is further provided. Optionally, in this embodiment, the processor is used to run a program, wherein the program executes any of the above energy storage configuration methods when it is run.

[0075] According to an embodiment of the present application, an embodiment of a computer program product is also provided, which, when executed on a data processing device, is suitable for executing a program that initializes any one of the above-mentioned energy storage configuration method steps.

[0076] Optionally, the above-mentioned computer program product, when executed on a data processing device, is suitable for executing a program initialized with the following method steps: determining the required power of the target power consumption area; determining the rated energy of the energy storage system based on the required power, wherein the energy storage system includes multiple energy storage batteries, the multiple energy storage batteries are connected to the power grid through multiple string converters, the multiple energy storage batteries correspond to the multiple string converters one-to-one, and each of the multiple energy storage batteries includes multiple battery cells; determining battery parameters corresponding to the multiple energy storage batteries according to the rated capacity of the energy storage system, wherein the battery parameters include at least: the cell energy corresponding to the multiple battery cells, and the rated energy of the energy storage battery; based on the battery parameters corresponding to the multiple energy storage batteries, determining the parameter configuration results corresponding to the multiple string converters, wherein the parameter configuration results include at least the rated power of the string converter.

[0077] An embodiment of the present disclosure provides an electronic device, which includes a processor, a memory, and a program stored in the memory and executable on the processor. When the processor executes the program, the following steps are implemented: determining the required power of a target power consumption area; determining the rated energy of an energy storage system based on the required power, wherein the energy storage system includes multiple energy storage batteries, the multiple energy storage batteries are connected to a power grid through multiple string converters, the multiple energy storage batteries correspond to the multiple string converters one-to-one, and each of the multiple energy storage batteries includes multiple battery cells; determining battery parameters corresponding to the multiple energy storage batteries according to the rated capacity of the energy storage system, wherein the battery parameters include at least: the battery cell energy corresponding to the multiple battery cells, and the rated energy of the energy storage battery; determining parameter configuration results corresponding to the multiple string converters based on the battery parameters corresponding to the multiple energy storage batteries, wherein the parameter configuration results include at least the rated power of the string converter.

[0078] The above order of the embodiments of the present disclosure is for description only and does not represent the superiority or inferiority of the embodiments.

[0079] In the above embodiments of the present disclosure, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0080] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only exemplary. For example, the division of the above modules can be a logical function division. In actual implementation, there may be other division methods, such as multiple modules 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 through some interfaces, modules or indirect coupling or communication connection of modules, which can be electrical or other forms.

[0081] The modules described above as separate components may or may not be physically separate, and the components shown as modules may or may not be physical modules, that is, they may be located in one place or distributed across multiple modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the present embodiment.

[0082] In addition, the functional modules in the various embodiments of the present disclosure may be integrated into a single processing module, or each module may exist physically separately, or two or more modules may be integrated into a single module. The integrated modules may be implemented in the form of hardware or software functional modules.

[0083] If the above-mentioned integrated module is implemented in the form of a software functional module and sold or used as an independent product, it can be stored in a computer-readable non-volatile storage medium. Based on this understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a non-volatile storage medium, including a number of instructions for enabling a computer device (which can be a personal computer, a server or a network device, etc.) to execute all or part of the steps of the various embodiments of the present invention. The aforementioned non-volatile storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk and other media that can store program code.

[0084] The above is only a preferred embodiment of the present disclosure. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present disclosure. These improvements and modifications should also be regarded as within the scope of protection of the present disclosure.

[0085] Industrial Applicability: The solution provided by the embodiment of the present disclosure can be applied to the field of energy storage systems. In the embodiment of the present disclosure, the required power of the target power consumption area is determined; based on the required power, the rated energy of the energy storage system is determined, wherein the energy storage system includes multiple energy storage batteries, and the multiple energy storage batteries are connected to the power grid through multiple string converters. The multiple energy storage batteries correspond to the multiple string converters one-to-one, and each of the multiple energy storage batteries includes multiple battery cells; according to the rated capacity of the energy storage system, the battery parameters corresponding to the multiple energy storage batteries are determined, wherein the battery parameters include at least: the cell energy corresponding to the multiple battery cells, and the rated energy of the energy storage battery; based on the battery parameters corresponding to the multiple energy storage batteries, the parameter configuration results corresponding to the multiple string converters are determined, wherein the parameter configuration results include at least the rated power of the string converter, thereby achieving the technical effect of improving the utilization efficiency of the energy storage system and reducing the utilization loss of the energy storage battery.

Claims

1. A method for energy storage configuration, comprising: Determine the power demand of the target power consumption area; Based on the required power, determining the rated energy of the energy storage system, wherein the energy storage system includes a plurality of energy storage batteries, the plurality of energy storage batteries are connected to the power grid through a plurality of string converters, the plurality of energy storage batteries correspond to the plurality of string converters one by one, and each of the plurality of energy storage batteries includes a plurality of battery cells; Determine battery parameters corresponding to the plurality of energy storage batteries respectively according to the rated capacity of the energy storage system, wherein the battery parameters at least include: cell energy corresponding to the plurality of battery cells respectively, and rated energy of the energy storage battery; Based on the battery parameters respectively corresponding to the multiple energy storage batteries, parameter configuration results respectively corresponding to the multiple string converters are determined, wherein the parameter configuration results at least include the rated power of the string converter.

