Working mode control method and device

Abstract

The embodiment of the invention provides a working mode control method and device, which can improve the consistency of the service life of each energy storage subsystem in an energy storage system. The method is applied to the energy storage system, the energy storage system comprises at least one first energy storage subsystem and at least one second energy storage subsystem, and the method comprises the following steps: obtaining the operation duration of each first energy storage subsystem in the at least one first energy storage subsystem in a first working mode; and switching the working mode of a first target energy storage subsystem in the at least one first energy storage subsystem from the first working mode to a second working mode under the condition that the operation duration of at least part of the first energy storage subsystem in the at least one first energy storage subsystem exceeds a preset operation duration, and switching a second target energy storage subsystem in the at least one second energy storage subsystem from the second working mode to the first working mode.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a method and apparatus for controlling operating modes. Background Technology

[0002] With the promotion and application of new energy sources such as solar and wind power, energy storage technology has also developed accordingly. Currently, grid-connected energy storage lacks the ability to actively support the power grid. When connected to the grid on a large scale, it is prone to problems such as loss of inertia and oscillation instability. Moreover, grid-connected energy storage can only operate in grid-connected mode and cannot operate in off-grid mode.

[0003] To adapt to the characteristics of long transmission distances and low grid inertia in some areas rich in renewable energy sources, and to improve the reliability of off-grid operation, grid-based energy storage has emerged. However, grid-based energy storage is prone to problems such as inconsistent service life among multiple energy storage subsystems. Summary of the Invention

[0004] This application provides a method and apparatus for controlling operating modes, which can improve the consistency of lifespan among various energy storage subsystems in an energy storage system.

[0005] In a first aspect, a method for controlling operating modes is provided, applied to an energy storage system, the energy storage system including at least one first energy storage subsystem and at least one second energy storage subsystem, the method comprising: obtaining the operating time of each first energy storage subsystem in the at least one first energy storage subsystem in a first operating mode; and, if the operating time of at least some of the first energy storage subsystems in the at least one first energy storage subsystem exceeds a preset operating time, switching the operating mode of a first target energy storage subsystem in the at least one first energy storage subsystem from the first operating mode to a second operating mode, and switching the operating mode of a second target energy storage subsystem in the at least one second energy storage subsystem from the second operating mode to the first operating mode.

[0006] In this embodiment of the application, when the operating time of an energy storage subsystem operating in the first operating mode exceeds the pre-running time, the operating mode of at least some energy storage subsystems is switched from the first operating mode to the second operating mode, and the operating mode of energy storage subsystems operating in the second operating mode is switched from the second operating mode to the first operating mode. That is, the energy storage subsystems in the energy storage system alternately operate in the first operating mode, so that the operating time of each energy storage subsystem in the first operating mode and the second operating mode can be consistent, thereby improving the consistency of the lifespan among the various energy storage subsystems in the energy storage system.

[0007] In some possible implementations, the number of the first target energy storage subsystems is the same as the number of the second target energy storage subsystems.

[0008] In this way, after multiple operating cycles, the duration of each energy storage subsystem operating in the two working modes can be made as consistent as possible, thereby further aligning the lifespans of the various energy storage subsystems.

[0009] In some possible implementations, the method further includes: in the at least one second energy storage subsystem, determining the second target energy storage subsystem based on the number of times each second energy storage subsystem operates in the first operating mode.

[0010] Since different operating modes result in different lifespan losses for energy storage subsystems, the above technical solution determines the second target energy storage subsystem based on the number of times each second energy storage subsystem operates in the first operating mode. This ensures that the number of times each energy storage subsystem in the energy storage system operates in the first operating mode is as similar as possible, thereby improving the consistency of lifespan among the various energy storage subsystems in the energy storage system.

[0011] In some possible implementations, determining the second target energy storage subsystem based on the number of times each second energy storage subsystem operates in the first operating mode includes: identifying the N second energy storage subsystems that operate the fewest times in the first operating mode as the second target energy storage subsystems, where N is a positive integer.

[0012] Since different operating modes result in different lifespan losses for energy storage subsystems, the above technical solution identifies the N second energy storage subsystems that operate the fewest times in the first operating mode as the second target energy storage subsystems that need to switch operating modes. In this way, the number of times each energy storage subsystem operates in the first operating mode can be as similar as possible, so that the lifespan of each energy storage subsystem can be made as consistent as possible.

[0013] In some possible implementations, the method further includes: adjusting the number of times the at least one first energy storage subsystem and the at least one second energy storage subsystem operate in the first operating mode.

[0014] Even when operating under the same mode (e.g., in the first operating mode), different energy storage subsystems will still have different State of Charge (SOC). Therefore, the above technical solution adjusts the number of times at least some energy storage subsystems operate in the first operating mode. This allows, for example, in the next cycle, a second target energy storage subsystem to be determined based on the adjusted number of operations, further improving the likelihood of lifespan consistency among different energy storage subsystems within the energy storage system.

[0015] In some possible implementations, adjusting the number of times the at least one first energy storage subsystem and the at least one second energy storage subsystem operate in the first operating mode includes: obtaining the state of energy (SOH) of each first energy storage subsystem and the state of energy (SOH) of each second energy storage subsystem in the at least one first energy storage subsystem; and adjusting the number of times the at least one first energy storage subsystem and the at least one second energy storage subsystem operate in the first operating mode based on the state of energy (SOH) of each first energy storage subsystem and the state of energy (SOH) of each second energy storage subsystem.

