Network construction type converter test system and use method thereof

Abstract

The invention discloses a network construction type converter test system and a use method thereof, and relates to the technical field of power electronic testing, the system comprises a computer control unit, an integrated test equipment unit, a data acquisition unit and a data processing unit; the computer control unit is respectively connected with the integrated test equipment unit, the data acquisition unit and the data processing unit to comprehensively control the whole test process; through automatic control and automatic data processing and analysis, errors caused by manual intervention are effectively avoided, the accuracy of a test result is powerfully guaranteed, in the test process, the computer control unit accurately controls switching-on and switching-off of the circuit breaker set, an exclusive test loop is automatically constructed according to selected test items, and the test efficiency is improved. And possible operation errors caused by manual equipment switching are reduced.

Description

Technical Field

[0001] This invention relates to the field of power electronics testing technology, specifically to a grid-type converter testing system and its usage method. Background Technology

[0002] With the rapid development of power electronics technology, grid-connected converters are playing an increasingly crucial role in power systems. As the core equipment connecting new energy power generation and the power grid, grid-connected converters undertake the important task of efficiently converting and stably outputting electrical energy generated by new energy sources such as photovoltaics and energy storage. Their performance directly affects the stable operation and power quality of the entire power grid. As the scale of new energy power generation continues to expand, the performance requirements for grid-connected converters are becoming increasingly stringent. They not only need to have efficient power conversion capabilities, but also need to demonstrate good adaptability and stability when facing complex and ever-changing power grid conditions, such as power grid faults and frequency fluctuations.

[0003] However, current traditional testing methods for grid-type converters have many drawbacks. First, the testing equipment is extremely dispersed, and different testing items often require different equipment. This not only makes the testing process cumbersome and complex, increasing the workload and operational difficulty for testing personnel, but also easily leads to connection errors and equipment damage during frequent equipment changes, affecting the smooth progress of the test. Second, traditional testing methods rely heavily on manual intervention. From equipment operation and control to data acquisition and processing, each step requires human participation. This not only easily leads to misjudgments or omissions due to human negligence or improper operation, reducing the accuracy of test results, but also results in low efficiency in manual data processing, failing to meet the needs of large-scale, high-efficiency testing. In addition, traditional testing methods cannot meet the type test requirements of relevant technical specifications, and cannot provide a reliable basis for the quality certification and performance evaluation of grid-type converters, seriously restricting the development and application of grid-type converter technology. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a grid-type converter testing system and its usage method. This system organically integrates an integrated testing equipment unit, a data acquisition unit, and a data processing unit through a computer control unit, forming a complete testing system. The integrated testing equipment unit incorporates various devices such as AC power supply, DC power supply, RLC load, grid impedance simulation device, and circuit breaker group, enabling it to simulate various complex test scenarios and meet the testing needs of different types of grid-type converters. The data acquisition unit uses a power analyzer and oscilloscope recorder to collect key data in real time during the testing process, ensuring the accuracy and completeness of the data. The data processing unit automatically processes and analyzes the collected data and generates detailed test reports. The entire process is automatically controlled by a computer, reducing manual intervention, effectively avoiding misjudgments and omissions, and greatly improving testing efficiency and accuracy. It fully meets the type test requirements of relevant technical specifications.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: On the one hand, a grid-type converter testing system, the system comprising: a computer control unit, an integrated testing equipment unit, a data acquisition unit, and a data processing unit;

[0006] The computer control unit is connected to the integrated test equipment unit, the data acquisition unit, and the data processing unit respectively, and controls the entire test process in a unified manner.

[0007] The integrated test equipment unit includes an AC power supply, a DC power supply, an RLC load, a grid impedance simulation device, and a circuit breaker group, which are used to construct various test scenarios;

[0008] The data acquisition unit includes a power analyzer and an oscilloscope recorder, used to acquire test data;

[0009] The data processing unit is used to process and analyze data and generate test reports.

[0010] Furthermore, the computer control unit can control the integrated test equipment unit to realize fully automatic testing of grid-type converters for grid-type fault ride-through, primary frequency regulation, inertia response, phase angle change, wideband oscillation characteristics, and damping characteristics. It can also control the integrated test equipment unit to realize semi-automatic testing of grid-type converters for black start, islanding protection, and other electrical performance tests.

