Hardware-in-the-loop test method and device for control system of network construction type energy storage equipment

Abstract

The invention discloses a semi-physical test method and device for a network-forming type energy storage equipment control system. The method is executed on a semi-physical test platform comprising a network construction type energy storage equipment control system and an energy storage converter physical hardware loop, and specifically comprises the following steps: carrying out a no-load voltage step response test and a voltage closed-loop control test on the network construction type energy storage equipment control system step by step to obtain a no-load test result; gradually performing an active closed-loop control test, a primary frequency modulation test, an inertia test and a damping control test on the network-forming energy storage equipment control system to obtain a load test result; and according to the no-load test result and the load test result, determining the performance of the network construction type energy storage equipment control system.

Description

Technical Field

[0001] This invention relates to the field of grid-type energy storage equipment control technology, and more specifically, to a semi-physical testing method and apparatus for a grid-type energy storage equipment control system. Background Technology

[0002] As a core technology supporting the stable operation of new power systems, grid-connected controllers have moved from pilot verification to large-scale commercialization, becoming a key path to address the challenges of grid integration with high proportions of renewable energy and power electronic equipment. Their core value lies in proactively providing virtual inertia, voltage support, and rapid frequency regulation capabilities by simulating the characteristics of synchronous generators. This overcomes the pain points of traditional grid-connected equipment, which relies heavily on a strong power grid and has weak support capabilities, thus promoting the transformation of renewable energy from a "supplementary power source" to a "main power source."

[0003] Currently, there is no unified understanding in the industry regarding the implementation of voltage support methods, controlled variables, and control methods for grid-based energy storage control systems, and the technical approaches are not unique. Patent CN 114944663 B, titled "A Control Method and System for Energy Storage System Based on Grid-Based Converter," proposes a grid-based control strategy for energy storage converters based on synchronous generator control. This strategy mainly includes functions such as voltage / active power closed-loop control, primary frequency regulation, and inertia / damping control, enabling the energy storage converter to support voltage, frequency, and inertia. However, testing whether grid-based energy storage devices possess the characteristics of patent CN 114944663B requires semi-physical testing. Currently, semi-physical testing methods are not mature and do not consider the requirements of grid operation. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a semi-physical testing method and apparatus for a grid-type energy storage device control system.

[0005] According to one aspect of the present invention, a semi-physical test method for a grid-type energy storage device control system is provided, which is executed on a semi-physical test platform including the grid-type energy storage device control system and the physical hardware circuit of the energy storage converter, specifically including: The no-load voltage step response test and voltage closed-loop control test were carried out stepwise on the control system of the grid-type energy storage equipment to obtain the no-load test results. The active power closed-loop control test, primary frequency regulation test, inertia test and damping control test were carried out step by step on the control system of the grid-type energy storage equipment to obtain the load test results. The performance of the grid-type energy storage equipment control system was determined based on the results of the no-load test and the load test.

[0006] Optionally, the no-load voltage step response test procedure includes: In off-grid mode, control the energy storage converter to output the rated voltage; By changing the voltage setpoint through grid-type energy storage devices, a voltage step of ±5% relative to the rated voltage can be achieved. Record the voltage waveform at the end of the energy storage converter to verify the voltage closed-loop control function and the ability to regulate the voltage rise time.

[0007] Optionally, the voltage closed-loop control test steps include: In off-grid mode, the voltage change rate is set through grid-connected energy storage devices; The terminal voltage of the energy storage converter is adjusted from 0% to 110% of the rated voltage, and then from 110% to 0% of the rated voltage, with step changes at 10% intervals of the rated voltage, and the stabilization time is set at each point. The entire adjustment process was recorded to verify the continuous adjustment accuracy and control strategy of the voltage closed loop.

[0008] Optionally, the active power closed-loop control test specifically includes: In grid-connected mode, set the active power change rate; The energy storage converter is controlled to adjust its output active power from zero to rated power and then from rated power back to zero under charging or discharging conditions, with step changes at intervals of 25% of rated active power, and a stable set duration at each point. The entire adjustment process was recorded to verify the continuous adjustment accuracy and control strategy of the active power closed loop.

