Test platform for testing power of energy storage product

Abstract

The utility model provides a test platform for testing the power of an energy storage product. The test platform comprises a controller, at least one isolation transformer and N types of test circuits. N is an integer greater than or equal to 2; each test circuit comprises a switching unit and a test unit which are connected in sequence; each test circuit is connected to the corresponding isolation transformer through the switching unit; the isolation transformer is connected with a corresponding matched target power supply; the controller is used for controlling the switching unit to be switched on and switched off, so that the test circuit is connected to a corresponding matched target power supply, and an energy storage product connected with the test unit is tested; wherein each test circuit correspondingly tests one type of energy storage product. The test platform can test a plurality of container energy storage products and a plurality of non-container energy storage products at the same time, the occupied area is small, and factory test is facilitated; and the system can also be used as an energy storage power station for off-grid power test during power loss.

Description

Technical Field

[0001] This disclosure relates to the field of power energy storage technology, and in particular to a test platform for power testing of energy storage products. Background Technology

[0002] In recent years, in order to achieve the dual carbon goals of peaking carbon emissions by 2030 and achieving carbon neutrality by 2060, the installed capacity of zero-carbon energy sources such as photovoltaic and wind power has increased rapidly. Due to the volatility and cyclical nature of new energy sources such as photovoltaic and wind power, their output is uneven and uncontrollable, thus requiring energy storage power stations to perform peak shaving and valley filling. With the continuous expansion of energy storage demand and the continuous reduction in the unit cost of electrochemical energy storage systems, electrochemical energy storage products have become an important part of the energy storage industry, and related demand is growing rapidly.

[0003] Electrochemical energy storage products vary in specifications and external interfaces depending on their product type and application scenario. Commercial and industrial outdoor energy storage cabinets, suitable for industrial and commercial energy storage, can be categorized into integrated cabinets with 1000Vdc DC and 400Vac AC output, pure DC cabinets with 1500Vdc DC output, and integrated cabinets with 1500Vdc DC and 690Vac AC output. Large-scale energy storage products, depending on their positioning, can also be categorized into DC-side energy storage containers with 1500Vdc or 1000Vdc output, and AC / DC integrated energy storage containers with 1500Vdc DC and 690Vac AC output or 1000Vdc DC and 400Vac AC output.

[0004] Given that more and more homeowners now prefer products to be delivered to their sites for installation and wiring before operation, pre-shipment charge / discharge testing is crucial. Currently, major manufacturers on the market build dedicated testing platforms for their specific energy storage products, enabling full-power charge / discharge testing.

[0005] However, certain types of energy storage products can only be tested at specific fixed workstations. For example, 1000V DC low-voltage energy storage containers and 1500V DC energy storage containers cannot share a test station, and the test station for pure DC-side energy storage containers cannot be shared with AC / DC integrated energy storage containers. Building separate test stations for different product types would require a large footprint, significant investment, and is prone to being idle, resulting in resource waste. On the other hand, adapting to on-site testing requirements would be costly and time-consuming, and different energy storage products would require multiple modifications for factory testing, leading to waste and impacting project delivery time. Furthermore, factory testing of energy storage products is impossible during voltage-side power outages or power failures in the factory. Utility Model Content

[0006] The technical problem to be solved by this disclosure is to overcome the shortcomings of the prior art and provide a test platform for power testing of energy storage products.

[0007] This disclosure solves the above-mentioned technical problems through the following technical solution:

[0008] This disclosure provides a test platform for power testing of energy storage products. The test platform includes a controller, at least one isolation transformer, and N types of test circuits; N ≥ 2 and is an integer.

[0009] Each of the test circuits includes a switching unit and a test unit connected in sequence;

[0010] Each of the test circuits is connected to the corresponding isolation transformer via the switching unit; the isolation transformer is connected to the corresponding matched target power supply;

[0011] The controller is used to control the closing of the switching unit so that the test circuit can be connected to the corresponding matching target power supply to test the energy storage product connected to the test unit.

[0012] Each of the test circuits corresponds to testing one type of energy storage product.

[0013] Preferably, the test platform includes a first isolation transformer and a second isolation transformer, both of which are connected to a power supply.

[0014] The N types of test circuits include a first test circuit and a second test circuit;

[0015] The switching unit of the first test circuit includes a first circuit breaker, the test unit of the first test circuit includes a first test unit, and the first test circuit further includes an energy storage converter. The first circuit breaker, the energy storage converter, and the first test unit are connected in sequence.

[0016] The switching unit of the second test circuit includes a second circuit breaker and a third circuit breaker, and the test unit of the second test circuit includes a second test unit;

[0017] The first test circuit is connected to the first isolation transformer via the first circuit breaker;

[0018] The second test circuit is connected to the first isolation transformer via the second circuit breaker, and the second test circuit is connected to the second isolation transformer via the third circuit breaker;

[0019] The controller is also used to control the first circuit breaker to close, so that the first test circuit can be connected to the first target power source to perform power testing on the first type of energy storage product connected to the first test unit.

