Energy storage converter test method and system and computer equipment

Abstract

The invention discloses an energy storage converter test method and system and computer equipment. The method comprises the following steps: acquiring an energy storage converter test sample; respectively carrying out basic performance test, protection function test, grid-connected and isolated island operation test and fault ride-through capability test on the test sample by utilizing the test platform to obtain test data; building a test standard evaluation model, and inputting test sample data passing the test standard in the past into the test standard evaluation model to form a test data inspection library; and testing the test data through the test data test library, and judging whether the test passes or not. The method covers a plurality of aspects of basic performance test, protection function test, grid-connected and isolated island operation test, fault ride-through capability test and the like, ensures comprehensive evaluation of the energy storage converter under various working conditions, and is helpful to find various possible problems of the converter, thereby improving the reliability and safety of the converter.

Description

Technical Field

[0001] The present invention belongs to the field of new energy technology, and specifically relates to a method, system and computer equipment for testing an energy storage converter. Background Art

[0002] In the field of new energy and power systems, energy storage inverters are key devices that connect energy storage systems to power grids. The stability and reliability of their performance are crucial to ensuring the safe operation of power grids and improving the utilization of new energy. In order to ensure that energy storage inverters can meet design requirements and industry standards, they must be comprehensively and rigorously tested.

[0003] Traditional energy storage inverter testing methods often rely on manual operation and experience judgment. The test items may not be comprehensive enough, and the test results are easily affected by human factors, lacking objectivity and consistency. They also focus on the verification of a single function or indicator and lack a comprehensive testing system, making it difficult to meet the high requirements of energy storage inverters in complex and changeable power grid environments. Summary of the invention

[0004] The purpose of the present invention is to provide a method, system and computer equipment for testing an energy storage converter, so as to solve the technical defects in the prior art that the test method mainly focuses on the verification of a single function or indicator, lacks a comprehensive test system, and is difficult to meet the high requirements of the energy storage converter in the complex and changeable power grid environment.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: In a first aspect, a method for testing an energy storage converter is provided, comprising: Obtain energy storage converter test samples; Using the test platform, the test samples are respectively subjected to basic performance test, protection function test, grid connection and island operation test and fault ride-through capability test to obtain test data; Building a test standard evaluation model, inputting the test sample data that has passed the test standard in the past into the test standard evaluation model to form a test data verification library; The test data is checked through the test data checking library to determine whether the test passes.

[0006] Furthermore, basic performance tests include efficiency test, harmonic test and dynamic response test; Protection function test includes over / under voltage protection test and over current protection test; Grid-connected and island operation tests include grid-connected synchronization test, voltage and frequency control test in island mode; The fault ride-through capability test includes low voltage ride-through test and high voltage ride-through test.

[0007] Furthermore, the efficiency test specifically includes: At different power levels, the input and output power of the energy storage converter is measured, the conversion efficiency is calculated, and the energy loss is evaluated.

[0008] Furthermore, the harmonic test specifically includes: The harmonic content of the output voltage and current is analyzed through Fourier transform.

[0009] Furthermore, the dynamic response test specifically includes: Simulate dynamic conditions such as grid voltage fluctuations and frequency changes to evaluate the response speed and stability of energy storage converters.

[0010] Furthermore, the voltage and frequency control test in the island mode specifically includes: In the simulated island state, test whether the energy storage inverter can accurately identify and quickly disconnect from the grid.

[0011] In a second aspect, an energy storage converter test system is provided, comprising: An acquisition module, used for acquiring energy storage converter test samples; Building modules for building test standard evaluation models; An input module, used to input the test sample data that has passed the test standard in the past into the test standard evaluation model; The verification module is used to verify the test data.

[0012] In a third aspect, a mobile device is provided, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the energy storage converter testing method as described above when executing the computer program.

[0013] In a fourth aspect, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the energy storage converter testing method described above are implemented.

[0014] In a fifth aspect, a computer program product is provided, comprising computer instructions, wherein the computer instructions instruct a computing device to perform operations corresponding to the energy storage converter testing method as described above.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. This method covers multiple aspects such as basic performance testing, protection function testing, grid-connected and island operation testing, and fault ride-through capability testing, ensuring a comprehensive evaluation of the energy storage converter under various working conditions, helping to discover various problems that may exist in the converter, thereby improving its reliability and safety; secondly, by building a test standard evaluation model and inputting the test sample data that has passed the test standard into it to form a test data verification library, a standardized evaluation of the test data is achieved, which helps to eliminate the subjectivity of human judgment and improve the accuracy and consistency of the test results.

