Test system for energy storage devices and energy storage system

Abstract

The embodiment of the application provides a kind of energy storage device test system and energy storage system, comprising: power supply device is used to output first alternating current;Simulation device is electrically connected with power supply device, to receive first alternating current, simulation device is configured to simulate at least two power generation modes, power generation mode includes thermal power generation, hydroelectric power generation, diesel power generation and wind power generation;Interface device one side is electrically connected with simulation device, the other side is electrically connected with the energy storage equipment to be measured, and interface device is used to simulate the exchange of electrical energy between simulation device and the energy storage equipment to be measured;Wherein, simulation device includes first simulation power generation system, and the output of first simulation power generation system is three-phase power.It can realize the simulation of multiple power generation modes to improve the flexibility and scene adaptability of test system.

Description

Technical Field

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

[0002] Against the backdrop of increased global support for the development of new energy technologies, various energy storage-related technologies have been widely applied. To meet the demands of large-capacity energy storage devices, numerous tests are required. Therefore, how to effectively test energy storage devices is an urgent problem to be solved. Utility Model Content

[0003] This application provides a test system and an energy storage system for an energy storage device, which can simulate multiple power generation modes to improve the flexibility and adaptability of the test system to different scenarios.

[0004] In a first aspect, a test system for an energy storage device is provided, comprising: a power supply device for outputting a first alternating current; a simulation device electrically connected to the power supply device to receive the first alternating current, the simulation device being configured to simulate at least two power generation modes, including thermal power generation, hydropower generation, diesel power generation, and wind power generation; and an interface device, one side electrically connected to the simulation device and the other side electrically connected to the energy storage device under test, the interface device being used for power exchange between the simulation device and the energy storage device under test; wherein the simulation device includes a first simulated power generation system, the output of the first simulated power generation system being three-phase power.

[0005] In this embodiment, the simulation device is configured to simulate at least two power generation modes, adapting to the needs of different types of energy storage devices under test. This flexibility enables the test system to cover a variety of application scenarios, thereby improving the system's flexibility and adaptability. Furthermore, the simulation device can simulate multiple power generation modes, allowing the test system to coordinate the power generation characteristics of different power sources and optimize the power system's operating efficiency.

[0006] In some embodiments, the simulation device is further configured to simulate a first power generation mode and a second power generation mode, and the test system further includes a controller that controls the simulation device to simulate the first power generation mode in a first time period and to simulate the second power generation mode in a second time period.

[0007] In this embodiment of the application, when the switching device controls the switching to the first simulated power generation system, the controller controls the simulation device to simulate the first power generation mode in the first time period and the second power generation mode in the second time period. By using time multiplexing, the switching test of multiple modes is carried out to improve the flexibility and scenario adaptability of the test system. In addition, by realizing multiple power generation modes, the test system can coordinate the power generation characteristics of different power supply devices and optimize the operating efficiency of the power system.

[0008] In some embodiments, the simulation device further includes a second simulated power generation system, the output of which is two-phase electricity.

[0009] In this embodiment, the output of the second simulation system in the simulation device is two-phase electricity, meaning the simulation device can simulate wind power generation. The multiple power generation modes in the test system of this embodiment improve the flexibility and adaptability of the test system. Furthermore, the simulation device can simulate multiple power generation modes, and the test system can coordinate the power generation characteristics of different power sources, optimizing the operating efficiency of the power system.

[0010] In some embodiments, the simulation device includes: a switching device, one end of which is electrically connected to a first simulated power generation system and / or a second simulated power generation system, and the other end of which is connected to an interface device. The switching device is used to control the electrical connection between the first simulated power generation system and / or the second simulated power generation system and the interface device.

[0011] In this embodiment, during testing, the switching device can dynamically switch power generation modes, reducing the adjustment time of the test equipment and improving testing efficiency. Furthermore, switching between the first and second simulated power generation systems via the switching device enhances the flexibility and adaptability of the test system. Moreover, by implementing multiple power generation modes, the test system can coordinate the power generation characteristics of different power sources, optimizing the operating efficiency of the power system.

[0012] In some embodiments, the first simulated power generation system includes: a first synchronous power generation branch, one end of which is electrically connected to a power supply device and the other end of which is electrically connected to a switching device; the switching device includes a first switching device, which closes when the simulation device is configured as the first simulated power generation system, so that the first synchronous power generation branch is connected to the interface device.

[0013] In this embodiment of the application, in the first simulated power generation system with three-phase power output, the first switching device can realize multiple power generation modes of the first simulated power generation system to improve the flexibility and scenario adaptability of the test system. In addition, by realizing multiple power generation modes, the test system can coordinate the power generation characteristics of different power supply devices and optimize the operating efficiency of the power system.

[0014] In some embodiments, the second simulated power generation system includes: a second synchronous power generation branch, one end of which is electrically connected to a power supply device and the other end of which is electrically connected to a switching device; the switching device includes a second switching device, which closes when the simulation device is configured as the second simulated power generation system, so that the second synchronous power generation branch is connected to the interface device.

[0015] In the embodiments of this application, in the second simulated power generation system with two-phase power output, the second switching device can realize multiple power generation modes of the second simulated power generation system to improve the flexibility and scenario adaptability of the test system. In addition, by realizing multiple power generation modes, the test system can coordinate the power generation characteristics of different power supply devices and optimize the operating efficiency of the power system.

[0016] In some embodiments, the switching device includes three first switching devices, and the number of first synchronous power generation branches is three. Each of the three first switching devices is electrically connected to the output of the corresponding first synchronous power generation branch among the three first synchronous power generation branches. The switching device also includes two second switching devices, and the number of second synchronous power generation branches is two. The two second switching devices are electrically connected to the outputs of the two second synchronous power generation branches respectively.

