Method and device for controlling active power of multi-region grid-connected energy storage system

Abstract

The present application proposes a method and device for controlling the active power of a multi-regional grid-forming energy storage system, an electronic device, and a non-transitory computer-readable storage medium, wherein the method includes responding to a control instruction of the active power of the multi-regional grid-forming energy storage system, calculating the residual power imbalance using the residual power of the multi-regional grid-forming energy storage; using a preset system overall balance criterion to determine whether the multi-regional grid-forming energy storage system is power balanced; when the multi-regional grid-forming energy storage system is power balanced, controlling the active power of the multi-regional grid-forming energy storage system according to the residual power imbalance. According to an embodiment of the present application, the active power control strategy of each grid-forming energy storage is adjusted in real time according to the balance state of each area in the new energy power system and the imbalance of the residual power of the grid-forming energy storage, and balanced control of the residual power of the grid-forming energy storage is achieved under the premise of ensuring the stable off-grid operation of the system.

Description

Technical Field

[0001] The present application relates to the field of networking equipment control, and more specifically, to a method and device for controlling the active power of a multi-region networking energy storage system, an electronic device, and a non-transitory computer-readable storage medium. Background Art

[0002] In response to the production needs of large industrial and mining enterprises in remote areas that are difficult to cover by the power grid, building a large-capacity new energy power system with energy storage as the main power source has gradually become a reliable option. By configuring grid-building energy storage and photovoltaic, wind power and other grid power sources in multiple regions and connecting each region through interconnection lines, the construction of a large-area, large-capacity new energy power system can be achieved.

[0003] At present, grid-connected energy storage in power grid systems generally adopts droop characteristics to autonomously respond and maintain the voltage and frequency of the system. Due to factors such as cell inconsistency and control deviation, the remaining power of grid-connected energy storage can easily deviate greatly after long-term operation, affecting the control system's judgment on the overall regulation capability of grid-connected energy storage. In severe cases, it may even endanger the stability of off-grid system operation.

[0004] When operating off-grid, the control system of the grid-connected energy storage usually has functions such as secondary frequency and voltage regulation and SOC balancing. Most of the existing public SOC balancing adopts a centralized SOC balancing strategy, that is, all grid-connected energy storage in the system jointly participate in SOC balancing, and the SOC balancing regulation of the grid-connected energy storage is achieved through simultaneous charging and discharging. However, for the large-capacity new energy power system mentioned above, due to the use of long-distance transmission lines between regions, according to the previous SOC balancing control strategy, the control is relatively extensive, which is easy to cause unnecessary long-distance power transmission, greatly increasing the line transmission loss, reducing the economy of system operation, and affecting the user's return on investment. Summary of the invention

[0005] The present application aims to propose a method and device for controlling the active power of a multi-regional grid-connected energy storage system, an electronic device, and a non-transient computer-readable storage medium, so as to solve the problem of large losses when performing residual power balancing control on the multi-regional grid-connected energy storage system.

[0006] According to one aspect of the present application, a method for controlling the active power of a multi-regional grid-connected energy storage system is proposed, comprising: responding to a control instruction of the active power of the multi-regional grid-connected energy storage system, calculating a residual power imbalance degree using the residual power of the multi-regional grid-connected energy storage; judging whether the multi-regional grid-connected energy storage system is power balanced using a preset system overall balance criterion; and when the multi-regional grid-connected energy storage system is power balanced, controlling the active power of the multi-regional grid-connected energy storage system according to the residual power imbalance degree.

[0007] According to some embodiments, the method further includes: when the power of the multi-area grid-connected energy storage system is unbalanced, adjusting the grid-connected power source and / or load power of the multi-area grid-connected energy storage system to balance the power of the multi-area grid-connected energy storage system.

[0008] According to some embodiments, the active power of the multi-regional grid-connected energy storage system is controlled according to the residual power imbalance, including: judging whether the residual power imbalance is greater than a preset balance threshold; when the residual power imbalance is greater than the preset balance threshold, controlling the active power of the multi-regional grid-connected energy storage system according to a preset residual power balancing principle; when the residual power imbalance is less than or equal to the preset balance threshold, controlling the active power of the multi-regional grid-connected energy storage system according to a preset regional balance criterion.

