Operation control method and control device of energy storage charging system and energy storage charging system

Abstract

The invention provides an operation control method and device of an energy storage charging system and the energy storage charging system, and relates to the technical field of charging control. The method includes; acquiring historical charging operation power data of each charging terminal in the energy storage charging system in a preset historical time period; according to the historical charging operation power data of each charging terminal and the corresponding historical charging demand power data, the reserved capacity of an energy storage device in the energy storage charging system is determined, and the reserved capacity is used for carrying out capacity expansion control on the energy storage device. Therefore, high-efficiency reuse and flexible allocation of the energy storage device can be realized without additionally adding a new energy storage device, and the dynamic change requirement of the charging load of the electric vehicle is met.

Description

Technical Field

[0001] The present application relates to the field of charging control technology, and in particular to an operation control method, a control device, and an energy storage charging system. Background Art

[0002] With the booming new energy vehicle industry, the market share of supercharged electric vehicles continues to rise, driving a growing demand for high-power charging. Under the existing distribution network architecture, the grid's instantaneous power capacity is capped. When multiple electric vehicles are simultaneously charging at high power, the distribution network often struggles to meet the instantaneous high power demand, limiting the power available to charging equipment and severely impacting the construction and efficiency of electric vehicle charging facilities. To address the issue of limited charging equipment capacity due to insufficient power distribution network capacity, energy storage and charging technologies are combined to solve this problem. For example, existing technologies typically configure the power and capacity of energy storage devices based on load conditions.

[0003] However, in existing technologies, the entire storage capacity of energy storage devices is used for peak-valley arbitrage. When the actual charging load exceeds the grid's supply capacity and requires expansion, additional energy storage devices must be added to meet the demand. This approach easily leads to over-allocation of storage capacity and power, resulting in low utilization efficiency, inability to achieve efficient reuse and flexible deployment of energy storage devices, and inability to effectively adapt to the dynamic changes in EV charging loads. Summary of the Invention

[0004] The purpose of the embodiments of the present application is to provide an operation control method, a control device, and an energy storage charging system for an energy storage charging system, which are used to divide the energy storage capacity into reserved capacity and working capacity. The working capacity is used to implement a peak-valley arbitrage strategy to obtain electricity price difference benefits; the reserved capacity is used to adapt to the dynamic adjustment of the distribution capacity. That is, the present application does not require the addition of new energy storage devices to achieve efficient reuse and flexible deployment of energy storage devices, adapting to the dynamic changes in the charging load of electric vehicles.

[0005] In order to achieve the above objectives, the technical solutions adopted in the embodiments of the present application are as follows: In a first aspect, an embodiment of the present application provides an operation control method for an energy storage charging system, comprising: obtaining historical charging operation power data of each charging terminal in the energy storage charging system within a preset historical time period; determining a reserved capacity of an energy storage device in the energy storage charging system based on the historical charging operation power data of each charging terminal and corresponding historical charging demand power data, wherein the reserved capacity is used to control the expansion of the energy storage device.

[0006] Optionally, determining 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 includes: determining a 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; 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.

[0007] Optionally, 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: determining the historical charging operation total power and the historical charging demand total 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; if the historical charging operation total power is less than the historical charging demand total power, 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 charging demand total power.

[0008] Optionally, determining the expansion requirement power of the energy storage device based on the first total deviation power includes: determining the first total deviation power as the expansion requirement power; 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 requirement power data; and determining the expansion requirement power based on the first historical charging deviation power of each charging terminal.

[0009] Optionally, determining the capacity expansion requirement power 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 operating 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 deviation power of each charging terminal meet corresponding deviation power conditions; determining a target charging terminal from each charging terminal whose first historical charging deviation power and second historical deviation power both meet the corresponding deviation power conditions; and calculating the second total deviation power of the energy storage charging system as the capacity expansion requirement power based on the sum of the first historical charging deviation powers of the target charging terminals.

[0010] Optionally, the determining whether the first historical charging deviation power and the second historical deviation power of each charging terminal satisfy the corresponding deviation power condition comprises: 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 a first charging terminal in the charging terminals is greater than or equal to the second preset deviation power threshold, it is determined that the first historical charging deviation power of the first charging terminal satisfies 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 a second charging terminal in the charging terminals is greater than or equal to the third preset deviation power threshold, it is determined that the second historical charging deviation power of the second charging terminal satisfies the corresponding deviation power condition.

[0011] Optionally, the determining the reserved capacity according to the expansion demand power comprises: time-integrating the expansion demand power of a plurality of time periods in the preset historical time period respectively to obtain total deviation capacities of the plurality of time periods; and determining a maximum deviation capacity from the total deviation capacities of the plurality of time periods as the reserved capacity.

[0012] Optionally, the method further comprises: determining a discharge cut-off state of charge parameter of the energy storage device according to the reserved capacity and a rated capacity of the energy storage device.

[0013] In a second aspect, an embodiment of the present application provides a control device, comprising: a processor and a memory, the memory storing machine executable instructions capable of being executed by the processor, and the processor being capable of executing the machine executable instructions to implement the method of any of the first aspect.

[0014] In a third aspect, an embodiment of the present application provides an energy storage charging system, comprising: a control device, an energy storage device, at least one charging host, and charging terminals connected with the charging hosts; wherein the energy storage device and the charging hosts are connected with a preset input power line; the control device, the energy storage device, and the charging terminals are in communication connection, and the control device is configured to execute the method of any of the first aspect; or the energy storage device and the charging terminals are in communication connection, and the energy storage device is further configured to execute the method of any of the first aspect.