[0009] Optionally, the primary frequency modulation test specifically includes: When the grid is connected and the primary frequency regulation function of the energy storage converter is engaged, under different charging or discharging conditions, the grid-type energy storage device control system applies frequency steps of ±0.1Hz and ±0.2Hz to the frequency setpoint. Record the changes in frequency and active power to verify whether the primary frequency regulation response capability of the grid-type energy storage equipment control system meets the preset standard.

[0010] Optionally, the inertia test specifically includes: In grid-connected mode, the primary frequency regulation function is deactivated and the energy storage converter is initially output at rated power. In the control system of grid-type energy storage equipment, an inertial time constant Tj is set; The analog system power supply frequency decreases from the rated value to the first frequency value at a constant rate of change, remains at the rated value for a period of time, then returns to the rated value, then increases from the rated value to the second frequency value, remains at the rated value for a period of time, and then returns to the rated value. Change the set value of the inertial time constant and repeat the above steps; The adjustment process of frequency and active power is recorded to verify whether the change in active power is proportional to the inertial time constant, and to verify the inertia support capability.

[0011] Optionally, the constant rate of change is 0.5 Hz / s, the first frequency value is 49.2 Hz, the second frequency value is 50.8 Hz, and the duration is 10 seconds.

[0012] Optionally, the damping control test specifically includes: In grid-connected mode, the primary frequency regulation function is deactivated, allowing the energy storage converter to initially output its rated power. Set the damping coefficient in the control system of grid-type energy storage equipment; Apply a three-phase voltage dip fault to the power grid model in the hardware-in-the-loop test platform and maintain it for a set duration; Change the damping coefficient setting and repeat the above steps; Record the voltage, active power, and reactive power curves at the grid connection point to verify the differences in transient stability of the system under different damping coefficients.

[0013] Optionally, the duration of a three-phase voltage dip fault is 0.15 seconds.

[0014] According to another aspect of the present invention, a semi-physical test apparatus for a grid-type energy storage device control system is provided, comprising: The first test module is used to perform no-load voltage step response test and voltage closed-loop control test on the control system of the grid-type energy storage equipment stepwise to obtain the no-load test results. The second test module is used to perform active closed-loop control test, primary frequency regulation test, inertia test and damping control test on the control system of grid-type energy storage equipment step by step, and obtain the load test results. The determination module is used to determine the performance of the grid-type energy storage equipment control system based on the results of no-load test and load test.

[0015] Optionally, the no-load voltage step response test procedure includes: In off-grid mode, control the energy storage converter to output the rated voltage; By changing the voltage setpoint through grid-type energy storage devices, a voltage step of ±5% relative to the rated voltage can be achieved. Record the voltage waveform at the end of the energy storage converter to verify the voltage closed-loop control function and the ability to regulate the voltage rise time.

[0016] Optionally, the voltage closed-loop control test steps include: In off-grid mode, the voltage change rate is set through grid-connected energy storage devices; The terminal voltage of the energy storage converter is adjusted from 0% to 110% of the rated voltage, and then from 110% to 0% of the rated voltage, with step changes at 10% intervals of the rated voltage, and the stabilization time is set at each point. The entire adjustment process was recorded to verify the continuous adjustment accuracy and control strategy of the voltage closed loop.

[0017] Optionally, the active power closed-loop control test specifically includes: In grid-connected mode, set the active power change rate; The energy storage converter is controlled to adjust its output active power from zero to rated power and then from rated power back to zero under charging or discharging conditions, with step changes at intervals of 25% of rated active power, and a stable set duration at each point. The entire adjustment process was recorded to verify the continuous adjustment accuracy and control strategy of the active power closed loop.

[0018] According to another aspect of the present invention, a computer-readable storage medium is provided, the storage medium storing a computer program for performing the methods described in any of the above aspects of the present invention.

[0019] According to another aspect of the present invention, an electronic device is provided, the electronic device comprising: a processor; a memory for storing executable instructions of the processor; the processor being configured to read the executable instructions from the memory and execute the instructions to implement the method described in any of the preceding aspects of the present invention.

