Modular energy storage system test platform and method

Abstract

The application discloses a kind of modular energy storage system test platform and method, comprising: test console and at least one pair of supporting device;Supporting device includes: n intersection and module and n variable pressure module, n intersection and module and n variable pressure module are connected in one-to-one correspondence, first electric switch is connected between each intersection and corresponding variable pressure module, the connection of each intersection and corresponding first electric switch is connected with the second electric switch between adjacent next intersection and module;Wherein, intersection and module all include m parallel PCS units, and the second end between any adjacent two PCS units is all connected with third electric switch;Test console is used to control each electric switch and each PCS unit in at least one pair of supporting device coordinated action realizes the test of group string type energy storage system or centralized energy storage system.The application can be automatically configured into corresponding specification test tooling according to the specification characteristics of the energy storage system to be tested.

Description

Technical Field

[0001] This invention relates to the field of energy storage system testing technology, and in particular to a modular energy storage system testing platform and method. Background Technology

[0002] Energy storage systems consist of numerous battery racks. These racks are connected in series and directly boosted by a PCS inverter, or multiple racks are connected in parallel on the DC side and then fed into the PCS for further inverter boosting. Current energy storage systems have a wide variety of battery specifications and electrical structures, resulting in high system complexity.

[0003] However, existing pre-shipment testing for energy storage systems can only be performed on systems of specific specifications, and most of the testing relies on manual charge-discharge operations, which cannot meet the diverse testing needs of various energy storage system specifications. This may result in some energy storage systems arriving at project sites with functional deficiencies and safety hazards, while also increasing on-site maintenance costs and causing significant waste of resources. Summary of the Invention

[0004] To address the technical problems existing in the background art, this invention proposes a modular energy storage system testing platform and method.

[0005] In a first aspect, the present invention proposes a modular energy storage system test platform, comprising: a test control console and at least one support device; the support device comprises: n parallel modules for connecting battery clusters and n transformer modules for connecting to the power grid, wherein the n parallel modules are connected to the n transformer modules in a one-to-one correspondence, each parallel module is connected to the corresponding transformer module by a first electric switch, and the connection point between each parallel module and the corresponding first electric switch is connected to the next adjacent parallel module by a second electric switch; Each of the cross-parallel modules includes m PCS units; the first end of each PCS unit is connected to the first and second electric switches corresponding to the cross-parallel module, and the second end is used to connect to the battery cluster; and a third electric switch is connected between the second ends of any two adjacent PCS units. Each electric switch and PCS unit is connected to the test console, which is used to control the coordinated operation of each electric switch and PCS unit in at least one pair of devices to achieve the test of a string energy storage system or a centralized energy storage system.

[0006] Preferably, during the coordinated operation, the test console acquires the specification information of the energy storage system under test; based on the specification information, it determines whether the energy storage system under test is a string energy storage system; if so, it obtains the string configuration parameters based on the specification information; if not, it obtains the centralized configuration parameters based on the specification information; based on the string configuration parameters or the centralized configuration parameters, it selects a support device corresponding to the number of energy storage systems under test for configuration. After the energy storage system under test is installed in the configured support device, the test console uses the support device to test the energy storage system under test and obtain the test results.

[0007] Preferably, the specifications include: system type, rated power, rated capacity, AC rated voltage, maximum power of the energy storage system, and rated power and maximum power of the energy storage unit; wherein, the system type is divided into two types: string type and centralized type.

[0008] Preferably, the string configuration parameters include: the number and order of cross-connect modules allocated to the energy storage system under test, the number and order of cross-connect modules allocated to each energy storage unit, and the number and order of PCS units allocated to the corresponding energy storage unit in each cross-connect module, and each battery cluster in each energy storage unit is allocated one PCS unit.

