Method and device for testing capability of energy storage system and energy storage system

Abstract

The embodiment of the invention provides an energy storage system capability test method and device and an energy storage system, and can effectively perform high-rate performance test on an energy storage converter. The method comprises the steps that test parameters are acquired, the test parameters comprise a target current value or a target power value, the target current value is n times of a rated current value of an energy storage converter in the energy storage system, the target power value is m times of a rated power value of the energy storage converter, n is larger than or equal to 3, and / or m is larger than or equal to 3; and based on the test parameters, carrying out capability test on the energy storage converter.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, and in particular to a method, apparatus and energy storage system for testing the capacity of an energy storage system. Background Technology

[0002] With the promotion and application of new energy sources such as solar and wind power, energy storage technology has also developed accordingly. Currently, grid-connected energy storage lacks the ability to actively support the power grid. When connected to the grid on a large scale, it is prone to problems such as loss of inertia and oscillation instability. Moreover, grid-connected energy storage can only operate in grid-connected mode and cannot operate in off-grid mode.

[0003] To adapt to the characteristics of long transmission distances and low grid inertia in some areas rich in renewable energy, and to improve the reliability of off-grid operation, grid-based energy storage has emerged. Grid-based energy storage typically places certain requirements on the capacity of the energy storage converter; therefore, how to conduct capacity testing on the energy storage converter is an urgent problem to be solved. Summary of the Invention

[0004] This application provides a method, apparatus, and energy storage system for testing the capabilities of an energy storage system, which can effectively perform high-rate performance testing on energy storage converters.

[0005] In a first aspect, a method for testing the capability of an energy storage system is provided. The method includes: acquiring test parameters, the test parameters including a target current value or a target power value, the target current value being n times the rated current value of the energy storage converter in the energy storage system, the target power value being m times the rated power value of the energy storage converter, where n is greater than or equal to 3, and / or m is greater than or equal to 3; and performing a capability test on the energy storage converter based on the test parameters.

[0006] In this embodiment of the application, by setting the test parameters to n times the rated current value of the energy storage converter, or setting the test parameters to m times the rated power value of the energy storage converter, where m and / or n are greater than or equal to 3, not only are the national standard requirements met, but the purpose of high-rate performance testing of the energy storage converter can also be achieved.

[0007] In some possible implementations, the capability test includes an overcurrent capability test, wherein the discharge current value of the battery device corresponding to the energy storage converter is in the range of 0.8*n*Id1 to 1.36*n*Id1, where Id1 is the current value of the battery device when the energy storage converter outputs the rated current value.

[0008] This technical solution sets the discharge current value of the battery device corresponding to the energy storage converter between 0.8*n*Id1 and 1.36*n*Id1 during the overcurrent capacity test. In this way, the battery device discharges based on this discharge current value during the overcurrent capacity test, which can effectively reduce the possibility that the DC side battery device cannot meet the overcurrent requirements during the overcurrent capacity test, so that the overcurrent capacity test can be carried out normally.

[0009] In some possible implementations, the capability test includes an overload capability test, wherein the discharge current value of the battery device corresponding to the energy storage converter is in the range of 1*m*Id2 to 1.36*m*Id2, where Id2 is the current value of the battery device when the energy storage converter outputs its rated power value.

[0010] This technical solution sets the discharge current value of the battery device corresponding to the energy storage converter in the range of 1*m*Id2 to 1.36*m*Id2 during overload capacity testing. In this way, the first battery device can discharge based on the first discharge current value, which can effectively reduce the possibility that the DC side battery device cannot meet the overload requirements during the overload capacity test, so that the overload capacity test can be carried out normally.

[0011] In some possible implementations, the method further includes sending a current command to the battery device, the current command indicating the discharge current value of the battery device.

[0012] This technical solution, by indicating the discharge current value to the battery device during the capability test, can further ensure that the discharge current value of the battery device is within the specified range, reducing the possibility that the DC side battery device may fail to meet the test requirements during the capability test, thus enabling the capability test to proceed normally.

[0013] In some possible implementations, the energy storage system includes multiple energy storage converters, the multiple energy storage converters including a first energy storage converter. When the capability test includes an overcurrent capability test, the capability test of the energy storage converter based on the test parameters includes: sending a first instruction to the first energy storage converter among the multiple energy storage converters, and sending a second instruction to at least some of the energy storage converters other than the first energy storage converter, to perform an overcurrent capability test on the first energy storage converter; wherein the first instruction is used to instruct the first energy storage converter to output the target current value, the second instruction is used to instruct the at least some energy storage converters to receive current values, and the sum of the current values ​​received by the at least some energy storage converters is equal to the target current value.

[0014] In this embodiment, overcurrent capability testing is performed among multiple energy storage converters. One energy storage converter outputs a high-rate current, and the other energy storage converters receive the current output by that energy storage converter. In this way, not only is the high-rate performance of the energy storage converters effectively tested, but the testing process does not require energy to be output to the grid, which reduces the possibility of high-rate operation impacting the grid and is conducive to the normal operation of the grid.

[0015] In some possible implementations, the energy storage system includes multiple energy storage converters, the multiple energy storage converters including a first energy storage converter. When the capability test includes an overload capability test, the capability test of the energy storage converter based on the test parameters includes: sending a third instruction to the first energy storage converter and sending a fourth instruction to at least some of the multiple energy storage converters other than the first energy storage converter, to perform an overload capability test on the first energy storage converter; wherein the third instruction is used to instruct the first energy storage converter to output the target power value, the fourth instruction is used to instruct the at least some energy storage converters to receive power values, and the sum of the power values ​​received by the at least some energy storage converters is equal to the target power value.

[0016] In this embodiment, overload capacity testing is performed among multiple energy storage converters. One energy storage converter outputs high-rate power, and the other energy storage converters receive the power output by that energy storage converter. In this way, not only is the high-rate performance of the energy storage converters effectively tested, but the testing process does not require energy to be output to the grid, which reduces the possibility of high-rate operation impacting the grid and is conducive to the normal operation of the grid.

[0017] In some possible implementations, the method further includes sending a stop output command to the first energy storage converter, the stop output command being used to instruct the first energy storage converter to stop outputting current or power while maintaining the target current value or the target power value for a target duration.

[0018] This technical solution ensures that the first energy storage converter stops outputting current or power only after maintaining the target current or power value for a target duration. This allows for more effective testing of the high-rate performance of the first energy storage converter, resulting in more accurate test results. Furthermore, by sending a stop output command to the first energy storage converter to control its current or power output, the timing of the first energy storage converter's output cessation can be adapted to the current operating status of the entire energy storage system, thus facilitating smoother capacity testing.