[0011] Furthermore, the DC power supply in the integrated test equipment unit includes a photovoltaic simulator and a battery simulator. The photovoltaic simulator can simulate the IV characteristics of photovoltaic modules, and the battery simulator can simulate the characteristics of lead-acid batteries and lithium batteries, adapting to the testing of different types of grid-connected converters.

[0012] On the other hand, a method for using a grid-type converter testing system, the method comprising:

[0013] Equipment Connection: Connect the grid-type converter to be tested to the integrated test equipment unit;

[0014] Circuit construction: The computer control unit selects the test items and controls the circuit breaker group to form a specific test circuit according to the different test items;

[0015] Parameter configuration: The parameters of the AC power supply, DC power supply, RLC load, and mains impedance simulation device can be set through the computer control unit;

[0016] Data Acquisition: Upon starting the test, the data acquisition unit collects relevant data in real time during the test process and transmits the data to the data processing unit;

[0017] Data Processing and Report Generation: The data processing unit processes and analyzes the data to determine whether the test has been completed at all test points. If completed, a test report is generated; if not, data collection continues until completion.

[0018] Furthermore, in the equipment connection step, when connecting the grid-type inverter to be tested to the integrated test equipment unit, the grid-type photovoltaic-energy storage integrated machine is connected to two DC inputs and AC outputs, the grid-type photovoltaic inverter is connected to one DC input and AC output, and the grid-type energy storage inverter is connected to one DC input and AC output.

[0019] Furthermore, in the parameter configuration step:

[0020] For AC power supplies, set the voltage, frequency, and phase according to the test requirements;

[0021] For DC power supplies: For grid-type photovoltaic-storage integrated machines, set the voltage of the two DC power supplies, one in CV mode and the other in IV mode; for grid-type photovoltaic inverters, set the voltage of the photovoltaic simulator in IV mode; for grid-type energy storage converters, set the voltage of the battery simulator in CV mode.

[0022] For RLC loads: Set the power of the RLC load according to the requirements of the test project;

[0023] For the power grid impedance simulation device: If the test project involves a weak power grid mode, start the power grid impedance simulation device and set the SCR value. In tests that do not involve a weak power grid mode, do not start the power grid impedance simulation device.

[0024] Furthermore, in the data acquisition step, the data acquisition unit acquires power, voltage, current, frequency, and phase data in real time during the test process according to a preset acquisition frequency.

[0025] Furthermore, in the data processing and report generation steps, the test report includes test items, test parameters, collected data, and processing result information.

[0026] On the other hand, a method for using a grid-type converter testing system, the method comprising:

[0027] Compared with existing technologies, this grid-type converter testing system and its usage method have the following advantages:

[0028] I. This invention effectively avoids errors caused by manual intervention through automated control and automatic data processing and analysis, thus strongly ensuring the accuracy of test results. During the test, the computer control unit precisely controls the closing and opening of the circuit breaker group and automatically constructs a dedicated test circuit according to the selected test items, reducing operational errors that may occur when manually switching equipment. At the same time, the data acquisition unit collects key data such as power and voltage in real time and accurately during the test process, and transmits them synchronously to the data processing unit. The data processing unit automatically processes and analyzes the collected data, accurately determines whether all measurement points have been collected, and automatically generates a test report containing detailed test items, parameters, and data results.

[0029] Second, this invention integrates multiple test devices into a single system through integrated design, avoiding frequent changes in test platforms and disconnection of cables, thus reducing operation time. At the same time, automated control runs through the entire testing process, from loop construction to report generation, all of which are completed by computer, reducing manual intervention, effectively avoiding misjudgments and omissions, and significantly improving testing efficiency and accuracy.

[0030] Other advantages, objectives and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination or study, or may be learned from the practice of the invention. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0032] Figure 1 A schematic diagram of a grid-type converter test system;

[0033] Figure 2 This is a test flowchart for Example 1;

[0034] Figure 3 This is a flowchart of the test process for Example 2;

[0035] Figure 4 This is a test flowchart for Example 3;

[0036] Figure 5 This is a test flowchart for Example 4;

[0037] Figure 6 This is a flowchart of the test process during the ordinary test in Example 5;

[0038] Figure 7 This is a test flowchart for the weak grid mode test in Example 5;

[0039] Figure 8 This is a test flowchart for Example 6;

[0040] Figure 9 This is a test flowchart for Example 7;

[0041] Figure 10 This is a test flowchart for Example 8;