[0009] Preferably, based on the specification information, the string configuration parameters are obtained, specifically including: Determine whether the maximum power of the energy storage system under test is greater than the maximum support power of a single support device; if yes, end the test; if no, divide the maximum power of the energy storage system under test by the maximum power of a single energy storage unit to obtain the number of energy storage units y. Determine if the number of energy storage units y is greater than the number of AC / parallel modules n; if yes, end; if no, for a single energy storage unit, determine if the maximum power of the single energy storage unit is less than or equal to the maximum supported power of the single AC / parallel module. If so, the first y parallel modules are used as parallel modules to be allocated to the energy storage unit, with each energy storage unit corresponding to one parallel module; the maximum power of a single energy storage unit is divided by the maximum power of a single PCS unit to obtain the number of PCS units x, and the first x PCS units in each parallel module are allocated to the corresponding energy storage unit, with each battery cluster corresponding to one PCS unit. If not, divide the maximum power of a single energy storage unit by the maximum supported power of a single AC-parallel module to obtain the quotient r and the remainder P. 余 ; the remainder P 余Divide by the maximum power of a single PCS unit to obtain the number of PCS units x; determine the number of cross-connect modules allocated to the energy storage system under test as y*(r+1); determine whether y*(r+1)>n is satisfied; if yes, end; if no, use the first y*(r+1) cross-connect modules as the cross-connect modules allocated to the energy storage system under test; divide the first y*(r+1) cross-connect modules into y groups, and use the r+1 cross-connect modules in each group as the cross-connect modules allocated to each energy storage unit. All PCS units in the first r cross-connect modules corresponding to each energy storage unit are allocated to the corresponding energy storage unit. The first x PCS units in the (r+1)th cross-connect module corresponding to each energy storage unit are allocated to the corresponding energy storage unit. Each battery cluster in each energy storage unit is allocated one PCS unit.

[0010] Preferably, based on the string configuration parameters, a matching support device is selected and configured to correspond to the number of energy storage systems under test, specifically including: Select a pair of support devices corresponding to the number of energy storage systems under test as the main pair of support devices; according to the string configuration parameters, close all the first electric switches corresponding to the parallel modules of the energy storage systems under test in the main pair of support devices; open all the second electric switches between the parallel modules of the energy storage systems under test; and close all the third electric switches between the PCS units of the corresponding energy storage units in a single parallel module.

[0011] Preferably, the centralized configuration parameters include: the number of PCS units allocated to the energy storage system under test and the number of cross-connect modules allocated to the energy storage system under test.

[0012] Preferably, centralized configuration parameters are obtained based on specification information, specifically including: Determine if the maximum power of the energy storage system under test is within the preset centralized system test power range; if not, end the test; if yes, determine if the maximum power of a single energy storage unit is less than or equal to the maximum supported power of a single PCS unit; if not, end the test; if yes, divide the maximum power of the energy storage system under test by the maximum power of a single energy storage unit to obtain the number of energy storage units; determine if the number of energy storage units is greater than the number of PCS units in a single support device; if not, end the test; if yes, assign a separate PCS unit to each energy storage unit, and the number of PCS units allocated to the energy storage system under test is the number of energy storage units; based on the number of PCS units, determine the number of parallel modules allocated to the energy storage system under test.

[0013] Preferably, according to the centralized configuration parameters, a matching device corresponding to the number of energy storage systems under test is selected for configuration. Specifically, this includes: selecting a matching device corresponding to the number of energy storage systems under test as the main matching device; according to the centralized configuration parameters, closing the second electric switch between the parallel modules allocated to the energy storage systems under test in the main matching device, closing the first electric switch corresponding to the last parallel module allocated to the energy storage systems under test, opening the first electric switches corresponding to the remaining parallel modules allocated to the energy storage systems under test; and opening all the third electric switches within the parallel modules allocated to the energy storage systems under test.

[0014] Secondly, the present invention also proposes a modular energy storage system testing method, which utilizes the modular energy storage system testing platform described in any one of the first aspects, comprising: Obtain the specifications of the energy storage system under test; Based on the specifications, determine whether the energy storage system under test is a string energy storage system; if so, obtain the string configuration parameters based on the specifications; if not, obtain the centralized configuration parameters based on the specifications. Based on the string configuration parameters or the centralized configuration parameters, the test console selects and configures the corresponding support device for the number of energy storage systems under test; After the energy storage system under test is installed in the configured support device, the test console uses the support device to test the energy storage system under test and obtain the test results.

