Systematic noise reduction method and system for wind turbine generators

Abstract

The application provides a systematic noise reduction method and system for a wind turbine, which comprises the following steps: conducting field research on the wind turbine, performing theoretical calculation and numerical simulation according to the measured data, and analyzing the characteristics of multiple noise sources of the wind turbine; based on the characteristics of the multiple noise sources, designing corresponding passive noise reduction products for each typical noise source; designing active noise reduction products for the noise frequency range in the wind turbine cabin and the cooling cabin to suppress the medium and low frequency noise in the cabin; installing the noise reduction products on the wind turbine site to conduct noise reduction test, evaluating the noise reduction effect, and optimizing the design parameters of the noise reduction products and the system noise reduction strategy of the wind turbine according to the noise reduction effect. The method comprehensively uses theoretical research, numerical simulation, sample production and test installation, and test testing, and can systematically reduce the noise of the wind turbine, and improve the comprehensiveness, accuracy and universality of noise reduction.

Description

Technical Field

[0001] This application relates to the field of noise reduction technology for wind turbine generators, and in particular to a systematic noise reduction method and system for wind turbine generators. Background Technology

[0002] As the scale of wind turbine installations continues to expand, wind farms are gradually moving closer to residential areas and ecologically sensitive regions. The noise generated by wind turbines during operation is becoming increasingly prominent, seriously impacting environmental protection and residents' lives, and hindering the site selection, construction, and operation of wind farms. Therefore, it is necessary to control the noise from wind turbines.

[0003] In related technologies, noise reduction solutions for wind turbine generators mostly focus on the development of new models, primarily using localized noise reduction methods. These solutions are difficult to apply to the noise reduction retrofitting of large-scale in-service units and suffer from high costs, poor adaptability, and maintenance difficulties. Furthermore, wind turbine generators have complex structures and generate various types of noise. Existing noise reduction technologies have limited effectiveness in controlling low-frequency noise, making it difficult to achieve effective control of noise across the entire frequency band, and the noise reduction effect cannot meet practical needs.

[0004] Therefore, how to systematically reduce the noise of wind turbine generators and achieve precise control of various types of noise has become an urgent problem to be solved. Summary of the Invention

[0005] This application aims to at least partially address one of the technical problems in the related art.

[0006] Therefore, the first objective of this application is to propose a systematic noise reduction method for wind turbine generator sets. This method, through theoretical research, numerical simulation, sample fabrication and trial installation, and experimental testing, studies the noise sources and propagation characteristics of wind turbine generator sets, formulates noise reduction strategies for the wind turbine generator set system, develops targeted passive noise reduction technologies and products for various typical noise sources, and develops targeted active noise reduction technologies and products for specific frequency ranges of noise within the nacelle. Based on this, a comprehensive and systematic noise reduction scheme for wind turbine generator sets is formed, which is then demonstrated in relevant wind farms. Through the implementation and tracking operation of noise reduction strategies for specific units in the demonstration project, the noise reduction design method for wind turbine generator set systems can be optimized, guiding the noise reduction design of wind turbine generator sets in other projects.

[0007] The second objective of this application is to propose a systematic noise reduction system for wind turbine generator sets.

[0008] The third objective of this application is to propose an electronic device.

[0009] The fourth objective of this application is to provide a computer-readable storage medium.

[0010] To achieve the above objectives, the first aspect of this application is to propose a systematic noise reduction method for wind turbine generator sets, comprising the following steps:

[0011] We conducted on-site investigations of the wind turbine generator sets to be noise-reduced, and performed theoretical calculations and numerical simulations based on the measured data to analyze the characteristics of multiple noise sources of the wind turbine generator sets. Based on the characteristics of the multiple noise sources, corresponding passive noise reduction products are designed for each typical noise source of the wind turbine generator set, wherein at least one of the passive noise reduction products uses metamaterials for sound absorption. The noise frequency range within the wind turbine nacelle and cooling nacelle is extracted from the characteristics of the multiple noise sources. Active noise reduction products are designed for the noise frequency range, and the low-to-medium frequency noise within the nacelle is suppressed by the active noise reduction products. The passive noise reduction product and the active noise reduction product, which have been initially manufactured, are installed at the working site of the wind turbine generator set for noise reduction tests. The noise reduction effect of the noise reduction test is evaluated, and the design parameters of the noise reduction product and the system noise reduction strategy of the wind turbine generator set are optimized based on the noise reduction effect.

