Converter valve saturable reactor iron core noise test method and computer device

Abstract

The invention relates to the field of reactor iron core noise testing, in particular to a converter valve saturable reactor iron core noise testing method and a computer device, and ensures the accuracy and consistency of noise testing data in a mode of combining a simulation sound wave interference rule and an actual fixed testing position. The method comprises the following steps: establishing a three-dimensional model of a converter valve saturable reactor iron core, and setting different reactor working conditions for simulation; according to a simulation result, selecting test points, selecting an area with sound wave intensity greater than a set value and a sound wave interference area as the test points, and selecting the test points away from interference; a test instrument is fixed at a selected test position for testing, and during testing, the test instrument keeps a set vertical distance from the noise source and is parallel to the axis of the iron core of the reactor; and analyzing and evaluating test data, and finally comparing and verifying a test result and a simulation result. The method is suitable for the reactor iron core noise test.

Description

Technical Field

[0001] The present invention relates to the field of reactor core noise testing, and in particular to a converter valve saturated reactor core noise testing method and a computer device. Background Art

[0002] The converter valve saturated reactor plays a key role in the high voltage direct current transmission system. The noise generated by the core vibration during its operation may affect the long-term stability of the equipment and the noise level of the surrounding environment.

[0003] In the prior art, there is a lack of unified test point selection specifications for the test of core noise, resulting in greater uncertainty in the test results. In particular, the random arrangement of the measuring points may avoid the constructive interference area of ​​the sound wave, resulting in the measured noise decibel value being lower than the actual level, thereby affecting the accuracy of the noise assessment. For example, CN117760540A proposes a scheme to select 6 measuring points and require that these measuring points be evenly distributed on the cross-section 0.3 meters away from the outer surface of the anode saturated reactor core. However, this scheme does not clearly specify the specific location of the given measuring points, so if these measuring points happen to be distributed in the destructive interference area of ​​the sound wave, the measured noise value will not be able to truly reflect the actual noise level of the anode saturated reactor. The interference effect of sound waves, especially destructive interference, may cause the noise intensity in certain areas to be reduced, resulting in low measured values, and thus unable to fully evaluate the noise performance of the equipment. Therefore, the selection of measuring points needs to not only consider their uniform distribution, but also avoid the influence of the sound wave interference effect to ensure the accuracy and comprehensiveness of the noise assessment. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a method and a computer device for testing the core noise of a saturated reactor of a converter valve, which ensures the accuracy and consistency of the noise test data by combining the simulated sound wave interference law with the actual fixed test position, thereby accurately evaluating the core noise characteristics.

[0005] The present invention adopts the following technical solutions to achieve the above-mentioned purpose. In a first aspect, the present invention provides a method for testing the core noise of a saturated reactor of a converter valve, comprising: S1. Establish a three-dimensional model of the converter valve saturated reactor core and set different reactor working conditions for simulation; S2. Select test points according to simulation results; S3. Arrange test equipment for testing; S4. Analyze and evaluate the test data; S5. Compare and verify the test results with the simulation results.

[0006] Furthermore, step S1 specifically includes: A three-dimensional model of the converter valve saturated reactor core is established. Based on the electromagnetic and acoustic field coupling simulation method, the model is used to simulate the vibration generated by the reactor core when it is subjected to electromagnetic force, and the propagation characteristics of the sound waves generated by the vibration are analyzed. During the simulation process, different working conditions of the reactor are set to simulate the frequency and amplitude of the core vibration, calculate the propagation path, intensity distribution and wavelength of the sound wave at different frequencies, and identify the interference area and intensity distribution peak area of ​​the sound wave by analyzing the sound wave interference at different positions. Finally, a sound field contour map or a three-dimensional sound field distribution map is generated.

[0007] Furthermore, step S2 specifically includes: According to the simulation results, based on the actual structure of the reactor and its operating status, the acoustic interference area is selected as the test point. The test point needs to be selected away from interference, including electromagnetic interference, temperature change interference and wind speed interference.