[0042] Figure 11 This is a flowchart of the test process during the ordinary test in Example 9;

[0043] Figure 12 This is a test flowchart for the weak grid mode test in Example 9;

[0044] Figure 13 This is a flowchart of the test process during the ordinary test in Example 10;

[0045] Figure 14 This is a test flowchart for the weak grid mode test in Example 10;

[0046] Figure 15 This is a flowchart of the test process during the ordinary test in Example 11;

[0047] Figure 16 This is a test flowchart for the weak grid mode test in Example 11;

[0048] Figure 17 This is a flowchart of the test process during the ordinary test in Example 12;

[0049] Figure 18 This is a test flowchart for the weak grid mode test in Example 12. Detailed Implementation

[0050] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0051] This invention provides a network converter testing system and its usage method, such as... Figure 1 As shown, the integrated test equipment unit, data acquisition unit, and data processing unit are organically integrated through the computer control unit to form a complete test system. The integrated test equipment unit integrates various devices such as AC power supply, DC power supply, RLC load, grid impedance simulation device, and circuit breaker group, which can simulate various complex test scenarios and meet the test requirements of different types of grid-type converters. The data acquisition unit uses a power analyzer and oscilloscope recorder to collect key data in real time during the test process to ensure the accuracy and integrity of the data. The data processing unit automatically processes and analyzes the collected data and generates detailed test reports.

[0052] Example 1

[0053] This embodiment is used to test the efficiency of photovoltaic power generation to the grid side and the efficiency of energy storage discharge to the grid side when the grid-connected converter is running.

[0054] Before testing, connect the AC output terminal of the grid converter to the AC power supply and grid impedance simulation device in the integrated test equipment unit, and connect the DC input terminal to the photovoltaic simulator and battery simulator to ensure good contact at each connection point.

[0055] During testing, such as Figure 2 As shown, the computer control unit controls the circuit breakers CB1, CB4, and CB5 to close, and CB2 and CB3 to open, forming a corresponding test circuit. Then, the AC power supply voltage is set to 380V and the frequency to 50Hz. The photovoltaic simulator is set to IV mode and the corresponding voltage parameters are set. The battery simulator is set to CV mode and the appropriate voltage is set. After the equipment is running stably, the power analyzer and oscilloscope recorder begin to collect data such as the power and voltage on the AC side of the converter and the input power on the DC side. The collection time lasts for 3 minutes. The data processing unit analyzes the collected data and calculates the efficiency of photovoltaic power generation to the grid side (i.e., the ratio of power obtained by the grid side to the output power of the photovoltaic simulator) and the efficiency of energy storage discharge to the grid side (i.e., the ratio of power obtained by the grid side to the output power of the battery simulator). Finally, a test report containing efficiency values, test parameters, and other information is generated.

[0056] Example 2

[0057] This embodiment aims to test the efficiency of energy storage charging from the grid when the grid-connected converter is in operation.

[0058] Before testing, connect the AC output terminal of the grid converter to the AC power supply and grid impedance simulation device in the integrated test equipment unit, and connect the DC input terminal to the photovoltaic simulator and battery simulator to ensure good contact at each connection point.

[0059] like Figure 3 As shown, the computer control unit controls CB1 and CB4 to close, and CB5, CB2, and CB3 to open, thus constructing the circuit corresponding to this test. Subsequently, the AC power supply voltage is set to 380V and the frequency to 50Hz, and the battery simulator is set to charging mode. After the test is started, the power grid charges the energy storage device through the converter. The data acquisition unit collects the power input from the power grid side and the power absorbed by the battery simulator in real time. The data processing unit calculates the efficiency of the energy storage charging from the power grid based on the collected data, that is, the ratio of the power absorbed by the battery simulator to the power input from the power grid side, and generates a test report.

[0060] Example 3

[0061] This embodiment is used to test the efficiency of photovoltaic power generation for energy storage in off-grid operation of a grid-connected converter.

[0062] Before testing, connect the grid-connected converter to the photovoltaic simulator, battery simulator, and RLC load to ensure that the energy transmission path is unobstructed during off-grid operation.

