Energy storage valve submodule, operation method thereof, energy storage valve device and energy storage system

Abstract

The invention relates to an energy storage valve sub-module and an operation method thereof, an energy storage valve device, an energy storage system, a battery bus connecting a battery module and a direct current support capacitor, and a bus power supply module which is further connected to a control module. The load power supply module can take energy from at least one of the DC support capacitor, the battery bus and the battery module, and finally power supply to the control module is realized through the bus power supply module and the load power supply module. Through the scheme, the control module can be switched to supply power through the bus power supply module under the condition that the load power supply module has a power supply fault, or the control module can be switched to supply power through the load power supply module under the condition that the bus power supply module has a power supply fault, namely, redundant power supply of the control module is realized; therefore, the problem that the energy storage system is stopped due to power failure of the control module of the energy storage valve sub-module is solved.

Description

Technical Field

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

[0002] Energy storage provides frequency regulation and peak regulation in all aspects of power generation, transmission, distribution and use, and plays a role in stabilizing the frequency of the power grid, alleviating grid congestion, and improving the flexibility of power generation and use. The cascade energy storage system has the advantages of modular design, high capacity utilization, high conversion efficiency, fast dynamic response, low harmonic content, and stable system operation. It has become a current research hotspot and has broad application prospects.

[0003] The core component of the cascade energy storage system is the energy storage valve submodule that integrates the power module and the battery module. Ensuring the safe and stable operation of the energy storage valve submodule is of great significance to the high reliability of the energy storage system and even the power system. However, the control module in the energy storage valve submodule is prone to power failure, causing the energy storage system to shut down. Summary of the invention

[0004] Based on this, it is necessary to provide an energy storage valve submodule and its operation method, an energy storage valve device, and an energy storage system to alleviate the problem that the control module in the energy storage valve submodule is easily powered off, causing the energy storage system to stop operating.

[0005] The present application provides an energy storage valve submodule, comprising a power module, a battery module, a battery bus, a DC support capacitor, a bus power module, a load power module and a control module, wherein the DC support capacitor is connected in parallel with the power module, and both ends of the DC support capacitor are respectively connected to the battery module through the battery bus; the bus power module is connected to the battery bus; the control module is respectively connected to the bus power module and the load power module, and the control module is also respectively connected to the battery module and the power module, and the load power module draws energy from at least one of the DC support capacitor, the battery bus and the battery module.

[0006] In the above scheme, in the energy storage valve submodule, the battery busbar connecting the battery module and the DC support capacitor is also connected to a bus power module, which is further connected to the control module. The load power module can obtain energy from at least one of the DC support capacitor, the battery busbar and the battery module, and finally the control module is powered by the bus power module and the load power module. Through this scheme, in the event of a power failure in the load power module, the control module can switch to power supply through the bus power module, or in the event of a power failure in the bus power module, switch to power supply through the load power module, that is, to achieve redundant power supply for the control module, thereby alleviating the problem of the energy storage system being shut down due to power failure in the energy storage valve submodule.

[0007] In some embodiments, the energy storage valve submodule also includes a main bus, which is connected to the bus power module. The number of the load power modules includes more than two, at least one of the load power modules draws energy from at least one of the DC support capacitor, the battery bus and the battery module, and at least one of the load power modules draws energy from the main bus.

[0008] In the above scheme, a main bus is further constructed between the bus power module and the control module. The load power module obtains energy from the main bus, so that the bus power module supplies power to the control module, effectively improving the power supply safety and reliability of the control module.

[0009] In some embodiments, the control module includes a power control module, the load power supply module includes a power load power supply module, the power load power supply module and the power module are respectively connected to the power control module, and at least one of the power load power supply modules is connected to the DC support capacitor, and at least one of the power load power supply modules is connected to the main bus.

[0010] The above scheme is used for the power control module for operating the power module, which is connected to more than two power load power supply modules. The power load power supply modules can obtain energy from the DC support capacitor and the main bus to achieve redundant power supply to the power control module and improve the operating reliability of the power control module.

[0011] In some embodiments, the control module also includes a battery control module, and the load power module also includes a battery load power module, the battery load power module is connected to the battery control module, and at least one of the battery load power modules is connected to the battery bus, and at least one of the battery load power modules is connected to the main bus; or, the battery load power modules are all connected to the main bus.

[0012] The above scheme is used to receive the operating status information of different battery modules and send control instructions to the battery module. The battery control module is connected to more than two battery load power modules to achieve redundant power supply to the battery control module and improve the operating reliability of the battery control module.

[0013] In some embodiments, the control module also includes an electrical cabinet control module, and the load power module also includes an electrical cabinet load power module. Each of the battery modules is correspondingly provided with one electrical cabinet control module and more than two electrical cabinet load power modules. Each of the electrical cabinet control modules is respectively connected to the battery module and the battery control module. Each of the electrical cabinet load power modules corresponding to each of the battery modules is respectively connected to the corresponding electrical cabinet control module, and at least one of the electrical cabinet load power modules is connected to the battery module, and at least one of the electrical cabinet load power modules is connected to the main bus.

[0014] The above scheme is used for the electric cabinet control module for operating the battery module, which is connected to more than two electric cabinet load power modules. The electric cabinet load power modules can obtain energy from the battery module and the main bus to achieve redundant power supply to the electric cabinet control module, thereby improving the operating reliability of the electric cabinet control module.

[0015] In some embodiments, the energy storage valve submodule further includes a black start switch, a first end of the black start switch is connected to the battery control module, and a second end of the black start switch is connected to any one of the electrical cabinet load power modules connected to the battery module.

[0016] In the above scheme, a black start switch is provided between the battery control module and the load power module of the electric cabinet. After the energy storage valve submodule stops operating due to a fault or other reasons, energy is taken from the battery module to complete the black start operation, thereby improving the operating reliability of the energy storage valve submodule.

[0017] In some embodiments, the battery module includes a battery, a pre-charging resistor, a pre-charging switch device, a first charging switch device and a second charging switch device, the first end of the battery is connected to the first end of the pre-charging resistor and the first end of the first charging switch device, the second end of the pre-charging resistor is connected to the first end of the pre-charging switch device, the second end of the pre-charging switch device is connected to the second end of the first charging switch device and the battery bus, the second end of the battery is connected to the first end of the second charging switch device, and the second end of the second charging switch device is connected to the battery bus.

[0018] In the above scheme, the battery module is provided with a pre-charging circuit and a charging circuit. During the high-voltage startup process, pre-charging is first achieved through the pre-charging resistor, the pre-charging switch device and the second charging switch device, and then the high-voltage startup is achieved through the first charging switch device and the second charging switch device, thereby improving the safety of high-voltage power-on.

[0019] In some embodiments, the load power module and the bus power module that draw power from the battery bus have a low power consumption operation mode, and / or are connected to the battery bus via a normally closed switch device.

[0020] In the above scheme, the load power supply module and the bus power supply module that draw power from the battery bus are configured with a low-power operation mode, or a normally closed switch device is provided at the previous stage. After the energy storage valve submodule is bypassed, the load power supply module and the bus power supply module that draw power from the battery bus enter the low-power operation mode, or the normally closed switch device is disconnected, thereby alleviating the problem of potential safety hazards to the battery module caused by the adhesion of the first charging switch device and the second charging switch device.

[0021] In some embodiments, the energy storage valve submodule further includes an isolating switch, and the two ends of the DC support capacitor are respectively connected to the battery bus through the isolating switch, and the isolating switch is respectively connected to the main bus and the control module.

[0022] In the above scheme, the battery bus is connected to the DC support capacitor through an isolating switch, so that electrical isolation between the battery bus and the power module can be achieved according to actual operating requirements, thereby improving the operating safety of the energy storage valve submodule.

[0023] In some embodiments, the bus power module includes a first bus power module and a second bus power module, the first bus power module is connected to the battery bus and the main bus respectively, and the second bus power module is connected to the battery bus and the isolating switch respectively.

[0024] In the above scheme, the bus power module includes a first bus power module and a second bus power module, so that the isolating switch can obtain energy from the main bus and the battery bus, realize redundant power supply of the isolating switch, and improve the driving reliability of the isolating switch.

[0025] In some embodiments, the bus power module includes a switching device, an energy storage device and a DC converter, the battery bus is connected to the energy storage device through the switching device, the energy storage device is connected to the DC converter, and the DC converter connects the battery bus and the main bus.

[0026] In the above scheme, at the moment the isolating switch is closed, the power module is connected to the battery bus for rapid discharge, which will cause a sudden drop in the voltage on the input side of the bus power supply. By providing a switching device between the bus power supply module and the battery bus, the switching device can reduce the impact of the instantaneous impact current on the bus power supply module, thereby improving the safety of the bus power supply module.

[0027] In some embodiments, the power module includes a power unit and a bypass switch, the first AC end of the power unit is used to connect the first end of the bypass switch and to be cascaded with other energy storage valve submodules, the second AC end of the power unit is used to connect the second end of the bypass switch and to be cascaded with other energy storage valve submodules, the first DC end and the second DC end of the power unit are respectively connected to the DC support capacitor, and the control end of the power unit is connected to the control module.