[0016] 2. Through comprehensive testing and standardized evaluation, problems with energy storage converters can be discovered in a timely manner, thus improving the reliability of energy storage converters in grid operation.

[0017] 3. By measuring the input and output power of the energy storage inverter at different power levels, its energy conversion efficiency can be accurately calculated, and the performance of the energy storage inverter under different working conditions can be fully understood, providing accurate data support for optimizing design and improving efficiency.

[0018] 4. Harmonics are one of the common power quality problems in power grids. They can cause distortion of voltage and current waveforms and affect the normal operation of power equipment. Harmonic testing can timely detect and deal with harmonic problems, reduce harmonic content, improve power quality, and ensure the stable operation of the power system.

[0019] 5. Voltage fluctuations and frequency changes are common phenomena in actual grid operation. By simulating these dynamic conditions, the response speed of energy storage converters during grid fluctuations can be evaluated, which is crucial to maintaining grid stability and preventing system collapse.

[0020] 6. As a key component of the energy storage system, the island protection function of the energy storage converter is directly related to the safety of the energy storage system. Through testing, it can be ensured that the energy storage converter can take measures quickly and accurately in the island state to protect the energy storage system from damage and avoid possible safety accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 A flow chart of the energy storage converter testing method provided by the present invention; Figure 2This is a schematic diagram of the energy storage converter test system provided by the present invention. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0026] In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, it is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0027] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0028] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] In the field of new energy and power systems, energy storage inverters are key devices that connect energy storage systems to power grids. The stability and reliability of their performance are crucial to ensuring the safe operation of power grids and improving the utilization of new energy. In order to ensure that energy storage inverters can meet design requirements and industry standards, they must be comprehensively and rigorously tested.

[0030] Traditional energy storage inverter testing methods often rely on manual operation and experience judgment. The test items may not be comprehensive enough, and the test results are easily affected by human factors, lacking objectivity and consistency. They also focus on the verification of a single function or indicator and lack a comprehensive testing system, making it difficult to meet the high requirements of energy storage inverters in complex and changeable power grid environments.

[0031] In order to solve the above technical defects, the inventor provides a method, system and computer equipment for testing an energy storage converter.

[0032] The present invention is further described in detail below in conjunction with the accompanying drawings: In a first aspect, an embodiment of the present invention provides a method for testing an energy storage converter, such as Figure 1 As shown, including: S101, obtain energy storage converter test samples; illustratively, first, take the energy storage converter actually used in the power grid as the acquisition scope, combine the actual needs of the power grid operation and the application scenarios of the energy storage converter in the power grid, select a certain number of energy storage converters as test samples, and in the selection process, fully consider the representativeness, diversity and typicality of the energy storage converter to ensure that the test results can fully reflect the actual performance of the energy storage converter in the power grid, and stratified sampling can be carried out according to the power level, technical route, manufacturer, application years and other factors of the energy storage converter to ensure that the test samples can cover the main types and characteristics of the energy storage converter in the power grid. Then determine the specifications and configurations of the required energy storage converter test samples, including power level, input and output voltage range, control strategy and communication interface, etc., to ensure that the test samples can meet the requirements of the power grid operation test. Among them, the power level is to ensure that the test samples can cover the energy storage inverters with different power requirements in the power grid; the input and output voltage range is to verify the performance of the energy storage inverter at different voltage levels; the control strategy is to examine the response speed and accuracy of the energy storage inverter to the power grid instructions; the communication interface is to ensure that the test samples can communicate and interact effectively with the test system and other equipment. By clarifying these specifications and configurations, it can be ensured that the test samples can meet the requirements of the power grid operation test and provide strong support for subsequent testing work.