[0015] The modular energy storage system testing platform and method proposed in this invention can automatically configure the testing fixtures of the corresponding specifications according to the specifications and characteristics of the energy storage system under test. During the testing process, while ensuring the electrical safety of the plant, the entire set of testing items is completed in an automated manner, realizing automation, saving costs and avoiding problems and risks after leaving the plant. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the modular energy storage system test platform in one embodiment of the present invention.

[0017] Figure 2 This is a schematic diagram of the support device in one embodiment of the present invention.

[0018] Figure 3 This is a schematic diagram of the intersection and merging module in one embodiment of the present invention. Detailed Implementation

[0019] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0020] Firstly, such as Figures 1-3 The present invention proposes a modular energy storage system test platform, comprising at least one support device; wherein the support device comprises: n parallel modules, n transformer modules, n first electric switches, and n-1 second electric switches; the n parallel modules are connected one-to-one with the n transformer modules, the n first electric switches are connected one-to-one between the n parallel modules and the corresponding transformer modules, and the connection point between each parallel module and the corresponding first electric switch is connected to the next adjacent parallel module through a second electric switch; Each AC-parallel module includes m energy storage converter (PCS) units and m-1 third electric switches; the first end of each PCS unit is connected to the first electric switch and the second electric switch corresponding to the AC-parallel module, and the second end is used to connect to the battery cluster RACK; and the second ends of any two adjacent PCS units are connected through a third electric switch.

[0021] The transformer module is used to connect to the power grid, and the AC / parallel module is used to connect to the energy storage system under test.

[0022] This invention greatly expands the application scope by setting up a support device structure. It can be applied to energy storage systems of different specifications, as well as string energy storage systems and centralized energy storage systems. Moreover, the switching of the internal circuit connection structure of the test platform can be automatically completed by controlling the support device, without the need for manual configuration and modification, which effectively improves the testing efficiency.

[0023] In this embodiment, the first electric switches are sequentially denoted as K11, K12, ..., K1n, the second electric switches are sequentially denoted as K21, K22, ..., K2(n-1), and the third electric switches are sequentially denoted as K31, K32, ..., K3(m-1). Figure 2 and Figure 3 As shown.

[0024] The pairing device in this embodiment can be used for testing energy storage systems awaiting shipment, and can also be used for testing between pairing devices. Depending on actual needs, one or two are selected as the primary pairing devices for testing, with the rest serving as backup pairing devices.

[0025] This embodiment also includes a test console, and the first electric switch, the second electric switch, the third electric switch, and each PCS unit are all used to communicate with the test console. The test console is used to control the coordinated operation of each electric switch and each PCS unit in at least one pair of devices to achieve the test of a string energy storage system or a centralized energy storage system.

[0026] In a further embodiment, it also includes: a communication bus and a control bus, wherein the test console, the first electric switch, the second electric switch and the third electric switch are all connected to the control bus, and the test console and each PCS unit are all connected to the communication bus.

[0027] In one embodiment, the system further includes a reverse current device, with each transformer module connected to the reverse current device. The reverse current device is connected to the power grid to prevent power from flowing back into the grid during the test, thus avoiding grid penalties. The reverse current device is connected to the test control console via a signal line.

[0028] During the coordinated operation, the test console acquires the specification information of the energy storage system under test; based on the specification information of the energy storage system under test, it determines whether the energy storage system is a string energy storage system; if so, it obtains the string configuration parameters based on the specification information of the energy storage system under test; if not, it obtains the centralized configuration parameters based on the specification information of the energy storage system under test. Based on the string configuration parameters or the centralized configuration parameters, the test console selects and configures the corresponding support device for the number of energy storage systems under test; After the energy storage system under test is installed in the configured support device, the test console uses the support device to test the energy storage system under test and obtain the test results.

[0029] After obtaining the test results, the test console is also used to determine whether the test has passed based on the test results; if yes, the energy storage system is considered qualified; if no, the energy storage system is deemed unqualified.

