Energy storage system testing device

Abstract

The utility model provides an energy storage system testing device and an energy storage system, the energy storage system testing device comprises an energy storage testing platform and a cooperative controller, the energy storage testing platform comprises a plurality of energy storage converters PCS and a plurality of energy storage systems BESS; the plurality of PCSs and the plurality of BESSs are in one-to-one correspondence; the multiple PCSs and the multiple BESs are connected in a cooperative control mode so as to control each PCS to output power needed by testing and control the multiple BESs to complete power circulation, and therefore the energy storage system testing device can synchronously test the multiple energy storage systems, the testing cost is reduced, and the testing efficiency is improved. And the limitation that the power required by the test cannot exceed the capacity of the station is relieved through the power circulation of the plurality of BESSs, so that the energy storage system can adopt the charging and discharging power higher than the capacity of the station for testing. In addition, the energy storage system testing device of the utility model can realize testing without accessing a power grid.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage, in particular to an energy storage system testing device. Background Art

[0002] Energy storage system testing usually uses the power grid to transmit electric energy to the energy storage system, and performs charging and discharging tests, performance tests or capacity tests on the energy storage system through the power conversion system (PCS) in the energy storage system (BESS). During this period, the electric energy released by the energy storage system will be transmitted back to the power grid.

[0003] However, as a high-power charging and discharging device, the energy storage system will have a great impact on the transformers and other components that communicate between the power grid and the energy storage system during the test process. Therefore, usually multiple energy storage systems can only be connected to the power grid in sequence for testing, resulting in a long test cycle and high test costs. Utility Model Content

[0004] An object of the present invention is to provide an energy storage system testing device, which is used to reduce the testing cost of the energy storage system and improve its testing efficiency.

[0005] Another object of the present invention is to eliminate the limitation that the power required for testing cannot exceed the capacity of the station by circulating power among multiple energy storage systems.

[0006] Another object of the present invention is to provide an energy storage system testing device that can implement testing without being connected to a power grid.

[0007] To achieve the above objectives, in a first aspect, the utility model provides an energy storage system testing device, comprising:

[0008] Energy storage test platform, the energy storage test platform includes multiple energy storage converters PCS and multiple energy storage systems BESS; multiple PCS correspond to multiple BESS one by one;

[0009] The collaborative controller is connected with a plurality of PCSs to control each PCS to output the power required for the test, and the collaborative controller is connected with a plurality of BESSs to control the plurality of BESSs to complete the power cycle.

[0010] Optionally, the multiple PCSs are not connected to their corresponding BESSs.

[0011] Optionally, multiple PCSs are connected to their corresponding BESSs using communication buses respectively.

[0012] Optionally, the low voltage side of each PCS is connected to its corresponding BESS.

[0013] Optionally, the energy storage system testing device further includes:

[0014] A transformer connected to the high voltage side of multiple PCSs;

[0015] The grid is connected to the transformer.

[0016] Optionally, the energy storage system testing device further includes:

[0017] A first switch is arranged between the power grid and the transformer, wherein the first switch is connected to the cooperative controller;

[0018] The second switch is arranged between the transformer and the plurality of PCSs, wherein the second switch is connected to the cooperative controller.

[0019] Optionally, when the sum of the power required for the test is 0, the collaborative controller controls the first switch to be disconnected and the second switch to be disconnected.

[0020] Optionally, when the sum of the power required for the test is not 0, the cooperative controller controls the first switch to be connected to the grid and the transformer, and the second switch to be connected to the transformer and the plurality of PCSs.

[0021] Optionally, when the sum of powers required for the test of the power grid is not 0, power output is achieved according to the sum of powers.

[0022] Optionally, the power grid stops working when the sum of the power required for the test is greater than the capacity of the station.

[0023] In a second aspect, the present application provides an energy storage system, which includes an energy storage system testing device as described in any one of the first aspects above.

