Method and apparatus for controlling energy storage sub-module, and controller, system, medium and product

Abstract

The present application relates to a method and apparatus for controlling an energy storage sub-module, and a controller, a system, a medium and a product. The method comprises: when it is detected that a power module in a target energy storage sub-module has a fault, performing isolation control on the power module and a battery module in the target energy storage sub-module; and when the power module is successfully isolated from the battery module, controlling the target energy storage sub-module to enter a bypass state. By using the present method, the risk of shoot-through of a battery module in an energy storage sub-module can be reduced, thereby improving the reliability of the battery module.

Description

Energy storage submodule control methods, devices, controllers, systems, media and products Cross-references

[0001] This application incorporates Chinese Patent Application No. 202411852947.5, filed on December 13, 2024, entitled “Energy Storage Submodule Control Method, Apparatus, Controller, System, Medium and Product”, which is incorporated herein by reference in its entirety. Technical Field

[0002] This application relates to the field of new energy technology, and in particular to a method, device, controller, system, medium and product for controlling an energy storage submodule. Background Technology

[0003] New energy storage systems have become a research hotspot and have broad application prospects due to their advantages such as being green and pollution-free, low-carbon and environmentally friendly, and renewable.

[0004] Taking a high-voltage direct-connected energy storage system as an example, in some cases, such systems typically include multiple cascaded energy storage submodules. During application, the operation of each submodule can be controlled by adjusting its switching status. In the event of a submodule failure, it is controlled to enter a bypass state to facilitate fault handling.

[0005] However, in some situations, when the energy storage submodule is controlled to enter a bypass state, the battery module in the energy storage submodule may be subject to shoot-through risk, affecting the reliability of the battery module. Summary of the Invention

[0006] Based on this, this application provides a method, apparatus, controller, system, medium, and product for controlling an energy storage submodule, which can improve the reliability of the battery module by reducing the shoot-through risk of the battery module in the energy storage submodule.

[0007] In a first aspect, this application provides a control method for an energy storage submodule, the method comprising: isolating the power module from the battery module in the target energy storage submodule when a power module fault is detected in the target energy storage submodule; and controlling the target energy storage submodule to enter a bypass state when the power module and the battery module are successfully isolated.

[0008] In the technical solution of this application embodiment, the power module and the battery module have been successfully isolated before the target energy storage submodule enters the bypass state. The battery module will not be affected by the control of the energy storage submodule entering the bypass state, which reduces the shoot-through risk of the battery module in the energy storage submodule and improves the reliability of the battery module.

[0009] In some embodiments, isolating the power module from the battery module in the target energy storage submodule includes: sending a disconnection command to an isolation module in the target energy storage submodule, the disconnection command being used to control the isolation module to be in a disconnected state; the isolation module is connected between the power module and the battery module. In the technical solution of this application embodiment, by sending a disconnection command to the isolation module connected between the power module and the battery module, the connection between the power module and the battery module can be effectively isolated, improving the effectiveness of isolating and controlling the battery module.

[0010] In some embodiments, before sending a disconnection command to the isolation module in the target energy storage submodule, the method further includes: sending a fault signal to a control device; the fault signal indicates a fault in the target energy storage submodule; sending a disconnection command to the isolation module in the target energy storage submodule includes: sending a disconnection command to an isolating switch in response to a feedback signal sent by the control device based on the fault signal; the feedback signal indicates that the control device controls the operating current of the battery module to decrease to a preset current range. In the technical solution of this application embodiment, sending a disconnection command to the isolating switch after reducing the operating current of the battery module to a preset current range can reduce the probability of arcing during the disconnection process of the isolating switch, thus improving the reliability of circuit control.

[0011] In some embodiments, sending a disconnection command to the isolation module in the target energy storage submodule includes sending a disconnection command to the circuit breaker. In the technical solutions of this application embodiment, the internal design of the circuit breaker helps to reduce or eliminate the generation of electric arcs when the circuit is disconnected, thus improving the reliability of circuit control.

[0012] In some embodiments, the method further includes: detecting the operating state of the isolation module when a disconnection command is sent to the isolation module; determining that the target energy storage submodule has failed to enter the bypass state when the operating state of the isolation module is closed, and sending a bypass state control failure message to the control device, wherein the bypass state control failure is used by the control device to stop the target energy storage submodule from operating. In the technical solution of this application embodiment, when the isolation module fails to disconnect successfully, resulting in isolation failure between the power module and the battery module, controlling the target energy storage submodule to stop operating can reduce the possibility of battery module failure due to battery module shoot-through, thereby improving the reliability of the battery module.

[0013] In some embodiments, the method further includes: when isolating the power module and the battery module, sending a lockout control command to the power module, the lockout control command being used to control the power module to enter a lockout state. In the technical solution of this application embodiment, by controlling the power module to enter a lockout state, the state of the power module is locked, facilitating fault handling of the power module and improving the convenience of fault maintenance.

[0014] In some embodiments, the power module includes a first power device and a second power device, and the lockout control command includes a first lockout signal and a second lockout signal. Sending the lockout control command to the power module includes: sending a first lockout signal to the first power device and sending a second lockout signal to the second power device; wherein the first lockout signal is used to control the first power device to enter a lockout state, and the second lockout signal is used to control the second power device to enter a lockout state. In the technical solution of this application embodiment, by controlling the first power device and the second power device to enter a lockout state, the first power device and the second power device are locked, which facilitates fault handling of the first power device and the second power device and improves the convenience of fault maintenance.

[0015] In some embodiments, controlling the target energy storage submodule to enter a bypass state includes: sending a closing command to the bypass switch in the target energy storage submodule; the closing command is used to control the bypass switch to be in a closed state, the bypass switch is connected in parallel between the two output terminals of the target energy storage submodule, and the output terminals are used to connect to the power grid system. In the technical solution of this application embodiment, by sending a closing command to the bypass switch, the target energy storage submodule can be effectively bypassed, improving the effectiveness of bypass control of the target energy storage submodule.

[0016] In some embodiments, the method further includes: determining that the target energy storage submodule has successfully entered the bypass state when the bypass switch is detected to have closed successfully, or when the bypass switch is detected to have failed to close successfully and the second power device in the power module connected in parallel with the bypass switch is in a conducting state. In the technical solution of this application embodiment, regardless of whether the target energy storage submodule successfully enters the bypass state by the bypass switch closing successfully or by the second power device being in a conducting state, it can be determined that the target energy storage submodule has successfully entered the bypass state, improving the accuracy and reliability of determining that the target energy storage submodule has successfully entered the bypass state.

[0017] In some embodiments, detecting a power module fault in the target energy storage submodule includes: detecting a short-circuit fault in a first power device and / or a DC support capacitor in the power module; wherein the series circuit of the first power device and the second power device is connected in parallel with the battery module, and the second power device is connected in parallel with the two output terminals of the target energy storage submodule; the DC support capacitor is connected in parallel with the battery module. In the technical solution of this application embodiment, in the event of a short-circuit fault in the first power device and / or the DC support capacitor, the battery module is first isolated and controlled, and then the target energy storage submodule is bypassed. This reduces the occurrence of battery module shoot-through due to short-circuit faults in the first power device and / or the DC support capacitor connected to it, thereby improving the reliability of the battery module.

[0018] In some embodiments, the method further includes: obtaining the bypass state control result of the target energy storage submodule; and reporting the bypass state control result to the control device. In the technical solution of this application embodiment, by reporting the bypass state control result to the control device, the control device can perform corresponding control on the operation of multiple energy storage submodules based on the bypass state control result, thereby improving the reliability of the operation control of multiple energy storage submodules.