[0020] Therefore, this invention, in conjunction with the requirements of power grid operation, verifies whether grid-connected equipment has the support of inertia, voltage, and corresponding frequency regulation capabilities; it also provides a basic testing method for the research and development of grid-connected energy storage equipment and the testing of equipment for grid connection. Attached Figure Description

[0021] Exemplary embodiments of the present invention can be more fully understood by referring to the following figures: Figure 1 This is a schematic flowchart of a semi-physical test method for a grid-type energy storage device control system provided in an exemplary embodiment of the present invention; Figure 2 This is a schematic diagram of the voltage recording at the port of a grid-type energy storage system provided in an exemplary embodiment of the present invention; Figure 3 This is a schematic diagram of the voltage recording at the port of a grid-type energy storage system provided in an exemplary embodiment of the present invention; Figure 4 This is a schematic diagram of the port voltage and active power of a grid-type energy storage system provided in an exemplary embodiment of the present invention; Figure 5This is a schematic diagram of the frequency setpoint and port active power of a grid-type energy storage control system provided in an exemplary embodiment of the present invention; Figure 6 This is a schematic diagram of the system frequency and active power of the grid-connected energy storage port provided in an exemplary embodiment of the present invention; Figure 7 This is a schematic diagram of the voltage, active power, and reactive power curves of the grid-connected energy storage port provided in an exemplary embodiment of the present invention; Figure 8 This is a schematic diagram of the structure of a semi-physical test device for a grid-type energy storage device control system provided in an exemplary embodiment of the present invention; Figure 9 This is the structure of an electronic device provided in an exemplary embodiment of the present invention. Detailed Implementation

[0022] Hereinafter, exemplary embodiments according to the present invention will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of the present invention, and not all embodiments of the present invention. It should be understood that the present invention is not limited to the exemplary embodiments described herein.

[0023] It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention.

[0024] Those skilled in the art will understand that the terms "first," "second," etc., in the embodiments of the present invention are only used to distinguish different steps, devices, or modules, and do not represent any specific technical meaning, nor do they indicate a necessary logical order between them.

[0025] It should also be understood that in the embodiments of the present invention, "multiple" can refer to two or more, and "at least one" can refer to one, two or more.

[0026] It should also be understood that any component, data or structure mentioned in the embodiments of the present invention can generally be understood as one or more unless explicitly defined or given contrary instructions in the context.

[0027] Furthermore, the term "and / or" in this invention is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this invention generally indicates that the preceding and following related objects have an "or" relationship.

[0028] It should also be understood that the description of the various embodiments in this invention emphasizes the differences between the various embodiments, and the similarities or similarities can be referred to each other. For the sake of brevity, they will not be described in detail.

[0029] At the same time, it should be understood that, for ease of description, the dimensions of the various parts shown in the accompanying drawings are not drawn according to actual scale.

[0030] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0031] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0032] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0033] The embodiments of this invention can be applied to electronic devices such as terminal devices, computer systems, and servers, and can operate together with a wide range of other general-purpose or special-purpose computing system environments or configurations. Well-known examples of terminal devices, computing systems, environments, and / or configurations suitable for use with electronic devices such as terminal devices, computer systems, and servers include, but are not limited to: personal computer systems, server computer systems, thin clients, thick clients, handheld or laptop devices, microprocessor-based systems, set-top boxes, programmable consumer electronics, network PCs, minicomputer systems, mainframe computer systems, and distributed cloud computing environments including any of the above systems, etc.

[0034] Electronic devices such as terminal devices, computer systems, and servers can be described in the general context of computer system executable instructions (such as program modules) executed by a computer system. Typically, program modules can include routines, programs, object programs, components, logic, data structures, etc., which perform specific tasks or implement specific abstract data types. Computer systems / servers can be implemented in distributed cloud computing environments, where tasks are executed by remote processing devices linked through communication networks. In distributed cloud computing environments, program modules can reside on local or remote computing system storage media, including storage devices.

[0035] Exemplary methods Figure 1 This is a schematic flowchart of a semi-physical testing method for a grid-type energy storage device control system provided in an exemplary embodiment of the present invention. This embodiment can be applied to electronic devices, such as… Figure 1 As shown, the semi-physical test method 100 for the control system of a grid-type energy storage device includes the following steps: Step 101: Perform no-load voltage step response test and voltage closed-loop control test on the control system of the grid-type energy storage equipment stepwise to obtain the no-load test results; Step 102: Perform active closed-loop control test, primary frequency regulation test, inertia test and damping control test on the control system of the grid-type energy storage equipment step by step, and obtain the load test results. Step 103: Determine the performance of the grid-type energy storage equipment control system based on the no-load test results and the load test results.