[0024] The technical effects of the utility model are as follows:

[0025] The energy storage system test device and energy storage system provided by the utility model can be used to coordinate the controller to control the power required for each PCS output test and control multiple BESSs to complete power cycles. In this way, the energy storage system test device can test multiple energy storage systems synchronously, thereby reducing test costs and improving test efficiency.

[0026] Furthermore, the energy storage system testing device and energy storage system provided by the utility model control multiple BESSs through a collaborative controller to complete power cycles, thereby removing the limitation that the power required for the test cannot exceed the station capacity, so that the energy storage system can be tested using a charging and discharging power higher than the station capacity.

[0027] Furthermore, the energy storage system testing device and energy storage system provided by the utility model can control multiple BESSs to complete power cycles when the sum of the power required for the test is 0, and can also implement testing without access to the power grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The following drawings are provided to provide a further understanding of the present application, and are included and constitute a part of the present application. The drawings illustrate embodiments of the present application and together with the present specification, explain the principle of the present application. In the drawings:

[0029] Figure 1 is a structural schematic diagram of an energy storage system testing device provided in Example 1;

[0030] Figure 2 is a schematic diagram of an energy storage test platform provided in Example 1;

[0031] Figure 3 is a schematic diagram of an energy storage system testing device provided in Example 1;

[0032] Figure 4 is a structural schematic diagram of an energy storage system testing device provided in Example 2;

[0033] Figure 5 is a structural schematic diagram of an energy storage system testing device provided in Example 3;

[0034] Figure 6 This is an example diagram of a control scenario of a collaborative controller provided in Example 3;

[0035] Figure 7 This is another control scenario example diagram of a collaborative controller provided in Example 3;

[0036] Figure 8 is a structural schematic diagram of an energy storage system testing device provided in Example 4;

[0037] Fig. 9 This is a structural schematic diagram of an energy storage system provided in Example 5. DETAILED DESCRIPTION

[0038] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for the description of the embodiments. Obviously, the drawings described below are only some examples or embodiments of the present application. For ordinary technicians in this field, the present application can also be applied to other similar scenarios based on these drawings without creative work. Unless it is obvious from the language environment or otherwise explained, the same reference numerals in the figures represent the same structure or operation.

[0039] As shown in this application and claims, unless the context clearly indicates an exception, the words "a", "an", "an" and / or "the" do not refer to the singular and may also include the plural. Generally speaking, the terms "include" and "comprise" only indicate the inclusion of the steps and elements that have been clearly identified, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements.

[0040] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so that once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0041] It should be noted that the use of words such as "first" and "second" to define components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above words have no special meaning and cannot be understood as limiting the scope of protection of this application. In addition, although the terms used in this application are selected from well-known and commonly used terms, some terms mentioned in the specification of this application may be selected by the applicant at his or her discretion, and their detailed meanings are explained in the relevant parts of the description of this article. In addition, it is required to understand this application not only by the actual terms used, but also by the meaning implied by each term.

[0042] It should be understood that when a component is referred to as being "on another component," "communicatively connected to another component," "coupled to another component," or "contacting another component," it may be directly on, communicatively connected to, coupled to, or contacting the other component, or there may be intervening components. In contrast, when a component is referred to as being "directly on another component," "directly communicatively connected to," "directly coupled to," or "directly contacting" another component, there are no intervening components. Similarly, when a first component is referred to as being "electrically contacting" or "electrically coupled to" a second component, there is an electrical path between the first component and the second component that allows current to flow. The electrical path may include capacitors, coupled inductors, and / or other components that allow current to flow, even without direct contact between conductive components.

[0043] The embodiment provided by the utility model describes an energy storage system test device and an energy storage system. The energy storage system test device can reduce the test cost of the energy storage system and improve its test efficiency, and remove the limitation that the power required for the test cannot exceed the capacity of the site, and can implement the test without access to the power grid.