[0008] Furthermore, step S3 specifically includes: Fix the test instrument at the selected test position for testing. During the test, the test instrument maintains a set vertical distance from the noise source and is parallel to the axis of the reactor core. During the test, the working mode of the measuring instrument is first set according to the operating conditions of the reactor, noise is collected in multiple time periods under different reactor operating conditions, and changes in temperature, humidity and wind speed are recorded. The changes in temperature, humidity and wind speed are used to correct and compare the test data. When collecting noise, test points are selected for data collection, and multiple groups of measurement data are collected at each test point.

[0009] Furthermore, step S4 specifically includes: Process the collected noise data, remove outliers and noise interference, calculate the average noise level of each test point, and use variance analysis or regression analysis to evaluate the accuracy and reliability of the processed data; Based on the actual test data, the spectrum distribution of the reactor core noise intensity, the direction of noise propagation and its impact on the environment are analyzed. Combined with the environmental noise standards, it is evaluated whether the noise of the converter valve saturated reactor meets the requirements.

[0010] In a second aspect, the present invention provides a computer device, including a memory, wherein the memory stores program instructions, and when the program instructions are executed, the converter valve saturated reactor core noise test method as described above is executed.

[0011] The beneficial effects of the present invention are: The present invention combines simulation analysis with actual testing, can accurately identify the noise peak area generated by core vibration, ensure that the noise test data reflects the actual situation, and avoid the deviation caused by the randomness of the measuring points in the traditional method.

[0012] The method of the present invention greatly reduces noise measurement errors by optimizing the selection of measurement points and the arrangement of equipment, and improves the repeatability of the test process and the reliability of data. The fixed equipment and multi-point redundant design adopted make the measurement results more scientific.

[0013] The present invention combines simulation analysis with actual testing to more comprehensively analyze the characteristics of core noise and provide a scientific basis for optimizing reactor design and noise reduction measures. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a flow chart of a method for testing the core noise of a saturated reactor of a converter valve provided by an embodiment of the present invention; Figure 2 It is a schematic diagram of a three-dimensional simulation model of a converter valve saturated reactor core provided by an embodiment of the present invention; Figure 3 is a simulation result of the sound pressure level of the longitudinal section of the core of the converter valve saturated reactor provided in an embodiment of the present invention; Figure 4 It is a simulation result of the sound pressure level contour line of the longitudinal section of the core of the saturated reactor of the converter valve provided in the embodiment of the present invention. DETAILED DESCRIPTION

[0015] To make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0016] The present invention provides a method for testing the core noise of a saturated reactor of a converter valve. Figure 1 As shown, specifically including: S1. Establish a three-dimensional model of the converter valve saturated reactor core and set different reactor working conditions for simulation; S101, simulation model construction; First, commercial simulation software (such as ANSYS, COMSOL, etc.) is used to establish a three-dimensional model of the converter valve saturated reactor core. Figure 2 As shown. Considering the geometric shape, material properties and acoustic characteristics of the reactor's surrounding environment (such as air, steel structure, etc.), the electromagnetic-acoustic field coupling simulation method is used to simulate the vibration of the reactor core under high current, and further analyze the propagation characteristics of the sound waves generated by these vibrations.

[0017] S102, simulation analysis; During the simulation process, the frequency and amplitude of the core vibration are simulated by setting different reactor operating conditions (such as full load, partial load, no load, etc.). The simulation software calculates the propagation path, wavelength and intensity distribution of the sound wave according to the set boundary conditions and material parameters. Through the visual analysis of the sound wave propagation, the sound wave interference area and the peak area of ​​the intensity distribution are identified to determine the best measurement point.

[0018] S103, result output and sound field map generation; The simulation software generates a three-dimensional sound field distribution map or contour map, which shows the sound wave intensity at various locations around the reactor. In the map, the peak area of ​​the sound intensity is the potential noise source area, which is usually the focus of the test. Figure 3 , Figure 4 As shown, there are respectively the simulation results of the sound pressure level of the longitudinal section of the core of the saturated reactor of the converter valve and the simulation results of the contour lines of the sound pressure level of the longitudinal section of the core of the saturated reactor of the converter valve.