[0016] Since the SOH of the energy storage subsystem is closely related to its lifespan, adjusting the number of operations in the first working mode according to the SOH of the energy storage subsystem can make the lifespan of each energy storage subsystem in the energy storage system as consistent as possible.

[0017] In some possible implementations, adjusting the number of operations of at least one first energy storage subsystem and at least one second energy storage subsystem in the first operating mode based on the SOH of each first energy storage subsystem and the SOH of each second energy storage subsystem includes: identifying first and second energy storage subsystems with SOH below a SOH threshold as adjusted energy storage subsystems; increasing the number of operations of the adjusted energy storage subsystem in the first operating mode if a first rate is greater than a second rate; and decreasing the number of operations of the adjusted energy storage subsystem in the first operating mode if a first rate is less than a second rate; wherein the first rate is the rate at which the SOH of each first energy storage subsystem and the SOH of each second energy storage subsystem decreases in the first operating mode, and the second rate is the rate at which the SOH of each first energy storage subsystem and the SOH of each second energy storage subsystem decreases in the second operating mode.

[0018] The above technical solution adjusts the number of times energy storage subsystems with a SOH below the SOH threshold operate in the first operating mode. If the lifespan loss of an energy storage subsystem is significant in the first operating mode, the number of operations is increased. In this way, in the next cycle, the energy storage subsystem with a shorter lifespan operates in the first operating mode less often, resulting in less lifespan loss for that subsystem in the next cycle. Conversely, if the lifespan loss of an energy storage subsystem is small in the first operating mode, the number of operations is decreased. In this way, in the next cycle, the energy storage subsystem with a shorter lifespan operates in the first operating mode more often, resulting in greater lifespan loss for that subsystem in the next cycle. This effectively improves the consistency of lifespan among the various energy storage subsystems in the energy storage system.

[0019] In some possible implementations, the method further includes: recording the number of times each of the at least one first energy storage subsystem and each of the at least one second energy storage subsystem operates in the first operating mode.

[0020] The above technical solution records the number of times each energy storage subsystem operates in the first working mode. In this way, when switching the working mode based on the number of times the energy storage subsystem operates in the first working mode, the possibility of incorrect working mode switching due to incorrect determination of the number of operations is reduced, the accuracy of switching is improved, and the lifespan of each energy storage subsystem is maximized to be consistent.

[0021] In some possible implementations, switching the operating mode of the first target energy storage subsystem from the first operating mode to the second operating mode, and switching the second target energy storage subsystem in the at least one second energy storage subsystem from the second operating mode to the first operating mode, includes: sending indication information, the indication information being used to indicate switching the operating mode of the first target energy storage subsystem from the first operating mode to the second operating mode, and switching the second target energy storage subsystem from the second operating mode to the first operating mode.

[0022] The above technical solution achieves the switching of the working mode of the energy storage subsystem by sending instruction information, which is not only simple to implement but also low in cost.

[0023] In some possible implementations, the first operating mode is a voltage source mode and the second operating mode is a current source mode.

[0024] Since, under normal circumstances, the number of energy storage subsystems operating in voltage source mode is less than the number operating in current source mode, the above technical solution reduces the computational load and effectively improves switching efficiency by obtaining the operating time of the first energy storage subsystem in voltage source mode and switching the operating mode of the energy storage subsystem when the operating time of some first energy storage subsystems exceeds the preset operating time.

[0025] Secondly, a device for controlling operating modes is provided, applied to an energy storage system, the energy storage system including at least one first energy storage subsystem and at least one second energy storage subsystem, comprising: an acquisition unit, configured to acquire the operating time of each first energy storage subsystem in a first operating mode in the at least one first energy storage subsystem; and a switching unit, configured to, when the operating time of at least some first energy storage subsystems in the at least one first energy storage subsystem exceeds a preset operating time, switch the operating mode of a first target energy storage subsystem in the at least one first energy storage subsystem from the first operating mode to a second operating mode, and switch the operating mode of a second target energy storage subsystem in the at least one second energy storage subsystem from the second operating mode to the first operating mode.

[0026] In some possible implementations, the number of the first target energy storage subsystems is the same as the number of the second target energy storage subsystems.

[0027] In some possible implementations, the apparatus further includes a determining unit, configured to determine the second target energy storage subsystem in the at least one second energy storage subsystem based on the number of times each second energy storage subsystem operates in the first operating mode.

[0028] In some possible implementations, the determining unit is specifically used to: determine the N second energy storage subsystems that have the fewest runs in the first working mode as the second target energy storage subsystem, where N is a positive integer.

[0029] In some possible implementations, the device further includes an adjustment unit for adjusting the number of times the at least one first energy storage subsystem and the at least one second energy storage subsystem operate in the first operating mode.

[0030] In some possible implementations, the acquisition unit is further configured to: acquire the State of Health (SOH) of each first energy storage subsystem in the at least one first energy storage subsystem and the State of Health of each second energy storage subsystem in the at least one second energy storage subsystem; the adjustment unit is specifically configured to: adjust the number of times the at least one first energy storage subsystem and the at least one second energy storage subsystem operate in the first working mode based on the State of Health of each first energy storage subsystem and the State of Health of each second energy storage subsystem.

[0031] In some possible implementations, the adjustment unit is specifically used to: identify a first energy storage subsystem and a second energy storage subsystem whose SOH is lower than the SOH threshold as adjustment energy storage subsystems; increase the number of times the adjustment energy storage subsystem operates in the first operating mode when the first rate is greater than the second rate; and decrease the number of times the adjustment energy storage subsystem operates in the first operating mode when the first rate is less than the second rate; wherein the first rate is the rate at which the SOH of each first energy storage subsystem and the SOH of each second energy storage subsystem decreases in the first operating mode, and the second rate is the rate at which the SOH of each first energy storage subsystem and the SOH of each second energy storage subsystem decreases in the second operating mode.