[0009] According to some embodiments, the active power of the multi-regional grid-connected energy storage system is controlled according to a preset regional balance criterion, including: judging whether the power of each region is balanced according to the regional balance criterion; when the power of each region is balanced, controlling the active power of the multi-regional grid-connected energy storage system according to a preset local balance principle; when the power of each region is not balanced, controlling the active power of the multi-regional grid-connected energy storage system according to a preset nearby balance principle.

[0010] According to some embodiments, using a preset system balance criterion to determine whether the multi-regional grid-connected energy storage system is power balanced includes: determining whether the multi-regional grid-connected energy storage system is power balanced according to the following formula:

[0011]

[0012] in, For the i The load power of each area, For the i The grid power of each area, For the i The maximum allowable charging power of the regional grid energy storage, For the i The maximum allowable discharge power of the energy storage network is n, where n is the number of regions in the system.

[0013] According to some embodiments, the maximum allowable charging power of the regional grid-building energy storage and the maximum allowable discharging power of the regional grid-building energy storage respectively satisfy:

[0014]

[0015]

[0016] in, , Respectively i The maximum allowable charging and discharging coefficients of the regional grid energy storage, and , , For the i The rated active power of the regional grid energy storage is , They are the lower and upper limits of the allowed SOC respectively.

[0017] According to some embodiments, according to a preset remaining power balancing principle, controlling the active power of the multi-region grid-connected energy storage system includes:

[0018] If the grid energy storage is in the charging state as a whole, that is, ,but

[0019]

[0020] If the grid energy storage is in the discharge state as a whole, that is, ,but

[0021] At the same time, the active power target value of the grid energy storage is limited according to the maximum allowable charging and discharging power, that is,

[0022]

[0023] in, For the i The remaining power of the grid energy storage, For the j The remaining power of the grid energy storage, For the i The rated active power of the regional grid energy storage is For the j The rated active power of the regional grid energy storage is is the active power of the ith region.

[0024] According to some embodiments, judging whether the power of each region is balanced according to a preset regional balance criterion includes judging whether the power of each region is balanced according to the following formula:

[0025]

[0026] in, For the i The load power of each area, For the i The grid power of each area, For the i The maximum allowable charging power of the regional grid energy storage, For thei The maximum allowable discharge power of the energy storage network is n, where n is the number of regions in the system.

[0027] According to some embodiments, controlling the active power of the multi-regional grid-connected energy storage system according to a preset local balancing principle includes: controlling the active power of the multi-regional grid-connected energy storage system according to the following formula:

[0028]

[0029] in, For the i The target value of active power of energy storage in the balancing area network is For the i Balanced area load power, For the i A balancing area and the active power of the grid power supply.

[0030] According to some embodiments, the principle of local balance includes: the active power that cannot be balanced locally in the unbalanced area is shared by one or more grid-connected energy storage systems with a regulation margin and the closest power transmission distance, and the overall transmission distance of the active power that cannot be balanced locally in the unbalanced area is the shortest.

[0031] According to some embodiments, calculating the remaining power imbalance using the remaining power of multi-regional grid-connected energy storage includes: calculating the interquartile range, variance, standard deviation and / or coefficient of variation of the remaining power using the remaining power of the multi-regional grid-connected energy storage as the remaining power imbalance.

[0032] According to one aspect of the present application, a device for controlling the active power of a multi-regional grid-connected energy storage system includes: a residual power imbalance calculation unit for responding to a control instruction of the active power of the multi-regional grid-connected energy storage system and calculating the residual power imbalance using the residual power of multiple regions; a system power balance judgment unit for judging whether the multi-regional grid-connected energy storage system is power balanced using a preset system overall balance criterion; and a system active power control unit for controlling the active power of the multi-regional grid-connected energy storage system according to the residual power imbalance when the multi-regional grid-connected energy storage system is power balanced.

[0033] According to one aspect of the present application, an electronic device is proposed, comprising one or more processing units; a storage unit for storing one or more programs; when the one or more programs are executed by the one or more processing units, the one or more processing units implement the elimination method described in any of the previous embodiments.

[0034] According to one aspect of the present application, a non-transitory computer-readable storage medium is provided, on which computer-readable instructions are stored. When the instructions are executed by a processor, the processor executes the elimination method described in any of the previous embodiments.