[0019] S2. Select test points according to simulation results; According to the simulation results, areas with higher sound wave intensity are selected as test points. The criteria for selecting test points not only consider the intensity of the sound waves, but also the actual structure of the reactor and its operating status, and avoid selecting areas that are blocked or affected by the equipment structure. At the same time, considering the propagation characteristics of sound waves in space, the sound wave interference area is selected as the key test point to ensure the representativeness and accuracy of the test results.

[0020] In the process of selecting the test point, possible external interference is taken into account, such as electromagnetic interference, temperature change, wind speed, etc. According to the working environment of the reactor, the test point should be far away from these potential interference sources to avoid unnecessary influence on the noise test data.

[0021] When selecting the test point, avoid interference sources around the reactor, such as cables, pipelines, strong electromagnetic field sources, etc. Especially in the area close to the reactor, ensure that the test point is as far away as possible from the electromagnetic interference of electrical equipment to avoid affecting the test results.

[0022] In the peak area selected by the simulation, multiple test points can be selected for data collection. These test points should cover different angles around the reactor core as much as possible to ensure that the spatial distribution characteristics of the core noise can be fully captured.

[0023] S3. Arrange test equipment for testing; S301, select a test instrument; During the test, a high-precision sound level meter (such as Brüel&Kjær, RION, etc.) is used as a measuring instrument to accurately measure the frequency and intensity of the sound. To ensure the accuracy of the test, optional equipment such as windshields and data recorders can also be used to reduce the interference of external noise on the test results.

[0024] S302, test instrument installation; Use a tripod or other fixture at the test point to fix the sound level meter at a suitable height and angle. Usually, the sound level meter should be parallel to the axis of the reactor core to ensure that the noise caused by the core vibration can be directly captured. According to the simulation results, select the appropriate distance between the sound level meter and the noise source to avoid measurement errors caused by being too close or too far.

[0025] S303, test instrument debugging and configuration; After installation, the sound level meter needs to be debugged to ensure that it is in normal working condition. Configure test parameters such as sampling frequency, measurement time length, noise measurement unit (for example, decibel dB), etc. Set the corresponding measurement mode for different reactor working conditions (such as full load, partial load, etc.).

[0026] S304, noise data collection; After the reactor is put into operation and stabilized, noise data collection begins. Noise measurements are performed continuously or intermittently according to the actual working conditions of the reactor. Usually, multiple tests are performed at each test point to collect data in different time periods. This can reduce the impact of instantaneous environmental changes on the data and ensure that the data is representative.

[0027] In order to ensure the accuracy and reliability of the test results, the noise data of each test point should be collected repeatedly. Through multiple measurements, the average value of the noise of each test point can be calculated to obtain a more stable test result.

[0028] When conducting noise testing, it is also necessary to record environmental conditions (such as temperature, humidity, wind speed, etc.) so that the test data can be reasonably corrected and compared and analyzed. If the test environment changes, the impact of environmental factors on the noise level can be eliminated through data correction.

[0029] S4. Analyze and evaluate the test data; The collected noise data is processed to remove outliers and noise interference, and the average noise level of each measuring point is calculated. Statistical analysis methods, such as variance analysis and regression analysis, are used to evaluate the accuracy and reliability of the test data. At the same time, the effectiveness of the test method is evaluated by combining the simulation analysis results with the test data.

[0030] According to the actual test results, the characteristics of the core noise are analyzed, such as the spectrum distribution of the noise intensity, the direction of noise propagation and its impact on the environment. Combined with the environmental noise standards, the noise of the converter valve saturated reactor is evaluated to see whether it meets the requirements, providing data support for the subsequent improvement and optimization of the reactor.

[0031] According to the noise test results and analysis, targeted noise reduction measures are proposed, such as improving the reactor design, strengthening the core structure, adding sound insulation devices, etc., to further reduce the impact of noise on the surrounding environment.

[0032] S5. Compare and verify the test results with the simulation results.

[0033] Finally, the test data is compared with the simulation results to verify the accuracy of the simulation model and the reliability of the test method. If the test results are consistent with the simulation results, it means that this test method is effective. If there is a difference, it is necessary to further adjust the simulation parameters or test methods to optimize the test plan.