[0063] During testing, such as Figure 4 As shown, the computer control unit controls CB5 and CB4 to close, and CB1, CB2, and CB3 to open, forming an off-grid test circuit. The photovoltaic simulator is set to IV mode to simulate the output characteristics under different light intensities. The battery simulator is set to charging mode. After the test is started, the photovoltaic simulator charges the battery simulator through the converter. The data acquisition unit collects the output power of the photovoltaic simulator and the input power of the battery simulator. The data processing unit calculates the ratio of the two to obtain the efficiency of photovoltaic charging of energy storage and generates a corresponding test report.

[0064] Example 4

[0065] This embodiment is used to test the efficiency of energy storage in powering RLC loads when the grid-connected converter is operating off-grid.

[0066] During the test connection, connect the DC input terminal of the grid converter to the battery simulator and the AC output terminal to the RLC load.

[0067] like Figure 5 As shown, the computer control unit controls CB1 and CB4 to close, and CB5, CB2, and CB3 to open, thus constructing a test circuit for off-grid operation where the energy storage supplies power to the RLC load. The battery simulator is set to discharge mode, and the RLC load is set to a preset power value. After the test is started, the energy storage device supplies power to the RLC load through the converter. The data acquisition unit collects the output power of the battery simulator and the power consumed by the RLC load. The data processing unit calculates the efficiency of the energy storage supplying power to the load (i.e., the ratio of the power consumed by the RLC load to the output power of the battery simulator) and generates a test report.

[0068] Example 5

[0069] This embodiment includes power quality tests for grid-connected operation in normal mode and weak grid mode, used to test power quality indicators such as harmonics, DC components and three-phase imbalance of grid-connected converters during grid-connected operation.

[0070] During normal mode testing, such as Figure 6 As shown, the computer control unit controls CB1, CB5, and CB4 to close, and CB2 and CB3 to open; during the weak grid mode test, as... Figure 7 As shown, control CB1, CB3, CB5, and CB4 to close, and CB2 to open.

[0071] During the test, parameters such as voltage and frequency of the AC power supply are set. In normal mode, the grid impedance simulation device is not put into operation. In weak grid mode, the SCR value of the grid impedance simulation device is set to 1.5. The data acquisition unit collects the voltage and current signals on the AC output side of the converter. The power analyzer analyzes the harmonic content (total harmonic distortion rate and each harmonic component), the magnitude of the DC component, and the imbalance of the three-phase voltage and current. The data processing unit evaluates these indicators to determine whether they meet the relevant standards and generates a test report containing various power quality indicators.

[0072] Example 6

[0073] This embodiment is used to test the performance of a grid-connected converter during off-grid operation, including voltage deviation, frequency deviation, voltage harmonics, and dynamic voltage transients.

[0074] During connection testing, connect the grid-connected converter to the RLC load and battery simulator to ensure that the power supply circuit is normal during off-grid operation.

[0075] like Figure 8 As shown, the computer control unit controls CB2, CB5, and CB4 to close, and CB1 and CB3 to open, forming an off-grid operation test circuit. The battery simulator is set to discharge mode, and the RLC load is set with different power values ​​according to test requirements. During the test, the data acquisition unit continuously collects the voltage and frequency output of the converter, analyzes the voltage deviation (the percentage of the difference between the actual voltage and the rated voltage to the rated voltage) and frequency deviation (the difference between the actual frequency and the rated frequency); at the same time, it collects voltage signals to analyze the voltage harmonic content; by changing the power of the RLC load, it simulates load sudden changes, observes dynamic voltage transients, and records the voltage fluctuation amplitude and recovery time. The data processing unit organizes and analyzes the collected data, generates a test report, and evaluates the various performance indicators of the converter during off-grid operation.

[0076] Example 7

[0077] This embodiment is used to test the operation and protection performance of a grid-type converter in islanded mode.

[0078] Before testing, connect the AC side of the grid-connected converter to the power grid and RLC load, and the DC side to the photovoltaic simulator and battery simulator, ensuring that all interfaces are connected correctly.

[0079] During testing, such as Figure 9 As shown, the computer control unit controls CB1, CB2, CB5, and CB4 to close, and CB3 to open, constructing an islanding test circuit. First, the converter is controlled to operate in grid-connected mode. The photovoltaic simulator is set to IV mode and the battery simulator to CV mode. The RLC load is adjusted to the preset power. After the system stabilizes, the grid-side connection is disconnected (simulating islanding). The oscilloscope recorder synchronously records the converter output voltage, frequency, and protection action signals. The data processing unit analyzes whether the converter triggers islanding protection and shuts down within the specified time, evaluates its islanding detection accuracy and response speed, and finally generates a test report containing protection action time and voltage / frequency change curves.