[0030] It should be understood that the energy storage system under test in this embodiment includes multiple parallel energy storage units, each energy storage unit includes multiple parallel battery clusters (RACK), and each battery cluster includes multiple series-connected battery packs (PACK).

[0031] When the energy storage system under test is a string energy storage system, multiple energy storage units have the same specifications, multiple battery clusters (RACKs) within a single energy storage unit have the same specifications, and each battery cluster (RACK) within a single energy storage unit requires a separate PCS unit. Therefore, when setting up a string energy storage system, each parallel module has the same specifications, and each PCS unit has the same specifications.

[0032] When the energy storage system under test is a centralized energy storage system, all battery clusters (RACKs) within a single energy storage unit must be connected to the same PCS unit. In a centralized energy storage system, the energy storage units have the same specifications; the specifications of the battery clusters (RACKs) within an energy storage unit can be the same or different. Therefore, when testing a centralized energy storage system, the specifications of the PCS unit in this embodiment are set according to actual needs. The PCS units within each parallel module can be the same or different to support mixed testing.

[0033] The specifications of the energy storage system under test include: system type, rated power, rated capacity, AC rated voltage, maximum power, and rated power and maximum power of the energy storage unit; the system type is divided into string type and centralized type.

[0034] When testing a string energy storage system, we first assume that the maximum power of the string energy storage system is P. 储能系统 The maximum power of a single energy storage unit is P. 储能单元 The maximum power of a single PCS is P pcs If the number of PCS within a single AC / parallel module is m, meaning a single AC / parallel module can support a maximum of m DC-side parallel units, then the maximum supported power of each AC / parallel module is m*P. pcs The maximum support power of a single support device is n*m*P pcs In this embodiment, * should be understood as a multiplication sign.

[0035] The string configuration parameters in this embodiment include: the number and order of the cross-parallel modules allocated to the energy storage system under test in the support device, the number and order of the cross-parallel modules allocated to each energy storage unit, and the number and order of the PCS units allocated to the corresponding energy storage unit in each cross-parallel module, and each battery cluster in each energy storage unit is allocated one PCS unit.

[0036] In this embodiment, the string configuration parameters are obtained based on the specification information, specifically including: Determine if the maximum power of the energy storage system under test is greater than the maximum support power of a single parallel device; if yes, end the test; if no, divide the maximum power of the energy storage system under test by the maximum power of a single energy storage unit to obtain the number of energy storage units y; determine if the number of energy storage units y is greater than the number of parallel modules n; if yes, end the test; if no, for a single energy storage unit, determine if the maximum power of the single energy storage unit is less than or equal to the maximum support power of a single parallel module; if yes, use the first y parallel modules as the parallel modules allocated to the energy storage unit, with each energy storage unit corresponding to one parallel module; divide the maximum power of a single energy storage unit by the maximum power of a single PCS unit to obtain the number of PCS units x, and then allocate the first x PCS units in each parallel module to the corresponding energy storage unit, with each battery cluster of the energy storage unit corresponding to one PCS unit; If not, divide the maximum power of a single energy storage unit by the maximum supported power of a single AC-parallel module to obtain the quotient r and the remainder P. 余 ; the remainder P 余 Divide by the maximum power of a single PCS unit to obtain the number of PCS units x; determine the number of parallel modules allocated to the energy storage system under test as y*(r+1); Determine if y*(r+1)>n is satisfied; if yes, end; if no, use the first y*(r+1) cross-connect modules as cross-connect modules to be assigned to the energy storage system under test; divide the first y*(r+1) cross-connect modules into y groups, and use the r+1 cross-connect modules in each group as cross-connect modules to be assigned to each energy storage unit. All PCS units in the first r cross-connect modules corresponding to each energy storage unit are assigned to the corresponding energy storage unit. The first x PCS units in the (r+1)th cross-connect module corresponding to each energy storage unit are assigned to the corresponding energy storage unit. Each battery cluster in each energy storage unit is assigned one PCS unit. PCS units and cross-connect modules not assigned to the energy storage system under test are in an idle state.

