Energy storage system test device

Abstract

The utility model discloses a kind of energy storage system testing device, for testing the anti-reflux and / or demand control function of energy storage system, the energy storage system to be measured includes first energy management system, and energy storage system testing device includes: transformer, the transformer is connected with grid busbar, energy storage system to be measured respectively;Load energy storage cabinet, the load energy storage cabinet is connected with the transformer, energy storage system to be measured respectively;Anti-reflux ammeter, the anti-reflux ammeter is connected in the output end of the load energy storage cabinet, and with first energy management system communication connection.The device uses load energy storage cabinet to simulate load, can adjust output power by itself, without waiting for the condition of specific scene of user field, can be carried out verification in company internal test area, shortens the days period of traditional field debugging to several hours, greatly improves project delivery efficiency.

Description

Technical Field

[0001] This utility model relates to the field of energy storage system testing technology, specifically an energy storage system testing device. Background Technology

[0002] With the large-scale application of industrial and commercial energy storage projects, energy storage systems need to have two key functions: backflow prevention and demand control.

[0003] The anti-reverse flow function is used to prevent electrical energy from flowing back into the grid during discharge, and is a basic requirement for grid connection compliance. Backflow of electrical energy into the grid can not only interfere with the normal operation of the grid, but may also violate grid operation regulations, leading to risks such as fines for industrial and commercial energy storage users.

[0004] Demand control is a core application in energy storage management and smart grids. It prevents excessive power during charging from exceeding the total demand of the plant's transformer, which could cause transformer failure and disrupt the normal operation of equipment within the plant. Currently, the following methods are used to verify these two functions in industrial and commercial energy storage systems:

[0005] On-site debugging involves testing within a real factory area. On-site functional verification suffers from problems such as long verification cycles, low efficiency, high risks, and high costs. For example, testing and verification can only be conducted under specific scenario conditions (peak load time), making the debugging process cumbersome and time-consuming. Errors in program control strategies may result in backflow penalties, causing economic losses, and the testing process may also disrupt normal factory production.

[0006] Laboratory testing utilizes specialized testing equipment such as programmable power grid simulators, programmable load simulators, and programmable generator simulators. These devices are expensive to purchase, complex to operate, and require maintenance by professional technicians. Utility Model Content

[0007] To overcome the shortcomings of existing technologies, this utility model provides an energy storage system testing device. This device uses a load storage cabinet to simulate a load and can automatically adjust its output power. It can be used for verification in the company's internal testing area without waiting for specific conditions at the user's site, thus reducing the traditional on-site commissioning cycle to a few hours and significantly improving project delivery efficiency.

[0008] To achieve the above objectives, the technical solution adopted by this utility model is: an energy storage system testing device for testing the anti-reverse flow and / or demand control functions of an energy storage system. The energy storage system under test includes a first energy management system, and the energy storage system testing device includes:

[0009] The transformer is connected to the power grid bus and the energy storage system under test.

[0010] A load energy storage cabinet, which is connected to the transformer and the energy storage system under test respectively;

[0011] An anti-backflow meter is connected to the output terminal of the load energy storage cabinet and is communicatively connected to the first energy management system.

[0012] The above technical solution uses a load storage cabinet to simulate the load, which can adjust the output power on its own. Without waiting for the user's specific scenario, the verification can be carried out in the company's internal test area, shortening the traditional on-site commissioning cycle to a few hours and greatly improving project delivery efficiency.

[0013] Furthermore, the load energy storage cabinet is equipped with a second energy management system and a second energy storage converter, the second energy management system being connected to the second energy storage converter. The second energy management system can adjust the real-time load power of the load energy storage cabinet.

[0014] Furthermore, it includes a meter connected to the output terminal of the energy storage system under test. The meter is used to monitor the real-time output power of the energy storage system under test.

[0015] Furthermore, the energy storage system under test includes a main energy storage cabinet and at least one slave energy storage cabinet, and a first energy storage converter is respectively installed in the main energy storage cabinet and the slave energy storage cabinet;

[0016] The first energy management system is located inside the main energy storage cabinet and is connected to the first energy storage converter inside the main energy storage cabinet and the first energy storage converter inside the slave energy storage cabinet.

[0017] Furthermore, it also includes a demand meter, which is connected to the output terminal of the load energy storage cabinet. The demand meter is used to monitor the real-time load of the load energy storage cabinet.

