Energy storage system test system

Abstract

The embodiment of the utility model provides an energy storage system test system, and the system comprises a test bus which is used for connecting an energy storage system to be tested; the alternating-current grid-connected bus is used for connecting a power grid; one end of the power grid simulation device is connected with the test bus, the other end of the power grid simulation device is connected with the alternating-current grid-connected bus, a reserved machine position is arranged on a connecting line of the test bus and the alternating-current grid-connected bus, and the reserved machine position is used for being connected with an energy storage system to be tested; the reserved machine position is connected with the test bus, and a seventh switch is arranged on a connecting line of the reserved machine position and the test bus; the reserved machine position is connected with the alternating-current grid-connected bus, and the reserved machine position and the alternating-current grid-connected bus are provided with an eighth switch. Through the energy storage system test system, the test convenience and flexibility can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of energy storage system testing, and in particular to an energy storage system testing system. Background Art

[0002] Before being connected to the grid, energy storage systems usually need to undergo grid connection testing to ensure that they can operate safely and reliably in various scenarios when connected to the grid.

[0003] However, current grid-connected testing of energy storage systems is usually conducted at the site where the energy storage system is used. However, this implementation method is easily affected by the on-site environment, which leads to relatively large testing limitations. Utility Model Content

[0004] The purpose of this application is to provide an energy storage system testing system that can improve the flexibility of grid-connected testing of energy storage systems.

[0005] In a first aspect, the utility model provides an energy storage system testing system, comprising: a test busbar for connecting an energy storage system to be tested; an AC grid-connected busbar for connecting to a power grid; a power grid simulation device, one end of the power grid simulation device being connected to the test busbar, and the other end of the power grid simulation device being connected to the AC grid-connected busbar; a reserved position being provided on the connection line between the test busbar and the AC grid-connected busbar, the reserved position being used to connect the energy storage system to be tested; the reserved position being connected to the test busbar, and a seventh switch being provided on the connection line between the reserved position and the test busbar; the reserved position being connected to the AC grid-connected busbar, and an eighth switch being provided between the reserved position and the AC grid-connected busbar.

[0006] In the above implementation, by constructing an energy storage system test system, the testing of the energy storage system can be made more flexible, and there is no need to conduct grid-connected testing in actual usage scenarios. Furthermore, by configuring a test busbar to connect the energy storage system to be tested, the connection between the energy storage system and the energy storage system test system is facilitated, thereby improving the convenience of energy storage system testing. Furthermore, by controlling the seventh switch and the eighth switch, the energy storage system to be tested can be directly connected to the power grid, or only connected to the simulation environment where the power grid simulation device is located, thereby flexibly adjusting the test environment of the energy storage system.

[0007] In an optional embodiment, the test busbar includes multiple groups of test busbars.

[0008] In the above implementation, multiple groups of test buses can be set up, which means that multiple energy storage systems can be connected at the same time to enable grid-connected testing of one or more energy storage systems at the same time, making the test environment of the energy storage system test system more variable and adaptable to more different test requirements.

[0009] In an optional embodiment, the multiple groups of test busbars include: a first test busbar, a second test busbar and a third test busbar; a first switch is set on the connecting line between the first test busbar and the second test busbar, and a second switch is set on the connecting line between the second test busbar and the third test busbar.

[0010] In the above implementation, multiple groups of test busbars can be provided, and when multiple groups of test busbars are connected, they can meet the testing requirements of a larger capacity energy storage system.

[0011] In an optional embodiment, the power grid simulation device includes a first current conversion unit and a second current conversion unit; the first current conversion unit and the second current conversion unit are connected in series.

[0012] In an optional embodiment, the first conversion unit includes a multi-winding transformer; and the second conversion unit includes a three-phase to single-phase conversion unit.

[0013] In an optional embodiment, it also includes: an impedance simulation device and a reserved position for test equipment; one end of the impedance simulation device is connected to the test bus, and the other end of the impedance simulation device is connected to the AC grid-connected bus; one end of the reserved position for test equipment is connected to the test bus, and the other end of the reserved position for test equipment is connected to the AC grid-connected bus; the grid simulation device is connected in parallel with the reserved position for test equipment and in series with the impedance simulation device.

