Method and system for testing and correcting noise of wind generating set in strong wind environment

Abstract

The invention discloses a wind generating set noise test correction method and system in a strong wind environment, and the method comprises the steps: installing a windproof ball at the front end of an acoustic sensor in a wind generating set noise test, installing a windproof cover on the basis of the windproof ball, and carrying out the calibration measurement calculation of the windproof cover in advance, the insertion loss value of the windshield is obtained, the insertion loss value of the windshield is used for compensating the measurement result of the field noise test of the wind generating set, then the real noise characteristic result of the wind generating set is obtained, and correction of the noise test is completed; according to the invention, the problem that the noise measurement of the wind turbine generator cannot be realized or the accuracy of the measurement result is low in the noise test in a strong wind environment can be solved, the influence of environmental wind noise on the test result is effectively reduced, and the accuracy of noise data acquisition of the tested sound source is improved. Meanwhile, it is guaranteed that the operation mode is simple and convenient, design materials are simple and convenient, and economical efficiency is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of wind turbine generator set noise testing, and in particular to a wind turbine generator set noise testing and correction method and system under a strong wind environment. Background Art

[0002] As wind turbines have become larger in capacity and their blades have become longer, the noise generated by wind turbines has also increased. Wind turbine noise consists of electromagnetic noise, mechanical noise, and aerodynamic noise. Noise pollution is one of the main environmental problems caused by wind turbines. The low-frequency characteristics of wind turbine noise can easily cause annoyance and insomnia, and may even cause continuous stimulation to the vestibular system of the human ear, increasing health risks.

[0003] Noise testing is an important means of evaluating the propagation and impact of wind turbine noise. Through testing, the noise characteristics of wind turbines can be clarified, the factors that cause noise and the degree of influence can be discovered in a timely manner, etc., so as to facilitate targeted solutions and improvement measures, reduce noise pollution to the environment, and create a good living environment. Unlike other noise test environments, wind turbines are often accompanied by strong winds, and their noise generation is often synchronized with wind noise. The main component of wind turbine noise is aerodynamic noise. During noise testing, it is inevitable to collect environmental wind noise synchronously. The aerodynamic noise and environmental wind noise of wind turbines cannot be effectively distinguished and eliminated during data processing, resulting in a large deviation between the noise measurement results and the actual situation, and the true noise characteristics of wind turbines cannot be effectively obtained.

[0004] At present, in outdoor noise testing, a windproof ball is installed at the front end of the acoustic sensor to reduce the air velocity near the microphone diaphragm, break up the airflow and reduce the generation of turbulence, which is equivalent to an acoustic low-pass filter. At the same time, the effective wind speed range is specified, generally the wind speed shall not exceed 5m / s, such as "GB12348-2008 Industrial Enterprise Boundary Environmental Noise Emission Standard". The operating wind speed of a wind turbine is generally 4m / s-20m / s. Obviously, the method of installing a windproof ball cannot meet the noise measurement of a wind turbine.

[0005] In wind farm noise measurement, the ambient wind noise is mainly corrected in the data results. For example, the measurement data correction method is given in "DLT1084-2021 Wind Farm Noise Limits and Measurement Methods", that is, when the background noise and the measured noise value differ by more than 10dB, the measured value is not corrected; when the difference is 3 to 10dB, a correction value of -1 to -3dB is given, and when the difference is less than 3dB, the background noise needs to be reduced and re-measured. This method only corrects from the perspective of sound pressure level and gives an evaluation value of the sound pressure level of the wind turbine. There is no correction of the spectral details of the background noise. The result cannot describe the true noise characteristics of the wind turbine. In addition, field experience shows that when the wind speed is high, the sound pressure level values ​​of wind noise and wind turbine noise are mostly different by about 3dB. In this case, the sound pressure level of the wind turbine cannot be evaluated. Summary of the invention

[0006] The purpose of the present invention is to overcome the shortcomings of the prior art and propose a method and system for correcting the noise test of a wind turbine generator set in a strong wind environment, which can solve the problem that the noise test in a strong wind environment cannot realize the noise measurement of the wind turbine generator set or the measurement result has low accuracy, effectively reduce the influence of environmental wind noise on the test results, and improve the accuracy of noise data collection of the measured sound source.