[0035] According to the embodiments of the present application, the active power control strategies of various grid-building energy storages are adjusted in real time according to the balance status of various areas within the new energy power system and the imbalance of the remaining power of the grid-building energy storage. Under the premise of ensuring the stable off-grid operation of the system, balanced control of the remaining power of the grid-building energy storage is achieved, thereby reducing long-distance active power transmission, reducing the overall loss of system operation, and effectively improving the economy of the overall system operation.

[0036] It should be understood that the foregoing general description and the following detailed description are exemplary only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. By describing the exemplary embodiments in detail with reference to the drawings, the above and other objectives, features and advantages of the present application will become more apparent.

[0038] Figure 1 A flow chart of a method for controlling the active power of a multi-region grid-connected energy storage system according to an exemplary embodiment of the present application is shown.

[0039] Figure 2 A flow chart of another method for controlling the active power of a multi-region grid-connected energy storage system according to an exemplary embodiment of the present application is shown.

[0040] Figure 3 A schematic diagram of a multi-region grid-connected energy storage system according to an example embodiment of the present application is shown.

[0041] Figure 4 A schematic diagram of another multi-region grid-connected energy storage system according to an exemplary embodiment of the present application is shown.

[0042] Figure 5 A schematic diagram of another multi-region grid-connected energy storage system according to an exemplary embodiment of the present application is shown.

[0043] Figure 6 A block diagram of a device for controlling the active power of a multi-regional grid-connected energy storage system according to an exemplary embodiment of the present application is shown.

[0044] Figure 7 An electronic device according to an exemplary embodiment of the present application is shown. DETAILED DESCRIPTION

[0045] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this application will be comprehensive and complete and will fully convey the concepts of the example embodiments to those skilled in the art. In the figures, the same figures show the same or similar parts, and thus their repeated description will be omitted.

[0046] The user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with the relevant laws, regulations and standards of relevant countries and regions, and provide corresponding operation entrances for users to choose to authorize or refuse.

[0047] The described features, structures or characteristics may be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present disclosure. However, those skilled in the art will appreciate that the technical solutions of the present disclosure may be practiced without one or more of these specific details, or other modes, components, materials, devices or operations may be adopted. In these cases, known structures, methods, devices, implementations, materials or operations will not be shown or described in detail.

[0048] The flowcharts shown in the accompanying drawings are only exemplary and do not necessarily include all the contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps can be decomposed, and some operations / steps can be combined or partially combined, so the actual execution order may change according to actual conditions.

[0049] The terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices.

[0050] Before describing the embodiments of the present application, the terms appearing in the present application are first explained.

[0051] SOC (State of Charge): refers to the remaining capacity of the energy storage system that can provide electrical energy, usually expressed as a percentage. SOC is an important indicator for measuring the remaining capacity of the energy storage system, and can reflect how long the energy storage system can provide electricity.

[0052] The specific embodiments of the present application are described in detail below in conjunction with the accompanying drawings.

[0053] Figure 1 A flow chart of a method for controlling active power of a multi-region grid-connected energy storage system according to an exemplary embodiment of the present application is shown. Figure 1 The method shown includes steps S101, S103 and S105. Figure 1 , a method for controlling the active power of a multi-region grid-connected energy storage system according to an example embodiment of the present application is described in detail.

[0054] like Figure 1 As shown, in step S101, in response to a control instruction of the active power of the multi-regional grid-forming energy storage system, the residual power imbalance is calculated using the residual power of the multi-regional grid-forming energy storage.

[0055] According to an embodiment of the present application, the degree of imbalance includes, but is not limited to, being characterized by indicators such as interquartile range, variance, standard deviation, and coefficient of variation.

[0056] In a specific embodiment, the standard deviation is used to characterize the SOC imbalance of the grid energy storage.

[0057] In step S103, a preset system overall balance criterion is used to determine whether the multi-region grid-connected energy storage system is power balanced.

[0058] According to an embodiment of the present application, in step S103, it is determined whether the multi-region grid-connected energy storage system is power balanced according to formula (1).

[0059] (1)

[0060] in, is the load power of the ith region, is the grid power of the ith region, is the maximum allowable charging power of the energy storage network in the i-th region, is the maximum allowable discharge power of the grid energy storage in the i-th region, and n is the number of regions in the system.

