Anti-countercurrent control method and system of energy storage system, electronic device and storage medium

Abstract

The invention discloses an anti-countercurrent control method and system for an energy storage system, an electronic device and a storage medium, and the method comprises the steps: obtaining the real-time power of a power grid, and obtaining the current power needed by the energy storage system; calculating the total power of all energy storage devices in the energy storage system, and calculating the total load of a user by using the total power of all energy storage devices and the real-time power of the power grid; whether the total load of the user is larger than a preset first discharge forbidding threshold value or not is judged, if not, the power of each energy storage device is controlled to be 0, and if yes, the change relation between the value of the flexibility coefficient and the total load of the user is obtained, and the value of the flexibility coefficient is selected; the set power of the single energy storage device is calculated, and the required discharge power of the single energy storage device is calculated; taking a minimum value among the required discharge power, the rated power of each energy storage device and the set power; and judging whether the current discharge of the energy storage equipment is a negative value, if so, outputting a negative minimum value to the energy storage system, and if not, outputting a positive minimum value to the energy storage system.

Description

Technical Field

[0001] The present invention relates to the field of electric energy storage technology, and in particular to an anti-backflow control method, system, electronic device and storage medium for an energy storage system. Background Art

[0002] Domestic user-side energy storage systems are not allowed to deliver power to the grid. Reverse power is when the energy storage system's discharge power is greater than the load power and delivers power to the grid. When the energy storage system is discharging, reverse power will cause instability to the grid, damage to grid equipment, and waste electricity. Summary of the invention

[0003] The present invention provides a backflow prevention control method, system, electronic device and storage medium for an energy storage system, aiming to effectively solve the technical problems in the prior art that reverse power during discharge of the energy storage system may cause instability to the power grid, damage to equipment in the power grid and waste of electric energy.

[0004] According to a first aspect of the present invention, the present invention provides an anti-backflow control method for an energy storage system, wherein the energy storage system includes a plurality of energy storage devices, including: obtaining the real-time power of the power grid and obtaining the current power required by the energy storage system; when the current power is the discharge power of the energy storage system, calculating the total power of all energy storage devices in the energy storage system, and calculating the total user load using the total power of all energy storage devices and the real-time power of the power grid; judging whether the total user load is greater than a preset first discharge prohibition threshold, if not, controlling the power of each energy storage device to 0, and if greater, obtaining a predefined flexible The relationship between the value of the coefficient and the change of the total user load, and the value of the flexibility coefficient is selected according to the total user load and the change relationship; the set power of a single energy storage device is calculated using the flexibility coefficient, the total user load, the current power of the energy storage device, and the number of the energy storage devices, and the required discharge power of a single energy storage device is calculated; the minimum value is taken among the required discharge power, the rated power of each energy storage device, and the set power; it is determined whether the current discharge of the energy storage device is a negative value, if it is a negative value, the negative minimum value is output to the energy storage system, and if it is a positive value, the positive minimum value is output to the energy storage system.

[0005] Furthermore, before the step of calculating the total power of all energy storage devices in the energy storage system, the anti-backflow control method of the energy storage system also includes: setting the current power to a negative value, the current power represents the discharge power, and setting the current power to a positive value, the current power represents the charging power; judging whether the current power is a negative value, if it is a negative value, executing the step of calculating the total power of all energy storage devices in the energy storage system, and if it is a positive value, adjusting the execution cycle of the anti-backflow control method of the energy storage system.

[0006] Furthermore, the method for calculating the total power of all energy storage devices includes: obtaining the real-time power of all energy storage devices, calculating the sum of all energy storage devices, and taking the absolute value of the sum to obtain the total power of all energy storage devices.

[0007] Furthermore, the method for calculating the total user load includes: calculating the sum of the absolute values ​​of the total power and the real-time power of the power grid to obtain the total user load.