[0007] The objective of the present invention is achieved through the following technical scheme: a method for correcting the noise test of a wind turbine generator set in a strong wind environment, wherein a windproof ball is installed at the front end of an acoustic sensor during the noise test of the wind turbine generator set, and then a windshield is installed on the basis of the windproof ball. The windshield is pre-calibrated, measured and calculated to obtain an insertion loss value of the windshield, and the insertion loss value of the windshield is used to compensate for the measurement result of the on-site wind turbine generator set noise test, thereby obtaining the true noise characteristic result of the wind turbine generator set and completing the correction of the noise test.

[0008] Further, the method comprises the following steps:

[0009] S1. Two noise testing devices are provided, namely, a first noise testing device and a second noise testing device, wherein the first noise testing device comprises a measuring plate, an acoustic sensor and a windproof ball, and the second noise testing device comprises a measuring plate, an acoustic sensor, a windproof ball and a windproof cover;

[0010] S2. Set up a loudspeaker at a height of H in the acoustic laboratory, and the sound source of the loudspeaker is pink noise;

[0011] S3, set the first noise test device at the test points to perform multiple noise tests, the test points include the horizontal distance H from the speaker, the horizontal distance 1.2H from the speaker, and the horizontal distance 1.5H from the speaker, and average the measurement results of all the test points of the first noise test device, which is recorded as Lw c1;

[0012] S4, set the second noise test device at the test points to perform multiple noise tests, the test points include the horizontal distance H from the speaker, the horizontal distance 1.2H from the speaker, and the horizontal distance 1.5H from the speaker, and average the measurement results of all the test points of the second noise test device, recorded as Lw c2 ;

[0013] S5, the average value Lw obtained according to step S3 c1 and the average value Lw obtained in step S4 c2 , calculate the insertion loss value of the windshield △ = Lw c1 -Lw c2 ;

[0014] S6. In the outdoor environmental noise test of the wind turbine generator set, a second noise test device is installed to measure the sound pressure level of the wind turbine generator set operating noise at different wind speeds, recorded as L V ; and measure the sound pressure level of the ambient background noise when the wind turbine is shut down, recorded as L V,bg ;

[0015] S7. Correct the windshield insertion loss and correct the noise sound pressure level value L when the wind turbine is running. V '=L V +△, and correct the background noise sound pressure level value L when the wind turbine is shut down V,bg '=L V,bg +△;

[0016] S8, according to the corrected noise sound pressure level value obtained in step S7, calculate the noise sound pressure level value of the wind turbine generator set The sound power level of a wind turbine is Wherein R1 is the horizontal distance between the second noise testing device and the wind turbine generator set.

[0017] Furthermore, the first noise testing device includes a measuring plate, an acoustic sensor and a windbreak ball, wherein the acoustic sensor is installed on the measuring plate, and the windbreak ball is installed at the front end of the acoustic sensor.

[0018] Furthermore, the second noise testing device includes a measuring plate, an acoustic sensor, a wind shield and a wind shield, the acoustic sensor is installed on the measuring plate, the wind shield is installed at the front end of the acoustic sensor, and the wind shield is installed and covers the outside of the wind shield.

[0019] Furthermore, the windshield is a semi-spherical wireframe structure, the surface of which is provided with a foam or textile layer with a plurality of uniform small holes, and the surface thickness of the windshield is 13-25 mm.

[0020] Furthermore, the diameter of the wind shield is not less than 3 times the diameter of the wind shield ball.

[0021] Further, the step S3 comprises:

[0022] The first noise test device is set at each test point to perform noise test. At least three tests are performed at each test point. The measurement parameter is the frequency doubling. The test points include the horizontal distance H from the speaker, the horizontal distance 1.2H from the speaker, and the horizontal distance 1.5H from the speaker. The measurement results of all test points of the first noise test device are averaged and recorded as Lw c1 .

[0023] Further, the step S4 comprises:

[0024] The second noise test device is set at each test point to perform noise test. Each test point is tested at least three times. The measurement parameter is the frequency doubling. The test points include the horizontal distance H from the speaker, the horizontal distance 1.2H from the speaker, and the horizontal distance 1.5H from the speaker. The measurement results of all test points of the second noise test device are averaged and recorded as Lw c2 .

