Energy storage system

Abstract

The utility model provides an energy storage system, and relates to the technical field of power grid management, and the energy storage system comprises an energy storage device, a switching device, and an AC function unit. Wherein the energy storage device is connected with an alternating current port of the energy storage system and is used for alternating current and direct current conversion and electric energy storage; the alternating current function unit is used for providing a supporting operation function for the energy storage system; the AC function unit is connected with the AC port through the switching device, and the switching device is used for controlling the commutation or disconnection of a power supply path of the AC function unit at a target phase. Therefore, the alternating current function unit is used for providing a supporting operation function for the energy storage system, the stability and the reliability of the energy storage system in the operation process are guaranteed, meanwhile, the application scene of the energy storage system is enriched, and the system is particularly suitable for the scene that a single-phase important load is connected to micro-grid energy storage three-phase alternating current.

Description

Technical Field

[0001] This application relates to the field of power grid management technology, and in particular to an energy storage system. Background Technology

[0002] With the development of power systems, low-voltage distribution networks play a crucial role in energy transmission and distribution. In my country, low-voltage distribution networks typically use 10kV / 0.4kV transformers to supply power to users in a three-phase four-wire system, forming a complex power supply network that mixes three-phase production power consumption with single-phase load power consumption. However, in actual operation, three-phase imbalance or excessively low voltage in one or two phases frequently occurs, which has many adverse effects on critical loads in key scenarios such as energy storage systems. In existing technologies, one approach is to detect and monitor three-phase imbalance using algorithms. However, these algorithms lack the ability to address the imbalance; once a problem is detected, they can only shut down or stop the equipment, leading to business interruption. Another approach addresses three-phase imbalance in AC power grids. While this approach has some function, its capabilities are limited. It is effective in addressing the phase with the largest deviation but cannot guarantee that the AC functional unit is at the optimal voltage of the affected phase, resulting in limitations and uncertainties. Yet another approach is an automatic three-phase voltage balancing charging system for electric vehicle charging stations. Although this system can resolve some three-phase imbalance issues through commutation devices and algorithmic optimization of load power, it can only guarantee the optimal output under the current capabilities and cannot ensure that the output voltage meets the normal operating requirements of the load. This makes it particularly unsuitable for scenarios where a single-phase critical load is connected to a three-phase AC power supply in a microgrid energy storage system. Utility Model Content

[0003] The purpose of this application is to provide an energy storage system in which an AC functional unit is used to provide support functions for the operation of the energy storage system, ensuring the stability and reliability of the energy storage system during operation. At the same time, it enriches the application scenarios of the energy storage system, especially suitable for scenarios where a single-phase important load is connected to a three-phase AC power supply for microgrid energy storage.

[0004] To achieve the above objectives, the technical solutions adopted in the embodiments of this application are as follows:

[0005] In a first aspect, embodiments of this application provide an energy storage system, including: an energy storage device, a switching device, and an AC functional unit; wherein, the energy storage device is connected to the AC port of the energy storage system and is used for AC-DC conversion and energy storage; the AC functional unit is used to provide support functions for the operation of the energy storage system;

[0006] The AC function unit is connected to the AC port through the switching device, which is used to control the commutation or disconnection of the power supply path of the AC function unit on the target phase.

[0007] Optionally, the switching device includes: a phase-commutation switch;

[0008] The first end of the phase-commutation switch is used to connect to the AC functional unit;

[0009] The multiple second terminals of the phase-changing switch are respectively connected to each phase of the AC port in a one-to-one correspondence, so as to enable the AC functional unit to perform switching between the phases of the AC port.

[0010] Optionally, the switching device further includes: a sampling unit and a first control unit, wherein the input terminal of the sampling unit is connected to the AC port, the output terminal of the sampling unit is connected to the first control unit, and multiple control terminals of the phase-changing switch are connected to the first control unit for controlling the on / off state of the power supply path between any phase in the AC port and the corresponding single-phase AC line.

[0011] Optionally, the switching device includes: a plurality of phase-changing switches; the AC functional units are divided into multiple groups, each group including at least one AC functional unit; each phase-changing switch is connected to at least one group of AC functional units in one group to perform phase-changing or disconnection of the power supply path of the at least one group of AC functional units.