[0008] Furthermore, the method for calculating the set power of the single energy storage device is: calculating the power difference between the total user load and the current power of the energy storage device; calculating the quotient of the power difference and the number of the energy storage devices; calculating the product of the quotient and the flexibility coefficient to obtain the set power of the single energy storage device.

[0009] Furthermore, the calculation of the required discharge power of the single energy storage device includes: calculating the quotient of the current power and the number of the energy storage devices to obtain the current power of the energy storage device.

[0010] Furthermore, the value range of the flexibility coefficient is 0.95 to 1.05, and when the flexibility coefficient is 0.95, the real-time power of the power grid is the same as the first discharge prohibition threshold, and when the flexibility coefficient is 1.05, the real-time power of the user power grid is the second discharge prohibition threshold, wherein the second discharge prohibition threshold is greater than the first discharge prohibition threshold, and the value of the flexibility coefficient is positively linearly correlated with the real-time power of the power grid.

[0011] According to the second aspect of the present invention, the present invention also provides an anti-backflow control system for an energy storage system, the energy storage system includes a plurality of energy storage devices, including: a power acquisition module, used to obtain the real-time power of the power grid and obtain the current power required by the energy storage system; a power and load calculation module, used to calculate the total power of all energy storage devices in the energy storage system when the current power is the discharge power of the energy storage system; used to calculate the total user load using the total power of all energy storage devices and the real-time power of the power grid; a judgment execution module, used to judge whether the total user load is greater than a preset first discharge prohibition threshold, if not, the power of each energy storage device is controlled to be 0, if greater, a predefined soft load is obtained. The relationship between the value of the flexibility coefficient and the change of the total user load, and the value of the flexibility coefficient is selected according to the total user load and the change relationship; a discharge power calculation module is used to calculate the set power of a single energy storage device using the flexibility coefficient, the total user load, the current power of the energy storage device, and the number of the energy storage devices, and calculate the required discharge power of a single energy storage device; a minimum value taking module is used to take the minimum value among the required discharge power, the rated power of each energy storage device, and the set power; a power output module is used to determine whether the current discharge of the energy storage device is a negative value, if it is a negative value, output the negative minimum value to the energy storage system, if it is a positive value, output the positive minimum value to the energy storage system.

[0012] According to the third aspect of the present invention, the present invention also provides an electronic device, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the anti-backflow control method of the energy storage system described in any one of the above items is implemented.

[0013] According to another aspect of the present invention, the present invention further provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the anti-backflow control method of the energy storage system described in any one of the above items is implemented.

[0014] Through one or more of the above embodiments of the present invention, at least the following technical effects can be achieved:

[0015] In the technical solution disclosed in the present invention, the load power can be obtained by real-time detection of the real-time power of the power grid and the energy storage system. When the load power is less than the power required by the energy storage system, the discharge power of the energy storage system is controlled to be less than the load power, and the power of the power grid is always controlled to be around the current power of the energy storage system, so as to prevent the energy storage system from discharging and flowing back to the power grid to transmit electric energy, thereby increasing the efficiency of energy storage, reducing the instability caused to the power grid, reducing the damage to the equipment of the power grid, and reducing the waste of electric energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The technical solutions and other beneficial effects of the present invention will be made apparent by describing in detail the specific embodiments of the present invention in conjunction with the accompanying drawings.

[0017] Figure 1 A block diagram of the connection between the power grid and the energy storage system of the prior art method 1;

[0018] Figure 2 A connection block diagram of a power grid and an energy storage system in a second prior art method;

[0019] Figure 3 A flow chart of a method for preventing backflow in an energy storage system provided by an embodiment of the present invention;

[0020] Figure 4 A linear diagram of the values ​​of the flexibility coefficient λ and the real-time power of the power grid of the anti-backflow control method of the energy storage system provided by the embodiment of the present invention;

[0021] Figure 5 A framework diagram of an anti-backflow control system for an energy storage system provided by an embodiment of the present invention;

[0022] Figure 6 A block diagram of the connection between the anti-backflow control system of the energy storage system provided in an embodiment of the present invention and the power grid.