[0044] Example 1

[0045] See also Figure 1 As shown, it is a structural schematic diagram of an energy storage system testing device provided in Example 1. The energy storage system testing device includes a collaborative controller 10 and an energy storage testing platform 11. Figure 2 As shown, the energy storage test platform 11 includes multiple energy storage converters PCS110 and multiple energy storage systems BESS111. There is a one-to-one correspondence between multiple PCS110 and multiple BESS111. For example, a BESS111 corresponding to each PCS110 can be placed at a certain position next to its low-voltage side. Figure 2 Each PCS 110 is connected to the cooperative controller 10 so that the cooperative controller 10 controls each PCS 110 to output the power required for the test. Each BESS 111 is connected to the cooperative controller 10 so that the cooperative controller 10 controls multiple BESS 111 to complete the power cycle.

[0046] In some examples, each PCS 110 may be connected to its corresponding BESS 111 using a communication bus, such as any one or a combination of RS485, CAN, Ethernet LAN, Zigbee, and WIFI.

[0047] In some examples, each PCS 110 or BESS 111 may also be connected to the collaborative controller 10 using a communication bus, for example, any one or a combination of RS485, CAN, Ethernet LAN, Zigbee, and WIFI may be used to connect to the collaborative controller 10. The connection between the PCS 110 and the BESS 111 and the collaborative controller 10 helps the collaborative controller 10 receive the working data of the corresponding PCS 110 or BESS 111, such as voltage data, current data, etc. Optionally, when the collaborative controller 10 receives the working data, it can detect in real time whether the corresponding PCS 110 or BESS 111 is working normally.

[0048] Thus, in some examples, when the collaborative controller 10 detects that the corresponding PCS 110 or BESS 111 is working normally, it controls the PCS 110 to output the power required for the test or controls the BESS 111 to complete the power cycle. In other examples, when the collaborative controller 10 detects that the corresponding PCS 110 or BESS 111 is working abnormally, it triggers an alarm for the PCS 110 or BESS 111, so that the staff can find the fault in time.

[0049] The general principle of the energy storage system testing device in this embodiment 1 is as follows Figure 3 As shown. Assume that in the energy storage test platform 11, the power required for a BESS111 test is P1 (approximately 1500kW, discharge power), and the power required for another BESS111 test is P2 (approximately 1500kW, charging power). Then, Figure 3 , the collaborative controller 10 controls one PCS110 to output P1 and the other PCS100 to output P2. Subsequently, the collaborative controller 10 controls the corresponding BESS111 and the other BESS111 to complete the power cycle. Since the two PCS110 respectively output the same charging power and discharging power in this case, the corresponding BESS111 can complete the charging test with the power required for its test in the power cycle, and the corresponding other BESS111 can complete the discharging test with the power required for its test.

[0050] It can be seen that the power cycle between BESS111 enables the tests of two BESS111 to be carried out synchronously, so this device can reduce the test cost and improve the test efficiency. In addition, the overall power inside depends on the sum of the power required for the two BESS111 tests, thereby removing the restriction that the power required for a single BESS test cannot exceed the site capacity. In addition, the two BESS111 themselves can complete the test through power cycling, that is, the test can be achieved without access to the power grid.

[0051] Example 2

[0052] like Figure 4 As shown, it is a structural schematic diagram of an energy storage system testing device provided in Example 2. The difference between Example 2 of the present application and Example 1 is that, in the energy storage testing platform 11 of this Example 2, multiple PCS110 and their corresponding BESS111 are not connected by a communication bus. Since each PCS110 and its corresponding BESS111 can still form a power-on circuit through the connection with the collaborative controller 10, multiple BESS111 can still achieve power circulation under the control of the collaborative controller 10, which can reduce the construction cost of the energy storage testing platform 11.

[0053] Other technical effects of the present embodiment 2 can be specifically seen in the above-mentioned embodiment 1, which will not be repeated here.

[0054] Example 3

[0055] like Figure 5 As shown, it is a schematic diagram of the structure of an energy storage system test device provided in Example 3. The energy storage system test device also includes a power grid 12 and a transformer 13. The transformer 13 is connected to the high voltage side of multiple PCS 110, and the power grid 12 is connected to the transformer 13. Figure 5 A first switch S1 is provided between the power grid 12 and the transformer 13 , a second switch S2 is provided between the transformer 13 and the plurality of PCSs 110 , and both the first switch S1 and the second switch S2 are connected to the collaborative controller 10 .