[0018] Furthermore, the first energy management system is connected to the first energy storage converters in the main energy storage cabinet and the slave energy storage cabinet respectively via a CANO bus. By connecting the first energy storage converters in the main energy storage cabinet and the slave energy storage cabinet to the first energy management system via the CANO bus, the first energy management system can control the output power of the energy storage system in real time.

[0019] Furthermore, the first energy management system is connected to the anti-backflow meter and the demand meter via an RS485 bus. By connecting the anti-backflow meter and the demand meter to the first energy management system via the RS485 bus, the first energy management system can acquire the data monitored by the anti-backflow meter and the demand meter in real time.

[0020] Based on the above technical solution, the beneficial effects of this utility model are as follows:

[0021] 1. The energy storage system testing device disclosed in this application uses a load energy storage cabinet to simulate the load. It can adjust the output power on its own and can be verified in the company's internal testing area without waiting for the specific conditions of the user's site. This reduces the number of days of traditional on-site commissioning to a few hours and greatly improves project delivery efficiency.

[0022] To make the above and other objects, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the overall structure of the energy storage system testing device in this embodiment of the present invention.

[0025] The reference numerals in the above figures are as follows: 1. Energy storage system under test; 11. First energy management system; 12. Main energy storage cabinet; 13. Slave energy storage cabinet; 14. First energy storage converter; 2. Transformer; 3. Load energy storage cabinet; 31. Second energy management system; 32. Second energy storage converter; 4. Anti-backflow meter; 5. Meter. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] It should be noted that in the description of this utility model, the terms "first," "second," etc., are used only for descriptive purposes and to distinguish similar objects; there is no order between them, nor should they be construed as indicating or implying relative importance. Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0028] Example: This example discloses an energy storage system testing device for testing the reverse flow prevention and / or demand control functions of an energy storage system. The energy storage system under test 1 includes a first energy management system 11. The energy storage system testing device includes:

[0029] Transformer 2, which is connected to the power grid bus and the energy storage system under test 1 respectively;

[0030] Load energy storage cabinet 3 is connected to the transformer 1 and the energy storage system under test 1 respectively;

[0031] Anti-backflow meter 4 is connected to the output end of the load energy storage cabinet 3 and is communicatively connected to the first energy management system 11.

[0032] The above technical solution utilizes a load energy storage cabinet 3 to simulate a load, which can automatically adjust its output power. Verification can be conducted within the company's internal testing area without waiting for specific on-site conditions (peak load time), reducing the traditional on-site commissioning cycle to just a few hours and significantly improving project delivery efficiency. Furthermore, the load energy storage cabinet 3, acting as a load, can store energy, thus avoiding resource waste.

[0033] Among them, such as Figure 1 As shown, the high-voltage side of the transformer 2 is connected to the power grid bus, thereby stepping down the 10KV mains power to 400VAC.

[0034] The AC output terminal of the energy storage system under test 1 is connected to the low-voltage side of the transformer 2. In some feasible embodiments, the energy storage system under test 1 includes a main energy storage cabinet 12 and at least one slave energy storage cabinet 13, with the first energy management system 11 disposed within the main energy storage cabinet 12. The main energy storage cabinet 12 and the slave energy storage cabinet 13 are respectively equipped with a first energy storage converter 14 and a battery pack connected to the first energy storage converter 14. Each of the first energy storage converters 14 is connected to the first energy management system 11 via a CANO bus. This allows the first energy management system 11 to control the charging and discharging power of each battery pack through each of the first energy storage converters 14.

[0035] The AC output terminal of the energy storage system under test 1 is equipped with a meter 5, which is connected to the first energy management system 11 via an RS485 bus. The meter 5 is used to monitor the real-time output power of the energy storage system under test 1 and transmit the data to the first energy management system 11.

[0036] In some feasible embodiments, the meter 5 is connected to the AC output terminal of the energy storage system 1 under test via a Hall sensor.

[0037] The load energy storage cabinet 3 is connected to the low-voltage side of the transformer 2. The load energy storage cabinet 3 is equipped with a second energy management system 31 and a second energy storage converter 32, as well as a battery pack connected to the second energy storage converter 32. The second energy management system 31 is connected to the second energy storage converter 32. The second energy management system 31 can adjust the power of the battery pack through the second energy storage converter 32, thereby adjusting the real-time load power of the load energy storage cabinet 3.