[0037] In this embodiment, based on the string configuration parameters, a matching support device corresponding to the number of energy storage systems under test is selected and configured, specifically including: Select a support device corresponding to the number of energy storage systems to be tested as the main support device; According to the string configuration parameters, the first electric switches corresponding to the parallel modules of the main parallel device allocated to the energy storage system under test are all closed; the second electric switches between the parallel modules allocated to the energy storage system under test are all opened; and the third electric switches between the PCS units allocated to the corresponding energy storage units in a single parallel module are all closed.

[0038] When testing a centralized energy storage system, it is assumed that the maximum power of each PCS unit in each cross-connect module is PCS. i , i=1~m, where m is the total number of PCS units.

[0039] Therefore, the minimum supported test power of a single cross-connect module Maximum supported test power Maximum supported test power for demodule The minimum supported power for demodulation is The maximum power of the transformer module is , where q is any q-th transformer module from 1 to n.

[0040] The centralized configuration parameters in this embodiment include: the number of PCS units allocated to the energy storage system under test and the number of cross-connect modules allocated to the energy storage system under test.

[0041] In this embodiment, centralized configuration parameters are obtained based on specification information, specifically including: Determine whether the maximum power of the energy storage system under test is within the preset centralized system test power range; if not, end; if yes, determine whether the maximum power of a single energy storage unit is less than or equal to the maximum supported power range of a single PCS unit; if not, end; if yes, divide the maximum power of the energy storage system under test by the maximum power of a single energy storage unit to obtain the number of energy storage units. Determine if the number of energy storage units is greater than the number of PCS units in a single pair of support devices; if yes, end the process; if no, assign a separate PCS unit to each energy storage unit, and the number of PCS units allocated to the energy storage system under test is the number of energy storage units; based on the number of PCS units, determine the number of parallel modules allocated to the energy storage system under test.

[0042] The preset centralized system test power range is the minimum support test power for module removal. and maximum supported test power between.

[0043] It is important to understand that the minimum power module supported by the parallel module in this embodiment is one cross-connect module. That is, when the first PCS unit in the first cross-connect module is assigned to the energy storage system under test, the test console controls the connection of the first cross-connect module, causing one second electric switch K21 to open and the corresponding first electric switch K11 to close, while all third electric switches in the cross-connect module are opened; this constitutes the minimum centralized energy storage system test power module. .

[0044] In this embodiment, the parallel module also supports a maximum of n parallel modules for testing. That is, all n parallel modules are allocated to the energy storage system under test, with each energy storage unit corresponding to one PCS unit. The test console controls all second electric switches K21~K2(n-1) to close, controls the first n-1 first electric switches K11~K1(n-1) to open, and controls the nth first electric switch K1n to close. This represents the maximum centralized energy storage system test power module. .

[0045] In this embodiment, based on centralized configuration parameters, a support device corresponding to the number of energy storage systems under test is selected and configured, specifically including: Select a support device corresponding to the number of energy storage systems under test as the main support device; according to the centralized configuration parameters, the test control console closes the second electric switch between the parallel modules of the corresponding energy storage system under test in the main support device, closes the first electric switch corresponding to the last parallel module of the energy storage system under test, and opens the first electric switch corresponding to the remaining parallel modules of the energy storage system under test; and opens all the third electric switches in the parallel modules of the energy storage system under test.

[0046] In the process of using two parallel support devices to conduct parallel support tests on two energy storage systems under test, the test control console is used to control one of the main parallel support devices to be in a charging state and the other main parallel support device to be a discharging device.

[0047] During the test, the test console is also used to acquire the status parameters of each battery cluster in the energy storage system under test; adjust the power and temperature curves of the corresponding PCS unit according to the status parameters of each battery cluster, and simultaneously ensure that the reverse flow device does not discharge to the grid.

[0048] During testing, the test console is also used to acquire the real-time power of each transformer module, and when the real-time power of a transformer module exceeds the preset transformer power threshold, it controls the PCS unit under that transformer module to reduce power to ensure that the power of the transformer module is not overloaded.

[0049] This embodiment can test different battery configurations, different PCS configurations, different transformer module configurations, and perform loop-in testing on string energy storage systems and centralized energy storage systems.

