energy storage system

Abstract

This application provides an energy storage system, including: an interface electrically connected to an external power supply device; a first power compensation device, one end of which is electrically connected to the interface; and a second power compensation device, one end of which is electrically connected to the interface and the other end of which is electrically connected to a battery device. The first power compensation device is configured to provide or absorb reactive power to the power supply device, and the second power compensation device is configured to provide or absorb reactive power and / or active power to the power supply device. This system can reduce the cost of the energy storage system while improving the stability of the power supply from the power supply device.

Description

Technical Field

[0001] This application relates to the field of energy storage, and more specifically, to an energy storage system. Background Technology

[0002] In modern power systems, with the large-scale grid integration of renewable energy sources (such as wind and solar power) and increasingly complex load demands, grid stability and power quality face severe challenges. In energy storage systems, where bidirectional energy exchange occurs between the grid and battery devices, grid stability is crucial for building a robust modern power system. Therefore, improving grid stability is an urgent problem to be solved. Utility Model Content

[0003] This application provides an energy storage system that can reduce the cost of the energy storage system while improving the stability of power supply from external power sources.

[0004] In a first aspect, this application provides an energy storage system, including an interface, a first power compensation device, and a second power compensation device, wherein the interface is electrically connected to an external power supply device, one end of the first power compensation device is electrically connected to the interface, and the other end of the second power compensation device is electrically connected to a battery device; wherein the first power compensation device is configured to provide or absorb reactive power to the power supply device, and the second power compensation device is configured to provide or absorb reactive power and / or active power to the power supply device.

[0005] In this embodiment, by configuring the first power compensation device to provide or absorb reactive power to the power supply device, and the second power compensation device to provide or absorb reactive power and / or active power to the power supply device, on the one hand, by adding the first power compensation device for reactive power compensation or absorption, the dependence on the second power compensation device can be reduced, thereby reducing the number of second power compensation devices in the energy storage system and reducing the cost of the energy storage system; on the other hand, both the first and second power compensation devices can provide or absorb reactive power to the power supply device, that is, in the event of a failure of one device, reactive power can be provided or absorbed by the other device, thereby improving the reliability and stability of the energy storage system.

[0006] In some embodiments, the energy storage system further includes: a controller for controlling the first power compensation device to be configured to provide or absorb reactive power to the power supply device; and / or, the controller for controlling the second power compensation device to be configured to provide or absorb reactive power and / or active power to the power supply device.

[0007] In this embodiment, a controller configures a first power compensation device to provide or absorb reactive power to a power supply device; and / or, the controller controls a second power compensation device to provide or absorb reactive power and / or active power to a power supply device. The controller can coordinate the first and second power compensation devices for active or reactive power compensation, thereby improving the performance of the energy storage system and enhancing the stability of the external power supply device. Furthermore, by adjusting the first and second power compensation devices, the dependence on the second power compensation device can be reduced, thus reducing the number of second power compensation devices in the energy storage system and lowering its cost. Additionally, both the first and second power compensation devices can provide or absorb reactive power to the power supply device; that is, if one device fails, the controller can control the other device to provide or absorb reactive power to the power supply device, improving the reliability and stability of the energy storage system.

[0008] In some embodiments, the energy storage system further includes: a first sensor, one end of which is electrically connected to an interface, and the other end of which is electrically connected to the junction of a first power compensation device and a second power compensation device, the first sensor being used to detect the voltage value and / or frequency value of the power supply device; wherein, the controller is used to control the first power compensation device to be configured to provide or absorb reactive power to the power supply device according to the voltage value; and / or, the controller is used to control the second power compensation device to be configured to provide or absorb reactive power and / or active power to the power supply device according to the voltage value and / or frequency value.

[0009] In this embodiment, a first sensor, positioned between the power supply device and the junction of the first and second power compensation devices, detects the voltage and / or frequency values ​​of the power supply device. The controller, based on the voltage values, configures the first power compensation device to provide or absorb reactive power to the power supply device, thereby accurately compensating for or absorbing reactive power in the power supply device. And / or, based on the voltage and / or frequency values, the controller configures the second power compensation device to provide or absorb reactive power and / or active power to the power supply device. The controller adjusts the settings according to the voltage and / or frequency values, i.e., based on voltage or frequency variations on the power supply device side. The controller compensates for or absorbs reactive or active power from the power supply device, thereby improving the performance of the energy storage system and enhancing the stability of the power supply device. In addition, by adjusting the first power compensation device and the second power compensation device through the controller, the dependence on the second power compensation device can be reduced, thereby reducing the number of second power compensation devices in the energy storage system and reducing the cost of the energy storage system. Furthermore, both the first power compensation device and the second power compensation device can provide or absorb reactive power to the power supply device. That is, if one device fails, the controller can control the other device to provide or absorb reactive power to the power supply device, thereby improving the reliability and stability of the energy storage system.

[0010] In some embodiments, the interface is a busbar, one end of which is electrically connected to a power supply device and the other end is electrically connected to a first power compensation device and a second power compensation device; wherein, the power supply device is used to obtain external power, and the busbar is used to distribute the external power to the first power compensation device and / or the second power compensation device.

[0011] In this embodiment of the application, the interface is a busbar, which is used for the electrical connection between the first power compensation device and the second power compensation device and the power grid. This allows the power supply device to provide power to the first power compensation device and the second power compensation device. In the event of instability in the power supply device, the first power compensation device and / or the second power compensation device can first provide or absorb active or reactive power to the power grid, thereby improving the stability and reliability of the power supply device.

[0012] In some embodiments, the energy storage system further includes: a second sensor, one end of which is electrically connected to the busbar and the other end of which is electrically connected to the first power compensation device or the second power compensation device, the second sensor being used to detect the current value of the first power compensation device or the second power compensation device; a controller, which, based on the voltage value and the current value, controls the first power compensation device to be configured to provide or absorb reactive power to the power supply device; and / or, the controller is used to, based on the voltage value and the current value; and / or the frequency value, control the second power compensation device to be configured to provide or absorb reactive power and / or active power to the power supply device.