[0015] Compared with the prior art, the energy storage charging system operation control method, the control device, and the energy storage charging system provided by the present application have the following technical effects: The present application provides an operation control method, a control device, and an energy storage charging system for an energy storage charging system, wherein the operation control method of the energy storage charging system includes: obtaining the historical charging operation power data of each charging terminal in the energy storage charging system within a preset historical time period; then determining 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, so as to realize the expansion control of the energy storage device, prevent the occurrence of the preset power grid backflow accident caused by excessive reservation of the energy storage device, and then adapt the dynamic adjustment of the distribution capacity to improve the utilization efficiency of the energy storage charging system. Therefore, the present application can divide the energy storage capacity into working capacity and reserved capacity, wherein the working capacity (dispatchable capacity) is used to execute the peak-valley arbitrage strategy to obtain the electricity price difference profit and realize the economy of the energy storage charging system; the reserved capacity is used to adapt the dynamic adjustment of the distribution capacity to convert the implicit power supply shortage problem into a calculable reserved capacity, so that the expansion target is clear and quantifiable, and then achieve the dual-objective optimization of arbitrage profit and expansion guarantee through capacity segmentation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 A schematic diagram of the structure of an energy storage and charging system provided in an embodiment of the present application; Figure 2 A schematic structural diagram of a control device provided in an embodiment of the present application; Figure 3 A schematic diagram of a method for controlling the operation of an energy storage charging system provided in an embodiment of the present application Figure 1 ; Figure 4 A schematic diagram of a charge and discharge operation control strategy for an energy storage charging system based on peak-valley electricity price difference provided in an embodiment of the present application; Figure 5 A schematic diagram of a method for controlling the operation of an energy storage charging system provided in an embodiment of the present application Figure 2 ; Figure 6 A schematic diagram of a method for controlling the operation of an energy storage charging system provided in an embodiment of the present application Figure 3 ; Figure 7 A schematic diagram of a total charging power deviation and energy demand provided in an embodiment of the present application Figure 1 ; Figure 8 A schematic diagram of a total charging power deviation and energy demand provided in an embodiment of the present application Figure 2 ; Figure 9 A schematic diagram of a method for controlling the operation of an energy storage charging system provided in an embodiment of the present application Figure 4 ; Figure 10 A schematic diagram of charging capacity and power deviation of an energy storage charging system provided in an embodiment of the present application; Figure 11 A schematic diagram of a method for controlling the operation of an energy storage charging system provided in an embodiment of the present application Figure 5 ; Figure 12 A schematic diagram of a method for controlling the operation of an energy storage charging system provided in an embodiment of the present application Figure 6 ; Figure 13 A schematic diagram of the discharge capacity and power deviation of an energy storage charging system provided in an embodiment of the present application; Figure 14 A flow chart of an operation control method of an energy storage charging system provided in an embodiment of the present application seven ; Figure 15 A schematic diagram of the reserved capacity and discharge cut-off state of charge parameters of an energy storage charging system provided in an embodiment of the present application; Figure 16 A schematic diagram of a method for controlling the operation of an energy storage charging system provided in an embodiment of the present application Figure 8 ; Figure 17 A schematic structural diagram of an operation control device for an energy storage and charging system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0019] Figure 1 This is a schematic diagram of the structure of an energy storage and charging system provided in an embodiment of the present 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 permitted power distribution capacity of the preset power grid, energy storage devices can be deployed to expand the capacity.

[0020] The energy storage device DES and the charging host CHGm are connected in parallel to the preset input power line to realize overall management of the preset grid input power of the energy storage charging system 100 through dynamic regulation of the control device 110 or the energy storage device DES. For example, when the preset grid load is low, the energy storage device DES is controlled to absorb power from the preset grid to avoid energy waste; when the preset grid load is high or the electricity price is high, the energy of the energy storage device DES is preferentially used to supply power to the charging terminal EVm_n to reduce the instantaneous power dependence on the preset grid. This process can smooth the power fluctuation of the grid, reduce the expansion pressure of the grid, improve the energy utilization efficiency, and reduce the overall operating cost.

[0021] The control device 110, the energy storage device DES, each charging host CHGm, and each charging terminal EVm_n are in communication connection, and the control device is used to execute the operation control method of the energy storage charging system; or the energy storage device DES and each charging terminal EVm_n are in communication connection, and the energy storage device DES is further used to execute the operation control method of the energy storage charging system.

[0022] In a possible implementation, when the control device 110, the energy storage device DES, each charging host CHGm, and each charging terminal EVm_n are in global communication connection, the data collected by 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, and the control device 110 or the energy storage device DES is used to support dynamic expansion decision and peak-valley arbitrage scheduling, that is, to execute the operation control method of the energy storage charging system.

[0023] The charging host CHGm is a centralized power conversion and distribution device in the energy storage charging system 100, which converts the power provided by the preset grid or the energy storage device DES into controllable direct current and distributes it to multiple charging terminals EVm_n. The charging terminal EVm_n is an execution unit directly connected to the preset charging device (such as an electric vehicle), which is controlled by the power distribution of the charging host CHGm to realize the transmission of power to the battery of the preset charging device.

[0024] It should be noted that the control device 110 and the energy storage device DES can flexibly switch based on scenario requirements. For example, in complex scenarios (e.g., multiple terminals and high power demands), 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 (e.g., a small number of terminals and low power demands), 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 enables the energy storage charging system to adapt to charging needs of different scales (e.g., small charging piles, large charging stations) and different types (e.g., electric vehicles). Furthermore, to clarify the implementation of the technical solution, the following examples use the control device 110 as the execution entity to illustrate the operation and control methods of the energy storage charging system.

[0025] Continue to refer Figure 1 The control device 110 is also in communication with the electricity 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 electrical access point between the preset power grid and the energy storage charging system. When it is detected that the real-time operating power Pow_pcc_run of the PCC is 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; at the same time, the control device 110 will send a load reduction instruction 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.

[0026] 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 supply. When the preset power grid fails or the preset input power line is interrupted, the energy storage device DES can directly power each charging terminal EVm_n to avoid interruption of charging service.

[0027] The energy storage charging system provided by the application can be composed of a control device, an energy storage device, at least one charging host, and a charging terminal connected with each charging host. The energy storage device and the charging host are connected with a preset input power line. The control device, the energy storage device, and each charging terminal are in communication connection. The control device is used to execute the operation control method of the energy storage charging system. Alternatively, the energy storage device and each charging terminal are in communication connection. The energy storage device is also used to execute the operation control method of the energy storage charging system to compensate for the power gap of the charging host in real time, share the load of the power grid, and smooth the power fluctuation. Thus, the control device or the energy storage device in the application can obtain real-time charging demand by communication with the charging terminal, dynamically adjust the output strategy, avoid the impact of concentrated high-power charging on the preset power grid, and improve the compatibility of the energy storage charging system and the preset power grid.

[0028] Optionally, the application also provides a control device 110, Figure 2 A structural schematic diagram of a control device provided by an embodiment of the application is shown in the figure. Figure 2 As shown in the figure, the control device 110 can include a processor 111 and a memory 112.

[0029] 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 above-mentioned machine readable instructions are executed, and the processor 111 and the memory 112 are in communication through a bus. The processor 111 can execute the machine executable instructions to realize the operation control method of the energy storage charging system.

[0030] The memory 112, the processor 111, and the bus are directly or indirectly electrically connected with each other to realize the transmission or interaction of data. For example, these elements can be electrically connected with each other through one or more communication buses or signal lines. The memory 112 can be, but is not limited to, a random access memory (RAM), a read only memory (ROM), a programmable read only memory (PROM), an erasable programmable read only memory (EPROM), an electrically erasable programmable read only memory (EEPROM), etc.

[0031] The operation control method of the energy storage charging system provided by the embodiment of the application can be executed by the processor in the control device 110, Figure 3 A flowchart of the operation control method of the energy storage charging system provided by an embodiment of the application is shown in the figure. Figure 1 .like Figure 3 As shown, the method may include: S201: Obtain historical charging operation power data of each charging terminal in the energy storage charging system within a preset historical time period.

[0032] The preset historical time period can be selected according to actual conditions. For example, the preset historical time period can be selected as the peak time period, peak time period, flat time period, flat time period, or flat time period, etc. of the day.