[0036] Specifically, this invention proposes a testing method for the grid-connected control system proposed in patent number CN 114944663B, taking into account the needs of the power grid. The semi-physical testing method for the grid-connected energy storage device control system includes two parts: no-load test and load test. The no-load test mainly includes: no-load voltage step response test and voltage closed-loop control test; the load test mainly includes: active power closed-loop control test, primary frequency regulation test, inertia test, and damping control test.

[0037] (1) No-load voltage step response test In off-grid mode, the energy storage converter is boosted to the rated voltage. By changing the voltage setpoint, a ±5% voltage step is performed, and the voltage waveform at the end of the energy storage converter is recorded.

[0038] The no-load voltage step response test is an experimental method to verify that the energy storage converter can independently generate voltage and frequency, and it is a fundamental verification of the grid-connected capability of the energy storage device control system. Through this test, it can be verified whether the voltage is under closed-loop control, and the voltage rise time can also be adjusted according to grid demand.

[0039] Voltage closed-loop control test When the equipment is in an off-grid state, the voltage change rate is set, and the terminal voltage is adjusted from 0% to 110% of the rated voltage, and then from 110% to 0% of the rated voltage, with an interval of 10% of the rated voltage. The stabilization time at each point is 20 seconds, and the adjustment process is recorded.

[0040] Voltage closed-loop control testing verifies the accuracy of the voltage closed-loop control of the energy storage converter and the diversity of its control strategies. This experiment verifies whether the voltage closed-loop control possesses continuous regulation capabilities and can adjust the voltage according to grid demand.

[0041] (3) Active power closed-loop control test The equipment is in grid-connected state. Under different charging and discharging conditions, the active power of the energy storage converter is adjusted from zero power to rated power and then from rated power to zero power by changing the active power change rate of the energy storage converter, with an interval of 25% of rated active power. The stabilization time at each point is 20 seconds, and the adjustment process is recorded.

[0042] Active power closed-loop control testing verifies the accuracy of active power control in energy storage converters and the diversity of control strategies. This experiment verifies whether the active power closed-loop control possesses continuous regulation capabilities and can adjust active power according to grid demand.

[0043] (4) Primary frequency modulation test The equipment is in grid-connected state. Under different charging and discharging conditions, frequency regulation is activated once, and frequency steps of ±0.1Hz and ±0.2Hz are made on the frequency setpoint of the energy storage converter, and the change process is recorded.

[0044] The primary frequency regulation test verifies the frequency response capability that the energy storage converter should possess. Through this experiment, it can be verified whether the primary frequency regulation meets the grid requirements (GB / T 40595 Technical Specifications and Test Guidelines for Primary Frequency Regulation of Grid-Connected Power Sources).

[0045] (5) Inertia test The equipment is in grid-connected mode. Under different charging and discharging conditions, the primary frequency regulation function is deactivated, and the energy storage converter maintains the rated output voltage and rated frequency. The active power of the energy storage converter is adjusted to ±0.5Pn. In the energy storage converter control system, the inertial time constant Tj is set, and the system power frequency is set to change at a rate of 0.5 Hz / s, decreasing from 50 Hz to 49.2 Hz, lasting for 10 s, and then returning to 50 Hz. Then, it increases from 50 Hz to 50.8 Hz, lasting for 10 s, and then returns to 50 Hz. The above test is repeated with different inertial time constants, and the frequency and active power adjustment process is recorded.

[0046] Inertia testing verifies that the energy storage converter should possess inertia support capabilities. This experiment verifies whether the power output is proportional to the inertia setting when the frequency changes, as shown in the following formula: .

[0047] (6) Damping control test In grid-connected mode, disable the primary frequency regulation function, set the damping coefficient in the energy storage converter control system, and maintain the rated output voltage and rated frequency. Adjust the active power of the energy storage converter to ±0.5Pn. Then conduct a three-phase voltage drop test, with the fault lasting for 0.15s. Set different damping coefficients and repeat the above test, recording the voltage, active power and reactive power curves at the grid connection point.

[0048] Damping control testing verifies that the energy storage converter should possess damping control functionality. This experiment demonstrates that the stability of a grid-connected energy storage system varies under different damping coefficients. Different damping parameters can be set according to the different grid requirements where the grid-connected energy storage system is located, thereby improving system stability.

