Method for operating control of energy storage charging system, control device and energy storage charging system

Abstract

The application provides a kind of operation control method, control device and energy storage charging system of energy storage charging system, relate to charging control technical field.The method comprises;Obtain the historical charging operation power data of each charging terminal in energy storage charging system in preset historical time period;According to the historical charging operation power data of each charging terminal and corresponding historical charging demand power data, determine the reserved capacity of energy storage device in energy storage charging system, and the reserved capacity is used to control the expansion of energy storage device.Therefore, the application can realize efficient reuse and flexible deployment of energy storage device without additional new energy storage device, adapt to the dynamic change demand of electric vehicle charging load.

Description

Technical Field

[0001] This application relates to the field of charging control technology, and more specifically, to an operation control method, control device, and energy storage charging system for an energy storage charging system. Background Technology

[0002] With the booming development of the new energy vehicle industry, the market share of supercharging electric vehicles continues to increase, leading to a growing demand for high-power charging. Under the existing power distribution network architecture, the instantaneous power capacity that the power grid can provide has an upper limit. When multiple electric vehicles are charging at high power simultaneously, the power distribution network often struggles to meet the instantaneous high power demand, resulting in power limitations for charging equipment and severely impacting the construction and utilization efficiency of electric vehicle charging facilities.

[0003] To address the problem of insufficient power capacity in the distribution network leading to limited charging equipment capacity, energy storage and charging technologies are combined. For example, existing technologies typically configure the power and capacity of energy storage devices based on load conditions.

[0004] However, in existing technologies, the energy storage capacity of energy storage devices is entirely used for peak-valley arbitrage. When the actual charging load exceeds the grid's power supply capacity and requires expansion, additional energy storage devices must be added to meet the demand. This approach easily leads to over-allocation of energy storage capacity and power, resulting in low utilization efficiency of energy storage devices. It also prevents efficient reuse and flexible allocation of energy storage devices, and cannot well adapt to the dynamic changes in electric vehicle charging load. Summary of the Invention

[0005] The purpose of this application is to provide an operation control method, control device, and energy storage charging system for energy storage charging system, which divides the energy storage capacity into reserved capacity and working capacity. The working capacity is used to execute peak-valley arbitrage strategies to obtain electricity price difference revenue; the reserved capacity is used to adapt to the dynamic adjustment of power distribution capacity. That is, this application can achieve efficient reuse and flexible allocation of energy storage devices without adding new energy storage devices, and adapt to the dynamic change demand of electric vehicle charging load.

[0006] To achieve the above objectives, the technical solutions adopted in the embodiments of this application are as follows: In a first aspect, embodiments of this application provide an operation control method for an energy storage charging system, comprising: acquiring historical charging power data of each charging terminal in the energy storage charging system within a preset historical time period; determining the reserved capacity of the energy storage device in the energy storage charging system based on the historical charging power data of each charging terminal and the corresponding historical charging demand power data, wherein the reserved capacity is used for capacity expansion control of the energy storage device.

[0007] Optionally, determining the reserved capacity of the energy storage device in the energy storage charging system based on the historical charging operation power data and corresponding historical charging demand power data of each charging terminal includes: determining the first total deviation power of the energy storage charging system based on the historical charging operation power data and corresponding historical charging demand power data of each charging terminal; determining the expansion demand power of the energy storage device based on the first total deviation power; and determining the reserved capacity based on the expansion demand power.

[0008] Optionally, determining the first total deviation power of the energy storage charging system based on the historical charging operation power data and corresponding historical charging demand power data of each charging terminal includes: determining the historical total charging operation power and historical total charging demand power of the energy storage charging system based on the historical charging operation power data and corresponding historical charging demand power data of each charging terminal; if the historical total charging operation power is less than the historical total charging demand power, then calculating the first total deviation power based on the power difference between the preset maximum operating power in the energy storage charging system and the historical total charging demand power.

[0009] Optionally, determining the expansion power requirement of the energy storage device based on the first total deviation power includes: determining the first total deviation power as the expansion power requirement; or, if the first total deviation power is less than or equal to a first preset deviation power threshold, calculating the first historical charging deviation power of each charging terminal based on the historical charging operation power data of each charging terminal and the corresponding historical charging power requirement data; and determining the expansion power requirement based on the first historical charging deviation power of each charging terminal.

[0010] Optionally, determining the expansion power requirement based on the first historical charging deviation power of each charging terminal includes: determining the second historical charging deviation power of each charging terminal based on the historical charging operation power data of each charging terminal and a preset maximum operating power of the charging terminal; determining whether the first historical charging deviation power and the second historical charging deviation power of each charging terminal meet the corresponding deviation power conditions; determining target charging terminals from among the charging terminals whose first historical charging deviation power and the second historical charging deviation power both meet the corresponding deviation power conditions; and calculating the second total deviation power of the energy storage charging system as the expansion power requirement based on the sum of the first historical charging deviation power of each target charging terminal.

[0011] Optionally, determining whether the first historical charging deviation power and the second historical charging deviation power of each charging terminal meet the corresponding deviation power condition includes: determining whether the first historical charging deviation power of each charging terminal is greater than or equal to a second preset deviation power threshold; if the first historical charging deviation power of the first charging terminal is greater than or equal to the second preset deviation power threshold, then determining that the first historical charging deviation power of the first charging terminal meets the corresponding deviation power condition; determining whether the second historical charging deviation power of each charging terminal is greater than or equal to a third preset deviation power threshold; if the second historical charging deviation power of the second charging terminal is greater than or equal to the third preset deviation power threshold, then determining that the second historical charging deviation power of the second charging terminal meets the corresponding deviation power condition.

[0012] Optionally, determining the reserved capacity based on the expansion demand power includes: performing time integration on the expansion demand power for multiple time periods within the preset historical time period to obtain the total deviation capacity for the multiple time periods; and determining the maximum deviation capacity from the total deviation capacity for the multiple time periods as the reserved capacity.

[0013] Optionally, the method further includes: determining the discharge cutoff state of charge parameters of the energy storage device based on the reserved capacity and the rated capacity of the energy storage device.

[0014] In a second aspect, embodiments of this application provide a control device, including: a processor and a memory, wherein the memory stores machine-executable instructions that can be executed by the processor, and the processor can execute the machine-executable instructions to implement any of the methods described in the first aspect.

[0015] Thirdly, embodiments of this application provide an energy storage charging system, including: a control device, an energy storage device, at least one charging host, and charging terminals connected to each charging host; wherein the energy storage device and the charging host are both connected to a preset input power line; the control device is communicatively connected to the energy storage device and each charging terminal, and the control device is used to execute any of the methods described in the first aspect; or, the energy storage device is communicatively connected to each charging terminal, and the energy storage device is further used to execute any of the methods described in the first aspect.

[0016] Compared with the prior art, the operation control method, control device, and energy storage charging system provided in this application have the following technical advantages: This application provides an operation control method, control device, and energy storage charging system. The operation control method includes: acquiring historical charging power data of each charging terminal in the energy storage charging system within a preset historical time period; then, based on the historical charging power data of each charging terminal and the corresponding historical charging demand power data, determining the reserved capacity of the energy storage device in the energy storage charging system to achieve capacity expansion control of the energy storage device, preventing excessive reservation of the energy storage device from causing a preset grid backflow accident, and thus adapting to dynamic adjustment of distribution capacity to improve the utilization efficiency of the energy storage charging system. Therefore, this application can divide the energy storage capacity into working capacity and reserved capacity. The working capacity (schedulable capacity) is used to execute peak-valley arbitrage strategies to obtain electricity price difference revenue, realizing the economic efficiency of the energy storage charging system; the reserved capacity is used to adapt to dynamic adjustment of distribution capacity, transforming the implicit power shortage problem into calculable reserved capacity, making the expansion target clear and quantifiable, and thus achieving dual-objective optimization of arbitrage revenue and expansion guarantee through capacity segmentation. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of an energy storage and charging system provided in an embodiment of this application; Figure 2 This is a schematic diagram of the structure of a control device provided in an embodiment of this application; Figure 3 A flowchart illustrating an operation control method for an energy storage charging system provided in this application embodiment. Figure 1 ; Figure 4 A schematic diagram illustrating a charging and discharging operation control strategy for an energy storage and charging system based on peak-valley electricity price differences, provided as an embodiment of this application; Figure 5 A flowchart illustrating an operation control method for an energy storage charging system provided in this application embodiment. Figure 2 ; Figure 6 A flowchart illustrating an operation control method for an energy storage charging system provided in this application embodiment. Figure 3 ; Figure 7 A schematic diagram illustrating the total charging power deviation and energy demand provided in this application embodiment. Figure 1 ; Figure 8 A schematic diagram illustrating the total charging power deviation and energy demand provided in this application embodiment. Figure 2 ; Figure 9 A flowchart illustrating an operation control method for an energy storage charging system provided in this application embodiment. Figure 4 ; Figure 10 A schematic diagram illustrating the charging capacity and power deviation of an energy storage charging system provided in an embodiment of this application; Figure 11 A flowchart illustrating an operation control method for an energy storage charging system provided in this application embodiment. Figure 5 ; Figure 12 A flowchart illustrating an operation control method for an energy storage charging system provided in this application embodiment. Figure 6 ; Figure 13 A schematic diagram illustrating the discharge capacity and power deviation of an energy storage charging system provided in an embodiment of this application; Figure 14 A flowchart illustrating an operation control method for an energy storage charging system provided in this application embodiment. seven ; Figure 15 A schematic diagram showing the reserved capacity and discharge cutoff state of charge parameters of an energy storage charging system provided in an embodiment of this application; Figure 16 A flowchart illustrating an operation control method for an energy storage charging system provided in this application embodiment. Figure 8 ; Figure 17 This is a schematic diagram of the operation control device for an energy storage and charging system provided in an embodiment of this application. Detailed Implementation

[0019] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.