[0017] In this embodiment, when there are three first synchronous power generation branches, they are connected by three first switching devices to form a three-phase power output, which can simulate more power generation modes and improve the flexibility and scenario adaptability of the test system. Alternatively, when two second switching devices are connected to two second synchronous power generation branches, a two-phase power output can be formed to simulate wind power generation, further improving the flexibility and scenario adaptability of the test system.

[0018] In some embodiments, the simulation device is further configured to simulate a third power generation mode, and the controller is further configured to control the three synchronous power generation branches or any two of the three synchronous power generation branches to be configured to simulate the third power generation mode at the same time.

[0019] In the embodiments of this application, when there are three synchronous power generation branches, when three-phase or two-phase power is connected to the grid, the controller controls the three synchronous power generation branches or any two of the three synchronous power generation branches to be configured as a simulated third power generation mode at the same time. This can realize the rapid grid connection output of two-phase or three-phase power to form multiple power generation modes, thereby improving the flexibility and scenario adaptability of the test system.

[0020] In some embodiments, the second analog power generation system includes: a first frequency converter, one end of which is electrically connected to a second switching device, and the other end of which is connected to an interface device.

[0021] In this embodiment of the application, the first frequency converter in the second simulated power generation system can simulate the operating state of the wind turbine power generation mode under different frequency and other conditions, making the simulation process of the simulation device more accurate.

[0022] In some embodiments, the first synchronous power generation branch and / or the second synchronous power generation branch include: a step-down transformer, one end of which is electrically connected to a power supply device for converting a first AC power into a second AC power; a second frequency converter, one end of which is electrically connected to the step-down transformer for adjusting the frequency characteristic parameters of the second AC power and outputting a third AC power; an asynchronous motor, one end of which is electrically connected to the second frequency converter for converting electrical energy into mechanical energy based on the third AC power; and a synchronous motor, one end of which is electrically connected to the asynchronous motor and the other end of which is electrically connected to a switching device for outputting a fourth AC power based on the mechanical energy.

[0023] In this embodiment, the conversion of electrical energy, mechanical energy, and electrical energy is achieved through a step-down transformer, a second frequency converter, an asynchronous motor, and a synchronous motor, replacing other conversions from chemical energy to electrical energy, thereby simulating multiple power generation modes and improving the flexibility and adaptability of the testing system.

[0024] In some embodiments, the second frequency converter includes: a generator model for simulating at least one power generation mode, including thermal power generation, hydropower generation, diesel power generation, and wind power generation.

[0025] In this embodiment of the application, a generator model is set in the first frequency converter to simulate multiple power generation modes, thereby improving the flexibility and scenario adaptability of the test system. In addition, the generator model can accurately simulate multiple power generation modes, providing reliable data for power grid stability research.

[0026] In some embodiments, at least two of the synchronous motors in the three first synchronous power generation branches have different capacities.

[0027] In the embodiments of this application, the flexibility of the testing system can be improved and the research needs of different power grid scenarios can be met by using synchronous motors of different capacities.

[0028] In some embodiments, the test system further includes: a step-up transformer, one end of which is electrically connected to a switching device and the other end of which is electrically connected to an interface device; wherein the input of the step-up transformer is three-phase or two-phase power.

[0029] In this embodiment, a step-up transformer is used to output high-voltage electricity from low-voltage three-phase or two-phase electricity, which is matched with the voltage of the power supply device to conduct more accurate testing of the energy storage device under test.

[0030] In some embodiments, the test system further includes a load simulation device, one end of which is electrically connected to a power supply device and the other end of which is electrically connected to an interface device.

[0031] In this embodiment of the application, a load simulation device is used to test the test system in order to improve the stability and reliability of the entire test system.

[0032] In a second aspect, an energy storage system is provided, including an energy storage device under test and a test system as described in any of the first aspects, the test system being used to test the energy storage device under test. Attached Figure Description

[0033] Figure 1 A flowchart of a test system provided in an embodiment of this application is shown.

[0034] Figure 2 A flowchart of a test system provided in another embodiment of this application is shown.

[0035] Figure 3 A flowchart of a test system provided in another embodiment of this application is shown.

[0036] Figure 4 A flowchart of a test system provided in another embodiment of this application is shown.

[0037] Figure 5 A flowchart of a test system provided in another embodiment of this application is shown.

[0038] Figure 6 A flowchart of a test system provided in another embodiment of this application is shown.

[0039] Figure 7 A flowchart of a test system provided in another embodiment of this application is shown.

[0040] Figure 8 A schematic diagram of the first synchronous power generation branch provided in an embodiment of this application is shown.

[0041] Figure 9 A flowchart of a test system provided in another embodiment of this application is shown.

[0042] Figure 10 A flowchart of a test system provided in another embodiment of this application is shown.

[0043] Reference numerals: 10-Test system; 110-Power supply device; 120-Simulation device; 1201-First simulated power generation system; 1202-Second simulated power generation system; 1203-Switching device; 12031-First switching device; 12032-Second switching device; 1204-First synchronous power generation branch; 1205-Second synchronous power generation branch; 12041-Step-down transformer; 12042-Second frequency converter; 12043-Asynchronous motor; 12044-Synchronous motor; 1207-First frequency converter; 130-Interface device; 140-Energy storage device under test; 150-Controller; 160-Step-up transformer; 180-Load simulation device. Detailed Implementation

[0044] 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.

[0045] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the 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.

[0046] 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.

[0047] 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.

[0048] In this application, "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0049] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0050] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0051] 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.

[0052] 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 connected in series, parallel, or mixed connections via a busbar.

[0053] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use individual battery cells, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0062] 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.

[0063] 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.