[0032] In some possible implementations, the device further includes a recording unit for recording the number of times each of the at least one first energy storage subsystem and each of the at least one second energy storage subsystem operates in the first operating mode.

[0033] In some possible implementations, the device further includes: a communication unit for transmitting instruction information, the instruction information being used to instruct the first target energy storage subsystem to switch its operating mode from the first operating mode to the second operating mode, and the second target energy storage subsystem to switch its operating mode from the second operating mode back to the first operating mode.

[0034] In some possible implementations, the first operating mode is a voltage source mode and the second operating mode is a current source mode.

[0035] Thirdly, an apparatus for controlling a working mode is provided, comprising a processor and a memory, wherein the memory is used to store a computer program, and the processor is used to invoke the computer program to execute the methods described in the first aspect or its various implementations.

[0036] Fourthly, a computer-readable storage medium is provided for storing a computer program that causes a computer to perform the methods described in the first aspect or its implementations. Attached Figure Description

[0037] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0038] The accompanying drawings are not drawn to scale.

[0039] Figure 1 This is a schematic diagram of an application scenario of a grid-type energy storage power station according to an embodiment of this application.

[0040] Figure 2 This is a schematic diagram of a method for controlling the working mode according to an embodiment of this application.

[0041] Figure 3 This is a schematic block diagram of a device for controlling the working mode according to an embodiment of this application.

[0042] Figure 4 This is a schematic block diagram of a device for controlling the working mode according to an embodiment of this application. Detailed Implementation

[0043] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this application by way of example, but should not be used to limit the scope of this application, that is, this application is not limited to the described embodiments.

[0044] In the description of this application, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," etc., indicating orientation or positional relationships are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0045] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having" and any variations thereof in the description, claims and foregoing drawings of this application are intended to cover non-exclusive inclusion.

[0046] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0047] With the widespread application of new energy sources such as solar and wind power, energy storage technology has also developed accordingly. However, the intermittent and fluctuating characteristics of wind and photovoltaic power generation pose certain challenges to the stability of the power grid. As a massive inertial system, the power grid needs to maintain a constant balance between inertia and active power. In the past, during the era dominated by thermal power generation, synchronous generators were crucial for ensuring the stability of the power system. In modern power industry, synchronous generators are widely used in hydropower, thermal power, nuclear power, and diesel generators. Because synchronous generators generally use DC exciters, when operating independently, the generator voltage can be easily adjusted by regulating the excitation current, providing inertia and primary frequency regulation to the grid. According to the rotor motion equation, when there is a shortage of active power in the grid, the generator rotor accelerates, and the grid frequency increases; conversely, the grid frequency decreases. However, with the increasing proportion of new energy power generation, maintaining grid stability has become increasingly difficult.

[0048] There is a fundamental difference between renewable energy generation and synchronous generator generation. Existing renewable energy sources generally lack inertia support capabilities. Renewable energy generation such as wind and solar power requires inverters to be connected to the grid. These power electronic inverters have advantages such as flexible control and rapid response. However, with the increasing number of power electronic devices in the power system, the low inertia, low damping, and weak voltage support characteristics of these devices can affect the stable operation of the power system.

[0049] Grid-based energy storage with voltage source characteristics has attracted widespread attention because it can effectively improve problems such as the lack of rotational inertia in power systems. Grid-based energy storage allows energy storage systems to achieve operating characteristics similar to synchronous generators, actively building the electromotive force necessary for stable system operation in the pre-, during, and post-disturbance stages of power system disturbances. This has the following four important implications for the power grid.

[0050] I. Improve frequency stability. Provides real inertia support, enabling natural and instantaneous power output after frequency disturbances occur in the external power grid, thus reducing the rate of change in grid frequency.

[0051] Second, it can mitigate voltage fluctuations. Especially in the vicinity of UHVDC lines where new energy sources are concentrated, commutation failure can lead to transient overvoltages in the AC system. Grid-based energy storage can mitigate rapid voltage changes through timely response, avoiding the response lag and reverse adjustment problems of conventional grid-based dynamic reactive power compensation devices.

[0052] Third, improve the short-circuit ratio of multiple renewable energy sites. Grid-based energy storage exhibits the external characteristics of an independent voltage source, equivalent to a parallel voltage source on the main grid side. This can indirectly change the short-circuit impedance on the system side, increase the short-circuit current, and thus increase the short-circuit capacity, supporting the access of more renewable energy sources.

[0053] IV. Enhancing the adaptability of the "three lines of defense" under the new power system. With the continuous integration of new energy sources, grid-connected new energy units exhibit current source characteristics, and there are problems such as insufficient short-circuit capacity during faults. Traditional current protection cannot adapt to these issues. By configuring grid-connected energy storage, the proportion of voltage source equipment such as synchronous generators in the system can be effectively increased, and the traditional "three lines of defense" can still be used.

[0054] However, in grid-based energy storage, the service life of multiple energy storage subsystems is often inconsistent.

[0055] Based on this, this application proposes a method for operating mode control. By acquiring the runtime of a first energy storage subsystem in a first operating mode, and when the runtime of at least some of the first energy storage subsystems exceeds a preset runtime, the operating mode of a first target energy storage subsystem within at least one of the first energy storage subsystems is switched from the first operating mode to a second operating mode. Simultaneously, the operating mode of a second target energy storage subsystem within at least one of the second energy storage subsystems is switched from the second operating mode back to the first operating mode. In this way, the energy storage subsystems in the energy storage system alternately operate in the first operating mode, ensuring that the runtime of each energy storage subsystem in the first and second operating modes is consistent, thereby improving the consistency of lifespan among the various energy storage subsystems in the energy storage system.