[0033] S102. Using the test platform, perform basic performance test, protection function test, grid-connected and island operation test and fault ride-through capability test on the test samples to obtain test data; illustratively, the basic performance test includes efficiency test, harmonic test and dynamic response test; the protection function test includes over / under voltage protection test and overcurrent protection test; the grid-connected and island operation test includes grid-connected synchronization test and voltage and frequency control test in island mode; the fault ride-through capability test includes low voltage ride-through test and high voltage ride-through test. Among them, during the efficiency test, by measuring the input and output power of the energy storage converter at different power levels, its energy conversion efficiency can be accurately calculated, and the performance of the energy storage converter under different working conditions can be fully understood, providing accurate data support for optimizing design and improving efficiency; at the same time, the results of the efficiency test can reveal the energy loss of the energy storage converter at different power levels. By analyzing these data, the main sources of energy loss, such as resistance loss and switching loss, can be identified, so as to optimize the design in a targeted manner, reduce energy loss, and improve the overall efficiency of the system. As a key component of the energy storage system, the energy conversion efficiency of the energy storage converter directly affects the operating cost of the system. Through efficiency testing, energy storage converters with higher energy conversion efficiency can be selected to reduce the energy consumption of the system, reduce operating costs, and improve economic benefits. During the harmonic test, Fourier transform is a powerful mathematical tool that can convert signals from the time domain to the frequency domain, thereby accurately analyzing the harmonic components in the output voltage and current, identifying the specific frequency and amplitude of the harmonics, and providing accurate data support for subsequent analysis and processing. Harmonics are one of the common power quality problems in power grids, which can cause distortion of voltage and current waveforms and affect the normal operation of power equipment. Harmonic testing can timely detect and deal with harmonic problems, reduce harmonic content, improve power quality, and ensure the stable operation of power systems. In addition, the results of harmonic testing can reveal the harmonic characteristics generated by energy storage converters under specific working conditions. By analyzing these data, the design of energy storage converters can be optimized, the generation of harmonics can be reduced, and the performance and reliability of equipment can be improved.

[0034] Dynamic response test: In actual grid operation, voltage fluctuations and frequency changes are common phenomena. By simulating these dynamic conditions, the response speed of the energy storage converter when the grid fluctuates can be evaluated. Rapid response capability is essential for maintaining grid stability and preventing system collapse. At the same time, in the dynamic response test, the energy storage converter needs to operate stably under simulated grid fluctuation conditions. This test link helps to discover potential problems of the converter under dynamic conditions, such as the triggering of overvoltage protection, undervoltage protection, overcurrent protection and other mechanisms, thereby ensuring its stability and reliability in actual applications. By analyzing the response characteristics of the energy storage converter under dynamic conditions, the effectiveness of its control strategy can be evaluated, and based on the test results, the control strategy can be optimized to improve the response speed and stability of the converter, and further enhance its application effect in the grid.

[0035] Grid voltage fluctuation is a common phenomenon. Excessively high or low voltage may cause damage to the energy storage inverter and the electrical equipment connected to it. The over / under voltage protection test can verify whether the energy storage inverter can cut off the circuit or adjust the output voltage in time when the voltage is abnormal, thereby effectively preventing equipment damage. Moreover, voltage abnormality may not only damage the equipment, but also pose a safety threat to maintenance personnel. The over / under voltage protection test helps to ensure that the energy storage inverter can quickly take protective measures when the voltage is abnormal, reducing the occurrence of safety accidents such as electric shock.

[0036] The energy storage inverter can maintain the stability of the output voltage when the grid voltage fluctuates through over / undervoltage protection testing, which helps to maintain the overall voltage stability of the grid. In addition, voltage abnormalities may trigger a chain reaction in the grid, leading to larger-scale failures. Over / undervoltage protection testing helps prevent the occurrence of such chain reactions and ensure the reliable operation of the grid.

[0037] The overcurrent protection test can verify whether the energy storage converter can cut off the circuit or adjust the output current in time when the current is overloaded, thereby effectively preventing the equipment from overheating and damage due to current overload. Through the overcurrent protection test, it can be ensured that the energy storage converter can maintain a stable current output in normal operation and fault conditions, thereby extending the service life of the equipment. In addition, through the overcurrent protection test, it can be ensured that the energy storage converter maintains efficient current output during normal operation, thereby improving the efficiency of the entire system; finally, the overcurrent protection test helps to verify the stability and reliability of the energy storage converter under current overload conditions, and enhance the stability of the entire system.

[0038] The grid-connected synchronization test can verify whether the energy storage converter can keep synchronization with the voltage, frequency, and phase of the grid during the grid-connected process, thereby avoiding the huge current shock generated at the moment of grid connection and protecting the safety of the equipment and the grid. Through the grid-connected synchronization test, the grid-connected strategy of the energy storage converter can be optimized, the energy loss in the grid-connected process can be reduced, and the grid-connected efficiency can be improved. As an important part of the power grid, the grid-connected synchronization of the energy storage converter directly affects the voltage, frequency, and phase balance of the power grid. Through the test, it can be ensured that the energy storage converter can stably output electric energy after grid connection and provide reliable power support for the power grid. When the power grid fails or the load fluctuates, the energy storage converter can respond quickly. Through the grid-connected synchronization test, it can be verified whether it can keep synchronization with the power grid under these circumstances, thereby enhancing the resilience and anti-disturbance ability of the power grid. The grid-connected synchronization test can comprehensively evaluate the grid-connected capability of the energy storage converter, including indicators such as grid-connected speed and synchronization accuracy, providing an important basis for the research and development, production, and optimization of the equipment. Through the grid-connected synchronization test, problems existing in the grid-connected process of the energy storage converter can be discovered and solved in a timely manner, and the quality and reliability can be improved. In island mode, the energy storage converter needs to independently undertake the task of supplying power to the local load. Through voltage and frequency control tests, it can be verified whether it can maintain voltage and frequency stability under island operation to prevent damage to load equipment or safety accidents caused by voltage and frequency instability. Stable voltage and frequency are the basis for ensuring power supply quality. Through testing, the control strategy of the energy storage converter in island mode can be optimized to improve power supply quality and meet users' needs for power quality.