[0023] Figure 7 A schematic block diagram of the structure of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0024] The technical scheme in the embodiment of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiment of the present invention. Obviously, the described embodiment is only a part of the embodiment of the present invention, not all of the embodiments. Based on the embodiment of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0025] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the term "and / or" herein is merely a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " herein, unless otherwise specified, generally indicates that the associated objects before and after are in an "or" relationship.

[0026] Domestic user-side energy storage systems are not allowed to deliver electricity to the grid. Reverse power is when the output (discharge) power of the energy storage system is greater than the load power and delivers electricity to the grid. When the energy storage system is delivering (discharging), reverse power causes instability to the grid, damage to grid equipment, and waste of electricity.

[0027] In the prior art, the following methods are often used:

[0028] Method 1: If Figure 1 As shown, a reverse current prevention device is placed in the power grid. When 5% reverse rated current (or rated power) is detected within 2 seconds, the grid connection point circuit breaker of the energy storage system is directly cut off. Sudden power failure at the energy storage grid connection point will cause damage to the energy storage equipment and failure of electrical components.

[0029] Method 2: Figure 2 As shown, an anti-backflow device is placed in the power grid, and the EMS (energy management system) reads the power grid data of the anti-backflow device. The EMS sets a prohibited output power. When it detects that the power of the anti-backflow device is less than the set prohibited output power, the PCS (bidirectional inverter) is directly controlled to output zero power and shut down. This results in low output efficiency and utilization of the energy storage system.

[0030] The above two traditional methods have the following shortcomings:

[0031] 1. The action is taken only when reverse flow actually occurs, which has low timeliness and accuracy, and is likely to cause damage to some wearing parts of the energy storage equipment and waste of electric energy.

[0032] 2. Frequent switching of energy storage circuit breakers and control of the start-up and shutdown of energy storage equipment result in low charging and discharging efficiency and utilization rate of the entire energy storage system.

[0033] In order to solve the above problems, when the rated output of the energy storage system is greater than the load power, in order to prevent the output power of the energy storage system from flowing back into the power grid and causing unnecessary losses, the embodiments of the present application provide a backflow prevention control method, system, electronic device and storage medium for an energy storage system, which can solve the technical problems in the prior art that when the energy storage system is discharged, the reverse power will cause instability to the power grid, damage to the equipment of the power grid, and waste of electric energy.

[0034] Figure 3 The anti-backflow control method of the energy storage system provided by an embodiment of the present invention includes:

[0035] S101, obtaining the real-time power of the power grid and the current power required by the energy storage system;

[0036] S102, when the current power is the discharge power of the energy storage system, calculating the total power of all energy storage devices in the energy storage system, and calculating the total user load using the total power of all energy storage devices and the real-time power of the power grid;

[0037] S103, determining whether the total user load is greater than a preset first discharge prohibition threshold, if not, controlling the power of each energy storage device to be 0, if greater, obtaining a predefined relationship between the value of the flexibility coefficient and the total user load, and selecting a value of the flexibility coefficient according to the total user load and the relationship;

[0038] S104, calculating the set power of a single energy storage device by using the flexibility coefficient, the total user load, the current power of the energy storage device, and the number of energy storage devices, and calculating the required discharge power of the single energy storage device;

[0039] S105, taking the minimum value among the required discharge power, the rated power of each energy storage device, and the set power;

[0040] S106, determining whether the current discharge of the energy storage device is a negative value, if it is a negative value, outputting a negative minimum value to the energy storage system, and if it is a positive value, outputting a positive minimum value to the energy storage system.

[0041] In step S101, the anti-backflow control method of the energy storage system also includes setting the current power to represent the discharge power when the current power is a negative value, and the current power to represent the charging power when the current power is a positive value; judging whether the current power is a negative value, if it is a negative value, executing the step of calculating the total power of all energy storage devices in the energy storage system, and if it is a positive value, adjusting the execution cycle of the anti-backflow control method of the energy storage system.