[0056] The working mode control method of this application embodiment can be applied to grid-type energy storage. Figure 1 A schematic diagram illustrating an application scenario for grid-based energy storage is shown. A grid-based energy storage power station comprises multiple energy storage subsystems, which operate in both voltage source and current source modes. For example... Figure 1 As shown, the grid-type energy storage power station includes five energy storage subsystems, including one voltage source energy storage subsystem and four current source energy storage subsystems. The voltage source energy storage subsystem is used to provide high voltage and frequency, and the current source energy storage subsystems operate according to the voltage and frequency provided by the voltage source energy storage subsystem.

[0057] Figure 2 A schematic flowchart of a method 200 for controlling an operating mode according to an embodiment of this application is shown. Method 200 can be applied to an energy storage system, such as a grid-type energy storage system. The energy storage system may include at least one first energy storage subsystem and at least one second energy storage subsystem. Optionally, method 200 can be executed by a control module in the energy storage system, and the control mode may be executed by, for example, an energy management system (EMS).

[0058] Method 200 may include at least some of the following.

[0059] S210: Obtain the runtime of each first target energy storage subsystem in the first working mode in at least one first energy storage subsystem.

[0060] S220: If the operating time of at least some of the first energy storage subsystems in at least one first energy storage subsystem exceeds the preset operating time, the operating mode of the first target energy storage subsystem in at least one first energy storage subsystem is switched from the first operating mode to the second operating mode, and the operating mode of the second target energy storage subsystem in at least one second energy storage subsystem is switched from the second operating mode to the first operating mode.

[0061] In this embodiment of the application, when the operating time of an energy storage subsystem operating in the first operating mode exceeds the pre-running time, the operating mode of at least some energy storage subsystems is switched from the first operating mode to the second operating mode, and the operating mode of energy storage subsystems operating in the second operating mode is switched from the second operating mode to the first operating mode. That is, the energy storage subsystems in the energy storage system alternately operate in the first operating mode, so that the operating time of each energy storage subsystem in the first operating mode and the second operating mode can be consistent, thereby improving the consistency of lifespan among the various energy storage subsystems in the energy storage system.

[0062] The energy storage system includes a power conversion system (PCS). As an example, the PCS can send duration information to the control module, which includes the operating duration of each first energy storage subsystem in a first operating mode. Upon receiving this duration information, the control module can obtain the operating duration of each first energy storage subsystem in the first operating mode.

[0063] As another example, the PCS can store the runtime of each first energy storage subsystem in the first operating mode in the cloud, so that the control module can obtain the runtime of each first energy storage subsystem in the first operating mode from the cloud.

[0064] After obtaining the running time of each first energy storage subsystem in the first working mode, the control module can compare the running time of each first energy storage subsystem in the first working mode with the preset running time, and based on the comparison result, switch the first target energy storage subsystem from the first working mode to the second working mode, and switch the second target energy storage subsystem from the second working mode to the first working mode.

[0065] The first target energy storage subsystem can be a first energy storage subsystem with an operating time exceeding a preset operating time, that is, the first target energy storage subsystem is at least a part of the first energy storage subsystems mentioned above.

[0066] Alternatively, the first target energy storage subsystem can also be all the first energy storage subsystems. In other words, if any one of the first energy storage subsystems operates in the first working mode for a duration exceeding a preset duration, then all the first energy storage subsystems can simultaneously switch to the second working mode.

[0067] The first operating mode can be a voltage source operating mode, and the second operating mode can be a current source operating mode. Therefore, the first energy storage subsystem can be an energy storage subsystem operating in voltage source mode, for example, the voltage source energy storage subsystem mentioned above. The second energy storage subsystem can be an energy storage subsystem operating in current source mode, for example, the current source energy storage subsystem mentioned above.

[0068] Optionally, the number of second energy storage subsystems can be greater than the number of first energy storage subsystems.

[0069] Since, under normal circumstances, the number of energy storage subsystems operating in voltage source mode is less than the number operating in current source mode, the above technical solution reduces the computational load and effectively improves switching efficiency by obtaining the operating time of the first energy storage subsystem in voltage source mode and switching the operating mode of the energy storage subsystem when the operating time of some first energy storage subsystems exceeds the preset operating time.

[0070] Of course, embodiments of this application may also obtain the running time of each second energy storage subsystem in the second working mode in at least one second energy storage subsystem, and switch the working mode of the energy storage subsystem after the running time of at least some second energy storage subsystems exceeds the specified running time.

[0071] This application does not specifically limit the preset operating time. For example, the preset operating time can be one month or 20 days. Exemplarily, the preset operating time can be determined based on parameters such as the geographical location of the energy storage system, weather conditions, the historical operating time of the energy storage system, and power generation targets.

[0072] Optionally, the preset runtime can be fixed or it can vary with the parameters.

[0073] Optionally, prior to S210, method 200 may further include: controlling the first energy storage subsystem to operate in a first operating mode, and controlling the second energy storage subsystem to operate in a second operating mode.

[0074] Considering that the PCS has a switching function, in some embodiments, an instruction message can be sent to the PCS to instruct the first target energy storage subsystem to switch its operating mode from a first operating mode to a second operating mode, and the second target energy storage subsystem to switch its operating mode from the second operating mode back to the first operating mode.