[0013] In this embodiment, a second sensor, positioned between the busbar and the first or second power compensation device, detects the current value of the first or second power compensation device. The controller, based on the voltage and current values, configures the first power compensation device to provide or absorb reactive power to the power supply device, thereby accurately compensating for or absorbing reactive power in the power supply device. And / or, the controller, based on the voltage, current, and / or frequency values, configures the second power compensation device to provide or absorb reactive power and / or active power to the power supply device. The controller's actions are based on voltage and current values ​​and / or frequency values, i.e., voltage fluctuations or frequency variations on the power supply device side. The changes allow the controller to compensate for or absorb reactive or active power from the power supply unit, thereby improving the performance of the energy storage system and enhancing the stability of the power supply unit. In addition, by adjusting the first and second power compensation devices, the controller can reduce the dependence on the second power compensation device, thus reducing the number of second power compensation devices in the energy storage system and lowering the cost. Furthermore, both the first and second power compensation devices can provide or absorb reactive power to the power supply unit. That is, if one device fails, the controller can control the other device to provide or absorb reactive power to the power supply unit, thereby improving the reliability and stability of the energy storage system.

[0014] In some embodiments, the first power compensation device includes a first modulator and a first inverter; wherein the first modulator is used to adjust the current phase of the first inverter to provide or absorb reactive power to the power supply device.

[0015] In this embodiment of the application, the current phase of the first inverter is adjusted by the first regulator in the first power compensation device, thereby providing or absorbing reactive power to the power supply device to improve the stability and reliability of the power supply device.

[0016] In some embodiments, the first power compensation device further includes a support capacitor and a filter, the DC side of the first inverter is electrically connected to the support capacitor, the AC side of the first inverter is electrically connected to the filter, and the filter is electrically connected to the power supply device.

[0017] In this embodiment, the first power compensation device needs to rapidly absorb or release energy when compensating for reactive power, and the supporting capacitor can smooth out instantaneous fluctuations in the DC bus voltage. Furthermore, in the event of a sudden voltage drop or short circuit in the grid, the supporting capacitor provides short-term energy support, preventing damage to the first power compensation device caused by the sudden drop in DC side voltage. The filter can efficiently suppress high-order harmonics, ensuring that the output current meets grid standards. Additionally, the filter can limit the inverter output to reduce stress on the insulated-gate bipolar transistor, extending its service life and thus extending the service life of the first power compensation device.

[0018] In some embodiments, the second power compensation device includes a bidirectional converter; wherein, when the battery device is configured to charge and discharge, the bidirectional converter is used for energy conversion between the battery device and the power supply device to provide or absorb reactive power and / or active power to the power supply device.

[0019] In this embodiment, the bidirectional converter in the second power compensation device is used for energy conversion between the battery device and the power supply device to provide or absorb reactive power and / or active power to the power supply device, thereby realizing efficient and flexible energy interaction between the battery device and the power grid, and thus improving the stability of the power grid.

[0020] In some embodiments, the second power compensation device further includes a second modulator and a second inverter; wherein the second modulator is used to adjust the current phase of the second inverter to provide or absorb reactive power to the power supply device.

[0021] In this embodiment of the application, the current phase of the second inverter is adjusted by the second regulator in the second power compensation device, thereby providing or absorbing reactive power to the power supply device to improve the stability and reliability of the power supply device.

[0022] In some embodiments, the second power compensation device includes a plurality of first sub-power compensation devices, which are connected in parallel; the first sub-power compensation device includes a plurality of second sub-power compensation devices, which are connected in series.

[0023] In this embodiment, multiple first sub-power compensation devices are connected in parallel, with the total output power being the sum of the output power of each device, thus meeting high-capacity requirements. Furthermore, in the event of a failure in a single first sub-power compensation device, the remaining devices can continue to operate, improving the stability of the energy storage system. Additionally, multiple second sub-power compensation devices are connected in series, allowing for adaptation to different grid voltage levels and flexible handling of various grid voltage scenarios. Attached Figure Description

[0024] Figure 1 A partial structural schematic diagram of a battery device provided in an embodiment of this application is shown.

[0025] Figure 2 A schematic diagram of the structure of an energy storage system provided in an embodiment of this application is shown.

[0026] Figure 3 A schematic diagram of another energy storage system provided in an embodiment of this application is shown.

[0027] Figure 4A schematic diagram of another energy storage system provided in an embodiment of this application is shown.

[0028] Figure 5 A schematic diagram of another energy storage system provided in an embodiment of this application is shown.

[0029] Figure 6 A schematic diagram of another energy storage system provided in an embodiment of this application is shown.

[0030] Figure 7 A schematic diagram of the structure of a first power compensation device provided in an embodiment of this application is shown.

[0031] Figure 8 A schematic diagram of another energy storage system provided in an embodiment of this application is shown.

[0032] Figure 9 A schematic diagram of the structure of a second power compensation device provided in an embodiment of this application is shown.

[0033] Figure 10 A schematic diagram of another second power compensation device provided in an embodiment of this application is shown.

[0034] Figure 11 A schematic diagram of another energy storage system provided in an embodiment of this application is shown.

[0035] Figure label:

[0036] Energy storage system 100; battery device 110; housing 11; first housing section 111; second housing section 112; battery cell 12; interface 120; power supply device 101; first power compensation device 102; second power compensation device 103; controller 104; first sensor 105; power grid 1011; bus 1012; second sensor 106; first modulator 1021; first inverter 1022; IGBT 1023; filter 1024; supporting capacitor 1025; bidirectional converter 1031; second inverter 1033; second modulator 1032; first sub-power compensation device 1034; second sub-power compensation device 1035. Detailed Implementation

[0037] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this application by way of example, but should not be used to limit the scope of this application, that is, this application is not limited to the described embodiments.

[0038] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the specification of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings of this application are used to distinguish different objects, rather than to describe a specific order or hierarchy.

[0039] The directional terms used in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of this application. It should also be noted in the description of this application that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0040] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0041] In this application, "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more (including two), and "multiple pieces" refers to two or more (including two).

[0042] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0043] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0044] Unless otherwise specified, all steps of this application may be performed sequentially or randomly, preferably sequentially. For example, the method includes steps (a) and (b), indicating that the method may include steps (a) and (b) performed sequentially, or it may include steps (b) and (a) performed sequentially. For example, the mention that the method may also include step (c) indicates that step (c) may be added to the method in any order; for example, the method may include steps (a), (b), and (c), or it may include steps (a), (c), and (b), or it may include steps (c), (a), and (b), etc.