[0042] In step S102, the method for calculating the total power of all energy storage devices includes: obtaining the real-time power of all energy storage devices, calculating the sum of all energy storage devices, and taking the absolute value of the sum to obtain the total power of all energy storage devices.

[0043] And in step S102, the method for calculating the total user load includes: calculating the sum of the absolute values ​​of the total power and the real-time power of the power grid to obtain the total user load.

[0044] In step S103, the value range of the flexibility coefficient is 0.95 to 1.05, and when the flexibility coefficient is 0.95, the real-time power of the power grid is the same as the first discharge prohibition threshold, and when the flexibility coefficient is 1.05, the real-time power of the user power grid is the second discharge prohibition threshold, wherein the second discharge prohibition threshold is greater than the first discharge prohibition threshold, and the value of the flexibility coefficient is positively linearly correlated with the real-time power of the power grid. For specific values, please refer to Table 1:

[0045] λ 0.95 0.97 0.98 0.99 1 1.01 1.02 1.03 1.04 1.05 <![CDATA[P d ]]> <![CDATA[P j ]]> <![CDATA[P d1 ]]> <![CDATA[P d2 ]]> <![CDATA[P d3 ]]> <![CDATA[P d4 ]]> <![CDATA[P d5 ]]> <![CDATA[P d6 ]]> <![CDATA[P d7 ]]> <![CDATA[P d8 ]]> <![CDATA[P m ]]>

[0046] Table 1 λ and real-time power P of the power grid d Comparison table of values

[0047] And in this embodiment, the meter power P d Value in P m and P j There is a positive linear correlation between them and the flexibility coefficient λ, such as Figure 4 As shown, the flexibility coefficient λ has a certain predictability. d becomes smaller, indicating that the user load is decreasing, the flexibility coefficient λ is reduced, and the output of the control energy storage system is reduced; when P d It becomes larger, indicating that the user load is increasing, the flexibility coefficient λ is increasing, and the output of the controlled energy storage system is increasing.

[0048] In step S104, the method for calculating the set power of the single energy storage device is: calculating the power difference between the total user load and the current power of the energy storage device; calculating the quotient of the power difference and the number of the energy storage devices; calculating the product of the quotient and the flexibility coefficient to obtain the set power of the single energy storage device.

[0049] And in step S104, the calculation of the required discharge power of the single energy storage device includes: calculating the quotient of the current power and the number of the energy storage devices to obtain the current power of the energy storage device.

[0050] The anti-backflow control method for the energy storage system provided in this embodiment can obtain the load power by real-time detection of the real-time power of the power grid and the energy storage system, and when the load power is less than the power required by the energy storage system, control the discharge power of the energy storage system to be less than the load power, and always control the power of the power grid to be around the current power of the energy storage system, so as to prevent the energy storage system from discharging and backflowing to the power grid to transmit electric energy, thereby increasing the efficiency of energy storage, reducing the instability caused to the power grid, reducing the damage to the equipment in the power grid, and reducing the waste of electric energy.

[0051] In addition, through the flexibility factor λ and the grid power P d In limiting the discharge threshold P x and the discharge prohibition threshold P j It is positively linearly correlated within the range, and it is predicted that the energy storage discharge power will increase as the load increases, thereby increasing the utilization rate of the energy storage system; the energy storage discharge will decrease as the load decreases, thereby reducing the risk of the energy storage system discharging in reverse to the power grid.

[0052] In some embodiments, the anti-backflow control method of the energy storage system further includes: after step S106 is completed, returning to the adjustment execution cycle T t steps.

[0053] It should also be noted that the anti-backflow control method for the energy storage system provided in the embodiment of the present application is to dynamically change the power on the incoming line side of the power grid in a certain area through a certain algorithm; quickly collect data and control the energy storage system at a certain interval, so that the output power of the energy storage system is always less than the load power. Therefore, the present application does not need to install traditional anti-backflow hardware devices on the power grid side, which reduces the use cost of the anti-backflow hardware devices compared to the prior art, and the anti-backflow control method for the energy storage system provided in the present embodiment provides a method for dynamically controlling the discharge of the energy storage system until it stops transmitting electricity to the power grid, without cutting off the circuit breaker of the energy storage grid connection point.