[0020] The controller is also used to control the second circuit breaker to close, so that the second test circuit can be connected to the first target power source to perform power testing on the second type of energy storage product connected to the second test unit; or, the controller is used to control the third circuit breaker to close, so that the second test circuit can be connected to the second target power source to perform power testing on the third type of energy storage product connected to the second test unit.

[0021] Preferably, the N types of test circuits further include a third test circuit;

[0022] The switching unit of the third test circuit includes a fourth circuit breaker, the test unit of the third test circuit includes a third test unit, and the third test circuit also includes a third isolation transformer. The fourth circuit breaker, the third isolation transformer, and the third test unit are connected in sequence.

[0023] The third test circuit is connected to the first isolation transformer via the fourth circuit breaker;

[0024] The controller is also used to control the fourth circuit breaker to close, so that the third test circuit can be connected to the first target power source to perform power testing on the fourth type of energy storage product connected to the third test unit.

[0025] And / or,

[0026] The N types of test circuits also include a fourth test circuit;

[0027] The switching unit of the fourth test circuit includes a fifth circuit breaker, the test unit of the fourth test circuit includes a fourth test unit, and the fourth test circuit also includes a fourth isolation transformer. The fifth circuit breaker, the fourth isolation transformer, and the fourth test unit are connected in sequence.

[0028] The fourth test circuit is connected to the second isolation transformer via the fifth circuit breaker;

[0029] The controller is also used to control the closing of the fifth circuit breaker so that the fourth test circuit can be connected to the second target power source to perform power testing on the fifth type of energy storage product connected to the fourth test unit.

[0030] Preferably, the test platform further includes a first busbar section, a second busbar section, a sixth circuit breaker, and a seventh circuit breaker;

[0031] The first isolation transformer, the sixth circuit breaker, and the first busbar section are connected in sequence to connect to the first target power source.

[0032] The second isolation transformer, the seventh circuit breaker, and the second bus section are connected in sequence to connect to the second target power source;

[0033] The first test circuit is connected to the first bus section via the first circuit breaker;

[0034] The second test circuit is connected to the first bus section via the second circuit breaker and to the second bus section via the third circuit breaker;

[0035] The third test circuit is connected to the first bus section via the fourth circuit breaker.

[0036] The fourth test circuit is connected to the second bus section via the fifth circuit breaker;

[0037] The controller is also configured to control the closing of the sixth circuit breaker to connect the first bus section to the first target power supply, and / or the controller is also configured to control the closing of the seventh circuit breaker to connect the second bus section to the second target power supply.

[0038] Preferably, the number of the first busbar segment, the first test circuit, and the second test circuit is greater than or equal to 1.

[0039] Preferably, the first test circuit further includes a first DC switch and a second DC switch;

[0040] The first circuit breaker, the energy storage converter, the first DC switch, and the first test unit are connected in sequence.

[0041] One end of the second DC switch is connected in parallel with the first DC switch to the energy storage converter, and the other end of the second DC switch is connected to the battery container.

[0042] The controller is also used to control the first circuit breaker and the first DC switch to close, so that the first test circuit can perform a power test on the first type of energy storage product; or, the controller is also used to control the first circuit breaker and the second DC switch to close, so that the first test circuit can store energy into the battery container.

[0043] Preferably, an electrical interlock is provided between the first DC switch and the second DC switch;

[0044] The electrical interlock is used to control the different operating states of the first DC switch and the second DC switch.

[0045] Preferably, the first isolation transformer includes a three-winding transformer, the second isolation transformer includes a two-winding transformer; and / or, the voltages of the first target power supply and the second target power supply are different.

[0046] Preferably, the test platform is used to perform full-power tests on energy storage products.

[0047] Preferably, the first test unit includes a DC wiring cabinet, which is used to connect to a pure DC energy storage container with a first voltage output;

[0048] And / or,

[0049] The second test unit includes an AC wiring cabinet, which is used to connect to an AC / DC integrated container with a second voltage output or an AC / DC integrated container with a third voltage output.

[0050] And / or,

[0051] The third test unit includes a first wiring cabinet, which is used to connect a pure DC non-container with a first voltage output and / or an AC / DC integrated non-container with a second voltage output.

[0052] And / or,

[0053] The fourth test unit includes a second wiring cabinet, which is used to connect to an AC / DC integrated non-container with a third voltage output.

[0054] Based on common knowledge in the field, the preferred conditions described can be combined arbitrarily to obtain the preferred embodiments of this disclosure.