[0080] Example 8

[0081] This embodiment is used to verify the black start capability of a grid-connected converter, that is, its autonomous start-up and load-carrying performance without external grid support.

[0082] During the test connection, the DC side of the converter is connected to a battery simulator, and the AC side is connected to an RLC load. The external power grid is not connected.

[0083] like Figure 10 As shown, the computer control unit controls CB2, CB5, and CB4 to close, while CB1 and CB3 are disconnected, forming a black start test circuit. The battery simulator is set to discharge mode, and the RLC load is lightly loaded (approximately 30% of rated power). After the black start program is started, the converter obtains energy from the battery simulator and gradually establishes a stable AC output voltage and frequency. The data acquisition unit records the voltage establishment time, frequency stabilization time, and overshoot during the start-up process. After the output stabilizes, the load is gradually increased to the rated value, and the voltage and frequency fluctuations are observed. The data processing unit evaluates the black start success rate and load capacity and generates a test report.

[0084] Example 9

[0085] This embodiment includes normal mode and weak grid mode, testing the uninterrupted operation capability of the grid-type converter when the grid experiences voltage dips / sudden rises.

[0086] During normal mode testing, such as Figure 11 As shown, the computer control unit controls CB1, CB5, and CB4 to close, and CB2 and CB3 to open; in weak grid mode, as... Figure 12As shown, control CB1, CB3, CB5, and CB4 to close, and CB2 to open.

[0087] The converter output power is set to 70% of rated power (heavy load) and 30% of rated power (light load). The AC power supply simulates grid faults: voltage drops to 90%, 80%, 60%, 40%, 20%, 0% (low breakdown) and surges to 110%, 120%, 130% (high breakdown). The fault state is maintained for 150ms. The data acquisition unit records the converter output current, voltage and whether it is disconnected from the grid during the fault period. The data processing unit analyzes its ride-through capability under different fault conditions and determines whether it meets the standard requirements.

[0088] Example 10

[0089] This embodiment is used to test the dynamic response and stable operation capability of a grid-type converter when the grid voltage phase angle changes suddenly.

[0090] In normal mode, such as Figure 13 As shown, control CB1, CB5, and CB4 to close, and CB2 and CB3 to open; in weak grid mode, as... Figure 14 As shown, control CB1, CB3, CB5, and CB4 to close, and CB2 to open.

[0091] The converter is set to operate in grid-connected mode, and the AC power supply simulates grid phase angle changes: the three-phase voltage phase angles change abruptly by 15°, 30°, 45°, and 60° respectively, lasting for 30 seconds. The data acquisition unit records the converter output power and current waveforms at the moment of phase angle change and after stabilization. The data processing unit analyzes the active / reactive power fluctuation amplitude, recovery time, and whether instability occurs, and evaluates the converter's tolerance to phase angle changes.

[0092] Example 11

[0093] This embodiment evaluates the interaction stability between the grid-connected converter and the power grid by measuring the wideband impedance of the grid-connected converter, including normal mode and weak grid mode.

[0094] During normal mode testing, such as Figure 15 As shown, control CB1, CB5, and CB4 to close, and CB2 and CB3 to open; in weak grid mode, as... Figure 16 As shown, control CB1, CB3, CB5, and CB4 to close, and CB2 to open.

[0095] A positive-sequence disturbance signal of 5% of the rated voltage is applied to the AC side of the converter, with a frequency range of 1Hz to 1000Hz (1Hz to 200Hz step size 1Hz, 201Hz to 400Hz step size 5Hz, 405Hz to 1000Hz step size 10Hz). The application time at each frequency point is 1s. The power analyzer collects the disturbance voltage and current, and the data processing unit calculates the impedance amplitude and phase at different frequencies to generate impedance characteristic curves, providing a basis for system stability analysis.

[0096] Example 12

[0097] This embodiment is used to test the damping capability of a grid-type converter against broadband grid oscillations, including normal mode and weak grid mode.

[0098] In normal mode, such as Figure 17 As shown, control CB1, CB5, and CB4 to close, and CB2 and CB3 to open; in weak grid mode, as... Figure 18 As shown, control CB1, CB3, CB5, and CB4 to close, and CB2 to open.