[0014] In the above implementation, the energy storage system test system can be further configured with an impedance simulation device and reserved test equipment slots. This allows for the connection of more test equipment, enriching the test environment and adapting to various testing requirements. Furthermore, the impedance simulation device can simulate line impedance or high and low voltage faults, enriching the test environment provided by the energy storage system test system.

[0015] In an optional embodiment, the impedance simulation device includes multiple groups of inductance elements, and each group of inductance elements is connected in series or in parallel.

[0016] In an optional embodiment, a third switch is provided on the connection line between the impedance simulation device and the test bus, and a fourth switch is provided on the connection line between the impedance simulation device and the AC grid-connected bus; a fifth switch is provided on the connection line between the test equipment reserved position and the test bus, and a sixth switch is provided on the connection line between the test equipment reserved position and the AC grid-connected bus.

[0017] In the above implementation, the impedance simulation device can be configured with a third switch and a fourth switch, and the test equipment reserved position can be configured with a fifth switch and a sixth switch. In this case, the impedance simulation device can be connected and disconnected from each busbar by closing and opening the third and fourth switches. Similarly, the test equipment reserved position can be connected and disconnected from each busbar by controlling the closing and opening of the fifth and sixth switches, thereby adapting to switching between different test environments. When only one power grid simulation device is required to perform a grid-connected test, the third, fourth, fifth, and sixth switches can all be opened, thereby disconnecting the impedance simulation device from the equipment reserved position. When a more complex test environment is required, the third, fourth, fifth, and sixth switches can all be closed to connect the impedance simulation device to the equipment reserved position.

[0018] In an optional embodiment, the reserved positions include a first type of reserved positions and a second type of reserved positions; the second type of reserved positions are connected to the test bus with a transformer for converting the first voltage of the test bus into a second voltage; the first type of reserved positions are used to connect to the energy storage system to be tested that is adapted to the first voltage; the second type of reserved positions are used to connect to the energy storage system to be tested that is adapted to the second voltage.

[0019] In the above implementation, a first type of reserved positions and a second type of reserved positions can also be set, and the two types of reserved positions are suitable for the testing requirements of new energy storage systems with different voltage levels, so that the energy storage system test system can adapt to the testing requirements of more energy storage systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without any creative work.

[0021] Figure 1 A circuit diagram of a first energy storage system testing system provided in an embodiment of the present application;

[0022] Figure 2 A circuit diagram of a second energy storage system testing system provided in an embodiment of the present application;

[0023] Figure 3 A circuit diagram of a power grid simulation device for an energy storage system test system provided in an embodiment of the present application;

[0024] Figure 4A circuit diagram of a third energy storage system testing system provided in an embodiment of the present application;

[0025] Figure 5 A circuit diagram of an impedance simulation device for an energy storage system test system provided in an embodiment of the present application;

[0026] Figure 6 This is a circuit diagram of the fourth energy storage system testing system provided in an embodiment of the present application.

[0027] Icons: 110-grid simulation device; 120-impedance simulation device; 130-reserved position for test equipment; 140-reserved position; 141-first category reserved position; 142-second category reserved position; K1-first switch; K2-second switch; K3-third switch; K4-fourth switch; K5-fifth switch; K6-sixth switch; K7-seventh switch; K8-eighth switch; K9-ninth switch; K10-tenth switch; K11-eleventh switch; K12-twelfth switch; K13-thirteenth switch; K14-fourteenth switch; K15-fifteenth switch; CB1-first circuit breaker; CB2-second circuit breaker; CB3-third circuit breaker; CB4-fourth circuit breaker; X1-first inductor element; X2-second inductor element. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be described below in conjunction with the accompanying drawings in the embodiments of the present application.

[0029] It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings. At the same time, in the description of this application, the terms "first", "second", etc. are only used to distinguish the description and should not be understood as indicating or implying relative importance.

[0030] In the description of this application, it should be noted that the terms "upper", "lower", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model products are usually placed when in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be interpreted as a limitation of this application.