[0055] The positive and progressive effects of this disclosure are as follows: This testing platform can perform full-power charge and discharge tests on various types of energy storage products currently on the market and in the future. It can simultaneously test multiple containerized energy storage products and multiple non-containerized energy storage products. It also has a small footprint, low investment cost, and allows for the sharing of a large number of devices. It is easy to use, requires minimal preparation for on-site testing, and facilitates factory testing to understand the performance of shipped products. In addition, when there is a spare DC testing station, the testing platform can be used to connect the energy storage converter to the corresponding battery container through DC switch switching operations, thus using the testing platform as an energy storage power station. When the grid loses power, it can establish an off-grid connection by connecting the battery container to the corresponding energy storage converter, thereby realizing charge and discharge testing of containerized and non-containerized energy storage products. Attached Figure Description

[0056] Figure 1 This is the first circuit diagram of the test platform for power testing of the energy storage products disclosed herein;

[0057] Figure 2This is the second circuit diagram of the test platform for power testing of the energy storage products disclosed herein;

[0058] Figure 3 This is the third circuit diagram of the test platform for power testing of the energy storage products disclosed herein;

[0059] Figure 4 This is the fourth circuit diagram of the test platform for power testing of the energy storage products disclosed herein;

[0060] Figure 5 This is the fifth circuit diagram of the test platform for power testing of the energy storage products disclosed herein;

[0061] Figure 6 This is the sixth circuit diagram of the test platform for power testing of the energy storage products disclosed herein. Detailed Implementation

[0062] The present disclosure will be explained more clearly and completely below with reference to a preferred embodiment and the accompanying drawings.

[0063] Example 1

[0064] In one specific embodiment of this disclosure, a test platform for power testing of energy storage products is provided, such as... Figure 1 As shown, the test platform includes a controller (not shown in the figure), at least one isolation transformer 1, and N types of test circuits 2; N ≥ 2 and is an integer.

[0065] Each test circuit 2 includes a switching unit and a test unit connected in sequence;

[0066] Each test circuit 2 is connected to the corresponding isolation transformer 1 via a switching unit; the isolation transformer 1 is connected to the corresponding matching target power supply;

[0067] The controller is used to control the closing of the switching unit so that the test circuit 2 can be connected to the corresponding target power supply to test the energy storage product connected to the test unit.

[0068] Each test circuit 2 corresponds to testing one type of energy storage product.

[0069] Specifically, to enable the energy storage product testing platform to be suitable for the power factory testing of both containerized and non-containerized energy storage products (e.g., commercial and industrial containerized energy storage products) in the current and future years, an isolation transformer 1 can be connected to the corresponding target power supply and test circuit 2 to achieve isolation for each type of test circuit 2. During the testing process, the controller controls the closing of the switching unit of the corresponding test circuit 2 to test the energy storage product connected to the test unit. This ensures that the testing of non-containerized energy storage products will not affect the testing of containerized energy storage products, meeting the simultaneous testing needs of multiple types of energy storage products. Furthermore, during the testing process, it is only necessary to connect the energy storage product to be tested to the corresponding test unit and perform the opening and closing operation of the switching unit through the controller to conduct the test, reducing the preparation work required for on-site testing and improving overall efficiency.

[0070] The types of energy storage products may include commercial AC / DC integrated cabinet products with 400Vac output, industrial and commercial AC / DC integrated cabinet products with 690Vac output, pure DC industrial and commercial cabinet products with 1500Vdc output, containerized AC / DC integrated products with 400Vac output, containerized AC / DC integrated products with 690Vac output, containerized AC / DC integrated products with 1500Vdc output, etc. The corresponding test circuit 2 can be set according to the actual energy storage product. This embodiment does not make specific limitations on this.

[0071] In one specific implementation, such as Figure 2 As shown, the test platform includes a first isolation transformer 11 and a second isolation transformer 12, both of which are connected to a power supply.

[0072] The N types of test circuits 2 include a first test circuit 21 and a second test circuit 22;

[0073] The switching unit of the first test circuit 21 includes a first circuit breaker 211, the test unit of the first test circuit 21 includes a first test unit 213, and the first test circuit 21 also includes an energy storage converter 212. The first circuit breaker 211, the energy storage converter 212 and the first test unit 213 are connected in sequence.

[0074] The switching unit of the second test circuit 22 includes a second circuit breaker 221 and a third circuit breaker 222, and the test unit of the second test circuit 22 includes a second test unit 223.

[0075] The first test circuit 21 is connected to the first isolation transformer 11 via the first circuit breaker 211;

[0076] The second test circuit 22 is connected to the first isolation transformer 11 via the second circuit breaker 221, and the second test circuit 22 is connected to the second isolation transformer 12 via the third circuit breaker 222.

[0077] The controller is also used to control the first circuit breaker 211 to close so that the first test circuit 21 is connected to the first target power source to perform power testing on the first type of energy storage product connected to the first test unit 213.

[0078] The controller is also used to control the second circuit breaker 221 to close, so that the second test circuit 22 is connected to the first target power source to perform power testing on the second type of energy storage product connected to the second test unit 223; or, the controller is used to control the third circuit breaker 222 to close, so that the second test circuit 22 is connected to the second target power source to perform power testing on the third type of energy storage product connected to the second test unit 223.

[0079] Specifically, the high-voltage side of the first isolation transformer 11 is connected to the factory's 10KV bus (i.e., power supply), and the low-voltage side is connected to one branch of the first test circuit 21 and the second test circuit 22 (the second circuit breaker 221) to output a voltage of 690Vac (i.e., the first target power supply); the high-voltage side of the second isolation transformer 12 is connected to the factory's 10KV bus, and the low-voltage side is connected to another branch of the second test circuit 22 (the third circuit breaker 222) to output a voltage of 400Vac (i.e., the second target power supply).