[0033] For example, Figure 4 This is a schematic diagram of a charge and discharge operation control strategy for an energy storage charging system based on peak-valley electricity price difference provided in an embodiment of the present application. Figure 4 As shown in the figure, within the preset historical time period, the energy storage device DES implements the following charging and discharging strategies: in the valley and flat time periods, ① charging operations are prioritized to store energy using low-priced electricity; in the peak time period, ② it switches to discharge mode to release electricity to participate in peak-valley arbitrage; special working condition response mechanism: If the total charging load power (i.e., the total charging demand power data) is detected to approach 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 discharge mode (directly compensating for the power gap and realizing dynamic capacity expansion).

[0034] In one possible implementation, reference Figure 1 Each charging terminal EVm_n is communicatively connected to the control device to transmit data collected by each charging terminal EVm_n to the control device, so that the control device obtains historical charging operation power data Pow_evmn_run (i.e., actual output power) and historical charging demand power data Pow_evmn_need (i.e., preset charging device request power or 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.

[0035] It should be noted that the historical charging operation power data Pow_evmn_run is used to represent the charging operation power of the mnth 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, this refers to the first charging terminal EV1_1 of the first charging host CHG1. Similarly, the historical charging demand power data Pow_evmn_need is used to represent the charging demand power of the mnth preset charging device (such as an electric vehicle).

[0036] It should also be noted that, generally, the actual charging operation power data Pow_evmn_run of the charging terminal EVm_n never exceeds its required charging power data Pow_evmn_need, that is, 0 ≤ Pow_evmn_run ≤ Pow_evmn_need. When the charging operation power data Pow_evmn_run of the charging terminal EVm_n is equal to its required charging power data Pow_evmn_need, it indicates that the charging load is normal (i.e., not overloaded). 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, and can meet the current charging demand.

[0037] When the charging operating power data (Pow_evmn_run) of a charging terminal (EVm_n) is less than its required charging power data (Pow_evmn_need), it indicates an overload. The PCC point's real-time operating power (Pow_pcc_run) is likely approaching or exceeding the preset maximum operating power (Pow_pcc_set_max). To avoid triggering grid protection mechanisms or causing failure of the energy storage charging system, the energy storage charging system initiates power limiting. This involves forcing some charging terminals (EVm_n) to operate at reduced ratings to ensure that the PCC point's real-time operating power (Pow_pcc_run) remains within the preset maximum operating power (Pow_pcc_set_max). In this case, the charging operating power data (Pow_evmn_run) of the charging terminal (EVm_n) is forced to fall below its required charging power data (Pow_pcc_set_max) due to the energy storage charging system's control. This forces the charging terminal (EVm_n) to operate at a power-limited state.

[0038] S202: Determine the reserved capacity of the energy storage device in the energy storage charging system according to the historical charging operation power data of each charging terminal and the corresponding historical charging demand power data.

[0039] The reserved capacity WhX_diff_max is used to control the expansion of the energy storage device DES. That is, the reserved capacity WhX_diff_max is the capacity that does not participate in the discharge work. It is also the minimum energy reserve required by the energy storage device DES to ensure that in historical extreme scenarios, the energy storage device DES can fill the gap through continuous discharge and avoid power limiting.

[0040] In one possible implementation, due to the hardware constraints and control strategies of the energy storage charging system, the historical charging operation power data Pow_evmn_run always does not exceed the historical charging demand power data Pow_evmn_need, that is, 0 ≤ Pow_evmn_run ≤ Pow_evmn_need. 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, the capacity of the energy storage device DES can be divided into reserved capacity WhX_diff_max and working 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 working capacity, or dispatchable capacity, is the remainder of the total capacity of the energy storage device DES minus the reserved capacity WhX_diff_max, and is used to implement peak-valley arbitrage strategies to obtain profits from electricity price differences.

[0041] The operation control method of the energy storage charging system provided in the present application obtains the historical charging operation power data of each charging terminal in the energy storage charging system within a preset historical time period; then, based on the historical charging operation power data of each charging terminal and the corresponding historical charging demand power data, determines the reserved capacity of the energy storage device in the energy storage charging system to achieve expansion control of the energy storage device, prevent the occurrence of preset power grid backflow accidents caused by excessive reservation of the energy storage device, and then adapt the dynamic adjustment of the distribution capacity to improve the utilization efficiency of the energy storage charging system. Therefore, the present application can divide the energy storage capacity into working capacity and reserved capacity, wherein the working capacity (dispatchable capacity) is used to execute the peak-valley arbitrage strategy to obtain electricity price difference benefits and realize the economy of the energy storage charging system; the reserved capacity is used to adapt the dynamic adjustment of the distribution capacity to convert the implicit power supply shortage problem into a calculable reserved capacity, so that the expansion target is clear and quantifiable, and then achieve the dual-objective optimization of arbitrage benefits and expansion guarantee through capacity segmentation.

[0042] Figure 5 A schematic diagram of a method for controlling the operation of an energy storage charging system provided in an embodiment of the present application Figure 2 .like Figure 5 As shown, the above method may include determining 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, which may include: S301: Determine a first total deviation power of the energy storage charging system based on historical charging operation power data of each charging terminal and corresponding historical charging demand power data.

[0043] In one possible implementation, 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, the first total deviation power ∑Pow_diff of the energy storage charging system is determined 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.

[0044] S302: Determine the required expansion power of the energy storage device according to the first total deviation power.

[0045] In a possible implementation, the first total deviation power ∑Pow_diff is determined as the expansion required power of the energy storage device DES. 0, it means that there is no power gap in the historical charging power data, that is, the first total deviation power ∑Pow_diff is equal to 0, and no capacity expansion is required; if the first total deviation power ∑Pow_diff 0, it means that the gap needs to be filled by discharging the energy storage device DES or by pre-setting the grid capacity expansion. The energy storage device DES capacity expansion is preferred because it is cheaper and faster to implement.

[0046] S303: Determine the reserved capacity according to the required power for expansion.

[0047] In one possible implementation, the expansion demand power is converted into capacity demand, and the duration of the gap needs to be considered to determine the reserved capacity WhX_diff_max.

[0048] 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 operation 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 to energy gap through the technical path from 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, achieving dynamic capacity expansion.

[0049] Figure 6 A schematic diagram of a method for controlling the operation of an energy storage charging system provided in an embodiment of the present application Figure 3 .like Figure 6 As shown, in the above method, 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 may include: S401. Determine the historical total charging operation power and the historical total charging demand power of the energy storage charging system based on the historical charging operation power data and the corresponding historical charging demand power data of each charging terminal.

[0050] 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.

[0051] S402: If the historical charging operation total power is less than the historical charging demand total power, calculate a first total deviation power according to the power difference between the preset maximum operating power in the energy storage charging system and the historical charging demand total power.