[0019] Secondly, this application provides an energy storage submodule control device, which includes: an isolation control module for isolating the power module from the battery module in the target energy storage submodule when a power module fault is detected in the target energy storage submodule; and a bypass control module for controlling the target energy storage submodule to enter a bypass state when the power module and the battery module are successfully isolated.

[0020] Thirdly, this application provides a submodule controller, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the steps of any of the methods described above.

[0021] Fourthly, this application provides an energy storage control system, which includes the aforementioned submodule controller and a control device connected to the submodule controller.

[0022] Fifthly, this application provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of any of the methods described above.

[0023] Sixthly, this application provides a computer program product, including a computer program, which, when executed by a processor, implements the steps of any of the above methods.

[0024] The above description is merely an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are some embodiments of this application. Attached Figure Description

[0025] 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 described 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. In the drawings:

[0026] Figure 1 is a schematic diagram of a new energy storage system provided in some embodiments;

[0027] Figure 2 is a schematic diagram of the structure of a target energy storage submodule provided in some embodiments;

[0028] Figure 3 is a flowchart illustrating a control method for an energy storage submodule provided in the first embodiment;

[0029] Figure 4 is a flowchart illustrating a control method for an energy storage submodule provided in the second embodiment;

[0030] Figure 5 is a flowchart illustrating a control method for an energy storage submodule provided in the third embodiment;

[0031] Figure 6 is a flowchart illustrating a control method for an energy storage submodule provided in the fourth embodiment;

[0032] Figure 7 is a flowchart illustrating the bypass method for the target energy storage submodule provided in the first embodiment;

[0033] Figure 8 is a flowchart illustrating the bypass method for the target energy storage submodule provided in the second embodiment;

[0034] Figure 9 is a schematic diagram of the structure of an energy storage submodule control device provided in some embodiments of this application;

[0035] Figure 10 is a schematic diagram of the structure of an electronic device provided in some embodiments;

[0036] Figure 11 is a schematic diagram of the structure of an energy storage control system provided in some embodiments.

[0037] The reference numerals in the detailed embodiments are as follows:

[0038] Converter 11; New energy submodule 12; Energy storage submodule 121; New energy power generation module 122; Converter 123; Power module 1211; Battery module 1212; Energy storage submodule control device 900; Isolation control module 901; Bypass control module 902. Detailed Implementation

[0039] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein 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 specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0041] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0042] In this document, the term "embodiment" means that a particular 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 separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0043] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0044] Currently, judging from market trends, energy storage systems are being used more and more widely, bringing great convenience to daily production and life. Among various energy storage technologies, high-voltage direct-connected energy storage systems, due to their highly modular structure, can meet the requirements of high efficiency, high reliability, economy, and safety, and are gradually being developed and applied.

[0045] The high-voltage direct-connected energy storage system includes a converter and multiple cascaded energy storage sub-modules connected to the converter. The converter is also connected to the power grid system to enable the power grid system to exchange electrical energy with the battery modules in the energy storage sub-modules.

[0046] In the event of a power module failure in a target energy storage submodule of a multi-cascaded energy storage system, it is necessary to immediately put the target energy storage submodule into bypass mode to ensure the normal operation of the energy storage system. Bypassing the target energy storage submodule facilitates troubleshooting of the power module. However, controlling the target energy storage submodule into bypass mode in the event of a power module failure may lead to battery module failure.

[0047] After consideration, it was found that the target energy storage submodule entering the bypass state would cause changes to the circuit connected to the battery module, which may pose a shoot-through risk to the battery module, thus affecting the reliability of the battery module.

[0048] To alleviate the above problems, research has shown that isolating the battery module before the target energy storage submodule enters the bypass state makes it difficult to affect the battery module even if the circuit connected to the battery module is changed.

[0049] Based on the above considerations, this application provides a control method for an energy storage submodule. When a power module fault is detected in the target energy storage submodule, the power module is isolated from the battery module within the target energy storage submodule. If the isolation between the power module and the battery module is successful, the target energy storage submodule is controlled to enter a bypass state. In this way, successful isolation between the power module and the battery module is achieved before the target energy storage submodule enters the bypass state. Therefore, although controlling the target energy storage submodule to enter the bypass state will cause changes in the circuit parameters within the target energy storage submodule, the battery module in the isolated state will not be affected by these changes. This reduces the shoot-through risk of the battery module in the target energy storage submodule and improves the reliability of the battery module.

[0050] The energy storage submodule control method provided in this application, in the event of a power module failure in the target energy storage submodule, abandons the approach of directly controlling the target energy storage submodule to enter a bypass state. Instead, before controlling the target energy storage submodule to enter the bypass state, it first isolates the power module from the battery module in the target energy storage submodule. This way, even if the circuit state in the target energy storage submodule changes, it will not affect the battery module. In some embodiments, compared to directly controlling the target energy storage submodule to enter a bypass state, although isolating the power module from the battery module in this application results in a time delay in controlling the target energy storage submodule to enter the bypass state, it reduces the risk of battery module shoot-through, thereby improving the reliability of the battery module. Since battery module reliability is a priority, the proposed energy storage submodule control method in this application is highly significant from this perspective.

[0051] The application scenarios of the new energy storage system in this application are not limited to one type. It can be a high-voltage direct-connected energy storage scenario, a medium-high voltage AC cascaded energy storage scenario, a modular multilevel converter (MMC) AC energy storage scenario, or a low-voltage energy storage scenario, etc., and is not limited in this regard. To facilitate understanding of the technical solution of this application, the following example illustrates the application of the new energy storage system in a high-voltage direct-connected energy storage scenario.

[0052] Figure 1 is a schematic diagram of a new energy storage system provided in some embodiments. As shown in Figure 1, the new energy storage system includes a converter device 11 (e.g., a converter or converter station) and multiple cascaded new energy sub-modules 12 (including SM1, SM2, SM3 up to SMN) connected in series with the converter device 11. For example, N is an integer greater than or equal to 3. SM represents a slave module. Each new energy sub-module 12 includes an energy storage sub-module 121, a new energy power generation module 122, and a converter 123. The energy storage sub-module 121 and the new energy power generation module 122 are connected through the converter 123. For example, the converter 123 may include a direct current / direct current (DC / DC) converter or an alternating current / direct current (AC / DC) converter. The energy storage submodule 121 includes a power module 1211 and a battery module 1212. One end of the battery module 1212 is connected to the power module 1211, and the other end of the battery module 1212 is connected to the new energy power generation module 122. The converter device 11 can control the magnitude of the current (also called the system current) flowing through multiple cascaded energy storage submodules 12.

[0053] For example, power module 1211 is a device for power conversion; battery module 1212 is a device for storing and releasing electrical energy; and new energy power generation module 122 is a device capable of generating electricity through new energy technologies. New energy power generation module 122 can charge battery module 1212 of the new energy submodule and can also directly output electrical energy to the power grid system to supply power to the grid system. Power module 1211 can be a half-bridge power module or a full-bridge power module, depending on actual needs; there is no limitation in this regard. Figure 1 illustrates a half-bridge power module structure. Battery module 1212 can be a single battery or a battery pack formed by multiple batteries connected in series and / or in parallel; there is no limitation in this regard. For example, new energy power generation module 122 can include photovoltaic power generation modules, wind power generation modules, hydropower generation modules, tidal power generation modules, or biomass power generation modules, etc.