[0049] In a specific embodiment of the present invention, a semi-physical test of a 1.25MW grid-connected energy storage controller is used as an example to further illustrate the present invention in detail, but the present invention is not limited to the example given.

[0050] The test records for the hardware-in-the-loop test method for the grid-type energy storage device control system provided by this invention are as follows: 1. No-load voltage step response test In off-grid mode, the energy storage converter boosts the voltage to its rated voltage. By changing the voltage setpoint, a ±5% voltage step is performed, and the voltage waveform at the converter terminals is recorded. Figure 2 As shown.

[0051] 2. Voltage Closed-Loop Control Test With the equipment in off-grid mode, set the voltage change rate, adjust the terminal voltage from 0% to 110% of the rated voltage, then from 110% to 0% of the rated voltage, with intervals of 10% of the rated voltage. The stabilization time at each point is 20 seconds. Record the adjustment process. Figure 3 As shown.

[0052] 3. Active power closed-loop control With the equipment in grid-connected mode, under different charging and discharging conditions, the active power of the energy storage converter is adjusted from zero power to rated power and then back to zero power, with intervals of 25% of rated active power. The stabilization time at each point is 20 seconds. The adjustment process is recorded. Figure 4 As shown.

[0053] 4: Primary frequency modulation The equipment is in grid-connected mode. Under different charging and discharging conditions, primary frequency regulation is activated, and frequency steps of ±0.1Hz and ±0.2Hz are made at the frequency setpoint of the energy storage converter. The change process is recorded, such as... Figure 5 As shown.

[0054] 5. Inertia Test The equipment is in grid-connected mode. Under different charging and discharging conditions, the primary frequency regulation function is disabled, and the energy storage converter maintains its rated output voltage and frequency. The active power of the energy storage converter is adjusted to ±0.5Pn. In the energy storage converter control system, an inertial time constant Tj is set. The system power frequency is adjusted at a rate of 0.5 Hz / s, decreasing from 50 Hz to 49.2 Hz, holding for 10 seconds, and then returning to 50 Hz. Then, it is increased from 50 Hz to 50.8 Hz, holding for 10 seconds, and then returning to 50 Hz. Different inertial time constants are set sequentially, and the above test is repeated. The adjustment process of frequency and active power is recorded. Figure 6 As shown in Table 1.

[0055] Table 1 Electrical quantity quality parameters

[0056] 6. Damping Control Test In grid-connected mode, the primary frequency regulation function is disabled, and the energy storage converter maintains its rated output voltage and frequency. The active power of the energy storage converter is adjusted to ±0.5Pn. A three-phase voltage drop test is conducted with the control system set to a damping coefficient, and the fault continues to operate for 0.15. The above test is repeated by setting different damping coefficients sequentially, and the voltage, active power, and reactive power curves at the grid connection point are recorded. Figure 7 As shown.

[0057] Therefore, the semi-physical testing method for the grid-type energy storage device control system provided by this invention also has the following excellent effects: (1) The testing method is simple and clear, and highly feasible; (2) The test results are highly accurate; (3) The control logic of the control system was verified under no-load and load conditions respectively; The basic concepts of grid-type equipment and the voltage, frequency, and inertia support capabilities of grid-type equipment have been fully verified.

[0058] Exemplary device Figure 8 This is a schematic diagram of the structure of a semi-physical test apparatus for a grid-type energy storage device control system provided in an exemplary embodiment of the present invention. Figure 8 As shown, the device 800 includes: The first test module 810 is used to perform no-load voltage step response test and voltage closed-loop control test on the control system of the grid-type energy storage equipment stepwise to obtain no-load test results. The second test module 820 is used to perform active closed-loop control test, primary frequency regulation test, inertia test and damping control test on the control system of the grid-type energy storage equipment step by step, and obtain the load test results. The determination module 830 is used to determine the performance of the grid-type energy storage equipment control system based on the no-load test results and the load test results.

[0059] Optionally, the no-load voltage step response test procedure includes: In off-grid mode, control the energy storage converter to output the rated voltage; By changing the voltage setpoint through grid-type energy storage devices, a voltage step of ±5% relative to the rated voltage can be achieved. Record the voltage waveform at the end of the energy storage converter to verify the voltage closed-loop control function and the ability to regulate the voltage rise time.