[0028] In the above scheme, a bypass switch is provided between the power unit and other energy storage valve submodules to realize bypass operation control of the power module, thereby meeting the bypass operation requirements of the power module and improving the operation reliability of the energy storage valve submodule.

[0029] The present application also provides an operating method based on the above-mentioned energy storage valve submodule, wherein the number of the battery modules includes more than two, and the operating method includes: when the startup conditions are met, controlling any one of the battery modules to conduct the connection with the battery bus to charge the bus power module through the battery bus; when the bus power module completes the establishment of the main bus, conducting the connection between the remaining battery modules and the battery bus.

[0030] In the above scheme, when the energy storage valve submodule meets the start-up conditions, any battery module is first opened to charge the input side of the bus power supply (i.e., the DC support capacitor). After the bus power supply module is charged to establish the main bus, other battery modules are closed for charging. On the one hand, the bus power supply module impact circuit can be reduced to protect the bus power supply module, and on the other hand, the difficulty of selecting related components in the bus power supply module can be reduced.

[0031] In some embodiments, when the bus power module completes the establishment of the main bus, it also includes: taking energy from the main bus to control the power module to perform switching operations; when the voltage of the DC support capacitor is greater than the preset power supply starting voltage, taking energy from the DC support capacitor to control the power module to perform switching operations.

[0032] In the above scheme, when the main bus is established, the power control module can obtain energy from the main bus through the corresponding power load power supply module to realize the switching control of the power module. The switching operation of the power module does not need to wait for the DC support capacitor to be charged to a voltage greater than the preset power supply startup voltage, which effectively improves the response speed of the power module. After the DC support capacitor is charged to a voltage greater than the preset power supply startup voltage, the power control module can also obtain energy from the DC support capacitor to realize redundant power supply and improve the operational reliability of the control module.

[0033] In some embodiments, the operation method further includes: when a power supply failure occurs in a load power supply module currently supplying power, switching to obtain power from another load power supply module with a different power supply mode.

[0034] In the above scheme, when a power supply failure occurs in the current power supply board, power is switched to another load power supply module with a different power supply mode, thereby reducing the risk of power failure of the control module and further improving the operation reliability of the control module.

[0035] In some embodiments, the operating method further includes: when the starting voltage of the bus power module is less than the voltage of the DC support capacitor, and the voltage of the DC support capacitor is less than the voltage of the battery bus, controlling the isolating switch arranged between the battery bus and the DC support capacitor to close.

[0036] In the above scheme, when the starting voltage of the bus power module is lower than the voltage of the DC support capacitor, and the voltage of the DC support capacitor is lower than the voltage of the battery bus, the isolating switch is controlled to close, thereby reducing the risk of instantaneous impact current affecting the safe operation of the bus power module.

[0037] In some embodiments, the operating method also includes: in the event that any one of the battery modules fails, cutting off the failed battery module; switching to obtain power from the load power module connected to the main bus to monitor the battery status information of the failed battery module.

[0038] In the above scheme, when any battery module fails, the battery module is removed and the power is switched to the load power module connected to the main bus, thereby realizing status monitoring of the battery module under fault state and improving the safety of the battery module.

[0039] The present application also provides an energy storage valve device, comprising at least one of the above-mentioned energy storage valve submodules.

[0040] In some examples, the load power supply module of the energy storage valve submodule also obtains energy from at least one of a DC bus and a battery module of an adjacent energy storage valve submodule.

[0041] In the above scheme, multiple energy storage valve sub-modules are arranged in the energy storage valve device. The load power supply module of the current energy storage valve sub-module can also obtain energy from the DC bus or battery module of the adjacent energy storage valve sub-module. Therefore, when the current energy storage valve sub-module fails and stops operating, energy can still be obtained from the adjacent energy storage valve sub-module to power the control module, thereby further improving the power supply reliability of the control module.

[0042] And / or, in some embodiments, the load power supply module of the energy storage valve submodule also draws energy from the main bus of the adjacent energy storage valve submodule.

[0043] In the above scheme, adjacent energy storage valve submodules are also provided with a main bus, and the load power supply module of the current energy storage valve submodule can further obtain energy from the main bus of the adjacent energy storage valve submodule, thereby further improving the power supply reliability of the control module.

[0044] The present application also provides an energy storage system, comprising the above-mentioned energy storage valve device. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0046] Figure 1 This is a schematic diagram of the structure of the energy storage valve submodule in some embodiments of the present application;

[0047] Figure 2 This is a schematic diagram of the structure of the energy storage valve submodule in some other embodiments of the present application;

[0048] Figure 3 This is a schematic diagram of the structure of the energy storage valve submodule in some other embodiments of the present application;

[0049] Figure 4 This is a schematic diagram of the structure of the energy storage valve submodule in some other embodiments of the present application;

[0050] Figure 5 This is a schematic diagram of the structure of the energy storage valve submodule in some other embodiments of the present application;

[0051] Figure 6 This is a schematic diagram of the structure of the energy storage valve submodule in some other embodiments of the present application;

[0052] Figure 7 This is a schematic diagram of the structure of the energy storage valve submodule in some other embodiments of the present application;

[0053] Figure 8 This is a schematic diagram of the structure of the energy storage valve submodule in some other embodiments of the present application;

[0054] Fig. 9 This is a schematic diagram of the structure of a bus power supply module in some embodiments of the present application;

[0055] Fig.10 This is a schematic flow chart of the operation method of the energy storage valve submodule in some embodiments of the present application;

[0056] Fig.11 This is a schematic flow chart of the operation method of the energy storage valve submodule in other embodiments of the present application;

[0057] Fig.12 This is a schematic flow chart of the operation method of the energy storage valve submodule in some embodiments of the present application;

[0058] Fig.13 This is a flow chart of the operation method of the energy storage valve submodule in some further embodiments of the present application. DETAILED DESCRIPTION

[0059] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0060] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0061] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0062] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0063] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0064] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0065] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0066] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0067] At present, from the perspective of the development of the market situation, high-voltage direct-mounted energy storage has gradually been developed and applied because of its highly modular structure and ability to meet the needs of high efficiency, high reliability, economy and safety. In the high-voltage direct-mounted energy storage system, the core part is the energy storage valve submodule. Each energy storage valve submodule includes an integrated power part and an energy storage part. Multiple energy storage valve submodules are connected to form an energy storage system. Typically, energy storage valve submodules are cascaded to form a cascade energy storage system. Therefore, the reliable operation of the energy storage valve submodule directly affects the operation of the energy storage system. How to improve the operational reliability of the energy storage valve submodule is particularly important.

[0068] However, the energy storage valve submodule often loses power during operation. The power failure of any energy storage valve submodule will directly affect the stable operation of the energy storage system, and in severe cases, it will cause the entire energy storage system to shut down. Through research, it is found that the power failure of the energy storage valve submodule is often caused by the power failure of the control module. How to alleviate the power failure of the control module is an effective means to improve the reliability of the energy storage system.

[0069] Based on the above considerations, in order to alleviate the phenomenon of power failure of the control module, two or more load power modules can be set for the control module, and the control module can be redundantly powered by two or more load power modules. In the event of a power failure in the currently powered load power module, other non-failed load power modules can be switched to power the control module, thereby reducing the possibility of power failure in the control module.

[0070] Furthermore, considering that the energy storage valve submodule has a single energy extraction position (generally through the battery bus), if the load power modules are all set to extract energy from the same position, the energy extraction position may fail, resulting in the inability of each load power module to supply power to the control module. In the technical solution of the present application, a bus power module and a main bus are further provided to obtain electric energy through the bus power module, and a main bus is established outside the battery bus to increase the energy extraction points of the load power modules. Each load power module can extract energy from at least one of the battery bus, DC support capacitor, battery module and main bus, thereby enriching the energy extraction position, and multiple load power modules with different energy extraction positions supply power to the control module, further reducing the possibility of power failure in the control module and improving the power supply reliability of the control module.

[0071] By adopting the above scheme, during the operation of the energy storage valve submodule, firstly, any load power module can be used to draw energy from at least one of the battery bus, DC support capacitor, battery module and main bus to supply power to the control module. In the event of a power failure in the load power module currently supplying power, the control module switches to another load power module for power supply. Specifically, the load power module after switching can be at the same energy-drawing position as the load power module with the power failure, or it can be at a different energy-drawing position from the load power module with the power failure, as long as no power failure occurs. This power supply switching method can effectively reduce the possibility of power failure in the control module, that is, reduce the possibility of power failure in the energy storage valve submodule, thereby improving the operating reliability of the energy storage system.

[0072] The energy storage valve submodule provided in the present application is applied in an energy storage system. Specifically, the energy storage valve submodule is applied in an electrochemical energy storage system, that is, an energy storage system that stores, releases and manages energy through batteries. Furthermore, the type of electrochemical energy storage system is not unique, as long as it is an electrochemical energy storage system that needs to be built using an energy storage valve submodule. For example, in a more detailed embodiment, the electrochemical energy storage system includes a high-voltage direct-mounted energy storage system. In order to facilitate understanding of the technical solution of the present application, the following embodiments can all be understood as the energy storage valve submodule being applied in a high-voltage direct-mounted energy storage system.