[0019] In some possible implementations, the target duration is less than or equal to 1 minute. This technical solution, by setting the target duration to less than or equal to 1 minute, can achieve the purpose of high-rate performance testing of the first energy storage converter in a shorter time, reducing time costs and improving testing efficiency.

[0020] In some possible implementations, the plurality of energy storage converters includes a second energy storage converter. When the capability test includes an overcurrent capability test, the capability test of the energy storage converter based on the test parameters includes: when the first energy storage converter stops outputting current, sending a fifth instruction to the second energy storage converter based on the test parameters, and sending a sixth instruction to the energy storage converters other than the second energy storage converter among the plurality of energy storage converters, to perform an overcurrent capability test on the second energy storage converter; wherein the fifth instruction is used to instruct the second energy storage converter to output the target current value, the sixth instruction is used to instruct the energy storage converters other than the second energy storage converter to receive the current value, and the sum of the current values ​​received by the energy storage converters other than the second energy storage converter is equal to the target current value.

[0021] This technical solution, after the overcurrent capacity test of the first energy storage converter is completed, continues to test the overcurrent capacity of the second energy storage converter among multiple energy storage converters, and the testing method is the same as that of the first energy storage converter. That is, the second energy storage converter outputs a high-rate current, and the other energy storage converters receive the current output by the second energy storage converter. In this way, not only is the high-rate performance of the second energy storage converter effectively tested, but also no energy needs to be output to the grid during the test, reducing the possibility of grid impact from high-rate operation and promoting the normal operation of the grid. Furthermore, the overcurrent capacity tests of multiple energy storage converters are performed sequentially, allowing the overcurrent capacity tests of multiple energy storage converters to be carried out in an orderly manner.

[0022] In some possible implementations, the plurality of energy storage converters includes a second energy storage converter. When the capability test includes an overload capability test, the capability test of the energy storage converter based on the test parameters includes: when the first energy storage converter stops outputting power, sending a seventh instruction to the second energy storage converter based on the test parameters, and sending an eighth instruction to the energy storage converters other than the second energy storage converter among the plurality of energy storage converters, to perform an overload capability test on the second energy storage converter; wherein the seventh instruction is used to instruct the second energy storage converter to output the target power value, the eighth instruction is used to instruct the energy storage converters other than the second energy storage converter to receive the power value, and the sum of the power values ​​received by the energy storage converters other than the second energy storage converter is equal to the target power value.

[0023] This technical solution, after the overload capacity test of the first energy storage converter is completed, continues to test the overload capacity of the second energy storage converter among multiple energy storage converters, and the testing method is the same as that of the first energy storage converter. That is, the second energy storage converter outputs high-rate power, and the other energy storage converters receive the power output by the second energy storage converter. In this way, not only is the high-rate performance of the second energy storage converter effectively tested, but also no energy needs to be output to the grid during the test, reducing the possibility of grid impact from high-rate operation and promoting the normal operation of the grid. Furthermore, the overload capacity tests of multiple energy storage converters are conducted sequentially, allowing the overload capacity tests of multiple energy storage converters to be carried out in an orderly manner.

[0024] Secondly, an apparatus for testing the capacity of an energy storage system is provided. The energy storage system includes multiple energy storage converters. The apparatus includes: a processing unit for acquiring test parameters, the test parameters including a target current value or a target power value, the target current value being n times the rated current value of the energy storage converter in the energy storage system, the test parameters including a target power value, the target power value being m times the rated power value of the multiple energy storage converters, where n is greater than or equal to 3, and / or m is greater than or equal to 3; and a testing unit for performing capacity testing on the energy storage converters based on the test parameters.

[0025] Thirdly, an apparatus for testing the capability of an energy storage system is provided, comprising a processor and a memory, wherein the memory is used to store a computer program, and the processor is used to call the computer program to execute the methods in the first aspect or its various implementations described above.

[0026] Fourthly, an energy storage system is provided, comprising: an energy storage converter; and an apparatus for testing the capacity of the energy storage system according to the second or third aspect described above, the apparatus being used to perform a capacity test on the energy storage converter.

[0027] Fifthly, a computer-readable storage medium is provided for storing a computer program that causes a computer to perform the methods described in the first aspect or its various implementations.

[0028] In a sixth aspect, a computer program product is provided, comprising a computer program stored on a computer-readable storage medium, the computer program including program instructions that, when executed by a computer, cause the computer to perform the methods described in the first aspect or its various implementations. Attached Figure Description

[0029] Figure 1 A schematic diagram of an energy storage device according to an embodiment of this application is shown.

[0030] Figure 2 A schematic flowchart illustrating a method for testing the capacity of an energy storage system according to an embodiment of this application is shown.

[0031] Figure 3 A schematic diagram illustrating the flow of energy between different battery systems according to an embodiment of this application is shown.

[0032] Figure 4 A schematic flowchart illustrating the flow of energy between the same battery system according to an embodiment of this application is shown.

[0033] Figure 5 A flowchart illustrating a capability test of an energy storage system according to an embodiment of this application is shown.

[0034] Figure 6 A flowchart of another energy storage system capability test according to an embodiment of this application is shown.

[0035] Figure 7 A schematic block diagram of an apparatus for testing the capability of a first energy storage system according to an embodiment of this application is shown.

[0036] Figure 8 A schematic block diagram of an apparatus for testing the capability of a second energy storage system according to an embodiment of this application is shown.

[0037] Figure 9 A schematic block diagram of an energy storage system according to an embodiment of this application is shown. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0039] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the specification of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings of this application are used to distinguish different objects, rather than to describe a specific order or hierarchy.

[0040] The directional terms used in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of this application. It should also be noted in the description of this application that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0041] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0042] In this application, "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0043] With the widespread application of new energy sources such as solar and wind power, energy storage technology has also developed accordingly. However, the intermittent and fluctuating characteristics of wind and photovoltaic power generation pose certain challenges to the stability of the power grid. As a massive inertial system, the power grid needs to maintain a constant balance between inertia and active power. In the past, during the era dominated by thermal power generation, synchronous generators were crucial for ensuring the stability of the power system. In modern power industry, synchronous generators are widely used in hydropower, thermal power, nuclear power, and diesel generators. Because synchronous generators generally use DC exciters, when operating independently, the generator voltage can be easily adjusted by regulating the excitation current, providing inertia and primary frequency regulation to the grid. According to the rotor motion equation, when there is a shortage of active power in the grid, the generator rotor accelerates, and the grid frequency increases; conversely, the grid frequency decreases. However, with the increasing proportion of new energy power generation, maintaining grid stability has become increasingly difficult.