[0025] A wind turbine generator noise test and correction system in a strong wind environment, used to implement the wind turbine generator noise test and correction method in a strong wind environment, comprising:

[0026] A first noise testing device, used as a basic noise testing device to measure noise, comprising a measuring plate, an acoustic sensor and a windproof ball, wherein the acoustic sensor is mounted on the measuring plate, and the windproof ball is mounted at the front end of the acoustic sensor;

[0027] A second noise testing device, wherein a windshield is arranged on the basic noise testing device to measure the noise, wherein the second noise testing device comprises a measuring plate, an acoustic sensor, a windshield ball and a windshield, wherein the acoustic sensor is mounted on the measuring plate, the windshield ball is mounted at the front end of the acoustic sensor, and the windshield is mounted and covers the outer side of the windshield ball;

[0028] A loudspeaker, used as a reference noise source;

[0029] The windshield insertion loss value calculation module calculates the difference between the measured noise values ​​of the reference noise source by the first noise test device and the second noise test device to obtain the windshield insertion loss value;

[0030] Wind power site noise test module, used to measure the sound pressure level of wind turbine operating noise at different wind speeds and the sound pressure level of ambient background noise when the wind turbine is shut down;

[0031] A noise sound pressure level correction module is used to correct the noise sound pressure level of the wind turbine generator set during operation and the background noise sound pressure level of the environment when the wind turbine generator set is shut down according to the wind shield insertion loss value;

[0032] A wind turbine generator set noise sound pressure level value calculation module calculates the wind turbine generator set noise sound pressure level value according to the corrected wind turbine generator set operating noise sound pressure level value and the ambient background noise sound pressure level value when the wind turbine generator set is shut down;

[0033] The wind turbine generator sound power level calculation module calculates the wind turbine generator sound power level according to the wind turbine generator noise sound pressure level value.

[0034] Further, the windshield insertion loss value calculation module includes:

[0035] The first noise test device is set at each test point to perform noise test. At least three tests are performed at each test point. The measurement parameter is the frequency doubling. The test points include the horizontal distance H from the speaker, the horizontal distance 1.2H from the speaker, and the horizontal distance 1.5H from the speaker. The measurement results of all test points of the first noise test device are averaged and recorded as Lw c1 ;

[0036] The second noise test device is set at each test point to perform noise test. Each test point is tested at least three times. The measurement parameter is the frequency doubling. The test points include the horizontal distance H from the speaker, the horizontal distance 1.2H from the speaker, and the horizontal distance 1.5H from the speaker. The measurement results of all test points of the second noise test device are averaged and recorded as Lw c2 ;

[0037] According to the average value Lw c1 and the average value Lw obtained in step S4 c2 , calculate the insertion loss value of the windshield △ = Lw c1 -Lw c2 .

[0039] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0040] The present invention can realize noise measurement in a wind environment with a wind speed exceeding 5m / s, avoid the problem of being unable to measure when the difference between wind noise and the noise measured by the sound source is less than 3dB, effectively reduce the test of wind noise on the noise characteristics of wind turbines, and improve measurement accuracy. At the same time, it ensures that the operation method is simple and convenient, and the design materials are simple, cost-saving, and economical. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 This is a top view of the structure of the first noise testing device.

[0042] Figure 2 This is a structural side view of the first noise testing device.

[0043] Figure 3 This is a top view of the structure of the second noise testing device.

[0044] Figure 4 It is a structural side view of the second noise testing device.

[0045] Figure 5 This is a schematic diagram of the arrangement of the first noise testing device and the loudspeaker.

[0046] Figure 6 This is a schematic diagram of the arrangement of the second noise testing device and the loudspeaker. DETAILED DESCRIPTION

[0047] The present invention will be further described below in conjunction with specific embodiments.

[0048] Example 1

[0049] The present embodiment provides a method for correcting the noise test of a wind turbine generator set in a strong wind environment. The method is to install a windproof ball at the front end of an acoustic sensor in the noise test of the wind turbine generator set, and then install a windshield on the basis of the windproof ball. The windshield is pre-calibrated, measured and calculated to obtain an insertion loss value of the windshield. The insertion loss value of the windshield is used to compensate the measurement result of the on-site wind turbine generator set noise test, thereby obtaining the real noise characteristic result of the wind turbine generator set, and completing the correction of the noise test. The method includes the following steps:

[0050] S1. Set up two sets of noise test equipment, see Figures 1 to 4 As shown, they are respectively a first noise test device 1 and a second noise test device 2, wherein the first noise test device 1 comprises a measuring plate 1-1, an acoustic sensor 1-2 and a windproof ball 1-3, wherein the acoustic sensor 1-2 is mounted on the measuring plate 1-1, and the windproof ball 1-3 is mounted at the front end of the acoustic sensor 1-2, and the windproof ball 1-3 is hemispherical;