[0075] After receiving the instruction, the PCS can switch the operating mode of the first target energy storage subsystem to the second operating mode, and switch the operating mode of the second target energy storage subsystem back to the first operating mode.

[0076] The above technical solution achieves the switching of the working mode of the energy storage subsystem by sending instruction information, which is not only simple to implement but also low in cost.

[0077] Of course, the operating modes of the first target energy storage subsystem and the second target energy storage subsystem can also be switched in other ways in this application embodiment, as long as the switching of operating modes can be achieved.

[0078] In some embodiments, the number of first target energy storage subsystems can be the same as the number of second target energy storage subsystems. That is, if at least some of the first energy storage subsystems operate for more than a preset operating time, an equal number of second target energy storage subsystems can be switched from the second operating mode to the first operating mode.

[0079] In this way, after multiple operating cycles, the duration of each energy storage subsystem operating in the two working modes can be made as consistent as possible, thereby further aligning the lifespans of the various energy storage subsystems.

[0080] As an example, a second target energy storage subsystem can be randomly determined within the second energy storage subsystem.

[0081] As another example, a second target energy storage subsystem can be determined based on the state of charge (SOC) and / or state of health (SOH) of each of the at least one second energy storage subsystem.

[0082] As another example, the second target energy storage subsystem can be determined based on the operating time of each of the at least one second energy storage subsystems in the second operating mode.

[0083] For example, the energy storage subsystem with the longest operating time in the second working mode among at least one second energy storage subsystem can be identified as the second target energy storage subsystem.

[0084] For example, the runtime of each second energy storage subsystem in the second operating mode can be compared with a duration threshold, and at least a portion of the second energy storage subsystems whose runtime exceeds the duration threshold can be identified as the second target energy storage subsystem.

[0085] As another example, method 200 may further include: in at least one second energy storage subsystem, determining a second target energy storage subsystem based on the number of times each second energy storage subsystem operates in the first operating mode.

[0086] Since different operating modes result in different lifespan losses for energy storage subsystems, the above technical solution determines the second target energy storage subsystem based on the number of times each second energy storage subsystem operates in the first operating mode. This ensures that the number of times each energy storage subsystem in the energy storage system operates in the first operating mode is as similar as possible, thereby improving the consistency of lifespan among the various energy storage subsystems in the energy storage system.

[0087] For example, the second energy storage subsystem that operates the most times in the first operating mode can be identified as the second target energy storage subsystem.

[0088] For example, a second energy storage subsystem that operates less than a preset number of times in the first working mode can be identified as the second target energy storage subsystem.

[0089] For example, the N second energy storage subsystems that operate the fewest times in the first operating mode can be identified as the second target energy storage subsystems. Here, N is a positive integer.

[0090] For example, N can be equal to the number of the first target energy storage subsystems. Alternatively, N can be 1. Or, N can be determined based on the actual situation of the energy storage system at the current moment.

[0091] Since different operating modes result in different lifespan losses for energy storage subsystems, the above technical solution identifies the N second energy storage subsystems that operate the fewest times in the first operating mode as the second target energy storage subsystems that need to switch operating modes. In this way, the number of times each energy storage subsystem operates in the first operating mode can be as similar as possible, so that the lifespan of each energy storage subsystem can be made as consistent as possible.

[0092] Alternatively, the second target energy storage subsystem can be determined based on the number of times each second energy storage subsystem operates in the second operating mode. For example, the M second energy storage subsystems that operate the most times in the second operating mode can be identified as the second target energy storage subsystems.

[0093] Considering that even when all operating under the same mode (e.g., in the first operating mode), different operating conditions of the energy storage subsystems can still lead to different State of Charge (SOC), method 200 may further include: adjusting the number of times each energy storage subsystem operates in the first operating mode.

[0094] Even under the same operating mode, different operating conditions of energy storage subsystems can still lead to different State of Charge (SOC). Therefore, the above technical solution adjusts the number of times at least some energy storage subsystems operate in the first operating mode, and in the next cycle, determines the second target energy storage subsystem based on the adjusted number of operations, which can further improve the possibility of lifespan consistency among various energy storage subsystems in the energy storage system.

[0095] Optionally, the number of times each energy storage subsystem operates in the first operating mode can be adjusted during each cycle of major overhaul at the power plant where the energy storage system is located. This cycle can be, for example, one year or other time periods.

[0096] Optionally, the control module can adjust the number of times each energy storage subsystem operates in the first operating mode.

[0097] Alternatively, the number of times each energy storage subsystem operates in the first operating mode can be manually adjusted, and after adjustment, the control module can receive adjustment information input by the user, which includes the adjusted number of times each energy storage subsystem operates in the first operating mode.

[0098] In one possible implementation, the State of Health (SOH) of each first energy storage subsystem in at least one first energy storage subsystem and the State of Health of each second energy storage subsystem in at least one second energy storage subsystem can be obtained, and the number of times each first energy storage subsystem and each second energy storage subsystem operates in the first working mode can be adjusted based on the State of Health of each first energy storage subsystem and the State of Health of each second energy storage subsystem.

[0099] Since the State of Health (SOH) of an energy storage subsystem is closely related to its lifespan, adjusting the number of operations in the first operating mode based on the SOH of the energy storage subsystem can make the lifespan of each energy storage subsystem in the energy storage system as consistent as possible.