[0012] Optionally, the AC function unit includes: a plurality of AC function components, wherein the plurality of commutation switches are connected one-to-one with the plurality of AC function components.

[0013] Optionally, the phase-changing switch is one unit, and the AC functional unit includes multiple AC functional components, with the phase-changing switch connected to all of the multiple AC functional components.

[0014] Optionally, the switching device includes: a plurality of controllable switches, the AC functional units being divided into multiple groups, each group including at least one AC functional unit; one end of each controllable switch is connected to any phase in the AC port, and the other end of each controllable switch is connected to at least one AC functional unit in a group, so as to perform disconnection or connection on the target relative to the at least one AC functional unit.

[0015] Optionally, the switching device further includes: a single-phase power module, at least one controllable switch, a second control unit, a rectifier, a first energy storage module, and an inverter;

[0016] The first end of the single-phase power module is connected to the AC port, the second end of the single-phase power module is connected to the corresponding single-phase AC line, the at least one controllable switch is connected between the corresponding single-phase AC line and each of the AC functional units, and the second control unit is connected to the control terminal of the at least one controllable switch for controlling the on / off of the power supply path between each AC functional unit and the corresponding single-phase AC line.

[0017] Optionally, the energy storage device includes: at least two energy storage converters connected in parallel and a second energy storage module;

[0018] The AC terminals of the at least two energy storage converters are all connected to the AC port, and the DC terminals of the at least two energy storage converters are all connected to the power supply terminal of the second energy storage module.

[0019] Optionally, the AC function unit includes at least one of the following: liquid cooling equipment, air conditioning equipment, fire detection device, dehumidification equipment, indicator light, and fan equipment.

[0020] This application provides an energy storage system, relating to the field of power grid management technology. The energy storage system comprises an energy storage device, a switching device, and an AC functional unit. The energy storage device connects to the AC port of the energy storage system for AC-DC conversion and energy storage, processing different forms of electrical energy to achieve efficient conversion between AC and DC, while effectively storing energy, reducing energy losses during conversion and storage, and improving the overall energy utilization efficiency of the energy storage system. The AC functional unit provides operational support for the energy storage system, ensuring its stability and reliability during operation. With stable AC support, the energy storage system can better cope with various operating conditions, reducing operational failures caused by external factors or internal fluctuations, extending the system's lifespan, and enriching its application scenarios. The AC functional unit connects to the AC port via the switching device, making the connection between the AC functional unit and the energy storage system more flexible. The switching device can quickly and accurately connect or disconnect AC functional components according to the operational needs of the energy storage system, facilitating maintenance, repair, and functional expansion of the energy storage system. The switching device is used to control the commutation or disconnection of the power supply path of the AC functional units at the target phase, ensuring that the energy storage system can rapidly switch power supply modes under different operating conditions, maintaining stable operation. Therefore, the modular design of the energy storage system in this application allows for cooperation between units while maintaining relative independence. This not only facilitates the installation and commissioning of the energy storage system but also provides convenience for subsequent functional expansion. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 A schematic diagram of the structure of an energy storage system provided in this application embodiment. Figure 1 ;

[0023] Figure 2 A schematic diagram of the structure of an energy storage system provided in this application embodiment. Figure 2 ;

[0024] Figure 3 A schematic diagram of the structure of an energy storage system provided in this application embodiment. Figure 3 ;

[0025] Figure 4 A schematic diagram of the structure of an energy storage system provided in this application embodiment. Figure 4 ;

[0026] Figure 5 A schematic diagram of the structure of an energy storage system provided in this application embodiment. Figure 5 ;

[0027] Figure 6 A schematic diagram of the structure of an energy storage system provided in this application embodiment. Figure 6 ;

[0028] Figure 7 A schematic diagram of the structure of an energy storage system provided in this application embodiment. Figure 7 ;

[0029] Figure 8 A schematic diagram of the structure of an energy storage system provided in this application embodiment. Figure 8 ;

[0030] Figure 9 A schematic diagram of the structure of an energy storage system provided in this application embodiment. Figure 9 ;

[0031] Figure 10 A schematic diagram of the structure of an energy storage system provided in this application embodiment. Figure 10 ;

[0032] Figure 11 A schematic diagram of the structure of an energy storage system provided in this application embodiment. Figure 10 one. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0035] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0036] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0037] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0038] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0039] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0040] To better understand the various solutions provided in the embodiments of this application, the following detailed description of an energy storage system provided in the embodiments of this application will be provided in conjunction with the accompanying drawings.