[0050] This invention can automatically configure test fixtures of corresponding specifications according to the characteristics of the energy storage system under test; during the testing process, while ensuring electrical safety in the factory, the entire set of test items is completed in an automated manner, realizing automation, saving costs and avoiding problems and risks after leaving the factory.

[0051] Secondly, the present invention also proposes a modular energy storage system testing method, which utilizes the modular energy storage system testing platform described in any one of the first aspects of the claims, comprising: Obtain the specifications of the energy storage system under test; based on the specifications of the energy storage system under test, determine whether the energy storage system under test is a string energy storage system; if so, obtain the string configuration parameters based on the specifications of the energy storage system under test; if not, obtain the centralized configuration parameters based on the specifications. Based on the string configuration parameters or the centralized configuration parameters, select the corresponding support device for the number of energy storage systems under test; After installing the energy storage system under test in the configured support device, the two support devices are used to perform a support test on the energy storage system under test, and the test results are obtained.

[0052] In this embodiment, after obtaining the test results, the method further includes: determining whether the test has passed based on the test results; if yes, the energy storage system is considered qualified; if no, the energy storage system is deemed unqualified.

[0053] In a further embodiment, after the energy storage system is determined to be unqualified, the energy storage system is rectified, and after the rectification is completed, it is retested, and this process is repeated until the energy storage system is qualified.

[0054] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A modular energy storage system test platform, characterized in that, include: Test console and at least one counter-attack device; The device includes: n parallel modules and n transformer modules for connecting to the power grid. The n parallel modules are connected to the n transformer modules in a one-to-one correspondence. Each parallel module is connected to its corresponding transformer module by a first electric switch. The connection point between each parallel module and its corresponding first electric switch is connected to the next adjacent parallel module by a second electric switch. Each of the cross-parallel modules includes m PCS units; the first end of each PCS unit is connected to the first and second electric switches corresponding to the cross-parallel module, and the second end is used to connect to the battery cluster; and a third electric switch is connected between the second ends of any two adjacent PCS units. Each electric switch and PCS unit is connected to the test console, which is used to control the coordinated operation of each electric switch and PCS unit in at least one pair of devices to achieve the test of a string energy storage system or a centralized energy storage system.

2. The modular energy storage system test platform according to claim 1, characterized in that, During the coordinated operation, the test console acquires the specification information of the energy storage system under test; based on the specification information, it determines whether the energy storage system under test is a string energy storage system; if so, it obtains the string configuration parameters based on the specification information; if not, it obtains the centralized configuration parameters based on the specification information; based on the string configuration parameters or the centralized configuration parameters, it selects the corresponding support device for the number of energy storage systems under test for configuration. After the energy storage system under test is installed in the configured support device, the test console uses the support device to test the energy storage system under test and obtain the test results.

3. The modular energy storage system test platform according to claim 2, characterized in that, Specifications include: system type, rated power, rated capacity, AC rated voltage, maximum power of the energy storage system, and rated power and maximum power of the energy storage unit; among which, the system type is divided into two types: string type and centralized type.

4. The modular energy storage system test platform according to claim 2, characterized in that, The string configuration parameters include: the number and order of the cross-parallel modules allocated to the energy storage system under test, the number and order of the cross-parallel modules allocated to each energy storage unit, and the number and order of the PCS units allocated to the corresponding energy storage unit in each cross-parallel module, with each battery cluster in each energy storage unit being allocated one PCS unit.