[0080] Since the AC / DC integrated container outputs AC power, it can be directly connected to the AC bus of the corresponding voltage level. However, the pure DC energy storage container outputs DC power and must be converted from DC to AC by a PCS before it can be connected to the AC bus. Therefore, in order for the first test circuit 21 to perform full-power testing on the pure DC energy storage container with the first voltage output (e.g., a pure DC energy storage container with a 1500Vdc output), the first test circuit 21 also includes a PCS (i.e., energy storage converter 212, e.g., a 2500kVA PCS). When the controller controls the first circuit breaker 211 to close, the PCS performs DC-AC conversion, enabling the first test circuit 21 to perform full-power testing on the pure DC energy storage container with the first voltage output connected to the first test unit 213 (DC junction box). Power testing; when the controller controls the second circuit breaker 221 to close, the second test circuit 22 can perform a full-power test on the AC / DC integrated container (e.g., an AC / DC integrated container product with 690Vac output) connected to the second test unit 223 (AC junction box); when the controller controls the third circuit breaker 222 to close, the second test circuit 22 can perform a full-power test on the AC / DC integrated container (e.g., an AC / DC integrated container product with 400Vac output) connected to the second test unit 223 with the third voltage output.

[0081] Since the first isolation transformer 11 outputs the first target power supply voltage and the second isolation transformer 12 outputs the second target power supply voltage, the second circuit breaker 221 and the third circuit breaker 222 cannot be closed at the same time, otherwise there will be a risk of short circuit.

[0082] In one specific implementation, such as Figure 3 As shown, the N-type test circuit 2 also includes a third test circuit 23;

[0083] The switching unit of the third test circuit 23 includes a fourth circuit breaker 231, the test unit of the third test circuit 23 includes a third test unit 233, and the third test circuit 23 also includes a third isolation transformer 232. The fourth circuit breaker 231, the third isolation transformer 232 and the third test unit 233 are connected in sequence.

[0084] The third test circuit 23 is connected to the first isolation transformer 11 via the fourth circuit breaker 231;

[0085] The controller is also used to control the closing of the fourth circuit breaker 231 so that the third test circuit 23 is connected to the first target power source to perform power testing on the fourth type of energy storage product connected to the third test unit 233.

[0086] Specifically, to enable non-containerized and containerized energy storage products to share a single testing platform, a third isolation transformer 232 (e.g., a 400kVA isolation transformer 1) is included in the third testing circuit 23. Its primary side is connected to the first isolation transformer 11 via a fourth circuit breaker 231, and its secondary side is connected to a first junction box. This first junction box can connect to a non-containerized AC / DC integrated product with a second voltage output (e.g., a 690Vac output AC / DC integrated commercial / industrial cabinet product). Furthermore, to meet the testing needs of more energy storage product types, the first junction box also houses multiple... A second voltage output, preset power module PCS (e.g., multiple 690Vac output, 200kW module PCS) is placed to test the first voltage output pure DC non-containerized (e.g., 1500Vdc output pure DC industrial and commercial cabinet products). Multiple test connection interfaces in the first junction box are equipped with corresponding circuit breakers to control the on / off of the test circuit. When the controller controls the fourth circuit breaker 231 to close, the third test circuit 23 can control the corresponding circuit breaker in the first junction box to perform full-power testing on the energy storage products connected to the first junction box.

[0087] In one specific implementation, such as Figure 3 As shown, the N-type test circuit 2 also includes a fourth test circuit 24;

[0088] The switching unit of the fourth test circuit 24 includes a fifth circuit breaker 241, the test unit of the fourth test circuit 24 includes a fourth test unit 243, and the fourth test circuit 24 also includes a fourth isolation transformer 242. The fifth circuit breaker 241, the fourth isolation transformer 242 and the fourth test unit 243 are connected in sequence.

[0089] The fourth test circuit 24 is connected to the second isolation transformer 12 via the fifth circuit breaker 241;

[0090] The controller is also used to control the closing of the fifth circuit breaker 241 so that the fourth test circuit 24 is connected to the second target power source to perform power testing on the fifth type of energy storage product connected to the fourth test unit 243.

[0091] Specifically, in order to enable multiple non-containerized energy storage products and containerized energy storage products to share a single test platform, a fourth isolation transformer 242 (e.g., an 800kVA isolation transformer 1) is provided in the fourth test circuit 24. Its primary side is connected to the second isolation transformer 12 via the fifth circuit breaker 241, and its secondary side is connected to the second junction box. The second junction box can be connected to a non-containerized AC / DC integrated product with a third voltage output (e.g., a commercial cabinet product with an AC / DC integrated output of 400Vac). When the controller controls the fifth circuit breaker 241 to close, the fourth test circuit 24 can perform a full-power test on the energy storage product connected to the second junction box.