[0041] Figure 1 A schematic diagram of the structure of an energy storage system provided in this application embodiment. Figure 1 .like Figure 1 As shown, the energy storage system 100 may include: an energy storage device 110, a switching device 120, and an AC function unit 130.

[0042] Among them, the energy storage device 110 is connected to the AC port of the energy storage system 100 and is used for AC-DC conversion and energy storage; the AC function unit 130 is used to provide support functions for the operation of the energy storage system 100; the AC function unit 130 is connected to the AC port through the switch device 120 so as to supply power to the AC function unit 130 by controlling the on and off of the switch device 120.

[0043] The switching device 120 is used to control the commutation or disconnection of the power supply path of the AC functional unit 130 on the target phase.

[0044] The AC functional unit 130 can be understood as a single-phase AC load in the energy storage system. Figure 2 A schematic diagram of the structure of an energy storage system provided in this application embodiment. Figure 2 .like Figure 2 As shown, the AC function unit 130 may include at least one of the following: liquid cooling equipment, air conditioning equipment, fire detection device, dehumidification equipment, indicator light, and fan equipment.

[0045] The energy storage system provided in this application can be composed of an energy storage device, a switching device, and an AC functional unit. The energy storage device connects to the AC port of the energy storage system for AC-DC conversion and energy storage, processing different forms of electrical energy to achieve efficient conversion between AC and DC, while effectively storing energy, reducing energy losses during conversion and storage, and improving the overall energy utilization efficiency of the energy storage system. The AC functional unit provides support functions for the operation of the energy storage system, ensuring its stability and reliability during operation. With stable AC support, the energy storage system can better cope with various operating conditions, reduce operational failures caused by external factors or internal fluctuations, extend the service life of the energy storage system, and enrich its application scenarios. The AC functional unit connects to the AC port through the switching device, making the connection between the AC functional unit and the energy storage system more flexible. The switching device can quickly and accurately connect or disconnect AC functional components according to the operational needs of the energy storage system, facilitating maintenance, repair, and functional expansion of the energy storage system. The switching device is used to control the commutation or disconnection of the power supply path of the AC functional units at the target phase, ensuring that the energy storage system can rapidly switch power supply modes under different operating conditions, maintaining stable operation. Therefore, the modular design of the energy storage system in this application allows for cooperation between units while maintaining relative independence. This not only facilitates the installation and commissioning of the energy storage system but also provides convenience for subsequent functional expansion.

[0046] Furthermore, the switching device 120 provided in the embodiments of this application will be further described below with reference to the accompanying drawings. Figure 3 A schematic diagram of the structure of an energy storage system provided in this application embodiment. Figure 3 .like Figure 3 As shown, the switching device 120 may include a phase-changing switch 121.

[0047] The first end of the phase-change switch 121 is used to connect to the AC function unit 130; the multiple second ends of the phase-change switch 121 are respectively connected to each phase of the AC port to switch the AC function unit 130 between the phases of the AC port.

[0048] like Figure 3 As shown, the second end of the phase-switching switch 121 has three terminals, which are respectively connected to each phase (such as phase A, phase B and phase C) of the AC port in the energy storage system 100. The first end of the phase-switching switch 121 is connected to the AC functional unit 130 so as to supply power to the AC functional unit 130 through the phase-switching switch 121.

[0049] For example, Figure 4 A schematic diagram of the structure of an energy storage system provided in this application embodiment. Figure 4 .like Figure 4 As shown, the commutation switch 121 may include at least three sub-switch units K1.

[0050] Among them, one end of at least three sub-switching units K1 is connected to the multi-phase terminal of the AC port, and the other end of at least three sub-switching units K1 is connected to the AC function unit 130.