[0052] In one possible implementation, the historical total charging operation power ∑Pow_evmn_run is less than the historical total charging demand power ∑Pow_evmn_need, that is, the sum of the charging operation power of all preset charging devices (such as electric vehicles) is less than the sum of the charging demand power of all preset charging devices (such as electric vehicles), indicating that within the preset historical time period, there is a power gap in the historical total power data of the energy storage charging system, 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 in an overload scenario. Therefore, it is necessary to limit the total charging operation power to within the preset maximum operating power Pow_pcc_set_max. Then, based on the preset maximum operating power Pow_pcc_set_max in the energy storage charging system and the historical total charging demand power ∑Pow_evmn_need, the first total deviation power ∑Pow_diff1 is calculated according to the following formula (1).

[0053] ∑Pow_diff1=Pow_pcc_set_max-∑Pow_evmn_need formula (1) The above formula (1) is used to express the portion of the total charging demand power that exceeds the preset grid allowable capacity, that is, the preset remaining available power of the distribution network.

[0054] For example, Figure 7 As shown, Figure 7 A schematic diagram of a total charging power deviation and energy demand provided in an embodiment of the present application Figure 1 . Combined with the above Figure 4The charging and discharging 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 periods. In the preset historical time period t0~t2①, the historical charging operation total power ∑Pow_evmn_run1 is less than the historical charging demand total power ∑Pow_evmn_need1, then according to the above formula (1), arrive The first total deviation power ΣPow_diff1, that is, the first total deviation power ΣPow_diff1=Pow_pcc_set_max-ΣPow_evmn_need1. The first total deviation power ΣPow_diff1 is used to indicate that the energy storage device DES needs to discharge to achieve capacity expansion.

[0055] Similarly, continue to refer to Figure 7 In the preset historical time period t2~t3①, the historical charging operation total power ∑Pow_evmn_run2 is less than the historical charging demand total 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,因此,在t2~t3②这个时间段内,由于历史充电需求总功率∑Pow_evmn_need2未超过预设最大运行功率Pow_pcc_set_max,则充电功率得到满足,此时,根据上述公式(1)得 arrive The first total deviation power ∑Pow_diff1, that is, the first total deviation power ∑Pow_diff1=Pow_pcc_set_max-∑Pow_evmn_need2, is used to indicate that the energy storage device DES can be charged, so as to improve the utilization rate of the energy storage charging system.

[0056] For example, this application also provides a schematic diagram of charging power deviation and energy demand. Figure 8 As shown, Figure 8 A schematic diagram of a total charging power deviation and energy demand provided in an embodiment of the present application Figure 2 . Combined with the above Figure 4The charge 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 periods. During the preset historical time period t1 to t2①, if the historical total charging operation power ∑Pow_evmn_run1 is less than the historical total 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.

[0057] During the preset historical time period t0~t1②, the historical charging operation total power ∑Pow_evmn_run2 is less than the historical charging demand total 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,因此,在t2~t3②这个时间段内,由于历史充电需求总功率∑Pow_evmn_need2未超过预设最大运行功率Pow_pcc_set_max,则充电功率得到满足,此时,根据上述公式(1)得 arrive The first total deviation power ∑Pow_diff2, that is, the first total deviation power ∑Pow_diff1=Pow_pcc_set_max-∑Pow_evmn_need2, is used to indicate that the energy storage device DES can be charged, so as to improve the utilization rate of the energy storage charging system.

[0058] In summary, Figure 7 and Figure 8 The difference is that Figure 7 No charging during the preset historical time period t0~t1, waiting for capacity expansion; Figure 8 Charging is performed first within the preset historical time period t0~t1 to optimize the utilization of the reserved capacity, thereby reducing the configuration requirements of the total energy storage capacity.

[0059] The operation control method of the energy storage charging system provided in the present application determines the historical charging operation total power and the historical charging demand total 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; if the historical charging operation total power is less than the historical charging demand total power, the first total deviation power is calculated based on the preset maximum operating power in the energy storage charging system and the power difference between the historical charging demand total power. Therefore, the present application can intuitively evaluate the historical overload degree based on the first total deviation power, provide a core basis for the capacity design of the energy storage device, and avoid the problem of over-reservation or under-reservation. At the same time, the first total deviation power can also directly reflect the power gap that the energy storage needs to supplement. The energy storage charging system can give priority to calling on energy storage electricity to fill the gap instead of relying on the preset grid capacity increase, avoiding safety hazards caused by overload, and then through the historical first total deviation power distribution analysis, the energy storage charging system can optimize the power limit priority (such as giving priority to limiting charging terminals with low charging efficiency requirements) to minimize the impact on user experience.

[0060] Optionally, in the above method, determining the required expansion power of the energy storage device according to the first total deviation power includes: A first total deviation power is determined as the required expansion power.

[0061] In one possible implementation, a first total deviation power ∑Pow_diff is directly determined as the capacity expansion requirement of the energy storage device DES. This 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. This reflects the unmet rigid power demand in historical scenarios due to grid capacity limitations (such as PCC power constraints). Using this as the capacity expansion requirement can accurately meet capacity expansion requirements, ensuring that the energy storage charging system no longer triggers power limits under the same or higher load, thereby improving the reliability and operational safety of the energy storage charging system.

[0062] or, Figure 9 A schematic diagram of a method for controlling the operation of an energy storage charging system provided in an embodiment of the present application Figure 4 .like Figure 9 As shown, in the above method, determining the expansion required power of the energy storage device according to the first total deviation power includes: S501: If the first total deviation power is less than or equal to a first preset deviation power threshold, calculate a first historical charging deviation power of each charging terminal according to historical charging operation power data and corresponding historical charging demand power data of each charging terminal.

[0063] The first preset deviation power threshold Pow_evmn_limit1 may be selected according to actual conditions.

[0064] 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, that is, ∑Pow_diff1(Pow_pcc_set_max-∑Pow_evmn_need)≤Pow_evmn_limit1, it means that the energy storage charging system is overloaded, and the preset flag Flag_Diff_cal of the energy storage charging system is controlled to be 1. 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, the first historical charging deviation power Pow_evmn_diff1 of each charging terminal EVm_n is calculated according to the following formula (2).

[0065] Pow_evmn_diff1=Pow_evmn_need-Pow_evmn_run formula (2) The first historical charging deviation power Pow_evmn_diff1 in formula (2) above is used to represent the unmet charging power demand of the energy storage charging system. This indicates overload and requires the activation of power limit control: that is, by forcing some charging terminals EVm_n to operate at a reduced capacity to ensure 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. Alternatively, 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 immediate power gap of a single charging terminal.

[0066] 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 Flag_Diff_cal of the energy storage charging system is controlled to 0, and the charging service continues to be executed.

[0067] For example, Figure 10 This is a schematic diagram of the charging capacity and power deviation of an energy storage charging system provided in an embodiment of the present application. Figure 10 As shown, the chargeable power Pow_des_chg_allow is calculated by the following formula (3) according to the preset maximum operating power Pow_pcc_set_max of the PCC and the real-time operating power Pow_pcc_run of the PCC.

[0068] Pow_des_chg_allow=Pow_pcc_set_max-Pow_pcc_run formula (3) The chargeable power Pow_des_chg_allow in the above formula (3) is used to represent the power that can be charged by the energy storage device DES.