[0064] In some embodiments, the energy storage device is an energy storage container or an energy storage cabinet.

[0065] In some embodiments, the energy storage device may include a cabinet and one or more battery clusters housed within the cabinet.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] As an example, the power distribution unit can be used to distribute power to the power modules of the energy storage device.

[0072] 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.

[0073] Currently, various dynamic model testing platforms typically simulate only one generator mode. Even during the process of an asynchronous motor driving a synchronous motor for grid-connected power generation, only one generator mode can be simulated. This limited simulation restricts its application in various power grid scenarios. Furthermore, these dynamic model testing platforms generally cannot switch between wind power generation and other power generation modes, failing to meet the research needs of new power grid architectures.

[0074] To address the issue that various dynamic model test platforms cannot simulate multiple power generation modes, a simulation device can be added to the dynamic model test platform. Through three-phase power output, simulation in multiple modes can be achieved, thereby improving the flexibility and scenario adaptability of the test system.

[0075] Based on the above considerations, to address the limitations of dynamic model testing platforms in achieving flexibility and scenario adaptability, this application provides a testing system for energy storage devices, comprising: a power supply unit outputting first alternating current; a simulation unit electrically connected to the power supply unit to receive the first alternating current, the simulation unit being configured to simulate at least two power generation modes, including thermal power generation, hydropower generation, diesel power generation, and wind power generation; and an interface unit electrically connected on one side to the simulation unit and on the other side to the energy storage device under test, the interface unit being used for power exchange between the simulation unit and the energy storage device under test; wherein, the simulation unit includes a first simulated power generation system, the output of which is three-phase power. In this embodiment, the simulation unit is configured to simulate at least two power generation modes, enabling it to adapt to the needs of different types of energy storage devices under test. This flexibility allows the testing system to cover multiple application scenarios, thereby improving the flexibility and scenario adaptability of the testing system. Furthermore, the simulation unit can simulate multiple power generation modes, allowing the testing system to coordinate the power generation characteristics of different power supply units and optimize the operating efficiency of the power system.

[0076] Figure 1 A flowchart of a test system 10 provided in an embodiment of this application is shown.

[0077] This application provides a test system 10 for an energy storage device, which can simulate multiple power generation modes to improve the flexibility and adaptability of the test system 10.

[0078] According to some embodiments of this application, refer to Figure 2 This application provides a test system 10 for an energy storage device, including a power supply device 110, a simulation device 120, and an interface device 130. The power supply device 110 is used to output a first alternating current. The simulation device 120 is electrically connected to the power supply device 110 to receive the first alternating current. The simulation device 120 is configured to simulate at least two power generation modes, including thermal power generation, hydropower generation, diesel power generation, and wind power generation. The interface device 130 is electrically connected to the simulation device 120 on one side and to the energy storage device under test 140 on the other side. The interface device 130 is used for power exchange between the simulation device 120 and the energy storage device under test 140. The simulation device 120 includes a first simulated power generation system 1201, and the output of the first simulated power generation system 1201 is three-phase power.

[0079] The power supply device 110 can be a power grid for providing alternating current, or it can be other forms of devices that can provide alternating current; this application does not limit it in any way.

[0080] It should be understood that the simulation device 120 is configured to simulate at least two power generation modes in different time periods. For example, it simulates one of the at least two power generation modes in a first time period and another of the at least two power generation modes in a second time period. Through time multiplexing, the switching of multiple power generation modes is realized, and the test system 10 can ultimately realize multiple power generation modes.

[0081] It should also be understood that the first time period and the second time period can be periodic time periods, that is, the switching between the first time period and the second time period is carried out within the periodic time period. The first time period and the second time period can also be any two different time periods. This application does not impose any restrictions on this.

[0082] Optionally, the simulation device 120 may include multiple simulation units, which can be used to simulate various power generation modes. For example, the simulation device 120 includes two simulation units, which can simulate thermal power generation mode and hydropower generation mode respectively. The controller 150 controls the switching between them in different time periods to achieve multiple power generation modes.

[0083] It should also be understood that the interface device 130 can be an experimental bus with the same voltage as the power supply device 110, used to connect the energy storage device 140 under test, such as some new energy testing equipment, or energy storage test specimens, or load simulation device 180, etc.

[0084] It should also be understood that the output of the first simulated power generation system 1201 is three-phase electricity, that is, the final three-phase electricity is connected to the grid to realize one of the simulated power generation methods of thermal power generation, hydropower generation, and diesel power generation.

[0085] In this embodiment, the simulation device 120 is configured to simulate at least two power generation modes, enabling it to adapt to the needs of different types of energy storage devices 140 under test. This flexibility allows the test system 10 to cover a variety of application scenarios, thereby improving the flexibility and scenario adaptability of the test system 10. Furthermore, the simulation device 120 can simulate multiple power generation modes, allowing the test system 10 to coordinate the power generation characteristics of different power supply devices 110 and optimize the operating efficiency of the power system.

[0086] Figure 2 A flowchart of a test system 10 provided in another embodiment of this application is shown.

[0087] According to some embodiments of this application, optionally, such as Figure 2 As shown, the simulation device 120 also includes a second simulation power generation system 1202, the output of which is two-phase electricity.

[0088] It should be understood that the output of the second simulated power generation system 1202 is two-phase electricity, that is, the final two-phase electricity is connected to the grid to realize the simulated wind power generation mode. Through the first simulated power generation system 1201 and the second simulated power generation system 1202, multiple power generation modes such as thermal power generation, hydropower generation, diesel power generation and wind power generation can be realized.