[0061] In some embodiments, the maximum allowable charging power of the regional grid energy storage and the maximum allowable discharging power of the regional grid energy storage satisfy formula (2) and formula (3), respectively:

[0062] (2)

[0063] (3)

[0064] in, , Respectively i The maximum allowable charging and discharging coefficients of the regional grid energy storage, and , , For the i The rated active power of the regional grid energy storage is , They are the lower and upper limits of the allowed SOC respectively.

[0065] According to an embodiment of the present application, when the power of the multi-regional grid-connected energy storage system is unbalanced, the grid-connected power source and / or load power of the multi-regional grid-connected energy storage system is adjusted to balance the power of the multi-regional grid-connected energy storage system.

[0066] When the power of the multi-region grid-connected energy storage system is balanced, step S105 is executed.

[0067] In step S105, when the power of the multi-regional grid-connected energy storage system is balanced, the active power of the multi-regional grid-connected energy storage system is controlled according to the residual power imbalance.

[0068] According to an embodiment of the present application, in step S105, first, it is determined whether the remaining power imbalance is greater than a preset balance threshold, for example, the balance threshold is 10.

[0069] According to some embodiments, when the residual power imbalance is greater than a preset balance threshold, the active power of the multi-region grid-connected energy storage system is controlled according to a preset residual power balancing principle.

[0070] In a specific embodiment, if the grid energy storage is in a charging state as a whole, that is, , then formula (4) is used to control the active power of the multi-region grid-connected energy storage system.

[0071] (4)

[0072] If the grid energy storage is in the discharge state as a whole, that is, , then formula (5) is used to control the active power of the multi-region grid-connected energy storage system.

[0073] (5)

[0074] At the same time, the active power target value of the grid energy storage is limited according to the maximum allowable charging and discharging power, as shown in formula (6).

[0075] (6)

[0076] in, For the i The remaining power of the grid energy storage, For the j The remaining power of the grid energy storage, For the i The rated active power of the regional grid energy storage is For the j The rated active power of the regional grid energy storage is is the active power of the ith region.

[0077] In other embodiments, when the remaining power imbalance is less than or equal to a preset balance threshold, the active power of the multi-region grid-connected energy storage system is controlled according to a preset regional balance criterion.

[0078] According to an embodiment of the present application, the active power of the multi-regional grid-connected energy storage system is controlled according to a preset regional balance criterion, including judging whether the power of each region is balanced according to the regional balance criterion. When the power of each region is balanced, the active power of the multi-regional grid-connected energy storage system is controlled according to a preset local balance principle; when the power of each region is not balanced, the active power of the multi-regional grid-connected energy storage system is controlled according to a preset local balance principle.

[0079] For example, formula (7) is used to determine whether the power in each area is balanced.

[0080] (7)

[0081] in, For the i The load power of each area, For the i The grid power of each area, For the i The maximum allowable charging power of the regional grid energy storage, For the i The maximum allowable discharge power of the energy storage network is n, where n is the number of regions in the system.

[0082] When the power in each area is balanced, the active power of the multi-area grid-connected energy storage system is controlled according to the local balance principle shown in formula (8).

[0083] (8)

[0084] in, For the i The target value of active power of energy storage in the balancing area network is For the i Balanced area load power, For the i A balancing area and the active power of the grid power supply.

[0085] When the power in each area is not balanced, the principle of nearest balance is used to control the active power of the multi-area grid-connected energy storage system, including that the active power in the unbalanced area that cannot be balanced locally is shared by one or more grid-connected energy storage systems with adjustment margin at the closest power transmission distance, and the overall transmission distance of the active power that cannot be balanced locally in the unbalanced area is the shortest.

[0086] according to Figure 1 The embodiment shown adjusts the active power control strategy of each grid-building energy storage in real time according to the balance state of each area in the new energy power system and the imbalance of the remaining power of the grid-building energy storage. Under the premise of ensuring the stable off-grid operation of the system, the balanced control of the remaining power of the grid-building energy storage is achieved, thereby reducing long-distance active power transmission, reducing the overall loss of system operation, and effectively improving the economy of the overall system operation.