[0054] In some embodiments, multiple energy storage submodules 12 can be controlled by multiple submodule controllers (not shown in the figure), with a one-to-one correspondence between the multiple energy storage submodules 12 and the multiple submodule controllers. Each submodule controller is connected to a control device (not shown in the figure) to enable communication between the control device and each submodule controller. For example, the control device may be included in the converter 11. In some embodiments, the submodule controller may also include a controller or a submodule control device. In some embodiments, the control device may include a valve control, a valve control system, a valve control device, or any other device capable of controlling the energy storage submodules. In the above embodiments, one submodule controller controls one corresponding energy storage submodule 12. In other embodiments, multiple energy storage submodules 12 and multiple submodule controllers can satisfy a many-to-one correspondence, with one submodule controller controlling multiple corresponding energy storage submodules 12. For example, different submodule controllers control different energy storage submodules 12.

[0055] Figure 2 is a schematic diagram of the structure of an energy storage submodule provided in some embodiments. As shown in Figure 2, in an energy storage submodule, the battery module is connected in series with the power module through an isolation module. The power module includes a first power device (e.g., IGBT1), a second power device (e.g., IGBT1), a DC support capacitor C, and a bypass switch K1. IGBT stands for Insulated Gate Bipolar Transistor. The battery module, switches K2 and K3 in the isolation module, the first power device, and the second power device are connected in series. The battery module, switches K2 and K3 in the isolation module, and the DC support capacitor are connected in series. The DC support capacitor is connected in parallel with the first and second power devices connected in series. The first power device is connected in series with the bypass switch, and the second power device is connected in parallel with the bypass switch. The two ends of the bypass switch are also connected between the two output terminals of the energy storage submodule. The two output terminals of the energy storage submodule are used to connect to the power grid system so that the battery module supplies power to the power grid system through the two output terminals, or so that the power grid system supplies power to the battery module through the two output terminals. The division of the power module in Figure 2 is exemplary. Other division methods exist in other embodiments. For example, in some embodiments other than Figure 2, the power module includes a first power device, a second power device, and a DC support capacitor, but does not include a bypass switch.

[0056] In some embodiments, both the first power device and the second power device are IGBTs. For example, the first power device is a first IGBT, and the second power device is a second IGBT. In other embodiments, both the first power device and the second power device may be metal-oxide-semiconductor field-effect transistors (MOS), bipolar junction transistors (BJTs), or other control switches. This application does not limit these embodiments.

[0057] Taking the control of the power device's opening and closing by the submodule controller as an example, and referring to Figure 2, the working principle of the energy storage submodule exchanging electrical energy with the power grid system is explained as follows: When the battery module in the energy storage submodule needs to exchange electrical energy with the power grid system, the submodule controller corresponding to the energy storage submodule controls the first power device to close and the second power device to open, so that the energy storage submodule can be put into operation and realize the exchange of electrical energy between the power grid system and the battery module in the energy storage submodule. When the battery module in the energy storage submodule does not need to exchange electrical energy with the power grid system, the submodule controller controls the first power device to open and the second power device to close, so that the energy storage submodule is switched out of operation.

[0058] Figure 3 is a flowchart illustrating a control method for an energy storage submodule provided in the first embodiment. This method is applied to a submodule controller, a control device, or an energy storage control system. For example, the energy storage control system may include an integration of the submodule controller and the control device. The method includes:

[0059] S301. If a power module fault is detected in the target energy storage submodule, the power module and the battery module in the target energy storage submodule shall be isolated and controlled.

[0060] In some implementations, the target energy storage submodule can be any one of a plurality of energy storage submodules.

[0061] In some implementations, the state of at least one device in the power module can be detected, and a power module fault in the target energy storage submodule can be determined if one or more of these devices fail. In some implementations, a power module fault may include a short circuit fault, open circuit fault, performance degradation fault, overheating fault, or leakage fault in a device within the power module.

[0062] Isolating the power module and battery module can be implemented in various ways: In some implementations, isolating the power module and battery module can include disconnecting the electrical connection between them, thus electrically isolating them. In other implementations, the battery module is also connected to the output of the target energy storage submodule via a bypass circuit. In this scenario, isolating the power module and battery module can include closing a switch in the bypass circuit, allowing the battery module to bypass the power module and exchange energy with the power grid system through the bypass circuit. In still other implementations, isolating the power module and battery module can include disconnecting the electrical connection between them and closing a switch in the bypass circuit, allowing the battery module to exchange energy with the power grid system through the bypass circuit. In yet another embodiment, isolating the power module and battery module can include disconnecting the electrical connection of the battery module.

[0063] In some implementations, when the power module and battery module are isolated and controlled, it is possible to detect whether the isolation between the power module and battery module is successful.

[0064] S302. When the power module and battery module are successfully isolated, control the target energy storage submodule to enter the bypass state.

[0065] There are several different ways to determine whether the isolation between the power module and the battery module is successful or not:

[0066] For example, when the electrical connection between the power module and the battery module is disconnected, the operating current of the battery module can be detected. If the operating current is 0, it is determined that the power module and the battery module are successfully isolated. If the operating current is not 0, it is determined that the power module and the battery module are not isolated.

[0067] For example, a disconnection command can be sent to the isolation module connected between the power module and the battery module. In response to the disconnection command, the isolation module disconnects the power module from the battery module. If the disconnection is successful, the isolation module sends back a disconnection success indication message, thus the power module and the battery module are successfully isolated. If the disconnection fails, the isolation module sends back a disconnection failure indication message, thus the power module and the battery module are not isolated.

[0068] For example, when the switch in the bypass circuit is closed, or when the electrical connection between the power module and the battery module is disconnected and the switch in the bypass circuit is closed, the operating current of the battery module can be detected. If the operating current is less than or equal to a predetermined current, it is determined that the power module and the battery module are successfully isolated. If the operating current is greater than the predetermined current, it is determined that the power module and the battery module are unsuccessfully isolated.

[0069] There are several ways to control the target energy storage submodule to enter the bypass state: for example, the bypass switch of the target energy storage submodule can be closed to put the target energy storage submodule into the bypass state. Another example is to control the second power device in the target energy storage submodule, which is connected in parallel with the bypass switch, to close to put the target energy storage submodule into the bypass state.

[0070] In some implementations, if the energy storage submodule control method is applied to the submodule controller, in the event of a failure to isolate the power module from the battery module, the energy storage submodule sends a bypass status control failure message to the control device. This bypass status control failure is used by the control device to stop the target energy storage submodule from operating. For example, upon receiving a bypass status control failure message, the control device stops multiple cascaded energy storage submodules from operating.

[0071] In other embodiments, if the energy storage submodule control method is applied to a control device or energy storage control system, in the event that the isolation between the power module and the battery module fails, the control device or energy storage control system controls the target energy storage submodule to stop operating.

[0072] The following examples illustrate how to stop the operation of a target energy storage submodule: For instance, the control device can reduce the operating current (also known as system current) of multiple cascaded energy storage submodules to zero, thereby stopping their operation. Another example is that the control device can control the disconnection of multiple cascaded energy storage submodules. Yet another example is that the control device can control the disconnection of multiple cascaded energy storage submodules through the controllers of each submodule.

[0073] In the technical solution of this application embodiment, the power module and the battery module have been successfully isolated before the target energy storage submodule enters the bypass state. The battery module will not be affected by the control of the energy storage submodule entering the bypass state, which reduces the shoot-through risk of the battery module in the energy storage submodule and improves the reliability of the battery module.

[0074] In some embodiments, isolating the power module from the battery module in the target energy storage submodule includes: sending a disconnection command to the isolation module in the target energy storage submodule, the disconnection command being used to control the isolation module to be in a disconnected state; the isolation module is connected between the power module and the battery module.

[0075] In some implementations, the type of isolation module is determined based on the protection level of the battery module and / or the current scenario type of the target energy storage submodule. For example, when the protection level of the battery module is high, the type of isolation module is a circuit breaker; when the protection level of the battery module is low, the type of isolation module is a disconnecting switch.