[0020] Figure 1 This is a schematic diagram of an energy storage and charging system provided in an embodiment of this application. Figure 1 As shown, the energy storage and charging system 100 may include: a control device 110, an energy storage device DES, at least one charging host CHGm, and at least one charging terminal EVm_n connected to each charging host CHGm. Multiple charging terminals EVm_n can share the power distribution capacity of the connected charging host CHGm. When the power of multiple charging hosts CHGm exceeds the preset power distribution capacity limit of the power grid, capacity can be expanded by configuring the energy storage device.

[0021] In this system, the energy storage device DES and the charging host CHGm are connected in parallel to a preset input power line. Through the control device 110 or the dynamic regulation of the energy storage device DES, the preset grid input power of the energy storage charging system 100 can be managed in a unified manner. For example, during off-peak hours of the preset grid load, the energy storage device DES absorbs and stores electrical energy from the preset grid to avoid energy waste; during peak hours of the preset grid load or peak electricity prices, the energy from the energy storage device DES is prioritized to power the charging terminal EVm_n, reducing dependence on the instantaneous power of the preset grid. This process can smooth grid power fluctuations, reduce grid expansion pressure, improve energy utilization efficiency, and reduce overall operating costs.

[0022] The control device 110 is communicatively connected to the energy storage device DES, each charging host CHGm, and each charging terminal EVm_n. The control device is used to execute the operation control method of the energy storage charging system. Alternatively, the energy storage device DES is communicatively connected to each charging terminal EVm_n. The energy storage device DES is also used to execute the operation control method of the energy storage charging system.

[0023] In one possible implementation, when the control device 110 establishes a global communication connection with the energy storage device DES, each charging host CHGm, and each charging terminal EVm_n, the data collected by each of the energy storage device DES, each charging host CHGm, and each charging terminal EVm_n can be synchronized to the control device 110 and the energy storage device DES. The control device 110 or the energy storage device DES can then use this data to support dynamic capacity expansion decisions and peak-valley arbitrage scheduling, i.e., execute the operation control method of the energy storage charging system.

[0024] The charging host CHGm is a centralized power conversion and distribution device in the energy storage charging system 100. It converts the electrical energy provided by the preset grid or the energy storage device DES into controllable DC power and distributes it to multiple charging terminals EVm_n. The charging terminal EVm_n is an execution unit that is directly connected to the preset charging equipment (such as an electric vehicle). It is controlled by the power distribution of the charging host CHGm to realize the transmission of electrical energy to the battery of the preset charging equipment.

[0025] It should be noted that the control device 110 and the energy storage device DES can be flexibly switched according to the needs of the scenario. For example, in complex scenarios (such as multiple terminals and high power demand), the control device 110 centrally coordinates the interaction between the energy storage device DES, each charging host CHGm, and each charging terminal EVm_n to achieve global optimal scheduling. In simple scenarios (such as a small number of terminals and low power demand), the energy storage device DES directly communicates with each charging terminal EVm_n and executes control, simplifying the logic and reducing the complexity of energy storage charging. This flexibility allows the energy storage charging system to adapt to charging needs of different scales (such as small charging piles and large charging stations) and different types (such as electric vehicles). In addition, it should be noted that, in order to clarify the implementation of the technical solution, the following embodiments all use the control device 110 as the execution subject to illustrate the operation control method of the energy storage charging system.

[0026] Continue to refer to Figure 1 The control device 110 is also communicatively connected to meter A to obtain the real-time operating power Pow_pcc_run and the preset maximum operating power Pow_pcc_set_max of the PCC (Point of Common Coupling). The PCC can be understood as the preset electrical connection point between the power grid and the energy storage charging system. When the real-time operating power Pow_pcc_run of the PCC is detected to be greater than the preset maximum operating power Pow_pcc_set_max, the energy storage charging system 100 must forcibly trigger the energy storage device DES to perform the following actions: proportionally reduce the charging power of the energy storage device DES or immediately switch the energy storage device DES to discharge mode; simultaneously, the control device 110 sends a load reduction command to the charging host CHGm to achieve coordinated power control of multiple devices. The preset maximum operating power Pow_pcc_set_max can be selected according to actual conditions.

[0027] It should be noted that in the energy storage charging system provided in this application, the energy storage device DES can be used as a backup power source. When the preset grid failure or the preset input power line is interrupted, the energy storage device DES can directly supply power to each charging terminal EVm_n, thus avoiding the interruption of charging services.

[0028] The energy storage charging system provided in this application can consist of a control device, an energy storage device, at least one charging host, and charging terminals connected to each charging host. Both the energy storage device and the charging host are connected to a preset input power line. The control device is communicatively connected to the energy storage device and each charging terminal, and is used to execute the operation control method of the energy storage charging system. Alternatively, the energy storage device is communicatively connected to each charging terminal, and is also used to execute the operation control method of the energy storage charging system to compensate for the power shortage of the charging host in real time, share the grid load, and smooth power fluctuations. Therefore, the control device or energy storage device in this application, through communication with the charging terminals, obtains real-time charging demand, dynamically adjusts the output strategy, avoids the impact of concentrated high-power charging on the preset grid, and improves the compatibility of the energy storage charging system with the preset grid.

[0029] Optionally, this application also provides a control device 110. Figure 2 This is a schematic diagram of a control device provided in an embodiment of this application. Figure 2 As shown, the control device 110 may include a processor 111 and a memory 112.

[0030] The memory 112 stores machine-executable instructions that can be executed by the processor 111. That is, when the control device 110 is running, the aforementioned machine-executable instructions are executed. The processor 111 and the memory 112 communicate via a bus. The processor 111 can execute machine-executable instructions to implement the operation control method of the energy storage charging system.

[0031] The memory 112, processor 111, and bus components are electrically connected directly or indirectly to achieve data transmission or interaction. For example, these components can be electrically connected to each other through one or more communication buses or signal lines. The memory 112 can be, but is not limited to, Random Access Memory (RAM), Read Only Memory (ROM), Programmable Read-Only Memory (PROM), Erasable Programmable Read-Only Memory (EPROM), Electrically Erasable Programmable Read-Only Memory (EEPROM), etc.

[0032] The operation control method for the energy storage charging system provided in this application embodiment can be executed by the processor in the control device 110. Figure 3 A flowchart illustrating an operation control method for an energy storage charging system provided in this application embodiment. Figure 1 .like Figure 3 As shown, the method may include: S201. Obtain historical charging power data of each charging terminal in the energy storage charging system within a preset historical time period.

[0033] The preset historical time period can be selected according to the actual situation. For example, the preset historical time period can be selected as the peak period, peak period, valley period, normal period, valley period, etc.

[0034] For example, Figure 4 This is a schematic diagram illustrating a charging and discharging operation control strategy for an energy storage and charging system based on peak-valley electricity price differences, provided as an embodiment of this application. Figure 4 As shown, within a preset historical time period, the energy storage device DES executes the following charging and discharging strategies: During the off-peak period ①, charging operations are prioritized to store energy using low-cost electricity; during the peak period ②, it switches to discharging mode to release electricity and participate in peak-valley arbitrage; Special operating condition response mechanism: If the total power of the charging load (i.e., the total charging demand power data) is detected to be close to or exceed the preset maximum operating power Pow_pcc_set_max (i.e., ∑Pow_evmn_need≥Pow_pcc_set_max) during the charging period ①, the energy storage device DES is forced to reduce the charging power (prioritizing the power supply to the charging terminal EVm_n) or switch to discharging mode (directly compensating for the power gap and realizing dynamic capacity expansion).