[0031] It should also be noted that, in the description of this application, unless otherwise expressly specified or limited, the terms "disposed," "installed," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0032] An energy storage system is a system used to store and output electrical energy. It can balance the supply and demand of the power grid, improve energy utilization efficiency, and cope with power supply intermittency.

[0033] Before connecting an energy storage system to the grid, or during its operation after connection, a grid-connection test is required to ensure safe and stable operation of the energy storage system. This test verifies the compatibility of the energy storage system with the grid, ensuring that it meets grid operation requirements while connected.

[0034] However, current grid-connection testing of energy storage systems is conducted on-site, subject to numerous constraints, including the project site and local grid conditions. Furthermore, if problems are discovered during on-site testing, the system must be returned to the factory for rectification, severely impacting project construction efficiency.

[0035] Based on the above research, an embodiment of the present application provides an energy storage system testing system, which serves as a platform for grid-connected testing of energy storage systems, thereby improving the flexibility and convenience of energy storage system testing.

[0036] The embodiment of the present application provides an energy storage system testing system, such as Figure 1 As shown, Figure 1 Schematic diagram of the structure of the energy storage system test system provided in an embodiment of the present application. The energy storage system test system may include: a test bus, an AC grid-connected bus, and a grid simulation device 110.

[0037] The test busbar can be used to connect the energy storage system to be tested. The AC grid-connected busbar can be used to connect to the power grid.

[0038] The power grid simulation device 110 has one end connected to the test bus, and the other end connected to the AC grid-connected bus.

[0039] When the energy storage system to be tested needs to be tested, the energy storage system to be tested can be connected to the test bus to achieve connection with the grid simulation device 110. Based on the grid simulation device 110, various grid operating conditions can be simulated on the test bus to test the connected energy storage system to be tested.

[0040] Optionally, a switch may be provided on the connection line between the grid simulation device 110 and the test bus, and a switch may also be provided on the connection line between the grid simulation device 110 and the AC grid-connected bus. For example, when testing is not required, or in other cases where it is necessary to disconnect the grid simulation device 110 from the grid, the disconnection of the grid simulation device 110 from the grid can be achieved by disconnecting the switch on the connection line between the grid simulation device 110 and the AC grid-connected bus. For example, after completing the test of the energy storage system to be tested, the connection between the energy storage system to be tested and the grid simulation device 110 can also be disconnected by disconnecting the switch on the connection line between the grid simulation device 110 and the test bus.

[0041] In some optional embodiments, the test busbar includes multiple groups of test busbars. Figure 2 In the example shown, three test busbars are provided. Of course, based on actual test requirements, more or fewer test busbars can be provided to facilitate the joint testing of more or fewer energy storage systems to be tested.

[0042] In this embodiment, each group of test busbars can be connected to the energy storage system separately, and each group of test busbars can be connected to the power grid simulation device 110 .

[0043] Each set of test busbars and the grid simulation device 110 can form an independent test unit, through which the energy storage system to be tested connected thereto can be tested.

[0044] Optionally, a switch may be provided on the connection line between the power grid simulation device 110 and each set of test busbars, and the connection relationship between the power grid simulation device 110 and the connection line between each set of test busbars may be controlled by the switch.

[0045] Based on the above embodiments, by providing multiple groups of test busbars, it is possible to connect more energy storage systems at one time to test multiple energy storage systems.

[0046] In some optional embodiments, such as Figure 2 As shown, the multiple test busbar groups include: a first test busbar, a second test busbar and a third test busbar.

[0047] A first switch K1 is provided on the connection line between the first test busbar and the second test busbar, and a second switch K2 is provided on the connection line between the second test busbar and the third test busbar.

[0048] For example, when the first switch K1 and the second switch K2 are both disconnected, each group of test busbars and the power grid simulation device 110 may form a relatively independent test unit.

[0049] For example, when the first switch K1 is open and the second switch K2 is closed, the second test busbar and the third test busbar form a whole, which can be used to test energy storage systems with a larger voltage level.