[0089] In this embodiment, the output of the second simulated power generation system 1202 in the simulation device 120 is two-phase electricity, meaning the simulation device 120 can simulate wind power generation. The multiple power generation modes in the test system 10 in this embodiment improve the flexibility and adaptability of the test system 10. Furthermore, the simulation device 120 can simulate multiple power generation modes, and the test system 10 can coordinate the power generation characteristics of different power supply devices 110, optimizing the operating efficiency of the power system.

[0090] Figure 3 A flowchart of a test system 10 provided in another embodiment of this application is shown.

[0091] According to some embodiments of this application, optionally, such as Figure 3 As shown, the simulation device 120 includes: a switching device 1203, one end of which is electrically connected to the first simulation power generation system 1201 and / or the second simulation power generation system 1202, and the other end of which is connected to the interface device 130. The switching device 1203 is used to control the connection between the first simulation power generation system 1201 and / or the second simulation power generation system 1202 and the interface device 130.

[0092] It should be understood that the switching device 1203 is used to control the connection between the first simulated power generation system 1201 or the second simulated power generation system 1202 and the interface device 130. Alternatively, it can be described as switching between the first simulated power generation system 1201 and the second simulated power generation system 1202 via the switching device 1203. Furthermore, when switched to the first simulated power generation system 1201, it can simulate any one of the following power generation modes: thermal power generation, hydropower generation, and diesel power generation. When switched to the second simulated power generation system 1202, it can simulate wind power generation.

[0093] The switching device 1203 can be a switch or a relay, etc., and this application does not limit it in any way.

[0094] In this embodiment, during testing, the switching device 1203 can dynamically switch power generation modes, reducing the adjustment time of the test system 10 and improving testing efficiency. Furthermore, switching between the first simulated power generation system 1201 and the second simulated power generation system 1202 via the switching device 1203 can improve the flexibility and scenario adaptability of the test system 10. Moreover, by implementing multiple power generation modes, the test system 10 can coordinate the power generation characteristics of different power supply devices 110, optimizing the operating efficiency of the power system.

[0095] Figure 4 A flowchart of a test system 10 provided in another embodiment of this application is shown.

[0096] According to some embodiments of this application, optionally, such as Figure 4 As shown, the first simulated power generation system 1201 includes: a first synchronous power generation branch 1204, one end of which is electrically connected to the power supply device 110, and the other end of which is electrically connected to the switching device 1203; the switching device 1203 includes a first switching device 12031, when the simulation device 120 is configured as the first simulated power generation system 1201, the first switching device 12031 is closed so that the first synchronous power generation branch 1204 is connected to the interface device 130.

[0097] It should be understood that the number of first synchronous power generation branches 1204 can be one or more.

[0098] In one possible implementation, the number of first synchronous power generation branches 1204 is one. In this case, the simulation device 120 may include multiple simulation units, which simulate multiple power generation modes respectively. The controller 150 simulates any one of the multiple power generation modes at different times. In this case, the output of the first synchronous power generation branch 1204 is three-phase electricity, which can also be described as the output of the first simulated power generation system 1201 being three-phase electricity.

[0099] In one possible implementation, the number of first synchronous power generation branches 1204 may be multiple. In this case, the simulation device 120 may include multiple simulation units or a single simulation unit. For example, the simulation device 120 corresponding to one first synchronous power generation branch 1204 may include one simulation unit, thereby enabling multiple power generation modes to be realized through multiple synchronous power generation branches 1204. Specifically, for example, with three first synchronous power generation branches 1204, the corresponding three simulation units can simulate one power generation mode. Each first synchronous power generation branch 1204 is three-phase, and the phases are ultimately combined to form a three-phase power output. For example, the three-phase power outputs of the first sub-synchronous power generation branch 1204 in the three first synchronous power generation branches 1204 are A1 phase, B1 phase and C1 phase respectively; the three-phase power outputs of the second sub-synchronous power generation branch 1204 are A2 phase, B2 phase and C2 phase respectively; and the three-phase power outputs of the third sub-synchronous power generation branch 1204 are A3 phase, B3 phase and C3 phase respectively. The final merging process is that A1, A2 and A3 are merged to form phase A, B1, B2 and B3 are merged to form phase B, and C1, C2 and C3 are merged to form phase C. Finally, the first simulated power generation system 1201 outputs three-phase power.

[0100] In this embodiment of the application, in the first simulated power generation system 1201 with three-phase power output, the first switching device 12031 can realize multiple power generation modes of the first simulated power generation system 1201 to improve the flexibility and scenario adaptability of the test system 10. In addition, by realizing multiple power generation modes, the test system 10 can coordinate the power generation characteristics of different power supply devices 110 and optimize the operating efficiency of the power system.

[0101] Figure 5 A flowchart of a test system 10 provided in another embodiment of this application is shown.

[0102] According to some embodiments of this application, optionally, such as Figure 5 As shown, the simulation device 120 is also configured to simulate a first power generation mode and a second power generation mode. The test system 10 also includes a controller 150, which controls the simulation device 120 to simulate the first power generation mode in a first time period and to simulate the second power generation mode in a second time period.

[0103] It should be understood that the controller 150 can be directly electrically connected to the test system 10, or it can be electrically connected in other ways, and this application does not limit it in any way.

[0104] It should also be understood that the first time period and the second time period are different.

[0105] It should also be understood that when the first synchronous power generation branch 1204 in the simulation device 120 includes one, and when the simulation unit in the simulation device 120 includes multiple, multiple power generation modes can be switched in different time periods to achieve more efficient mode switching.

[0106] In this embodiment of the application, when the switching device 1203 controls the switching to the first simulated power generation system 1201, the controller 150 controls the simulation device 120 to simulate the first power generation mode in the first time period and the second power generation mode in the second time period. By using time multiplexing, the switching test of multiple modes is carried out to improve the flexibility and scenario adaptability of the test system 10. In addition, by realizing multiple power generation modes, the test system 10 can coordinate the power generation characteristics of different power supply devices 110 and optimize the operating efficiency of the power system.