[0012] Optionally, the analysis of the characteristics of multiple noise sources of the wind turbine generator includes: performing theoretical calculations on the measured data, analyzing the location, cause, magnitude characteristics, spectral characteristics and propagation path of each noise source, and quantifying the contribution ratio of each noise source; integrating the analysis results of each noise source to construct a wind field noise distribution model coupling multiple noise sources.

[0013] Optionally, the typical noise sources include blade noise, nacelle cooling duct noise, nacelle interior noise, and tower base equipment noise. The design of corresponding passive noise reduction products for each typical noise source of the wind turbine includes: designing a noise reduction structure for the blades based on their aerodynamic characteristics, wherein the noise reduction structure is used to reduce the aerodynamic noise generated by the wind turbine during operation; designing a silencer to be installed on the nacelle cooling duct, wherein the silencer is used to absorb various noises from the nacelle cooling duct; and designing a superstructure sound-absorbing noise reduction module and a superstructure sound barrier inside the nacelle and at the base of the tower, respectively.

[0014] Optionally, the active noise cancellation product designed for the noise frequency range includes: arranging a microphone array to consider the reflection and superposition characteristics of sound waves within the wind turbine nacelle and the cooling nacelle; monitoring the wind turbine noise within the nacelle using noise signal acquisition and processing equipment; calculating the reverse sound wave value corresponding to the real-time wind turbine noise using a preset sound wave generation algorithm when the real-time wind turbine noise exceeds a noise threshold, and generating the reverse sound wave using the microphone array; detecting the suppression effect of the reverse sound wave on broadband noise, and optimizing the active noise cancellation product based on the suppression effect.

[0015] Optionally, after the passive noise reduction product and the active noise reduction product that have been initially manufactured are installed at the working site of the wind turbine generator set, the method further includes: testing the impact of adding the noise reduction structure on the operating parameters of the wind turbine generator set; simulating the changes in airflow and noise after adding the noise reduction structure through simulation applications, and optimizing the size parameters and material selection of the noise reduction structure based on the simulation results and the impact on the operating parameters of the wind turbine generator set.

[0016] Optionally, after optimizing the size parameters and material selection of the noise reduction structure, the method further includes: adjusting the thickness of the metamaterial attachment of the metamaterial noise reduction module according to the internal space limitations of the cabin where the metamaterial noise reduction module is currently located.

[0017] Optionally, optimizing the design parameters of the noise reduction product and the system noise reduction strategy of the wind turbine generator set based on the noise reduction effect includes: setting the passive noise reduction product or the active noise reduction product separately on different wind turbine generator sets, and testing the independent noise reduction effect of the passive noise reduction product or the active noise reduction product; formulating a combined noise reduction strategy for different wind turbine generator sets based on the actual operating parameters of different wind turbine generator sets and the independent noise reduction effect; testing the noise reduction effect of the combined noise reduction strategy, and iteratively optimizing the combined noise reduction strategy based on the noise reduction effect of the combined noise reduction strategy until the noise reduction effect of the combined noise reduction strategy reaches the target value.

[0018] To achieve the above objectives, a second aspect of this application also proposes a systematic noise reduction system for wind turbine generator sets, comprising the following modules: The analysis module is used to conduct on-site investigations of the wind turbine generator sets to be noise-reduced, perform theoretical calculations and numerical simulations based on measured data, and analyze the characteristics of multiple noise sources of the wind turbine generator sets. A passive noise reduction module is used to design corresponding passive noise reduction products for each typical noise source of the wind turbine generator set based on the characteristics of the plurality of noise sources, wherein at least one of the passive noise reduction products uses metamaterials for sound absorption. An active noise reduction module is used to extract the noise frequency range within the wind turbine nacelle and cooling nacelle from the characteristics of the multiple noise sources, design active noise reduction products for the noise frequency range, and suppress low- and mid-frequency noise within the nacelle using the active noise reduction products. The evaluation and optimization module is used to install the initially manufactured passive noise reduction product and the active noise reduction product at the working site of the wind turbine generator set for noise reduction tests, evaluate the noise reduction effect of the noise reduction test, and optimize the design parameters of the noise reduction product and the system noise reduction strategy of the wind turbine generator set based on the noise reduction effect.