[0076] In some implementations, the isolation module includes a switching device comprising two contact connection structures (or sub-switches). One end of the battery module is connected to the power module via one contact connection structure, and the other end of the battery module is connected to the power module via the other contact connection structure. Each contact connection structure includes two contacts that connect the battery module and the power module respectively. When connected, the two contacts in each contact connection structure conduct the connection between the battery module and the power module; when disconnected, the connection between the battery module and the power module is broken. In this case, a disconnection command can be sent to the isolation module to control the separation of the two contacts in each contact connection structure.

[0077] In other embodiments, the isolation module includes two switching devices, each connected to one end of the battery module. One end of the battery module is connected to the power module via one switching device, and the other end is connected to the power module via the other switching device. In this case, a disconnect command can be sent to both switching devices in the isolation module, with each disconnect command controlling the switching devices to be in an disconnected state.

[0078] In some embodiments, the isolation module includes a switching device, through which one end of the battery module is connected to the power module, and the other end of the battery module is connected to the power module. In this case, a disconnect command can be sent to the switching device included in the isolation module to control the switching device to be in an disconnected state.

[0079] In the technical solution of this application embodiment, by sending a disconnection command to the isolation module connected between the power module and the battery module, the connection between the power module and the battery module can be effectively isolated, thereby improving the effectiveness of isolation control of the battery module.

[0080] Figure 4 is a flowchart illustrating a control method for an energy storage submodule provided in the second embodiment. This method is applied to a submodule controller. In the embodiment of Figure 4, the isolation module in the target energy storage submodule is an isolating switch. The method includes:

[0081] S401. If a power module fault is detected in the target energy storage submodule, a fault signal is sent to the control device; the fault signal is used to indicate that the target energy storage submodule is faulty.

[0082] In some implementations, the fault signal can be used to indicate a faulty power device and / or fault type in the power module. In some implementations, the fault signal may also carry a preset current range, instructing the control device to reduce the operating current of the battery module to the preset current range.

[0083] In some implementations, if a power module fault is detected in the target energy storage submodule, the isolation module is determined to be an isolating switch based on the configuration information stored in the submodule controller, and a fault signal is sent to the control device.

[0084] S402. In response to the feedback signal sent by the control equipment based on the fault signal, a disconnection command is sent to the disconnecting switch; the feedback signal is used to indicate that the control equipment controls the operating current of the battery module to be reduced to a preset current range.

[0085] When the control device receives a fault signal, it can send a feedback signal to the submodule controller.

[0086] For example, the preset current range can be the current range that the battery module can withstand during a direct current surge. For example, the minimum value of the preset current range can be 0, and the maximum value can be the preset current. In this way, the control device controls the battery module's operating current (i.e., the system current or the operating current of the energy storage submodule in operation) to decrease from the target current to the preset current range based on the fault signal.

[0087] In some implementations, the feedback signal can carry the reduced operating current of the battery module.

[0088] S403. When the power module and battery module are successfully isolated, control the target energy storage submodule to enter the bypass state.

[0089] In some implementations, successful isolation between the power module and the battery module may include the disconnecting switch between the power module and the battery module being in an open state. Thus, the submodule controller can control the target energy storage submodule to enter a bypass state upon detecting that the disconnecting switch between the power module and the battery module is open.

[0090] In some implementations, if the target energy storage submodule is successfully controlled to enter the bypass state, the submodule controller can send an indication message to the control device indicating that the target energy storage submodule has successfully entered the bypass state. The control device can then restore the system current (also known as the operating current of the energy storage submodule in operation) to the target current based on this indication message.

[0091] The disconnecting switch in this embodiment is a switching device without arc-extinguishing function, used to connect and disconnect low-current circuits. However, the operating current of battery modules in new energy systems is large, often exceeding the current of the circuit that the disconnecting switch can disconnect. Therefore, if the control device controls the disconnecting switch to disconnect a high-current circuit, the arc generated by the disconnecting switch during the disconnection process can lead to circuit disconnection failure. Based on this, this embodiment sends a fault signal to the control device before controlling the disconnecting switch to disconnect the circuit, so that the control device reduces the operating current of the battery module to a preset current range. In this way, the disconnecting switch disconnects a low-current circuit, improving the reliability of the disconnecting switch disconnecting the circuit.

[0092] In the technical solution of this application embodiment, when the operating current of the battery module is reduced to a preset current range, a disconnection command is sent to the disconnecting switch, which can reduce the probability of arcing during the disconnection process. Therefore, this application embodiment can improve the reliability of circuit control.

[0093] In other embodiments, the method is applied to a control device or control system, and the method includes: in the event of a detected power module failure in a target energy storage submodule, controlling the operating current of the battery module to decrease to a preset current range, and sending a disconnection command to an isolating switch.

[0094] Figure 5 is a flowchart illustrating a control method for an energy storage submodule according to a third embodiment. This method is applied to a submodule controller, control equipment, or energy storage control system. In the embodiment shown in Figure 5, the isolation module in the target energy storage submodule is a circuit breaker. The method includes:

[0095] S501. If a power module fault is detected in the target energy storage submodule, a disconnection command is sent to the circuit breaker.

[0096] The circuit breaker in this embodiment is a switching device with arc-extinguishing function. It can quickly extinguish the arc when breaking the circuit, preventing problems such as circuit breaking failure caused by the presence of an arc. Therefore, it can interrupt large currents, which are often greater than or equal to the operating current of the battery module. Thus, the circuit breaker can be directly controlled to break the circuit.

[0097] In some implementations, if a power module failure is detected in the target energy storage submodule, the isolation module is determined to be a circuit breaker based on pre-stored configuration information, and a disconnection command is sent to the circuit breaker.

[0098] S502. When the power module and battery module are successfully isolated, control the target energy storage submodule to enter the bypass state.

[0099] In some embodiments, successful isolation between the power module and the battery module may include the circuit breaker connected between the power module and the battery module being in an open state. This allows the target energy storage submodule to enter a bypass state upon detecting that the circuit breaker connected between the power module and the battery module is in an open state.

[0100] In the technical solution of this application embodiment, when the circuit breaker disconnects the circuit, its internal design helps to reduce or eliminate the generation of electric arc, thus improving the reliability of circuit control.

[0101] When the isolation module in the target energy storage submodule is a circuit breaker, there is no need to change the operating current of the battery module before sending a disconnection command to the circuit breaker. Thus, upon detecting a power module fault in the target energy storage submodule, a disconnection command is sent to the circuit breaker. If the circuit breaker successfully disconnects, the target energy storage submodule is controlled to enter bypass mode. This means the time required to disconnect the circuit breaker is very short (e.g., milliseconds or microseconds), minimizing the impact on the switching operation of the energy storage system. Therefore, even when the circuit breaker is disconnected, the time interval between detecting a power module fault and controlling the bypass state of the target energy storage submodule is very short, enabling timely bypassing of the target energy storage submodule.

[0102] When the isolation module in the target energy storage submodule is a disconnect switch, the operating current of the battery module needs to be reduced before sending a disconnect command to the disconnect switch. Thus, if a power module fault is detected in the target energy storage submodule, the operating current of the battery module is reduced first, and then a disconnect command is sent to the disconnect switch. If the disconnect switch successfully disconnects, the target energy storage submodule is controlled to enter a bypass state. Although the operation of reducing the operating current of the battery module takes a long time, resulting in a longer time interval between detecting a power module fault and controlling the target energy storage submodule to enter the bypass state, this delays the time it takes for the target energy storage submodule to enter the bypass state. However, it improves the reliability of the battery module, which is crucial. Therefore, even if the isolation module is a disconnect switch, the proposed energy storage submodule control method of this application is still of great significance.