[0035] In one possible implementation, refer to Figure 1 Each charging terminal EVm_n is connected to the control device to transmit the data collected by each charging terminal EVm_n to the control device. This allows the control device to obtain the historical charging operation power data Pow_evmn_run (i.e., actual output power) and historical charging demand power data Pow_evmn_need (i.e., the preset charging equipment request power or the target power allocated by the energy storage charging system) of each charging terminal EVm_n in the energy storage charging system within a preset historical time period.

[0036] It should be noted that the historical charging operation power data Pow_evmn_run represents the charging operation power of the mn-th preset charging device (such as an electric vehicle), where m refers to the charging host and n refers to the charging terminal. When m=1 and n=1, it refers to the first charging terminal EV1_1 of the first charging host CHG1. Similarly, the historical charging demand power data Pow_evmn_need represents the charging demand power of the mn-th preset charging device (such as an electric vehicle).

[0037] Additionally, it should be noted that, under normal circumstances, the actual charging power data Pow_evmn_run of the charging terminal EVm_n never exceeds its charging demand power data Pow_evmn_need, i.e., 0 ≤ Pow_evmn_run ≤ Pow_evmn_need. Specifically, when the charging power data Pow_evmn_run of the charging terminal EVm_n is equal to its charging demand power data Pow_evmn_need, it indicates that the charging load is under normal conditions, i.e., there is no overload. At this time, the real-time operating power Pow_pcc_run of the PCC point does not exceed the preset maximum operating power Pow_pcc_set_max, which can meet the current charging demand.

[0038] When the charging power data Pow_evmn_run of the charging terminal EVm_n is less than its charging demand power data Pow_evmn_need, it means that the charging load has been overloaded. At this time, the real-time operating power Pow_pcc_run of the PCC point is likely approaching or exceeding the preset maximum operating power Pow_pcc_set_max. To avoid triggering the grid protection mechanism or causing a fault in the energy storage charging system, the energy storage charging system needs to activate power limiting control: that is, by forcibly reducing the operating power of some charging terminals EVm_n, it ensures that the real-time operating power Pow_pcc_run of the PCC point is strictly controlled within the preset maximum operating power Pow_pcc_set_max range. At this time, the charging power data Pow_evmn_run of the charging terminal EVm_n is forced to be lower than its charging demand power data Pow_pcc_set_max due to the regulation of the energy storage charging system, and cannot meet the original charging demand of the preset charging equipment (such as electric vehicles), and the whole system is in a power limiting operation state.

[0039] S202. Based on the historical charging power data of each charging terminal and the corresponding historical charging demand power data, determine the reserved capacity of the energy storage device in the energy storage charging system.

[0040] The reserved capacity WhX_diff_max is used for capacity expansion control of the energy storage device DES. That is, the reserved capacity WhX_diff_max is the capacity that does not participate in the discharge operation; it is also the minimum energy reserve that the energy storage device DES must have, to ensure that in historical extreme scenarios, the energy storage device DES can fill the gap through continuous discharge and avoid power limitation.

[0041] In one possible implementation, constrained by the hardware and control strategies of the energy storage charging system, the historical charging operating power data Pow_evmn_run never exceeds its historical charging demand power data Pow_evmn_need, i.e., 0 ≤ Pow_evmn_run ≤ Pow_evmn_need. Then, based on the historical charging operating power data Pow_evmn_run and the corresponding historical charging demand power data Pow_evmn_need for each charging terminal EVm_n, the capacity of the energy storage device DES can be divided into: reserved capacity WhX_diff_max and operating capacity. The reserved capacity WhX_diff_max is dynamically generated based on the power deviation of each charging terminal EVm_n and is used to respond to the dynamic expansion needs of the energy storage charging system. The operating capacity, or dispatchable capacity, is the remaining portion of the total capacity of the energy storage device DES after deducting the reserved capacity WhX_diff_max, used to execute peak-valley arbitrage strategies to obtain electricity price difference revenue.

[0042] The operation control method for the energy storage charging system provided in this application obtains historical charging power data of each charging terminal in the energy storage charging system within a preset historical time period. Then, based on the historical charging power data of each charging terminal and the corresponding historical charging demand power data, the reserved capacity of the energy storage device in the energy storage charging system is determined. This enables capacity expansion control of the energy storage device, preventing excessive reservation of the energy storage device from causing a preset grid backflow accident, and thus adapting to dynamic adjustments in distribution capacity, improving the utilization efficiency of the energy storage charging system. Therefore, this application divides the energy storage capacity into working capacity and reserved capacity. The working capacity (schedulable capacity) is used to execute peak-valley arbitrage strategies to obtain electricity price difference revenue, achieving the economic efficiency of the energy storage charging system. The reserved capacity is used to adapt to dynamic adjustments in distribution capacity, transforming the implicit power shortage problem into calculable reserved capacity, making the expansion target clear and quantifiable. Furthermore, capacity segmentation achieves the dual-objective optimization of arbitrage revenue and expansion guarantee.

[0043] Figure 5 A flowchart illustrating an operation control method for an energy storage charging system provided in this application embodiment. Figure 2 .like Figure 5 As shown, the method described above, which determines the reserved capacity of the energy storage device in the energy storage charging system based on the historical charging power data of each charging terminal and the corresponding historical charging demand power data, may include: S301. Based on the historical charging operation power data of each charging terminal and the corresponding historical charging demand power data, determine the first total deviation power of the energy storage charging system.

[0044] In one possible implementation, the first total deviation power ∑Pow_diff of the energy storage charging system is determined only when the historical charging operation power data Pow_evmn_run of each charging terminal EVm_n is less than the historical charging demand power data Pow_evmn_need. This is based on the historical charging operation power data Pow_evmn_run of each charging terminal EVm_n and the corresponding historical charging demand power data Pow_evmn_need.

[0045] S302. Determine the expansion power requirement of the energy storage device based on the first total deviation power.

[0046] In one possible implementation, the first total deviation power ∑Pow_diff is determined as the expansion power requirement of the energy storage device DES. Wherein, if the first total deviation power ∑Pow_diff A value of 0 indicates that there is no power gap in the historical charging power data, meaning the first total deviation power ∑Pow_diff equals 0, and no capacity expansion is needed; if the first total deviation power ∑Pow_diff 0 means that the gap needs to be filled by either discharging the energy storage device DES or expanding the grid capacity in advance. Prioritizing the expansion of the energy storage device DES is the best option, as it is cheaper and faster to implement.

[0047] S303. Determine the reserved capacity based on the power required for expansion.

[0048] In one possible implementation, the power demand for expansion is converted into capacity demand, taking into account the duration of the shortfall, and then the reserved capacity WhX_diff_max is determined.

[0049] The operation control method for the energy storage charging system provided in this application determines the first total deviation power of the energy storage charging system based on the historical charging power data of each charging terminal and the corresponding historical charging demand power data; determines the expansion demand power of the energy storage device based on the first total deviation power; and determines the reserved capacity based on the expansion demand power. Thus, this application achieves the conversion of power gap into energy gap through the technical path of first total deviation power → expansion demand power → reserved capacity, ensuring that the energy storage device meets both instantaneous power demand and duration requirements; and establishes a closed loop from historical charging data to real-time control and future planning, realizing dynamic capacity expansion.

[0050] Figure 6 A flowchart illustrating an operation control method for an energy storage charging system provided in this application embodiment. Figure 3 .like Figure 6 As shown, the method described above, which determines the first total deviation power of the energy storage charging system based on the historical charging operation power data of each charging terminal and the corresponding historical charging demand power data, may include: S401. Based on the historical charging operation power data of each charging terminal and the corresponding historical charging demand power data, determine the historical total charging operation power and historical total charging demand power of the energy storage charging system.

[0051] In one possible implementation, the historical charging operation power data Pow_evmn_run of each charging terminal EVm_n is summed to determine the historical total charging operation power ∑Pow_evmn_run of the energy storage charging system; and the historical charging demand power data Pow_evmn_need corresponding to each charging terminal EVm_n is summed to obtain the historical total charging demand power ∑Pow_evmn_need of the energy storage charging system.

[0052] S402. If the total historical charging power is less than the total historical charging demand power, then the first total deviation power is calculated based on the power difference between the preset maximum operating power in the energy storage charging system and the total historical charging demand power.

[0053] In one possible implementation, the historical total charging power ∑Pow_evmn_run is less than the historical total charging demand power ∑Pow_evmn_need, that is, the sum of the charging power of all preset charging devices (such as electric vehicles) < the sum of the charging demand power of all preset charging devices (such as electric vehicles). This indicates that there is a power gap in the historical total power data of the energy storage charging system within the preset historical time period, that is, the total charging demand power ∑Pow_evmn_need is not met, reflecting the actual power compensation demand of the energy storage charging system under overload scenarios. Therefore, it is necessary to limit the total charging power to within the preset maximum operating power Pow_pcc_set_max. Then, based on the preset maximum operating power Pow_pcc_set_max and the historical total charging demand power ∑Pow_evmn_need in the energy storage charging system, the first total deviation power ∑Pow_diff1 is calculated according to the following formula (1).