[0069] S502: Determine the required power for capacity expansion based on the first historical charging deviation power of each charging terminal.

[0070] In a possible implementation, the first historical charging deviation power ΣPow_evmn_diff of each charging terminal EVm_n is determined as the required expansion power of the energy storage device DES according to the first historical charging deviation power ΣPow_evmn_diff of each charging terminal EVm_n.

[0071] The operation control method of the energy storage charging system provided in this application determines a first total deviation power as the capacity expansion demand power; or, if the first total deviation power is less than or equal to a first preset deviation power threshold, indicating that the overall load overload is relatively light, but there may be local overload problems where some charging terminals frequently experience power gaps, 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; based on the first historical charging deviation power of each charging terminal, the capacity expansion demand power is determined to centrally allocate the expansion capacity to the charging terminals that actually need it, avoid ineffective capacity expansion, and realize dynamic adjustment of capacity expansion demand. Therefore, this application can realize accurate capacity expansion demand and improve the reliability and operational safety of the energy storage charging system.

[0072] Figure 11 A schematic diagram of a method for controlling the operation of an energy storage charging system provided in an embodiment of the present application Figure 5 .like Figure 11 As shown, in the above method, determining the required expansion power according to the first historical charging deviation power of each charging terminal may include: S601: Determine a second historical charging deviation power for each charging terminal based on historical charging operation power data of each charging terminal and a preset maximum operation power of the charging terminal.

[0073] Among them, the preset maximum operating power of the charging terminal Pow_evmn_set_max can be selected according to actual conditions.

[0074] In one possible implementation, based on the historical charging operation power data Pow_evmn_run of each charging terminal EVm_n and the preset maximum operation power Pow_evmn_set_max of the charging terminal, the second historical charging deviation power Pow_evmn_diff2 of each charging terminal is determined according to the following formula (4).

[0075] Pow_evmn_diff2=Pow_evmn_set_max-Pow_evmn_run formula (4) The second historical charging deviation power Pow_evmn_diff2 is used to represent the unused expansion potential of a single charging terminal, providing a safe redundant space for dynamic expansion.

[0076] S602: Determine whether the first historical charging deviation power and the second historical deviation power of each charging terminal meet corresponding deviation power conditions.

[0077] In one possible implementation, a determination is made as to whether the first historical charging deviation power Pow_evmn_diff1 and the second historical deviation power Pow_evmn_diff2 of each charging terminal EVm_n meet corresponding deviation power conditions. If so, step S603 is executed; if not, power is limited for each charging terminal EVm_n or the energy storage device DES is controlled to discharge.

[0078] S603: Determine a target charging terminal from each charging terminal, where both the first historical charging deviation power and the second historical deviation power meet corresponding deviation power conditions.

[0079] S604: Calculate a second total deviation power of the energy storage charging system as the required capacity expansion power based on the sum of the first historical charging deviation powers of the target charging terminals.

[0080] In one possible implementation, the first historical charging deviation power Pow_evmn_diff1 and the second historical deviation power Pow_evmn_diff2 need to simultaneously satisfy corresponding deviation power conditions. Then, a target charging terminal is determined from each charging terminal, where both the first historical charging deviation power Pow_evmn_diff1 and the second historical deviation power Pow_evmn_diff2 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).

[0081] ∑Pow_diff2=∑Pow_evmn_diff1 formula (5) The second total deviation power ∑Pow_diff2 obtained by the above formula (5) can be used as the expansion required power of the energy storage device DES.

[0082] The operation control method of the energy storage charging system provided by the present application determines 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; then determines whether the first historical charging deviation power and the second historical deviation power of each charging terminal meet the corresponding deviation power conditions; and if the deviation power conditions are met again, determines from each charging terminal the target charging terminal whose first historical charging deviation power and second historical deviation power both meet the corresponding deviation power conditions; finally, based on the sum of the first historical charging deviation power of each target charging terminal, the second total deviation power of the energy storage charging system is calculated, and the second total deviation power can be used as the capacity expansion demand power of the energy storage device. Therefore, the present application can realize accurate capacity expansion requirements, ensure that each charging terminal in the energy storage charging system no longer triggers power limit under the same or higher load, and improve the reliability and operation safety of the energy storage charging system.

[0083] Figure 12 A schematic diagram of a method for controlling the operation of an energy storage charging system provided in an embodiment of the present application Figure 6 .like Figure 12 As shown, in the above method, 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: S701: Determine whether a first historical charging deviation power of each charging terminal is greater than or equal to a second preset deviation power threshold.

[0084] The second preset deviation power threshold P_ev_limit2 can be selected according to actual conditions. It should be noted that the second preset deviation power threshold P_ev_limit2 is smaller than the first preset deviation power threshold Pow_evmn_limit1.

[0085] S702: 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, determine that the first historical charging deviation power of the first charging terminal meets the corresponding deviation power condition.

[0086] In one possible implementation, it is determined whether the first historical charging deviation power Pow_evmn_diff1 of the first charging terminal EVm_1 among the charging terminals EVm_n is greater than or equal to a second preset deviation power threshold P_ev_limit2. If yes, i.e., the first historical charging deviation power Pow_evmn_diff1 of the first charging terminal EVm_1 among the charging terminals EVm_n is greater than or equal to the second preset deviation power threshold P_ev_limit2, 1 is output, indicating that the first charging terminal EVm_1 among the charging terminals EVm_n satisfies the corresponding deviation power condition, i.e., satisfies the high-frequency power gap. If no, i.e., the first historical charging deviation power Pow_evmn_diff1 of the first charging terminal EVm_1 among the charging terminals EVm_n is greater than the second preset deviation power threshold P_ev_limit2, 0 is output, indicating that the first charging terminal EVm_1 among the charging terminals EVm_n satisfies the charging demand and continues to perform the charging operation.

[0087] S703, it is determined whether the second historical charging deviation power of each charging terminal is greater than or equal to a third preset deviation power threshold.

[0088] The third preset deviation power threshold P_ev_limit3 can be selected according to actual conditions. 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; and the third preset deviation power threshold P_ev_limit3 is the same as or different from the second preset deviation power threshold P_ev_limit2.

[0089] S704, 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, it is determined that the second historical charging deviation power of the second charging terminal satisfies the corresponding deviation power condition.

[0090] In one possible implementation, a determination is made as to whether the second historical charging deviation power Pow_evmn_diff2 of the second charging terminal EVm_2 among the charging terminals EVm_n is greater than or equal to a third preset deviation power threshold P_ev_limit3. If so, that is, the second historical charging deviation power Pow_evmn_diff2 of the first charging terminal EVm_1 among the charging terminals EVm_n is greater than or equal to the third preset deviation power threshold P_ev_limit3, then a 1 is output, indicating that the second historical charging deviation power Pow_evmn_diff2 of the second charging terminal EVm_2 among the charging terminals EVm_n meets the corresponding deviation power condition, i.e., the charging requirement is met. If not, that is, the second historical charging deviation power Pow_evmn_diff2 of the second charging terminal EVm_2 among the charging terminals EVm_n is greater than the third preset deviation power threshold P_ev_limit3, then a 0 is output, indicating that the second charging terminal EVm_2 among the charging terminals EVm_n does not meet the charging requirement and needs to implement power limiting or switch the energy storage device DES to a discharge mode.