[0054] See also Figure 5 The embodiment of the present application also provides an anti-backflow control system for an energy storage system, comprising: a power acquisition module 1, a power and load calculation module 2, a judgment execution module 3, a discharge power calculation module 4, a minimum value module 5 and a power output module 6; the power acquisition module 1 is used to obtain the real-time power of the power grid and the current power required by the energy storage system; the power and load calculation module 2 is used to calculate the total power of all energy storage devices in the energy storage system when the current power is the discharge power of the energy storage system; and is used to calculate the total user load using the total power of all energy storage devices and the real-time power of the power grid; the judgment execution module 3 is used to determine whether the total user load is greater than a preset first discharge prohibition threshold, and if not, control the power of each energy storage device is 0, if it is greater than, then obtain the relationship between the value of the pre-defined flexibility coefficient and the change of the total user load, and select the value of the flexibility coefficient according to the total user load and the change relationship; the discharge power calculation module 4 is used to calculate the set power of a single energy storage device using the flexibility coefficient, the total user load, the current power of the energy storage device, and the number of the energy storage devices, and calculate the required discharge power of a single energy storage device; the minimum value taking module 5 is used to take the minimum value among the required discharge power, the rated power of each energy storage device, and the set power; the power output module 6 is used to determine whether the current discharge of the energy storage device is a negative value, if it is a negative value, output the negative minimum value to the energy storage system, if it is a positive value, output the positive minimum value to the energy storage system.

[0055] In this embodiment, the anti-backflow control system of the energy storage system also includes: a positive and negative value judgment module, which is used to set that when the current power is a negative value, the current power represents the discharge power, and when the current power is a positive value, the current power represents the charging power; judge whether the current power is a negative value, if it is a negative value, execute the step of calculating the total power of all energy storage devices in the energy storage system, and if it is a positive value, adjust the execution cycle of the anti-backflow control method of the energy storage system.

[0056] The power and load calculation module 2 includes: a total power calculation unit and a total load calculation unit. The total power calculation unit is used to obtain the real-time power of all energy storage devices, calculate the sum of all energy storage devices, and take the absolute value of the sum to obtain the total power of all energy storage devices. The total load calculation unit includes calculating the sum of the absolute values ​​of the total power and the real-time power of the power grid to obtain the total user load.

[0057] The discharge power calculation module 4 includes: a set power calculation unit and a required discharge power calculation unit, the set power calculation unit is used to calculate the power difference between the total user load and the current power of the energy storage device; calculate the quotient of the power difference and the number of the energy storage devices; calculate the product of the quotient and the flexibility coefficient to obtain the set power of the single energy storage device; the required discharge power calculation unit is used to calculate the quotient of the current power and the number of the energy storage devices to obtain the current power of the energy storage device.

[0058] In the judgment execution module 3, the value range of the flexibility coefficient is 0.95 to 1.05, and when the flexibility coefficient is 0.95, the real-time power of the power grid is the same as the first discharge prohibition threshold, and when the flexibility coefficient is 1.05, the real-time power of the user power grid is the second discharge prohibition threshold, wherein the second discharge prohibition threshold is greater than the first discharge prohibition threshold, and the value of the flexibility coefficient is positively linearly correlated with the real-time power of the power grid.

[0059] The anti-backflow control system of the energy storage system provided in the present application can obtain the load power by real-time detection of the real-time power of the power grid and the energy storage system, and when the load power is less than the power required by the energy storage system, control the discharge power of the energy storage system to be less than the load power, and always control the power of the power grid to be around the current power of the energy storage system, thereby preventing the energy storage system from discharging and backflowing to the power grid to transmit electric energy, increasing the efficiency of energy storage, reducing the instability caused to the power grid, reducing the damage to the equipment in the power grid, and reducing the waste of electric energy.