[0045] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0046] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0047] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0048] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0049] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0050] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0051] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0052] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0053] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0054] This application provides an energy storage device including one or more battery clusters to increase the voltage and capacity of the energy storage device. The battery cluster may include multiple battery devices, which are connected in series via a busbar to increase the voltage of the energy storage device. When the energy storage device includes multiple battery clusters, the multiple battery clusters are connected in parallel to increase the capacity of the energy storage device.

[0055] Energy storage devices can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems. Energy storage devices can store electrical energy as needed and output it when appropriate. For example, an energy storage device can store electrical energy during off-peak hours and provide power to relevant users or electrical equipment during peak hours. The energy storage system provided in this application embodiment can be any power system that requires energy storage devices.

[0056] In some embodiments, the energy storage device is an energy storage container or an energy storage cabinet.

[0057] In some embodiments, the energy storage device may include a cabinet and one or more battery clusters housed within the cabinet.

[0058] In some embodiments, the energy storage device may include modules such as a thermal management module, a main control module, a central control module, a power distribution module, and a fire protection module.

[0059] As an example, the thermal management module may include a liquid cooling unit that supplies coolant to each battery device via piping to regulate the temperature of the individual battery cells.

[0060] As an example, the main control module can serve as the battery management unit for the battery cluster, used to monitor and manage the battery cluster. The main control module can monitor information such as the current, voltage, power, or temperature of the battery cluster. For instance, it can control the charging and discharging current and voltage of the battery cluster. The main control module includes modules such as an auxiliary battery management unit (SBMU) and a fusion switch.

[0061] As an example, the central control module can serve as the battery management unit for an energy storage device, used to monitor and manage the device. The central control module can monitor information such as the energy storage device's current, voltage, power, state of charge, or temperature. For instance, it can control the charging and discharging current and voltage of the energy storage device. As an example, the central control module includes modules such as an Insulation Monitoring Module (IMM), a Master Battery Management Unit (MBMU), an Ethernet (ETH) module, and a fiber optic conversion module.

[0062] As an example, a fire protection system includes control panels, detectors, alarm devices, etc., used to detect, alarm, or extinguish fires in energy storage systems.

[0063] As an example, the power distribution unit can be used to distribute power to the power modules of the energy storage device.

[0064] In some embodiments, the energy storage system may include one or more energy storage devices and a power conversion system (PCS), wherein the power conversion system is used to connect the power generation device and the energy storage device. The power generation device generates electrical energy, which can be stored in the energy storage device through the power conversion system. As examples, the power generation device may specifically be a solar panel, hydroelectric power generation device, thermal power generation device, wind power generation device, etc. The specific type of power generation device is not limited in this application.

[0065] This application provides a charging network including a charging pile and an energy storage device. The charging pile is electrically connected to the energy storage device, which provides power to the charging pile. The charging pile is electrically connected to a battery device in the energy storage device via a cable, and the battery device can provide its stored electrical energy to the charging pile. The charging pile has one or more connectors for connecting to electrical equipment (such as a vehicle), thereby enabling the charging equipment to be recharged.

[0066] Currently, in energy storage systems, the power grid experiences voltage or power fluctuations due to external environmental interference or load changes, leading to grid instability. Energy storage systems need to provide active or reactive power to the power grid to reduce grid fluctuations and improve grid stability.

[0067] In energy storage systems, active and reactive power compensation to the power grid is usually achieved through PCS (Power Control System) within the energy storage system. However, setting up a large number of PCS for active and reactive power compensation is costly, and in the event of a PCS failure, neither active nor reactive power compensation can be performed, which is detrimental to the stability of the power grid.

[0068] Based on the above considerations, in order to reduce the cost of energy storage systems while improving grid stability, this application provides an energy storage system, including an interface, a first power compensation device, and a second power compensation device. The interface is electrically connected to a power supply device. One end of the first power compensation device is electrically connected to the interface. The other end of the second power compensation device is electrically connected to the interface and to a battery device. The first power compensation device is configured to provide or absorb reactive power to the power supply device, and the second power compensation device is configured to provide or absorb reactive power and / or active power to the power supply device. By configuring the first power compensation device to provide or absorb reactive power to the power supply device, and the second power compensation device to provide or absorb reactive power and / or active power to the power supply device, on the one hand, by adding the first power compensation device for reactive power compensation or absorption, the dependence on the second power compensation device can be reduced, thereby reducing the number of second power compensation devices in the energy storage system and reducing the cost of the energy storage system; on the other hand, both the first and second power compensation devices can provide or absorb reactive power to the power supply device, that is, in the event of a failure of one device, reactive power can be provided or absorbed by the other device, thereby improving the reliability and stability of the energy storage system.

[0069] Figure 1 A partial structural schematic diagram of a battery device 110 provided in an embodiment of this application is shown. For example... Figure 1 As shown, the battery device 110 of this application embodiment may include a plurality of battery cells 12 to meet different power usage requirements. The shape of the battery cell 12 in this application embodiment can be set according to actual application. For example, the battery cell 12 can be as follows: Figure 1 The cylindrical shape shown, or it could be different. Figure 1 The embodiments shown may be cuboids or other shapes, but are not limited to these.

[0070] It should be understood that, such as Figure 1As shown, the battery device 110 of this embodiment may further include a housing 11, which can be used to accommodate multiple battery cells 12. The housing 11 of this embodiment has a hollow interior, and the multiple battery cells 12 are accommodated within the housing 11. The housing 11 may include two parts, referred to herein as a first housing portion 111 and a second housing portion 112, which are fastened together. The shapes of the first housing portion 111 and the second housing portion 112 can be determined according to the shape of the components housed inside, for example, according to the shape of the combination of the multiple battery cells 12 housed inside. At least one of the first housing portion 111 and the second housing portion 112 has an opening. For example, as... Figure 1 As shown, the first housing portion 111 and the second housing portion 112 can both be hollow cuboids with one open side each. The openings of the first housing portion 111 and the second housing portion 112 are opposite to each other, and the first housing portion 111 and the second housing portion 112 are interlocked to form a housing 11 with a closed chamber, which can be used to accommodate multiple battery cells 12. The multiple battery cells 12 are connected in parallel, series, or mixed and placed inside the housing 11 formed by the interlocking of the first housing portion 111 and the second housing portion 112.