[0103] In some embodiments, the embodiments of FIG4 and FIG5 can be used in combination. For example, it can be determined that the isolation module in the target energy storage submodule is a disconnect switch or a circuit breaker. If the isolation module is a disconnect switch, the steps of the embodiment of FIG4 are performed, and if the isolation module is a circuit breaker, the steps of the embodiment of FIG5 are performed.

[0104] The above embodiments illustrate that bypass operation will only be performed when the isolation module connecting the power module and the battery module is successfully disconnected, i.e., the power module and the battery module are successfully isolated. However, if the isolation module connecting the power module and the battery module fails to disconnect, i.e., the power module and the battery module fail to be isolated, the target energy storage submodule cannot be controlled to enter the bypass state, because this would lead to a direct-through risk to the battery module. In this case, it can be determined that the target energy storage submodule has failed to enter the bypass state.

[0105] In some embodiments, the method is applied to a submodule controller, and the method further includes: detecting the operating state of the isolation module when a disconnection command is sent to the isolation module; determining that the target energy storage submodule has failed to enter the bypass state when the operating state of the isolation module is closed, and sending a bypass state control failure to the control device, wherein the bypass state control failure is used by the control device to control the target energy storage submodule to stop operating.

[0106] Thus, if a disconnect command is sent to the isolation module, but the isolation module remains in a closed state, it indicates that the isolation module has failed to disconnect, meaning that the power module and battery module have failed to be isolated.

[0107] In some implementations, if the submodule controller determines that the target energy storage submodule has failed to enter the bypass state, it sends a bypass state control failure message to the control device. Based on the bypass state control failure, the control device stops the target energy storage submodule from operating. For example, based on the bypass state control failure, the control device sets the operating current of the target energy storage submodule to 0, thereby stopping the target energy storage submodule from operating.

[0108] In the technical solution of this application embodiment, when the isolation module fails to disconnect successfully, resulting in the failure of the power module and the battery module to isolate, the target energy storage submodule is controlled to stop operating. This can reduce the possibility of battery module failure due to battery module shoot-through and improve the reliability of the battery module.

[0109] In other embodiments, the method is applied to a control device or control system, and the method further includes: detecting the operating status of the isolation module when a disconnection command is sent to the isolation module; and determining that the target energy storage submodule has failed to enter the bypass state when the operating status of the isolation module is closed, and controlling the target energy storage submodule to stop operating.

[0110] In some embodiments, the method is applied to a submodule controller, a control device, or an energy storage control system. The method further includes: when the power module and the battery module are isolated and controlled, sending a latching control command to the power module, the latching control command being used to control the power module to enter a latching state.

[0111] This application does not limit the order in which the steps of isolating the power module from the battery module in the target energy storage submodule and sending a latching control command to the power module are performed. For example, the steps of isolating the power module from the battery module in the target energy storage submodule and sending a latching control command to the power module can be performed simultaneously. Alternatively, the steps of isolating the power module from the battery module in the target energy storage submodule can be performed first, followed by sending a latching control command to the power module. Yet another example, the steps of sending a latching control command to the power module can be performed first, followed by isolating the power module from the battery module in the target energy storage submodule.

[0112] Entering the lockout state means that the switching state of the power module is locked, which effectively prevents the power module from being damaged due to accidental operation in situations such as equipment failure, maintenance, or failure to meet operating conditions.

[0113] In some implementations, the latching control command is used to control the power module to disconnect before entering the latching state.

[0114] In the technical solution of this application embodiment, by controlling the power module to enter the locked state, the state of the power module is locked, which facilitates fault handling of the power module and improves the convenience of fault maintenance.

[0115] In some embodiments, the power module includes a first power device and a second power device, and the latching control command includes a first latching signal and a second latching signal; the method is applied to a submodule controller, control device, or energy storage control system, and sends a latching control command to the power module, including:

[0116] A first latching signal is sent to a first power device, and a second latching signal is sent to a second power device; wherein the first latching signal is used to control the first power device to enter a latching state, and the second latching signal is used to control the second power device to enter a latching state.

[0117] In some embodiments, a first latching signal is used to control a first power device to disconnect before entering a latching state. In some embodiments, a second latching signal is used to control a second power device to disconnect before entering a latching state.

[0118] In the technical solution of this application embodiment, by controlling the first power device and the second power device to enter the locked state, the first power device and the second power device are locked, which facilitates fault handling of the first power device and the second power device and improves the convenience of fault maintenance.

[0119] The above describes sending a latching control command to the power module, including sending a first latching signal to a first power device and a second latching signal to a second power device. In some other embodiments, sending the latching control command to the power module includes sending a first latching signal to the first power device. In still other embodiments, sending the latching control command to the power module includes sending a second latching signal to the second power device.

[0120] Figure 6 is a flowchart illustrating a control method for an energy storage submodule provided in the fourth embodiment. This method is applied to a submodule controller, control equipment, or energy storage control system, and includes:

[0121] S601. If a power module fault is detected in the target energy storage submodule, the power module and the battery module in the target energy storage submodule shall be isolated and controlled.

[0122] The relevant explanations for S601 can be found in the above explanations for S301, and will not be repeated here.

[0123] S602. If the power module and battery module are successfully isolated, send a closing command to the bypass switch in the target energy storage submodule.

[0124] The closing command is used to control the bypass switch to be in the closed state. The bypass switch is connected in parallel between the two output terminals of the target energy storage submodule, and the output terminals are used to connect to the power grid system.

[0125] In some embodiments, the series circuit of the first power device and the second power device is connected in parallel with the battery module, and the second power device is connected in parallel with the bypass switch.

[0126] In some implementations, the bypass switch may be of the same type as the isolation module. For example, if the isolation module is a disconnect switch, the bypass switch may also be a disconnect switch. Similarly, if the isolation module is a circuit breaker, the bypass switch may also be a circuit breaker. In some implementations, the maximum current value that the bypass switch can withstand may be the same as the maximum current value that the isolation module can withstand, or the difference between the maximum current value that the bypass switch can withstand and the maximum current value that the isolation module can withstand may be less than a preset threshold.

[0127] In the technical solution of this application embodiment, by sending a closing command to the bypass switch, the target energy storage submodule can be effectively bypassed, thereby improving the effectiveness of bypass control of the target energy storage submodule.

[0128] In some embodiments, the method is applied to a submodule controller, control device, or energy storage control system, and the method further includes: determining that the target energy storage submodule has successfully entered the bypass state when the bypass switch is detected to be closed successfully.

[0129] In some embodiments, the method is applied to a submodule controller, control device, or energy storage control system. The method further includes: determining that the target energy storage submodule has successfully entered the bypass state when a bypass switch failure is detected and a second power device connected in parallel with the bypass switch in the power module is in the on state.

[0130] In some implementations, if the bypass switch successfully closes according to the closing command, it provides feedback indicating successful closure. In other implementations, if the bypass switch fails to close according to the closing command, it provides feedback indicating failed closure.

[0131] In some implementations, the current through the bypass switch is detected, and if the current is greater than or equal to a current threshold, the bypass switch is determined to be closed successfully; if the current is equal to 0, the bypass switch is determined to be closed unsuccessfully.

[0132] In some implementations, the current through the second power device is detected, and if the current is greater than or equal to a current threshold, the second power device is determined to be in a conducting state; if the current is equal to 0, the second power device is determined to be in a disconnected state.

[0133] In some implementations, the second power device can be turned on by controlling it to conduct. For example, a closing command can be output to the second power device to cause it to turn on according to the closing command.