[0054] ∑Pow_diff1=Pow_pcc_set_max-∑Pow_evmn_need formula (1) The formula (1) above is used to represent the portion of the total charging demand that exceeds the preset grid allowable capacity, i.e. the preset remaining available power of the distribution network.

[0055] For example, such as Figure 7 As shown, Figure 7 A schematic diagram illustrating the total charging power deviation and energy demand provided in this application embodiment. Figure 1 In combination with the above Figure 4Charge and discharge operation control strategy. ① represents the charging period of the energy storage device DES during the valley and flat time periods, and ② represents the discharging period of the energy storage device DES during the peak time period. In the preset historical time period t0~t2①, if the total historical charging operation power ∑Pow_evmn_run1 is less than the total historical charging demand power ∑Pow_evmn_need1, then according to the above formula (1), we get arrive The first total deviation power ∑Pow_diff1, that is, the first total deviation power ∑Pow_diff1 = Pow_pcc_set_max - ∑Pow_evmn_need1. This first total deviation power ∑Pow_diff1 is used to indicate that the energy storage device DES needs to discharge to achieve capacity expansion.

[0056] Similarly, continue to refer to Figure 7 , in the preset historical time period t2~t3①, if the total historical charging operation power ∑Pow_evmn_run2 is less than the total historical charging demand power ∑Pow_evmn_need2, and both are less than the preset maximum operation power Pow_pcc_set_max, that is, ∑Pow_evmn_run2 < ∑Pow_evmn_need2 < Pow_pcc_set_max. Therefore, in the time period t2~t3②, since the total historical charging demand power ∑Pow_evmn_need2 does not exceed the preset maximum operation power Pow_pcc_set_max, the charging power is satisfied. At this time, according to the above formula (1), we get arrive The first total deviation power ∑Pow_diff1, that is, the first total deviation power ∑Pow_diff1 = Pow_pcc_set_max - ∑Pow_evmn_need2. This first total deviation power ∑Pow_diff1 is used to indicate that the energy storage device DES can charge to improve the utilization rate of the energy storage charging system.

[0057] Exemplarily, the present application also provides a schematic diagram of the charging power deviation and energy demand. As Figure 8 shown, Figure 8 is a schematic diagram of the total charging power deviation and energy demand provided by an embodiment of the present application Figure 2 . Combining the above Figure 4Charge and discharge operation control strategy. ① represents the charging period of the energy storage device DES during the valley and flat time periods, and ② represents the discharging period of the energy storage device DES during the peak time period. During the preset historical time period t1~t2①, if the total historical charging operation power ∑Pow_evmn_run1 is less than the total historical charging demand power ∑Pow_evmn_need1, then according to the above formula (1), the first total deviation power ∑Pow_diff1 is obtained, that is, the first total deviation power ∑Pow_diff1 = Pow_pcc_set_max - ∑Pow_evmn_need1. This first total deviation power ∑Pow_diff1 is used to indicate that the energy storage device DES needs to discharge to achieve capacity expansion.

[0058] During the preset historical time period t0~t1②, the total historical charging operation power ∑Pow_evmn_run2 is less than the total historical charging demand power ∑Pow_evmn_need2, and both are less than the preset maximum operation power Pow_pcc_set_max, that is, ∑Pow_evmn_run2 < ∑Pow_evmn_need<Pow_pcc_set_max. Therefore, during the time period t2~t3②, since the total historical charging demand power ∑Pow_evmn_need2 does not exceed the preset maximum operation power Pow_pcc_set_max, the charging power is satisfied. At this time, according to the above formula (1), arrive The first total deviation power ∑Pow_diff2, that is, the first total deviation power ∑Pow_diff1 = Pow_pcc_set_max - ∑Pow_evmn_need2. This first total deviation power ∑Pow_diff2 is used to indicate that the energy storage device DES can be charged to improve the utilization rate of the energy storage charging system.

[0059] To sum up, Figure 7 and Figure 8 The difference is that, Figure 7 Do not charge during the preset historical time period t0~t1, and standby to wait for the capacity expansion demand to be realized; Figure 8 Charge first during the preset historical time period t0~t1 to optimize the utilization rate of the reserved capacity, thereby reducing the configuration requirement of the total energy storage capacity.

[0060] The operation control method for the energy storage charging system provided in this application determines the historical total charging power and historical total charging demand power of the energy storage charging system based on the historical charging power data of each charging terminal and the corresponding historical charging demand power data. If the historical total charging power is less than the historical total charging demand power, a first total deviation power is calculated based on the power difference between the preset maximum operating power of the energy storage charging system and the historical total charging demand power. Therefore, this application can intuitively assess the degree of historical overload based on the first total deviation power, providing a core basis for the capacity design of energy storage devices and avoiding problems of excessive or insufficient reserves. Simultaneously, the first total deviation power can also directly reflect the power gap that energy storage needs to fill. The energy storage charging system can prioritize the use of stored energy to fill this gap, rather than relying on preset grid capacity expansion, avoiding safety hazards caused by overload. Furthermore, through historical first total deviation power distribution analysis, the energy storage charging system can optimize power limiting priorities (such as prioritizing the limiting of charging terminals with low charging efficiency requirements), minimizing the impact on user experience.

[0061] Optionally, determining the expansion power requirement of the energy storage device based on the first total deviation power in the above method includes: The first total deviation power is determined as the expansion demand power.

[0062] In one possible implementation, the first total deviation power ∑Pow_diff is directly determined as the expansion demand power of the energy storage device DES. Here, the first total deviation power ∑Pow_diff is the difference between the historical total charging demand power ∑Pow_evmn_need1 and the preset maximum operating power Pow_pcc_set_max, reflecting the unmet rigid power demand caused by grid capacity limitations (such as PCC point power constraints) in historical scenarios. Using this as the expansion demand power achieves precise expansion requirements, ensuring that the energy storage charging system no longer triggers power limiting under equal or higher loads, thus improving the reliability and operational safety of the energy storage charging system.

[0063] or, Figure 9 A flowchart illustrating an operation control method for an energy storage charging system provided in this application embodiment. Figure 4 .like Figure 9 As shown, the method described above determines the expansion power requirement of the energy storage device based on the first total deviation power, including: S501. If the first total deviation power is less than or equal to the first preset deviation power threshold, then the first historical charging deviation power of each charging terminal is calculated based on the historical charging operation power data of each charging terminal and the corresponding historical charging demand power data.

[0064] The first preset deviation power threshold Pow_evmn_limit1 can be selected according to the actual situation.

[0065] In one possible implementation, if the first total deviation power ∑Pow_dif1f is less than or equal to the first preset deviation power threshold Pow_evmn_limit1, i.e. ∑Pow_diff1(Pow_pcc_set_max-∑Pow_evmn_need)≤Pow_evmn_limit1, it means that the energy storage charging system is overloaded. The preset flag bit Flag_Diff_cal of the energy storage charging system is controlled to be 1, and the first historical charging deviation power Pow_evmn_diff1 of each charging terminal EVm_n is calculated according to the following formula (2) based on the historical charging operation power data Pow_evmn_run of each charging terminal EVm_n and the corresponding historical charging demand power data Pow_evmn_need.

[0066] Pow_evmn_diff1=Pow_evmn_need-Pow_evmn_run formula (2) In the above formula (2), the first historical charging deviation power Pow_evmn_diff1 represents the unmet charging power demand of the energy storage charging system, which exceeds the limit and is overloaded, requiring the activation of power limiting control: that is, by forcibly de-rating some charging terminals EVm_n, ensuring that the real-time operating power Pow_pcc_run of the PCC point is strictly controlled within the preset maximum operating power Pow_pcc_set_max range. Or, the energy storage device DES is controlled to be in discharge mode. In other words, the first historical charging deviation power Pow_evmn_diff1 is used to reflect the instantaneous power gap of a single charging terminal.

[0067] If the first total deviation power ∑Pow_diff is greater than the first preset deviation power threshold Pow_evmn_limit1, that is, ∑Pow_diff(Pow_pcc_set_max-∑Pow_evmn_need)>Pow_evmn_limit1, it means that the energy storage charging system meets the charging demand, and the preset flag bit Flag_Diff_cal of the energy storage charging system is controlled to be 0, and the charging service continues.

[0068] For example, Figure 10 This is a schematic diagram illustrating the charging capacity and power deviation of an energy storage charging system provided in an embodiment of this application. Figure 10 As shown, the rechargeable power Pow_des_chg_allow is calculated using the following formula (3) based on the PCC's preset maximum operating power Pow_pcc_set_max and the PCC's real-time operating power Pow_pcc_run.