[0087] Figure 2 FIG. 2 shows another method flow chart of controlling the active power of a multi-region grid-connected energy storage system according to an exemplary embodiment of the present application. Figure 2 As shown, in step S201, the active power of the multi-region grid-connected energy storage system is collected. P GFM and the remaining charge SOC, and calculates the imbalance of the remaining charge SOC.

[0088] The imbalance degree can be characterized by indicators such as interquartile range, variance, standard deviation, coefficient of variation, etc. In this embodiment, the standard deviation is used to characterize the imbalance degree of the network energy storage SOC.

[0089] In step S203, the active power of the grid power sources in multiple regions is collected. P GFL and load power P Load .

[0090] In step S205, a preset system overall balance criterion is used to determine whether the multi-region grid-connected energy storage system is power balanced.

[0091] For example, formula (1) is used to determine whether the multi-region grid-connected energy storage system is power balanced.

[0092] When the power balance of the multi-region grid-connected energy storage system is unbalanced, step S207 is executed to adjust the grid power source or load power to achieve system balance; otherwise, step S209 is executed.

[0093] In step S209, it is determined whether the imbalance degree of the remaining power is greater than a preset balance degree threshold.

[0094] In some embodiments, the balance threshold is 10.

[0095] If the imbalance degree of the remaining power of the grid-connected energy storage is greater than the balance degree threshold, step S211 is executed to control the active power of the multi-region grid-connected energy storage system according to the preset remaining power balance principle; otherwise, step S213 is executed.

[0096] According to an embodiment of the present application, in step S211, the active power of the multi-region grid-connected energy storage system is controlled according to formulas (4) to (6).

[0097] In step S213, it is determined whether the power of each area is balanced according to the area balance criterion.

[0098] According to some embodiments, the regional balance criterion shown in formula (7) is used to determine whether the power of each region is balanced.

[0099] If the power of each area can be balanced, step S215 is executed to control the active power of the network energy storage according to the local balance principle; otherwise, step S217 is executed to control the active power of the network energy storage according to the nearby balance principle.

[0100] In some embodiments, the active power of the grid-connected energy storage is controlled according to the local balance principle shown in formula (8).

[0101] In other embodiments, the active power of the unbalanced area cannot be balanced locally The load is shared by one or more grid-connected energy storage units with the closest flow transmission distance and with regulation margin, and The overall transmission distance is the shortest.

[0102] Figure 3 A schematic diagram of a multi-region grid-connected energy storage system according to an exemplary embodiment of the present application is shown. Figure 3 The regional grid-connected energy storage system shown is divided into n areas, each area is equipped with grid-connected energy storage and other grid-connected power sources, where the grid-connected energy storage and other grid-connected power sources include but are not limited to photovoltaics, wind turbines, grid-connected energy storage, diesel generators, etc.

[0103] Figure 4 A schematic diagram of another multi-region grid-connected energy storage system according to an exemplary embodiment of the present application is shown. Figure 4 The multi-regional grid-connected energy storage system shown is a new energy power system in four regions, where the rated power of the energy storage system, the remaining power SOC, the active power of the grid power source and the load, and the distance between the regions are as follows: Figure 3 shown.

[0104] Below Figure 4 Taking the embodiment of the present application as an example, the implementation method is described in detail.

[0105] According to an embodiment of the present application, the overall system balance criterion of the multi-region grid-connected energy storage system is shown in formula (1), and the regional balance criterion is shown in formula (7).

[0106] In a specific embodiment, , All values ​​are taken as 0.8, then Figure 4 The 4-zone system shown can achieve power balance as a whole, and each zone can also achieve power balance. The standard deviation of the remaining power SOC (that is, the imbalance) is 3.77.

[0107] In some embodiments, the balance threshold of the remaining power SOC is 10.

[0108] Since the standard deviation of the remaining power SOC is less than the preset balance threshold, and according to formula (7), there is a power imbalance area. Therefore, according to the local balance principle, i The calculation formula for the active power target value of the energy storage grid in the four balancing areas is as shown in formula (8), and the active power target values ​​of the energy storage grid in the four areas are: -1.5MW, 4MW, -11MW, and 5MW, respectively. Among them, the positive value is the discharge power, and the negative value is the charging power.