[0100] Specifically, the first and second energy storage subsystems with SOH below the SOH threshold can be identified as the subsystems requiring adjustment. Then, if the first rate is greater than the second rate, the number of operations of the energy storage subsystem in the first operating mode can be increased; if the first rate is less than the second rate, the number of operations of the energy storage subsystem in the first operating mode can be decreased. Here, the first rate is the rate at which the SOH of each first energy storage subsystem and each second energy storage subsystem decreases in the first operating mode, and the second rate is the rate at which the SOH of each first energy storage subsystem and each second energy storage subsystem decreases in the second operating mode.

[0101] In other words, the energy storage subsystem is adjusted to a subsystem with a reduced lifespan.

[0102] The SOH threshold can be fixed or updated in real time based on actual conditions; this application does not impose any specific restrictions on this.

[0103] This technical solution adjusts the number of times energy storage subsystems with a SOH below the SOH threshold operate in the first working mode. If the lifespan of an energy storage subsystem is significantly reduced in the first working mode, the number of operations is increased. This results in fewer operations in the next cycle for energy storage subsystems with shorter lifespans in the first working mode, leading to less lifespan loss in the next cycle. Conversely, if the lifespan of an energy storage subsystem is relatively low in the first working mode, the number of operations is decreased. This results in more operations in the next cycle for energy storage subsystems with shorter lifespans in the first working mode, leading to greater lifespan loss in the next cycle. This effectively improves the consistency of lifespan among the various energy storage subsystems in the energy storage system.

[0104] After adjusting the number of operations for each energy storage subsystem in the first operating mode, the control module can store the adjusted number of operations and switch operating modes based on the stored number of operations in the next cycle. For example, in one cycle, the second target energy storage subsystem is determined based on the adjusted number of operations for the second energy storage subsystem in the first operating mode.

[0105] It should be noted that the number of times the first energy storage subsystem and the second energy storage subsystem operate in the second working mode can also be adjusted in the embodiments of this application.

[0106] To determine the number of times each energy storage subsystem operates in the first operating mode, method 200 may further include: recording the number of times each first energy storage subsystem in at least one first energy storage subsystem and each second energy storage subsystem in at least one second energy storage subsystem operates in the first operating mode.

[0107] Specifically, when each energy storage subsystem switches to the first operating mode, the number of times that energy storage subsystem operates in the first operating mode can be incremented by one.

[0108] Record the number of times each energy storage subsystem operates in the first operating mode. This reduces the possibility of incorrect operating mode switching due to incorrect determination of the number of operations, improves the accuracy of switching, and maximizes the consistency of lifespan among the various energy storage subsystems.

[0109] In the embodiments of this application, the order of the above-mentioned process numbers does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0110] Furthermore, without conflict, the various embodiments and / or technical features described in this application can be arbitrarily combined with each other, and the resulting technical solutions should also fall within the protection scope of this application.

[0111] The method for controlling the working mode according to embodiments of this application has been described in detail above. The apparatus for controlling the working mode according to embodiments of this application will now be described. It should be understood that the apparatus for controlling the working mode according to embodiments of this application can execute the method for controlling the working mode according to embodiments of this application.

[0112] Figure 3 A schematic block diagram of an operating mode control device 300 according to an embodiment of this application is shown. This operating mode control device 300 is applied to an energy storage system, which includes at least one first energy storage subsystem and at least one second energy storage subsystem. Figure 3 As shown, the device 300 for controlling this operating mode may include:

[0113] The acquisition unit 310 is used to acquire the runtime of each of the at least one first energy storage subsystems in the first working mode.

[0114] The switching unit 320 is configured to, when the operating time of at least some of the first energy storage subsystems in the at least one first energy storage subsystem exceeds a preset operating time, switch the operating mode of the first target energy storage subsystem in the at least one first energy storage subsystem from the first operating mode to the second operating mode, and switch the second target energy storage subsystem in the at least one second energy storage subsystem from the second operating mode to the first operating mode.

[0115] Optionally, in this embodiment of the application, the number of the first target energy storage subsystems is the same as the number of the second target energy storage subsystems.

[0116] Optionally, in this embodiment of the application, the working mode control device 300 further includes: a determining unit, configured to determine the second target energy storage subsystem in the at least one second energy storage subsystem based on the number of times each second energy storage subsystem operates in the first working mode.

[0117] Optionally, in this embodiment of the application, the determining unit is specifically used to: determine the N second energy storage subsystems that have the fewest runs in the first working mode as the second target energy storage subsystem, where N is a positive integer.

[0118] Optionally, in this embodiment of the application, the working mode control device 300 further includes: an adjustment unit, used to adjust the number of times the at least one first energy storage subsystem and the at least one second energy storage subsystem operate in the first working mode.

[0119] Optionally, in this embodiment of the application, the acquisition unit 310 is further configured to: acquire the SOH of each first energy storage subsystem in the at least one first energy storage subsystem and the SOH of each second energy storage subsystem in the at least one second energy storage subsystem; the adjustment unit is specifically configured to: adjust the number of times the at least one first energy storage subsystem and the at least one second energy storage subsystem operate in the first working mode according to the SOH of each first energy storage subsystem and the SOH of each second energy storage subsystem.

[0120] Optionally, in this embodiment, the adjustment unit is specifically used to: identify the first energy storage subsystem and the second energy storage subsystem whose SOH is lower than the SOH threshold as the adjustment energy storage subsystem; increase the number of times the adjustment energy storage subsystem operates in the first working mode when the first rate is greater than the second rate; and decrease the number of times the adjustment energy storage subsystem operates in the first working mode when the first rate is less than the second rate; wherein, the first rate is the rate at which the SOH of each first energy storage subsystem and the SOH of each second energy storage subsystem decreases in the first working mode, and the second rate is the rate at which the SOH of each first energy storage subsystem and the SOH of each second energy storage subsystem decreases in the second working mode.