[0107] Figure 6 A flowchart of a test system 10 provided in another embodiment of this application is shown.

[0108] According to some embodiments of this application, optionally, such as Figure 6 As shown, the second simulated power generation system 1202 includes: a second synchronous power generation branch 1205, one end of which is electrically connected to the power supply device 110, and the other end of which is electrically connected to the switching device 1203; the switching device 1203 includes a first switching device 12031 and a second switching device 12032. When the simulation device 120 is configured as the second simulated power generation system 1202, the second switching device 12032 is closed so that the second synchronous power generation branch 1205 is connected to the interface device 130.

[0109] It should be understood that the number of second synchronous power generation branches 1205 can be one or more.

[0110] In one possible implementation, the number of second synchronous power generation branches 1205 is one. In this case, the simulation device 120 may include multiple simulation units, each simulating multiple power generation modes. The controller 150 simulates any one of these multiple power generation modes at different times. In this case, the output of the second synchronous power generation branch 1205 is three-phase electricity, and one phase can be connected to the neutral line after load balancing. Ultimately, the output of the second simulated power generation system 1202 is two-phase electricity.

[0111] One possible implementation is to have multiple second synchronous power generation branches 1205. In this case, the simulation device 120 may include multiple simulation units or a single simulation unit. For example, the simulation device 120 corresponding to one second synchronous power generation branch 1205 may include one simulation unit, thus enabling multiple power generation modes through multiple synchronous power generation branches 1204. Specifically, for example, with three second synchronous power generation branches 1205, the corresponding three simulation units can each simulate a power generation mode. Each second synchronous power generation branch 1205 is three-phase. By connecting one phase to the neutral line after load balancing, the phases are ultimately combined to form a two-phase power output.

[0112] It should be understood that the first synchronous power generation branch 1204 and the second synchronous power generation branch 1205 can overlap with each other. For example, the first synchronous power generation branch 1204 has three branches, and these three branches can also serve as the second synchronous power generation branch 1205.

[0113] In this embodiment of the application, in the second simulated power generation system 1202 with two-phase power output, the second switching device 12032 can realize multiple power generation modes of the second simulated power generation system 1202 to improve the flexibility and scenario adaptability of the test system 10. In addition, by realizing multiple power generation modes, the test system 10 can coordinate the power generation characteristics of different power supply devices 110 and optimize the operating efficiency of the power system.

[0114] According to some embodiments of this application, optionally, the switching device 1203 includes three first switching devices 12031, and the number of first synchronous power generation branches 1204 is three. Each of the three first switching devices 12031 is electrically connected to the output of the corresponding synchronous power generation branch 1204 among the three first synchronous power generation branches 1204. The switching device 1203 also includes two second switching devices 12032, and the number of second synchronous power generation branches 1205 is two. The two second switching devices 12032 are electrically connected to the output of the two second synchronous power generation branches 1205.

[0115] Specifically, the first synchronous power generation branch 1204 has three corresponding simulation devices 120 that can simulate multiple power generation modes. The second synchronous power generation branch 1205 also has a corresponding simulation device 120 that can simulate multiple power generation modes, and these multiple power generation modes switch between different time periods. The second synchronous power generation branch 1205 has two corresponding simulation devices 120 that can simulate one power generation mode. At the same time, the power generation modes corresponding to the two second synchronous power generation branches 1205 can realize at least one power generation mode.

[0116] In this embodiment, when there are three first synchronous power generation branches 1204, they are connected by three first switching devices 12031 to form a three-phase power output, which can simulate more power generation modes and improve the flexibility and scenario adaptability of the test system 10. Alternatively, when two second switching devices 12032 are connected to two second synchronous power generation branches 1205, a two-phase power output can be formed to simulate wind power generation mode, further improving the flexibility and scenario adaptability of the test system 10.

[0117] Optionally, based on some embodiments of this application, reference may be made to... Figure 5 The simulation device 120 is also configured to simulate a third power generation mode. The controller 150 controls three first synchronous power generation branches 1204 or two second synchronous power generation branches 1205 to be configured to simulate the third power generation mode at the same time.

[0118] It should be understood that the controller 150 controls three first synchronous power generation branches 1204 or two second synchronous power generation branches 1205 to be configured to simulate a third power generation mode at the same time. That is, the simulation device 120 corresponding to any one of the three first synchronous power generation branches 1204 can simulate multiple power generation modes, such as three-phase power generation (thermal power generation, hydropower generation, etc.). In other words, the simulation device 120 corresponding to each first synchronous power generation branch 1204 can simulate multiple power generation modes, and these modes switch between different time periods. The simulation device 120 corresponding to any one of the two second synchronous power generation branches 1205 can simulate one power generation mode, such as two-phase power generation (wind power generation, photovoltaic power generation, etc.). At the same time, the power generation modes corresponding to the three first synchronous power generation branches 1204 or the two second synchronous power generation branches 1205 can achieve at least one power generation mode.

[0119] It should also be understood that, in the embodiments of this application, the controller 150 controlling the three first synchronous power generation branches 1204 or the two second synchronous power generation branches 1205 can also be configured to simulate a third power generation mode at different times. For example, the start-up times of the first synchronous power generation branches 1204 can be slightly different. Alternatively, any two of the three first synchronous power generation branches 1204 can have a common start-up time, and this application does not impose any limitations on this.

[0120] In this embodiment of the application, when there are three first synchronous power generation branches 1204, when three-phase or two-phase power is connected to the grid, the controller 150 controls the three first synchronous power generation branches 1204 or the two second synchronous power generation branches 1205 to be configured to simulate the third power generation mode at the same time, which can realize the grid connection output of two-phase or three-phase power to form multiple power generation modes, thereby improving the flexibility and scenario adaptability of the test system 10.