[0051] The second noise testing device 2 comprises a measuring plate 2-1, an acoustic sensor 2-2, a windproof ball 2-3 and a windproof cover 2-4, wherein the acoustic sensor 2-2 is mounted on the measuring plate 2-1, the windproof ball 2-3 is mounted at the front end of the acoustic sensor 2-2, the windproof ball 2-3 is hemispherical, and the windproof cover 2-4 is mounted and covers the outer side of the windproof ball 2-3; the windproof cover 2-4 is a hemispherical wireframe structure, and a foam or textile layer with a plurality of uniform small holes is provided on its surface, the surface thickness of the windproof cover 2-4 is 13-25 mm, and the diameter of the windproof cover 2-4 is not less than 3 times the diameter of the windproof ball 2-3;

[0052] S2. Set up a loudspeaker at a height of H in the acoustic laboratory, and the sound source of the loudspeaker is pink noise;

[0053] S3, see Figure 5 As shown, the first noise test device 1 is set at each test point to perform noise test. At least three tests are performed at each test point. The measurement parameter is the frequency doubling. The test points include the one at a horizontal distance H from the speaker 3, the one at a horizontal distance 1.2H from the speaker 3, and the one at a horizontal distance 1.5H from the speaker 3. The measurement results of all the test points of the first noise test device 1 are averaged and recorded as Lw c1 ;

[0054] S4. See Figure 6 As shown, the second noise test device 2 is set at each test point to perform noise test. At least three tests are performed at each test point. The measurement parameter is the frequency doubling. The test points include the horizontal distance H from the speaker 3, the horizontal distance 1.2H from the speaker 3, and the horizontal distance 1.5H from the speaker 3. The measurement results of all the test points of the second noise test device 2 are averaged and recorded as Lw c2 ;

[0055] S5, the average value Lw obtained according to step S3 c1 and the average value Lw obtained in step S4 c2 , calculate the insertion loss value of the windshield △ = Lw c1 -Lw c2 ;

[0056] S6. In the outdoor environmental noise test of the wind turbine generator set, the second noise test device 2 is installed to measure the sound pressure level of the wind turbine generator set operating noise at different wind speeds, recorded as L V ; and measure the sound pressure level of the ambient background noise when the wind turbine is shut down, recorded as L V,bg ;

[0057] S7. Correct the windshield insertion loss and correct the noise sound pressure level value L when the wind turbine is running. V '=L V +△, and correct the background noise sound pressure level value L when the wind turbine is shut down V,bg '=L V,bg +△;

[0058] S8, according to the corrected noise sound pressure level value obtained in step S7, calculate the noise sound pressure level value of the wind turbine generator set The sound power level of a wind turbine is Wherein R1 is the horizontal distance between the second noise testing device and the wind turbine generator set.

[0059] Example 2

[0060] The wind turbine generator set noise test and correction system in a strong wind environment provided in this embodiment is used to implement the wind turbine generator set noise test and correction method in a strong wind environment described in Example 1, including:

[0061] A first noise testing device, used as a basic noise testing device to measure noise, comprising a measuring plate, an acoustic sensor and a windproof ball, wherein the acoustic sensor is mounted on the measuring plate, and the windproof ball is mounted at the front end of the acoustic sensor;

[0062] A second noise testing device, wherein a windshield is arranged on the basic noise testing device to measure the noise, wherein the second noise testing device comprises a measuring plate, an acoustic sensor, a windshield ball and a windshield, wherein the acoustic sensor is mounted on the measuring plate, the windshield ball is mounted at the front end of the acoustic sensor, and the windshield is mounted and covers the outer side of the windshield ball;

[0063] A speaker is used as a reference noise source to provide pink noise;

[0064] The windshield insertion loss value calculation module calculates the difference between the measured noise values ​​of the reference noise source by the first noise test device and the second noise test device to obtain the windshield insertion loss value; the first noise test device is set at each test point to perform noise testing, and at least three tests are performed at each test point. The measurement parameter is the frequency doubling, and the test points include the horizontal distance H from the speaker, the horizontal distance 1.2H from the speaker, and the horizontal distance 1.5H from the speaker. The measurement results of all the test points of the first noise test device are averaged and recorded as Lw c1 ; The second noise test device is set at each test point to perform noise test. Each test point is tested at least three times. The measurement parameter is the frequency doubling. The test points include the horizontal distance H from the speaker, the horizontal distance 1.2H from the speaker, and the horizontal distance 1.5H from the speaker. The measurement results of all test points of the second noise test device are averaged and recorded as Lw c2 ; Based on the average value Lw c1 and the average value Lw obtained in step S4 c2 , calculate the insertion loss value of the windshield △ = Lw c1 -Lw c2 ;