[0044] There is a fundamental difference between renewable energy generation and synchronous generator generation. Existing renewable energy sources generally lack inertia support capabilities. Renewable energy generation such as wind and solar power requires inverters to be connected to the grid. These power electronic inverters have advantages such as flexible control and rapid response. However, with the increasing number of power electronic devices in the power system, the low inertia, low damping, and weak voltage support characteristics of these devices can affect the stable operation of the power system.

[0045] Grid-based energy storage with voltage source characteristics has attracted widespread attention because it can effectively improve problems such as the lack of rotational inertia in power systems. Grid-based energy storage allows energy storage systems to achieve operating characteristics similar to synchronous generators, actively building the electromotive force necessary for stable system operation in the pre-, during, and post-disturbance stages of power system disturbances. This has the following four important implications for the power grid.

[0046] I. Improve frequency stability. Provides real inertia support, enabling natural and instantaneous power output after frequency disturbances occur in the external power grid, thus reducing the rate of change in grid frequency.

[0047] Second, it can mitigate voltage fluctuations. Especially in the vicinity of UHVDC lines where new energy sources are concentrated, commutation failure can lead to transient overvoltages in the AC system. Grid-based energy storage can mitigate rapid voltage changes through timely response, avoiding the response lag and reverse adjustment problems of conventional grid-based dynamic reactive power compensation devices.

[0048] Third, improve the short-circuit ratio of multiple renewable energy sites. Grid-based energy storage exhibits the external characteristics of an independent voltage source, equivalent to a parallel voltage source on the main grid side. This can indirectly change the short-circuit impedance on the system side, increase the short-circuit current, and thus increase the short-circuit capacity, supporting the access of more renewable energy sources.

[0049] IV. Enhancing the adaptability of the "three lines of defense" under the new power system. With the continuous integration of new energy sources, grid-connected new energy units exhibit current source characteristics, and there are problems such as insufficient short-circuit capacity during faults. Traditional current protection cannot adapt to these issues. By configuring grid-connected energy storage, the proportion of voltage source equipment such as synchronous generators in the system can be effectively increased, and the traditional "three lines of defense" can still be used.

[0050] In grid-based energy storage, it is usually necessary to test the energy storage converter at high rates.

[0051] In view of this, embodiments of this application provide a method for testing the capability of an energy storage system. The method includes: acquiring test parameters and performing a capability test on an energy storage converter in the energy storage system based on the test parameters. The test parameters include a target current value or a target power value, wherein the target current value is n times the rated current value of the energy storage converter, and the target power value is m times the rated power value of the energy storage converter, where n is greater than or equal to 3, and / or m is greater than or equal to 3.

[0052] This method sets the test parameters to n times the rated current value of the energy storage converter, or to m times the rated power value of the energy storage converter, where m and / or n are greater than or equal to 3. In this way, it not only meets the national standard requirements, but also achieves the purpose of high-rate performance testing of the energy storage converter.

[0053] The technical solutions described in this application are applicable to various energy storage systems. An energy storage system is a device or system capable of storing energy and releasing it when needed. In the field of new energy, energy storage systems typically refer to devices capable of storing electrical energy and releasing it during peak electricity demand periods. Energy storage systems play multiple roles in the power system, including load balancing, frequency regulation, backup power, peak-valley pricing management, and improving grid stability. With the rapid development of renewable energy, the importance of energy storage systems is increasing.

[0054] Electrochemical energy storage, represented by lithium-ion batteries, is a widely used energy storage technology. An electrochemical energy storage system consists of battery devices, a battery management system (BMS), an energy management system (EMS), a power converter system (PCS), and auxiliary equipment.

[0055] The battery and BMS are housed within the energy storage device, which may be, for example, […]. Figure 1 The diagram shows an energy storage container. Battery units are the energy storage medium in an energy storage system, responsible for storing and releasing electrical energy. The Battery Management System (BMS) monitors and manages the status of the battery units, including charge / discharge status, voltage, temperature, and current, to ensure the battery units operate within safe operating ranges and prevent over-discharge, overheating, and short circuits, thereby extending battery life. The Energy Management System (EMS) is the control center of the energy storage system, responsible for monitoring the overall system operation and optimizing energy storage and release strategies to meet grid demands or user-defined goals. The Power Control System (PCS) is mainly used to control the conversion and flow of electrical energy in the energy storage system, converting direct current (DC) to alternating current (AC) to meet grid or load demands. Simultaneously, the PCS can also convert AC to DC to charge the battery units in the energy storage system.

[0056] Figure 2 A schematic flowchart of a method 200 for testing the capacity of an energy storage system according to an embodiment of this application is shown. Exemplarily, method 200 can be performed by an EMS. Method 200 may include at least some of the following.

[0057] S210: Obtain test parameters.

[0058] S220: Perform capability testing on the PCS based on test parameters.

[0059] The test parameters include target current value or target power value. The target current value is n times the rated current value of the PCS, and the target power value is m times the rated power value of the PCS.

[0060] In this embodiment of the application, by setting the test parameters to n times the rated current value of the PCS, or setting the test parameters to m times the rated power value of the PCS, the performance of the PCS can be effectively tested.

[0061] Users can input test parameters, which the EMS can then obtain. Alternatively, the EMS can calculate the test parameters itself.

[0062] The target current value is AC current, and the target power value is AC power.

[0063] Capability testing may include overcurrent capability testing or overload capability testing. When the capability testing includes overcurrent capability testing, the test parameters include the target current value; when the capability testing includes overload capability testing, the test parameters include the target power value.

[0064] Among them, overcurrent capacity refers to the ability of a PCS to withstand a large current exceeding the rated value for a short period of time without permanent damage, while overload capacity refers to the ability of a PCS to withstand operation exceeding the rated power or torque for a relatively long period of time.

[0065] In some embodiments, n can be greater than or equal to 3. For example, the value of n can range from 3 to 12, such as 4, 5, 6, 7, 8, 9, 10, or 11. This technical solution, by setting n to be greater than or equal to 3, not only meets national standard requirements but also achieves the purpose of high-rate performance testing of PCS.

[0066] Of course, n can also be less than 3, such as n being 1.5 or 2, etc.

[0067] Similarly, m can be greater than or equal to 3. For example, the value of m can be between 3 and 12, such as n being 4, 5, 6, 7, 8, 9, 10, or 11. This technical solution, by setting m to be greater than or equal to 3, not only meets the national standard requirements but also achieves the purpose of high-rate performance testing of PCS.

[0068] Of course, m can also be less than 3, such as n being 1.5 or 2, etc.

[0069] n and m can be the same, for example, n and m are both 3. Or, n and m can be different, for example, n is 3 and m is 4.

[0070] PCS typically corresponds to a battery device. To reduce the possibility that the battery device may fail to meet the test requirements during capability testing, the discharge current value of the battery device corresponding to the PCS can be set.

[0071] As an example, the discharge current value can be preset on the battery device.