[0073] See also Figure 1The present application provides an energy storage valve submodule, including a power module 101, a battery module 102, a battery bus 103, a DC support capacitor C, a bus power module 104, a load power module 106 and a control module 107. The DC support capacitor C is connected in parallel with the power module 101, and both ends of the DC support capacitor C are connected to the battery module 102 through the battery bus 103; the bus power module 104 is connected to the battery bus 103; the load power module 106 obtains energy from at least one of the battery bus 103, the DC support capacitor C, and the battery module 102 (not shown in the figure); the control module 107 is connected to the bus power module 104 and the load power module 106 respectively, and the control module 107 is also connected to the battery module 102 and the power module 101 respectively (not shown in the figure).

[0074] Specifically, the power module 101 is a device for connecting an external load to realize power conversion control. The battery module 102 is a device for storing electric energy, and can be charged and discharged through the battery bus 103 under the control of the control module 107. The battery bus 103 is a common electrical channel connected between the battery module 102 and the power module 101, outputting the electric energy of the battery module 102 or inputting electric energy to the battery module 102. The bus power module 104 is a power supply device that takes energy from the battery bus 103, stores and converts it, and realizes power supply.

[0075] The load power supply module 106 is a power supply device that can extract energy from the energy extraction point of the energy storage valve submodule and store it, and convert it into the electric energy required for the load operation. The specific type of the load is not unique, and it can be any load that requires electric energy in the energy storage valve submodule. In more detail, the load can be the control module 107. The form of the load power supply module 106 is also not unique, and it can be a board power supply or other forms of power supply, which are not specifically limited.

[0076] The control module 107 is a device integrated with control components related to the energy storage valve submodule, and is used to control the operation of the power module 101 and the battery module 102. Similarly, the specific form of the control module 107 is not limited, and can be a control device in the form of a board, etc., which is not specifically limited.

[0077] In the solution of this embodiment, the power supply module used to power the control module includes a bus power supply module and a load power supply module, and the bus power supply module obtains energy from the bus, and the load power supply module obtains energy from at least one of the DC support capacitor, the battery bus and the battery module. The bus power supply module and the load power supply module are used to realize redundant power supply of the control module.

[0078] In the above solution, in the energy storage valve submodule, the battery bus 103 connecting the battery module 102 and the DC support capacitor C is also connected to the bus power module 104, and the bus power module 104 is further connected to the control module 107. The load power module 106 can obtain energy from at least one of the DC support capacitor C, the battery bus 104 and the battery module 102, and finally the control module 107 is powered by the bus power module 104 and the load power module 106. Through this solution, in the case of a power failure in the load power module 106, the control module 107 can switch to power supply through the bus power module 104, or in the case of a power failure in the bus power module 104, switch to power supply through the load power module 106, that is, to achieve redundant power supply of the control module 107, thereby alleviating the problem of the energy storage system being shut down due to power failure of the control module 107 in the energy storage valve submodule.

[0079] It should be noted that the bus power module 104 is not the only way to supply power to the control module 107. In one embodiment, the bus power module 104 may be directly connected to the control module 107 for power supply. Figure 2 The energy storage valve submodule also includes a main bus 105, which is connected to the bus power module 104. The number of load power modules 106 includes more than two, and at least one load power module 106 obtains energy from at least one of the DC support capacitor C (not shown), the battery bus 103 and the battery module 102, and at least one load power module 106 obtains energy from the main bus 105.

[0080] Specifically, the main bus 105 is a common electrical channel for outputting the power of the bus power module 104. In the solution of this embodiment, the bus power module 104 supplies power to the control module 107, which is implemented through the main bus 105 and the load power module 106.

[0081] When the energy storage valve submodule meets the startup conditions, the control module 107 will first control any battery module 102 to conduct the connection with the battery bus 103. At this time, the electric energy of the battery module 102 is transmitted to the battery bus 103, and the bus power module 104 obtains electric energy from the battery bus 103 and converts it into electric energy of appropriate size and transmits it to the main bus 105, completing the establishment of the main bus 105. After the main bus 105 is established, the control module 107 will control the remaining battery modules 102 to conduct the connection with the battery bus 103, and quickly charge the DC support capacitor C.

[0082] It is understandable that the specific type of the main bus 105 is not unique, and it can be a DC bus or an AC bus, and the voltage of the main bus 105 is not specifically limited, and can be set in combination with actual needs. For example, in a more detailed embodiment, considering that each control module 107 in the energy storage valve submodule is powered by DC, the main bus 105 is a DC bus, and the voltage output by the main bus 105 is 220V (volts), that is, the main bus 105 is specifically a 220V DC main bus.

[0083] It should be noted that, in one embodiment, the bus power module 104, the main bus 105, the load power module 106 and the control module 107 of the energy storage valve submodule are integrated with the battery module 102 and arranged in the same cabinet to form an electric cabinet. In another embodiment, one or more of the bus power module 104, the main bus 105, the load power module 106 and the control module 107 can also be arranged independently of the battery module 102, which is not specifically limited and can be arranged in combination with the actual line layout.

[0084] It is understandable that the number of load power supply modules 106 is not unique, and two or more may be provided, as long as redundant power supply of the control module 107 can be achieved. And each load power supply module 106 provided may obtain energy from the same position, for example, from the main bus 105; or may obtain energy from different positions, without specific limitation.

[0085] In a more detailed embodiment, the number of load power modules 106 is set to two, and one of the load power modules 106 draws energy from the battery bus 103, that is, the two ends of the load power module 106 are respectively connected to the battery bus 103 and the control module 107; the other load power module 106 draws energy from the main bus 105, and the two ends of the load power module 106 are respectively connected to the main bus 105 and the control module 107.

[0086] It can be understood that in a more detailed embodiment, the battery bus 103 includes a positive terminal battery bus (equivalent to the positive electrode) and a negative terminal battery bus (equivalent to the negative electrode). And / or, the main bus 105 includes a positive terminal main bus (equivalent to the positive electrode) and a negative terminal main bus (equivalent to the negative electrode). Both ends of the positive terminal battery bus and the negative terminal battery bus are respectively connected to the battery module 102 and the power module 101, the positive terminal battery bus and the negative terminal battery bus are both connected to the bus power module 104, and the positive terminal main bus and the negative terminal main bus are both connected to the bus power module 104. When the load power module 106 draws energy from the battery bus 103 or the main bus 105, it is necessary to simultaneously connect the positive and negative ends of the corresponding bus.

[0087] In the above scheme, a main bus 105 is further constructed between the bus power module 104 and the control module 107. The load power module 106 obtains energy from the main bus 105, so that the bus power module 104 supplies power to the control module 107, thereby effectively improving the power supply safety and reliability of the control module 107.

[0088] In the above embodiment, the number of load power modules 106 is set to be multiple, and the bus power module 104 is indirectly connected to the control module through the main bus 105 to realize power supply. In another embodiment, a load power module 106 can also be set in the same energy storage valve submodule, the bus power module 104 is directly connected to the control module 107, and the load power module 106 is simultaneously connected to at least one of the DC support capacitor C, the battery bus 103, the battery module 102 and the main bus 105 to obtain energy, and cooperates with the bus power module 104 to provide redundant power supply for the control module 107.

[0089] Alternatively, the number of load power modules 106 is set to one, and the voltage of the main bus 105 is modulated to be consistent with the voltage required by the control module 107 through the bus power module 104, and the main bus 105 is directly connected to the control module 107. At this time, the load power module 106 is simultaneously connected to at least one of the DC support capacitor C, the battery bus 103, and the battery module 102 to obtain energy, and cooperates with the main bus 105 to provide redundant power supply to the control module 107.

[0090] See also Figure 3 In some embodiments, the control module 107 includes a power control module 201, the load power module 106 includes a power load power module 202, the power load power module 202 and the power module 101 are respectively connected to the power control module 201, and at least one power load power module 202 is connected to the DC support capacitor C, and at least one power load power module 202 is connected to the main bus 105.

[0091] Specifically, the power control module 201 is the control module 107 used to control the operation of the power module 101. The power load power supply module 202 is a device used to supply power to the power control module 201. In the solution of this embodiment, the number of power load power supply modules 202 is redundantly set, and two or more power load power supply modules 202 are used to supply power to the power control module 201. In addition, the energy taking position of the power load power supply module 202 is expanded, and at least one power load power supply module 202 is connected to the DC support capacitor C, and energy is taken from the DC support capacitor C to supply the power control module 201. At least one power load power supply module 202 is connected to the main bus 105, and energy is taken from the main bus 105 and supplied to the power control module 201.