[0019] To achieve the above objectives, a third aspect of this application also provides an electronic device, comprising: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, the instructions being executed by the at least one processor to enable the at least one processor to perform a systematic noise reduction method for a wind turbine generator as described in any of the first aspects above.

[0020] To achieve the above objectives, the fourth aspect of this application also proposes a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the systematic noise reduction method for wind turbine generator sets as described in any of the first aspects above.

[0021] The technical solutions provided by the embodiments of this application bring at least the following beneficial effects: This application studies the noise sources and propagation characteristics of wind turbine generators through theoretical research, numerical simulation, sample production and trial installation, and experimental testing. It formulates noise reduction strategies for wind turbine generator systems, develops targeted passive noise reduction technologies and products for various typical noise sources, and develops targeted active noise reduction technologies and products for specific frequency ranges of noise within the turbine cabin. Thus, this application forms a comprehensive and systematic noise reduction solution for wind turbine generators. Through systematic noise source identification and propagation characteristic research, it develops targeted passive noise reduction products and active noise reduction technologies, forming an integrated noise reduction solution that achieves full-frequency, precise control of various noises from wind turbine generators. This application covers the complete process from theoretical research to product development, demonstration application, and optimization and improvement. The resulting noise reduction solution is highly versatile and replicable, applicable to both newly built wind turbine generators and noise reduction retrofits of existing generators. Through on-site demonstration applications and follow-up optimization, the noise reduction design method is continuously improved, providing strong technical support for the green and sustainable development of the wind power industry and helping to promote the deployment and promotion of wind power near residential areas.

[0022] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0023] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein: Figure 1 This is a flowchart illustrating a systematic noise reduction method for a wind turbine generator set proposed in an embodiment of this application; Figure 2 This is a schematic diagram illustrating the workflow of a specific systematic noise reduction method for a wind turbine generator set proposed in an embodiment of this application. Figure 3This is a schematic diagram of the structure of a systematic noise reduction system for a wind turbine generator set proposed in an embodiment of this application. Detailed Implementation

[0024] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0025] The following description, with reference to the accompanying drawings, illustrates a systematic noise reduction method and system for wind turbine generator sets as proposed in the embodiments of this application.

[0026] Figure 1 This is a flowchart of a systematic noise reduction method for wind turbine generators proposed in an embodiment of this application, as shown below. Figure 1 As shown, the method includes the following steps: Step S101: Conduct on-site investigation of the wind turbine generator set to be noise-reduced, perform theoretical calculations and numerical simulations based on the measured data, and analyze the characteristics of multiple noise sources of the wind turbine generator set.

[0027] It should be noted that the systematic noise reduction method for wind turbine units in this application comprehensively utilizes multidisciplinary interdisciplinary technologies, in accordance with... Figure 2 The integrated research path shown here, from theoretical research to numerical simulation to product development to experimental verification to on-site evaluation, addresses the typical noise problems faced by wind turbines during long-term operation. It can suppress noise from multiple aspects, including aerodynamic noise, structural vibration noise, mechanical equipment noise, and electrical system noise, and constructs a system noise reduction solution that is applicable to typical wind farms and has universality and replicability.

[0028] In practice, this step first studies the propagation characteristics of wind turbine noise sources. Addressing the current issues of complex noise sources and coupled propagation in wind turbines, coupled with a lack of systematic research, this study investigates the noise mechanism. Field surveys and tests are conducted in wind farms, followed by comprehensive analysis of the noise source characteristics of wind turbines using relevant theoretical calculations and numerical simulation techniques.

[0029] In one embodiment of this application, the characteristics of multiple noise sources of a wind turbine generator are analyzed, including: performing theoretical calculations on measured data to analyze the location, cause, magnitude, spectral characteristics and propagation path of each noise source, and quantifying the contribution ratio of each noise source; integrating the analysis results of each noise source to construct a wind field noise distribution model that couples multiple noise sources.