[0092] In one specific implementation, such as Figure 4 As shown, the test platform also includes a first busbar section 31, a second busbar section 32, a sixth circuit breaker 41, and a seventh circuit breaker 42;

[0093] The first isolation transformer 11, the sixth circuit breaker 41 and the first bus section 31 are connected in sequence to connect to the first target power source;

[0094] The second isolation transformer 12, the seventh circuit breaker 42, and the second busbar section 32 are connected in sequence to connect to the second target power source.

[0095] The first test circuit 21 is connected to the first bus section 31 via the first circuit breaker 211;

[0096] The second test circuit 22 is connected to the first bus section 31 via the second circuit breaker 221 and to the second bus section 32 via the third circuit breaker 222.

[0097] The third test circuit 23 is connected to the first bus section 31 via the fourth circuit breaker 231;

[0098] The fourth test circuit 24 is connected to the second bus section 32 via the fifth circuit breaker 241;

[0099] The controller is also used to control the closing of the sixth circuit breaker 41 to connect the first bus section 31 to the first target power supply, and / or, the controller is also used to control the closing of the seventh circuit breaker 42 to connect the second bus section 32 to the second target power supply.

[0100] Specifically, to simplify the circuit, the first busbar segment 31, the second busbar segment 32, the sixth circuit breaker 41, and the seventh circuit breaker 42 can be used to control the testing of various test circuits 2. By connecting the first busbar segment 31 to the first isolation transformer 11 via the sixth circuit breaker 41, and then connecting the first test circuit 21, one branch of the second test circuit 22, and the third test circuit 23 to the first busbar segment 31, connecting the second busbar segment 32 to the second isolation transformer 12 via the seventh circuit breaker 42, and then connecting the other branch of the second test circuit 22 and the fourth test circuit 24 to the second busbar segment 32, the testing of various types of energy storage products can be achieved by controlling the opening and closing operations of the sixth circuit breaker 41, the seventh circuit breaker 42, the first circuit breaker 211, the second circuit breaker 221, the third circuit breaker 222, the fourth circuit breaker 231, and the fifth circuit breaker 241.

[0101] In one specific embodiment, the number of the first busbar segment 31, the first test circuit 21, and the second test circuit 22 is greater than or equal to 1.

[0102] Specifically, to enable simultaneous testing of a larger number of energy storage products, the number of first busbar segments 31, first test circuits 21, and second test circuits 22 can be set according to actual needs. For example, the first isolation transformer 11 can be a three-winding transformer, and the second isolation transformer can be a two-winding transformer. In this case, the first isolation transformer 11 can be connected to two first busbar segments 31, and the second isolation transformer 12 can be connected to one second busbar segment 32. Of course, if the power supply can meet the requirements for simultaneous testing of more energy storage products, multiple third test circuits 23 and fourth test circuits 24 can also be set. This embodiment does not specifically limit this.

[0103] In one specific implementation, such as Figure 5 As shown, the first test circuit 21 also includes a first DC switch 214 and a second DC switch 215;

[0104] The first circuit breaker 211, the energy storage converter 212, the first DC switch 214 and the first test unit 213 are connected in sequence;

[0105] One end of the second DC switch 215 is connected in parallel with the first DC switch 214 to the energy storage converter 212, and the other end of the second DC switch 215 is connected to the battery container 216.

[0106] The controller is also used to control the first circuit breaker 211 and the first DC switch 214 to close so that the first test circuit 21 can perform a power test on the first type of energy storage product, or the controller is also used to control the first circuit breaker 211 and the second DC switch 215 to close so that the first test circuit 21 can store energy into the battery container 216.

[0107] Specifically, the first test circuit 21 is also equipped with a first DC switch 214 and a second DC switch 215, which sequentially connect the first circuit breaker 211, the energy storage converter 212, the first DC switch 214 and the first test unit 213 to test the energy storage product connected to the first test unit 213; one end of the second DC switch 215 is connected in parallel with the first DC switch 214 to the energy storage converter 212, and the other end of the second DC switch 215 is connected to the battery container 216 to use the test platform as an energy storage power station.

[0108] When the first test unit 213 is connected to an energy storage product for testing, the controller controls the first circuit breaker 211 and the first DC switch 214 to close, thereby connecting the first test unit 213 to the first target power supply to test the energy storage product. When the first test unit 213 is idle, the controller can control the first circuit breaker 211 and the second DC switch 215 to close, connecting the battery container 216 to the corresponding energy storage converter 212, and connecting it to the medium-voltage busbar in the factory through the first isolation transformer 11. Peak-valley arbitrage can be performed using the existing equipment on the test platform. Furthermore, when the medium-voltage power fails in the factory area, the test platform can also use the electrical energy stored in the battery container 216 to complete full-power charge and discharge tests of multiple containerized energy storage products and non-containerized energy storage products.

[0109] In one specific embodiment, an electrical interlock is provided between the first DC switch 214 and the second DC switch 215;

[0110] The electrical interlock is used to control the different operating states of the first DC switch 214 and the second DC switch 215.

[0111] Specifically, in order to prevent safety accidents, a 2-to-1 key lock (i.e., electrical interlock) is configured between the first DC switch 214 and the second DC switch 215 to prevent the first bus section 31 and the second bus section 32 from being directly connected.