[0134] In some implementations, the voltage difference across the bypass switch is detected. This voltage difference is also the voltage difference across the second power device. If the voltage difference is greater than or equal to a voltage threshold, it indicates that the bypass switch has failed to close and the second power device in the power module connected in parallel with the bypass switch is in an open state. If the voltage difference is greater than or equal to the voltage threshold, it indicates that the bypass switch has closed successfully, or that the bypass switch has failed to close and the second power device in the power module connected in parallel with the bypass switch is in a conducting state.

[0135] In some embodiments, if the control of the second power device fails to turn on, the second power device can also be broken down. If the second power device is broken down, it is determined that the target energy storage submodule has successfully entered the bypass state.

[0136] In the technical solution of this application embodiment, whether the target energy storage submodule successfully enters the bypass state by closing the bypass switch or by turning on the second power device, it can be determined that the target energy storage submodule has successfully entered the bypass state, thus improving the accuracy and reliability of determining that the target energy storage submodule has successfully entered the bypass state.

[0137] In some embodiments, the method is applied to a submodule controller, control device, or energy storage control system to detect a power module fault in a target energy storage submodule, including: detecting a short-circuit fault in a first power device in the power module; wherein the series circuit of the first power device and the second power device is connected in parallel with the battery module, and the second power device is connected in parallel with the two output terminals of the target energy storage submodule. Exemplarily, the first power device is the first power device in Figure 2 (e.g., IGBT1).

[0138] In some embodiments, the method is applied to a submodule controller, control device, or energy storage control system to detect a power module fault in a target energy storage submodule, including: detecting a short-circuit fault in the DC support capacitor of the power module; wherein the DC support capacitor is connected in parallel with the battery module.

[0139] In some embodiments, the voltage drop V between the collector C and emitter E of the first power device is determined. CE According to V CE The magnitude of the voltage determines whether the first power device is short-circuited. For example, in V... CE If the voltage value is greater than the preset voltage, the first power device is determined to be short-circuited.

[0140] In the technical solution of this application embodiment, when a short circuit fault occurs in the power device connected to the battery module, the battery module is first isolated and controlled, and then the target energy storage submodule is bypassed and controlled. This reduces the occurrence of battery module shoot-through due to short circuit faults in the power devices connected to it, and improves the reliability of the battery module.

[0141] In some embodiments, the DC support capacitor in the power device is connected in series with the battery module. In the event of a short circuit fault in the DC support capacitor, the power module and the battery module in the target energy storage submodule should also be isolated and controlled. If the power module and the battery module are successfully isolated, the target energy storage submodule is controlled to enter the bypass state.

[0142] In some embodiments, the method is applied to a submodule controller, and the method further includes: obtaining the bypass state control result of the target energy storage submodule; and reporting the bypass state control result to the control device.

[0143] In some implementations, the bypass state control result may include bypass state control success or bypass state control failure.

[0144] If bypass control is successful, the control device can determine the specific energy storage submodule to be put into operation from the unoperated energy storage submodules based on the battery state parameters of the battery module and / or the output capability parameters of the new energy submodule, and control that specific energy storage submodule to be put into operation. In some embodiments, the battery state parameters of the battery module and / or the output capability parameters of the new energy submodule can be sent from the submodule controller to the control device. In some embodiments, the difference between the battery state parameters of the specific energy storage submodule and the battery state parameters of the target energy storage submodule is less than or equal to a state parameter threshold, and / or, the difference between the output capability parameters of the specific energy storage submodule and the output capability parameters of the target energy storage submodule is less than or equal to a capability parameter threshold.

[0145] In the event of bypass status control failure, the bypass status control result sent to the control device is "bypass status control failure". Bypass status control failure is used by the control device to stop the target energy storage submodule from operating.

[0146] In the technical solution of this application embodiment, by reporting the bypass status control result to the control device, the control device can perform corresponding control on the operation of multiple energy storage sub-modules according to the bypass status control result, thereby improving the reliability of the operation control of multiple energy storage sub-modules.

[0147] In some embodiments, a bypass control strategy is provided. This strategy involves the submodule controller, control device, or energy storage control system, upon detecting a short-circuit fault in a first power device, first sending a first blocking signal to the first power device and a second blocking signal to the second power device. Then, it controls the disconnection of an isolating switch or circuit breaker to effectively isolate the battery module from the power module before closing the bypass switch. Thus, this embodiment of the application achieves reliable bypassing of the faulty submodule while reducing the risk of battery shoot-through and improving the reliability of the battery module through the bypass control strategy. In some embodiments, during the bypassing process of the target energy storage submodule, isolation between the battery module and the power module can be achieved, reducing the risk of fault escalation.

[0148] In some embodiments, a high-voltage direct-connected energy storage submodule protection method is provided to prevent short circuits in the battery module. This method is applied to a target energy storage submodule experiencing a power module failure (e.g., a short circuit in the first power device). By controlling the internal switching devices (e.g., isolation modules and bypass switches) of the target energy storage submodule, bypassing the submodule and isolating the power module from the battery module is achieved, and the final bypass result is detected. In a new energy storage system, each energy storage submodule is composed of a power module and a battery module connected in a half-bridge or full-bridge topology. The power module and battery module are connected by switching devices. The power module's topology consists of a first IGBT, a second IGBT, and a DC support capacitor forming a half-bridge circuit, with a bypass switch connected in parallel across the second IGBT.

[0149] In some embodiments, when a power module failure occurs in the target energy storage submodule, requiring bypassing, such as a short-circuit fault in the first power device (e.g., the first IGBT), preventing normal disconnection, closing the bypass switch at this time would cause a short circuit in the battery module, resulting in battery damage or thermal runaway. This application proposes a bypass control strategy to protect the target energy storage submodule against battery short circuits. This bypass strategy involves the submodule controller, control equipment, or energy storage control system sending a latching control command to both the first and second power devices after a power device fault is detected, while simultaneously issuing a disconnection command to the isolation module between the power module and the battery module. If the isolation module is a circuit breaker, the circuit breaker should immediately trip after receiving a tripping command from the submodule controller, control equipment, or energy storage control system. The submodule controller, control equipment, or energy storage control system should then close the bypass switch after confirming the circuit breaker tripping to confirm the final bypass result of the submodule. If the isolation module is a disconnecting switch, the disconnecting switch should wait until the system current is controlled within the preset current range after receiving a tripping command from the submodule controller, control equipment, or energy storage control system before tripping. The submodule controller, control equipment, or energy storage control system should then close the bypass switch after confirming the disconnecting switch tripping to confirm the final bypass result of the submodule.

[0150] The following explanation uses a submodule controller as an example to illustrate the bypass method for the target energy storage submodule:

[0151] Figure 7 is a flowchart illustrating the bypass method for the target energy storage submodule provided in the first embodiment. As shown in Figure 7, the method includes:

[0152] S701, The submodule controller detected a power device failure in the target energy storage submodule.

[0153] For example, a power device failure in the target energy storage submodule may include: a first power device short-circuit failure in the target energy storage submodule.

[0154] S702, the submodule controller sends a fault signal to the control device, the control device reduces the system current and feeds back to the submodule controller.

[0155] S703, the submodule controller sends a disconnection command to the disconnecting switch.

[0156] S704, the submodule controller detects the status of the disconnect switch.

[0157] If the isolating switch is detected to be closed, execute S705; if the isolating switch is detected to be open, execute S706.

[0158] S705, the submodule controller determines that the target energy storage submodule bypass has failed and sends a bypass status control failure message to the control equipment. The control equipment then controls the new energy storage system to stop operating.

[0159] S706, the submodule controller sends a closing command to the bypass switch.