[0030] Specifically, this embodiment identifies multiple noise sources of the wind turbine based on measured noise data, including mechanical noise, aerodynamic noise, equipment operating noise, and structural vibration noise. Then, noise and vibration tests of the turbine system are conducted, and the data is processed. Through various analysis and processing techniques such as noise modeling, the location, causes, magnitude characteristics, spectral characteristics, and propagation paths of the main noise sources are analyzed, and the contribution ratio of different noise sources is quantified. Furthermore, based on the noise source characteristics and propagation patterns analyzed previously, the analysis results are integrated to quantify the overall distribution, and a full-frequency noise model is constructed to build a multi-source coupled noise distribution model.

[0031] Therefore, this application, through the study of noise source propagation characteristics, can clarify the technical approach and objectives of noise reduction, provide data support for the design of subsequent noise reduction solutions, and guide the design and development of subsequent passive noise reduction solutions and products, as well as active noise reduction solutions and products.

[0032] Step S102: Based on the characteristics of multiple noise sources, design corresponding passive noise reduction products for each typical noise source of the wind turbine generator set, wherein at least one passive noise reduction product uses metamaterials for sound absorption.

[0033] Specifically, this step involves developing targeted passive noise reduction products for various typical noise sources in wind turbine units. Passive noise reduction refers to reducing noise sources or blocking noise propagation paths through physical barriers. It can be achieved through passive noise reduction methods such as resistive silencing, reactive silencing, and impedance composite silencing, which are particularly effective for narrowband noise. Furthermore, this application utilizes metamaterial sound-absorbing materials to design one or more of these passive noise reduction products.

[0034] Metamaterials are a class of materials with special artificial structures that achieve extraordinary control over sound waves through carefully designed microscopic or macroscopic structural units (rather than the chemical composition of traditional materials). This application applies metamaterials to passive noise reduction products for wind turbine units, achieving high-efficiency sound absorption through a special internal sound-absorbing structure, thereby improving the product's sound absorption coefficient.

[0035] In one embodiment of this application, typical noise sources include blade noise, nacelle cooling duct noise, nacelle interior noise, and tower base equipment noise. Passive noise reduction products are designed for each typical noise source of the wind turbine generator set, including: designing a noise reduction structure for the blades based on their aerodynamic characteristics, wherein the noise reduction structure is used to reduce the aerodynamic noise generated by the wind turbine during operation; designing a silencer to be installed on the nacelle cooling duct, wherein the silencer is used to absorb various noises from the nacelle cooling duct; and designing a superstructure sound-absorbing noise reduction module and a superstructure sound barrier inside the nacelle and at the base of the tower of the wind turbine generator set, respectively.

[0036] Specifically, this embodiment combines various factors such as comprehensive noise reduction strategies for wind turbine generators, installation interface size requirements, load, and climatic conditions to conduct targeted acoustic, material, structural, and manufacturing process design for passive noise reduction products. This resulted in the development of the noise reduction products, and laboratory performance tests were conducted on the initial design of the passive noise reduction products to verify their acoustic, mechanical, and noise reduction capabilities. Thus, passive noise reduction devices were developed for four typical noise sources: blades, nacelle cooling ducts, the interior of the wind turbine nacelle, and equipment at the base of the tower.

[0037] Among these measures, blade noise reduction is achieved by improving the aerodynamic design of the blades to reduce the aerodynamic noise generated by the wind turbine during operation. The designed blade noise reduction structure includes a serrated trailing edge, blade tip winglets, and a vortex generator. Then, silencers are installed in the nacelle cooling ducts for sound absorption. Furthermore, a superstructure sound-absorbing and noise-reducing module is installed inside the wind turbine nacelle (for mechanical components such as planetary gears) for sound absorption, and a superstructure sound barrier is designed at the base of the tower (for equipment at the base of the tower such as transformer air cooling equipment) for sound insulation.