[0121] Figure 7 A flowchart of a test system 10 provided in another embodiment of this application is shown.

[0122] According to some embodiments of this application, optionally, such as Figure 7 As shown, the second simulated power generation system 1202 includes: a first frequency converter 1207, one end of which is electrically connected to the second switching device 12032, and the other end of which is connected to the interface device 130.

[0123] It should be understood that the first frequency converter 1207 may include a rectifier unit and an inverter unit, which converts the AC power output from the switching device 1203 into DC power, and then performs frequency conversion through the inverter unit to simulate the operating state of the wind turbine power generation mode under different frequency and other conditions, and finally outputs AC power.

[0124] In this embodiment of the application, the first frequency converter 1207 in the second simulated power generation system 1202 can simulate the operating state of the wind turbine power generation mode under different frequency and other conditions, making the simulation process of the simulation device 120 more accurate.

[0125] Figure 8 A schematic flowchart of the first synchronous power generation branch 1204 provided in an embodiment of this application is shown.

[0126] According to some embodiments of this application, optionally, such as Figure 8 As shown, the first synchronous power generation branch 1204 includes: a step-down transformer 12041, one end of which is electrically connected to the power supply device 110, for converting the first AC power into the second AC power; a second frequency converter 12042, one end of which is electrically connected to the step-down transformer 12041, for adjusting the frequency characteristic parameters of the second AC power and outputting the third AC power; an asynchronous motor 12043, one end of which is electrically connected to the second frequency converter 12042, for converting electrical energy into mechanical energy based on the third AC power; and a synchronous motor 12044, one end of which is electrically connected to the asynchronous motor 12043, and the other end of which is electrically connected to the switching device 1203, for outputting the fourth AC power based on the mechanical energy.

[0127] It should be understood that the second synchronous power generation branch 1205 and the first synchronous power generation branch 1204 can be a single branch or overlapping branches. Therefore, the above can also be described as the first synchronous power generation branch 1204 and / or the second synchronous power generation branch 1205 including: a step-down transformer 12041, one end of which is electrically connected to the power supply device 110, for converting the first AC power into the second AC power; a second frequency converter 12042, one end of which is electrically connected to the step-down transformer 12041, for adjusting the frequency characteristic parameters of the second AC power and outputting the third AC power; an asynchronous motor 12043, one end of which is electrically connected to the second frequency converter 12042, for converting electrical energy into mechanical energy based on the third AC power; and a synchronous motor 12044, one end of which is electrically connected to the asynchronous motor 12043, and the other end of which is electrically connected to the switching device 1203, for outputting the fourth AC power based on the mechanical energy.

[0128] It should be understood that the step-down transformer 12041 converts high-voltage electrical energy into low-voltage electrical energy to meet the input requirements of subsequent equipment. In the synchronous power generation branch 1204, the step-down transformer 12041 is used to reduce the input high-voltage electricity (the voltage of the power supply unit 110) to a level suitable for the operating voltage of the rectifier unit or inverter unit.

[0129] The second frequency converter 12042 includes a rectifier unit and an inverter unit. The rectifier unit converts AC power to DC power, providing a stable DC power supply to the inverter unit. The inverter unit converts DC power to AC power, converting the DC power output from the rectifier unit or the electrical energy released by the energy storage device into AC power suitable for use by the asynchronous motor 12043 or the synchronous generator.

[0130] The asynchronous motor 12043 converts electrical energy into mechanical energy and is used as an electric motor to drive the synchronous motor 12044 and provide mechanical power.

[0131] The synchronous motor 12044 converts mechanical energy into electrical energy and outputs it to the electrical interface device 130 for use and testing by the energy storage device 140 under test.

[0132] It should also be understood that in this embodiment, the asynchronous motor 12043 drives the synchronous motor 12044. When the asynchronous motor 12043 is energized and starts, it generates a rotating magnetic field, and the rotor begins to rotate due to electromagnetic induction. Because the asynchronous motor 12043 has a large starting torque, it can quickly accelerate the rotor of the synchronous motor 12044. When the speed of the synchronous motor 12044 approaches the synchronous speed, a DC current is applied to its excitation winding to establish a rotor magnetic field. The asynchronous motor 12043 continues to provide mechanical power, maintaining the stable speed of the synchronous motor 12044. The synchronous motor 12044 can operate as a generator (outputting electrical energy).

[0133] In this embodiment, the conversion of electrical energy, mechanical energy, and electrical energy is achieved through a step-down transformer 12041, a second frequency converter 12042, an asynchronous motor 12043, and a synchronous motor 12044, replacing other chemical energy to electrical energy conversions, thereby simulating multiple power generation modes and improving the flexibility and scenario adaptability of the test system 10.

[0134] According to some embodiments of this application, optionally, the second frequency converter 12042 includes: a generator model for simulating at least one power generation mode, including thermal power generation, hydropower generation, diesel power generation and wind power generation.

[0135] The generator model can include a generator model for thermal power generation. By including a generator model for thermal power generation, the inertia and frequency regulation characteristics of thermal power generation can be simulated. The inertia of the thermal power generator mainly comes from the rotational inertia of the steam turbine and the generator. When the frequency of the power supply unit 110 changes, the thermal power generator adjusts the steam flow to change the turbine's output power, thereby regulating the generator's speed.

[0136] It should be understood that the frequency regulation characteristics of a thermal power generator include primary frequency regulation and secondary frequency regulation. Primary frequency regulation is a rapid response to frequency changes, adjusting the output power to restore the frequency. Secondary frequency regulation, through the coordination of controller 150, further adjusts the output power to maintain the frequency stability of the power supply unit 110. In the generator model, by inputting DC power through the rectifier unit into the generator model, the output is AC power that simulates the inertia and frequency regulation characteristics of a thermal power generator.