[0092] Figure 3 Taking the number of power load power supply modules 202 as two as an example, correspondingly, one of the power load power supply modules 202 is connected to the DC support capacitor C, and the other power load power supply module 202 is connected to the main bus 105. In the process of supplying power to the power control module 201, if a power supply failure occurs in one of the power load power supply modules 202 (it may be that the power load power supply module 202 fails, or other positions of the power supply line where the power load power supply module 202 is located fail), the power control module 201 can switch to another power load power supply module 202 with a different energy extraction position for power supply, which has higher power supply reliability.

[0093] It should be noted that the control function implemented by the power control module 201 is not unique, and the control function may be different depending on the structure of the actual power module 101. In a more detailed embodiment, the main functions of the power control module 201 include but are not limited to controlling the bypass switch of the power module 101 to close / open, driving the power switch device of the power module 101 to turn on / off, receiving the status information of the bypass switch and the power switch device and transmitting it to the upper-layer server, etc.

[0094] The above scheme is used to control the operation of the power module 101. The power control module 201 is connected to more than two power load power supply modules 202. The power load power supply module 202 can obtain energy from the DC support capacitor C and the main bus 105 to achieve redundant power supply to the power control module 201, thereby improving the operation reliability of the power control module 201.

[0095] See also Figure 4 as well as Figure 5 In some embodiments, the control module 107 also includes a battery control module 301, and the load power module 106 also includes a battery load power module 302, the battery load power module 302 is connected to the battery control module 301, and at least one battery load power module 302 is connected to the battery bus 103, at least one battery load power module 302 is connected to the main bus 105, or all battery load power modules 302 are connected to the main bus 105.

[0096] Specifically, the battery control module 301 is a device for receiving battery status information sent by each battery module 102 and sending operation control signals to each battery module 102. The battery load power supply module 302 is a device for supplying power to the battery control module 301.

[0097] In a solution of an embodiment, the number of battery load power modules 302 is redundantly set, and two or more battery load power modules 302 are used to power the battery control module 301, and the battery load power modules 302 are all connected to the main bus 105 to obtain energy from the main bus 105. In the event of a power supply failure in the current battery load power module 302, another battery load power module 302 is switched to supply power.

[0098] In another embodiment, not only is the number of battery load power modules 302 redundantly set, but also the energy-taking positions of the battery load power modules 302 are expanded, and at least one battery load power module 302 is connected to the battery bus 103, and takes energy from the battery bus 103 to supply the battery control module 301. At least one battery load power module 302 is connected to the main bus 105, and takes energy from the main bus 105 to supply the battery control module 301.

[0099] Figure 5 Taking the number of battery load power modules 302 as two as an example, correspondingly, one of the battery load power modules 302 is connected to the battery bus 103, and the other battery load power module 302 is connected to the main bus 105. During the power supply process of the battery control module 301, if one of the battery load power modules 302 has a power supply failure (it may be that the battery load power module 302 fails, or other positions of the power supply line where the battery load power module 302 is located fail), the battery control module 301 can switch to another battery load power module 302 with a different energy extraction position for power supply, which has higher power supply reliability.

[0100] The above scheme is used to receive the operating status information of different battery modules 102, and the battery control module 301 that issues control instructions to the battery module 102, and is connected to more than two battery load power modules 302 to achieve redundant power supply to the battery control module 301, thereby improving the operating reliability of the battery control module 301.

[0101] See also Figure 6 In some embodiments, the control module 107 also includes an electric cabinet control module 501, and the load power module 106 also includes an electric cabinet load power module 502. Each battery module 102 is correspondingly provided with an electric cabinet control module 501 and more than two electric cabinet load power modules 502. Each electric cabinet control module 501 is respectively connected to the battery module 102 and the battery control module 301. Each electric cabinet load power module 502 corresponding to each battery module 102 is respectively connected to the corresponding electric cabinet control module 501, and at least one electric cabinet load power module 502 is connected to the battery module 102, and at least one electric cabinet load power module 502 is connected to the main bus 105.

[0102] Specifically, in the energy storage valve submodule, multiple battery modules 102 are often arranged, and each battery module 102 includes multiple batteries connected in series and / or parallel. In order to realize independent control of each battery module 102 and independent operation of the battery module 102, in the same energy storage valve submodule, an electrical cabinet control module 501 and more than two electrical cabinet load power supply modules 502 are correspondingly arranged for each battery module 102.

[0103] The electric cabinet control module 501 is a device for controlling the corresponding battery module 102; the electric cabinet load power supply module 502 is a device for supplying power to the electric cabinet control module 501. For each battery module 102, the electric cabinet control module 501 for controlling it is connected to the battery control module 301 of the energy storage valve submodule. The battery status information of each battery module 102 is sent to the battery control module 301 through its corresponding electric cabinet control module 501. The control signal sent by the battery control module 301 is transmitted to the corresponding electric cabinet control module 501, and the electric cabinet control module 501 completes the operation control of the corresponding battery module 102 (for example, the charging and discharging function is turned on, etc.).

[0104] In the solution of this embodiment, the number of cabinet load power modules 502 is redundantly set, and two or more cabinet load power modules 502 are used to power one cabinet control module 501. In addition, the energy taking position of the cabinet load power module 502 is expanded, and at least one cabinet load power module 502 is connected to the battery module 102, and energy is taken from the battery module 102 to supply the power cabinet board. At least one cabinet load power module 502 is connected to the main bus 105, and energy is taken from the main bus 105 and supplied to the cabinet control module 501.

[0105] Taking the number of the electric cabinet load power supply modules 502 as two as an example, correspondingly, one of the electric cabinet load power supply modules 502 is connected to the battery module 102, and the other electric cabinet load power supply module 502 is connected to the main bus 105. During the power supply process of the electric cabinet control module 501, if one of the electric cabinet load power supply modules 502 has a power supply failure (it may be that the electric cabinet load power supply module 502 fails, or other positions of the power supply line where the electric cabinet load power supply module 502 is located fail), the electric cabinet control module 501 can switch to another electric cabinet load power supply module 502 with a different energy extraction position for power supply, which has higher power supply reliability.

[0106] The above scheme is used to control the operation of the battery module 102 through the electric cabinet control module 501, which is connected to more than two electric cabinet load power modules 502. The electric cabinet load power modules 502 can obtain energy from the battery module 102 and the main bus 105 to achieve redundant power supply to the electric cabinet control module 501, thereby improving the operation reliability of the electric cabinet control module 501.

[0107] It should be noted that the specific structures of the power load power supply module 202, the battery load power supply module 302 and the cabinet load power supply module 502 are not unique, and the structures of the load power supply modules 106 can be set the same, or the structures can be set differently, and there is no specific limitation. For example, in a more detailed embodiment, the load power supply modules 106 include at least two parts: an energy storage device and a DC converter, wherein the energy storage device is used to temporarily store the acquired electric energy, and the DC converter is used to convert the electric energy into a voltage suitable for the electric device during the power supply process to achieve reliable power supply.

[0108] See also Figure 7 In some embodiments, the energy storage valve submodule further includes a black start switch K0, a first end of the black start switch K0 is connected to the battery control module 301, and a second end of the black start switch K0 is connected to any one of the electrical cabinet load power modules 502 connected to the battery module 102.

[0109] Specifically, a black start means that after the entire energy storage system stops operating due to a fault, the energy storage system is completely powered off (it does not exclude that isolated small power grids are still in operation), and is in a completely "black" state. It does not rely on the help of other networks. It is started by a device with self-starting capability in the energy storage system, which drives other devices to start, gradually expands the system recovery range, and finally realizes the recovery of the entire system. The black start switch K0 is a switch device used to realize the black start function. During the black start process, by triggering the black start switch K0, the battery control module 301 obtains electrical energy from the battery module 102 of the energy storage system, and then controls each battery module 102 to connect to the energy storage valve submodule, and finally enables the energy storage valve submodule to start and operate, that is, to realize the black start operation of the energy storage system.

[0110] It should be pointed out that, in a more detailed embodiment, in order to facilitate line layout and reduce line costs, the black start switch K0 draws energy from the nearest battery module 102, that is, the second end of the black start switch K0 is connected to the electric cabinet load power supply module 502 connected to the battery module 102, and the electric cabinet load power supply module 502 is closest to the battery control module 301.

[0111] In the above scheme, a black start switch K0 is provided between the battery control module 301 and the electrical cabinet load power supply module 502. After the energy storage valve submodule stops operating due to a fault or other reasons, energy is taken from the battery module 102 to complete the black start operation, thereby improving the operating reliability of the energy storage valve submodule.

[0112] See also Figure 7 In some embodiments, the battery module 102 includes a battery S, a pre-charging resistor R1, a pre-charging switch device K1, a first charging switch device K2 and a second charging switch device K3. The first end of the battery S is connected to the first end of the pre-charging resistor R1 and the first end of the first charging switch device K2. The second end of the pre-charging resistor R1 is connected to the first end of the pre-charging switch device K1. The second end of the pre-charging switch device K1 is connected to the second end of the first charging switch device K2 and the battery bus 103. The second end of the battery S is connected to the first end of the second charging switch device K3, and the second end of the second charging switch device K3 is connected to the battery bus 103.