[0060] In addition, through the flexibility factor λ and the grid power P d In limiting the discharge threshold P x and the discharge prohibition threshold P j It is positively linearly correlated within the range, and it is predicted that the energy storage discharge power will increase as the load increases, thereby increasing the utilization rate of the energy storage system; the energy storage discharge will decrease as the load decreases, thereby reducing the risk of the energy storage system discharging in reverse to the power grid.

[0061] In addition, it should be noted that the anti-backflow control system of the energy storage system provided in the embodiment of the present application uses a certain algorithm to dynamically change the power on the incoming line side of the power grid in a certain area; by quickly collecting data and controlling the energy storage system at a certain interval, the output power of the energy storage system can be always less than the load power. Therefore, the present application does not need to install traditional anti-backflow hardware devices on the power grid side, such as Figure 6 As shown, the use cost of the anti-backflow hardware device is reduced compared with the prior art.

[0062] The present application embodiment provides an electronic device. Figure 7 The electronic device includes: a memory 601, a processor 602, and a computer program stored in the memory 601 and executable on the processor 602. When the processor 602 executes the computer program, the anti-backflow control method of the energy storage system described above is implemented.

[0063] Furthermore, the electronic device also includes: at least one input device 603 and at least one output device 604 .

[0064] The memory 601 , processor 602 , input device 603 and output device 604 are connected via a bus 605 .

[0065] The input device 603 may be a camera, a touch panel, a physical button or a mouse, etc. The output device 604 may be a display screen.

[0066] The memory 601 may be a high-speed random access memory (RAM) memory or a non-volatile memory, such as a disk memory. The memory 601 is used to store a set of executable program codes, and the processor 602 is coupled to the memory 601 .

[0067] Furthermore, the embodiment of the present application also provides a computer-readable storage medium, which may be disposed in the electronic device in each of the above embodiments, and the computer-readable storage medium may be the memory 601 in the above embodiments. The computer-readable storage medium stores a computer program, which, when executed by the processor 602, implements the anti-backflow control method of the energy storage system described in the above method embodiment.

[0068] Furthermore, the computer storable medium may also be a U disk, a mobile hard disk, a read-only memory (ROM), a RAM, a magnetic disk or an optical disk, or other medium that can store program codes.

[0069] 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 only schematic. For example, the division of the modules is only a logical function division. There may be other division methods in actual implementation, such as multiple modules or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or modules, which can be electrical, mechanical or other forms.

[0070] The modules described as separate components may or may not be physically separated, and the components shown as modules may or may not be physical modules, that is, they may be located in one place or distributed on multiple network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0071] In addition, each functional module in each embodiment of the present invention may be integrated into one processing module, or each module may exist physically separately, or two or more modules may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of software functional modules.

[0072] If the integrated module is implemented in the form of a software function module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention.

[0073] It should be noted that, for the convenience of description, the aforementioned method embodiments are all described as a series of action combinations, but those skilled in the art should be aware that the present invention is not limited by the described action sequence, because according to the present invention, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present invention.

[0074] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0075] In summary, although the present invention has been disclosed as above in terms of preferred embodiments, the above preferred embodiments are not intended to limit the present invention. A person skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope defined in the claims.

Claims

1. A backflow prevention control method for an energy storage system, the energy storage system comprising a plurality of energy storage devices, characterized in that: include: Obtain the real-time power of the power grid and obtain the current power required by the energy storage system; In the case where the current power is the discharge power of the energy storage system, the total power of all energy storage devices in the energy storage system is calculated, and the total user load is calculated using the total power of all energy storage devices and the real-time power of the power grid; Determine whether the total user load is greater than a preset first discharge prohibition threshold; if not, control the power of each energy storage device to be 0; if greater, obtain a predefined relationship between the value of the flexibility coefficient and the total user load, and select the value of the flexibility coefficient according to the total user load and the relationship; Calculate the set power of a single energy storage device by using the flexibility coefficient, the total user load, the current power of the energy storage device, and the number of the energy storage devices, and calculate the required discharge power of the single energy storage device; Taking the minimum value among the required discharge power, the rated power of each energy storage device, and the set power; Determine whether the current discharge of the energy storage device is a negative value, if it is a negative value, output the negative minimum value to the energy storage system, if it is a positive value, output the positive minimum value to the energy storage system.