[0051] The switching device in the energy storage system provided in this application can be composed of a phase-switching switch. The first end of the phase-switching switch is used to connect the AC functional unit. Multiple second ends of the phase-switching switch are respectively connected to each phase of the AC port to switch the AC functional unit between the phases of the AC port. When the loads of different phases are unbalanced, the phase-switching switch connects the AC functional unit to the phase with the lighter load, balancing the loads of each phase and improving the overall operating efficiency of the energy storage system. Therefore, the AC functional unit in the energy storage system of this application has different requirements for the power supply phase at different operating stages. For example, during the charging stage, it can be switched to a specific phase to ensure efficient and stable charging. During the discharging stage, it switches to the most suitable phase according to the load demand to provide high-quality power to the load and meet the diverse functional requirements of the energy storage system. When a phase fails or malfunctions, the phase-switching switch can quickly switch the AC functional unit to other normal phases to maintain the normal operation of the energy storage system and ensure continuous power supply to critical equipment. Furthermore, by precisely switching the access phase of the AC functional unit, the harmonic content of the system can be effectively reduced, and power quality can be improved.

[0052] exist Figure 3 On this basis, Figure 5 A schematic diagram of the structure of an energy storage system provided in this application embodiment. Figure 5 .like Figure 5 As shown, the switching device 120 may further include a sampling unit 122 and a first control unit 123.

[0053] The sampling unit 122 has its input terminal connected to the AC port and its output terminal connected to the first control unit 123. This allows for the real-time acquisition of electrical parameters of the AC port, such as voltage, current, and phase information, and the transmission of this data to the first control unit 123. Multiple control terminals of the phase-changing switch 121 are connected to the first control unit 123 to control the connection and disconnection of the power supply path between any phase of the AC port and its corresponding single-phase AC line.

[0054] The first control unit 123 is used to accurately calculate and determine the operating status of the system based on these real-time data. When the load changes, the first control unit 123 can respond quickly by controlling the switching on and off of the phase-changing switch 121 to adjust the power supply phase of the AC functional unit 130 in a timely manner, ensuring that the energy storage system 100 is always in the optimal operating state and achieving dynamic adaptation to load changes. The first control unit 123 can be selected according to the actual situation; for example, the first control unit 123 can be an MCU (Microcontroller Unit).

[0055] It should be noted that the power supply of the first control unit 123 is a preset DC power supply (such as 3.3V, 12V or 24V power supply). It is obtained by converting the AC power of the AC port in the energy storage system 100 into a stable DC power supply through a preset AC-DC conversion device, thereby powering the first control unit 123.

[0056] The switching device in the energy storage system provided in this application further includes a sampling unit and a first control unit. The input terminal of the sampling unit is connected to an AC port, and the output terminal of the sampling unit is connected to the first control unit. Multiple control terminals of the phase-commutation switch are connected to the first control unit, used to control the on / off state of the power supply path between any phase in the AC port and the corresponding single-phase AC line. Thus, by continuously monitoring the electrical parameters of the AC port, the first control unit can be used to control the phase-commutation switch as needed, fine-tuning the access phase of the AC functional unit. This precise control can effectively reduce the harmonic content of the system, improve power quality, reduce the negative impact of power quality problems on the energy storage system and connected equipment, and extend the service life of the equipment.

[0057] exist Figure 3 On this basis, Figure 6 A schematic diagram of the structure of an energy storage system provided in this application embodiment. Figure 6.like Figure 6 As shown, the switching device 120 may include a plurality of phase-changing switches 121.

[0058] The AC functional units 130 are divided into multiple groups, each group including at least one AC functional unit 130. Each commutation switch 121 is connected to at least one group of AC functional units 130 in a group to perform commutation or disconnection of the power supply path of at least one group of AC functional units 130. Since each commutation switch 121 independently controls one group of AC functional units 130, when a commutation switch 121 or a group of AC functional units 130 fails, the impact of the fault is limited to that group and will not affect the entire energy storage system. For example, if a group of AC functional units 130 experiences a short circuit fault due to equipment aging, the corresponding commutation switch 121 can quickly cut off the power supply path of that group, preventing the fault from spreading and ensuring the normal operation of other groups of AC functional units 130, greatly improving the reliability and stability of the energy storage system.