[0121] Optionally, in this embodiment of the application, the working mode control device 300 further includes: a recording unit, used to record the number of times each of the at least one first energy storage subsystem and each of the at least one second energy storage subsystem operates in the first working mode.

[0122] Optionally, in this embodiment of the application, the working mode control device 300 further includes: a communication unit, used to send instruction information, the instruction information being used to instruct the working mode of the first target energy storage subsystem to be switched from the first working mode to the second working mode, and the second target energy storage subsystem to be switched from the second working mode to the first working mode.

[0123] Optionally, in this embodiment of the application, the first operating mode is a voltage source mode, and the second operating mode is a current source mode.

[0124] It should be understood that the device 300 controlled by this working mode can perform the corresponding operations in method 200, which will not be elaborated here for the sake of brevity.

[0125] Figure 4 This is a schematic diagram of the hardware structure of the working mode control device 400 according to an embodiment of this application. The working mode control device 400 includes a memory 401, a processor 402, a communication interface 403, and a bus 404. The memory 401, processor 402, and communication interface 403 are interconnected via the bus 404.

[0126] The memory 401 may be a read-only memory (ROM), a static storage device, or a random access memory (RAM). The memory 401 may store a program, and when the program stored in the memory 401 is executed by the processor 402, the processor 402 and the communication interface 403 are used to execute the various steps of the working mode control method of the embodiments of this application.

[0127] The processor 402 may be a general-purpose central processing unit (CPU), microprocessor, application-specific integrated circuit (ASIC), graphics processing unit (GPU), or one or more integrated circuits, used to execute relevant programs to achieve the functions required by the units in the apparatus of this application embodiment, or to execute the working mode control method of this application embodiment.

[0128] The processor 402 can also be an integrated circuit chip with signal processing capabilities. In implementation, each step of the operating mode control method of this embodiment can be accomplished through integrated logic circuits in the processor 402 or through software instructions.

[0129] The processor 402 described above can also be a general-purpose processor, a digital signal processor (DSP), an ASIC, a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of this application. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the methods disclosed in the embodiments of this application can be directly implemented by the hardware processor, or implemented by a combination of hardware and software modules in the processor. The software modules can be located in random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, or other mature storage media in the art. This storage medium is located in memory 401. The processor 402 reads the information in memory 401 and, in conjunction with its hardware, completes the functions required by the units included in the working mode control device 400 of the embodiments of this application, or executes the working mode control method of the embodiments of this application.

[0130] The communication interface 403 uses a transceiver device, such as, but not limited to, a transceiver, to enable communication between the operating mode control device 400 and other devices or communication networks.

[0131] Bus 404 may include a pathway for transmitting information between various components of the operating mode control device 400 (e.g., memory 401, processor 402, communication interface 403).

[0132] It should be noted that although the above-described operating mode control device 400 only shows a memory, processor, and communication interface, those skilled in the art should understand that in specific implementations, the operating mode control device 400 may also include other devices necessary for normal operation. Furthermore, depending on specific needs, those skilled in the art should understand that the operating mode control device 400 may also include hardware devices for implementing other additional functions. Moreover, those skilled in the art should understand that the operating mode control device 400 may only include the devices necessary for implementing the embodiments of this application, and may not necessarily include... Figure 4 All the devices shown.

[0133] This application also provides a computer-readable storage medium for storing a computer program for performing the methods described in the various embodiments of this application.

[0134] The aforementioned computer-readable storage medium may be a transient computer-readable storage medium or a non-transitory computer-readable storage medium.

[0135] This application also provides a computer program product, which includes a computer program stored on a computer-readable storage medium. The computer program includes program instructions that, when executed by a computer, cause the computer to perform the above-described method for controlling the working mode.

[0136] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features. However, these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A method for controlling a working mode, characterized in that, Applied to an energy storage system, the energy storage system comprising at least one first energy storage subsystem and at least one second energy storage subsystem, the method includes: Obtain the runtime of each of the at least one first energy storage subsystems in the first operating mode; If the operating time of at least some of the first energy storage subsystems in the at least one first energy storage subsystem exceeds a preset operating time, the operating mode of the first target energy storage subsystem in the at least one first energy storage subsystem is switched from the first operating mode to the second operating mode, and the operating mode of the second target energy storage subsystem in the at least one second energy storage subsystem is switched from the second operating mode to the first operating mode.

2. The method according to claim 1, characterized in that, The number of the first target energy storage subsystems is the same as the number of the second target energy storage subsystems.

3. The method according to claim 1 or 2, characterized in that, The method further includes: In the at least one second energy storage subsystem, the second target energy storage subsystem is determined based on the number of times each second energy storage subsystem operates in the first operating mode.

4. The method according to claim 3, characterized in that, The step of determining the second target energy storage subsystem based on the number of times each second energy storage subsystem operates in the first operating mode includes: The N second energy storage subsystems that have the fewest runs in the first working mode are identified as the second target energy storage subsystems, where N is a positive integer.

5. The method according to any one of claims 1 to 4, characterized in that, The method further includes: Adjust the number of times the at least one first energy storage subsystem and the at least one second energy storage subsystem operate in the first working mode.

6. The method according to claim 5, characterized in that, Adjusting the number of times the at least one first energy storage subsystem and the at least one second energy storage subsystem operate in the first operating mode includes: Obtain the State of Energy (SOH) of each first energy storage subsystem in the at least one first energy storage subsystem and the State of Energy (SOH) of each second energy storage subsystem in the at least one second energy storage subsystem; Based on the State of Health (SOH) of each first energy storage subsystem and the State of Health (SOH) of each second energy storage subsystem, the number of times the at least one first energy storage subsystem and the at least one second energy storage subsystem operate in the first operating mode is adjusted.