[0071] For example, unlike Figure 1 As shown, either the first housing portion 111 or the second housing portion 112 may have only one hollow cuboid with an opening, while the other is plate-shaped to cover the opening. Taking the second housing portion 112 as a hollow cuboid with one opening, and the first housing portion 111 as a plate-shaped example, then the first housing portion 111 covers the opening of the second housing portion 112 to form a housing 11 with a closed chamber, which can be used to accommodate multiple battery cells 12.

[0072] Figure 2 A schematic diagram of the structure of an energy storage system 100 provided in an embodiment of this application is shown.

[0073] According to some embodiments of this application, such as Figure 2 As shown, this application provides an energy storage system 100, including an interface 120, a first power compensation device 102, and a second power compensation device 103. The interface 120 is electrically connected to an external power supply device 101. One end of the first power compensation device 102 is electrically connected to the interface 120. One end of the second power compensation device 103 is electrically connected to the interface 120, and the other end is electrically connected to a battery device 110. The first power compensation device 102 is configured to provide or absorb reactive power to the power supply device 101, and the second power compensation device 103 is configured to provide or absorb reactive power and / or active power to the power supply device 101.

[0074] It should be understood that the power supply device 101 can provide power to the first power compensation device 102 and the second power compensation device 103 through the interface 120. Specifically, the power supply device 101 can be connected to the battery device 110 which is electrically connected to the second power compensation device 103, so that energy transfer and interaction between the power supply device 101 and the battery device 110 can be realized. The battery device 110 can be charged, that is, absorb electrical energy from the power supply device 101; the battery device 110 can also be discharged, that is, the battery device 110 releases electrical energy to the power supply device 101.

[0075] It should also be understood that the first power compensation device 102 and / or the second power compensation device 103 provide or absorb reactive power or active power from the power supply device 101 because the power supply device 101, for example, the power grid, is affected by external environmental interference or sudden load changes, resulting in an imbalance in the power grid. The energy storage system 100 needs to regulate the frequency or voltage of the power grid to achieve grid stability. Specifically, frequency regulation or voltage regulation means providing active power or reactive power to the power grid for compensation.

[0076] It should also be understood that there can be multiple first power compensation devices 102, which can be connected in parallel, in series, or in a mixed series-parallel connection; there can also be multiple second power compensation devices 103, which can be connected in parallel, in series, or in a mixed series-parallel connection. This application does not impose any limitations on this.

[0077] It should also be understood that the power supply device 101 may include the power grid, or other equipment or devices that provide power to the energy storage system 100, and this application does not limit it in any way. The interface 120 may be a busbar for electrically connecting the power supply device 101 with the first power compensation device 102 and the second power compensation device 103. The interface 120 may also be a pre-charge circuit, etc., and this application does not limit it in any way.

[0078] Optionally, both the first power compensation device 102 and the second power compensation device 103 can provide or absorb reactive power to the power supply device 101. The number of the first power compensation device 102 and the second power compensation device 103 can be determined according to the overall capacity of the energy storage system 100, where the overall capacity of the energy storage system 100 can refer to both its power capacity and energy capacity. Specifically, when the overall capacity of the energy storage system 100 is large, the number of second power compensation devices 103 needs to be increased because the second power compensation devices 103 also need to provide active power compensation. When the overall capacity of the energy storage system 100 is small, the number of second power compensation devices 103 can be reduced, and the number of first power compensation devices 102 can be increased. Active power compensation is performed by the second power compensation devices 103, and reactive power compensation is performed by the first power compensation devices 102, thereby reducing the number of second power compensation devices 103. This reduces the cost of the energy storage system 100 while improving the stability and reliability of the power supply device 101.

[0079] In this embodiment, by configuring the first power compensation device 102 to provide or absorb reactive power to the power supply device 101, and the second power compensation device 103 to provide or absorb reactive power and / or active power to the power supply device 101, on the one hand, by adding the first power compensation device 102 for reactive power compensation or absorption, the dependence on the second power compensation device 103 can be reduced, thereby reducing the number of second power compensation devices 103 in the energy storage system 100 and reducing the cost of the energy storage system 100; on the other hand, both the first power compensation device 102 and the second power compensation device 103 can provide or absorb reactive power to the power supply device 101, that is, in the event of a failure of one device, reactive power can be provided or absorbed by the other device, thereby improving the reliability and stability of the energy storage system 100. Furthermore, when the number of second power compensation devices 103 is large, it is difficult to avoid circulating current and oscillation problems between devices; increasing the number of first power compensation devices 102 can reduce problems such as circulating current and oscillation between devices.

[0080] Figure 3 A schematic diagram of the structure of another energy storage system 100 provided in an embodiment of this application is shown.

[0081] Optionally, based on some embodiments of this application, reference may be made to... Figure 2 and Figure 3As described above, the energy storage system 100 further includes: a controller 104 for controlling the first power compensation device 102 to be configured to provide or absorb reactive power to the power supply device 101; and / or, the controller 104 for controlling the second power compensation device 103 to be configured to provide or absorb reactive power and / or active power to the power supply device 101.

[0082] Optionally, the controller 104 can have three modes: a first mode, a second mode, and a third mode, specifically:

[0083] In the first mode, the controller 104 controls the first power compensation device 102 to be configured to provide or absorb reactive power to the power supply device 101, and the controller 104 controls the second power compensation device 103 to be configured only to provide or absorb active power to the power supply device 101, that is, the second power compensation device 103 does not provide or absorb reactive power to the power supply device 101.

[0084] In the second mode, the controller 104 controls the second power compensation device 103 to be configured to provide or absorb active and reactive power to the power supply device 101, while the first power compensation device 102 does not provide or absorb reactive power to the power supply device 101.

[0085] In the third mode, controller 104 controls the first power compensation device 102 to provide or absorb reactive power to the power supply device 101, and controller 104 controls the second power compensation device 103 to provide or absorb both reactive and active power to the power supply device 101. The ratio of reactive power provided by the first power compensation device 102 to reactive power provided by the second power compensation device 103 ranges from 3:1 to 10:1. This means that by reducing the number of second power compensation devices 103, or reducing the proportion of reactive power compensation provided by the second power compensation devices 103, the cost of the energy storage system 100 is reduced while the stability and reliability of the power supply device 101 are improved. Furthermore, the range of the ratio of reactive power provided by the first power compensation device 102 to the second power compensation device 103 can be determined based on the capacity of the energy storage system 100 to further reduce costs while improving the stability and reliability of the power supply device 101.