[0091] The operation control method of 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 among the charging terminals 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; 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 among the charging terminals 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. As a result, this application can meet precise capacity expansion needs and improve the reliability and operational safety of the energy storage charging system.

[0092] To facilitate understanding of the operation control method of the energy storage charging system, the embodiment of the present application further provides an example of obtaining the second total deviation power ∑Pow_diff2 of the energy storage charging system, which is further described below with reference to the accompanying drawings. Figure 13 This is a schematic diagram of the discharge capacity and power deviation of an energy storage charging system provided in an embodiment of the present application. Figure 13As shown, first, according to 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, the first historical charging deviation power Pow_evmn_diff1 of each charging terminal EVm_n is calculated according to the above formula (2). And it is determined whether the first historical charging deviation power Pow_evmn_diff1 of the first charging terminal EVm_1 among each charging terminal EVm_n is greater than or equal to the second preset deviation power threshold P_ev_limit2; then, according to the historical charging operation power data Pow_evmn_run of each charging terminal EVm_n and the preset charging terminal maximum operation power Pow_evmn_set_max, 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 among each charging terminal EVm_n is greater than or equal to the third The preset deviation power threshold value P_ev_limit3 is used. 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 value 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 value P_ev_limit3, then a target charging terminal whose first historical charging deviation power and second historical deviation power both meet the corresponding deviation power conditions is determined from each charging terminal, and 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).

[0093] The operation control method of the energy storage charging system provided in the present application calculates 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 determines whether the first historical charging deviation power of the first charging terminal among each charging terminal is greater than or equal to the second preset deviation power threshold; then, based on the historical charging operation power data of each charging terminal and the preset maximum operating power of the charging terminal, determines the second historical charging deviation power of each charging terminal, and determines whether the second historical charging deviation power of the second charging terminal among each charging terminal is greater than or equal to the third preset deviation power threshold. When the above two judgment conditions are met at the same time, the target charging terminal whose first historical charging deviation power and second historical deviation power both meet the corresponding deviation power conditions is determined from each charging terminal, and the first historical charging deviation power of each target charging terminal is summed to obtain the second total deviation power of the energy storage charging system. Therefore, the present application screens the target charging terminal and calculates the second total deviation power through dual dimensions to ensure accurate expansion needs and improve the reliability and operation safety of the energy storage charging system.

[0094] Figure 14 A schematic diagram of a method for controlling the operation of an energy storage charging system provided in an embodiment of the present application Figure 7 .like Figure 14 As shown, in the above method, the reserved capacity is determined according to the expansion demand power, including: S901: Time-integrate the capacity expansion demand powers of multiple time periods within a preset historical time period to obtain a total deviation capacity of the multiple time periods.

[0095] Among them, multiple time periods within the preset historical time period can be represented by Time_control_setp.

[0096] 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 the 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 following formula (6).

[0097] Wh_des_chg_allow Formula (6) Wherein, i is any moment in multiple time periods Time_control_setp.

[0098] The chargeable capacity Wh_des_chg_allow in the above formula (6) is used to represent the capacity that can be charged by the energy storage device DES.

[0099] 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, that is, the deviation capacity Wh_evmn_diff within multiple time periods Time_control_setp is obtained according to the following formula (7).

[0100] Wh_evmn_diff Formula (7) The deviation capacity Wh_evmn_diff in the above formula (7) is used to represent the capacity that the energy storage device DES needs to discharge, so as to achieve dynamic capacity expansion according to the deviation capacity.

[0101] Then, according to the rechargeable capacity Wh_des_chg_allow in the above formula (6) and the deviation capacity Wh_evmn_diff in the formula (7), the total deviation capacity WhX_diff of multiple time periods Time_control_setp is determined by the following formula (8).

[0102] WhX_diff=Wh_evmn_diff+Wh_des_chg_allow formula (8) Wherein, X=i in the total deviation capacity WhX_diff. The total deviation capacity WhX_diff is used to represent the total energy capacity that needs to be compensated during the time period.

[0103] S902: Determine a maximum deviation capacity from the total deviation capacities of multiple time periods as the reserved capacity.

[0104] For example, Figure 15 This is a schematic diagram of the reserved capacity and discharge cut-off state of charge parameters of an energy storage charging system provided in an embodiment of the present 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, that is, 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, that is, the energy storage charging system first performs a charging operation to obtain a first total deviation capacity WhX_diff_1; if not, that is, the difference between the total deviation capacity WhX_diff and the preset initial total deviation capacity Wh0_diff is less than 0, that is, the energy storage charging system first performs a charging operation to obtain a 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 capacity WhX_diff of multiple time periods as the reserved capacity WhX_diff_max.

[0105] The first total deviation capacity WhX_diff_1 represents the multiple deviation capacities in the charging operation of multiple time periods Time_control_setp within the preset historical time period; the second total deviation capacity WhX_diff_2 represents the multiple deviation capacities in the discharging operation of multiple time periods Time_control_setp within the preset historical time period.

[0106] 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 values ​​of multiple charging and discharging time periods can be calculated separately, that is, the total deviation capacity WhX_diff of multiple charging and discharging time periods can be obtained, and then a comparison is performed each time a charging and discharging period is added, and the larger value is taken as the reserved capacity WhX_diff_max.

[0107] The operation control method of the energy storage charging system provided in this application integrates the expansion demand power of multiple time periods within a preset historical time period separately, so as to adapt to the load characteristics of different time periods, obtain the total deviation capacity of multiple time periods, support energy storage scheduling in dynamic time periods, and improve the efficiency of the energy storage charging system; determine the maximum deviation capacity from the total deviation capacity of multiple time periods as the reserved capacity, and take the maximum energy gap in all time periods as the system reserved capacity. Therefore, this application can ensure the 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 the power standard but insufficient capacity, and thus avoid the dilemma of excessive redundancy and insufficient capacity.

[0108] Optionally, the operation control method of the energy storage charging system further includes: The discharge cut-off state of charge parameters of the energy storage device are determined based on the reserved capacity and the rated capacity of the energy storage device.

[0109] Among them, the rated capacity WhX_diff_des_rate of the energy storage device can be selected according to actual conditions.

[0110] In one possible implementation, continue to refer to the above Figure 15 According to the reserved capacity WhX_diff_max obtained above and the rated capacity WhX_diff_des_rate of the energy storage device DES, the discharge cut-off state of charge parameter SOC_des_deschg_stop of the energy storage device DES is obtained according to the following formula (9).

[0111] SOC_des_deschg_stop=1- Formula (9) The above formula (9) is used to indicate that when the energy storage device DES is discharged to the discharge cut-off state of charge parameter SOC_des_deschg_stop, it must stop working and retain the WhX_diff / WhX_diff_des_rate energy for capacity expansion needs.