[0109] After running continuously for a period of time according to the target value at this time, the remaining power SOC of the four-region grid energy storage changed to 70, 50, 87, and 55 respectively, and the standard deviation of the remaining power SOC became 14.43.

[0110] Since the standard deviation of the remaining power SOC is greater than the preset balance threshold, the active power of the multi-region grid-connected energy storage system is controlled according to formulas (4) to (6). According to the above calculation formula, the target active power values ​​of the grid energy storage are: -0.1MW, -1.03MW, -0.12MW, and -2.25MW respectively.

[0111] If changed Figure 4 After allocating the power ratios of each region, we can get Figure 5 The multi-region grid-connected energy storage system shown in the figure. According to the above judgment principle, the system power is balanced at this time, but the power in region 3 cannot be balanced locally.

[0112] According to an embodiment of the present application, the active power of the multi-region grid-connected energy storage system is controlled according to a preset local balance principle. The local balance principle includes the active power that cannot be balanced locally in the unbalanced area. The load is shared by one or more grid-connected energy storage units with the closest flow transmission distance and with regulation margin, and The overall transmission distance is the shortest.

[0113] like Figure 5 As shown, since the maximum allowable charging power of the grid-building energy storage in area 3 is 15*0.8=12MW, and the remaining power in the area is 13MW at this time, it is necessary to transfer 1MW of charging power to the nearest area with charging margin. At this time, the grid-building energy storage in area 2 is discharging 4MW, and the grid-building energy storage in area 4 is discharging 5MW. The grid-building energy storage in areas 2 and 4 both have charging margins. Considering the transmission distance of the charging power, the distance between areas 2 and 3 is 15km, and the distance between areas 3 and 4 is 17km. Therefore, the grid-building energy storage in area 2 is selected to share the 1MW charging power. At this time, the active power target values ​​of the grid-building energy storage in each area are adjusted to -1.5MW, 3MW, -12MW, and 5MW. Among them, the positive value is the discharge power, and the negative value is the charging power. After the standard deviation of the remaining power SOC is greater than the preset balance threshold due to long-term operation, the active power target value of the grid-building energy storage is calculated according to the above-mentioned preset remaining power balance principle, which will not be repeated here.

[0114] The above mainly introduces the embodiments of the present application from the perspective of the method. Those skilled in the art should easily appreciate that, in combination with the operations or steps of each example described in the embodiments disclosed herein, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Those skilled in the art can use different ways to implement the described functions for each specific operation or method, and such implementation should not be considered to be beyond the scope of the present application.

[0115] The following describes the device embodiments of the present application. For details not described in the device embodiments of the present application, reference can be made to the method embodiments of the present application.

[0116] Figure 6 A block diagram of a device for controlling active power of a multi-region grid-connected energy storage system according to an exemplary embodiment of the present application is shown, as shown in FIG. Figure 6 The device shown includes a remaining power imbalance calculation unit 601, a system power balance judgment unit 603 and a system active power control unit 605. The remaining power imbalance calculation unit 601 is used to respond to the control instruction of the active power of the multi-regional grid-forming energy storage system, and calculate the remaining power imbalance using the remaining power of multiple regional grid-forming energy storages; the system power balance judgment unit 603 is used to use a preset system overall balance criterion to determine whether the multi-regional grid-forming energy storage system is power balanced; the system active power control unit 605 is used to control the active power of the multi-regional grid-forming energy storage system according to the remaining power imbalance when the multi-regional grid-forming energy storage system is power balanced.

[0117] Figure 7 An electronic device according to an exemplary embodiment of the present application is shown. Figure 7 The electronic device 200 according to this embodiment of the present application is described. Figure 7The electronic device 200 shown is merely an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application.

[0118] like Figure 7 As shown, the electronic device 200 is in the form of a general computing device. The components of the electronic device 200 may include, but are not limited to: at least one processing unit 210, at least one storage unit 220, a bus 230 connecting different system components (including the storage unit 220 and the processing unit 210), a display unit 240, etc.

[0119] The storage unit stores program codes, which can be executed by the processing unit 210, so that the processing unit 210 executes the methods described in this specification according to various exemplary embodiments of the present application. For example, the processing unit 210 can execute the following: Figure 1 The method shown in .