[0113] Specifically, the battery module 102 includes a normal charge and discharge circuit and a pre-charge circuit. The first end of the battery S is connected to the battery bus 103 through the pre-charge resistor R1 and the pre-charge switch device K1 in sequence. Specifically, it can be connected to the positive electrode or negative electrode of the battery bus 103, that is, it can be connected to the positive end battery bus 103 or the negative end battery bus. The second end of the battery S is connected to the battery bus 103 through the second charge switch device K3, which can also be the positive electrode or negative electrode of the battery bus 103, which can be different from the connection of the first end of the battery S. The first end of the battery module 102 is also connected to the battery bus 103 through the first charge switch device K2, and a pre-charge circuit is formed through the pre-charge resistor R1, the pre-charge switch device K1, the battery bus 103 and the second switch device; a normal charge circuit is formed through the first charge switch device K2, the battery bus 103 and the second charge switch device K3. During operation, the pre-charge circuit is first connected to charge, and then the normal charge circuit is switched on to achieve normal charging and improve operation reliability.

[0114] It should be noted that the above-mentioned pre-charging circuit or normal charging circuit can be that the battery S pre-charges or charges the load, or that the external load pre-charges or charges the battery S, and there is no specific limitation. The battery S in the battery module 102 can be a battery pack formed by connecting single cells in series or in parallel, or a battery device formed by connecting multiple battery packs in series or in parallel, or a single cell, and there is no specific limitation, and it can be set according to actual needs.

[0115] In the above scheme, the battery module 102 is provided with a pre-charging circuit and a charging circuit. During the high-voltage startup process, pre-charging is first achieved through the pre-charging resistor R1, the pre-charging switch device K1 and the second charging switch device K3, and then the high-voltage startup is achieved through the first charging switch device K2 and the second charging switch device K3, thereby improving the safety of high-voltage power-on.

[0116] In some embodiments, the load power module 106 and the bus power module 104 that draw power from the battery bus 103 have a low power consumption operation mode, and / or are connected to the battery bus 103 via a normally closed switch device.

[0117] Specifically, in the solution of this embodiment, the power module 101 of the energy storage valve submodule has a bypass function. After the energy storage valve submodule is bypassed, according to the power-off process of the energy storage system, the control module 107 controls the normal charging circuit of the battery module 102 to be disconnected, that is, the first charging switch device K2 and the second charging switch device K3 are disconnected to alleviate the phenomenon that the load continuously consumes the power of the battery S and causes the over-discharge of the battery S. Specifically, in one embodiment, after the electric cabinet control module 501 receives the information of the battery control module 301, the first charging switch device K2 and the second charging switch device K3 can be controlled to be disconnected.

[0118] However, through research, it is found that in the process of actually disconnecting the first charging switch device K2 and the second charging switch device K3, there is a risk of adhesion between the first charging switch device K2 and the second charging switch device K3, and the battery S cannot be reliably removed, which poses a certain safety hazard.

[0119] The load power supply module 106 that draws power from the battery bus 103 is a load power supply module 106 of the type in which electric energy is transmitted through the battery bus 103. In one embodiment, since the DC support capacitor C is charged and discharged through the battery bus 103, drawing energy from the power module 101 can be equivalent to drawing power from the battery bus 103. Through the arrangement of this embodiment, after the submodule is bypassed, each load power supply module 106 and the bus power supply module 104 that draw power from the battery bus 103 enter a low power consumption mode, and / or the normally closed switch device arranged at the previous stage thereof is disconnected.

[0120] In the above scheme, the load power supply module 106 and the bus battery module 102 that draw power from the battery bus 103 are configured with a low power consumption operation mode, or a normally closed switch device is provided at the previous stage. After the energy storage valve submodule is bypassed, the load power supply module 106 and the bus battery module 102 that draw power from the battery bus 103 enter the low power consumption operation mode, or the normally closed switch device is disconnected, thereby alleviating the problem of potential safety hazards to the battery module 102 due to the adhesion of the first charging switch device K2 and the second charging switch device K3.

[0121] See also Figure 7 In some embodiments, the energy storage valve submodule further includes an isolating switch 108 , and the two ends of the DC support capacitor C are respectively connected to the battery bus 103 through the isolating switch 108 , and the isolating switch 108 is respectively connected to the main bus 105 and the control module 107 .

[0122] Specifically, the isolating switch 108 is a switch device used to achieve electrical isolation of connected modules. In the solution of this embodiment, in order to achieve electrical isolation of the power module 101 and the battery module 102 after the power module 101 is bypassed, an isolating switch 108 is set between the DC support capacitor C and the energy storage module, that is, the battery bus 103 is connected to the DC support capacitor C through the isolating switch 108. In order to achieve on-off control of the isolating switch 108, the isolating switch 108 is also connected to the control module 107. At the same time, in order to realize the power supply of the isolating switch 108, the isolating switch 108 is further connected to the main bus 105.

[0123] In more detail, in one embodiment, the battery bus 103 includes a positive battery bus and a negative battery bus, and the positive battery bus and the negative battery bus are respectively connected to the DC support capacitor C, so the number of isolation switches 108 can be set to two, the positive battery bus is connected to one end of the DC support capacitor C through the first isolation switch 108, and the negative battery bus is connected to the other end of the DC support capacitor C through the second isolation switch 108.

[0124] In the above solution, the battery bus 103 is connected to the DC support capacitor C through the isolation switch 108, so that the electrical isolation between the battery bus 103 and the power module 101 can be achieved according to actual operation requirements, thereby improving the operation safety of the energy storage valve submodule.

[0125] See also Figure 8 In some embodiments, the bus power module 104 includes a first bus power module 701 and a second bus power module 702, the first bus power module 701 is connected to the battery bus 103 and the main bus 105 respectively, and the second bus power module 702 is connected to the battery bus 103 and the isolating switch 108 respectively.

[0126] Specifically, in the solution of this embodiment, the number of bus power modules 104 is two, wherein the first bus power module 701 is connected between the battery bus 103 and the main bus 105 to construct the main bus 105, and the second bus power module 702 is connected between the battery bus 103 and the disconnector 108 to supply power to the disconnector 108 after taking energy from the battery bus 103 and converting it. That is, in the solution of this embodiment, the power supply of the disconnector 108 is redundantly set, and in the event of a failure of the main bus 105, the disconnector 108 can take energy from the second bus power module 702.

[0127] It should be noted that, in one embodiment, to realize redundant power supply of the battery control module 301, at least one battery load power supply module 302 is connected to the second bus power supply module 702, and at least one battery load power supply module 302 is connected to the main bus 105. That is, in the solution of this embodiment, the second bus power supply module 702 can be used not only for redundant power supply of the isolation switch 108, but also for redundant power supply of the battery control module 301. Through the second bus power supply module 702, the electric energy from the battery bus 103 is converted into electric energy of a suitable size (for example, 24V) to power the isolation switch 108 and the battery control module 301.

[0128] In the above scheme, the bus power module 104 includes a first bus power module 701 and a second bus power module 702, so that the isolating switch 108 can obtain energy from the main bus 105 and the battery bus 103, thereby realizing redundant power supply of the isolating switch 108 and improving the driving reliability of the isolating switch 108.

[0129] See also Fig. 9 In some embodiments, the bus power module 104 includes a switching device D1, an energy storage device C1 and a DC converter 801. The battery bus 103 is connected to the energy storage device C1 through the switching device D1. The energy storage device C1 is connected to the DC converter 801. The DC converter 801 connects the battery bus 103 and the main bus 105 (not shown).

[0130] Specifically, C in the figure is a DC support capacitor. When the isolating switch 108 is closed, the DC support capacitor C is connected to the battery bus 103. There is a rapid discharge condition of the energy storage device C1 on the input side of the bus power module 104, which causes a sudden drop in the voltage on the input side of the bus power module 104, and the bus power module 104 cannot work normally. In the scheme of this embodiment, the structure of the bus power module 104 is different from that of other load power modules 106. The DC converter is connected to the battery bus 103 (specifically the negative end battery bus), and is also connected to the main bus 105 to provide power to the main bus 105. A switch device D1 is provided on the input side of the bus power module 104, that is, the energy storage device C1 of the bus power module 104 is connected to the battery bus 103 (specifically the positive end battery bus) through the switch device D1, which prevents the bus power module 104 from discharging to the battery bus 103 when the isolating switch 108 is closed.

[0131] It is understandable that the specific type of the switch device D1 is not unique, and any device can be used as long as it can limit the direction of the flow of electric energy, allowing the battery bus 103 to discharge to the bus power module 104, and preventing the bus power module 104 from discharging to the battery bus 103. For example, in a more detailed embodiment, the switch device D1 includes a diode, the anode of the diode is connected to the battery bus 103, and the cathode of the diode is connected to the energy storage device C1.

[0132] It should be noted that the specific type of the energy storage device C1 is not limited, and any device that can store electrical energy may be used. For example, in a more detailed embodiment, the energy storage device C1 includes a capacitor.