[0060] Optionally, the voltage closed-loop control test steps include: In off-grid mode, the voltage change rate is set through grid-connected energy storage devices; The terminal voltage of the energy storage converter is adjusted from 0% to 110% of the rated voltage, and then from 110% to 0% of the rated voltage, with step changes at 10% intervals of the rated voltage, and the stabilization time is set at each point. The entire adjustment process was recorded to verify the continuous adjustment accuracy and control strategy of the voltage closed loop.

[0061] Optionally, the active power closed-loop control test specifically includes: In grid-connected mode, set the active power change rate; The energy storage converter is controlled to adjust its output active power from zero to rated power and then from rated power back to zero under charging or discharging conditions, with step changes at intervals of 25% of rated active power, and a stable set duration at each point. The entire adjustment process was recorded to verify the continuous adjustment accuracy and control strategy of the active power closed loop.

[0062] Optionally, the primary frequency modulation test specifically includes: When the grid is connected and the primary frequency regulation function of the energy storage converter is engaged, under different charging or discharging conditions, the grid-type energy storage device control system applies frequency steps of ±0.1Hz and ±0.2Hz to the frequency setpoint. Record the changes in frequency and active power to verify whether the primary frequency regulation response capability of the grid-type energy storage equipment control system meets the preset standard.

[0063] Optionally, the inertia test specifically includes: In grid-connected mode, the primary frequency regulation function is deactivated and the energy storage converter is initially output at rated power. In the control system of grid-type energy storage equipment, an inertial time constant Tj is set; The analog system power supply frequency decreases from the rated value to the first frequency value at a constant rate of change, remains at the rated value for a period of time, then returns to the rated value, then increases from the rated value to the second frequency value, remains at the rated value for a period of time, and then returns to the rated value. Change the set value of the inertial time constant and repeat the above steps; The adjustment process of frequency and active power is recorded to verify whether the change in active power is proportional to the inertial time constant, and to verify the inertia support capability.

[0064] Optionally, the constant rate of change is 0.5 Hz / s, the first frequency value is 49.2 Hz, the second frequency value is 50.8 Hz, and the duration is 10 seconds.

[0065] Optionally, the damping control test specifically includes: In grid-connected mode, the primary frequency regulation function is deactivated, allowing the energy storage converter to initially output its rated power. Set the damping coefficient in the control system of grid-type energy storage equipment; Apply a three-phase voltage dip fault to the power grid model in the hardware-in-the-loop test platform and maintain it for a set duration; Change the damping coefficient setting and repeat the above steps; Record the voltage, active power, and reactive power curves at the grid connection point to verify the differences in transient stability of the system under different damping coefficients.

[0066] Optionally, the duration of a three-phase voltage dip fault is 0.15 seconds.

[0067] Exemplary electronic devices Figure 9 This is the structure of an electronic device provided in an exemplary embodiment of the present invention. For example... Figure 9 As shown, the electronic device 90 includes one or more processors 91 and memory 92.

[0068] The processor 91 may be a central processing unit (CPU) or other form of processing unit with data processing and / or instruction execution capabilities, and may control other components in the electronic device to perform desired functions.

[0069] The memory 92 may include one or more computer program products, which may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. The volatile memory may include, for example, random access memory (RAM) and / or cache memory. The non-volatile memory may include, for example, read-only memory (ROM), hard disk, flash memory, etc. One or more computer program instructions may be stored on the computer-readable storage medium, and the processor 91 may execute the program instructions to implement the methods of the software programs of the various embodiments of the present invention described above, and / or other desired functions. In one example, the electronic device may also include an input device 93 and an output device 94, these components being interconnected via a bus system and / or other forms of connection mechanisms (not shown).

[0070] In addition, the input device 93 may also include, for example, a keyboard, a mouse, etc.

[0071] The output device 94 can output various information to the outside. The output device 94 may include, for example, a display, a speaker, a printer, and a communication network and its connected remote output devices, etc.

[0072] Of course, for the sake of simplicity, Figure 9Only some of the components of this electronic device relevant to the present invention are shown, omitting components such as buses, input / output interfaces, etc. In addition, the electronic device may include any other suitable components depending on the specific application.