[0038] In this embodiment, metamaterials are used instead of traditional sound-absorbing materials. For example, a metamaterial is designed on the porous foamed polyurethane in the relevant embodiments, organically integrating a low-frequency resonant acoustic structure with the porous material to develop a noise-reducing metamaterial. The material is then modified to meet the flame-retardant rating of B1. The resulting metamaterial is then used to design sound-absorbing and noise-reducing modules and sound barriers.

[0039] It should be noted that, since there is no relevant research on the application of metamaterials for noise reduction in the field of wind turbine generator noise reduction, in order to ensure the rationality of the design of metamaterial noise reduction products, in the subsequent embodiments, representative wind turbine generators can be selected for on-site installation and testing of metamaterial noise reduction products, collect actual operating data, further verify the noise reduction effect, and optimize the product design scheme.

[0040] Step S103: Extract the noise frequency range of the wind turbine nacelle and cooling nacelle from the characteristics of multiple noise sources, design active noise reduction products for the noise frequency range, and suppress low- and mid-frequency noise in the nacelle through active noise reduction products.

[0041] Specifically, this step involves developing targeted active noise reduction products for specific noise frequency ranges within the wind turbine nacelle (the specific frequency range values ​​can be read from the characteristics of multiple noise sources obtained in step S101), thereby achieving active noise reduction within the wind turbine nacelle cover and cooling nacelle.

[0042] As mentioned above, since passive noise reduction technology is not very effective at eliminating broadband noise, this application combines active noise control (ANC) technology with passive noise reduction. Based on the principle of active noise reduction according to Young's interference theory, that is, according to the principle of destructive interference or sound radiation suppression of two sound waves, the sound wave radiation generated by the secondary sound source (secondary sound source) is equal in magnitude and opposite in phase to the sound pressure of the primary sound source (the source being canceled), and they cancel each other out, thereby achieving the purpose of reducing noise.

[0043] Passive noise reduction products can target noise above 500Hz, while the active noise reduction products designed in this step mainly target the mid-to-low frequency range below 1000Hz. Since in practical applications, noise in some wind farms is concentrated in the low-frequency range, and there is significant noise caused by mechanical structure vibration around 350Hz, this application combines active noise reduction technology for low frequencies with passive noise reduction technology for high frequencies to achieve full-frequency noise control of wind turbine units.

[0044] In one embodiment of this application, an active noise cancellation product is designed for a noise frequency range, including: arranging a microphone array to consider the reflection and superposition characteristics of sound waves in the wind turbine nacelle and cooling nacelle; monitoring the wind turbine noise in the nacelle using noise signal acquisition and processing equipment; calculating the reverse sound wave value corresponding to the real-time wind turbine noise using a preset sound wave generation algorithm when the real-time wind turbine noise is greater than a noise threshold, and generating the reverse sound wave using the microphone array; detecting the suppression effect of the reverse sound wave on broadband noise, and optimizing the active noise cancellation product based on the suppression effect.

[0045] Specifically, this embodiment installs the designed active noise cancellation system inside the nacelle at the top of the wind turbine tower, equipped with a control system that automatically activates when the wind turbine noise exceeds a threshold. A microphone array is strategically positioned to address the reflection and superposition characteristics of sound waves within the large enclosed space of the wind turbine nacelle. Noise signal acquisition and processing software is pre-developed, along with an efficient sound wave generation algorithm to achieve rapid processing and generation of reverse sound waves. Furthermore, a wind turbine nacelle model and noise simulation platform can be built. The effectiveness of the active noise cancellation system in suppressing broadband noise can be quantified using an acoustic head-mounted array. Performance, durability, and reliability tests of the active noise cancellation equipment in a semi-anechoic chamber are conducted, ultimately leading to the development of a modular active noise cancellation kit compatible with mainstream wind turbine models.

[0046] Step S104: Install the preliminarily manufactured passive noise reduction products and active noise reduction products at the working site of the wind turbine generator set for noise reduction tests, evaluate the noise reduction effect of the noise reduction test, and optimize the design parameters of the noise reduction products and the system noise reduction strategy of the wind turbine generator set based on the noise reduction effect.