[0050] For example, when the first switch K1 and the second switch K2 are both closed, the first test bus, the second test bus and the third test bus form a whole, which can be used to test energy storage systems with a larger voltage level.

[0051] In the above embodiment, different test environments can be set under the control of the first switch K1 and the second switch K2, thereby meeting more diverse test requirements.

[0052] In some optional embodiments, the power grid simulation device 110 includes a first current conversion unit and a second current conversion unit; the first current conversion unit and the second current conversion unit are connected in series.

[0053] The first current conversion unit can be used to achieve filtering, and the second current conversion unit can be used to absorb the test impact generated on the test bus, thereby isolating the test disturbance.

[0054] In the above implementation, two-stage converter units can be used to isolate the test disturbance in two ways, thereby ensuring the power quality on the grid side.

[0055] Alternatively, as Figure 3 As shown, the first conversion unit includes a multi-winding transformer; the second conversion unit includes a three-phase to single-phase conversion unit.

[0056] The filter capacitor in the three-phase to single-phase converter unit can absorb the test impact generated on the test bus. The primary and secondary sides of the multi-winding transformer are electrically isolated, and its high-frequency loss forms a high-frequency filtering characteristic. These two methods can be used to isolate the test disturbance.

[0057] In some optional embodiments, in order to meet more testing requirements, more test environments are provided. Figure 4 As shown, the energy storage system testing system may further include: an impedance simulation device 120 and a test equipment reserved position 130 .

[0058] One end of the impedance simulation device 120 is connected to the test bus, and the other end of the impedance simulation device 120 is connected to the AC grid-connected bus.

[0059] In this embodiment, if there are multiple groups of test busbars, connection can be achieved with only one group of test busbars.

[0060] One end of the test equipment reserved position 130 is connected to the test bus, and the other end of the test equipment reserved position 130 is connected to the AC grid-connected bus.

[0061] The power grid simulation device 110 is connected in parallel with the test equipment reserved position 130 and in series with the impedance simulation device 120 .

[0062] In this embodiment, the test equipment reserved slot 130 can serve as a reserve port. When more complex tests are required on the energy storage system, the test equipment reserved slot 130 can be used to connect test equipment that meets different testing requirements, thereby providing more tests for the energy storage system. By reserving the test equipment reserved slot 130, changes in testing requirements can be better accommodated.

[0063] In some optional embodiments, such as Figure 5 As shown, the impedance simulation device 120 includes multiple groups of inductance elements, and each group of inductance elements is connected in series or in parallel.

[0064] The impedance of the power grid system is simulated by connecting multiple inductive elements in series or in parallel.

[0065] For example, Figure 5 As shown, a first inductor X1 and a second inductor X2 are provided. The second inductor X2 is grounded, and one end of the first inductor X1 is connected to the AC grid busbar to achieve connection to the grid. The second inductor X2 can be connected in parallel or in series with the first inductor X1.

[0066] exist Figure 5 In the illustrated example, circuit breakers are provided at both ends of the first inductor element X1, namely, a first circuit breaker CB1 and a third circuit breaker CB3. The first inductor element X1 may also be connected in parallel with a second circuit breaker, shown as a second circuit breaker CB2. The second inductor element X2 may be connected in parallel with the third circuit breaker CB3, with one end of the second inductor element X2 connected to the connection point between the first inductor element X1 and the third circuit breaker CB3, and the other end of the second inductor element X2 grounded. A fourth circuit breaker CB4 may be provided on the connecting line between the first inductor element X1 and the connection point between the first inductor element X1 and the third circuit breaker CB3.

[0067] In this embodiment, multiple sets of inductive elements connected in series and parallel can simulate low-voltage ride-through (LVRT) wiring, generating a voltage drop on the test bus. Impedance simulator 120 can be connected in series with grid simulator 110, and by inserting different inductive elements, simulated grid system impedance can be achieved.

[0068] In some optional embodiments, see Figure 5 As shown, a third switch K3 is provided on the connection line between the impedance simulation device 120 and the test bus, and a fourth switch K4 is provided on the connection line between the impedance simulation device 120 and the AC grid-connected bus.