[0112] It should be noted that, after obtaining the discharge cut-off 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).

[0113] E_reserve=Eavailable− Formula (10) Where Eavailable is the actual dischargeable energy of the energy storage system. The above formula (10) is used to illustrate that when the discharge cut-off 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.

[0114] The operation control method of the energy storage charging system provided in this application determines the discharge cut-off 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, avoid battery damage caused by excessive discharge, and thus improve the power supply reliability and emergency response capability of the energy storage charging system.

[0115] To facilitate understanding of the operation control method of the energy storage charging system, the embodiment of the present application further provides an example of a process of the operation control method of the energy storage charging system, which is further described below with reference to the accompanying drawings. Figure 16 A schematic diagram of a method for controlling the operation of an energy storage charging system provided in an embodiment of the present application Figure 8 .like Figure 16 As shown, the embodiment of the present application provides a schematic diagram Figure 8 This may include: S1001. Determine a charging time period for an energy storage charging system.

[0116] Specifically, in general, the charging time period of a day for the energy storage charging system is selected, that is, the preset historical time period of a day is selected for charging and discharging. Figure 4 The charging time period is divided.

[0117] S1002: Determine whether a first total deviation power of the energy storage charging system is less than or equal to a first preset deviation power threshold.

[0118] 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 so, step S1003 is executed; if not, step S1004 is executed.

[0119] S1003: Calculate the demand response of the preset charging equipment.

[0120] 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, the preset flag Flag_Diff_cal of the energy storage charging system is controlled to be 1, and any of the following solutions is executed: Solution 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.

[0121] Solution 2 (charging terminal level calculation): 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, the first historical charging deviation power Pow_evmn_diff1 of each charging terminal EVm_n is determined according to the above formula (2); then, based on the historical charging operation power data Pow_evmn_run of each charging terminal EVm_n and the preset charging terminal maximum operation power Pow_evmn_set_max, the second historical charging deviation power Pow_evmn_diff2 of each charging terminal is determined according to the above formula (4). Then, determine whether the first historical charging deviation power Pow_evmn_diff1 and the second historical deviation power Pow_evmn_diff2 of each charging terminal EVm_n simultaneously meet the corresponding deviation power conditions. If both conditions are met, determine the target charging terminal from each charging terminal whose first historical charging deviation power Pow_evmn_diff1 and second historical 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, the second total deviation power ∑Pow_diff2 of the energy storage charging system is obtained according to the above formula (5). Then, the second total deviation power ∑Pow_diff2 is integrated over multiple time periods within a preset historical time period to obtain the deviation capacity Wh_evmn_diff.

[0122] It should be noted that the above-mentioned solution 1 is to perform energy storage charging system-level response to the total charging demand power ∑Pow_evmn_need of multiple charging terminals, obtain the first total deviation power ∑Pow_diff1 and deviation capacity Wh_evmn_diff in the demand response of the preset charging device, and implement capacity expansion control of the energy storage device DES based on the first total deviation power ∑Pow_diff1 and deviation capacity Wh_evmn_diff; the above-mentioned solution 2 is to implement refined control of the charging demand power Pow_evmn_need of a single charging terminal, obtain the second total deviation power ∑Pow_diff2 and deviation capacity Wh_evmn_diff in the demand response of the preset charging device, and implement capacity expansion control of the energy storage device DES based on the second total deviation power ∑Pow_diff2 and deviation capacity Wh_evmn_diff.

[0123] S1004: Calculate the energy storage of the energy storage device.

[0124] 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, the preset flag bit Flag_Diff_cal of the energy storage charging system is controlled to be 0, and the chargeable power Pow_des_chg_allow is obtained according to the preset maximum operating power Pow_pcc_set_max of the PCC and the real-time operating power Pow_pcc_run of the PCC through the above formula (3). Then, the chargeable power Pow_des_chg_allow is integrated in a plurality of time periods Time_control_setp in a preset historical time period, that is, the chargeable capacity Wh_des_chg_allow in the plurality of time periods Time_control_setp is obtained according to the above formula (6). Further, the chargeable power Pow_des_chg_allow and the chargeable capacity Wh_des_chg_allow of the energy storage device DES are obtained, so as to charge the energy storage device according to the chargeable power Pow_des_chg_allow and the chargeable capacity Wh_des_chg_allow, and to perform the peak-valley arbitrage strategy to obtain the price difference income, thereby realizing the economy of the energy storage charging system.

[0125] S1005, calculate the reserved capacity and the discharge cut-off state of charge parameter of the energy storage charging system.

[0126] Specifically, the chargeable capacity Wh_des_chg_allow and the deviation capacity Wh_evmn_diff are used to determine the total deviation capacity WhX_diff of the plurality of time periods Time_control_setp through the above formula (8), and the maximum deviation capacity is determined from the total deviation capacity WhX_diff of the plurality of time periods as the reserved capacity WhX_diff_max.

[0127] Then, according to the obtained reserved capacity WhX_diff_max and the rated capacity WhX_diff_des_rate of the energy storage device DES, the discharge cut-off 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 cut-off state of charge parameter SOC_des_deschg_stop of the energy storage device DES, the standby power E_reserve of the energy storage device DES is obtained through the above formula (10), so as to meet the emergency power supply or grid frequency modulation demand.

[0128] The operation control method of the energy storage charging system provided in the present application determines the charging time period of the energy storage charging system, and by reasonably determining the charging time period, takes advantage of the off-peak electricity price to reduce the charging cost; determines whether the first total deviation power of the energy storage charging system is less than or equal to the first preset deviation power threshold; if so, calculates the demand response of the preset charging device; if not, calculates the energy storage of the energy storage device, and finally calculates the reserved capacity and discharge cut-off state of charge parameter of the energy storage charging system. Therefore, the present application can divide the energy storage capacity into working capacity and reserved capacity, wherein the working capacity (dispatchable capacity) is used to implement the peak-valley arbitrage strategy to obtain the electricity price difference profit and realize the economy of the energy storage charging system; the reserved capacity is used to adapt to the dynamic adjustment of the distribution capacity to convert the implicit power supply shortage problem into a calculable reserved capacity, so that the expansion target is clear and quantifiable, and then achieves the dual-objective optimization of arbitrage profit and expansion guarantee through capacity segmentation. At the same time, combined with the reserved capacity to quantify future demand and the discharge cut-off state of charge parameter to ensure the safety boundary, a complete closed loop from demand forecasting, capacity design to safety control is formed, thereby improving the safety and stability of the energy storage charging system.

[0129] Based on the same inventive concept, an operation control device for an energy storage and charging system is also provided in an embodiment of the present application. Since the principle of solving the problem by the device in the embodiment of the present application is similar to the operation control method for the energy storage and charging system in the embodiment of the present application, the implementation of the device can refer to the implementation of the method, and the repeated parts will not be repeated.