[0047] Specifically, this step involves demonstrating and evaluating the overall noise reduction scheme for wind turbine generator sets. The system noise reduction scheme for wind turbine generator sets described in steps S101 to S103 will be demonstrated in a specific wind farm. This includes installing and verifying the noise reduction products and conducting noise reduction effect tests. Based on the actual test and evaluation results, the design parameters of noise reduction products, such as the size parameters of passive noise reduction products, the arrangement of active noise reduction products, and the sound wave generation algorithm, will be optimized. Furthermore, the combination of active and passive noise reduction strategies and the installation methods of the products will also be optimized to improve the overall noise reduction strategy.

[0048] Furthermore, by implementing and tracking the noise reduction strategies of specific units in the demonstration project, a noise reduction design method for wind turbine generator systems will be established, forming a standardized and replicable wind turbine generator noise reduction technology system to guide the noise reduction design of other wind turbine generators.

[0049] In one embodiment of this application, after the preliminarily manufactured passive noise reduction product and active noise reduction product are installed at the working site of the wind turbine generator set, the method further includes: testing the impact of adding the noise reduction structure on the operating parameters of the wind turbine generator set; simulating the changes in airflow and noise after adding the noise reduction structure through simulation applications, and optimizing the size parameters and material selection of the noise reduction structure based on the simulation results and the impact on the operating parameters of the wind turbine generator set; and adjusting the thickness of the metamaterial attachment of the metamaterial noise reduction module according to the internal space limitations of the nacelle where the metamaterial noise reduction module is currently located.

[0050] Specifically, the noise reduction products installed and tested in this embodiment include four sets of passive noise reduction products targeting four typical noise sources: blades, nacelle cooling ducts, nacelle interior, and tower base equipment, as well as one set of active noise reduction products. Among these, the blade noise reduction products, which involve adding special structures such as serrations, guide vanes, and baffles to the blade surface or trailing edge, increase the blade's weight and localized stress, potentially posing reliability risks during blade connection and operation. This may also lead to a decrease in the wind turbine's lift-to-drag ratio and operational fluctuations. Therefore, this embodiment focuses on optimizing the serration size and material selection for the blade noise reduction structure, quantifying the impact on turbine operating parameters such as the decrease in lift-to-drag ratio and load fluctuations. Furthermore, computational fluid dynamics (CFD) or acoustic simulations are used to pre-simulate airflow and noise changes. The dimensions and materials of the noise reduction structure are then adjusted based on the simulated changes and variations in operating parameters to minimize the impact of adding blade noise reduction products on operational reliability.

[0051] Furthermore, in optimizing the design of the novel meta-structure sound-absorbing material, this embodiment considers the space limitations within the nacelle in practical applications. To avoid situations where installation in the nacelle is impossible or would interfere with existing equipment, the thickness of the meta-structure material is adjusted to not exceed that of traditional sound-absorbing cotton, thereby reducing nacelle space occupation and eliminating the need for frequent replacements when applied to different units. In this embodiment, a meta-structure sound barrier is installed around the equipment at the base of the tower, serving only a sound insulation function and not affecting the structure or operation of the wind turbine. The active noise reduction system is installed inside the nacelle and is a newly added circuit and control system within the nacelle. It does not change the wind turbine's structure or operating characteristics, has a small integrated size, requires connection to existing circuits, but increases operating energy consumption by a relatively low amount.

[0052] In one embodiment of this application, optimizing the design parameters of noise reduction products and the system noise reduction strategy of wind turbine generators based on noise reduction effect includes: setting passive noise reduction products or active noise reduction products separately on different wind turbine generators, and testing the independent noise reduction effect of the passive noise reduction products or active noise reduction products; formulating a combined noise reduction strategy for different wind turbine generators based on the actual operating parameters and independent noise reduction effect of different wind turbine generators; testing the noise reduction effect of the combined noise reduction strategy, and iteratively optimizing the combined noise reduction strategy based on the noise reduction effect of the combined noise reduction strategy until the noise reduction effect of the combined noise reduction strategy reaches the target value.

[0053] Specifically, in this embodiment, the four sets of passive noise reduction products and one set of active noise reduction products that have been developed were individually verified in the laboratory. During field testing, the effects and costs of different individual noise reduction products were also independently analyzed and verified on different wind turbines. Based on the actual conditions of each demonstration site, different product combination noise reduction schemes were developed to further clarify the noise reduction effects of different product combinations and form a noise reduction scheme guidance manual to provide data and technical support for subsequent promotion.