5. The modular energy storage system test platform according to claim 3 or 4, characterized in that, Based on the specification information, the string configuration parameters are obtained, specifically including: Determine whether the maximum power of the energy storage system under test is greater than the maximum support power of a single support device; if yes, end the test; if no, divide the maximum power of the energy storage system under test by the maximum power of a single energy storage unit to obtain the number of energy storage units y. Determine if the number of energy storage units y is greater than the number of AC / parallel modules n; if yes, end; if no, for a single energy storage unit, determine if the maximum power of the single energy storage unit is less than or equal to the maximum supported power of the single AC / parallel module. If so, the first y parallel modules are used as parallel modules to be allocated to the energy storage unit, with each energy storage unit corresponding to one parallel module; the maximum power of a single energy storage unit is divided by the maximum power of a single PCS unit to obtain the number of PCS units x, and the first x PCS units in each parallel module are allocated to the corresponding energy storage unit, with each battery cluster corresponding to one PCS unit. If not, divide the maximum power of a single energy storage unit by the maximum supported power of a single AC-parallel module to obtain the quotient r and the remainder P. 余 ; the remainder P 余 Divide by the maximum power of a single PCS unit to obtain the number of PCS units x; determine the number of cross-connect modules allocated to the energy storage system under test as y*(r+1); determine whether y*(r+1)>n is satisfied; if yes, end; if no, use the first y*(r+1) cross-connect modules as the cross-connect modules allocated to the energy storage system under test; divide the first y*(r+1) cross-connect modules into y groups, and use the r+1 cross-connect modules in each group as the cross-connect modules allocated to each energy storage unit. All PCS units in the first r cross-connect modules corresponding to each energy storage unit are allocated to the corresponding energy storage unit. The first x PCS units in the (r+1)th cross-connect module corresponding to each energy storage unit are allocated to the corresponding energy storage unit. Each battery cluster in each energy storage unit is allocated one PCS unit.

6. The modular energy storage system test platform according to claim 2, characterized in that, Based on the string configuration parameters, select and configure the corresponding support devices for the number of energy storage systems under test, specifically including: Select a pair of support devices corresponding to the number of energy storage systems under test as the main pair of support devices; according to the string configuration parameters, close all the first electric switches corresponding to the parallel modules of the energy storage systems under test in the main pair of support devices; open all the second electric switches between the parallel modules of the energy storage systems under test; and close all the third electric switches between the PCS units of the corresponding energy storage units in a single parallel module.

7. The modular energy storage system test platform according to claim 2, characterized in that, The centralized configuration parameters include: the number of PCS units allocated to the energy storage system under test and the number of cross-connect modules allocated to the energy storage system under test.

8. The modular energy storage system test platform according to claim 2 or 7, characterized in that, Based on the specifications, the centralized configuration parameters are obtained, including: Determine if the maximum power of the energy storage system under test is within the preset centralized system test power range; if not, end the test; if yes, determine if the maximum power of a single energy storage unit is less than or equal to the maximum supported power of a single PCS unit; if not, end the test; if yes, divide the maximum power of the energy storage system under test by the maximum power of a single energy storage unit to obtain the number of energy storage units; determine if the number of energy storage units is greater than the number of PCS units in a single support device; if yes, end the test; if not, assign a separate PCS unit to each energy storage unit, and the number of PCS units allocated to the energy storage system under test is the number of energy storage units; based on the number of PCS units, determine the number of parallel modules allocated to the energy storage system under test.

9. The modular energy storage system test platform according to claim 3, characterized in that, Based on the centralized configuration parameters, a support device corresponding to the number of energy storage systems under test is selected and configured. Specifically, this includes: selecting a support device corresponding to the number of energy storage systems under test as the main support device; according to the centralized configuration parameters, closing the second electric switch between the parallel modules allocated to the energy storage systems under test in the main support device, closing the first electric switch corresponding to the last parallel module allocated to the energy storage systems under test, opening the first electric switches corresponding to the remaining parallel modules allocated to the energy storage systems under test; and opening all the third electric switches within the parallel modules allocated to the energy storage systems under test.

10. A testing method for a modular energy storage system, using the modular energy storage system testing platform described in any one of claims 1-9, characterized in that, include: Obtain the specifications of the energy storage system under test; Based on the specifications, determine whether the energy storage system under test is a string energy storage system; If yes, then the serial configuration parameters are obtained based on the specification information; if no, then the centralized configuration parameters are obtained based on the specification information. Based on the string configuration parameters or the centralized configuration parameters, select the corresponding support device for the number of energy storage systems under test; After the energy storage system under test is installed in the configured support device, the support device is used to test the energy storage system under test and obtain the test results.

Images