[0130] Figure 17 This is a schematic diagram of the structure of an operation control device of an energy storage charging system provided in an embodiment of the present application. Figure 17 As shown, the operation control device 1100 of the energy storage charging system may include: An acquisition module 1101 is configured to acquire historical charging operation 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 to control the expansion of the energy storage device.

[0131] In an optional embodiment, determination module 1102 is specifically configured to: determine a first total deviation power of the energy storage charging system based on historical charging operation power data of each charging terminal and corresponding historical charging demand power data; determine a required expansion power of the energy storage device based on the first total deviation power; and determine a reserved capacity based on the required expansion power.

[0132] In an optional embodiment, the determination module 1102 is specifically used to: determine the historical total charging operation power and the historical total charging demand 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; if the historical total charging operation power is less than the historical total charging demand power, 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.

[0133] In an optional embodiment, the determination module 1102 is specifically used to: determine a first total deviation power as the capacity expansion requirement power; or, if the first total deviation power is less than or equal to a 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 requirement power data; and determine the capacity expansion requirement power based on the first historical charging deviation power of each charging terminal.

[0134] In an optional embodiment, the determination module 1102 is specifically used to: determine the second historical charging deviation power of each charging terminal based on the historical charging operating power data of each charging terminal and the preset maximum operating power of the charging terminal; determine whether the first historical charging deviation power and the second historical deviation power of each charging terminal meet the corresponding deviation power conditions; determine the target charging terminal from each charging terminal whose first historical charging deviation power and second historical deviation power both meet the corresponding deviation power conditions; and 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 powers of each target charging terminal.

[0135] In an optional embodiment, the determination module 1102 is specifically used to: 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 each charging terminal is greater than or equal to the second preset deviation power threshold, 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 the third preset deviation power threshold; if the second historical charging deviation power of the second charging terminal among each charging terminal is greater than or equal to the third preset deviation power threshold, determine that the second historical charging deviation power of the second charging terminal meets the corresponding deviation power condition.

[0136] In an optional embodiment, the determination 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.

[0137] In an optional implementation, the operation control device 1100 is further configured to determine a discharge cut-off state of charge parameter of the energy storage device according to the reserved capacity and the rated capacity of the energy storage device.

[0138] It should be noted that for details not disclosed in the operation control device of the energy storage charging system in the embodiment of the present application, please refer to the details disclosed in the operation control method of the energy storage charging system in the embodiment of the present application, and the details will not be repeated here.

[0139] The above 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). For example, when a module is implemented by scheduling program code through a processing element, the processing element can be a general-purpose processor, such as a central processing unit (CPU) or other processor that can call program code. For another example, these modules can be integrated together and implemented in the form of a system-on-a-chip (SOC).

[0140] Optionally, an embodiment of the present application further provides a readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the processor executes the steps of the method for controlling the operation of the mobile storage medium energy storage and charging system described in the above embodiment. The specific implementation methods and technical effects are similar and will not be further described here.

[0141] In the several embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the functional units in the various embodiments of the present application can be integrated into a processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The above-mentioned integrated units can be implemented in the form of hardware or in the form of hardware plus software functional units.

[0142] The above-mentioned integrated unit implemented in the form of a software functional unit can be stored in a computer-readable storage medium. The above-mentioned software functional unit is stored in a storage medium and includes a number of instructions for causing a computer device (which can be a personal computer, server, or network device, etc.) or a processor (English: processor) to perform some steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: a USB flash drive, a mobile hard disk, a read-only memory (English: Read-Only Memory, abbreviated: ROM), a random access memory (English: Random Access Memory, abbreviated: RAM), a magnetic disk or an optical disk, and other media that can store program code. The above description is only an embodiment of the present application and is not intended to limit the scope of protection of the present application. For those skilled in the art, the present application can have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. An operation control method for an energy storage charging system, characterized in that: include; Obtaining historical charging operation power data of each charging terminal in the energy storage charging system within a preset historical time period; The reserved capacity of the energy storage device in the energy storage charging system is determined based on the historical charging operation power data of each charging terminal and the corresponding historical charging demand power data, and the reserved capacity is used to control the expansion of the energy storage device.

2. The operation control method of the energy storage charging system according to claim 1, characterized in that: The determining, based on the historical charging operation power data of each charging terminal and the corresponding historical charging demand power data, of the reserved capacity of the energy storage device in the energy storage charging system includes: determining a 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; determining a required capacity expansion power of the energy storage device according to the first total deviation power; The reserved capacity is determined according to the required power for capacity expansion.

3. The operation control method of the energy storage charging system according to claim 2, characterized in that: The determining, based on the historical charging operation power data of each charging terminal and the corresponding historical charging demand power data, a first total deviation power of the energy storage charging system includes: Determining the historical total charging operation power and the historical total charging demand 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; If the historical charging operation total power is less than the historical charging demand total power, the first total deviation power is calculated according to the power difference between the preset maximum operating power in the energy storage charging system and the historical charging demand total power.

4. The operation control method of the energy storage charging system according to claim 3, characterized in that: The determining, based on the first total deviation power, the required expansion power of the energy storage device includes: Determining the first total deviation power as the capacity expansion required power; Alternatively, if the first total deviation power is less than or equal to the first preset deviation power threshold, 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.

5. The operation control method of the energy storage charging system according to claim 4, characterized in that: The determining the required capacity expansion power according to the first historical charging deviation power of each charging terminal includes: determining a second historical charging deviation power for each charging terminal based on the historical charging operating 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 deviation power of each charging terminal meet corresponding deviation power conditions; Determining a target charging terminal from the charging terminals, wherein both the first historical charging deviation power and the second historical deviation power satisfy corresponding deviation power conditions; According to the sum of the first historical charging deviation powers of the target charging terminals, a second total deviation power of the energy storage charging system is calculated as the capacity expansion required power.

6. The operation control method of the energy storage charging system according to claim 5, characterized in that: The determining whether the first historical charging deviation power and the second historical deviation power of each charging terminal meet corresponding deviation power conditions includes: Determining whether a 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 among the charging terminals is greater than or equal to the second preset deviation power threshold, 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 among the charging terminals is greater than or equal to the third preset deviation power threshold, it is determined that the second historical charging deviation power of the second charging terminal meets the corresponding deviation power condition.

7. The operation control method of the energy storage charging system according to claim 2, characterized in that: The determining the reserved capacity according to the expansion required power includes: Performing time integration on the expansion demand powers in multiple time periods within the preset historical time period to obtain a total deviation capacity for the multiple time periods; A maximum deviation capacity is determined from the total deviation capacities of the multiple time periods as the reserved capacity.

8. The operation control method of the energy storage charging system according to claim 1, characterized in that: The method further comprises: A discharge cutoff state of charge parameter of the energy storage device is determined according to the reserved capacity and the rated capacity of the energy storage device.

9. A control device, characterized in that: include: 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 the method according to any one of claims 1 to 8.

10. An energy storage charging system, characterized in that: include: A control device, an energy storage device, at least one charging host, and a charging terminal 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 the method described in any one of claims 1 to 8; 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 to 8.

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