[0160] S707, Submodule Controller detects the status of the bypass switch;

[0161] If the bypass switch is detected to be open, the paper straw is executed in step S708; if the bypass switch is detected to be closed, step S709 is executed.

[0162] S708, the submodule controller detected that the second power device is in the on state.

[0163] S709, Submodule Controller confirms successful bypass of target energy storage submodule.

[0164] Figure 8 is a flowchart illustrating the bypass method for the target energy storage submodule provided in the second embodiment. As shown in Figure 8, the method includes:

[0165] S801, The submodule controller detected a power device failure in the target energy storage submodule.

[0166] S802, the submodule controller sends a disconnection command to the circuit breaker.

[0167] S803, the submodule controller detects the status of the circuit breaker.

[0168] If the circuit breaker is detected to be closed, execute S804; if the circuit breaker is detected to be open, execute S805.

[0169] S804, the submodule controller determines that the target energy storage submodule bypass has failed and sends a bypass status control failure message to the control equipment. The control equipment then controls the new energy storage system to stop operating.

[0170] S805, the submodule controller sends a closing command to the bypass switch.

[0171] S806, Submodule Controller detects the status of the bypass switch;

[0172] If the bypass switch is detected to be open, the paper straw is executed in step S807; if the bypass switch is detected to be closed, step S808 is executed.

[0173] S807, the submodule controller detected that the second power device is in the on state.

[0174] S808, the submodule controller has successfully determined that the target energy storage submodule has been bypassed.

[0175] In some embodiments, switches with different breaking capacities, such as disconnect switches or circuit breakers, can be selected for the isolation module switch, mainly depending on the battery module protection level and the application scenario of the submodule. Because circuit breakers have the ability to interrupt current, in a bypass strategy using a circuit breaker as the switch, the submodule controller can directly control the circuit breaker to disconnect; however, in a scheme using a disconnect switch as the switch, the current needs to be controlled within a preset current range before the disconnect switch can be disconnected. Therefore, in a scheme using a disconnect switch as the switch between the battery module and the power module, the bypass strategy differs from that using a circuit breaker in that the submodule controller needs to add a current reduction step before disconnecting the switch.

[0176] The final bypass status of the target energy storage submodule should be determined by comprehensively considering the results of various bypass measures, and the result of the final bypass status should be sent to the control equipment. If the bypass switch is closed, the target energy storage submodule is considered to have bypassed successfully. Even in a successful bypass state, a disconnector or circuit breaker must be disconnected; if the circuit breaker or disconnector fails to disconnect, the bypass is considered to have failed, and the subsequent bypass switch closing operation will not be performed.

[0177] Based on the same inventive concept, this application also provides an energy storage submodule control device for implementing the energy storage submodule control method described above. The solution provided by this device is similar to the solution described in the above method; therefore, the limitations in the one or more energy storage submodule control device embodiments provided below can be found in the limitations of the energy storage submodule control method described above, and will not be repeated here.

[0178] In one exemplary embodiment, FIG9 is a schematic diagram of the structure of an energy storage submodule control device provided in some embodiments of this application. As shown in FIG9, the energy storage submodule control device 900 includes:

[0179] The isolation control module 901 is used to isolate the power module from the battery module in the target energy storage submodule when a power module fault is detected in the target energy storage submodule.

[0180] The bypass control module 902 is used to control the target energy storage submodule to enter the bypass state when the power module and the battery module are successfully isolated.

[0181] In some embodiments, the isolation control module 901 includes a disconnection control unit, which is used to send a disconnection command to the isolation module in the target energy storage submodule. The disconnection command is used to control the isolation module to be in a disconnected state. The isolation module is connected between the power module and the battery module.

[0182] In some embodiments, the isolation control module 901 includes a fault reporting unit and a disconnection control unit. The fault reporting unit is used to send a fault signal to the control device. The fault signal is used to indicate that the target energy storage submodule is faulty. The disconnection control unit is used to send a disconnection command to the disconnection switch in response to a feedback signal sent by the control device based on the fault signal. The feedback signal is used to indicate that the control device controls the battery module to reduce its operating current to a preset current range.

[0183] In some embodiments, the isolation control module 901 includes a disconnection control unit, which is used to send a disconnection command to the circuit breaker.

[0184] In some embodiments, the isolation control module 901 includes a status detection unit and a bypass status reporting unit. The status detection unit is further configured to detect the operating status of the isolation module when a disconnection command is sent to the isolation module. The bypass status reporting unit is configured to determine that the target energy storage submodule has failed to enter the bypass state when the operating state of the isolation module is closed, and to send a bypass state control failure message to the control device. The bypass state control failure message is used by the control device to control the target energy storage submodule to stop operating.

[0185] In some embodiments, the isolation control module 901 includes a lockout control unit, which is used to send a lockout control command to the power module when the power module and the battery module are isolated and controlled. The lockout control command is used to control the power module to enter a lockout state.

[0186] In some embodiments, the power module includes a first power device and a second power device, and the latching control command includes a first latching signal and a second latching signal; the latching control unit in the isolation control module 901 is used to send a first latching signal to the first power device and a second latching signal to the second power device; wherein, the first latching signal is used to control the first power device to enter a latching state, and the second latching signal is used to control the second power device to enter a latching state.

[0187] In some embodiments, the bypass control module 902 includes a closing control unit, which is used to send a closing command to the bypass switch in the target energy storage submodule; the closing command is used to control the bypass switch to be in a closed state, the bypass switch is connected in parallel between the two output terminals of the target energy storage submodule, and the output terminals are used to connect to the power grid system.

[0188] In some embodiments, the bypass control module 902 includes a bypass state determination unit, which is used to determine that the target energy storage submodule has successfully entered the bypass state when the bypass switch is detected to be closed successfully, or when the bypass switch is detected to be closed unsuccessfully and the second power device in the power module connected in parallel with the bypass switch is in the on state.

[0189] In some embodiments, the isolation control module 901 includes a fault detection unit for detecting short-circuit faults in power devices connected to the battery module in the power module.

[0190] In some embodiments, the bypass control module 902 includes a bypass status reporting unit, which is used to obtain the bypass status control result of the target energy storage submodule and report the bypass status control result to the control device.

[0191] The descriptions of the above device embodiments are similar to those of the above method embodiments, and have similar beneficial effects. For technical details not disclosed in the device embodiments of this application, please refer to the descriptions of the method embodiments of this application for understanding.

[0192] Each module in the aforementioned energy storage submodule control device can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in the processor of the submodule controller in hardware form or independent of it, or stored in the memory of the submodule controller in software form, so that the processor can call and execute the corresponding operations of each module.

[0193] In an exemplary embodiment, Figure 10 is a schematic diagram of the structure of an electronic device provided in some embodiments. The electronic device includes a processor, a memory, an input / output interface, a communication interface, a display unit, and an input device. The processor, memory, and input / output interface are connected via a system bus, and the communication interface, display unit, and input device are also connected to the system bus via the input / output interface. The processor of the electronic device provides computing and control capabilities. The memory of the electronic device includes a non-volatile storage medium and internal memory. The non-volatile storage medium stores an operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage medium. The input / output interface of the electronic device is used for exchanging information between the processor and external devices. The communication interface of the electronic device is used for wired or wireless communication with external terminals. Wireless communication can be achieved through Wireless Fidelity (WIFI), mobile cellular networks, Near Field Communication (NFC), or other technologies. When the computer program is executed by the processor, it implements an energy storage submodule control method. The display unit of the electronic device is used to form a visually visible image and can be a display screen, a projection device, or a virtual reality imaging device. The display screen can be an LCD screen or an e-ink screen. The input device of the electronic device can be a touch layer covering the display screen, or buttons, trackballs, or touchpads set on the casing of the electronic device, or external keyboards, touchpads, or mice, etc.