2. The anti-backflow control method of the energy storage system according to claim 1, characterized in that: Before the step of calculating the total power of all energy storage devices in the energy storage system, the anti-backflow control method of the energy storage system further includes: When the current power is set to a negative value, the current power represents the discharging power, and when the current power is set to a positive value, the current power represents the charging power; Determine whether the current power is a negative value. If it is a negative value, execute the step of calculating the total power of all energy storage devices in the energy storage system. If it is a positive value, adjust the execution cycle of the anti-backflow control method of the energy storage system.

3. The anti-backflow control method of the energy storage system according to claim 1, characterized in that: The calculation method for the total power of all energy storage devices includes: The real-time power of all energy storage devices is obtained, and the sum of all energy storage devices is calculated, and the absolute value of the sum is taken to obtain the total power of all energy storage devices.

4. The anti-backflow control method of the energy storage system according to claim 1, characterized in that: The method for calculating the total user load includes: The sum of the absolute values ​​of the total power and the real-time power of the power grid is calculated to obtain the total user load.

5. The anti-backflow control method of the energy storage system according to claim 1, characterized in that: The calculation method for the set power of a single energy storage device is: Calculating the power difference between the total load of the user and the current power of the energy storage device; Calculating a quotient of the power difference and the number of the energy storage devices; The product of the quotient and the flexibility coefficient is calculated to obtain the set power of the single energy storage device.

6. The anti-backflow control method of the energy storage system according to claim 1, characterized in that: The calculation of the required discharge power of the single energy storage device includes: The quotient of the current power and the number of the energy storage devices is calculated to obtain the current power of the energy storage device.

7. The anti-backflow control method of the energy storage system according to claim 1, characterized in that: The value range of the flexibility coefficient is 0.95 to 1.05, and when the flexibility coefficient is 0.95, the real-time power of the power grid is the same as the first discharge prohibition threshold, and when the flexibility coefficient is 1.05, the real-time power of the user power grid is the second discharge prohibition threshold, wherein the second discharge prohibition threshold is greater than the first discharge prohibition threshold, and the value of the flexibility coefficient is positively linearly correlated with the real-time power of the power grid.

8. An anti-backflow control system for an energy storage system, characterized in that: include: The power acquisition module is used to obtain the real-time power of the power grid and the current power required by the energy storage system; A power and load calculation module, used to calculate the total power of all energy storage devices in the energy storage system when the current power is the discharge power of the energy storage system; Used to calculate the total load of users by using the total power of all the energy storage devices and the real-time power of the power grid; A judgment execution module, used to judge whether the total user load is greater than a preset first discharge prohibition threshold, if not, control the power of each energy storage device to be 0, if greater, obtain a predefined relationship between the value of the flexibility coefficient and the total user load, and select the value of the flexibility coefficient according to the total user load and the change relationship; A discharge power calculation module, used to calculate the set power of a single energy storage device by using the flexibility coefficient, the total user load, the current power of the energy storage device, and the number of the energy storage devices, and calculate the required discharge power of the single energy storage device; A minimum value taking module, used to take the minimum value among the required discharge power, the rated power of each energy storage device, and the set power; The power output module is used to determine whether the current discharge of the energy storage device is a negative value. If it is a negative value, the negative minimum value is output to the energy storage system; if it is a positive value, the positive minimum value is output to the energy storage system.

9. An electronic device comprising: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the method described in any one of claims 1 to 7 is implemented.

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

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