[0056] When the sum of the power required for the test is 0, the cooperative controller 10 controls the first switch S1 to be disconnected, and controls the second switch S2 to be disconnected. Figure 6 As described above, in one example, the power required for one BESS111 test is P3 (approximately 1500 kW, discharge power), and the power required for another BESS111 test is P4 (approximately 1500 kW, charging power). Figure 6 , the cooperative controller 10 controls the first switch S1 and the second switch S2 to be disconnected, and then controls one PCS110 to output P3 and the other PCS100 to output P4. Then, the cooperative controller 10 controls the corresponding BESS111 and the other BESS111 to complete the power cycle. Since the two PCS110 respectively output the same charging power and discharging power in this case, the corresponding BESS111 can complete the charging test with the power required for its test in the power cycle, and the corresponding other BESS111 can complete the discharging test with the power required for its test.

[0057] When the sum of the power required for the test is not 0, the cooperative controller 10 controls the first switch S1 to be connected to the power grid 12 and the transformer 13, and controls the second switch S2 to be connected to the transformer 13 and the plurality of PCSs 110. Figure 7As shown, in one example, the power required for a BESS 111 test is P5 (approximately 2500kW, charging), and the power required for another BESS 111 test is P6 (approximately 1500kW, discharging). Then, the collaborative controller 10 controls the first switch S1 to be closed and connected to the power grid 12 and the transformer 13, and the second switch S2 to be closed and connected to the transformer 13 and multiple PCS 110. Subsequently, the power grid outputs power according to the sum of the powers of P5 and P6, that is, outputs the power Ps (approximately 1000kW, charging) required for the remaining test. Subsequently, the collaborative controller 10 controls the power cycle between the two BESS 111 so that the two BESS 111 can each complete the charging and discharging test with the power required for its test.

[0058] In one example, the power grid 12 stops working when the sum of the power required for the test is greater than the site capacity to ensure the safety of the test.

[0059] Other technical effects of the present embodiment 3 can be specifically seen in the above-mentioned embodiment 1, which will not be repeated here.

[0060] Example 4

[0061] like Figure 8 As shown, it is a structural schematic diagram of an energy storage system testing device provided in Example 4. The difference between Example 4 of the present application and Example 3 is that in the energy storage testing platform 11 of this Example 4, multiple PCS110 are not connected to their corresponding BESS111. Since each PCS110 and its corresponding BESS111 can still form a power-on circuit through the connection with the collaborative controller 10, multiple BESS111 can still achieve power circulation under the control of the collaborative controller 10, which can reduce the construction cost of the energy storage testing platform 11.

[0062] Other technical effects of this embodiment 4 can be specifically seen in the above-mentioned embodiment 1, and will not be repeated here.

[0063] The energy storage system test device described in the above embodiment, the collaborative controller can be used to control the power required for each PCS output test and control multiple BESSs to complete power cycles. In this way, the energy storage system test device can test multiple energy storage systems synchronously, thereby reducing test costs and improving test efficiency.

[0064] Furthermore, the energy storage system testing device provided by the utility model controls multiple BESSs to complete power cycles through a collaborative controller, thereby removing the restriction that the power required for the test cannot exceed the station capacity, so that the energy storage system can be tested using a charging and discharging power higher than the station capacity.

[0065] Furthermore, the energy storage system testing device provided by the present invention can control multiple BESSs to complete power cycles when the sum of the power required for the test is 0, and can also implement testing without access to the power grid.

[0066] Example 5

[0067] like Fig. 9 As shown, an exemplary embodiment of the present application also provides an energy storage system, which may include an energy storage system testing device, for example, may include an energy storage system testing device 1, and the energy storage system testing device 1 may be an energy storage system testing device as described in any one of the above embodiments 1 to 4.

[0068] The technical effects that can be achieved by this embodiment 5 can be specifically seen in the above embodiments 1 to 4, and will not be repeated here.