[0054] For example, for wind turbines whose noise is mainly concentrated in different frequency bands, different combinations of active and passive noise reduction products can be set up. For instance, for wind turbines that mainly generate high-frequency noise, the number of passive noise reduction products using metamaterials can be increased.

[0055] Furthermore, the installation scheme for noise reduction products was studied, and the installation and operation tracking verification of the noise reduction products were completed. The noise reduction effect of the system noise reduction scheme was tested and evaluated. Based on the evaluation results, the scheme was iteratively optimized and continuously improved until the noise reduction effect of the combined noise reduction strategy reached the target value. For example, the suppression effect of high-frequency noise and mid-to-low-frequency noise of wind turbine generators met the requirements of wind turbine generator application scenarios.

[0056] In summary, the systematic noise reduction method for wind turbine generator sets in this application utilizes theoretical research, numerical simulation, sample fabrication and trial installation, and experimental testing to study the noise sources and propagation characteristics of wind turbine generator sets. This leads to the formulation of a systemic noise reduction strategy for wind turbine generator sets, the development of targeted passive noise reduction technologies and products for various typical noise sources, and the development of targeted active noise reduction technologies and products for specific frequency ranges within the turbine cabin. Consequently, this method forms a comprehensive and systematic noise reduction solution for wind turbine generator sets. Through systematic noise source identification and propagation characteristic research, it develops targeted passive and active noise reduction products, forming an integrated noise reduction solution that achieves precise, full-frequency control of various noises from wind turbine generator sets. This method covers the entire process from theoretical research to product development, demonstration applications, and optimization improvements. The resulting noise reduction solution is highly versatile and replicable, applicable to both newly built wind turbine generator sets and noise reduction retrofits of existing units. Through on-site demonstration applications and continuous optimization, the noise reduction design method is continuously improved, providing strong technical support for the green and sustainable development of the wind power industry and contributing to the promotion and application of wind power near residential areas.

[0057] To achieve the above embodiments, this application also proposes a systematic noise reduction system for wind turbine generator sets. Figure 3 This is a schematic diagram of the structure of a systematic noise reduction system for a wind turbine generator set proposed in an embodiment of this application, as shown below. Figure 3 As shown, the system includes: Analysis module 100 is used to conduct on-site investigations of the wind turbine generator set to be noise-reduced, perform theoretical calculations and numerical simulations based on measured data, and analyze the characteristics of multiple noise sources of the wind turbine generator set.

[0058] The passive noise reduction module 200 is used to design corresponding passive noise reduction products for each typical noise source of a wind turbine based on the characteristics of multiple noise sources, wherein at least one passive noise reduction product uses metamaterials for sound absorption.

[0059] The active noise cancellation module 300 is used to extract the noise frequency range within the wind turbine nacelle and cooling nacelle from the characteristics of multiple noise sources, and to design active noise cancellation products for the noise frequency range, thereby suppressing low- and mid-frequency noise within the nacelle.

[0060] The evaluation and optimization module 400 is used to install the initially manufactured passive noise reduction products and active noise reduction products at the working site of the wind turbine generator set for noise reduction tests, evaluate the noise reduction effect of the noise reduction test, and optimize the design parameters of the noise reduction products and the system noise reduction strategy of the wind turbine generator set based on the noise reduction effect.

[0061] It should be noted that the explanation of the aforementioned embodiment of the systematic noise reduction method for wind turbine generator sets also applies to the system in this embodiment, and will not be repeated here.

[0062] In summary, the systematic noise reduction system for wind turbine generators in this application, through theoretical research, numerical simulation, sample fabrication and trial installation, and experimental testing, studies the noise sources and propagation characteristics of wind turbine generators, formulates noise reduction strategies for the wind turbine generator system, develops targeted passive noise reduction technologies and products for various typical noise sources, and develops targeted active noise reduction technologies and products for specific frequency ranges of noise within the nacelle. Based on this, a comprehensive noise reduction scheme for wind turbine generators is formed, which is then demonstrated in relevant wind farms. Through the implementation and tracking operation of noise reduction strategies for specific units in the demonstration project, the noise reduction design method for wind turbine generator systems can be optimized, guiding the noise reduction design of wind turbine generators in other projects.