[0137] It should be understood that the inertia of hydroelectric power generation mainly comes from the rotational inertia of the turbine and generator. Changes in water flow will cause changes in the turbine speed, thus affecting the generator's output frequency.

[0138] The generator model may also include a hydroelectric generator model, similar to a thermal generator model, which is used to input DC power through the rectifier unit into the generator model and output AC power containing the inertia and frequency regulation characteristics of a hydroelectric generator.

[0139] The generator model also includes a diesel generator model, which is similar to the thermal power generator model. It is used to input DC power through the rectifier unit into the generator model and output AC power that simulates the inertia and frequency regulation characteristics of a diesel generator.

[0140] It should be understood that the inertia of a diesel generator mainly comes from the mechanical structure of the engine and generator. When the load changes, the engine needs to adjust the fuel supply to change its speed.

[0141] The generator model also includes a wind power generation model, which is similar to the thermal power generation model. It is used to input DC power through the rectifier unit into the generator model and output AC power that simulates the inertia and frequency regulation characteristics of a wind turbine.

[0142] In this embodiment of the application, a generator model is set in the first frequency converter 1207 to simulate multiple power generation modes, thereby improving the flexibility and scenario adaptability of the test system 10. In addition, the generator model can accurately simulate multiple power generation modes, providing reliable data for power grid stability research.

[0143] According to some embodiments of this application, optionally, at least two of the synchronous motors 12044 in the three first synchronous power generation branches 1204 have different capacities.

[0144] It should be understood that at least two of the synchronous motors 12044 in the three first synchronous power generation branches 1204 have different capacities, which can realize flexible switching of multiple capacities to meet the needs of different experimental scenarios. For example, the capacities of the three synchronous motors 12044 in the three first synchronous power generation branches 1204 are 1MW, 2MW and 2MW respectively, which can realize flexible switching of 1MW to 5MW capacity to meet the needs of different experimental scenarios.

[0145] Optionally, the synchronous motors 12044 in the three first synchronous power generation branches 1204 can also have the same capacity. For example, the synchronous motors 12044 in the three first synchronous power generation branches 1204 can all have a capacity of 2MW, which can achieve capacities of 2MW, 4MW and 6MW.

[0146] It should be understood that the same applies to the second synchronous power generation branch 1205. When there are multiple second synchronous power generation branches 1205, the synchronous motors 12044 included in them have the same capacity.

[0147] In this embodiment of the application, by using synchronous motors 12044 of different capacities, the flexibility of the test system 10 can be improved, and the research needs of different power grid scenarios can be met.

[0148] Figure 9 A flowchart of a test system 10 provided in another embodiment of this application is shown.

[0149] According to some embodiments of this application, optionally, such as Figure 10 As shown, the test system 10 also includes a step-up transformer 160, one end of which is electrically connected to the switching device 1203, and the other end of which is electrically connected to the interface device 130; wherein, the input of the step-up transformer 160 is three-phase power or two-phase power.

[0150] It should be understood that the step-up transformer 160 raises the lower voltage output from the synchronous motor 12044 to the voltage of the power supply unit 110, such as 35kV, so as to connect to the high-voltage power grid.

[0151] In this embodiment, the step-up transformer 160 outputs high-voltage electricity from the low-voltage three-phase or two-phase power supply and matches it with the voltage of the power supply device 110 to perform more accurate testing of the energy storage device 140 under test.

[0152] Figure 10 A flowchart of a test system 10 provided in another embodiment of this application is shown.

[0153] According to some embodiments of this application, optionally, such as Figure 10 As shown, the test system 10 also includes a load simulation device 180, one end of which is electrically connected to the power supply device 110, and the other end of which is electrically connected to the interface device 130.

[0154] It should be understood that the load simulation device 180 is a device or system used to simulate actual loads. It can be used to simulate different types of electrical loads in order to test and verify the performance and stability of power systems or equipment under different load conditions.

[0155] It should also be understood that the load simulation device 180 can simulate various types of electrical loads, such as resistive loads, inductive loads, capacitive loads, or mixed loads, etc., and this application does not make any limitation in this regard.

[0156] It should also be understood that by changing the size and type of the load, the load simulation device 180 can test the stability of the test system 10 under different load conditions. For example, it can test the response capability of the test system 10 when the load is suddenly increased or decreased.

[0157] In this embodiment of the application, the test system 10 is tested by the load simulation device 180 to improve the stability and reliability of the entire test system 10.

[0158] According to some embodiments of this application, this application also provides an energy storage system, including an energy storage device under test 140 and a test system 10 as described in any of the above embodiments, wherein the test system 10 is used to test the energy storage device under test 140.

[0159] Optional, such as Figure 10As shown, one end of the first switching device 12031 is connected to the synchronous motor 12044, and the other end is connected to the step-up transformer 160. One end of the second switching device 12032 is connected to the synchronous motor 12044, and the other end is connected to another step-up transformer 160. When the first switching device 12031 is closed, the first synchronous power generation branch 1204 is conducting, enabling three-phase power output. When the second switching device 12032 is closed, the second synchronous power generation branch 1205 is conducting, enabling two-phase power output.