[0069] A fifth switch K5 is provided on the connection line between the test equipment reserved position 130 and the test bus, and a sixth switch K6 is provided on the connection line between the test equipment reserved position 130 and the AC grid-connected bus.

[0070] For example, when a more complex test environment is required, whether the impedance simulation device 120 is connected to the line is selected based on actual conditions.

[0071] In some scenarios, when grid impedance simulation is required, the third switch K3 and the fourth switch K4 can be closed to connect the impedance simulation device 120 to the line and simulate the grid system impedance. In some scenarios, when grid impedance simulation is not required, the third switch K3 and the fourth switch K4 can be opened to disconnect the impedance simulation device 120.

[0072] For example, when a more complex test environment is required, whether to connect other test equipment is selected based on actual conditions.

[0073] In some scenarios, if the power grid simulation device 110 alone is no longer sufficient to meet the energy storage system's testing requirements and other test equipment needs to be connected, the fifth switch K5 and the sixth switch K6 can be closed to connect the test equipment reserved position 130 to the circuit. The required test equipment can then be connected to the test equipment reserved position 130 to provide more testing for the energy storage system. In some scenarios, if the power grid simulation device 110 alone is sufficient to meet the energy storage system's testing requirements, the fifth switch K5 and the sixth switch K6 can be opened to disconnect the test equipment reserved position 130.

[0074] By setting the switches described above, the flexibility of the energy storage system test system can be increased to better adapt to different test requirements.

[0075] In order to facilitate the parallel connection of the test equipment reserved position 130 and the power grid simulation device 110, and then in series with the impedance simulation device 120, the energy storage system test system can provide an AC grid-type test busbar, which is connected to the test busbar.

[0076] exist Figure 4 In the example shown, multiple test busbars may be included. The AC grid-type test busbar may be connected to each test busbar group, and the test equipment reserved position 130 may be connected to one end connected to the test busbar. The AC grid-type test busbar may be connected to the end of the power grid simulation device 110 that is connected to the test busbar.

[0077] Optionally, each line connected to the AC grid-type test busbar may be provided with a control switch to facilitate adjustment of the connection status of the line.

[0078] The AC grid-connected test busbar may also be connected to one end of the impedance simulation device 120 connected to the AC grid-connected busbar.

[0079] Alternatively, as Figure 6 As shown, the first end of the power grid simulation device 110 is connected to the test bus and the AC grid-type test bus, and a ninth switch K9 is provided on the connection line between the first end of the power grid simulation device 110 and the test bus, and a tenth switch K10 is provided on the connection line between the first end of the power grid simulation device 110 and the AC grid-type test bus. The second end of the power grid simulation device 110 is connected to the AC grid-connected bus, and an eleventh switch K11 is provided on the connection line between the second end of the power grid simulation device 110 and the AC grid-connected bus.

[0080] exist Figure 6 In the example shown, three groups of test busbars are shown. The first end of the power grid simulation device 110 is connected to the three groups of test busbars, and a ninth switch K9 is provided on the connection line between the first end of the power grid simulation device 110 and each group of test busbars; the connection point between the first end of the power grid simulation device 110 and each group of test busbars is connected to the AC grid-type test busbar, and a tenth switch K10 is also provided.

[0081] like Figure 6 As shown, the first end of the impedance simulation device 120 is also connected to the test bus, and a third switch K3 is provided on the connection line between the first end of the impedance simulation device 120 and the test bus. The second end of the impedance simulation device 120 is connected to both the AC grid-type test bus and the AC grid-connected bus. A thirteenth switch K13 may be provided on the connection line between the second end of the impedance simulation device 120 and the AC grid-connected bus, and a fourth switch K4 may be provided on the connection line between the second end of the impedance simulation device 120 and the AC grid-connected bus. Among them, one end of the thirteenth switch K13 may be connected to the connection point between the second end of the impedance simulation device 120 and the AC grid-connected bus, and the other end of the thirteenth switch K13 is connected to the AC grid-type test bus. Figure 6 In the example shown, three groups of test busbars are shown. The first end of the impedance simulation device 120 can be connected to only one group of test busbars. A third switch K3 is provided between the first end of the impedance simulation device 120 and the connected test busbars.