[0073] Exemplary computer program products and computer-readable storage media In addition to the methods and apparatus described above, embodiments of the present invention may also be computer program products, which include computer program instructions that, when executed by a processor, cause the processor to perform the steps of the methods according to various embodiments of the present invention described in the "Exemplary Methods" section above.

[0074] The computer program product can be written in any combination of one or more programming languages ​​to perform the operations of the embodiments of the present invention. The programming languages ​​include object-oriented programming languages ​​such as Java and C++, as well as conventional procedural programming languages ​​such as C or similar languages. The program code can be executed entirely on the user's computing device, partially on the user's computing device, as a standalone software package, partially on the user's computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0075] Furthermore, embodiments of the present invention may also be computer-readable storage media storing computer program instructions thereon, which, when executed by a processor, cause the processor to perform the steps of the methods according to various embodiments of the present invention described in the "Exemplary Methods" section above.

[0076] The computer-readable storage medium may be any combination of one or more readable media. A readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may be, for example, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, system, or device, or any combination thereof. More specific examples of readable storage media (a non-exhaustive list) include: an electrical connection having one or more wires, a portable disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0077] The basic principles of the present invention have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in the present invention are merely examples and not limitations, and should not be considered as essential features of each embodiment of the present invention. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the present invention to the necessity of employing the aforementioned specific details.

[0078] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For system embodiments, since they largely correspond to method embodiments, the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments.

[0079] The block diagrams of devices, systems, devices, and systems involved in this invention are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, systems, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0080] The methods and systems of the present invention may be implemented in many ways. For example, they may be implemented by software, hardware, firmware, or any combination of software, hardware, and firmware. The above-described order of steps for the methods is for illustrative purposes only, and the steps of the methods of the present invention are not limited to the order specifically described above unless otherwise specifically stated. Furthermore, in some embodiments, the present invention may also be implemented as a program recorded on a recording medium, the program comprising machine-readable instructions for implementing the methods according to the present invention. Thus, the present invention also covers recording media storing programs for performing the methods according to the present invention.

[0081] It should also be noted that in the systems, apparatus, and methods of the present invention, the components or steps can be disassembled and / or recombined. These disassemblies and / or recombinations should be considered equivalents of the present invention. The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the invention. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of the invention. Therefore, the invention is not intended to be limited to the aspects shown herein, but rather to be carried out within the widest scope consistent with the principles and novel features disclosed herein.

[0082] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of the invention to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. A semi-physical testing method for a grid-type energy storage device control system, characterized in that, The method is executed on a hardware-in-the-loop test platform that includes a grid-type energy storage device control system and an energy storage converter physical hardware circuit, specifically including: The no-load voltage step response test and voltage closed-loop control test were carried out stepwise on the control system of the grid-type energy storage equipment to obtain the no-load test results. The control system of the grid-type energy storage equipment was subjected to active closed-loop control test, primary frequency regulation test, inertia test and damping control test in stages to obtain load test results. Based on the no-load test results and the load test results, the performance of the grid-type energy storage equipment control system is determined.

2. The method according to claim 1, characterized in that, The no-load voltage step response test steps include: In off-grid mode, control the energy storage converter to output the rated voltage; By changing the voltage setpoint through the grid-type energy storage device, a voltage step of ±5% relative to the rated voltage can be achieved. Record the voltage waveform at the end of the energy storage converter to verify the voltage closed-loop control function and the ability to adjust the voltage rise time.

3. The method according to claim 1, characterized in that, The voltage closed-loop control test steps include: In the off-grid state, the voltage change rate is set through the grid-type energy storage device; The terminal voltage of the energy storage converter is adjusted from 0% to 110% of the rated voltage, and then from 110% to 0% of the rated voltage, with step changes at 10% intervals of the rated voltage, and the stabilization time is set at each point. The entire adjustment process was recorded to verify the continuous adjustment accuracy and control strategy of the voltage closed loop.

4. The method according to claim 1, characterized in that, The active power closed-loop control test specifically includes: In grid-connected mode, set the active power change rate; The energy storage converter is controlled to adjust its output active power from zero to rated power and then from rated power back to zero under charging or discharging conditions, with step changes at intervals of 25% of rated active power, and a stable set duration at each point. The entire adjustment process was recorded to verify the continuous adjustment accuracy and control strategy of the active power closed loop.