[0112] In a specific example, such as Figure 6As shown, the test platform includes one 10MVA three-winding transformer T1, one 2500kVA two-winding transformer T2, one 400kVA isolation transformer T3, one 800kVA isolation transformer T4, one AC / DC switching compartment containing two 690Vac busbar sections, one 400Vac busbar section, 13 circuit breakers (QF1~QF13) and 8 DC switches (QS1~QS8), two outdoor DC junction boxes, two outdoor AC junction boxes, one 690Vac outdoor low-voltage junction box, one 400Vac outdoor low-voltage junction box, four 2500kVA PCS modules, and four battery containers that can be used as energy storage power stations. The 690Vac outdoor low-voltage junction box contains two 200kVA PCS modules, whose operating status is controlled by circuit breakers (3QF9, 3QF10) within the junction box.

[0113] The high-voltage side of the three-winding transformer T1 is connected to the factory's 10kV busbar, and the low-voltage side is connected to the two 690Vac busbar incoming circuit breakers QF1 and QF2 in the AC / DC switching compartment, respectively. The high-voltage side of the two-winding transformer T2 is connected to the factory's 10kV busbar, and the low-voltage side is connected to the 400Vac busbar incoming circuit breaker QF3 in the AC / DC switching compartment. The primary side of the isolation transformer T3 is connected to a 690Vac busbar circuit breaker QF4 in the AC / DC switching compartment, and the secondary side is connected to a 690Vac outdoor low-voltage junction box. The primary side of the isolation transformer T4 is connected to a 400Vac busbar circuit breaker QF13 in the AC / DC switching compartment, and the secondary side is connected to a 400Vac outdoor low-voltage junction box.

[0114] In the first 690Vac busbar section within the AC / DC switching compartment, QF1 connects to the three-winding transformer T1, QF4 connects to the isolation transformer T2, and QF5 and QF6 connect to external PCS #1 and PCS #2 respectively. In the two 690Vac busbar sections, QF2 connects to three... Winding transformers T1, QF8, and QF9 are respectively connected to external windings.In section 3# PCS and 4# PCS, within the 400Vac busbar section, QF3 connects to isolation transformer T2, and QF13 connects to isolation transformer T4. Additionally, QF7 and QF11 are connected to outdoor AC junction box #1, and QF10 and QF12 are also connected to outdoor AC junction box #1. QS1, QS3, QS5, and QS7 are connected to four battery containers respectively. QS2 is connected to QS4 and outdoor DC junction box #1, and QS6 is connected to QS8 and outdoor DC junction box #2. Within the two outdoor DC junction boxes, disconnect switches 2QS1, 2QS2, 2QS3, and 2QS4 are connected to AC / DC switching compartments QS2 and QS... 4. QS6, QS8, and four test stations are connected; the circuit breakers 2QF1, 2QF2, 2QF3, and 2QF4 in the two outdoor AC junction boxes are connected to the AC / DC switching compartments QF7, QF10, QF11, and QF12, and the four test stations, respectively; the 690Vac outdoor low-voltage junction box is connected at one end to the secondary side of the isolation transformer T3, and at the other end to the string-type 200kVA module PCS and the AC / DC integrated 690Vac commercial and industrial energy storage cabinet for testing; the 400Vac outdoor low-voltage junction box is connected at one end to the secondary side of the isolation transformer T4, and at the other end to the AC / DC integrated 400Vac commercial and industrial energy storage cabinet. See Table 1 for the component list and specifications of the energy storage product testing platform.

[0115] When energy storage products need to be tested, they are placed in the corresponding container test station or the industrial and commercial energy storage test station according to their product characteristics. Pure DC energy storage containers are connected to outdoor DC junction boxes and undergo full-power charge and discharge tests with the grid through the corresponding 2500kW PCS. AC / DC integrated energy storage containers are connected to outdoor AC junction boxes, and the circuit breaker is switched to connect to the bus section of the corresponding voltage level for full-power charge and discharge tests according to its voltage level. AC / DC integrated industrial and commercial energy storage cabinets are connected to 690Vac or 400Vac junction boxes of the corresponding voltage level for full-power charge and discharge tests. DC industrial and commercial energy storage cabinets are all 1500Vdc systems and are connected to 690Vac junction boxes through string 200kW PCS for full-power charge and discharge tests.

[0116] When there is available space at the DC-side containerized energy storage test station, the load disconnect switch in the AC / DC switching compartment can be switched to connect the corresponding battery container to the corresponding PCS. The corresponding PCS can be connected to the medium-voltage busbar in the factory through the isolation transformer T1. Peak-valley arbitrage can be performed using the existing equipment on the test platform. When the medium-voltage power in the factory area fails, the test platform can still complete the full-power charge and discharge tests of two containerized energy storage products and industrial and commercial energy storage products.