[0120] The storage unit 220 may include a readable medium in the form of a volatile storage unit, such as a random access storage unit (RAM) 2201 and / or a cache storage unit 2202 , and may further include a read-only storage unit (ROM) 2203 .

[0121] The storage unit 220 may also include a program / utility 2204 having a set (at least one) of program modules 2205, such program modules 2205 including but not limited to: an operating system, one or more application programs, other program modules, and program data, each of which or some combination may include an implementation of a network environment.

[0122] Bus 230 may represent one or more of several types of bus structures, including a memory unit bus or memory unit controller, a peripheral bus, an accelerated graphics port, a processing unit, or a local bus using any of a variety of bus architectures.

[0123] The electronic device 200 may also communicate with one or more external devices 300 (e.g., keyboards, pointing devices, Bluetooth devices, etc.), may also communicate with one or more devices that enable a user to interact with the electronic device 200, and / or may communicate with any device that enables the electronic device 200 to communicate with one or more other computing devices (e.g., routers, modems, etc.). Such communication may be performed via an input / output (I / O) interface 250. In addition, the electronic device 200 may also communicate with one or more networks (e.g., a local area network (LAN), a wide area network (WAN), and / or a public network, such as the Internet) via a network adapter 260. The network adapter 260 may communicate with other modules of the electronic device 200 via a bus 230. It should be understood that, although not shown in the figure, other hardware and / or software modules may be used in conjunction with the electronic device 200, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems, etc.

[0124] Through the description of the above implementation methods, it is easy for those skilled in the art to understand that the example implementation methods described here can be implemented by software, or by combining software with necessary hardware. The technical solution according to the implementation method of the present application can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.) or on a network, including several instructions to enable a computing device (which can be a personal computer, a server, or a network device, etc.) to execute the above method according to the implementation method of the present application.

[0125] The software product can adopt any combination of one or more readable media. The readable medium can be a readable signal medium or a readable storage medium. The readable storage medium can be, for example, but not limited to, a system, device or device of electricity, magnetism, light, electromagnetic, infrared, or semiconductor, or any combination of the above. More specific examples (non-exhaustive list) of readable storage media include: an electrical connection with one or more wires, a portable disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above.

[0126] Computer readable storage media may include data signals propagated in baseband or as part of a carrier wave, wherein readable program codes are carried. Such propagated data signals may take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. The readable storage medium may also be any readable medium other than a readable storage medium, which may send, propagate, or transmit a program for use by or in conjunction with an instruction execution system, device, or device. The program codes contained on the readable storage medium may be transmitted using any suitable medium, including but not limited to wireless, wired, optical cable, RF, etc., or any suitable combination thereof.

[0127] Program code for performing the operations of the present application may be written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Java, C++, etc., and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user computing device, partially on the user device, as a separate software package, partially on the user computing device and partially on a remote computing device, or entirely on a remote computing device or server. In the case of a remote computing device, the remote computing device may be connected to the user computing device through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computing device (e.g., using an Internet service provider to connect through the Internet).

[0128] The computer-readable medium carries one or more programs. When the one or more programs are executed by a device, the computer-readable medium implements the aforementioned functions.

[0129] Those skilled in the art will appreciate that the above modules can be distributed in the device according to the description of the embodiment, or can be changed accordingly and only used in one or more devices different from the embodiment. The modules of the above embodiments can be combined into one module, or further divided into multiple sub-modules.

[0130] According to an embodiment of the present application, a computer program is provided, including a computer program or an instruction. When the computer program or the instruction is executed by a processor, the method described above can be executed.

[0131] The embodiments of the present application are described in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and its core idea of ​​the present application. At the same time, changes or deformations made by those skilled in the art based on the ideas of the present application, the specific implementation methods and the scope of application of the present application, all belong to the scope of protection of the present application. In summary, the content of this specification should not be construed as a limitation on the present application.