[0069] Pow_des_chg_allow=Pow_pcc_set_max-Pow_pcc_run formula (3) In the above formula (3), the rechargeable power Pow_des_chg_allow is used to represent the power that the energy storage device DES can be charged.

[0070] S502. Determine the expansion power requirement based on the first historical charging deviation power of each charging terminal.

[0071] In one possible implementation, the first historical charging deviation power ∑Pow_evmn_diff of each charging terminal EVm_n is determined as the expansion requirement power of the energy storage device DES based on the first historical charging deviation power ∑Pow_evmn_diff of each charging terminal EVm_n.

[0072] The operation control method for the energy storage charging system provided in this application determines a first total deviation power as the expansion demand power; or, if the first total deviation power is less than or equal to a first preset deviation power threshold, it indicates that the overall load overload is relatively mild, but there may be local overload problems where some charging terminals frequently experience power shortages. Then, based on the historical charging operation power data and corresponding historical charging demand power data of each charging terminal, the first historical charging deviation power of each charging terminal is calculated; based on the first historical charging deviation power of each charging terminal, the expansion demand power is determined to centrally allocate the expansion capacity to the charging terminals that actually need it, avoiding ineffective expansion and achieving dynamic adjustment of expansion demand. Therefore, this application can achieve precise expansion demand, improving the reliability and operational safety of the energy storage charging system.

[0073] Figure 11 A flowchart illustrating an operation control method for an energy storage charging system provided in this application embodiment. Figure 5 .like Figure 11 As shown, the method described above, which determines the expansion power requirement based on the first historical charging deviation power of each charging terminal, may include: S601. Based on the historical charging power data of each charging terminal and the preset maximum operating power of the charging terminal, determine the second historical charging deviation power of each charging terminal.

[0074] The preset maximum operating power of the charging terminal, Pow_evmn_set_max, can be selected according to the actual situation.

[0075] In one possible implementation, the second historical charging deviation power Pow_evmn_diff2 of each charging terminal is determined according to the following formula (4) based on the historical charging operation power data Pow_evmn_run of each charging terminal EVm_n and the preset maximum operating power of the charging terminal Pow_evmn_set_max.

[0076] Pow_evmn_diff2=Pow_evmn_set_max-Pow_evmn_run formula (4) Among them, the second historical charging deviation power Pow_evmn_diff2 is used to represent the unutilized expansion potential of a single charging terminal, providing a safe redundancy space for dynamic expansion.

[0077] S602. Determine the first historical charging deviation power and the second historical charging deviation power of each charging terminal, and whether they meet the corresponding deviation power conditions.

[0078] In one possible implementation, it is determined whether the first historical charging deviation power Pow_evmn_diff1 and the second historical charging deviation power Pow_evmn_diff2 of each charging terminal EVm_n meet the corresponding deviation power condition. If yes, then step S603 is executed; otherwise, power limiting is applied to each charging terminal EVm_n or the energy storage device DES is controlled to discharge.

[0079] S603. Determine the target charging terminal from each charging terminal whose first historical charging deviation power and second historical charging deviation power both meet the corresponding deviation power conditions.

[0080] S604. Calculate the second total deviation power of the energy storage charging system as the expansion demand power based on the sum of the first historical charging deviation power of each target charging terminal.

[0081] In one possible implementation, the first historical charging deviation power Pow_evmn_diff1 and the second historical charging deviation power Pow_evmn_diff2 must simultaneously satisfy the corresponding deviation power conditions. Then, target charging terminals from each charging terminal are determined whose first historical charging deviation power Pow_evmn_diff1 and the second historical charging deviation power Pow_evmn_diff2 both satisfy the corresponding deviation power conditions. Then, based on the sum of the first historical charging deviation power Pow_evmn_diff1 of each target charging terminal, the second total deviation power ∑Pow_diff2 of the energy storage charging system is calculated according to the following formula (5).

[0082] ∑Pow_diff2=∑Pow_evmn_diff1 formula (5) Among them, the second total deviation power ∑Pow_diff2 obtained by the above formula (5) can be used as the expansion demand power of the energy storage device DES.

[0083] The operation control method for the energy storage charging system provided in this application determines the second historical charging deviation power of each charging terminal based on its historical charging power data and a preset maximum operating power. Then, it determines whether the first and second historical charging deviation powers of each charging terminal meet the corresponding deviation power conditions. If the deviation power conditions are met, it identifies target charging terminals from among the charging terminals whose first and second historical charging deviation powers both meet the corresponding deviation power conditions. Finally, it calculates the second total deviation power of the energy storage charging system based on the sum of the first historical charging deviation powers of all target charging terminals. This second total deviation power can be used as the expansion power requirement for the energy storage device. Therefore, this application can achieve precise expansion requirements, ensuring that each charging terminal in the energy storage charging system no longer triggers power limiting under the same or higher loads, thus improving the reliability and operational safety of the energy storage charging system.

[0084] Figure 12 A flowchart illustrating an operation control method for an energy storage charging system provided in this application embodiment. Figure 6 .like Figure 12 As shown, the method described above determines whether the first historical charging deviation power and the second historical charging deviation power of each charging terminal meet the corresponding deviation power conditions, including: S701. Determine whether the first historical charging deviation power of each charging terminal is greater than or equal to the second preset deviation power threshold.

[0085] The second preset deviation power threshold P_ev_limit2 can be selected according to the actual situation. It should be noted that the second preset deviation power threshold P_ev_limit2 is less than the first preset deviation power threshold Pow_evmn_limit1.

[0086] S702. If the first historical charging deviation power of the first charging terminal in each charging terminal is greater than or equal to the second preset deviation power threshold, then it is determined that the first historical charging deviation power of the first charging terminal meets the corresponding deviation power condition.

[0087] In one possible implementation, it is determined whether the first historical charging deviation power Pow_evmn_diff1 of the first charging terminal EVm_1 in each charging terminal EVm_n is greater than or equal to the second preset deviation power threshold P_ev_limit2. If yes, that is, the first historical charging deviation power Pow_evmn_diff1 of the first charging terminal EVm_1 in each charging terminal EVm_n is greater than or equal to the second preset deviation power threshold P_ev_limit2, then output 1, indicating that the first charging terminal EVm_1 in each charging terminal EVm_n meets the corresponding deviation power condition, that is, meets the high-frequency power gap. If not, that is, the first historical charging deviation power Pow_evmn_diff1 of the first charging terminal EVm_1 in each charging terminal EVm_n is greater than the second preset deviation power threshold P_ev_limit2, then output 0, indicating that the first charging terminal EVm_1 in each charging terminal EVm_n meets the charging demand, and the charging operation continues.

[0088] S703. Determine whether the second historical charging deviation power of each charging terminal is greater than or equal to the third preset deviation power threshold.

[0089] The third preset deviation power threshold P_ev_limit3 can be selected according to the actual situation. It should be noted that the third preset deviation power threshold P_ev_limit3 is less than the first preset deviation power threshold Pow_evmn_limit1; the third preset deviation power threshold P_ev_limit3 may be the same as or different from the second preset deviation power threshold P_ev_limit2.

[0090] S704. If the second historical charging deviation power of the second charging terminal in each charging terminal is greater than or equal to the third preset deviation power threshold, then it is determined that the second historical charging deviation power of the second charging terminal meets the corresponding deviation power condition.

[0091] In one possible implementation, it is determined whether the second historical charging deviation power Pow_evmn_diff2 of the second charging terminal EVm_2 in each charging terminal EVm_n is greater than or equal to the third preset deviation power threshold P_ev_limit3. If yes, that is, the second historical charging deviation power Pow_evmn_diff2 of the first charging terminal EVm_1 in each charging terminal EVm_n is greater than or equal to the third preset deviation power threshold P_ev_limit3, then output 1, indicating that the second historical charging deviation power Pow_evmn_diff2 of the second charging terminal EVm_2 in each charging terminal EVm_n meets the corresponding deviation power condition, that is, the charging demand is met. If not, that is, the second historical charging deviation power Pow_evmn_diff2 of the second charging terminal EVm_2 in each charging terminal EVm_n is greater than the third preset deviation power threshold P_ev_limit3, then output 0, indicating that the second charging terminal EVm_2 in each charging terminal EVm_n does not meet the charging demand, and power limiting or switching the energy storage device DES to discharge mode needs to be performed.