2. The method according to claim 1, wherein: The step of determining the required power of the target power consumption area includes: Determine the line load power requirement and energy storage load power requirement of the target power consumption area; The required power of the target power consumption area is determined based on the required power of the line load and the required power of the energy storage load.

3. The method according to claim 1, wherein: The step of determining the rated energy of the energy storage system based on the required power includes: Determine the peak-valley electricity price duration corresponding to the target electricity consumption area, wherein the peak-valley electricity price duration is the duration during which the electricity price is less than a preset electricity price threshold within a preset period of time; The rated energy of the energy storage system is determined according to the required power and the duration of the peak and valley electricity prices.

4. The method according to claim 3, wherein: The determining, based on the battery parameters respectively corresponding to the plurality of energy storage batteries, parameter configuration results respectively corresponding to the plurality of string converters comprises: Determining a charge and discharge rate of the energy storage system based on the duration of the peak and valley electricity prices; According to the rated energies respectively corresponding to the multiple energy storage batteries and the charge and discharge rate, the target rated powers respectively corresponding to the multiple string converters are determined, wherein the target rated powers are greater than or equal to the product of the rated energy of the corresponding energy storage battery and the charge and discharge rate.

5. The method according to claim 4, wherein: The determining, according to the rated energies respectively corresponding to the plurality of energy storage batteries and the charge and discharge ratios, the target rated powers respectively corresponding to the plurality of string converters comprises: According to the rated energies respectively corresponding to the multiple energy storage batteries and the charge and discharge ratios, the target rated power corresponding to any one of the multiple string converters is determined in the following manner: Determine a first rated power corresponding to any one of the string converters according to the rated energy corresponding to any one of the energy storage batteries and the charge and discharge rate; Determine the power utilization rate corresponding to any one of the string converters based on the rated energy corresponding to any one of the energy storage batteries, the charge and discharge rate, and the first rated power corresponding to any one of the string converters; When the power utilization rate corresponding to any one of the string converters is greater than a preset power utilization rate threshold, the target rated power corresponding to any one of the string converters is determined based on the first rated power corresponding to any one of the string converters.

6. The method according to claim 5, wherein: The determining, according to the rated energy corresponding to any one of the energy storage batteries and the charge and discharge ratio, the first rated power corresponding to any one of the string converters comprises: Determining a ratio of the rated energy of the energy storage system to the rated energy corresponding to any one of the energy storage batteries; When the ratio is an integer, the first rated power corresponding to any one of the string converters is determined according to the rated energy corresponding to any one of the energy storage batteries and the charge and discharge ratio.

7. The method according to claim 6, wherein: The method further comprises: When the power utilization rate of any one of the string converters is less than or equal to a preset power utilization rate threshold, the battery parameters corresponding to the energy storage battery corresponding to any one of the string converters are updated until the new power utilization rate of any one of the string converters is less than or equal to the preset power utilization rate threshold; or When the ratio is not an integer, the rated energy of the energy storage system and the battery parameters corresponding to the energy storage battery corresponding to any one of the string converters are updated until the new power utilization of any one of the string converters is less than or equal to the preset power utilization threshold.

8. The method according to any one of claims 4 to 7, wherein: The minimum value of the DC side voltage corresponding to each of the plurality of string converters is less than or equal to a preset first value, and the maximum value of the DC side voltage corresponding to each of the plurality of string converters is less than or equal to a preset first value. A second value, wherein the preset first value is determined based on the number of series-connected branches of cells included in the energy storage battery corresponding to the string converter, and the preset first value is less than the preset second value; The number of the plurality of string converters is greater than or equal to a quotient of the required power and a rated capacity of a corresponding energy storage battery.

9. An energy storage configuration device, comprising: A first determination module is configured to determine the required power of a target power consumption area; a second determination module, configured to determine the rated energy of the energy storage system based on the required power, wherein the energy storage system includes a plurality of energy storage batteries, the plurality of energy storage batteries are connected to the power grid through a plurality of string converters, the plurality of energy storage batteries correspond to the plurality of string converters one by one, and each of the plurality of energy storage batteries includes a plurality of battery cells; A third determination module is configured to determine battery parameters corresponding to the plurality of energy storage batteries respectively according to the rated capacity of the energy storage system, wherein the battery parameters at least include: cell energy corresponding to the plurality of battery cells respectively, and rated energy of the energy storage battery; The fourth determination module is configured to determine parameter configuration results corresponding to the multiple string converters respectively based on the battery parameters corresponding to the multiple energy storage batteries respectively, wherein the parameter configuration results at least include the rated power of the string converter.

10. An electronic device comprising one or more processors and a memory, wherein the memory is used to store one or more programs, wherein: When the one or more programs are executed by the one or more processors, the one or more processors implement the energy storage configuration method described in any one of claims 1 to 8.

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