[0059] The switching device in the energy storage system provided in this application includes: multiple commutator switches; AC functional units are divided into multiple groups, each group including at least one AC functional unit; each commutator switch is connected to at least one group of AC functional units in a group to perform commutation or disconnection of the power supply path for at least one group of AC functional units. Thus, after the AC functional units in this application are grouped, each commutator switch is only responsible for controlling the power supply path of one group of AC functional units. This allows operators to flexibly configure each commutator switch according to the actual operating needs of the energy storage system, and independently control the AC functional units in different groups. For example, during off-peak hours, some unnecessary AC functional unit groups can be shut down to reduce the energy consumption of the energy storage system; while during peak hours or in specific scenarios, the corresponding AC functional unit groups can be quickly activated to meet the different functional requirements of the energy storage system.

[0060] exist Figure 3 On this basis, Figure 7 A schematic diagram of the structure of an energy storage system provided in this application embodiment. Figure 7 .like Figure 7 As shown, the communication function unit 130 may include a plurality of communication function components 131.

[0061] In this system, multiple commutation switches 121 are connected one-to-one with multiple AC functional components 131. That is, each AC functional component 131 has a corresponding commutation switch, meaning the energy storage system can perform individual and precise control over each component. When the energy storage system needs to perform specific functions or cope with complex operating conditions, the operating status of each AC functional component 131 can be flexibly adjusted according to actual needs.

[0062] The AC functional unit in the energy storage system provided in this application includes multiple AC functional components and multiple commutation switches connected one-to-one with each AC functional component. Therefore, the requirements of each AC functional component may change at different operating stages of the energy storage system. Through the one-to-one corresponding commutation switches, the system can quickly respond to these changes, adjusting the activation or deactivation of the AC functional components in a timely manner to ensure that the energy storage system is always in optimal operating condition. Once an AC functional component fails, the corresponding commutation switch can quickly cut off its power supply, limiting the fault to a single component and preventing the fault from spreading to other components, thereby ensuring the stable operation of the entire energy storage system.

[0063] exist Figure 3 On this basis, Figure 8 A schematic diagram of the structure of an energy storage system provided in this application embodiment. Figure 8 .like Figure 8 As shown, the phase-changing switch 121 is one unit, and the AC function unit 130 may include multiple AC function components 131.

[0064] The commutation switch 121 is connected to all of the multiple AC functional components 131 for centralized and unified control. When the operating conditions of the energy storage system 100 change, such as switching from charging to discharging, the commutation switch 121 can quickly adjust the operating status of all components, achieving efficient coordination among the components and ensuring the stable operation of the energy storage system 100.

[0065] The energy storage system provided in this application uses a single commutator switch, while the AC functional unit can be composed of multiple AC functional components. The commutator switch is connected to all of these AC functional components. Therefore, the commutator switch in this application can dynamically adjust the input and output parameters of each AC functional component according to the overall operational requirements of the energy storage system, enabling the AC functional unit to achieve its optimal operating state.

[0066] exist Figure 1 On this basis, Figure 9 A schematic diagram of the structure of an energy storage system provided in this application embodiment. Figure 9 .like Figure 9 As shown, the switching device 120 may include a plurality of controllable switches K2.

[0067] The AC functional unit 130 is divided into multiple groups, each group including at least one AC functional unit 130; one end of each controllable switch K2 is connected to any phase in the AC port, and the other end of each controllable switch K2 is connected to at least one AC functional unit 130 in a group, so as to perform disconnection or connection on the target relative to at least one AC functional unit 130. After the AC functional units 130 are grouped, each controllable switch K2 is connected to the AC functional units 130 of a specific group, and the power supply status of each group of AC functional units 130 can be flexibly adjusted according to different load requirements.

[0068] Among them, the controllable switch K2 can be understood as a regular switch assembly. It can be selected according to the actual situation.

[0069] The switching device in the energy storage system provided in this application includes: multiple controllable switches, with AC functional units divided into multiple groups, each group including at least one AC functional unit; one end of each controllable switch is connected to any phase in the AC port, and the other end of each controllable switch is connected to at least one AC functional unit in a group, so as to disconnect or connect the target relative to at least one AC functional unit. Therefore, when a fault occurs in a group of AC functional units or a controllable switch connected to it, the impact of the fault is limited to that group and will not spread to the entire energy storage system. Furthermore, through real-time monitoring and control of the controllable switches, potential faults can be detected and addressed promptly. At the same time, compared to equipping each AC functional unit with an independent switching device, the group control method reduces the number of controllable switches and lowers equipment procurement costs.