[0133] Further, in a more detailed embodiment, when controlling the isolating dry switch, the following conditions need to be met: the starting voltage of the bus power module 104 is less than the voltage of the DC support capacitor C, and the voltage of the DC support capacitor C is less than the voltage of the battery bus 103. Through this solution, when closing the switch, the voltage of the DC support capacitor C is less than the voltage of the battery bus 103, which can alleviate the situation where the instantaneous impact current threatens the safety of the internal components of the bus power module 104, and effectively improve the safety performance of the bus power module.

[0134] In the above scheme, at the moment when the isolating switch 108 is closed, the DC support capacitor C is connected to the battery bus 103 for rapid discharge, which will cause the voltage on the input side of the bus power supply to drop sharply. By providing a switching device D1 between the bus power supply module 104 and the battery bus 103, the impact of the instantaneous impact current on the bus power supply module 104 is reduced, thereby improving the safety of the bus power supply module 104.

[0135] See also Figure 7 or Figure 8 In some embodiments, the power module 101 includes a power unit 601 and a bypass switch P1, the first AC end of the power unit 601 is used to connect the first end of the bypass switch P1 and to be cascaded with other energy storage valve submodules, the second AC end of the power unit 601 is used to connect the second end of the bypass switch P1 and to be cascaded with other energy storage valve submodules, the first DC end and the second DC end of the power unit 601 are respectively connected to the DC support capacitor C, and the control end of the power unit 601 is connected to the control module 107 (not shown).

[0136] Specifically, the specific structure of the power module 101 is not unique. In the solution of this embodiment, the power module 101 includes a power unit 601 and a bypass switch P1. The DC support capacitor C is used to store electric energy and realizes charging and discharging under the control of the control module 107. The power unit 601 is used for power conversion, and the bypass switch P1 is used to bypass the power unit 601 when there is a bypass demand.

[0137] Further, the power unit 601 may be a full-bridge structure or a half-bridge structure. In a more detailed embodiment, please refer to Figure 7 or Figure 8 Taking a half-bridge structure as an example for explanation, the power unit 601 includes a first power switch T1 and a second power switch T2, the input end of the first power switch T1 is connected to the first end of the DC support capacitor C and the battery bus 103, the second end of the first power switch T1 is connected to the first end of the bypass switch P1 and the input end of the second power switch T2, the output end of the second power switch T2 is connected to the second end of the bypass switch P1 and the second end of the DC support capacitor C, and the control ends of the first power switch T1 and the second power switch T2 are respectively connected to the power control module 201.

[0138] In the above solution, a bypass switch P1 is provided between the power unit 601 and the external circuit to realize bypass operation control of the power module 101, thereby meeting the bypass operation requirement of the power module 101 and improving the operation reliability of the energy storage valve submodule.

[0139] In order to facilitate understanding of the technical solution of the present application, the present application is explained below in conjunction with more detailed embodiments.

[0140] In this embodiment, the energy storage valve submodule includes a power module 101, a battery module 102, a battery bus 103, a bus power module 104, a main bus 105, a load power module 106, a control module 107, a black start switch K0 and an isolating switch 108. Among them, the control module 107 specifically includes a power control module 201, a battery control module 301 and an electric cabinet control module 501, and the load power module 106 specifically includes an electric cabinet load power module 502, a battery load power module 302 and a power load power module 202. Each battery module 102 is correspondingly provided with an electric cabinet control module 501 and two electric cabinet load power modules 502, one of which is connected to the battery module 102, and the other is connected to the main bus 105.

[0141] At least one battery module 102 is arranged in the energy storage valve submodule, and the number of battery load power supply modules 302 and the number of power load power supply modules 202 are respectively two, one of which is connected to the battery bus 103, and the other is connected to the main bus 105; one of which is connected to the power module 101, and the other is connected to the main bus 105.

[0142] Further, the battery module 102 includes a battery, a pre-charging resistor R1, a first charging switch device K2, and a second charging switch device K3, and the power module 101 includes a bypass switch P1 and a power unit 601. The first end of the battery S is connected to the pre-charging resistor R1 and the first charging switch device K2 respectively, the pre-charging resistor R1 is further connected to the battery bus 103 through the pre-charging switch device K1, the first charging switch device K2 is connected to the battery bus 103, and the second end of the battery S is connected to the battery bus 103 through the second charging switch device K3.

[0143] Therefore, during the operation of the energy storage valve submodule, the battery control module 301 first sends a control signal to any battery module 102, so that the pre-charging switch and the second charging switch of the battery module 102 are closed, and the battery in the battery module 102 charges the DC support capacitor C through the battery bus 103. At the same time, the bus power module 104 obtains electric energy through the battery bus 103 and transmits the electric energy to the main bus 105, thereby completing the establishment of the main bus 105.

[0144] After the main bus 105 is successfully established, the battery control module 301 sends a control signal to other electrical cabinet control modules 501, so that other battery modules 102 are connected to the battery bus 103 for operation, and after the pre-start is completed, the first charging switch device K2 and the second charging switch device K3 are switched on to achieve normal charging and discharging operation.

[0145] Moreover, after the main bus 105 is successfully established, the power load power supply module 202 connected to the main bus 105 obtains electric energy from the main bus 105 to supply power to the power control module 201, so that the power control module 201 starts to execute the switching operation of the power module 101, that is, to control the operation of the power module 101. In this process, there is no need to wait for the voltage of the DC support capacitor C to rise. As the voltage of the DC support capacitor C rises, when the voltage of the DC support capacitor C is greater than the preset power supply startup voltage (more specifically, in one embodiment, the preset power supply startup voltage is the startup voltage of the power load power supply module 202 connected to the power module 101), the two power load power supply modules 202 provide redundant power supply for the power control module 201. When a power supply failure occurs in one of them, it can be switched to the other in time to improve the power supply reliability of the important load of the power module 101. After waiting for the voltage output of the energy storage valve submodule to be stable, the electric cabinet control module 501 controls the first charging switch device K2 and the second charging switch device K3 of the corresponding battery module 102 to be disconnected, and the startup of the energy storage valve submodule is completed.

[0146] After that, if one of the battery load power modules 302 fails, another battery load power module 302 with a different energy access position will be switched to power the battery control module 301; if one of the electrical cabinet load power modules 502 fails, another electrical cabinet load power module 502 with a different energy access position will be switched to power the electrical cabinet control module 501.

[0147] In the same energy storage valve submodule, if one of the battery modules 102 fails, the battery control module 301 sends a control signal to the electric cabinet control module 501 corresponding to the battery module 102, thereby controlling the first charging switch device K2 and the second charging switch device K3 of the battery module 102 to be disconnected, and the battery module 102 is removed. Since the battery module 102 is removed, the electric cabinet load power supply module 502 connected to the battery module 102 cannot continue to obtain energy. Therefore, at this time, the electric cabinet control module 501 of the battery module 102 obtains power from the electric cabinet board power supply connected to the main bus 105, monitors the battery module 102, and obtains the battery status information of the battery module 102. Through this solution, when one or more battery modules 102 fail, the failed battery module 102 can be removed to achieve N-1 operation of the energy storage module, that is, when one of the total N energy storage modules fails, the failed energy storage module is removed and continues to operate. It can even achieve N minus multiple fault operation, that is, as long as there are energy storage modules that have not failed, the energy storage valve subsystem can continue to operate.

[0148] Furthermore, when the bypass-related conditions are met, the energy storage submodule controls the bypass switch P1 of the power module 101 to close, and the energy storage submodule enters the bypass operation state. At this time, in order to alleviate the phenomenon that the first charging switch device K2 and the second charging switch device K3 of the energy storage module are stuck together, which brings safety hazards to the battery module 102, the power control module will control the power load power supply module 202 connected to the power module 101 to enter the low power consumption operation mode, and / or control the normally closed switch device set in the front stage of the power load power supply module 202 to be disconnected, so as to improve the operation safety of the power load power supply module 202.

[0149] In the process of bypassing the power module 101, to achieve reliable isolation of the power module 101 and the battery module 102, it is necessary to set an isolating switch 108 between the battery bus 103 and the power module 101, and the isolating switch 108 takes energy from the main bus 105 and / or the battery bus 103. In addition, in order to mitigate the impact of the isolating switch 108 on the bus power module 104 at the moment of closing, a switch device is provided between the energy storage unit of the bus power module 104 and the battery bus 103 to prevent the bus power module 104 from discharging to the battery bus 103. When the isolating switch 108 is closed, the control module 107 (which can be the battery control module 301 or the power control module 201) needs to determine that the starting voltage of the bus power module 104 is less than the voltage of the DC support capacitor C, and the voltage of the DC support capacitor C is less than the voltage of the battery bus 103, and then issue a closing command to improve the operation safety of the bus power module 104.

[0150] If the energy storage submodule (or energy storage system) fails and stops operating, the black start switch K0 can be triggered to enable the battery control module 301 to obtain energy from the electric cabinet load power module 502 connected to the black start switch K0, start working, and gradually restore the operation of the energy storage submodule. More specifically, the black start switch K0 is connected to the electric cabinet power module corresponding to the battery module 102 closest to it, so as to obtain power nearby and reduce line cost and line complexity.