[0082] like Figure 6As shown, the first end of the test equipment reserved position 130 is connected to both the test bus and the AC grid-type test bus, and the second end of the test equipment reserved position 130 is connected to the AC grid-connected bus. A fifth switch K5 is provided on the connection line between the first end of the test equipment reserved position 130 and the test bus, and a twelfth switch K12 is provided on the connection line between the first end of the test equipment reserved position 130 and the AC grid-type test bus. One end of the twelfth switch K12 is connected to the connection point between the first end of the test equipment reserved position and the AC grid-type test bus, and the other end of the twelfth switch K12 is connected to the AC grid-type test bus.

[0083] exist Figure 6 In the example shown, when it is necessary to combine the power grid simulation device 110, the impedance simulation device 120, and other test equipment to jointly test the energy storage system, other test equipment can be connected to the test equipment reserved position 130. The third switch K3, the fourth switch K4, the ninth switch K9, the tenth switch K10, the twelfth switch K12, and the thirteenth switch K13 are all closed, connecting the power grid simulation device 110 in parallel with the other test equipment and then in series with the impedance simulation device 120.

[0084] Through the action of the AC grid-type test bus, the connection relationship of each component in the system can be adjusted, and the flexibility of the energy storage system test system wiring can be increased, thereby meeting the testing requirements in more different test scenarios.

[0085] In some optional embodiments, such as Figure 1 As shown, a reserved position 140 is provided between the test bus and the AC grid-connected bus, and the reserved position 140 is used to connect the energy storage system to be tested.

[0086] To facilitate the connection and disconnection of the energy storage system to be tested from the test bus, as well as the connection and disconnection of the energy storage system to the AC grid bus, a reserved position 140 is connected to the test bus, and a seventh switch K7 is provided on the connection line between the reserved position 140 and the test bus; an eighth switch K8 is provided between the reserved position 140 and the AC grid bus.

[0087] The seventh switch K7 can be used to control the connection and disconnection between the reserved position 140 and the test bus. The eighth switch K8 can be used to control the connection and disconnection between the reserved position 140 and the AC grid bus, thereby controlling the connection and disconnection between the reserved position 140 and the grid.

[0088] Optionally, if the energy storage system test system has multiple test busbars, each test busbar may be provided with a reserved position 140 for connecting to the energy storage system to be tested. A seventh switch K7 may be provided on the connection line between each reserved position 140 and the test busbar to which it is connected. An eighth switch K8 may be provided on the connection line between each reserved position 140 and the AC grid-connected busbar. Each switch controls the connection and disconnection between the reserved position 140 and the test busbar to which it is connected, and the connection and disconnection between the reserved position 140 and the AC grid-connected busbar.

[0089] In a test requirement, only a connection relationship with the grid simulation device 110 is required, and the switch on the connection line between the reserved position 140 and the AC grid bus can be disconnected, thereby disconnecting the energy storage system to be tested in the reserved position 140 from the grid.

[0090] In one test requirement, for example, only debugging of the energy storage system in the energized state is required, or another example is a long-term grid-connected test, without the need for testing the grid simulation device 110. In this case, only direct grid connection is required for testing. The switch on the connection line between the reserved position 140 and the test bus can be disconnected, thereby disconnecting the energy storage system to be tested in the reserved position 140 from the test bus, and thus also disconnecting the grid simulation device 110 on the test bus.

[0091] Through the above implementation logic, the connection relationship between the energy storage system to be tested and various devices can be flexibly adjusted based on the switches set on each line, thereby changing various test environments to improve the flexibility of the energy storage system to be tested.

[0092] In some optional embodiments, such as Figure 6 As shown, the reserved seats 140 include a first type of reserved seats 141 and a second type of reserved seats 142 .

[0093] The second type of reserved machine position 142 is connected to the test busbar and is connected to a transformer for converting the first voltage of the test busbar into a second voltage.