[0038] The anti-reverse current meter 4 is connected to the AC output terminal of the load energy storage cabinet 3, and is connected to the first energy management system 11 via an RS485 bus. The anti-reverse current meter 4 is used to monitor the current direction of the load energy storage cabinet 3 and transmit the data to the first energy management system 11.

[0039] It also includes a demand meter, which is connected to the AC output terminal of the load energy storage cabinet 3 and connected to the first energy management system 11 via an RS485 bus. The demand meter is used to monitor the real-time load of the load energy storage cabinet 3 and transmit the load data to the first energy management system 11.

[0040] In some feasible embodiments, the anti-backflow meter 4 and the demand meter are respectively connected to the AC output terminal of the load energy storage cabinet 3 through Hall sensors.

[0041] In some feasible embodiments, the anti-backflow meter 4 and the demand meter share the same meter, such as the SFE PD194Z-ETKN-CJK or the Acrel ADL400.

[0042] The verification logic using the above-mentioned energy storage system test device is as follows:

[0043] Anti-backflow function:

[0044] Parameter settings: Set the anti-backflow threshold to 10kW and the power hysteresis to 10kW via the first energy management system 11; enable the anti-backflow function. Set the discharge power of the energy storage system 1 under test to 100kW on the first energy management system 11.

[0045] Verification of functional strategy testing: The simulated load power is adjusted through the second energy management system 31 to simulate a reverse flow scenario.

[0046] When the power displayed by the anti-reverse current meter 4 remains positive, the energy storage system 1 under test can discharge normally; when it is negative, the energy storage system 1 under test cannot discharge.

[0047] When the load power is less than 20kW (critical value + hysteresis value), the energy storage system under test 1 cannot discharge; when the load power is greater than 20kW (critical value + hysteresis value), the energy storage system under test 1 can discharge.

[0048] Demand control function:

[0049] Parameter settings: Set the demand limit to 50kW and the power hysteresis to 5kW via the first energy management system 11; enable the demand function. Set the charging power of the energy storage system under test to 100kW on the first energy management system 11.

[0050] Verification of functional strategy testing: The simulated load power is adjusted via the second energy management system 31 to simulate a high-load scenario.

[0051] When the load power is greater than 50kW, the energy storage system under test 1 cannot be charged;

[0052] When the load power is less than 45kW (limit value - hysteresis value), the energy storage system under test can be charged.

[0053] If any requirement is not met during the test, the anti-reverse flow function or demand control function of the energy storage system under test (System 1) is deemed unqualified. The program control strategy must be optimized and the system re-verified.

[0054] This utility model uses specific embodiments to illustrate the principle and implementation of the utility model. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​the utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​the utility model. Therefore, the content of this specification should not be construed as a limitation of the utility model.

Claims

1. An energy storage system testing device for testing the backflow prevention and / or demand control functions of an energy storage system, wherein the energy storage system under test includes a first energy management system, characterized in that, The energy storage system testing equipment includes: The transformer is connected to the power grid bus and the energy storage system under test. A load energy storage cabinet, which is connected to the transformer and the energy storage system under test respectively; An anti-backflow meter is connected to the output terminal of the load energy storage cabinet and is communicatively connected to the first energy management system.

2. The energy storage system testing device as described in claim 1, characterized in that, The load energy storage cabinet is equipped with a second energy management system and a second energy storage converter, and the second energy management system is connected to the second energy storage converter.

3. The energy storage system testing device as described in claim 1, characterized in that, It includes a meter, which is connected to the output terminal of the energy storage system under test.

4. The energy storage system testing device as described in claim 1, characterized in that, The energy storage system under test includes a main energy storage cabinet and at least one slave energy storage cabinet, and a first energy storage converter is respectively installed in the main energy storage cabinet and the slave energy storage cabinet; The first energy management system is located inside the main energy storage cabinet and is connected to the first energy storage converter inside the main energy storage cabinet and the first energy storage converter inside the slave energy storage cabinet.

5. The energy storage system testing device as described in claim 1, characterized in that, It also includes a demand meter, which is connected to the output terminal of the load energy storage cabinet.

6. The energy storage system testing device as described in claim 4, characterized in that, The first energy management system is connected to the first energy storage converter in the main energy storage cabinet and the first energy storage converter in the slave energy storage cabinet via a CANO bus.

7. The energy storage system testing device as described in claim 5, characterized in that, The first energy management system is connected to the anti-backflow meter and the demand meter via an RS485 bus.

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