[0099] A sinusoidal voltage with a frequency of 50 + Asin(2 + Bt) is applied to the AC power supply (A has an amplitude of 0.01, 0.05, and 0.1, and B corresponds to an oscillation frequency of 0.2Hz to 2.5Hz) for 30 seconds. The data acquisition unit records the output current of the converter and the oscillation amplitude of the grid voltage. The data processing unit analyzes its suppression effect on oscillations of different frequencies and evaluates whether the damping characteristics meet the grid stability requirements.

[0100] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A test system for a grid-type converter, characterized in that, The system includes: a computer control unit, an integrated testing equipment unit, a data acquisition unit, and a data processing unit; The computer control unit is connected to the integrated test equipment unit, the data acquisition unit, and the data processing unit respectively, and controls the entire test process in a unified manner. The integrated test equipment unit includes an AC power supply, a DC power supply, an RLC load, a grid impedance simulation device, and a circuit breaker group, which are used to construct various test scenarios; The data acquisition unit includes a power analyzer and an oscilloscope recorder, used to acquire test data; The data processing unit is used to process and analyze data and generate test reports.

2. The grid-type converter testing system according to claim 1, characterized in that, The computer control unit can control the integrated test equipment unit to achieve fully automatic testing of grid-type converters for grid-type fault ride-through, primary frequency regulation, inertia response, phase angle change, wideband oscillation characteristics, and damping characteristics. It can also control the integrated test equipment unit to achieve semi-automatic testing of grid-type converters for black start, islanding protection, and other electrical performance tests.

3. The grid-type converter testing system according to claim 1, characterized in that, The integrated test equipment unit includes a photovoltaic simulator and a battery simulator. The photovoltaic simulator can simulate the IV characteristics of photovoltaic modules, and the battery simulator can simulate the characteristics of lead-acid batteries and lithium batteries, adapting to the testing of different types of grid-type converters.

4. The grid-type converter testing system according to claim 1, characterized in that, The integrated test equipment unit circuit breaker group can form test circuits for grid-connected and off-grid operation through different combinations of closing and opening.

5. A method for using a grid-type converter testing system, wherein the method employs the grid-type converter testing system described in any one of claims 1-3, characterized in that, The method includes: Equipment Connection: Connect the grid-type converter to be tested to the integrated test equipment unit; Circuit construction: The computer control unit selects the test items and controls the circuit breaker group to form a specific test circuit according to the different test items; Parameter configuration: The parameters of the AC power supply, DC power supply, RLC load, and mains impedance simulation device can be set through the computer control unit; Data Acquisition: Upon starting the test, the data acquisition unit collects relevant data in real time during the test process and transmits the data to the data processing unit; Data processing and report generation: The data processing unit processes and analyzes the data to determine whether the test has been completed for all test points; if completed, a test report is generated; if not completed, data collection continues until completion.

6. The method of using the grid-type converter testing system according to claim 5, characterized in that, In the equipment connection step, when connecting the grid-type converter to be tested to the integrated test equipment unit, the grid-type photovoltaic-storage integrated machine is connected to two DC inputs and AC outputs, the grid-type photovoltaic inverter is connected to one DC input and AC output, and the grid-type energy storage converter is connected to one DC input and AC output.

7. The method of using the grid-type converter testing system according to claim 5, characterized in that, In the parameter configuration steps: For AC power supplies, set the voltage, frequency, and phase according to the test requirements; For DC power supplies: For grid-type photovoltaic-storage integrated machines, set the voltage of the two DC power supplies, one in CV mode and the other in IV mode; for grid-type photovoltaic inverters, set the voltage of the photovoltaic simulator in IV mode; for grid-type energy storage converters, set the voltage of the battery simulator in CV mode. For RLC loads: Set the power of the RLC load according to the requirements of the test project; For the power grid impedance simulation device: If the test project involves a weak power grid mode, start the power grid impedance simulation device and set the SCR value. In tests that do not involve a weak power grid mode, do not start the power grid impedance simulation device.

8. The method of using the grid-type converter testing system according to claim 5, characterized in that, In the data acquisition step, the data acquisition unit acquires power, voltage, current, frequency, and phase data in real time during the test process according to a preset acquisition frequency.

9. The method of using the grid-type converter testing system according to claim 5, characterized in that, In the data processing and report generation steps, the test report includes test items, test parameters, collected data, and processing result information.

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