[0065] The wind power site noise test module is used to measure the sound pressure level of the wind turbine operating noise at different wind speeds and the sound pressure level of the ambient background noise when the wind turbine is shut down; in the outdoor ambient noise test of the wind turbine, a second noise test device is installed to measure the sound pressure level of the wind turbine operating noise at different wind speeds, recorded as L V ; and measure the sound pressure level of the ambient background noise when the wind turbine is shut down, recorded as L V,bg ;

[0066] The noise sound pressure level correction module corrects the noise sound pressure level value of the wind turbine generator set when it is running and the ambient background noise sound pressure level value when the wind turbine generator set is shut down according to the wind shield insertion loss value; the wind shield insertion loss correction is performed to correct the noise sound pressure level value L when the wind turbine generator set is running. V '=L V +△, and correct the background noise sound pressure level value L when the wind turbine is shut down V,bg '=L V,bg +△;

[0067] The wind turbine noise sound pressure level calculation module calculates the wind turbine noise sound pressure level value according to the corrected wind turbine operating noise sound pressure level value and the ambient background noise sound pressure level value when the wind turbine is shut down; the wind turbine noise sound pressure level value is calculated as follows:

[0068]

[0069] The wind turbine sound power level calculation module calculates the wind turbine sound power level according to the wind turbine noise sound pressure level value. The wind turbine sound power level is Wherein R1 is the horizontal distance between the second noise testing device and the wind turbine generator set.

[0070] The embodiments described above are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, all changes made according to the shape and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for testing and correcting noise of a wind turbine generator set in a strong wind environment, characterized in that: The method is to install a wind shield ball at the front end of an acoustic sensor in the noise test of a wind turbine generator set, and then install a wind shield on the basis of the wind shield ball. The wind shield is pre-calibrated, measured and calculated to obtain the insertion loss value of the wind shield. The insertion loss value of the wind shield is used to compensate for the measurement result of the on-site wind turbine generator set noise test, and then the real noise characteristic result of the wind turbine generator set is obtained, thereby completing the correction of the noise test.

2. The method for testing and correcting noise of a wind turbine generator set in a strong wind environment according to claim 1, characterized in that: The following steps are involved: S1. Two noise testing devices are provided, namely, a first noise testing device and a second noise testing device, wherein the first noise testing device comprises a measuring plate, an acoustic sensor and a windproof ball, and the second noise testing device comprises a measuring plate, an acoustic sensor, a windproof ball and a windproof cover; S2. Set up a loudspeaker at a height of H in the acoustic laboratory, and the sound source of the loudspeaker is pink noise; S3, set the first noise test device at the test points to perform multiple noise tests, the test points include the horizontal distance H from the speaker, the horizontal distance 1.2H from the speaker, and the horizontal distance 1.5H from the speaker, and average the measurement results of all the test points of the first noise test device, which is recorded as Lw c1 ; S4, set the second noise test device at the test points to perform multiple noise tests, the test points include the horizontal distance H from the speaker, the horizontal distance 1.2H from the speaker, and the horizontal distance 1.5H from the speaker, and average the measurement results of all the test points of the second noise test device, recorded as Lw c2 ; S5, the average value Lw obtained according to step S3 c1 and the average value Lw obtained in step S4 c2 , calculate the insertion loss value of the windshield △ = Lw c1 -Lw c2 ; S6. In the outdoor environmental noise test of the wind turbine generator set, a second noise test device is installed to measure the sound pressure level of the wind turbine generator set operating noise at different wind speeds, recorded as L V ; and measure the sound pressure level of the ambient background noise when the wind turbine is shut down, recorded as L V,bg ; S7. Correct the windshield insertion loss and correct the noise sound pressure level value L when the wind turbine is running. V '=L V +△, and correct the background noise sound pressure level value L when the wind turbine is shut down V,bg '=L V,bg +△; S8, according to the corrected noise sound pressure level value obtained in step S7, calculate the noise sound pressure level value of the wind turbine generator set The sound power level of a wind turbine is Wherein R1 is the horizontal distance between the second noise testing device and the wind turbine generator set.

3. The method for testing and correcting noise of a wind turbine generator set in a strong wind environment according to claim 2, characterized in that: The first noise testing device comprises a measuring plate, an acoustic sensor and a windproof ball. The acoustic sensor is installed on the measuring plate, and the windproof ball is installed at the front end of the acoustic sensor.