[0092] The operation control method for the energy storage charging system provided in this application determines whether the first historical charging deviation power of each charging terminal is greater than or equal to a second preset deviation power threshold; if the first historical charging deviation power of the first charging terminal is greater than or equal to the second preset deviation power threshold, then the first historical charging deviation power of the first charging terminal is determined to meet the corresponding deviation power condition; it also determines whether the second historical charging deviation power of each charging terminal is greater than or equal to a third preset deviation power threshold; if the second historical charging deviation power of the second charging terminal is greater than or equal to the third preset deviation power threshold, then the second historical charging deviation power of the second charging terminal is determined to meet the corresponding deviation power condition. Therefore, this application can achieve precise capacity expansion requirements and improve the reliability and operational safety of the energy storage charging system.

[0093] To facilitate understanding of the above-described operation control method for the energy storage charging system, this application also provides an example of obtaining the second total deviation power ∑Pow_diff2 of the energy storage charging system, which will be further explained below with reference to the accompanying drawings. Figure 13 This is a schematic diagram illustrating the discharge capacity and power deviation of an energy storage charging system provided in an embodiment of this application. Figure 13As shown, firstly, based on the historical charging operation power data Pow_evmn_run and the corresponding historical charging demand power data Pow_evmn_need of each charging terminal EVm_n, the first historical charging deviation power Pow_evmn_diff1 of each charging terminal EVm_n is calculated according to the above formula (2). Then, it is determined whether the first historical charging deviation power Pow_evmn_diff1 of the first charging terminal EVm_1 in each charging terminal EVm_n is greater than or equal to the second preset deviation power threshold P_ev_limit2; then, based on the historical charging operation power data Pow_evmn_run and the preset maximum operating power Pow_evmn_set_max of each charging terminal EVm_n, the second historical charging deviation power Pow_evmn_diff2 of each charging terminal is determined according to the above formula (3), and it is determined whether the second historical charging deviation power Pow_evmn_diff2 of the second charging terminal EVm_2 in each charging terminal EVm_n is greater than or equal to the third preset deviation power threshold P_ev_limit2. Let the deviation power threshold be P_ev_limit3. When the above two judgment conditions are met at the same time, that is, the first historical charging deviation power Pow_evmn_diff1 is greater than or equal to the second preset deviation power threshold P_ev_limit2, and the second historical charging deviation power Pow_evmn_diff2 is greater than or equal to the third preset deviation power threshold P_ev_limit3, then the target charging terminal from each charging terminal is determined to satisfy the corresponding deviation power conditions for both the first historical charging deviation power and the second historical charging deviation power. The first historical charging deviation power of each target charging terminal is summed, that is, the second total deviation power ∑Pow_diff2 of the energy storage charging system is calculated according to the above formula (3).

[0094] The operation control method for the energy storage charging system provided in this application calculates the first historical charging deviation power of each charging terminal based on its historical charging operation power data and corresponding historical charging demand power data. It then determines whether the first historical charging deviation power of the first charging terminal is greater than or equal to a second preset deviation power threshold. Next, based on the historical charging operation power data and a preset maximum operating power for each charging terminal, it determines the second historical charging deviation power of each charging terminal and whether the second historical charging deviation power of the second charging terminal is greater than or equal to a third preset deviation power threshold. When both conditions are met simultaneously, target charging terminals whose first and second historical charging deviation powers both meet the corresponding deviation power conditions are identified. The first historical charging deviation power of each target charging terminal is then summed to obtain the second total deviation power of the energy storage charging system. Therefore, this application ensures accurate expansion requirements and improves the reliability and operational safety of the energy storage charging system by screening target charging terminals from two dimensions and calculating the second total deviation power.

[0095] Figure 14 A flowchart illustrating an operation control method for an energy storage charging system provided in this application embodiment. Figure 7 .like Figure 14 As shown, the above method determines the reserved capacity based on the expansion demand power, including: S901. The expansion demand power for multiple time periods within a preset historical time period is integrated over time to obtain the total deviation capacity for multiple time periods.

[0096] Among them, multiple time periods within the preset historical time period can be represented by Time_control_setp.

[0097] In one possible implementation, continue to refer to the above. Figure 10 The rechargeable power Pow_des_chg_allow is integrated over multiple time periods Time_control_setp within a preset historical time period, and the rechargeable capacity Wh_des_chg_allow within multiple time periods Time_control_setp is obtained according to the following formula (6).

[0098] Wh_des_chg_allow Formula (6) Where i represents any moment in the multiple time periods Time_control_setp.

[0099] The rechargeable capacity Wh_des_chg_allow in the above formula (6) represents the rechargeable capacity of the energy storage device DES.

[0100] Continue to refer to the above. Figure 13 The second total deviation power ∑Pow_diff2 of the energy storage charging system is integrated over multiple time periods (Time_control_setp) within a preset historical time period, i.e., the deviation capacity Wh_evmn_diff within multiple time periods (Time_control_setp) is obtained according to the following formula (7).

[0101] Wh_evmn_diff Formula (7) In the above formula (7), the deviation capacity Wh_evmn_diff is used to represent the capacity that the energy storage device DES needs to discharge, so as to realize dynamic capacity expansion according to the deviation capacity.

[0102] Then, based on the rechargeable capacity Wh_des_chg_allow in formula (6) and the deviation capacity Wh_evmn_diff in formula (7), the total deviation capacity WhX_diff for multiple time periods of Time_control_setp is determined by formula (8).

[0103] WhX_diff=Wh_evmn_diff+Wh_des_chg_allow formula (8) In the total deviation capacity WhX_diff, X=i. This total deviation capacity WhX_diff represents the total energy capacity that needs to be compensated during this time period.

[0104] S902. Determine the maximum deviation capacity from the total deviation capacity of multiple time periods as the reserved capacity.

[0105] For example, Figure 15 This is a schematic diagram illustrating the reserved capacity and discharge cutoff state of charge parameters of an energy storage charging system provided in an embodiment of this application. Figure 15 As shown, it is determined whether the difference between the total deviation capacity WhX_diff and the preset initial total deviation capacity Wh0_diff is greater than or equal to 0. If so, the energy storage charging system first performs a charging operation to obtain the first total deviation capacity WhX_diff_1; if not, the difference between the total deviation capacity WhX_diff and the preset initial total deviation capacity Wh0_diff is less than 0, the energy storage charging system first performs a charging operation to obtain the second total deviation capacity WhX_diff_2. Then, the maximum value between the first total deviation capacity WhX_diff_1 and the second total deviation capacity WhX_diff_2 is calculated, that is, the maximum deviation capacity is determined from the total deviation capacities WhX_diff over multiple time periods as the reserved capacity WhX_diff_max.

[0106] Wherein, the first total deviation capacity WhX_diff_1 represents the multiple deviation capacities in the charging operations of Time_control_setp in multiple time periods within a preset historical time period; the second total deviation capacity WhX_diff_2 represents the multiple deviation capacities in the discharging operations of Time_control_setp in multiple time periods within a preset historical time period.

[0107] It should be noted that when determining the maximum deviation capacity as the reserved capacity WhX_diff_max from the total deviation capacity WhX_diff_ of multiple time periods, the cumulative deviation value of multiple charge and discharge time periods can be calculated separately, that is, the total deviation capacity WhX_diff of multiple charge and discharge time periods can be obtained. Then, a comparison is performed for each additional charge and discharge time period, and the larger value is taken as the reserved capacity WhX_diff_max.

[0108] The operation control method for the energy storage charging system provided in this application integrates the expansion demand power for multiple time periods within a preset historical time period to adapt to the load characteristics of different time periods, obtaining the total deviation capacity for multiple time periods. This supports dynamic energy storage scheduling and improves the efficiency of the energy storage charging system. The maximum deviation capacity is determined from the total deviation capacity of multiple time periods as the reserved capacity, and the maximum energy gap value across all time periods is taken as the system's reserved capacity. Therefore, this application can ensure power supply continuity in extreme overload scenarios, improve the reliability of the energy storage charging system, accurately quantify the energy gap, avoid the hidden risk of meeting power requirements but insufficient capacity, and thus avoid the dilemma of excessive redundancy and insufficient capacity.

[0109] Optionally, the operation control method of the above-mentioned energy storage charging system further includes: Based on the reserved capacity and the rated capacity of the energy storage device, determine the discharge cutoff state of charge parameters of the energy storage device.

[0110] The rated capacity WhX_diff_des_rate of the energy storage device can be selected according to the actual situation.

[0111] In one possible implementation, continue to refer to the above. Figure 15 Based on the reserved capacity WhX_diff_max and the rated capacity WhX_diff_des_rate of the energy storage device DES obtained above, the discharge cutoff charge state parameter SOC_des_deschg_stop of the energy storage device DES is obtained according to the following formula (9).

[0112] SOC_des_deschg_stop=1- Formula (9) Formula (9) above indicates that when the energy storage device DES discharges to the discharge cutoff state of charge parameter SOC_des_deschg_stop, it must stop working and reserve WhX_diff / WhX_diff_des_rate energy for capacity expansion needs.