[0094] The first type of reserved position 141 is used to connect the energy storage system to be tested that is adapted to the first voltage; the second type of reserved position 142 is used to connect the energy storage system to be tested that is adapted to the second voltage.

[0095] Exemplarily, the first voltage may be 35 kV, and the second voltage may be 10 kV.

[0096] Optionally, when there are multiple groups of test busbars, two types of reserved positions 140 can be set in only one group of test busbars to connect energy storage systems of different voltage levels to provide testing for energy storage systems of different voltage levels.

[0097] Optionally, two types of reserved positions 140 may be provided in each group of test busbars for connecting energy storage systems of different voltage levels to provide testing for energy storage systems of different voltage levels.

[0098] exist Figure 6 In the illustrated example, the first end of the second-type reserved position 142 is connected to the test bus, and the second end of the second-type reserved position 142 is connected to the AC grid-connected bus. A fourteenth switch K14 is provided on the line connecting the first end of the second-type reserved position 142 to the test bus, and a fifteenth switch K15 is provided on the line connecting the second end of the second-type reserved position 142 to the AC grid-connected bus. To connect only to the test bus, the fourteenth switch K14 can be closed and the fifteenth switch K15 can be opened. To connect only to the AC grid-connected bus, the fourteenth switch K14 can be opened and the fifteenth switch K15 can be closed.

[0099] By setting up multiple types of reserved positions 140, the testing requirements of energy storage systems with more different voltage levels can be met.

[0100] The following describes how to use the energy storage system testing system provided in the embodiments of the present application with reference to examples.

[0101] In one usage scenario, it is necessary to conduct a grid-connected test on the energy storage system. The energy storage system can be connected to any reserved machine position 140, and the seventh switch K7 on the connection line between the reserved machine position 140 to which the energy storage system is connected and the test bus is closed. The ninth switch K9 on the connection line between the power grid simulation device 110 and the test bus is controlled to be closed, and the eleventh switch K11 between the power grid simulation device 110 and the AC grid-connected bus is closed.

[0102] In one scenario, the energy storage system needs to be grid-connected and debugged, and requires long-term grid connection. In this scenario, the energy storage system only needs to be connected to the grid. The energy storage system can be connected to any reserved slot 140 and the eighth switch K8 on the line connecting the reserved slot 140 to the AC grid busbar is closed.

[0103] In one usage scenario, when other test equipment is needed to assist in testing, the test equipment reserved position 130 and the power grid simulation device 110 can be connected in parallel. The ninth switch K9 on the connection line between the first end of the power grid simulation device 110 and the test bus, and the tenth switch K10 on the connection line between the first end of the power grid simulation device 110 and the AC grid-type test bus are both closed. The fifth switch K5 on the connection line between the first end of the test equipment reserved position 130 and the test bus, and the twelfth switch K12 on the connection line between the first end of the test equipment reserved position 130 and the AC grid-type test bus are both closed; the sixth switch K6 on the connection line between the second end of the test equipment reserved position 130 and the AC grid-connected bus is also closed. The energy storage system is connected to any of the reserved positions 140, and the seventh switch K7 on the connection line between the reserved position 140 to which the energy storage system is connected and the test bus is closed. The ninth switch K9 on the connection line between the power grid simulation device 110 and the test bus is controlled to close, and the eleventh switch K11 between the power grid simulation device 110 and the AC grid-connected bus is controlled to close. Through the above-mentioned switch closing control, the test equipment reserved position 130 and the power grid simulation device 110 can be connected in parallel and connected to the power grid.