[0072] As another example, method 200 may also include: sending a current command to the battery device, the current command being used to indicate the discharge current value of the battery device.

[0073] This technical solution ensures that the discharge current value of the battery device is within the specified range by indicating the discharge current value to the battery device during the capability test. This reduces the possibility that the DC side battery device may fail to meet the test requirements during the capability test, allowing the capability test to proceed normally.

[0074] It should be noted that, in the embodiments of this application, the PCS can also send current commands to the battery device.

[0075] Optionally, if the capability test includes an overcurrent capability test, the discharge current value can be related to n.

[0076] In some embodiments, the discharge current value may be greater than or equal to 0.5*n*Id1, where Id1 is the current value of the battery device when the PCS outputs the rated current value.

[0077] For example, the discharge current value can be between 0.8*n*Id1 and 1.36*n*Id1. This technical solution sets the discharge current value of the battery device between 0.8*n*Id1 and 1.36*n*Id1 during overcurrent capacity testing. This allows the battery device to discharge based on this current value, effectively reducing the possibility of the DC-side battery device failing to meet overcurrent requirements during the overcurrent capacity test, thus ensuring the load capacity test can proceed normally.

[0078] Of course, the discharge current value can also be greater than 1.36*n*Id1, such as 1.5*n*Id1, 2*n*Id1, 2.5*n*Id1, 3*n*Id1, etc.

[0079] Optionally, if the capability test includes an overload capability test, the discharge current value can be related to m.

[0080] In some embodiments, the discharge current value may be greater than or equal to 0.5*m*Id2, where Id2 is the current value of the battery device when the PCS outputs the rated power value.

[0081] For example, the discharge current value can be between 1*m*Id² and 1.36*m*Id². This technical solution sets the discharge current value of the battery device within the range of 1*m*Id² to 1.36*m*Id² during overload capacity testing. This allows the battery device to discharge based on this current value during the overload capacity test, effectively reducing the possibility of the DC-side battery device failing to meet overload requirements and ensuring the overcurrent capacity test can proceed normally.

[0082] Of course, the discharge current value can also be greater than 1.36*m*Id2. For example, the discharge current value can be 1.5*m*Id2, 2*m*Id2, 2.5*m*Id2, 3*m*Id2, 3.5*m*Id2, etc.

[0083] The derivation process of the discharge current value of the battery device will be described below.

[0084] Assuming the rated discharge power of the battery device is Pd, the rated discharge voltage of the battery device is Ud, the rated discharge current of the battery device is Id, the efficiency of the PCS is η, the rated AC power of the PCS is Pa, the rated AC voltage is Ua, and the rated AC current is Ia, then the following formula can be obtained: Pd=Ud*Id(1) Pa = Ua * Ia (2) Pa = η * Pd (3) Ua*Ia=η*Ud*Id(4) Ia=η*Ud*Id / Ua(5) When conducting overcurrent capacity testing, assuming the target current output of the PCS is I1, the AC voltage output of the PCS is Ua1, the discharge voltage of the battery device is Ud1, the discharge current of the battery device is Id1, and Ua1 is between 80% of Ua and Ua, the following formula can be obtained: I1*Ua1=η*Ud1*Id1=n*Ia*Ua1=(n*η*Ud*Id / Ua)*Ua1 (6) η*Ud1*Id1=(n*η*Ud*Id / Ua)*Ua1 (7) Ud1*Id1=(n*Ud*Id*Ua1) / Ua(8) n*Ud / Ud1=Id1 / (Id*Ua1 / Ua) (9) n*Ud / Ud1=Id1 / Id*(Ua / Ua1) (10) Id1 / Id=(n*Ud / Ud1) / (Ua / Ua1) (11) From formula (11), we can see that the maximum value of Id1 / Id can be obtained when Ua1=Ua. Assuming that the battery device is a lithium iron phosphate battery, the maximum dynamic voltage of a single cell during discharge can be 3.4V and the minimum voltage can be 2.5V. At this time, Id1 / Id=n*3.4 / 2.5=n*1.36, so the maximum value of Id1 is n*1.36*Id.

[0085] The minimum value of Id1 / Id can be obtained when Ud = Ud1 and Ua1 = 80%Ua. At this time, Id1 / Id = n / (Ua / 0.8Ua) = n*0.8, so the minimum value of Id1 is n*0.8*Id.

[0086] Assuming n=3, the maximum value of Id1 / Id is 3*3.4 / 2.5=4.08, and the minimum value of Id1 / Id is 3*0.8=2.4. Therefore, when the PCS outputs 3 times the rated current value, the increase in the discharge current value of the battery device is between 2.4 times and 4.08 times.

[0087] When conducting overload capacity testing, assuming the target power output of the PCS is P2, U2 is the output voltage of the PCS, I2 is the output current of the PCS, the discharge voltage of the battery device is Ud2, and the discharge current of the battery device is Id2, then the following formula can be obtained: P2=mPa(12) U2*I2=η*Ud2*Id2=m*Ua*Ia=m*η*Ud*Id (13) Ud2 / Ud=m*Id / Id2(14) m*Ud / Ud2=Id2 / Id(15) Assuming the battery device is a lithium iron phosphate battery, the maximum dynamic voltage of a single cell during discharge can be 3.4V, and the minimum voltage can be 2.5V. From formula (15), we know that the maximum value of Id2 / Id is m*3.4 / 2.5=m*1.36, so the maximum value of Id2 is m*1.36*Id.

[0088] When Ud = Ud2, the minimum value of Id2 / Id can be obtained. At this time, Id2 / Id = m, so the minimum value of Id2 is m*Id.

[0089] Assuming m=3, the maximum value of Id2 / Id is 3*3.4 / 2.5=4.08, and the minimum value of Id2 / Id is 3. Therefore, when the PCS outputs 3 times the rated power value, the increase in the discharge current value of the battery device is between 3 times and 4.08 times.

[0090] It should be noted that different types of battery devices may have different or the same discharge current values.

[0091] An energy storage system may include one PCS or multiple PCS. In the case of an energy storage system including multiple PCS, capability testing can be performed by controlling the output current or power of one PCS and controlling the received current or power of at least some of the other PCS.

[0092] During the ability test, such as Figure 3 As shown, energy can flow between different battery systems. Or, as... Figure 4 As shown, energy can flow within the same battery system. Figure 3 and Figure 4 The energy storage system shown includes m PCS, namely the first PCS, the second PCS, ..., the mth PCS.

[0093] A battery cluster is a combination of battery devices connected in series, parallel, or series-parallel configurations. One battery cluster corresponds to one slave battery management unit (SBMU), and multiple battery clusters correspond to one master battery management unit (MBMU).