[0113] It should be noted that after obtaining the discharge cutoff state of charge parameter SOC_des_deschg_stop of the energy storage device DES, the reserve power E_reserve of the energy storage device DES can be obtained by the following formula (10).

[0114] E_reserve=Eavailable Formula (10) Where Eavailable is the actual dischargeable energy of the current energy storage system. The above formula (10) is used to explain that when the discharge cutoff state of charge parameter SOC_des_deschg_stop of the energy storage device DES is known, the reserve power E_reserve of the energy storage device DES can be calculated, that is, the maximum safe reserve power E_reserve that the current energy storage system can provide to meet the needs of emergency power supply or grid frequency regulation.

[0115] The operation control method of the energy storage charging system provided in this application determines the discharge cutoff state of charge parameters of the energy storage device based on the reserved capacity and the rated capacity of the energy storage device, so as to ensure that the energy storage device always retains sufficient capacity for sudden demand during the discharge process, avoids over-discharge leading to battery damage, and thus improves the power supply reliability and emergency response capability of the energy storage charging system.

[0116] To facilitate understanding of the above-described operation control method for the energy storage charging system, this application also provides a flowchart example of the operation control method for the energy storage charging system, which will be further described below with reference to the accompanying drawings. Figure 16 A flowchart illustrating an operation control method for an energy storage charging system provided in this application embodiment. Figure 8 .like Figure 16 As shown in the illustration, the embodiments provided in this application provide... Figure 8 It may include: S1001. Determine the charging time period of the energy storage charging system.

[0117] Specifically, under normal circumstances, the charging time period of a day for the energy storage charging system is selected, that is, a preset historical time period of a day is selected for charging and discharging, as described above. Figure 4 The charging time period is divided.

[0118] S1002. Determine whether the first total deviation power of the energy storage charging system is less than or equal to the first preset deviation power threshold.

[0119] Specifically, the first total deviation power ∑Pow_diff1 is obtained according to the above formula (1), that is, ∑Pow_diff1=Pow_pcc_set_max-∑Pow_evmn_need. It is then determined whether the first total deviation power ∑Pow_diff1 of the energy storage charging system is less than or equal to the first preset deviation power threshold Pow_evmn_limit1. If yes, step S1003 is executed; otherwise, step S1004 is executed.

[0120] S1003. Calculate the demand response of the preset charging equipment.

[0121] Specifically, if the first total deviation power ∑Pow_diff of the energy storage charging system is less than or equal to the first preset deviation power threshold Pow_evmn_limit1, then the preset flag bit Flag_Diff_cal of the energy storage charging system is set to 1, and any of the following schemes is executed: Option 1 (Energy Storage and Charging System Level Calculation): Directly use the first total deviation power ∑Pow_diff1 as the expansion demand power, and then integrate the first total deviation power ∑Pow_diff1 over multiple time periods within a preset historical time period to obtain the deviation capacity Wh_evmn_diff.

[0122] Option 2 (Charging Terminal Level Calculation): Based on the historical charging operation power data Pow_evmn_run and the corresponding historical charging demand power data Pow_evmn_need of each charging terminal EVm_n, determine the first historical charging deviation power Pow_evmn_diff1 of each charging terminal EVm_n according to the above formula (2); then, based on the historical charging operation power data Pow_evmn_run and the preset maximum operating power Pow_evmn_set_max of each charging terminal EVm_n, determine the second historical charging deviation power Pow_evmn_diff2 of each charging terminal according to the above formula (4), and then determine... Determine whether the first historical charging deviation power Pow_evmn_diff1 and the second historical charging deviation power Pow_evmn_diff2 of each charging terminal EVm_n simultaneously meet the corresponding deviation power conditions. If they do, then determine the target charging terminal from each charging terminal whose first historical charging deviation power Pow_evmn_diff1 and the second historical charging deviation power Pow_evmn_diff2 both meet the corresponding deviation power conditions. Then, based on the sum of the first historical charging deviation power Pow_evmn_diff1 of each target charging terminal, obtain the second total deviation power ∑Pow_diff2 of the energy storage charging system according to the above formula (5). Then, integrate the second total deviation power ∑Pow_diff2 over multiple time periods within a preset historical time period to obtain the deviation capacity Wh_evmn_diff.

[0123] It should be noted that the above scheme one is to perform energy storage charging system-level response for the total charging demand power ∑Pow_evmn_need of multiple charging terminals, and obtain the first total deviation power ∑Pow_diff1 and deviation capacity Wh_evmn_diff from the demand response of the preset charging equipment, so as to realize the expansion control of the energy storage device DES according to the first total deviation power ∑Pow_diff1 and deviation capacity Wh_evmn_diff; the above scheme two is to achieve fine control for the charging demand power Pow_evmn_need of a single charging terminal, and obtain the second total deviation power ∑Pow_diff2 and deviation capacity Wh_evmn_diff from the demand response of the preset charging equipment, so as to realize the expansion control of the energy storage device DES according to the second total deviation power ∑Pow_diff2 and deviation capacity Wh_evmn_diff.

[0124] S1004, Calculate the energy storage of the energy storage device.

[0125] Specifically, if the first total deviation power ∑Pow_diff of the energy storage charging system is greater than the first preset deviation power threshold Pow_evmn_limit1, then the preset flag bit Flag_Diff_cal of the energy storage charging system is set to 0. Based on the preset maximum operating power Pow_pcc_set_max of the PCC and the real-time operating power Pow_pcc_run of the PCC, the rechargeable power Pow_des_chg_allow is obtained through the above formula (3). Then, the rechargeable power Pow_des_chg_allow is integrated over multiple time periods Time_control_setp within a preset historical time period, that is, the rechargeable capacity Wh_des_chg_allow within multiple time periods Time_control_setp is obtained according to the above formula (6). Then, the rechargeable power Pow_des_chg_allow and rechargeable capacity Wh_des_chg_allow of the energy storage device DES are obtained, and energy is stored according to the rechargeable power Pow_des_chg_allow and rechargeable capacity Wh_des_chg_allow. This is used to execute a peak-valley arbitrage strategy to obtain electricity price difference revenue and realize the economic efficiency of the energy storage charging system.

[0126] S1005. Calculate the reserved capacity and discharge cutoff state of charge parameters of the energy storage charging system.

[0127] Specifically, the rechargeable capacity Wh_des_chg_allow and the deviation capacity Wh_evmn_diff are used to determine the total deviation capacity WhX_diff for multiple time periods Time_control_setp using the above formula (8), and the maximum deviation capacity is determined from the total deviation capacity WhX_diff for multiple time periods as the reserved capacity WhX_diff_max.

[0128] Then, based on the obtained reserved capacity WhX_diff_max and the rated capacity WhX_diff_des_rate of the energy storage device DES, the discharge cutoff state-of-charge parameter SOC_des_deschg_stop of the energy storage device DES is obtained according to the above formula (9). After obtaining the discharge cutoff state-of-charge parameter SOC_des_deschg_stop of the energy storage device DES, the reserve power E_reserve of the energy storage device DES is obtained through the above formula (10) to meet the needs of emergency power supply or grid frequency regulation.

[0129] The operation control method for the energy storage charging system provided in this application determines the charging time period of the energy storage charging system. By reasonably determining the charging time period, it utilizes off-peak electricity prices to reduce charging costs. It determines whether the first total deviation power of the energy storage charging system is less than or equal to a first preset deviation power threshold. If so, it calculates the demand response of the preset charging equipment; if not, it calculates the energy storage of the energy storage device. Finally, it calculates the reserved capacity and discharge cutoff state-of-charge parameters of the energy storage charging system. Therefore, this application divides the energy storage capacity into working capacity and reserved capacity. The working capacity (schedulable capacity) is used to execute peak-valley arbitrage strategies to obtain electricity price difference revenue, achieving the economic efficiency of the energy storage charging system. The reserved capacity is used to adapt to the dynamic adjustment of distribution capacity, transforming the implicit power shortage problem into calculable reserved capacity, making the expansion target clear and quantifiable. This allows for the dual-objective optimization of arbitrage revenue and expansion guarantee through capacity segmentation. Simultaneously, by combining the reserved capacity to quantify future demand and the discharge cutoff state-of-charge parameters to ensure safety boundaries, a complete closed loop from demand forecasting and capacity design to safety control is formed, improving the safety and stability of the energy storage charging system.

[0130] Based on the same inventive concept, this application also provides an operation control device for an energy storage charging system. Since the principle of the device in this application is similar to the operation control method of the energy storage charging system described above in this application, the implementation of the device can refer to the implementation of the method, and the repeated parts will not be described again.