[0194] Those skilled in the art will understand that the structure shown in Figure 10 is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the electronic device to which the present application is applied. The electronic device may include more or fewer components than shown in the figure, or combine certain components, or have different component arrangements.

[0195] For example, the electronic device can be a submodule controller; for example, the electronic device can be a control device; and for example, the electronic device can be a control system.

[0196] For example, an electronic device includes a memory and a processor, the memory storing a computer program, and the processor executing the computer program to implement the steps of the method of any of the above embodiments.

[0197] For example, in an exemplary embodiment, when the processor executes a computer program, it performs the following: if a power module fault is detected in the target energy storage submodule, it isolates the power module from the battery module in the target energy storage submodule; if the power module and battery module are successfully isolated, it controls the target energy storage submodule to enter a bypass state.

[0198] Figure 11 is a schematic diagram of the structure of an energy storage control system provided in some embodiments. The energy storage control system includes the above-mentioned submodule controller and control equipment connected to the submodule controller.

[0199] In one embodiment, a computer-readable storage medium is provided, wherein a computer program, when executed by a processor, implements the steps of the method provided in any of the above embodiments.

[0200] For example, in one exemplary embodiment, a computer-readable storage medium is provided having a computer program stored thereon, which, when executed by a processor, performs the following steps: when a power module fault is detected in a target energy storage submodule, isolating the power module from the battery module in the target energy storage submodule; and when the power module and battery module are successfully isolated, controlling the target energy storage submodule to enter a bypass state.

[0201] In one embodiment, a computer program product is provided, including a computer program that, when executed by a processor, implements the steps of the method provided in any of the above embodiments.

[0202] For example, in one exemplary embodiment, a computer program product is provided, including a computer program that, when executed by a processor, performs the following steps: in the event of a power module failure detected in a target energy storage submodule, isolating the power module from the battery module in the target energy storage submodule; and, if the power module and battery module are successfully isolated, controlling the target energy storage submodule to enter a bypass state.

[0203] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the methods described above.

[0204] The processor, functional modules, or functional units in any embodiment of this application may include an integration of one or more of the following: a general-purpose processor, an application-specific integrated circuit (ASIC), a digital signal processor (DSP), a digital signal processing device (DSPD), a programmable logic device (PLD), a field-programmable gate array (FPGA), a central processing unit (CPU), a graphics processing unit (GPU), an embedded neural network processing unit (NPU), a controller, a microcontroller, a microprocessor, a programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, a quantum computing-based data processing logic unit, an artificial intelligence (AI) processor, etc. The general-purpose processor may be a microprocessor or any conventional processor.

[0205] The memory or computer-readable storage medium in any embodiment of this application may include at least one of non-volatile memory and volatile memory. Non-volatile memory includes integration of one or more of the following: Read Only Memory (ROM), Programmable Read-Only Memory (PROM), Erasable Programmable Read-Only Memory (EPROM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Ferromagnetic Random Access Memory (FRAM), Flash Memory, Magnetic Surface Memory, Optical Disc, Compact Disc Read-Only Memory (CD-ROM), Magnetic Tape, Floppy Disk, Flash Memory, Optical Memory, High-Density Embedded Non-Volatile Memory, Resistive Random Access Memory (ReRAM), Magnetoresistive Random Access Memory (MRAM), Ferroelectric Random Access Memory (FRAM), and Phase Change Memory. Memory (PCM), graphene memory, volatile memory, etc. Volatile memory includes one or more of the following: Random Access Memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can be in various forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), etc.

[0206] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0207] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A control method for an energy storage submodule, the method comprising: If a power module failure is detected in the target energy storage submodule, the power module and the battery module in the target energy storage submodule are isolated and controlled. If the power module and the battery module are successfully isolated, the target energy storage submodule is controlled to enter the bypass state.

2. The method according to claim 1, wherein, The isolation control of the power module and the battery module in the target energy storage submodule includes: A disconnection command is sent to the isolation module in the target energy storage submodule. The disconnection command is used to control the isolation module to be in a disconnected state. The isolation module is connected between the power module and the battery module.

3. The method according to claim 2, wherein, Before sending a disconnect command to the isolation module in the target energy storage submodule, the method further includes: Send a fault signal to the control device; the fault signal is used to indicate a fault in the target energy storage submodule; Sending a disconnect command to the isolation module in the target energy storage submodule includes: In response to a feedback signal sent by the control device based on the fault signal, the disconnection command is sent to the disconnecting switch; the feedback signal indicates that the control device controls the operating current of the battery module to be reduced to a preset current range.

4. The method according to claim 2 or 3, wherein, Sending a disconnect command to the isolation module in the target energy storage submodule includes: Send the disconnect command to the circuit breaker.

5. The method according to any one of claims 2 to 4, wherein, The method further includes: When the disconnection command is sent to the isolation module, the operating status of the isolation module is detected; When the isolation module is in a closed state, it is determined that the target energy storage submodule has failed to enter the bypass state, and a bypass state control failure is sent to the control device. The bypass state control failure is used by the control device to control the target energy storage submodule to stop operating.

6. The method according to any one of claims 1 to 5, wherein, The method further includes: When the power module and the battery module are isolated and controlled, a lockout control command is sent to the power module, which is used to control the power module to enter a lockout state.

7. The method according to claim 6, wherein, The power module includes a first power device and a second power device, and the lockout control command includes a first lockout signal and a second lockout signal; sending the lockout control command to the power module includes: The first latch signal is sent to the first power device, and the second latch signal is sent to the second power device; wherein the first latch signal is used to control the first power device to enter the latch state, and the second latch signal is used to control the second power device to enter the latch state.

8. The method according to any one of claims 1 to 7, wherein, The control of the target energy storage submodule to enter bypass state includes: A closing command is sent to the bypass switch in the target energy storage submodule; the closing command is used to control the bypass switch to be in a closed state, the bypass switch is connected in parallel between the two output terminals of the target energy storage submodule, and the output terminals are used to connect to the power grid system.

9. The method according to claim 8, wherein, The method further includes: If the bypass switch is detected to be closed successfully, or if the bypass switch is detected to be closed unsuccessfully and the second power device in the power module connected in parallel with the bypass switch is in the on state, the target energy storage submodule is determined to have successfully entered the bypass state.

10. The method according to any one of claims 1 to 9, wherein, The detection of a power module fault in the target energy storage submodule includes: A short-circuit fault was detected in the first power device and / or DC support capacitor in the power module; The series circuit of the first power device and the second power device is connected in parallel with the battery module, and the second power device is connected in parallel with the two output terminals of the target energy storage submodule. The DC support capacitor is connected in parallel with the battery module.

11. The method according to any one of claims 1 to 10, wherein, The method further includes: Obtain the bypass state control result of the target energy storage submodule; The bypass status control result is reported to the control device.

12. A control device for an energy storage submodule, the control device comprising: An isolation control module is used to isolate the power module from the battery module in the target energy storage submodule when a power module failure is detected in the target energy storage submodule. The bypass control module is used to control the target energy storage submodule to enter the bypass state when the power module and the battery module are successfully isolated.

13. A submodule controller, comprising a memory and a processor, the memory storing a computer program, the processor executing the computer program to implement the steps of the method according to any one of claims 1 to 11.

14. An energy storage control system, the energy storage control system comprising the submodule controller of claim 13 and a control device connected to the submodule controller.

15. A computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the method according to any one of claims 1 to 11.

16. A computer program product comprising a computer program that, when executed by a processor, implements the steps of the method according to any one of claims 1 to 11.

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