[0070] Figure 10 A schematic diagram of the structure of an energy storage system provided in this application embodiment. Figure 10 .like Figure 10 As shown, the switching device 120 may further include: a single-phase power supply module 124, at least one controllable switch K2, and a second control unit 125.

[0071] The first end of the single-phase power module 124 is connected to the AC port to supply power to the single-phase power module 124 through the AC port; the second end of the single-phase power module 124 is connected to the corresponding single-phase AC line; at least one controllable switch K2 is connected between the corresponding single-phase AC line and each AC functional unit 130; the second control unit 125 is connected to the control terminal of at least one controllable switch K2 to control the on / off of the power supply path between each AC functional unit 130 and the corresponding single-phase AC line. Since each AC functional unit 130 has an independent controllable switch K2, the high cost and other problems caused by the high battery capacity resulting from the use of the single-phase power module 124 can be avoided.

[0072] The single-phase power module 124 may include a rectifier 126, a first energy storage module 127, and an inverter (DCAC). The single-phase power module 124 may be a three-phase input, single-phase output single-phase power module, represented by a UPS (Uninterruptible Power Supply).

[0073] The input terminal of rectifier 126 is the first terminal of single-phase power module 124, used to connect to the AC port. The output terminal of rectifier 126 is connected to inverter DCAC through first energy storage module 127 to convert the AC power of AC port into DC power through rectifier 126 to charge first energy storage module 127. At the same time, first energy storage module 127 is connected to the corresponding single-phase AC line through inverter DCAC to convert the DC power stored in first energy storage module 127 into stable and standard 220V AC sinusoidal power through inverter DCAC to power single-phase AC line. This avoids frequent switching between multiple phases (such as phase A, phase B and phase C) in AC port, further prioritizing important loads, and then selectively switching according to the priority of each group of multiple AC functional units 130 to save the capacity of single-phase power module 124. When the mains power is abnormal or interrupted, the rectifier 126 stops working, the first energy storage module 127 releases electrical energy, and the inverter DCAC converts the direct current to single-phase alternating current to maintain the operation of the load (such as multiple AC functional units 130). The preset priority order can be reasonably classified according to the importance of the AC functional units in providing support functions for the energy storage system. For example, the liquid cooling equipment and fire detection device have high priority; the dehumidification equipment and indicator lights have medium priority; and the fan equipment has low priority.

[0074] The second control unit 125 can be used for precise control of the controllable switch K2. When an AC functional unit 130 experiences overload or failure, it can quickly disconnect the AC functional unit 130 from the single-phase AC line to prevent the fault from spreading and prioritize the power supply to other critical AC functional units, thereby improving the reliability and stability of the entire energy storage system. The second control unit 125 can be selected according to actual conditions; for example, it can be an MCU (Microcontroller Unit). The power supply for the second control unit 125 is a preset DC power supply (such as 3.3V, 12V, or 24V), which is converted from AC power at the AC port of the energy storage system 100 to stable DC power through a preset AC-DC converter connected to the AC port, thus powering the second control unit 125.

[0075] The first energy storage module 127 can be selected according to the actual situation. For example, the first energy storage module 127 can be a battery.

[0076] The switching device in the energy storage system provided in this application further includes: a single-phase power module, at least one controllable switch, and a second control unit. The first end of the single-phase power module is connected to an AC port, and the second end is connected to a corresponding single-phase AC line. At least one controllable switch is connected between the corresponding single-phase AC line and each AC functional unit, enabling the switching device to adapt to different types and power levels of AC functional units, meeting diverse application requirements. The second control unit is connected to the control terminal of at least one controllable switch and is used to control the on / off state of the power supply path between each AC functional unit and its corresponding single-phase AC line. Therefore, each AC functional unit in this application has a controllable switch for each path, avoiding frequent switching between phases of the AC port, and prioritizing and selecting partial or full power supply to each AC functional unit. Furthermore, because each AC functional unit has an independent controllable switch, the high cost and other problems caused by using single-phase power modules can be avoided, improving the reliability of the energy storage system.

[0077] exist Figure 1 On this basis, Figure 11 A schematic diagram of the structure of an energy storage system provided in this application embodiment. Figure 10 1. For example Figure 11 As shown, the energy storage device 110 may include at least two energy storage converters PCS connected in parallel and a second energy storage module 111.