[0131] Figure 17 This is a schematic diagram of the operation control device for an energy storage and charging system provided in an embodiment of this application. Figure 17 As shown, the operation control device 1100 of the energy storage and charging system may include: The acquisition module 1101 is used to acquire historical charging power data of each charging terminal in the energy storage charging system within a preset historical time period. The determination module 1102 is used to determine the reserved capacity of the energy storage device in the energy storage charging system based on the historical charging operation power data of each charging terminal and the corresponding historical charging demand power data. The reserved capacity is used for capacity expansion control of the energy storage device.

[0132] In one optional implementation, the determining module 1102 is specifically used to: determine the first total deviation power of the energy storage charging system based on the historical charging operation power data of each charging terminal and the corresponding historical charging demand power data; determine the expansion demand power of the energy storage device based on the first total deviation power; and determine the reserved capacity based on the expansion demand power.

[0133] In one optional implementation, the determining module 1102 is specifically used to: determine the historical total charging power and the historical total charging demand power of the energy storage charging system based on the historical charging power data of each charging terminal and the corresponding historical charging demand power data; if the historical total charging power is less than the historical total charging demand power, then calculate the first total deviation power based on the power difference between the preset maximum operating power in the energy storage charging system and the historical total charging demand power.

[0134] In one optional implementation, the determining module 1102 is specifically used to: determine the first total deviation power as the expansion demand power; or, if the first total deviation power is less than or equal to the first preset deviation power threshold, calculate the first historical charging deviation power of each charging terminal based on the historical charging operation power data of each charging terminal and the corresponding historical charging demand power data; and determine the expansion demand power based on the first historical charging deviation power of each charging terminal.

[0135] In one optional implementation, the determining module 1102 is specifically used for: determining the second historical charging deviation power of each charging terminal based on the historical charging operation power data of each charging terminal and the preset maximum operating power of the charging terminal; determining whether the first historical charging deviation power and the second historical charging deviation power of each charging terminal meet the corresponding deviation power conditions; determining the target charging terminal from each charging terminal whose first historical charging deviation power and the second historical charging deviation power both meet the corresponding deviation power conditions; and calculating the second total deviation power of the energy storage charging system as the expansion demand power based on the sum of the first historical charging deviation power of each target charging terminal.

[0136] In one optional implementation, the determining module 1102 is specifically configured to: determine whether the first historical charging deviation power of each charging terminal is greater than or equal to a second preset deviation power threshold; if the first historical charging deviation power of the first charging terminal is greater than or equal to the second preset deviation power threshold, then determine that the first historical charging deviation power of the first charging terminal meets the corresponding deviation power condition; determine whether the second historical charging deviation power of each charging terminal is greater than or equal to a third preset deviation power threshold; if the second historical charging deviation power of the second charging terminal is greater than or equal to the third preset deviation power threshold, then determine that the second historical charging deviation power of the second charging terminal meets the corresponding deviation power condition.

[0137] In one optional implementation, the determining module 1102 is specifically used to: perform time integration on the expansion demand power of multiple time periods within a preset historical time period to obtain the total deviation capacity of the multiple time periods; and determine the maximum deviation capacity from the total deviation capacity of the multiple time periods as the reserved capacity.

[0138] In an alternative embodiment, the operation control device 1100 is further configured to: determine the discharge cutoff state of charge parameters of the energy storage device based on the reserved capacity and the rated capacity of the energy storage device.

[0139] It should be noted that for details not disclosed in the operation control device of the energy storage charging system in the embodiments of this application, please refer to the details disclosed in the operation control method of the energy storage charging system in the embodiments of this application, which will not be repeated here.

[0140] These modules can be one or more integrated circuits configured to implement the above methods, such as one or more Application Specific Integrated Circuits (ASICs), one or more microprocessors, or one or more Field Programmable Gate Arrays (FPGAs). Alternatively, when a module is implemented using processing element scheduler code, the processing element can be a general-purpose processor, such as a Central Processing Unit (CPU) or other processor capable of calling program code. Furthermore, these modules can be integrated together as a system-on-a-chip (SOC).

[0141] Optionally, embodiments of this application also provide a readable storage medium storing a computer program. When the computer program is run by a processor, the processor executes the steps of the operation control method for the energy storage and charging system of the mobile storage medium in the above embodiments. The specific implementation and technical effects are similar and will not be repeated here.

[0142] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The integrated unit described above can be implemented in hardware or in the form of hardware plus software functional units.

[0143] The integrated units implemented as software functional units described above can be stored in a computer-readable storage medium. These software functional units, stored in a storage medium, include several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) or processor to execute some steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks. The above descriptions are merely embodiments of this application and are not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A method for controlling the operation of an energy storage and charging system, characterized in that, include: Obtain historical charging power data of each charging terminal in the energy storage charging system within a preset historical time period; Based on the historical charging power data of each charging terminal and the corresponding historical charging demand power data, the reserved capacity of the energy storage device in the energy storage charging system is determined. The reserved capacity is used for capacity expansion control of the energy storage device. The step of determining the reserved capacity of the energy storage device in the energy storage charging system based on the historical charging power data of each charging terminal and the corresponding historical charging demand power data includes: Based on the historical charging operation power data of each charging terminal and the corresponding historical charging demand power data, the first total deviation power of the energy storage charging system is determined. The expansion power requirement of the energy storage device is determined based on the first total deviation power. The reserved capacity is determined based on the power required for expansion; The step of determining the first total deviation power of the energy storage charging system based on the historical charging operation power data of each charging terminal and the corresponding historical charging demand power data includes: Based on the historical charging power data of each charging terminal and the corresponding historical charging demand power data, the total historical charging power and the total historical charging demand power of the energy storage charging system are determined. If the total historical charging power is less than the total historical charging demand power, then the first total deviation power is calculated based on the power difference between the preset maximum operating power in the energy storage charging system and the total historical charging demand power. Determining the expansion power requirement of the energy storage device based on the first total deviation power includes: The first total deviation power is determined as the expansion demand power; Alternatively, if the first total deviation power is less than or equal to the first preset deviation power threshold, then the first historical charging deviation power of each charging terminal is calculated based on the historical charging operation power data of each charging terminal and the corresponding historical charging demand power data; and the expansion demand power is determined based on the first historical charging deviation power of each charging terminal. The step of determining the expansion power requirement based on the first historical charging deviation power of each charging terminal includes: Based on the historical charging power data of each charging terminal and the preset maximum operating power of the charging terminal, the second historical charging deviation power of each charging terminal is determined. Determine whether the first historical charging deviation power and the second historical charging deviation power of each charging terminal meet the corresponding deviation power conditions. From the charging terminals, a target charging terminal is determined in which both the first historical charging deviation power and the second historical charging deviation power satisfy the corresponding deviation power condition. The second total deviation power of the energy storage charging system is calculated as the expansion demand power based on the sum of the first historical charging deviation power of each target charging terminal.

2. The operation control method for the energy storage and charging system according to claim 1, characterized in that, Determining whether the first historical charging deviation power and the second historical charging deviation power of each charging terminal meet the corresponding deviation power conditions includes: Determine whether the first historical charging deviation power of each charging terminal is greater than or equal to the second preset deviation power threshold; If the first historical charging deviation power of the first charging terminal among the charging terminals is greater than or equal to the second preset deviation power threshold, then it is determined that the first historical charging deviation power of the first charging terminal satisfies the corresponding deviation power condition. Determine whether the second historical charging deviation power of each charging terminal is greater than or equal to the third preset deviation power threshold; If the second historical charging deviation power of the second charging terminal among the charging terminals is greater than or equal to the third preset deviation power threshold, then it is determined that the second historical charging deviation power of the second charging terminal meets the corresponding deviation power condition.

3. The operation control method for the energy storage and charging system according to claim 1, characterized in that, Determining the reserved capacity based on the expansion demand power includes: The expansion demand power for multiple time periods within the preset historical time period is integrated over time to obtain the total deviation capacity for the multiple time periods. The maximum deviation capacity is determined from the total deviation capacity of the multiple time periods as the reserved capacity.

4. The operation control method for the energy storage and charging system according to claim 1, characterized in that, The method further includes: Based on the reserved capacity and the rated capacity of the energy storage device, the discharge cutoff state of charge parameters of the energy storage device are determined.

5. A control device, characterized in that, include: A processor and a memory, the memory storing machine-executable instructions executable by the processor, the processor executing the machine-executable instructions to implement the method of any one of claims 1-4.

6. An energy storage and charging system, characterized in that, include: Control device, energy storage device, at least one charging host, and charging terminals connected to each charging host; Both the energy storage device and the charging host are connected to a preset input power line; The control device is communicatively connected to the energy storage device and each charging terminal, and the control device is used to execute the method described in any one of claims 1-4; or, the energy storage device is communicatively connected to each charging terminal, and the energy storage device is also used to execute the method described in any one of claims 1-4.

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