5. The method according to claim 1, characterized in that, The primary frequency modulation test specifically includes: When the grid is connected and the primary frequency regulation function of the energy storage converter is activated, under different charging or discharging conditions, the grid-type energy storage device control system applies frequency steps of ±0.1Hz and ±0.2Hz to the frequency setpoint. The frequency and active power changes are recorded to verify whether the primary frequency regulation response capability of the grid-type energy storage equipment control system meets the preset standard.

6. The method according to claim 1, characterized in that, The inertia test specifically includes: In grid-connected mode, the primary frequency regulation function is deactivated and the energy storage converter is initially output at rated power. An inertial time constant Tj is set in the control system of the grid-type energy storage device; The analog system power supply frequency decreases from the rated value to the first frequency value at a constant rate of change, remains at the rated value for a period of time, then returns to the rated value, then increases from the rated value to the second frequency value, remains at the rated value for a period of time, and then returns to the rated value. Change the set value of the inertial time constant and repeat the above steps; The adjustment process of frequency and active power is recorded to verify whether the change in active power is proportional to the inertial time constant, and to verify the inertia support capability.

7. The method according to claim 6, characterized in that, The constant rate of change is 0.5 Hz / s, the first frequency value is 49.2 Hz, the second frequency value is 50.8 Hz, and the duration of maintenance is 10 seconds.

8. The method according to claim 1, characterized in that, The damping control test specifically includes: In grid-connected mode, the primary frequency regulation function is deactivated, allowing the energy storage converter to initially output its rated power. A damping coefficient is set in the control system of the grid-type energy storage device; A three-phase voltage dip fault is applied to the power grid model in the semi-physical test platform and maintained for a set duration; Change the set value of the damping coefficient and repeat the above steps; Record the voltage, active power, and reactive power curves at the grid connection point to verify the differences in transient stability of the system under different damping coefficients.

9. The method according to claim 8, characterized in that, The duration of the three-phase voltage drop fault is 0.15 seconds.

10. A semi-physical testing apparatus for a grid-type energy storage device control system, used to implement the method described in any one of claims 1-9, characterized in that, include: The first test module is used to perform no-load voltage step response test and voltage closed-loop control test on the control system of the grid-type energy storage equipment stepwise to obtain the no-load test results. The second test module is used to perform active closed-loop control test, primary frequency regulation test, inertia test and damping control test on the control system of the grid-type energy storage equipment step by step, and obtain the load test results. The determination module is used to determine the performance of the grid-type energy storage equipment control system based on the no-load test results and the load test results.

11. The apparatus according to claim 10, characterized in that, The no-load voltage step response test steps include: In off-grid mode, control the energy storage converter to output the rated voltage; By changing the voltage setpoint through the grid-type energy storage device, a voltage step of ±5% relative to the rated voltage can be achieved. Record the voltage waveform at the end of the energy storage converter to verify the voltage closed-loop control function and the ability to adjust the voltage rise time.

12. The apparatus according to claim 10, characterized in that, The voltage closed-loop control test steps include: In the off-grid state, the voltage change rate is set through the grid-type energy storage device; The terminal voltage of the energy storage converter is adjusted from 0% to 110% of the rated voltage, and then from 110% to 0% of the rated voltage, with step changes at 10% intervals of the rated voltage, and the stabilization time is set at each point. The entire adjustment process was recorded to verify the continuous adjustment accuracy and control strategy of the voltage closed loop.

13. The apparatus according to claim 10, characterized in that, The active power closed-loop control test specifically includes: In grid-connected mode, set the active power change rate; The energy storage converter is controlled to adjust its output active power from zero to rated power and then from rated power back to zero under charging or discharging conditions, with step changes at intervals of 25% of rated active power, and a stable set duration at each point. The entire adjustment process was recorded to verify the continuous adjustment accuracy and control strategy of the active power closed loop.

14. A computer-readable storage medium, characterized in that, The storage medium stores a computer program for performing the method described in any one of claims 1-9.

15. An electronic device, characterized in that, The electronic device includes: processor; Memory used to store the processor's executable instructions; The processor is configured to read the executable instructions from the memory and execute the instructions to implement the method described in any one of claims 1-9.

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