[0094] The main control box is a box-type structure with control components, which can be programmable logic controllers (PLCs). Besides being electrically connected to the battery packs, the main control box can also be connected to the central control system. The main control box can be used to control and manage one or more battery devices. For example, the main control box can read data such as voltage, current, and temperature of the battery devices during operation. It can also control the on / off state of the battery devices. The main control box may contain core components such as an SBMU (Battery Controller Unit). This SBMU can perform comprehensive monitoring and control of the battery devices, ensuring their safety, longevity, and stable performance. In other embodiments, the main control box may also contain various auxiliary components such as relays, fuses, indicator lights, disconnect switches, current sensors, high-voltage copper bars, and fuses.

[0095] The plurality of PCS may include a first PCS. In some embodiments, where the capability test includes an overcurrent capability test, S220 may specifically include: sending a first instruction to the first PCS based on test parameters, and sending a second instruction to at least a portion of the plurality of PCS other than the first PCS, to perform an overcurrent capability test on the first PCS.

[0096] The first instruction is used to instruct the first PCS to output a target current value, and the second instruction is used to instruct the current value received by at least a portion of the PCS, wherein the sum of the current values ​​received by at least a portion of the PCS is equal to the target current value.

[0097] This technical solution involves testing the overcurrent capability among multiple PCSs. One PCS outputs a high-rate current, while the other PCSs receive the current output by that PCS. This not only effectively tests the high-rate performance of the PCSs, but also reduces the possibility of high-rate operation impacting the power grid by eliminating the need to output energy to the grid during the overcurrent test process, thus promoting the normal operation of the power grid.

[0098] The first PCS can be any one of the multiple PCS, or it can be the first PCS among the multiple PCS, or it can be the last PCS among the multiple PCS.

[0099] At least some of the PCS can be all PCS except the first PCS, or it can be a subset of PCS excluding the first PCS. The current value received by each PCS in at least some of the PCS can be the same or different.

[0100] The second instruction can specifically be used to indicate the current value received by each PCS in at least a portion of the PCS. The sum of the current values ​​received by at least a portion of the PCS can be understood as the sum of the current values ​​received by all PCS in at least a portion of the PCS.

[0101] When the first PCS outputs the target current value, the discharge current value of the battery device corresponding to the first PCS can be between 0.8*n*Id1 and 1.36*n*Id1, where Id1 is the current value of the battery device corresponding to the first PCS when the first PCS outputs the rated current value.

[0102] Similar to the overcurrent capability test, when the capability test includes the overload capability test, S220 may specifically include: sending a third instruction to the first PCS based on the test parameters, and sending a fourth instruction to at least some of the PCS other than the first PCS among the plurality of PCS, in order to perform an overload capability test on the first PCS.

[0103] The third instruction is used to indicate the target power value output by the first PCS, and the fourth instruction is used to indicate the power value received by at least some of the PCS, wherein the sum of the power values ​​received by at least some of the energy storage converters is equal to the target power value.

[0104] This technical solution involves conducting overload capacity tests among multiple PCSs, where one PCS outputs high-rate power and the other PCSs receive the power output from that PCS. This not only effectively tests the high-rate performance of the PCSs, but also reduces the possibility of high-rate operation impacting the grid by eliminating the need to output energy to the grid during the overload test, thus promoting the normal operation of the grid.

[0105] Optionally, the power values ​​received by each PCS in at least a portion of the PCS may be the same or different.

[0106] The third instruction can specifically be used to indicate the power value received by each PCS in at least a portion of the PCS, and the sum of the power values ​​received by at least a portion of the PCS can be understood as the sum of the power values ​​received by all PCS in at least a portion of the PCS.

[0107] When the first PCS outputs the target power value, the discharge current value of the battery device corresponding to the first PCS can be between 1*m*Id2 and 1.36*m*Id2, where Id2 is the current value of the battery device corresponding to the first PCS when the first PCS outputs the rated power value.

[0108] In some embodiments, after the first PCS maintains the target current value or target power value for a target duration, the first PCS may automatically stop outputting current or power.

[0109] The target duration can be preset on the first PCS, so after the target duration is reached, the first PCS can automatically stop outputting current or power.

[0110] Alternatively, method 200 may further include sending a stop output command to a first PCS, the stop output command being used to instruct the first PCS to stop outputting current or power while maintaining the target current value or target power value for a target duration.

[0111] This technical solution ensures that the first PCS stops outputting current or power only after maintaining the target current or power value for the target duration. This allows for more effective testing of the high-rate performance of the first PCS, resulting in more accurate test results. Furthermore, by sending a stop output command to the first PCS to control its current or power output, the timing of the first PCS's output cessation can be adapted to the current operating status of the entire energy storage system, thus facilitating smoother capacity testing.

[0112] Alternatively, the target duration can be determined based on experience.

[0113] Optionally, the target duration can be determined based on some parameters. For example, the target duration can be determined based on n or m, or the target duration can be determined based on the ambient temperature, or the target duration can be determined based on the attribute parameters of the first PCS, or the target duration can be determined based on the number of multiple PCS in the energy storage system.

[0114] The stop output command can be sent simultaneously with the first command, so that the output current or power can be stopped after the first PCS has run for the target duration.

[0115] Alternatively, if the first PCS maintains the target current or target power value for the target duration, a stop output command can be sent to the first PCS. After receiving the stop output command, the first PCS can stop outputting current or power.

[0116] The target duration can be any length. For example, the target duration can be 2 minutes (min), 5 minutes, etc.

[0117] In some embodiments, the target duration may be less than or equal to 1 minute. For example, the target duration may be in the range of 1 second (s) to 1 minute, such as 2s, 10s, 20s, 30s, 40s, or 50s.

[0118] This technical solution sets the target duration to less than or equal to 1 minute, which enables the first PCS to achieve high-rate performance testing in a shorter time, reducing time costs and improving testing efficiency.

[0119] After the overcurrent or overload capacity test of the first PCS is completed, the other PCS in the multiple PCS can be tested sequentially.

[0120] The multiple PCS may also include a second PCS. Furthermore, when the capability test includes an overcurrent capability test, method 200 may also include: when the first PCS stops outputting current, sending a fifth instruction to the second PCS based on test parameters, and sending a sixth instruction to the PCS other than the second PCS among the multiple PCS, to perform an overcurrent capability test on the second PCS.

[0121] The fifth instruction is used to instruct the second PCS to output the target current value, and the sixth instruction is used to instruct the current value received by the PCS other than the second PCS. The sum of the current values ​​received by the PCS other than the second PCS is equal to the target current value.