[0117] During the testing process, the product to be tested is placed at its corresponding workstation and wired. Commercial and industrial integrated cabinets are placed at the commercial and industrial testing workstation, while containerized products are placed at the containerized testing workstation. Different products have different testing controls as follows:

[0118] ① For commercial AC / DC integrated cabinet products with 400Vac output, the product is connected to the outdoor 400Vac junction box via a power cable. After closing QF3 and QF13 in the AC / DC switching cabinet and connecting to the power grid, full-power charging and discharging tests can be performed.

[0119] ② For the AC / DC integrated industrial and commercial switchgear product with 690Vac output, the product is connected to the outdoor 690Vac junction box via a power cable. After closing QF4 and QF1 in the AC / DC switching cabinet and connecting to the power grid, full-power charging and discharging tests can be performed.

[0120] ③ For pure DC industrial and commercial switch products with 1500Vdc output, the product is connected to the PCS inside the outdoor 690Vac junction box via a power cable, the corresponding circuit breaker is closed, and QF4 and QF1 in the AC / DC switching cabinet are closed. After connecting to the power grid, full power charging and discharging tests can be performed.

[0121] ④ For AC / DC integrated container products with 400Vac output, connect to the outdoor AC junction box via power cable and close the corresponding circuit breaker (QF11 or QF12, depending on the number of the outdoor AC junction box to which the product is connected); to prevent safety accidents, QF10 and QF11, QF7 and QF12 are equipped with a 2-in-1 key lock and electrical interlock to avoid direct conduction between the 690Vac AC bus and the 400Vac AC bus. After closing QF3, the container is connected to the AC power grid and can be tested for full power charging and discharging.

[0122] ⑤ For 690Vac AC / DC integrated container products, connect to the outdoor AC junction box via power cable and close the corresponding circuit breaker (QF7 or QF10, depending on the number of the outdoor AC junction box to which the product is connected); the measures to prevent direct bus continuity are as described above, and key locks and electrical interlocks are configured; afterward, close QF1 / QF2, and the container is connected to the AC power grid, which can perform full-power charge and discharge tests;

[0123] ⑥ For pure DC energy storage container products with 1500Vdc output, connect to the outdoor DC junction box via power cable and close the corresponding DC switches (QS2, QS4, QS6, QS8); to avoid impact caused by connecting the test container inside the AC / DC switching compartment to the existing energy storage container busbar on site, QS1 and QS2, QS3 and QS4, QS5 and QS6, and QS7 and QS8 are equipped with 2-to-1 key locks and electrical interlocks, ensuring that only one DC switch can be closed under any circumstances; the test product passes... PCS Then, close the corresponding PCS circuit breakers (QF5, QF6, QF8, QF9) in the AC / DC switching compartment. And the switches (QF1, QF2) above, at which point the energy storage container is connected to the AC grid through the PCS, and full-power charge and discharge tests can be performed;

[0124] ⑦ When there are no DC container products to test, QS1, QS3, QS5, and QS7 in the AC / DC switching compartment can be closed to connect the existing energy storage container and PCS on site through DC switches. The PCS circuit breakers (QF5, QF6, QF8, QF9) and the corresponding switches (QF1, QF2) can be closed to use it as an energy storage power station for peak-valley arbitrage.

[0125] ⑧ When the medium-voltage side of the plant loses power, a power grid can be established through PCS 1-4. On the one hand, the medium-voltage busbar of the plant can be restored to power, and on the other hand, the test stations 3 and 4 and the busbars of industrial and commercial energy storage products can be energized, so that full-power drag testing can be carried out.

[0126] Table 1. List of main components and specifications of the power testing platform for energy storage products.

[0127]

[0128]

[0129] This testing platform can perform full-power charge and discharge tests on various types of energy storage products currently on the market and those to be released in the future. It can simultaneously test multiple containerized and non-containerized energy storage products, and it has a small footprint, low investment cost, and can share a large number of devices. It is easy to use, requires minimal preparation for on-site testing, and facilitates factory testing to understand the performance of shipped products. In addition, when there are available DC testing stations, the platform can be used to connect the energy storage converter to the corresponding battery container through DC switch switching operations, turning the platform into an energy storage power station. When the grid loses power, the battery container can be connected to the corresponding energy storage converter to establish an off-grid connection, thereby enabling charge and discharge testing of both containerized and non-containerized energy storage products.

[0130] While specific embodiments of this disclosure have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of this disclosure is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this disclosure, but all such changes and modifications fall within the scope of protection of this disclosure.

Claims

1. A test platform for power testing of energy storage products, characterized in that, The test platform includes a controller, at least one isolation transformer, and N types of test circuits; N ≥ 2 and is an integer. Each of the test circuits includes a switching unit and a test unit connected in sequence; Each of the test circuits is connected to the corresponding isolation transformer via the switching unit; The isolation transformer is connected to the corresponding target power supply; The controller is used to control the closing of the switching unit so that the test circuit can be connected to the corresponding matching target power supply to test the energy storage product connected to the test unit. Each of the test circuits corresponds to testing one type of energy storage product.