[0151] See also Fig.10 The present application also provides an operating method based on the above-mentioned energy storage valve submodule, the number of battery modules includes more than two, and the operating method includes step 902 and step 904.

[0152] Step 902, when the start-up conditions are met, control any battery module to be connected to the battery bus to charge the bus power module through the battery bus.

[0153] Step 904: When the bus power module completes the establishment of the main bus, the remaining battery modules are connected to the battery bus.

[0154] Specifically, the specific structure and operation principle of the energy storage valve submodule are as shown in the above-mentioned embodiments and drawings, and will not be repeated here. When the energy storage valve submodule meets the startup conditions, the battery control module 301 first sends a control signal to any battery module 102, so that the pre-charge switch and the second charging switch of the battery module 102 are closed, and the battery in the battery module 102 charges the DC support capacitor C through the battery bus 103. At the same time, the bus power module 104 obtains electrical energy through the battery bus 103 and transmits the electrical energy to the main bus 105, thereby completing the establishment of the main bus 105.

[0155] After the main bus 105 is successfully established, the battery control module 301 sends a control signal to other electrical cabinet control modules 501, so that other battery modules 102 are connected to the battery bus 103 for operation, and after the pre-start is completed, the first charging switch device K2 and the second charging switch device K3 are switched on to achieve normal charging and discharging operation.

[0156] In the above scheme, when the energy storage valve submodule meets the start-up conditions, any battery module 102 is first opened to charge the input side of the bus power supply (i.e., the DC support capacitor C), and after the bus power supply module 104 is charged to establish the main bus 105, other battery modules 102 are closed for charging. On the one hand, the bus power supply module 104 can reduce the impact circuit to protect the bus power supply module 104, and on the other hand, it can also reduce the difficulty of selecting related components in the bus power supply module 104.

[0157] In some embodiments, when the bus power module 104 completes the establishment of the main bus 105, it also includes: taking energy from the main bus 105 to control the power module 101 to perform switching operations; when the voltage of the DC support capacitor C is greater than the preset power supply starting voltage, taking energy from the DC support capacitor C to control the power module 101 to perform switching operations.

[0158] Specifically, after the main bus 105 is successfully established, the power load power supply module 202 connected to the main bus 105 obtains electric energy from the main bus 105 to supply power to the power control module 201, so that the power control module 201 starts to execute the switching operation of the power module 101, that is, to control the operation of the power module 101. In this process, there is no need to wait for the voltage of the DC support capacitor C to rise. As the voltage of the DC support capacitor C rises, when the voltage of the DC support capacitor C is greater than the preset power supply startup voltage (more specifically, in one embodiment, the preset power supply startup voltage is the startup voltage of the power load power supply module 202 connected to the power module 101), the two power load power supply modules 202 provide redundant power supply for the power control module 201. When a power supply failure occurs in one of them, it can be switched to the other in time to improve the power supply reliability of the important load of the power module 101. After waiting for the voltage output of the energy storage valve submodule to be stable, the electric cabinet control module 501 controls the first charging switch device K2 and the second charging switch device K3 of the corresponding battery module 102 to be disconnected, and the startup of the energy storage valve submodule is completed.

[0159] In the above scheme, when the main bus 105 is established, the power control module 201 can obtain energy from the main bus 105 through the corresponding power load power supply module 202 to realize the switching control of the power module 101. The switching operation of the power module 101 does not need to wait for the DC support capacitor C to be charged to a voltage greater than the preset power supply startup voltage, which effectively improves the response speed of the power module 101. After the DC support capacitor C is charged to a voltage greater than the preset power supply startup voltage, the power control module 201 can also obtain energy from the DC support capacitor C of the power module 101 to realize redundant power supply and improve the operation reliability of the control module 107.

[0160] See also Fig.11 In some embodiments, the operating method further includes step 110 .

[0161] Step 110: When a power supply failure occurs in a load power supply module currently supplying power, switching to obtain power from another load power supply module with a different power supply mode.

[0162] Specifically, the energy acquisition method is the method of obtaining electric energy. In more detail, in the technical solution of the present application, the energy acquisition method includes the energy acquisition location point. Different energy acquisition location points represent different energy acquisition methods. The power control module 201, the battery control module 301 and the electric cabinet control module 501 can all realize redundant power supply. When a power supply failure occurs in the power load power supply module 202 that currently supplies power to the power control module 201, the power load power supply module 202 triggers undervoltage protection and stops working. The power control module 201 can switch to another power load power supply module 202 with a different energy acquisition method to obtain energy. For example, when a power supply failure occurs in the power load power supply module 202 connected to the power module 101 (which may be a failure caused by a short circuit of the battery bus 103, etc.), it switches to the power load power supply module 202 connected to the main bus 105 for power supply.

[0163] When a power supply failure occurs in the battery load power supply module 302 currently supplying power to the battery control module 301, the battery control module 301 can switch to obtain power from another battery load power supply module 302 with a different energy obtaining mode. For example, when a power supply failure occurs in the battery load power supply module 302 connected to the battery bus 103, the battery load power supply module 302 connected to the main bus 105 is switched to supply power.

[0164] When a power failure occurs in the electric cabinet load power supply module 502 currently supplying power to the electric cabinet control module 501, the electric cabinet control module 501 can switch to obtain power from another electric cabinet load power supply module 502 with a different energy obtaining mode. For example, when a power failure occurs in the electric cabinet load power supply module 502 connected to the battery module 102, the electric cabinet load power supply module 502 connected to the main bus 105 is switched to supply power.

[0165] In the above scheme, when a power supply failure occurs in the current power supply board, power is switched to another load power supply module 106 with a different power supply mode, thereby reducing the risk of power failure of the control module 107 and further improving the operating reliability of the control module 107.

[0166] See also Fig.12 In some embodiments, the operating method further includes step 122 .

[0167] Step 122, when the starting voltage of the bus power module is less than the voltage of the DC support capacitor, and the voltage of the DC support capacitor is less than the voltage of the battery bus, control the isolation switch disposed between the battery bus and the DC support capacitor to close.

[0168] Specifically, at the moment when the isolating switch 108 is closed, if the voltage of the DC support capacitor C is greater than or equal to the voltage of the battery bus 103, due to the extremely low circuit damping between the two, the instantaneous impact current brought about will threaten the safety of the internal components of the bus power module 104. Therefore, the scheme of this embodiment needs to meet the following conditions when controlling the closing of the isolating switch: the starting voltage of the bus power module 104 is less than the voltage of the DC support capacitor C, and the voltage of the DC support capacitor C is less than the voltage of the battery bus 103. Thus, at the moment of closing, the situation where the instantaneous impact current impacts the bus power module 104 is effectively alleviated, and the component safety of the bus power module 104 is improved.

[0169] In the above scheme, when the starting voltage of the bus power module 104 is lower than the voltage of the DC support capacitor C, and the voltage of the DC support capacitor C is lower than the voltage of the battery bus 103, the isolating switch 108 is controlled to close, thereby reducing the risk of instantaneous impact current affecting the safe operation of the bus power module 104.

[0170] See also Fig.13 In some embodiments, the operating method further includes step 132 and step 134.

[0171] Step 132: When any battery module fails, the failed battery module is removed.

[0172] Step 134 , switching to obtain power from a load power module connected to the main bus to monitor the battery status information of the failed battery module.

[0173] Specifically, in the same energy storage valve submodule, if one of the battery modules 102 fails, the battery control module 301 sends a control signal to the electric cabinet control module 501 corresponding to the battery module 102, thereby controlling the first charging switch device K2 and the second charging switch device K3 of the battery module 102 to be disconnected, and the battery module 102 is removed. Since the battery module 102 is removed, the electric cabinet load power supply module 502 connected to the battery module 102 cannot continue to obtain energy, so at this time, the electric cabinet control module 501 of the battery module 102 obtains power from the electric cabinet board power supply connected to the main bus 105, monitors the battery module 102, and obtains the battery status information of the battery module 102.

[0174] In the above scheme, when any battery module 102 fails, the battery module 102 is removed and the power is switched to the load power module 106 connected to the main bus 105, so as to realize status monitoring of the battery module 102 under the fault state and improve the safety of the battery module 102.

[0175] The present application also provides an energy storage valve device, comprising at least one of the above-mentioned energy storage valve submodules.

[0176] Specifically, the structure and operation method of the energy storage valve submodule are as shown in the above-mentioned embodiments and the accompanying drawings, and will not be repeated here. In the energy storage valve device, each energy storage valve submodule is cascaded to form a cascaded energy storage valve device. In the same energy storage valve submodule of the cascaded energy storage valve device, the battery bus connecting the battery module and the DC support capacitor is also connected to a bus power module, and the bus power module is further connected to the control module. The load power module can take energy from at least one of the DC support capacitor, the battery bus and the battery module, and finally realize redundant power supply to the control module 107 through the bus power module and the load power module.