7. The method according to claim 6, characterized in that, The step of adjusting the number of operations of the at least one first energy storage subsystem and the at least one second energy storage subsystem in the first operating mode based on the State of Health (SOH) of each first energy storage subsystem and the State of Health (SOH) of each second energy storage subsystem includes: The first and second energy storage subsystems with SOH below the SOH threshold are identified as adjustment energy storage subsystems. If the first rate is greater than the second rate, the number of times the energy storage subsystem operates in the first working mode is increased. If the first rate is less than the second rate, the number of times the energy storage subsystem operates in the first working mode is reduced. Wherein, the first rate is the rate at which the SOH of each first energy storage subsystem and the SOH of each second energy storage subsystem decrease in the first operating mode, and the second rate is the rate at which the SOH of each first energy storage subsystem and the SOH of each second energy storage subsystem decrease in the second operating mode.

8. The method according to any one of claims 1 to 7, characterized in that, The method further includes: Record the number of times each of the at least one first energy storage subsystems and each of the at least one second energy storage subsystems operates in the first working mode.

9. The method according to any one of claims 1 to 8, characterized in that, The step of switching the operating mode of the first target energy storage subsystem from the first operating mode to the second operating mode, and switching the second target energy storage subsystem in at least one second energy storage subsystem from the second operating mode to the first operating mode, includes: Send instruction information, the instruction information being used to instruct the first target energy storage subsystem to switch its operating mode from the first operating mode to the second operating mode, and the second target energy storage subsystem to switch its operating mode from the second operating mode to the first operating mode.

10. The method according to any one of claims 1 to 9, characterized in that, The first operating mode is voltage source mode, and the second operating mode is current source mode.

11. A device for controlling a working mode, characterized in that, Applied to an energy storage system, the energy storage system comprising at least one first energy storage subsystem and at least one second energy storage subsystem, including: The acquisition unit is used to acquire the runtime of each of the at least one first energy storage subsystems in the first working mode; The switching unit is configured to, when the operating time of at least some of the first energy storage subsystems in the at least one first energy storage subsystem exceeds a preset operating time, switch the operating mode of the first target energy storage subsystem in the at least one first energy storage subsystem from the first operating mode to the second operating mode, and switch the second target energy storage subsystem in the at least one second energy storage subsystem from the second operating mode to the first operating mode.

12. The apparatus according to claim 11, characterized in that, The number of the first target energy storage subsystems is the same as the number of the second target energy storage subsystems.

13. The apparatus according to claim 11 or 12, characterized in that, The device further includes: A determining unit is configured to determine the second target energy storage subsystem based on the number of times each second energy storage subsystem operates in the first operating mode within the at least one second energy storage subsystem.

14. The apparatus according to claim 13, characterized in that, The determining unit is specifically used for: The N second energy storage subsystems that have the fewest runs in the first working mode are identified as the second target energy storage subsystems, where N is a positive integer.

15. The apparatus according to any one of claims 11 to 14, characterized in that, The device further includes: An adjustment unit is used to adjust the number of times the at least one first energy storage subsystem and the at least one second energy storage subsystem operate in the first working mode.

16. The apparatus according to claim 15, characterized in that, The acquisition unit is also used for: Obtain the State of Energy (SOH) of each first energy storage subsystem in the at least one first energy storage subsystem and the State of Energy (SOH) of each second energy storage subsystem in the at least one second energy storage subsystem; The adjustment unit is specifically used for: Based on the State of Health (SOH) of each first energy storage subsystem and the State of Health (SOH) of each second energy storage subsystem, the number of times the at least one first energy storage subsystem and the at least one second energy storage subsystem operate in the first operating mode is adjusted.

17. The apparatus according to claim 16, characterized in that, The adjustment unit is specifically used for: The first and second energy storage subsystems with SOH below the SOH threshold are identified as adjustment energy storage subsystems. If the first rate is greater than the second rate, the number of times the energy storage subsystem operates in the first working mode is increased. If the first rate is less than the second rate, the number of times the energy storage subsystem operates in the first working mode is reduced. Wherein, the first rate is the rate at which the SOH of each first energy storage subsystem and the SOH of each second energy storage subsystem decrease in the first operating mode, and the second rate is the rate at which the SOH of each first energy storage subsystem and the SOH of each second energy storage subsystem decrease in the second operating mode.

18. The apparatus according to any one of claims 1 to 17, characterized in that, The device further includes: A recording unit is used to record the number of times each of the at least one first energy storage subsystems and each of the at least one second energy storage subsystems operates in the first working mode.

19. The apparatus according to any one of claims 11 to 18, characterized in that, The device further includes: A communication unit is used to send instruction information, the instruction information being used to instruct the first target energy storage subsystem to switch its operating mode from the first operating mode to the second operating mode, and the second target energy storage subsystem to switch its operating mode from the second operating mode to the first operating mode.

20. The apparatus according to any one of claims 11 to 19, characterized in that, The first operating mode is voltage source mode, and the second operating mode is current source mode.

21. A device for controlling a working mode, characterized in that, include: Memory, used to store programs; A processor for executing a program stored in the memory, wherein when the program stored in the memory is executed, the processor is configured to perform a method for controlling the operating mode according to any one of claims 1 to 10.

22. A computer-readable storage medium, characterized in that, Used to store a computer program that causes a computer to perform the method of operating mode control as described in any one of claims 1 to 10.

Images