[0122] This technical solution, after the overcurrent capability test of the first PCS is completed, continues to test the overcurrent capability of the second PCS among multiple PCS, and the testing method is the same as that of the first PCS. That is, the second PCS outputs a high-rate current, and the other PCS receive the current output by the second PCS. In this way, not only is the high-rate performance of the second PCS effectively tested, but also no energy needs to be output to the grid during the test, reducing the possibility of grid impact from high-rate operation and promoting the normal operation of the grid. Furthermore, the capability tests of multiple PCS are performed sequentially, so that the capability tests of multiple PCS can be carried out in an orderly manner.

[0123] Among multiple PCS, the PCS other than the second PCS can be all PCS other than the second PCS, or it can be some PCS other than the second PCS.

[0124] The sixth instruction can specifically be used to indicate the current value received by each PCS other than the second PCS. The sum of the current values ​​received by the PCS other than the second PCS can be understood as the sum of the current values ​​received by all PCS other than the second PCS.

[0125] The specific implementation method for the overcurrent capability test of the second PCS is the same as that for the first PCS. For the sake of brevity, it will not be repeated here.

[0126] When the second PCS outputs the target current value, the discharge current value of the battery device corresponding to the second PCS can be between 0.8*n*Id1 and 1.36*n*Id1, where Id1 is the current value of the battery device corresponding to the second PCS when the second PCS outputs the rated current value.

[0127] After the current-carrying capacity test of the second PCS is completed, the current-carrying capacity test of the third PCS can be carried out, then the current-carrying capacity test of the fourth PCS can be carried out, and so on, until the current-carrying capacity test of all PCS is completed.

[0128] Similar to the second PCS, when the capability test includes an overload capability test, method 200 may further include: when the first PCS stops outputting power, sending a seventh command to the second PCS based on test parameters, and sending an eighth command to the PCS other than the second PCS among the plurality of PCS, to perform an overload capability test on the second PCS.

[0129] The seventh instruction is used to instruct the second PCS to output the target power value, and the eighth instruction is used to instruct the power value received by the PCS other than the second PCS. The sum of the power values ​​received by the PCS other than the second PCS is equal to the target power value.

[0130] This technical solution, after the overload capacity test of the first PCS is completed, continues to test the overload capacity of the second PCS among multiple PCS, and the testing method is the same as that of the first PCS. That is, the second PCS outputs high-rate power, and the other PCS receive the power output by the second PCS. In this way, not only is the high-rate performance of the second PCS effectively tested, but also no energy needs to be output to the grid during the test, reducing the possibility of grid impact from high-rate operation and promoting the normal operation of the grid. Furthermore, the capacity tests of multiple PCS are carried out sequentially, so that the capacity tests of multiple PCS can be carried out in an orderly manner.

[0131] The eighth instruction can specifically be used to indicate the power value received by each PCS other than the second PCS. The sum of the power values ​​received by the PCS other than the second PCS can be understood as the sum of the power values ​​received by all PCS other than the second PCS.

[0132] The specific implementation method for overload capacity testing of the second PCS is the same as that for overload capacity testing of the first PCS, and will not be repeated here for the sake of brevity.

[0133] When the second PCS outputs the target power value, the discharge current value of the battery device corresponding to the second PCS can be between 1*m*Id2 and 1.36*m*Id2, where Id2 is the current value of the battery device corresponding to the second PCS when the second PCS outputs the rated power value.

[0134] After the overload capacity test of the second PCS is completed, the overload capacity test of the third PCS can be carried out, then the overload capacity test of the fourth PCS, and so on, until all PCS have completed the overload capacity test.

[0135] It should be noted that the capability test in this application embodiment can be conducted during power plant maintenance or operation.

[0136] The following is combined Figure 5 This application describes a specific implementation of an embodiment. Figure 5 For the overcurrent capacity test, the energy storage system includes m PCS, namely PCS1, PCS2, PCS3...PCSm, with a target duration of q seconds.

[0137] In 501, EMS calculates the test parameters for overcurrent capacity testing.

[0138] In step 502, EMS sends the first instruction to PCS1.

[0139] The first instruction is used to instruct PCS1 to output n times the rated AC current value.

[0140] In step 503, EMS sends a second instruction to PCS2 through PCSm.

[0141] The second instruction is used to instruct each PCS from PCS2 to PCSm to input (1 / (m-1)) times the rated AC current value.

[0142] In 504, EMS sends a current command to PCS1.

[0143] The current command is used to instruct the first discharge current value of the battery device 1 corresponding to PCS1 to be increased to between 0.8n and 1.36n times.

[0144] In error 505, EMS determines whether PCS1 has run for q seconds.

[0145] If PCS1 has run for q seconds, proceed to step 506. If the continuous running time of PCS1 has not reached q seconds, proceed to step 502.

[0146] In step 506, the EMS sends a stop output command to PCS1 and battery device 1.

[0147] This concludes the overcurrent capability test process for PCS1.

[0148] The following is combined Figure 6 Another specific implementation of the embodiments of this application is described below. Figure 6 For overload capacity testing, the energy storage system consists of m PCS, namely PCS1, PCS2, PCS3...PCSm, with a target duration of q seconds.

[0149] In 601, EMS calculates the test parameters for overload capacity testing.

[0150] In step 602, EMS sends a third instruction to PCS1.

[0151] The third instruction is used to instruct PCS1 to output m times the AC rated power value.

[0152] In 603, EMS sends the fourth instruction to PCS2 through PCSm.

[0153] The fourth instruction is used to instruct each PCS from PCS2 to PCSm to input (1 / (m-1)) times the AC rated power value.

[0154] In 604, EMS sends a current command to PCS1.

[0155] The current command is used to instruct the second discharge current value of the battery device 1 corresponding to PCS1 to be increased to between m and 1.36m times.

[0156] In step 605, EMS determines whether PCS1 has run for q seconds.

[0157] If PCS1 has run for q seconds, proceed to step 606. If the continuous running time of PCS1 has not reached q seconds, proceed to step 602.

[0158] In step 606, the EMS sends a stop output command to PCS1 and battery device 1.

[0159] This concludes the overload capacity test process for PCS1.

[0160] In the embodiments of this application, the order of the above-mentioned process numbers does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0161] Furthermore, without conflict, the various embodiments and / or technical features described in this application can be arbitrarily combined with each other, and the resulting technical solutions should also fall within the protection scope of this application.

[0162] The method for testing the capacity of an energy storage system according to embodiments of this application has been described in detail above. The apparatus for testing the capacity of an energy storage system according to embodiments of this application will now be described. It should be understood that the apparatus for testing the capacity of an energy storage system according to embodiments of this application can execute the method for testing the capacity of an energy storage system according to embodiments of this application.