[0104] In one use scenario, when testing requires the assistance of other test equipment, the test equipment reserved position 130 can be connected in parallel with the grid simulation device 110 and then in series with the impedance simulation device 120. The ninth switch K9 connecting the first end of the grid simulation device 110 to the test busbar and the tenth switch K10 connecting the first end of the grid simulation device 110 to the AC grid-type test busbar are both closed. The third switch K3 connecting the first end of the impedance simulation device 120 to the test busbar is closed, the thirteenth switch K13 connecting the second end of the impedance simulation device 120 to the AC grid-type test busbar is closed, and the fourth switch K4 connecting the second end of the impedance simulation device 120 to the AC grid-connected busbar is closed. The fifth switch K5 connecting the first end of the test equipment reserved position 130 to the test busbar and the twelfth switch K12 connecting the first end of the test equipment reserved position 130 to the AC grid-type test busbar are both closed. The sixth switch K6 connecting the second end of the test equipment reserved position 130 to the AC grid-connected busbar is also closed. The energy storage system is connected to any of the reserved positions 140. The seventh switch K7 on the line connecting the reserved position 140 to the test bus is closed. The ninth switch K9 on the line connecting the power grid simulator 110 to the test bus is also closed, as is the eleventh switch K11 between the power grid simulator 110 and the AC grid-connected bus. This switch closure control allows the test equipment reserved position 130 to be connected in parallel with the power grid simulator 110, then in series with the impedance simulator 120, and finally connected to the power grid.

[0105] Optionally, based on different actual needs, different connections can be realized based on the combination of various connection lines of the energy storage system test system and the control of opening and closing of each switch to achieve different testing needs.

[0106] The foregoing is merely an optional embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included within the scope of protection of the present application. It should be noted that similar reference numerals and letters represent similar items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined or explained in subsequent figures.

[0107] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. An energy storage system testing system, characterized in that: include: Test bus, used to connect the energy storage system to be tested; AC grid-connected busbar, used to connect to the power grid; A power grid simulation device, one end of which is connected to the test bus, and the other end of which is connected to the AC grid-connected bus; A reserved position is provided on the connection line between the test busbar and the AC grid-connected busbar, and the reserved position is used to connect the energy storage system to be tested; The reserved position is connected to the test bus, and a seventh switch is provided on the connection line between the reserved position and the test bus; The reserved position is connected to the AC grid-connected bus, and an eighth switch is provided between the reserved position and the AC grid-connected bus.

2. The energy storage system testing system according to claim 1, characterized in that: The test busbars include multiple groups of test busbars.

3. The energy storage system testing system according to claim 2, characterized in that: The multiple groups of test busbars include: a first test busbar, a second test busbar and a third test busbar; A first switch is provided on the connection line between the first test busbar and the second test busbar, and a second switch is provided on the connection line between the second test busbar and the third test busbar.

4. The energy storage system testing system according to claim 1, characterized in that: The power grid simulation device includes a first current conversion unit and a second current conversion unit; the first current conversion unit and the second current conversion unit are connected in series.

5. The energy storage system testing system according to claim 4, characterized in that: The first conversion unit includes a multi-winding transformer; the second conversion unit includes a three-phase to single-phase conversion unit.

6. The energy storage system testing system according to claim 1, characterized in that: Also includes: Reserved space for impedance simulation devices and test equipment; One end of the impedance simulation device is connected to the test bus, and the other end of the impedance simulation device is connected to the AC grid-connected bus; One end of the test equipment reserved position is connected to the test bus, and the other end of the test equipment reserved position is connected to the AC grid-connected bus; The power grid simulation device is connected in parallel with the reserved position of the test equipment and in series with the impedance simulation device.

7. The energy storage system testing system according to claim 6, characterized in that: The impedance simulation device includes multiple groups of inductance elements, and each group of inductance elements is connected in series or in parallel.

8. The energy storage system testing system according to claim 6, characterized in that: A third switch is provided on the connection line between the impedance simulation device and the test bus, and a fourth switch is provided on the connection line between the impedance simulation device and the AC grid-connected bus; A fifth switch is provided on the connection line between the test equipment reserved position and the test bus, and a sixth switch is provided on the connection line between the test equipment reserved position and the AC grid-connected bus.

9. The energy storage system testing system according to claim 1, characterized in that: The reserved seats include first-category reserved seats and second-category reserved seats; The second type of reserved position is connected to the test busbar and is connected to a transformer for converting the first voltage of the test busbar into a second voltage; The first type of reserved slot is used to connect the energy storage system to be tested that is adapted to the first voltage; The second type of reserved slot is used to connect the energy storage system to be tested that is adapted to the second voltage.

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