[0177] Through this solution, in the event of a power failure in the load power module, the control module can switch to power supply through the bus power module, or in the event of a power failure in the bus power module, switch to power supply through the load power module, that is, to achieve redundant power supply for the control module, thereby alleviating the problem of energy storage system shutdown caused by power failure of the control module due to the energy storage valve submodule.

[0178] In some examples, the load power supply module of the energy storage valve submodule also obtains energy from at least one of a DC bus and a battery module of an adjacent energy storage valve submodule.

[0179] Specifically, the structure of the adjacent energy storage valve submodule may be consistent with the structure of the energy storage valve submodule provided in the above embodiment, or may be inconsistent with the structure of the above energy storage valve submodule, and is not specifically limited, and can be selected in combination with actual needs. In the above scheme, multiple energy storage valve submodules are arranged in the energy storage valve device, and the load power supply module of the current energy storage valve submodule can also obtain energy from the DC bus or battery module of the adjacent energy storage valve submodule, so that when the current energy storage valve submodule fails and stops operating, it can still obtain energy from the adjacent energy storage valve submodule to power the control module, further improving the power supply reliability of the control module.

[0180] And / or, in some embodiments, the load power supply module of the energy storage valve submodule also draws energy from the main bus of the adjacent energy storage valve submodule.

[0181] Specifically, in the solution of this embodiment, adjacent energy storage valve submodules are further constructed with a main busbar in addition to the battery busbar. The construction method of the main busbar is consistent with the construction method of the main busbar of the energy storage valve submodule in the above embodiment, which will not be repeated here.

[0182] In the above scheme, adjacent energy storage valve submodules are also provided with a main bus, and the load power supply module of the current energy storage valve submodule can further obtain energy from the main bus of the adjacent energy storage valve submodule, thereby further improving the power supply reliability of the control module.

[0183] The present application also provides an energy storage system, comprising the above-mentioned energy storage valve device.

[0184] Specifically, the structure and operating principle of the energy storage valve device are as shown in the above-mentioned embodiments and the accompanying drawings, and will not be repeated here. In the energy storage system, each energy storage valve submodule is cascaded to form a cascaded energy storage valve device. In the cascaded energy storage valve device, the battery bus 103 connecting the battery module 102 and the DC support capacitor C is also connected to the bus power module 104, and the bus power module 104 is further connected to the control module 107. The load power module 106 can take energy from at least one of the DC support capacitor C, the battery bus 104 and the battery module 102, and finally the control module 107 is powered by the bus power module 104 and the load power module 106. Through this solution, in the event of a power failure in the load power module 106, the control module 107 can switch to power supply through the bus power module 104, or in the event of a power failure in the bus power module 104, switch to power supply through the load power module 106, that is, to achieve redundant power supply for the control module 107, thereby alleviating the problem of the energy storage system being shut down due to power failure of the control module 107 due to the energy storage valve submodule.

[0185] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A storage valve submodule, characterized in that: include: Power module; Battery modules; Battery busbar; A DC support capacitor, wherein the DC support capacitor is connected in parallel with the power module, and both ends of the DC support capacitor are connected to the battery module through the battery bus bar; A bus power module, the bus power module is connected to the battery bus; A load power supply module, wherein the load power supply module obtains energy from at least one of the DC support capacitor, the battery bus and the battery module; A control module, wherein the control module is connected to the bus power module and the load power module respectively, and the control module is also connected to the battery module and the power module respectively.

2. The energy storage valve submodule according to claim 1, characterized in that: It also includes a main bus, which is connected to the bus power module. The number of the load power modules includes more than two, at least one of the load power modules obtains energy from at least one of the DC support capacitor, the battery bus and the battery module, and at least one of the load power modules obtains energy from the main bus.

3. The energy storage valve submodule according to claim 2, characterized in that: The control module includes a power control module, and the load power supply module includes a power load power supply module. The power load power supply module and the power module are respectively connected to the power control module, and at least one of the power load power supply modules is connected to the DC support capacitor, and at least one of the power load power supply modules is connected to the main bus.

4. The energy storage valve submodule according to claim 2, characterized in that: The control module also includes a battery control module, and the load power module also includes a battery load power module, the battery load power module is connected to the battery control module, and at least one of the battery load power modules is connected to the battery bus, and at least one of the battery load power modules is connected to the main bus; or, the battery load power modules are all connected to the main bus.

5. The energy storage valve submodule according to claim 4, characterized in that: The control module also includes an electric cabinet control module, and the load power module also includes an electric cabinet load power module. Each of the battery modules is correspondingly provided with one electric cabinet control module and more than two electric cabinet load power modules. Each of the electric cabinet control modules is respectively connected to the battery module and the battery control module. Each of the electric cabinet load power modules corresponding to each of the battery modules is respectively connected to the corresponding electric cabinet control module, and at least one of the electric cabinet load power modules is connected to the battery module, and at least one of the electric cabinet load power modules is connected to the main bus.

6. The energy storage valve submodule according to claim 5, characterized in that: It also includes a black start switch, a first end of which is connected to the battery control module, and a second end of which is connected to any one of the electric cabinet load power supply modules connected to the battery module.

7. The energy storage valve submodule according to any one of claims 1 to 6, characterized in that: The battery module includes a battery, a pre-charging resistor, a pre-charging switch device, a first charging switch device and a second charging switch device. The first end of the battery is connected to the first end of the pre-charging resistor and the first end of the first charging switch device, the second end of the pre-charging resistor is connected to the first end of the pre-charging switch device, the second end of the pre-charging switch device is connected to the second end of the first charging switch device and the battery bus, the second end of the battery is connected to the first end of the second charging switch device, and the second end of the second charging switch device is connected to the battery bus.

8. The energy storage valve submodule according to any one of claims 1 to 6, characterized in that: The load power supply module and the bus power supply module that draw power from the battery bus have a low power consumption operation mode, and / or are connected to the battery bus via a normally closed switch device.

9. The energy storage valve submodule according to any one of claims 2 to 6, characterized in that: It also includes an isolating switch, through which both ends of the DC support capacitor are connected to the battery bus, and the isolating switch is connected to the main bus and the control module respectively.

10. The energy storage valve submodule according to claim 9, characterized in that: The bus power module includes a first bus power module and a second bus power module, the first bus power module is connected to the battery bus and the main bus respectively, and the second bus power module is connected to the battery bus and the isolating switch respectively.

11. The energy storage valve submodule according to claim 9, characterized in that: The bus power supply module includes a switch device, an energy storage device and a DC converter. The battery bus is connected to the energy storage device through the switch device, the energy storage device is connected to the DC converter, and the DC converter connects the battery bus and the main bus.

12. The energy storage valve submodule according to any one of claims 1 to 6, characterized in that: The power module includes a power unit and a bypass switch, wherein the first AC end of the power unit is used to connect the first end of the bypass switch and to be cascaded with other energy storage valve submodules, the second AC end of the power unit is used to connect the second end of the bypass switch and to be cascaded with other energy storage valve submodules, the first DC end and the second DC end of the power unit are respectively connected to the DC support capacitor, and the control end of the power unit is connected to the control module.

13. An operating method based on the energy storage valve submodule according to any one of claims 1 to 12, characterized in that: The number of the battery modules includes more than two, and the operating method includes: When the start-up conditions are met, controlling any one of the battery modules to conduct the connection with the battery bus bar, so as to charge the bus power module through the battery bus bar; When the bus power module completes the establishment of the main bus, the remaining battery modules are connected to the battery bus.

14. The operating method according to claim 13, characterized in that: When the bus power module completes the establishment of the main bus, the method further includes: Taking energy from the main bus to control the power module to perform switching operation; When the voltage of the DC link capacitor is greater than a preset power supply startup voltage, energy is taken from the DC link capacitor to control the power module to perform a switching operation.

15. The operating method according to claim 13, characterized in that: Also includes: When a power supply failure occurs to the load power supply module currently supplying power, switching is performed to obtain power from another load power supply module with a different power obtaining mode.

16. The operating method according to claim 13, characterized in that: Also includes: When the starting voltage of the bus power module is lower than the voltage of the DC link capacitor, and the voltage of the DC link capacitor is lower than the voltage of the battery bus, the isolating switch between the battery bus and the DC link capacitor is controlled to be closed.

17. The operating method according to claim 13, characterized in that: Also includes: In the event of a failure in any of the battery modules, removing the failed battery module; The switch obtains energy from the load power supply module connected to the main bus to monitor the battery status information of the failed battery module.

18. An energy storage valve device, characterized in that: The invention comprises at least one energy storage valve submodule according to any one of claims 1 to 12.

19. The energy storage valve device according to claim 18, characterized in that: The load power supply module of the energy storage valve submodule also obtains energy from at least one of the DC bus and the battery module of the adjacent energy storage valve submodule; And / or, the load power supply module of the energy storage valve submodule also draws energy from the main busbar of the adjacent energy storage valve submodule.

20. An energy storage system, characterized in that: Including the energy storage valve device as described in any one of claims 18-19.

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