[0163] Figure 7 A schematic block diagram of an apparatus 700 for testing the capability of a first energy storage system according to an embodiment of this application is shown. Figure 7 As shown, the device 700 for testing the capacity of the first energy storage system may include: The processing unit 710 is used to acquire test parameters, the test parameters including a target current value or a target power value, the target current value being n times the rated current value of the energy storage converter in the energy storage system, the target power value being m times the rated power value of the energy storage converter, where n is greater than or equal to 3, and / or m is greater than or equal to 3.

[0164] The test unit 720 is used to perform a capability test on the energy storage converter based on the test parameters.

[0165] Optionally, in this embodiment of the application, the capability test includes an overcurrent capability test, and the discharge current value of the battery device corresponding to the energy storage converter is in the range of 0.8*n*Id1 to 1.36*n*Id1, where Id1 is the current value of the battery device when the energy storage converter outputs the rated current value.

[0166] Optionally, in this embodiment of the application, the capability test includes an overload capability test, and the discharge current value of the battery device corresponding to the energy storage converter is in the range of 1*m*Id2 to 1.36*m*Id2, where Id2 is the current value of the battery device when the energy storage converter outputs the rated power value.

[0167] Optionally, in this embodiment of the application, the apparatus 700 for testing the capability of the first energy storage system further includes: a communication unit for sending a current command to the battery device, the current command being used to indicate the discharge current value of the battery device.

[0168] Optionally, in this embodiment of the application, the energy storage system includes a plurality of energy storage converters, the plurality of energy storage converters including a first energy storage converter, and the device 700 for testing the capability of the first energy storage system further includes: a communication unit, configured to send a first instruction to the first energy storage converter and a second instruction to at least some of the plurality of energy storage converters other than the first energy storage converter when the capability test includes an overcurrent capability test, to perform an overcurrent capability test on the first energy storage converter; wherein, the first instruction is used to instruct the first energy storage converter to output the target current value, the second instruction is used to instruct the at least some energy storage converters to receive the current value, and the sum of the current values ​​received by the at least some energy storage converters is equal to the target current value.

[0169] Optionally, in this embodiment of the application, the energy storage system includes a plurality of energy storage converters, the plurality of energy storage converters including a first energy storage converter, and the device 700 for testing the capacity of the first energy storage system further includes: a communication unit, configured to send a third instruction to the first energy storage converter and a fourth instruction to at least some of the plurality of energy storage converters other than the first energy storage converter when the capacity test includes an overload capacity test, so as to perform an overload capacity test on the first energy storage converter; wherein, the third instruction is used to instruct the first energy storage converter to output the target power value, the fourth instruction is used to instruct the power value received by the at least some energy storage converters, and the sum of the power values ​​received by the at least some energy storage converters is equal to the target power value.

[0170] Optionally, in this embodiment of the application, the communication unit is further configured to: send a stop output command to the first energy storage converter, the stop output command being used to instruct the first energy storage converter to stop outputting current or power while maintaining the target current value or the target power value for a target duration.

[0171] Optionally, in this embodiment of the application, the target duration is less than or equal to 1 minute.

[0172] Optionally, in this embodiment of the application, the plurality of energy storage converters includes a second energy storage converter. When the capability test includes an overcurrent capability test, the communication unit is further configured to: when the first energy storage converter stops outputting current, based on the test parameters, send a fifth instruction to the second energy storage converter and a sixth instruction to the energy storage converters other than the second energy storage converter among the plurality of energy storage converters, to perform an overcurrent capability test on the second energy storage converter; wherein the fifth instruction is used to instruct the second energy storage converter to output the target current value, the sixth instruction is used to instruct the energy storage converters other than the second energy storage converter to receive the current value, and the sum of the current values ​​received by the energy storage converters other than the second energy storage converter is equal to the target current value.

[0173] Optionally, in this embodiment of the application, the plurality of energy storage converters includes a second energy storage converter. When the capability test includes an overload capability test, the communication unit is further configured to: when the first energy storage converter stops outputting power, based on the test parameters, send a seventh instruction to the second energy storage converter and an eighth instruction to the energy storage converters other than the second energy storage converter among the plurality of energy storage converters, to perform an overload capability test on the second energy storage converter; wherein the seventh instruction is used to instruct the second energy storage converter to output the target power value, the eighth instruction is used to instruct the energy storage converters other than the second energy storage converter to receive the power value, and the sum of the power values ​​received by the energy storage converters other than the second energy storage converter is equal to the target power value.

[0174] It should be understood that the device 700 for testing the capacity of the first energy storage system can perform the corresponding operations in the method 200 for testing the capacity of the energy storage system, and for the sake of brevity, it will not be described in detail here.

[0175] Figure 8 This is a schematic diagram of the hardware structure of a second energy storage system capability testing device 800 according to an embodiment of this application. The second energy storage system capability testing device 800 includes a memory 810, a processor 820, a communication interface 830, and a bus 840. The memory 810, processor 820, and communication interface 830 are interconnected via the bus 840.

[0176] The memory 810 may be a read-only memory (ROM), a static storage device, or a random access memory (RAM). The memory 810 may store a program, and when the program stored in the memory 810 is executed by the processor 820, the processor 820 and the communication interface 830 are used to execute the various steps of the energy storage system capability testing method of the embodiments of this application.

[0177] The processor 820 may be a general-purpose central processing unit (CPU), microprocessor, application-specific integrated circuit (ASIC), graphics processing unit (GPU), or one or more integrated circuits, used to execute relevant programs to achieve the functions required by the units in the second energy storage system capability testing apparatus 800 of this application embodiment, or to execute the energy storage system capability testing method of this application embodiment.

[0178] The processor 820 can also be an integrated circuit chip with signal processing capabilities. In implementation, each step of the energy storage system capability testing method of this application embodiment can be completed by the integrated logic circuitry in the processor 820 or by software instructions.

[0179] The processor 820 described above can also be a general-purpose processor, a digital signal processor (DSP), an ASIC, a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of this application. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the methods disclosed in the embodiments of this application can be directly implemented by the hardware processor, or implemented by a combination of hardware and software modules in the processor. The software modules can be located in random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, or other mature storage media in the art. This storage medium is located in memory 810. The processor 820 reads the information in memory 810 and, in conjunction with its hardware, completes the functions required by the units included in the second energy storage system capability testing apparatus 800 of the embodiments of this application, or executes the energy storage system capability testing method of the embodiments of this application.

[0180] The communication interface 830 uses a transceiver device, such as but not limited to a transceiver, to enable communication between the second energy storage system capability testing device 800 and other devices or communication networks.

[0181] Bus 840 may include a pathway for transmitting information between various components (e.g., memory 810, processor 820, communication interface 830) of the second energy storage system capability testing device 800.