[0086] It should be understood that the controller 104 can control the first power compensation device 102 or the second power compensation device 103 based on the real-time detected voltage or power value of the power supply device 101. For example, when a voltage drop is detected in the power supply device 101, the controller 104 can control the first power compensation device 102 and / or the second power compensation device 103 to provide reactive power, thereby increasing the voltage of the power supply device 101. When a voltage rise is detected in the power supply device 101, the controller 104 can control the first power compensation device 102 and / or the second power compensation device 103 to absorb reactive power and reduce the voltage. Additionally, the controller 104 can also control based on other empirical values ​​or stored values; this application does not impose any limitations on this.

[0087] It should also be understood that the controller 104 may be an energy management system (EMS). The battery device 110 responds to the scheduling instructions of the power supply device 101 and participates in auxiliary services such as peak shaving, frequency regulation, and voltage support. The EMS is used to dynamically allocate the output of active and / or reactive power of the first power compensation device 102 and / or the second power compensation device 103 to ensure the stability and reliability of the energy storage system 100.

[0088] The controller 104 can communicate with the first power compensation device 102 and the second power compensation device 103 via Ethernet or CAN cable, or via other means. This application does not limit the communication between them.

[0089] It should also be understood that the controller 104 may include a first controller, a second controller and a third controller, wherein the first controller is the overall controller 104, the second controller may be set in the first power compensation device 102 for further controlling the first power compensation device 102 according to the instructions of the first controller, and the third controller may be set in the second power compensation device for further controlling the second power compensation device 103 according to the instructions of the first controller.

[0090] Optionally, the second controller can control the first power compensation device 102 based on the voltage value of the power supply device 101, the reactive power command from the first controller, or the reactive power command obtained from local detection.

[0091] Optionally, the third controller can control the second rate compensation device based on the voltage or power value of the power supply device 101, the reactive power command from the first controller, or the active power command obtained from local detection.

[0092] In this embodiment, the controller 104 controls the first power compensation device 102 to provide or absorb reactive power to the power supply device 101; and / or, the controller 104 controls the second power compensation device 103 to provide or absorb reactive power and / or active power to the power supply device 101. The controller 104 can coordinate the first power compensation device 102 and the second power compensation device 103 to perform active or reactive power compensation, thereby improving the performance of the energy storage system 100 and enhancing the stability of the power grid. Furthermore, the controller 104 can adjust the first power compensation device... The inclusion of the first power compensation device 102 and the second power compensation device 103 can reduce the dependence on the second power compensation device 103, thereby reducing the number of second power compensation devices 103 in the energy storage system 100 and reducing the cost of the energy storage system 100. In addition, both the first power compensation device 102 and the second power compensation device 103 can provide or absorb reactive power to the power supply device 101. That is, in the event of a failure of one device, the controller 104 can control the other device to provide or absorb reactive power to the power supply device 101, which can improve the reliability and stability of the energy storage system 100.

[0093] Figure 4 A schematic diagram of another energy storage system 100 provided in an embodiment of this application is shown.

[0094] Optionally, based on some embodiments of this application, reference may be made to... Figures 2 to 4 As described, the energy storage system 100 further includes: a first sensor 105, one end of which is electrically connected to the interface 120, and the other end of which is electrically connected to the junction of the first power compensation device 102 and the second power compensation device 103. The first sensor 105 is used to detect the voltage value and / or frequency value of the power supply device 101. The controller 104 is used to control the first power compensation device 102 to be configured to provide or absorb reactive power to the power supply device 101 based on the voltage value; and / or, the controller 104 is used to control the second power compensation device 103 to be configured to provide or absorb reactive power and / or active power to the power supply device 101 based on the voltage value and / or frequency value.

[0095] It should be understood that, such as Figure 4 As shown, the junction point where the other end of the first sensor 105 is electrically connected to the junction point of the first power compensation device 102 and the second power compensation device 103 usually refers to the common access point of the first power compensation device 102 and the second power compensation device 103 in electrical connection. This point can be used to undertake functions such as power interaction, power synthesis and system control.

[0096] It should also be understood that one end of the first sensor 105 is electrically connected to the interface 120, that is, one end of the first sensor 105 is connected to the power supply device 101 to detect data information between the power supply device 101 and the junction of the first power compensation device 102 and the second power compensation device 103.

[0097] It should also be understood that the controller 104 is used to control the first power compensation device 102 to provide or absorb reactive power to the power supply device 101 based on the voltage value. Specifically, the first sensor 105 detects the voltage value of the power supply device 101, and the controller 104 is used to generate a voltage deviation based on the voltage value and a reference voltage; and generate a reactive power command based on the voltage deviation. The reactive power command can be generated according to proportional-integral control or other algorithms, and this application does not impose any limitations on this. Next, the controller 104 calculates the reactive power component that the power supply device 101 needs to compensate based on instantaneous reactive power theory. The controller modulator generates an inverter drive signal, thereby controlling the first power compensation device 102 to output reactive power to compensate the power supply device 101.

[0098] It should also be understood that the controller 104 is used to control the second power compensation device 103 to provide or absorb reactive power and / or active power to the power supply device 101 based on the voltage value and / or frequency value. It should be understood that the process by which the second power compensation device 103 provides reactive power can be consistent with the process by which the first power device provides reactive power, or it can be adjusted according to the components of the second power compensation device 103 itself; this application does not impose any limitations on this. Furthermore, the controller 104 is used to control the second power compensation device 103 to provide or absorb active power to the power supply device 101 based on the voltage value and / or frequency value. Specifically, the first sensor 105 is used to acquire the voltage and / or frequency of the power supply device 101. The controller 104 generates a frequency deviation and / or voltage deviation based on the voltage and / or frequency and a reference voltage and / or reference frequency. The controller 104 further generates an active power command based on the frequency deviation and / or voltage deviation. The active power command of the controller 104 controls the inverter of the second power compensation device 103 to output active power to compensate the power supply device 101.