[0039] In a second aspect, this embodiment provides an energy storage converter testing system, such as Figure 2 As shown, including: An acquisition module, used for acquiring energy storage converter test samples; Building modules for building test standard evaluation models; An input module, used to input the test sample data that has passed the test standard in the past into the test standard evaluation model; The verification module is used to verify the test data.

[0040] Through the acquisition module, energy storage inverter test samples can be obtained quickly and accurately, avoiding the errors and delays that may be caused by traditional manual sample selection and improving test efficiency.

[0041] Establishing a test standard evaluation model provides a unified and standard evaluation benchmark for the testing of energy storage inverters, helps ensure the objectivity and comparability of test results, and improves the accuracy of the test.

[0042] The input module inputs the test sample data that has passed the test standard in the past into the test standard evaluation model, providing the model with rich historical data support. These data can be used as a reference for new test samples to help the model better understand and predict the performance of the energy storage inverter.

[0043] By verifying the test data through the inspection module, the accuracy and reliability of the test results can be ensured, which facilitates the timely discovery and correction of errors or deviations that may occur during the test process, thereby improving the scientific nature of the test.

[0044] In a third aspect, a mobile device is provided, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the energy storage converter testing method as described above when executing the computer program.

[0045] In a fourth aspect, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the energy storage converter testing method described above are implemented.

[0046] In a fifth aspect, a computer program product is provided, comprising computer instructions, wherein the computer instructions instruct a computing device to perform operations corresponding to the energy storage converter testing method as described above.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit its protection scope. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that after reading the present invention, those skilled in the art can still make various changes, modifications or equivalent substitutions to the specific implementation methods of the invention, but these changes, modifications or equivalent substitutions are all within the protection scope of the pending claims of the invention.

Claims

1. A method for testing an energy storage converter, characterized in that: include: Obtain energy storage converter test samples; Using the test platform, the test samples are respectively subjected to basic performance test, protection function test, grid connection and island operation test and fault ride-through capability test to obtain test data; Building a test standard evaluation model, inputting the test sample data that has passed the test standard in the past into the test standard evaluation model to form a test data verification library; The test data is checked through the test data checking library to determine whether the test passes.

2. The energy storage converter testing method according to claim 1, characterized in that: The basic performance test includes efficiency test, harmonic test and dynamic response test; The protection function test includes over / under voltage protection test and over current protection test; The grid-connected and islanded operation tests include grid-connected synchronization tests and voltage and frequency control tests in islanded mode; The fault ride-through capability test includes a low voltage ride-through test and a high voltage ride-through test.

3. The energy storage converter testing method according to claim 2, characterized in that: The efficiency test specifically includes: At different power levels, the input and output power of the energy storage converter is measured, the conversion efficiency is calculated, and the energy loss is evaluated.

4. The energy storage converter testing method according to claim 2, characterized in that: The harmonic test specifically includes: The harmonic content of the output voltage and current is analyzed through Fourier transform.

5. The energy storage converter testing method according to claim 2, characterized in that: The dynamic response test specifically includes: Simulate dynamic conditions such as grid voltage fluctuations and frequency changes to evaluate the response speed and stability of energy storage converters.

6. The energy storage converter testing method according to claim 2, characterized in that: The voltage and frequency control test in the island mode specifically includes: In the simulated island state, test whether the energy storage inverter can accurately identify and quickly disconnect from the grid.

7. An energy storage converter test system, characterized in that: include: An acquisition module, used for acquiring energy storage converter test samples; Building modules for building test standard evaluation models; An input module, used to input the test sample data that has passed the test standard in the past into the test standard evaluation model; The verification module is used to verify the test data.

8. A mobile device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the energy storage converter testing method according to any one of claims 1 to 6 are implemented.

9. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the energy storage converter testing method according to any one of claims 1 to 6 are implemented.

10. A computer program product comprising computer instructions, characterized in that The computer instructions instruct the computing device to execute operations corresponding to the energy storage converter testing method according to any one of claims 1 to 6.

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