Claims

1. A method for controlling the active power of a multi-region grid-connected energy storage system, characterized in that: include: In response to the control instruction of the active power of the multi-regional grid-building energy storage system, the residual power imbalance is calculated using the residual power of the multi-regional grid-building energy storage; Using a preset system overall balance criterion, judging whether the multi-regional grid-connected energy storage system is power balanced, including judging whether the multi-regional grid-connected energy storage system is power balanced according to the following formula: ； When the power of the multi-regional grid-building energy storage system is balanced, controlling the active power of the multi-regional grid-building energy storage system according to the residual power imbalance degree includes: Determining whether the remaining power imbalance is greater than a preset balance threshold; When the residual power imbalance is greater than a preset balance threshold, the active power of the multi-region grid-connected energy storage system is controlled according to a preset residual power balancing principle; When the residual power imbalance is less than or equal to a preset balance threshold, the active power of the multi-region grid-connected energy storage system is controlled according to a preset regional balance criterion, including: Judging whether the power of each area is balanced according to the area balance criterion includes judging whether the power of each area is balanced according to the following formula: ； When the power in each area is balanced, the active power of the multi-area grid-connected energy storage system is controlled according to a preset local balance principle; When the power of each area is not balanced, the active power of the multi-area grid-connected energy storage system is controlled according to a preset nearby balancing principle; in, For the i The load power of each area, For the i The grid power of each area, For the i The maximum allowable charging power of the regional grid energy storage, For the i The maximum allowable discharge power of the energy storage network is n, where n is the number of regions in the system.

2. The method according to claim 1, characterized in that Also includes: When the power of the multi-area grid-connected energy storage system is unbalanced, the grid-connected power source and / or load power of the multi-area grid-connected energy storage system is adjusted to balance the power of the multi-area grid-connected energy storage system.

3. The method according to claim 1, characterized in that The maximum allowable charging power of the regional grid energy storage and the maximum allowable discharging power of the regional grid energy storage satisfy: in, , Respectively i The maximum allowable charging and discharging coefficients of the regional grid energy storage, and , , For the i The rated active power of the regional grid energy storage is For the i The remaining power of the grid energy storage, , They are the lower and upper limits of the allowed SOC respectively.

4. The method according to claim 1, characterized in that: According to a preset remaining power balancing principle, the active power of the multi-region grid-connected energy storage system is controlled, including: If the grid energy storage is in the charging state as a whole, that is, ,but , if the grid energy storage is in the discharge state as a whole, that is ,but At the same time, the active power target value of the grid energy storage is limited according to the maximum allowable charging and discharging power, that is, ,in, For the i The remaining power of the grid energy storage, For the j The remaining power of the grid energy storage, For the i The rated active power of the regional grid energy storage is For the j The rated active power of the regional grid energy storage is For the i Active power target value for each area.

5. The method according to claim 1, characterized in that The active power of the multi-region grid-connected energy storage system is controlled according to a preset local balance principle, including: The active power of the multi-area grid-connected energy storage system is controlled according to the following formula: in, For the i The target value of active power of energy storage in the balancing area network is For the i Balanced area load power, For the i A balancing area and the active power of the grid power supply.

6. The method according to claim 2, characterized in that The proximity balance principle includes: The active power that cannot be balanced locally in the unbalanced area is shared by one or more grid-connected energy storage systems with the closest power transmission distance and regulation margin, and the overall transmission distance of the active power that cannot be balanced locally in the unbalanced area is the shortest.

7. The method according to claim 1, characterized in that The remaining power of multi-region grid energy storage is used to calculate the remaining power imbalance, including: The remaining power of the multi-region grid-building energy storage is used to calculate the interquartile range, variance, standard deviation and / or coefficient of variation of the remaining power as the remaining power imbalance degree.

8. A device for controlling the active power of a multi-region grid-connected energy storage system, characterized in that: For implementing the method according to any one of claims 1 to 7, the device comprises: A remaining power imbalance calculation unit, used to calculate the remaining power imbalance using the remaining power of the multi-regional grid-building energy storage system in response to a control instruction of the active power of the multi-regional grid-building energy storage system; A system power balance judgment unit, used to judge whether the multi-region grid-connected energy storage system is power balanced by using a preset system overall balance criterion; A system active power control unit is used to control the active power of the multi-area grid-forming energy storage system according to the residual power imbalance when the power of the multi-area grid-forming energy storage system is balanced.

9. An electronic device, comprising: processor; as well as A memory storing a computer program, which, when executed by the processor, enables the processor to perform the method according to any one of claims 1 to 7.

10. A non-transitory computer-readable storage medium having computer-readable instructions stored thereon, which, when executed by a processor, causes the processor to execute the method according to any one of claims 1 to 7.

Images