[0034] During the implementation of the present invention, the traditional random point selection method and the method of the present invention are used for comparative testing. The noise test of the two methods is performed on the same reactor, and the difference in the results is compared. In the traditional method, the randomly selected measuring points avoid the acoustic wave interference area, resulting in generally low measured noise values ​​and large fluctuations. The measuring points selected by the method of the present invention are located in the acoustic wave interference peak area, and the measured noise values ​​are relatively stable and consistent with the actual noise level.

[0035] By comparing the noise data of the two methods through statistical analysis, it is found that the test results of the method of the present invention are about 5% to 10% lower than the error of the traditional method. At the same time, the fluctuation range of the noise data is smaller and has higher stability.

[0036] In summary, the converter valve saturated reactor core noise test method provided by the present invention can solve the problems of irregular measurement point selection and unstable data in traditional noise testing. By combining simulation analysis with actual testing, the characteristics of core noise can be accurately evaluated, providing a scientific basis for the design optimization and noise reduction scheme of the reactor.

[0037] The above is only a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art shall not deviate from the spirit and scope of the present invention, and shall be within the scope of protection of the claims attached to the present invention.

Claims

1. A method for testing the core noise of a converter valve saturated reactor, characterized in that: include: S1. Establish a three-dimensional model of the converter valve saturated reactor core and set different reactor working conditions for simulation; S2. Select test points according to simulation results; S3. Arrange test equipment for testing; S4. Analyze and evaluate the test data; S5. Compare and verify the test results with the simulation results.

2. The method for testing the core noise of a converter valve saturated reactor according to claim 1, characterized in that: Step S1 specifically includes: A three-dimensional model of the converter valve saturated reactor core is established. Based on the electromagnetic and acoustic field coupling simulation method, the model is used to simulate the vibration generated by the reactor core when it is subjected to electromagnetic force, and the propagation characteristics of the sound waves generated by the vibration are analyzed. During the simulation process, different working conditions of the reactor are set to simulate the frequency and amplitude of the core vibration, calculate the propagation path, intensity distribution and wavelength of the sound wave at different frequencies, and identify the interference area and intensity distribution peak area of ​​the sound wave by analyzing the sound wave interference at different positions. Finally, a sound field contour map or a three-dimensional sound field distribution map is generated.

3. The method for testing the core noise of a converter valve saturated reactor according to claim 2, characterized in that: Step S2 specifically includes: According to the simulation results, based on the actual structure of the reactor and its operating status, the acoustic interference area is selected as the test point. The test point needs to be selected away from interference, including electromagnetic interference, temperature change interference and wind speed interference.

4. The method for testing the core noise of a converter valve saturated reactor according to claim 3, characterized in that: Step S3 specifically includes: Fix the test instrument at the selected test position for testing. During the test, the test instrument maintains a set vertical distance from the noise source and is parallel to the axis of the reactor core. During the test, the working mode of the measuring instrument is first set according to the operating conditions of the reactor, noise is collected in multiple time periods under different reactor operating conditions, and changes in temperature, humidity and wind speed are recorded. The changes in temperature, humidity and wind speed are used to correct and compare the test data. When collecting noise, test points are selected for data collection, and multiple groups of measurement data are collected at each test point.

5. The method for testing the core noise of a converter valve saturated reactor according to claim 4, characterized in that: Step S4 specifically includes: Process the collected noise data, remove outliers and noise interference, calculate the average noise level of each test point, and use variance analysis or regression analysis to evaluate the accuracy and reliability of the processed data; Based on the actual test data, the spectrum distribution of the reactor core noise intensity, the direction of noise propagation and its impact on the environment are analyzed. Combined with the environmental noise standards, it is evaluated whether the noise of the converter valve saturated reactor meets the requirements.

6. A computer device comprising a memory, wherein the memory stores program instructions, characterized in that: When the program instructions are executed, the converter valve saturated reactor core noise testing method according to any one of claims 1 to 5 is executed.

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