[0078] Multiple energy storage converters (PCS) are connected in parallel, which greatly increases the total power capacity of the energy storage device 110. The AC terminals of at least two energy storage converters (PCS) are connected to AC ports to supply power to the multiple energy storage converters (PCS), and the DC terminals of at least two energy storage converters (PCS) are connected to the power supply terminals of the second energy storage module 111 to charge the power supply terminals of the second energy storage module 111.

[0079] The second energy storage module 111 can be selected according to the actual situation. For example, the second energy storage module 111 can be a battery.

[0080] The energy storage device in the energy storage system provided in this application includes: at least two energy storage converters and a second energy storage module connected in parallel; wherein the AC terminals of at least two energy storage converters are all connected to AC ports, and the DC terminals of at least two energy storage converters are all connected to the power supply terminal of the second energy storage module. Therefore, the multiple energy storage converters in this application process power conversion in parallel, which, compared to a single energy storage converter, can respond more quickly to the power change requirements of the energy storage system, reduce power fluctuations, and further optimize power quality.

[0081] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. An energy storage system, characterized in that, include: Energy storage devices, switching devices, and AC functional units; The energy storage device is connected to the AC port of the energy storage system and is used for AC-DC conversion and energy storage; the AC functional unit is used to provide support functions for the operation of the energy storage system. The AC function unit is connected to the AC port through the switching device, and the switching device is used to control the commutation or disconnection of the power supply path of the AC function unit on the target phase; The switching device includes: a phase-commutation switch, a sampling unit, and a first control unit. The first terminal of the commutation switch is used to connect to the AC function unit; The multiple second terminals of the phase-changing switch are respectively connected to each phase of the AC port in a one-to-one correspondence, so as to enable the AC functional unit to perform switching between the phases of the AC port. The input terminal of the sampling unit is connected to the AC port, the output terminal of the sampling unit is connected to the first control unit, and the multiple control terminals of the phase-changing switch are connected to the first control unit, for controlling the on / off of the power supply path between any phase in the AC port and the corresponding single-phase AC line.

2. The energy storage system according to claim 1, characterized in that, The switching device includes: a plurality of phase-commutating switches; the AC functional units are divided into multiple groups, each group including at least one AC functional unit; each phase-commutating switch is connected to at least one group of AC functional units in one group to perform phase commutation or disconnection of the power supply path of the at least one group of AC functional units.

3. The energy storage system according to claim 2, characterized in that, The AC function unit includes: multiple AC function components, and the multiple phase-changing switches are connected to the multiple AC function components in a one-to-one correspondence.

4. The energy storage system according to claim 1, characterized in that, The phase-changing switch is one unit, and the AC functional unit includes multiple AC functional components, with the phase-changing switch connected to all of the multiple AC functional components.

5. The energy storage system according to claim 1, characterized in that, The switching device includes: a plurality of controllable switches, the AC functional units being divided into multiple groups, each group including at least one AC functional unit; one end of each controllable switch is connected to any phase of the AC port, and the other end of each controllable switch is connected to at least one AC functional unit in a group, so as to perform disconnection or connection on the target relative to the at least one AC functional unit.

6. The energy storage system according to claim 5, characterized in that, The switching device further includes: a single-phase power supply module, at least one controllable switch, and a second control unit; The first end of the single-phase power module is connected to the AC port, the second end of the single-phase power module is connected to the corresponding single-phase AC line, the at least one controllable switch is connected between the corresponding single-phase AC line and each of the AC functional units, and the second control unit is connected to the control terminal of the at least one controllable switch for controlling the on / off of the power supply path between each AC functional unit and the corresponding single-phase AC line.

7. The energy storage system according to claim 1, characterized in that, The energy storage device includes: at least two energy storage converters connected in parallel and a second energy storage module; The AC terminals of the at least two energy storage converters are all connected to the AC port, and the DC terminals of the at least two energy storage converters are all connected to the power supply terminal of the second energy storage module.

8. The energy storage system according to any one of claims 1 to 7, characterized in that, The communication function unit includes at least one of the following: liquid cooling equipment, air conditioning equipment, fire detection device, dehumidification equipment, indicator light, and fan equipment.

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