[0182] It should be noted that although the above-described apparatus 800 for testing the capability of the second energy storage system only shows a memory, processor, and communication interface, those skilled in the art should understand that in specific implementations, the apparatus 800 for testing the capability of the second energy storage system may also include other devices necessary for normal operation. Furthermore, depending on specific needs, those skilled in the art should understand that the apparatus 800 for testing the capability of the second energy storage system may also include hardware devices for implementing other additional functions. In addition, those skilled in the art should understand that the apparatus 800 for testing the capability of the second energy storage system may only include the devices necessary for implementing the embodiments of this application, and may not necessarily include... Figure 8 All the devices shown.

[0183] Optionally, the device 700 for testing the capability of the first energy storage system or the device 800 for testing the capability of the second energy storage system can be embedded in existing charge / discharge machines or electrochemical workstations, or it can be embedded in specialized testing equipment.

[0184] like Figure 9 As shown in the figure, this application embodiment also provides an energy storage system 900, which includes an energy storage converter 910 and a third energy storage system capability testing device 920, which is used to perform capability testing on the energy storage converter.

[0185] Optionally, the capability test may include overcurrent capability test or overload capability test.

[0186] Optionally, the third energy storage system capability testing device 920 can be the first energy storage system capability testing device 700 or the second energy storage system capability testing device 800.

[0187] This application also provides a computer-readable storage medium for storing a computer program for performing the methods described in the various embodiments of this application.

[0188] The aforementioned computer-readable storage medium may be a transient computer-readable storage medium or a non-transitory computer-readable storage medium.

[0189] This application also provides a computer program product, which includes a computer program stored on a computer-readable storage medium. The computer program includes program instructions that, when executed by a computer, cause the computer to perform the above-described method for testing the energy storage system's capability.

[0190] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A method for testing the capacity of an energy storage system, characterized in that, The method includes: Obtain test parameters, including target current value or target power value, wherein the target current value is n times the rated current value of the energy storage converter in the energy storage system, and the target power value is m times the rated power value of the energy storage converter, where n is greater than or equal to 3, and / or m is greater than or equal to 3; Based on the test parameters, the energy storage converter is subjected to a capability test.

2. The method according to claim 1, characterized in that, The capability test includes an overcurrent capability test. The discharge current value of the battery device corresponding to the energy storage converter is between 0.8*n*Id1 and 1.36*n*Id1, where Id1 is the current value of the battery device when the energy storage converter outputs the rated current value.

3. The method according to claim 1, characterized in that, The capability test includes an overload capability test. The discharge current value of the battery device corresponding to the energy storage converter is between 1*m*Id2 and 1.36*m*Id2, where Id2 is the current value of the battery device when the energy storage converter outputs its rated power value.

4. The method according to claim 2 or 3, characterized in that, The method further includes: A current command is sent to the battery device, the current command indicating the discharge current value of the battery device.

5. The method according to claim 1, characterized in that, The energy storage system includes multiple energy storage converters, and the multiple energy storage converters include a first energy storage converter. When the capability test includes an overcurrent capability test, the capability test of the energy storage converter based on the test parameters includes: Send a first instruction to the first energy storage converter and send a second instruction to at least some of the energy storage converters other than the first energy storage converter among the plurality of energy storage converters, so as to perform an overcurrent capacity test on the first energy storage converter. Wherein, the first instruction is used to instruct the first energy storage converter to output the target current value, and the second instruction is used to instruct the current value received by at least a portion of the energy storage converters, wherein the sum of the current values ​​received by at least a portion of the energy storage converters is equal to the target current value.

6. The method according to claim 1, characterized in that, The energy storage system includes multiple energy storage converters, and the multiple energy storage converters include a first energy storage converter. When the capacity test includes an overload capacity test, the capacity test of the energy storage converter based on the test parameters includes: Send a third instruction to the first energy storage converter and a fourth instruction to at least some of the energy storage converters other than the first energy storage converter, to perform an overload capacity test on the first energy storage converter. The third instruction is used to instruct the first energy storage converter to output the target power value, and the fourth instruction is used to instruct the power value received by at least some of the energy storage converters, wherein the sum of the power values ​​received by at least some of the energy storage converters is equal to the target power value.

7. The method according to claim 5 or 6, characterized in that, The method further includes: A stop output command is sent to the first energy storage converter, the stop output command being used to instruct the first energy storage converter to stop outputting current or power while maintaining the target current value or the target power value for a target duration.

8. The method according to claim 7, characterized in that, The target duration is less than or equal to 1 minute.

9. The method according to claim 7, characterized in that, The plurality of energy storage converters includes a second energy storage converter. When the capability test includes an overcurrent capability test, the capability test of the energy storage converter based on the test parameters includes: When the first energy storage converter stops outputting current, based on the test parameters, a fifth command is sent to the second energy storage converter, and a sixth command is sent to the energy storage converters other than the second energy storage converter among the plurality of energy storage converters, so as to perform an overcurrent capacity test on the second energy storage converter. The fifth instruction is used to instruct the second energy storage converter to output the target current value, and the sixth instruction is used to instruct the current value received by the energy storage converters other than the second energy storage converter, wherein the sum of the current values ​​received by the energy storage converters other than the second energy storage converter is equal to the target current value.

10. The method according to claim 7, characterized in that, The plurality of energy storage converters includes a second energy storage converter. When the capability test includes an overload capability test, the capability test of the energy storage converter based on the test parameters includes: When the first energy storage converter stops outputting power, based on the test parameters, a seventh command is sent to the second energy storage converter, and an eighth command is sent to the energy storage converters other than the second energy storage converter among the plurality of energy storage converters, so as to perform an overload capacity test on the second energy storage converter. The seventh instruction is used to instruct the second energy storage converter to output the target power value, and the eighth instruction is used to instruct the power value received by the energy storage converters other than the second energy storage converter, wherein the sum of the power values ​​received by the energy storage converters other than the second energy storage converter is equal to the target power value.

11. An apparatus for testing the capacity of an energy storage system, characterized in that, The device includes: The processing unit is used to acquire test parameters, the test parameters including a target current value or a target power value, wherein the target current value is n times the rated current value of the energy storage converter in the energy storage system, and the target power value is m times the rated power value of the energy storage converter, where n is greater than or equal to 3, and / or m is greater than or equal to 3; The testing unit is used to perform capability testing on the energy storage converter based on the test parameters.

12. A device for testing the capacity of an energy storage system, characterized in that, The energy storage system includes multiple energy storage converters, and the device includes: Memory, used to store programs; A processor for executing a program stored in the memory, wherein when the program stored in the memory is executed, the processor is configured to perform a method for testing the capacity of an energy storage system according to any one of claims 1 to 10.

13. An energy storage system, characterized in that, include: Energy storage converter; The apparatus for testing the capacity of an energy storage system according to claim 11 or 12 is used to test the capacity of the energy storage converter.

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