[0099] In this embodiment, a first sensor 105, positioned between the power supply device 101 and the junction of the first power compensation device 102 and the second power compensation device 103, detects the voltage and / or frequency value of the power supply device 101. A controller 104, based on the voltage value, controls the first power compensation device 102 to be configured to provide or absorb reactive power to the power supply device 101, thereby accurately compensating for or absorbing reactive power in the power grid 1011. And / or, the controller 104, based on the voltage and / or frequency value, controls the second power compensation device 103 to be configured to provide or absorb reactive power and / or active power to the power supply device 101. The controller 104 adjusts the settings according to the voltage and / or frequency value, i.e., according to voltage or frequency variations on the power supply device 101 side. 4. The power supply device 101 is compensated for or absorbed by reactive or active power, thereby improving the performance of the energy storage system 100 and enhancing the stability of the power grid 1011. In addition, by adjusting the first power compensation device 102 and the second power compensation device 103 through the controller 104, the dependence on the second power compensation device 103 can be reduced, thereby reducing the number of second power compensation devices 103 in the energy storage system 100 and reducing the cost of the energy storage system 100. Furthermore, both the first power compensation device 102 and the second power compensation device 103 can provide or absorb reactive power to the power supply device 101. That is, in the event of a failure of one device, the controller 104 can control the other device to provide or absorb reactive power to the power supply device 101, thereby improving the reliability and stability of the energy storage system 100.

[0100] Figure 5 A schematic diagram of another energy storage system 100 provided in an embodiment of this application is shown.

[0101] According to some embodiments of this application, optionally, such as Figure 5 As shown, interface 120 is bus 1012. One end of bus 1012 is electrically connected to power supply device 101, and the other end is electrically connected to first power compensation device 102 and second power compensation device 103. Power supply device 101 is used to obtain external power, and bus 1012 is used to distribute external power to first power compensation device 102 and / or second power compensation device 103.

[0102] It should be understood that the power supply device 101 can be a power grid 1011, wherein the power grid 1011 is an energy input for the power interaction hub. When the energy storage system 100 is charging, the power grid 1011 provides electrical energy; when the energy storage system 100 is discharging, it feeds electrical energy to the power grid 1011. It should also be understood that the following embodiments can be described using the power grid 1011 as an example.

[0103] It should also be understood that bus 1012 is the main power distribution channel within the energy storage system 100. Based on voltage levels, it is divided into DC bus 1012 and AC bus 1012. DC bus 1012 sends the DC power from the battery to the PCS for conversion to AC power, or performs reverse charging. AC bus 1012 connects to the PCS, loads, and other devices, distributing AC power. In this embodiment, interface 120 is bus 1012. One end of bus 1012 is electrically connected to the power supply device 101, and the other end is electrically connected to the first power compensation device 102 and the second power compensation device 103. This allows the power supply device 101 to provide power to the first power compensation device 102 and the second power compensation device 103. Furthermore, in the event of instability in the power supply device 101, the first power compensation device 102 and / or the second power compensation device 103 can first provide or absorb active or reactive power to the power supply device 101, thereby improving the stability and reliability of the power supply device 101.

[0104] Figure 6 A schematic diagram of another energy storage system 100 provided in an embodiment of this application is shown.

[0105] According to some embodiments of this application, optionally, such as Figure 6 As shown, the energy storage system 100 further includes: a second sensor 106, one end of which is electrically connected to the bus 1012, and the other end of which is electrically connected to the first power compensation device 102 or the second power compensation device 103, the second sensor 106 being used to detect the current value of the first power compensation device 102 or the second power compensation device 103; a controller 104, which, based on the voltage value and the current value, controls the first power compensation device 102 to be configured to provide or absorb reactive power to the power supply device 101; and / or, the controller 104 is used to, based on the voltage value and the current value; and / or the frequency value, control the second power compensation device 103 to be configured to provide or absorb reactive power and / or active power to the power supply device 101.

[0106] It should be understood that there can be two second sensors 106. One second sensor 106 has one end electrically connected to the bus 1012 and the other end electrically connected to the first power compensation device 102; the other second sensor 106 has one end connected to the bus 1012 and the other end electrically connected to the second power compensation device 103. It should also be understood that there can be multiple second sensors 106. If there are multiple second power compensation devices 103 connected in parallel to the bus 1012, they can be positioned between the multiple second power compensation devices 103 and the bus 1012 to detect current values. It should also be understood that if there are multiple second sensors 106, and if there are multiple first power compensation devices 102 connected in parallel, they can be positioned between the multiple first power compensation devices 102 and the bus 1012 to detect current values.

[0107] In this embodiment, a second sensor 106, disposed between the bus 1012 and the first power compensation device 102 or the second power compensation device 103, detects the current value of the first power compensation device 102 or the second power compensation device 103. A controller 104, based on the voltage and current values, controls the first power compensation device 102 to provide or absorb reactive power to the power supply device 101, thereby accurately compensating for or absorbing reactive power in the power grid 1011. And / or, the controller 104, based on the voltage, current, and / or frequency values, controls the second power compensation device 103 to provide or absorb reactive power and / or active power to the power supply device 101. The controller 104's actions are based on voltage and current values ​​and / or frequency values, i.e., on voltage or frequency variations on the power grid 1011 side. The controller 104 compensates for or absorbs reactive or active power from the power supply device 101, thereby improving the performance of the energy storage system 100 and enhancing the stability of the power grid 1011. Furthermore, by adjusting the first power compensation device 102 and the second power compensation device 103 through the controller 104, the dependence on the second power compensation device 103 can be reduced, thus reducing the number of second power compensation devices 103 in the energy storage system 100 and lowering its cost. Additionally, both the first power compensation device 102 and the second power compensation device 103 can provide or absorb reactive power to the power supply device 101. That is, if one device fails, the controller 104 can control the other device to provide or absorb reactive power to the power supply device 101, thereby improving the reliability and stability of the energy storage system 100.

[0108] Figure 7 A schematic diagram of the structure of a first power compensation device 102 provided in an embodiment of this application is shown.

[0109] According to some embodiments of this application, optionally, such as Figure 7 As shown, the first power compensation device 102 includes a first modulator 1021 and a first inverter 1022; wherein, the first modulator 1021 is used to adjust the current phase of the first inverter 1022 to provide or absorb reactive power to the power supply device 101.