2. The testing platform according to claim 1, characterized in that, The test platform includes a first isolation transformer and a second isolation transformer, both of which are connected to a power supply. The N types of test circuits include a first test circuit and a second test circuit; The switching unit of the first test circuit includes a first circuit breaker, the test unit of the first test circuit includes a first test unit, and the first test circuit further includes an energy storage converter. The first circuit breaker, the energy storage converter, and the first test unit are connected in sequence. The switching unit of the second test circuit includes a second circuit breaker and a third circuit breaker, and the test unit of the second test circuit includes a second test unit; The first test circuit is connected to the first isolation transformer via the first circuit breaker; The second test circuit is connected to the first isolation transformer via the second circuit breaker, and the second test circuit is connected to the second isolation transformer via the third circuit breaker; The controller is also used to control the first circuit breaker to close, so that the first test circuit can be connected to the first target power source to perform power testing on the first type of energy storage product connected to the first test unit. The controller is also used to control the second circuit breaker to close, so that the second test circuit can be connected to the first target power source to perform power testing on the second type of energy storage product connected to the second test unit; or, the controller is used to control the third circuit breaker to close, so that the second test circuit can be connected to the second target power source to perform power testing on the third type of energy storage product connected to the second test unit.

3. The testing platform according to claim 2, characterized in that, The N types of test circuits also include a third test circuit; The switching unit of the third test circuit includes a fourth circuit breaker, the test unit of the third test circuit includes a third test unit, and the third test circuit also includes a third isolation transformer. The fourth circuit breaker, the third isolation transformer, and the third test unit are connected in sequence. The third test circuit is connected to the first isolation transformer via the fourth circuit breaker; The controller is also used to control the fourth circuit breaker to close, so that the third test circuit can be connected to the first target power source to perform power testing on the fourth type of energy storage product connected to the third test unit. And / or, The N types of test circuits also include a fourth test circuit; The switching unit of the fourth test circuit includes a fifth circuit breaker, the test unit of the fourth test circuit includes a fourth test unit, and the fourth test circuit also includes a fourth isolation transformer. The fifth circuit breaker, the fourth isolation transformer, and the fourth test unit are connected in sequence. The fourth test circuit is connected to the second isolation transformer via the fifth circuit breaker; The controller is also used to control the closing of the fifth circuit breaker so that the fourth test circuit can be connected to the second target power source to perform power testing on the fifth type of energy storage product connected to the fourth test unit.

4. The testing platform according to claim 3, characterized in that, The test platform also includes a first busbar section, a second busbar section, a sixth circuit breaker, and a seventh circuit breaker; The first isolation transformer, the sixth circuit breaker, and the first busbar section are connected in sequence to connect to the first target power source. The second isolation transformer, the seventh circuit breaker, and the second bus section are connected in sequence to connect to the second target power source; The first test circuit is connected to the first bus section via the first circuit breaker; The second test circuit is connected to the first bus section via the second circuit breaker and to the second bus section via the third circuit breaker; The third test circuit is connected to the first bus section via the fourth circuit breaker. The fourth test circuit is connected to the second bus section via the fifth circuit breaker; The controller is also configured to control the closing of the sixth circuit breaker to connect the first bus section to the first target power supply, and / or the controller is also configured to control the closing of the seventh circuit breaker to connect the second bus section to the second target power supply.

5. The testing platform according to claim 4, characterized in that, The number of the first busbar segment, the first test circuit, and the second test circuit is greater than or equal to 1.

6. The testing platform according to claim 2, characterized in that, The first test circuit also includes a first DC switch and a second DC switch; The first circuit breaker, the energy storage converter, the first DC switch, and the first test unit are connected in sequence. One end of the second DC switch is connected in parallel with the first DC switch to the energy storage converter, and the other end of the second DC switch is connected to the battery container. The controller is also used to control the first circuit breaker and the first DC switch to close, so that the first test circuit can perform a power test on the first type of energy storage product; or, the controller is also used to control the first circuit breaker and the second DC switch to close, so that the first test circuit can store energy into the battery container.

7. The testing platform according to claim 6, characterized in that, An electrical interlock is provided between the first DC switch and the second DC switch; The electrical interlock is used to control the different operating states of the first DC switch and the second DC switch.

8. The test platform according to any one of claims 2 to 7, characterized in that, The first isolation transformer includes a three-winding transformer, the second isolation transformer includes a two-winding transformer; and / or, the voltages of the first target power supply and the second target power supply are different.

9. The test platform according to any one of claims 1 to 7, characterized in that, The testing platform is used to perform full-power tests on energy storage products.

10. The test platform according to any one of claims 3 to 5, characterized in that, The first test unit includes a DC wiring cabinet, which is used to connect to a pure DC energy storage container with a first voltage output; And / or, The second test unit includes an AC wiring cabinet, which is used to connect to an AC / DC integrated container with a second voltage output or an AC / DC integrated container with a third voltage output. And / or, The third test unit includes a first wiring cabinet, which is used to connect a pure DC non-container with a first voltage output and / or an AC / DC integrated non-container with a second voltage output. And / or, The fourth test unit includes a second wiring cabinet, which is used to connect to an AC / DC integrated non-container with a third voltage output.

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