4. The method for testing and correcting noise of a wind turbine generator set in a strong wind environment according to claim 2, characterized in that: The second noise testing device includes a measuring plate, an acoustic sensor, a windproof ball and a windshield, the acoustic sensor is installed on the measuring plate, the windproof ball is installed at the front end of the acoustic sensor, and the windshield is installed and covers the outside of the windproof ball.

5. The method for testing and correcting noise of a wind turbine generator set in a strong wind environment according to claim 4, characterized in that: The windshield is a semi-spherical wire frame structure, the surface of which is provided with a foam or textile layer with a plurality of uniform small holes, and the surface thickness of the windshield is 13-25 mm.

6. The method for testing and correcting noise of a wind turbine generator set in a strong wind environment according to claim 4, characterized in that: The diameter of the wind shield is not less than 3 times the diameter of the wind shield ball.

7. The method for testing and correcting noise of a wind turbine generator set in a strong wind environment according to claim 2, characterized in that: The step S3 comprises: The first noise test device is set at each test point to perform noise test. At least three tests are performed at each test point. The measurement parameter is the frequency doubling. The test points include the horizontal distance H from the speaker, the horizontal distance 1.2H from the speaker, and the horizontal distance 1.5H from the speaker. The measurement results of all test points of the first noise test device are averaged and recorded as Lw c1 .

8. The method for testing and correcting noise of a wind turbine generator set in a strong wind environment according to claim 2, characterized in that: The step S4 comprises: The second noise test device is set at each test point to perform noise test. Each test point is tested at least three times. The measurement parameter is the frequency doubling. The test points include the horizontal distance H from the speaker, the horizontal distance 1.2H from the speaker, and the horizontal distance 1.5H from the speaker. The measurement results of all test points of the second noise test device are averaged and recorded as Lw c2 .

9. A wind turbine noise test and correction system in a strong wind environment, characterized in that: The method for correcting noise test of a wind turbine generator set in a strong wind environment according to any one of claims 1 to 8 comprises: A first noise testing device, used as a basic noise testing device to measure noise, comprising a measuring plate, an acoustic sensor and a windproof ball, wherein the acoustic sensor is mounted on the measuring plate, and the windproof ball is mounted at the front end of the acoustic sensor; A second noise testing device, wherein a windshield is arranged on the basic noise testing device to measure the noise, wherein the second noise testing device comprises a measuring plate, an acoustic sensor, a windshield ball and a windshield, wherein the acoustic sensor is mounted on the measuring plate, the windshield ball is mounted at the front end of the acoustic sensor, and the windshield is mounted and covers the outer side of the windshield ball; A loudspeaker, used as a reference noise source; The windshield insertion loss value calculation module calculates the difference between the measured noise values ​​of the reference noise source by the first noise test device and the second noise test device to obtain the windshield insertion loss value; Wind power site noise test module, used to measure the sound pressure level of wind turbine operating noise at different wind speeds and the sound pressure level of ambient background noise when the wind turbine is shut down; A noise sound pressure level correction module is used to correct the noise sound pressure level of the wind turbine generator set during operation and the background noise sound pressure level of the environment when the wind turbine generator set is shut down according to the wind shield insertion loss value; A wind turbine generator set noise sound pressure level value calculation module calculates the wind turbine generator set noise sound pressure level value according to the corrected wind turbine generator set operating noise sound pressure level value and the ambient background noise sound pressure level value when the wind turbine generator set is shut down; The wind turbine generator sound power level calculation module calculates the wind turbine generator sound power level according to the wind turbine generator noise sound pressure level value.

10. A wind turbine noise test and correction system in a strong wind environment according to claim 9, characterized in that: The windshield insertion loss value calculation module comprises: The first noise test device is set at each test point to perform noise test. At least three tests are performed at each test point. The measurement parameter is the frequency doubling. The test points include the horizontal distance H from the speaker, the horizontal distance 1.2H from the speaker, and the horizontal distance 1.5H from the speaker. The measurement results of all test points of the first noise test device are averaged and recorded as Lw c1 ; The second noise test device is set at each test point to perform noise test. Each test point is tested at least three times. The measurement parameter is the frequency doubling. The test points include the horizontal distance H from the speaker, the horizontal distance 1.2H from the speaker, and the horizontal distance 1.5H from the speaker. The measurement results of all test points of the second noise test device are averaged and recorded as Lw c2 ; According to the average value Lw c1 and the average value Lw obtained in step S4 c2 , calculate the insertion loss value of the windshield △ = Lw c1 -Lw c2 .

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