[0110] It should be understood that the first modulator 1021 can also be regarded as a device in the second controller. The first modulator 1021 generates a pulse width modulation signal, which is transmitted to the gate of the inverter's insulated gate bipolar transistor (IGBT) 1023 or metal-oxide-semiconductor field-effect transistor (MOSFET) through an optical fiber or isolated drive circuit, thereby adjusting the current phase of the first inverter 1022 to provide or absorb reactive power to the power supply device 101.

[0111] In this embodiment of the application, the current phase of the first inverter 1022 is adjusted by the first regulator in the first power compensation device 102, thereby providing or absorbing reactive power to the power supply device 101 to improve the stability and reliability of the power grid 1011.

[0112] Optionally, based on some embodiments of this application, reference may continue to be made to... Figure 7 The first inverter 1022 includes one or more IGBTs 1023; wherein, the first modulator 1021 is used to generate switching signals for the IGBTs 1023 to regulate the opening and closing of the IGBTs 1023, thereby regulating the current phase of the first inverter 1022.

[0113] It should be understood that the first inverter 1022 includes one or more insulated gate bipolar transistors (IGBTs) 1023, which may include the following:

[0114] In one scenario, the first inverter 1022 is a two-level inverter, with each phase consisting of two IGBT1023s forming a half-bridge, for a total of six IGBT1023s used in three phases.

[0115] In another scenario, the first inverter 1022 is a three-level inverter, with each phase including four IGBT1023s, forming an "H" bridge and outputting multi-level waveforms.

[0116] It should also be understood that the first modulator 1021 is used to generate switching signals for the IGBT 1023 to regulate the on and off states of the IGBT 1023, thereby adjusting the current phase of the inverter. Specifically, the first modulator 1021 generates precise switching signals for the IGBT 1023, thereby controlling the on and off states of the IGBT 1023, thus adjusting the phase and amplitude of the output current of the first inverter 1022, ultimately achieving reactive power output.

[0117] In this embodiment, the first modulator 1021 is used to generate a switching signal for the IGBT 1023 to regulate the opening and closing of the IGBT 1023, thereby regulating the current phase of the first inverter 1022, and thus providing or absorbing reactive power to the power supply device 101 to improve the stability and reliability of the power grid 1011.

[0118] Figure 8 A schematic diagram of the structure of another energy storage system 100 provided in an embodiment of this application is shown.

[0119] According to some embodiments of this application, optionally, such as Figure 8 As shown, the first power compensation device 102 also includes a support capacitor 1025 and a filter 1024. The DC side of the first inverter 1022 is electrically connected to the support capacitor 1025, the AC side of the first inverter 1022 is electrically connected to the filter 1024, and the filter 1024 is electrically connected to the power supply device 101.

[0120] It should be understood that the DC side of the first inverter 1022 is connected to a support capacitor 1025 to provide a stable DC voltage. The output of the first inverter 1022 is connected to the power grid 1011 to suppress harmonics and achieve energy exchange.

[0121] In this embodiment, the first power compensation device 102 needs to quickly absorb or release energy when compensating for reactive power. The support capacitor 1025 can smooth out instantaneous voltage fluctuations on the DC bus 1012. Additionally, in the event of a sudden voltage drop or short circuit on the grid 1011, the support capacitor 1025 provides short-term energy support, preventing damage to the first power compensation device 102 caused by the sudden voltage drop on the DC side. The filter 1024 can efficiently suppress high-order harmonics, ensuring the output current meets the grid 1011 standard. Furthermore, the filter 1024 can limit the inverter output to reduce stress on the IGBT 1023, extending its service life and thus extending the service life of the first power compensation device 102.

[0122] Optionally, based on some embodiments of this application, reference may continue to be made to... Figure 7 and Figure 8 The first power compensation device 102 is a static var generator (SVG).

[0123] The SVG has a response speed of up to 3ms, enabling it to quickly provide reactive power to the grid 1011 for compensation and improved grid stability. Furthermore, the SVG can output capacitive or inductive reactive power without step-by-step adjustment. The SVG's output current THD is less than 3%. It can accurately compensate for reactive power, further improving grid stability. Additionally, when the number of second power compensation devices 103 is large, circulating current and oscillation issues between devices are difficult to avoid. Increasing the number of SVGs can reduce these problems.

[0124] It should be understood that, in the embodiments of this application, the description of improving the stability of the power grid is consistent with improving the stability of the power supply device.

[0125] In this embodiment, the SVG can respond quickly and dynamically, making it suitable for frequently fluctuating reactive power demands. Furthermore, the SVG can accurately output capacitive or inductive reactive power, maintaining voltage stability. Additionally, the SVG can focus on reactive power, reducing reliance on the second power compensation device 103, thereby reducing the number of second power compensation devices 103 in the energy storage system 100 and lowering its cost. In some embodiments, the second power compensation device 103 includes a bidirectional converter 1031; wherein, when the battery device 110 is configured in a charging / discharging state, the bidirectional converter 1031 is used for energy conversion between the battery device 110 and the power supply device 101 to provide or absorb reactive power and / or active power to the power supply device 101.

[0126] Figure 9 A schematic diagram of the structure of a second power compensation device 103 provided in an embodiment of this application is shown.

[0127] According to some embodiments of this application, optionally, such as Figure 9 As shown, the bidirectional converter 1031 in the second power compensation device 103 is used for energy conversion between the battery device 110 and the power supply device 101, so as to provide or absorb reactive power and / or active power to the power supply device 101, thereby realizing efficient and flexible energy interaction between the battery device 110 and the power grid 1011, thereby improving the stability of the power grid 1011.

[0128] It should be understood that the second power compensation device 103 can be a PCS, wherein the PCS includes a bidirectional converter 1031, which can be a second inverter. The second inverter 1033 is controlled by a third controller to output active current, thereby generating active power to compensate the grid 1011 for active power.

[0129] Figure 10A schematic diagram of another second power compensation device 103 provided in an embodiment of this application is shown.

[0130] Optionally, based on some embodiments of this application, reference may be made to... Figure 9 and Figure 10 The second power compensation device 103 includes a second modulator 1032 and a second inverter 1033; wherein the second modulator 1032 is used to adjust the current phase of the second inverter 1033 to provide or absorb reactive power to the power supply device 101.

[0131] The second modulator 1032 can be the third controller described in the above embodiments, used to adjust and control the current phase of the second inverter 1033.

[0132] In this embodiment of the application, the current phase of the second inverter 1033 is adjusted by the second regulator in the second power compensation device 103, thereby providing or absorbing reactive power to the power supply device 101 to improve the stability and reliability of the power grid 1011.