[0069] The basic concepts have been described above. Obviously, for those skilled in the art, the above disclosure is only an example and does not constitute a limitation of the present application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements and amendments to the present application. Such modifications, improvements and amendments are suggested in the present application, so such modifications, improvements and amendments still belong to the spirit and scope of the exemplary embodiments of the present application.

[0070] At the same time, the present application uses specific words to describe the embodiments of the present application. For example, "one embodiment", "an embodiment", and / or "some embodiments" refer to a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or more in different positions in this specification does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be appropriately combined.

[0071] Similarly, it should be noted that in order to simplify the description disclosed in this application and thus help understand one or more embodiments, in the above description of the embodiments of this application, multiple features are sometimes combined into one embodiment, figure or description thereof. However, this disclosure method does not mean that the features required by the object of this application are more than the features mentioned in the claims. In fact, the features of the embodiments are less than all the features of the single embodiment disclosed above.

[0072] In some embodiments, numbers describing the number of components and attributes are used. It should be understood that such numbers used in the description of the embodiments are modified by the modifiers "about", "approximately" or "substantially" in some examples. Unless otherwise specified, "about", "approximately" or "substantially" indicate that the numbers are allowed to vary by ±20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximate values, which may change according to the required features of individual embodiments. In some embodiments, the numerical parameters should take into account the specified significant digits and adopt the general method of retaining digits. Although the numerical domains and parameters used to confirm the breadth of their range in some embodiments of the present application are approximate values, in specific embodiments, the setting of such numerical values ​​is as accurate as possible within the feasible range.

[0073] Although the present application has been described with reference to the current specific embodiments, ordinary technicians in this technical field should recognize that the above embodiments are only used to illustrate the present application, and various equivalent changes or substitutions may be made without departing from the spirit of the present application. Therefore, as long as the changes and modifications to the above embodiments are within the essential spirit of the present application, they will fall within the scope of the claims of the present application.

Claims

1. An energy storage system testing device, characterized in that: include: An energy storage test platform, the energy storage test platform comprising a plurality of energy storage converters PCS and a plurality of energy storage systems BESS; the plurality of PCS corresponds to the plurality of BESS in a one-to-one manner; A coordinated controller is connected to the multiple PCSs to control each PCS to output power required for a test, and the coordinated controller is connected to the multiple BESSs to control the multiple BESSs to complete a power cycle.

2. The energy storage system testing device according to claim 1, characterized in that: The multiple PCSs are not connected to their corresponding BESSs.

3. The energy storage system testing device according to claim 1, characterized in that: The multiple PCSs are connected to their corresponding BESSs respectively using a communication bus.

4. The energy storage system testing device according to claim 3, characterized in that: The low voltage side of each PCS is connected to its corresponding BESS.

5. The energy storage system testing device according to any one of claims 1 to 4, characterized in that: Also includes: A transformer connected to the high voltage side of the plurality of PCSs; A power grid is connected to the transformer.

6. The energy storage system testing device according to claim 5, characterized in that: Also includes: A first switch is arranged between the power grid and the transformer, wherein the first switch is connected to the cooperative controller; A second switch is disposed between the transformer and the plurality of PCSs, wherein the second switch is connected to the cooperative controller.

7. The energy storage system testing device according to claim 6, characterized in that: When the sum of the power required for the test is 0, the cooperative controller controls the first switch to be disconnected and the second switch to be disconnected.

8. The energy storage system testing device according to claim 6, characterized in that: When the sum of the power required for the test is not zero, the cooperative controller controls the first switch to be connected to the grid and the transformer, and the second switch to be connected to the transformer and the plurality of PCSs.

9. The energy storage system testing device according to claim 6, characterized in that: When the sum of powers required for the test of the power grid is not 0, power output is achieved according to the sum of powers.

10. The energy storage system testing device according to claim 6, characterized in that: The power grid stops working when the sum of the power required for the test is greater than the station capacity.

11. An energy storage system, characterized in that: The energy storage system comprises the energy storage system testing device according to any one of claims 1-10.

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