[0160] According to some embodiments of this application, see Figures 1 to 10 This application provides a test system 10 for an energy storage device, comprising: a power supply device 110, outputting a first alternating current; a simulation device 120, electrically connected to the power supply device 110, for receiving the first alternating current, the simulation device 120 being configured to simulate at least two power generation modes, including thermal power generation, hydropower generation, diesel power generation, and wind power generation; and an interface device 130, one side electrically connected to the simulation device 120 and the other side electrically connected to the energy storage device under test 140, the interface device 130 being used for power exchange between the simulation device 120 and the energy storage device under test 140; wherein, the simulation device 120 includes a first simulated power generation system 1201, the output of the first simulated power generation system 1201 being three-phase power. In this embodiment, the simulation device 120 is configured to simulate at least two power generation modes, capable of adapting to the needs of different types of energy storage devices under test 140. This flexibility allows the test system 10 to cover multiple application scenarios, thereby improving the flexibility and scenario adaptability of the test system 10. In addition, the simulation device 120 can simulate multiple power generation modes, and the test system 10 can coordinate the power generation characteristics of different power supply devices 110 to optimize the operating efficiency of the power system.

[0161] 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. A testing system for an energy storage device, characterized in that, include: Power supply unit (110) for outputting first alternating current; The simulation device (120) is electrically connected to the power supply device (110) to receive the first AC power. The simulation device (120) is configured to simulate at least two power generation modes, including thermal power generation, hydropower generation, diesel power generation and wind power generation. An interface device (130) is electrically connected to the simulation device (120) on one side and to the energy storage device under test (140) on the other side. The interface device (130) is used for energy exchange between the simulation device (120) and the energy storage device under test (140). The simulation device (120) includes a first simulation power generation system (1201), the output of which is three-phase electricity.

2. The testing system according to claim 1, characterized in that, The simulation device (120) is also configured to simulate a first power generation mode and a second power generation mode, and the test system further includes: A controller (150) controls the simulation device (120) to simulate the first power generation mode in a first time period and to simulate the second power generation mode in a second time period.

3. The testing system according to claim 2, characterized in that, The simulation device also includes: The second simulated power generation system (1202) outputs two-phase electricity.

4. The testing system according to claim 3, characterized in that, The simulation device (120) includes: The on / off device (1203) has one end electrically connected to the first analog power generation system (1201) and / or the second analog power generation system (1202), and the other end connected to the interface device (130). The on / off device (1203) is used to control the electrical connection between the first analog power generation system (1201) and / or the second analog power generation system (1202) and the interface device (130).

5. The testing system according to claim 4, characterized in that, The first simulated power generation system (1201) includes: The first synchronous power generation branch (1204) is electrically connected at one end to the power supply device (110) and at the other end to the switching device (1203); The switching device (1203) includes a first switching device (12031). When the simulation device (120) is configured as the first simulated power generation system (1201), the first switching device (12031) is closed to make the first synchronous power generation branch (1204) connected to the interface device (130).

6. The testing system according to claim 5, characterized in that, The second simulated power generation system (1202) includes: The second synchronous power generation branch (1205) is electrically connected at one end to the power supply device (110) and at the other end to the switching device (1203); The switching device (1203) includes a second switching device (12032). When the simulation device (120) is configured as a second simulated power generation system (1202), the second switching device (12032) is closed to make the second synchronous power generation branch (1205) connected to the interface device (130).

7. The testing system according to claim 6, characterized in that, The switching device (1203) includes three first switching devices (12031), and the number of first synchronous power generation branches (1204) is three. Each of the three first switching devices (12031) is electrically connected to the output of the corresponding first synchronous power generation branch (1204) among the three first synchronous power generation branches (1204). The switching device (1203) includes two second switching devices (12032), and the number of second synchronous power generation branches (1205) is two. Each of the two second switching devices (12032) is electrically connected to the output of the corresponding second synchronous power generation branch (1205) of the two second synchronous power generation branches (1205).

8. The testing system according to claim 7, characterized in that, The simulation device (120) is also configured to include a third power generation mode, and the controller (150) is also configured to control three of the first synchronous power generation branches (1204) or two of the second synchronous power generation branches (1205) to be configured to simulate the third power generation mode at the same time.

9. The testing system according to claim 7, characterized in that, The second simulated power generation system (1202) includes: The first frequency converter (1207) has one end electrically connected to the second switching device (12032) and the other end connected to the interface device (130).

10. The testing system according to claim 6, characterized in that, The first synchronous power generation branch (1204) and / or the second synchronous power generation branch (1205) include: A step-down transformer (12041) is electrically connected at one end to the power supply device (110) and is used to convert the first AC power into the second AC power. The second frequency converter (12042) is electrically connected at one end to the step-down transformer (12041) and is used to adjust the frequency characteristic parameters of the second AC power and output the third AC power. An asynchronous motor (12043) is electrically connected at one end to the second frequency converter (12042) for converting electrical energy into mechanical energy based on the third AC power. The synchronous motor (12044) is electrically connected at one end to the asynchronous motor (12043) and at the other end to the switching device (1203), and is used to output a fourth AC current according to the mechanical energy.

11. The testing system according to claim 10, characterized in that, The second frequency converter (12042) includes: A generator model is used to simulate at least one power generation mode, including thermal power generation, hydropower generation, diesel power generation, and wind power generation.

12. The testing system according to claim 10, characterized in that, At least two of the synchronous motors (12044) in the three first synchronous power generation branches (1204) have different capacities.

13. The testing system according to claim 7, characterized in that, The testing system also includes: A step-up transformer (160) is electrically connected at one end to the switching device (1203) and at the other end to the interface device (130); The input of the step-up transformer (160) is either three-phase or two-phase electricity.

14. The testing system according to any one of claims 1 to 6, characterized in that, The testing system also includes: The load simulation device (180) is electrically connected at one end to the power supply device (110) and at the other end to the interface device (130).

15. An energy storage system, characterized in that, It includes an energy storage device under test and a test system as described in any one of claims 1 to 14, wherein the test system is used to test the energy storage device under test.

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