[0133] Figure 11 A schematic diagram of another energy storage system 100 provided in an embodiment of this application is shown.

[0134] According to some embodiments of this application, optionally, such as Figure 11 As shown, the second power compensation device 103 includes a plurality of first sub-power compensation devices 1034, which are connected in parallel; the first sub-power compensation devices 1034 include a plurality of second sub-power compensation devices 1035, which are connected in series.

[0135] In this embodiment, multiple first sub-power compensation devices 1034 are connected in parallel, and the total output power is the sum of the output power of each first sub-power compensation device 1034, meeting the high-capacity requirements. Furthermore, in the event of a failure of a single first sub-power compensation device 1034, the other first sub-power compensation devices 1034 can continue to operate, improving the stability of the energy storage system 100. Additionally, multiple second sub-power compensation devices 1035 are connected in series, adapting to different grid voltage levels to flexibly address various scenarios with different grid voltage levels.

[0136] According to some embodiments of this application, this application also provides an electrical device including an energy storage system 100 according to any of the above embodiments, the energy storage system 100 being used to store or provide electrical energy.

[0137] According to some embodiments of this application, see Figures 2 to 11This application provides an energy storage system 100, including an interface 120, a first power compensation device 102, and a second power compensation device 103. The interface 120 is electrically connected to an external power supply device 101. One end of the first power compensation device 102 is electrically connected to the interface 120. One end of the second power compensation device 103 is electrically connected to the interface 120, and the other end is electrically connected to a battery device 110. The first power compensation device 102 is configured to provide or absorb reactive power to the power supply device 101, and the second power compensation device 103 is configured to provide or absorb reactive power and / or active power to the power supply device 101. By configuring the first power compensation device 102 to provide or absorb reactive power to the power supply device 101, and configuring the second power compensation device 103 to provide or absorb reactive power and / or active power to the power supply device 101, on the one hand, by adding the first power compensation device 102 for reactive power compensation or absorption, the dependence on the second power compensation device 103 can be reduced, thereby reducing the number of second power compensation devices 103 in the energy storage system 100 and reducing the cost of the energy storage system 100; on the other hand, both the first power compensation device 102 and the second power compensation device 103 can provide or absorb reactive power to the power supply device 101, that is, in the event of a failure of one device, reactive power can be provided or absorbed to the power supply device 101 through the other device, thereby improving the reliability and stability of the energy storage system 100.

[0138] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not 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. These 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, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An energy storage system, characterized in that, include: Interface (120) is electrically connected to an external power supply device (101); The first power compensation device (102) is electrically connected at one end to the interface (120); The second power compensation device (103) is electrically connected at one end to the interface (120) and at the other end to the battery device (110); The first power compensation device (102) is configured to provide or absorb reactive power to the power supply device (101), and the second power compensation device (103) is configured to provide or absorb the reactive power and / or active power to the power supply device (101).

2. The energy storage system according to claim 1, characterized in that, The energy storage system also includes: A controller (104) is configured to control the first power compensation device (102) to provide or absorb the reactive power to the power supply device (101); and / or, The controller (104) is used to control the second power compensation device (103) to be configured to provide or absorb the reactive power and / or active power to the power supply device (101).

3. The energy storage system according to claim 2, characterized in that, The energy storage system also includes: The first sensor (105) is electrically connected at one end to the interface (120) and at the other end to the junction of the first power compensation device (102) and the second power compensation device (103). The first sensor (105) is used to detect the voltage value and / or frequency value of the power supply device (101). The controller (104) is configured to, based on the voltage value, control the first power compensation device (102) to provide or absorb the reactive power to the power supply device (101); and / or, The controller (104) is configured to control the second power compensation device (103) to provide or absorb the reactive power and / or the active power to the power supply device (101) based on the voltage value and / or the frequency value.

4. The energy storage system according to claim 3, characterized in that, The interface (120) is a bus (1012), one end of which is electrically connected to the power supply device (101), and the other end is electrically connected to the first power compensation device (102) and the second power compensation device (103); The power supply device (101) is used to obtain external power, and the bus (1012) is used to distribute the external power to the first power compensation device (102) and / or the second power compensation device (103).

5. The energy storage system according to claim 4, characterized in that, The energy storage system also includes: The second sensor (106) is electrically connected at one end to the bus (1012) and at the other end to the first power compensation device (102) or the second power compensation device (103). The second sensor (106) is used to detect the current value of the first power compensation device (102) or the second power compensation device (103). The controller (104), based on the voltage value and the current value, controls the first power compensation device (102) to be configured to provide or absorb the reactive power to the power supply device (101); and / or, The controller (104) is configured to control the second power compensation device (103) to provide or absorb the reactive power and / or the active power to the power supply device (101) based on the voltage value and the current value; and / or the frequency value.

6. The energy storage system according to claim 1, characterized in that, The first power compensation device (102) includes a first modulator (1021) and a first inverter (1022); The first modulator (1021) is used to adjust the current phase of the first inverter (1022) to provide or absorb the reactive power to the power supply device (101).

7. The energy storage system according to claim 6, characterized in that, The first power compensation device (102) further includes a support capacitor (1025) and a filter (1024). The DC side of the first inverter (1022) is electrically connected to the support capacitor (1025), and the AC side of the first inverter (1022) is electrically connected to the filter (1024). The filter (1024) is electrically connected to the power supply device (101).

8. The energy storage system according to any one of claims 1 to 7, characterized in that, The second power compensation device (103) includes a bidirectional converter (1031); When the battery device (110) is configured to charge and discharge, the bidirectional converter (1031) is used for energy conversion between the battery device (110) and the power supply device (101) to provide or absorb the reactive power and / or the active power to the power supply device (101).

9. The energy storage system according to claim 8, characterized in that, The second power compensation device (103) further includes a second modulator (1032) and a second inverter (1033); The second modulator (1032) is used to adjust the current phase of the second inverter (1033) to provide or absorb the reactive power to the power supply device (101).

10. The energy storage system according to any one of claims 1 to 7, characterized in that, The second power compensation device (103) includes a plurality of first sub-power compensation devices (1034), which are connected in parallel. The first sub-power compensation device (1034) includes a plurality of second sub-power compensation devices (1035), which are connected in series.

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