[0063] To implement the above embodiments, this application also proposes an electronic device, including: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, the instructions being executed by the at least one processor to enable the at least one processor to perform the systematic noise reduction method for wind turbine generator sets as described in any of the first aspect embodiments above.

[0064] To implement the above embodiments, this application also proposes a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the systematic noise reduction method for wind turbine generator sets as described in any one of the first aspect embodiments above.

[0065] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0066] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0067] Any process or method description in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing custom logic functions or processes, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as should be understood by those skilled in the art to which embodiments of this application pertain.

[0068] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0069] It should be understood that various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0070] Those skilled in the art will understand that all or part of the steps of the methods described in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, it includes one or a combination of the steps of the method embodiments.

[0071] Furthermore, the functional units in the various embodiments of this application can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

[0072] The storage medium mentioned above can be a read-only memory, a disk, or an optical disk, etc. Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of this application.

Claims

1. A systematic noise reduction method for wind turbine generator sets, characterized in that, Includes the following steps: We conducted on-site investigations of the wind turbine generator sets to be noise-reduced, and performed theoretical calculations and numerical simulations based on the measured data to analyze the characteristics of multiple noise sources of the wind turbine generator sets. Based on the characteristics of the multiple noise sources, corresponding passive noise reduction products are designed for each typical noise source of the wind turbine generator set, wherein at least one of the passive noise reduction products uses metamaterials for sound absorption. The noise frequency range within the wind turbine nacelle and cooling nacelle is extracted from the characteristics of the multiple noise sources. Active noise reduction products are designed for the noise frequency range, and the low-to-medium frequency noise within the nacelle is suppressed by the active noise reduction products. The passive noise reduction product and the active noise reduction product, which have been initially manufactured, are installed at the working site of the wind turbine generator set for noise reduction tests. The noise reduction effect of the noise reduction test is evaluated, and the design parameters of the noise reduction product and the system noise reduction strategy of the wind turbine generator set are optimized based on the noise reduction effect.

2. The method according to claim 1, characterized in that, The analysis of the characteristics of multiple noise sources in the wind turbine generator set includes: The measured data are used to perform theoretical calculations to analyze the location, cause, magnitude, spectral characteristics and propagation path of each noise source, and to quantify the contribution ratio of each noise source. By integrating the analysis results of each noise source, a wind field noise distribution model coupling multiple noise sources is constructed.

3. The method according to claim 1, characterized in that, The typical noise sources include blade noise, nacelle cooling duct noise, nacelle interior noise, and tower base equipment noise. The passive noise reduction products designed for each typical noise source of the wind turbine generator set include: Based on the aerodynamic characteristics of the blades, a noise reduction structure is designed for the blades, wherein the noise reduction structure is used to reduce the aerodynamic noise generated by the wind turbine during operation; A silencer is designed and installed on the cabin cooling duct, wherein the silencer is used to absorb various noises on the cabin cooling duct; Superstructure sound-absorbing and noise-reducing modules and superstructure sound barriers are designed inside the nacelle of the wind turbine generator and at the bottom of the tower, respectively.

4. The method according to claim 1, characterized in that, The active noise cancellation product designed for the aforementioned noise frequency range includes: A microphone array is arranged to take into account the reflection and superposition characteristics of sound waves in the wind turbine nacelle and the cooling nacelle; The noise of the fan in the nacelle is monitored by noise signal acquisition and processing equipment. When the real-time fan noise is greater than the noise threshold, the reverse sound wave value corresponding to the real-time fan noise is calculated by a preset sound wave generation algorithm, and the reverse sound wave is generated by the microphone array. The effect of the reverse acoustic wave on suppressing broadband noise is detected, and the active noise cancellation product is optimized based on the suppression effect.

5. The method according to claim 3, characterized in that, After the passive noise reduction product and the active noise reduction product, which have been initially manufactured, are installed at the working site of the wind turbine generator set, the process further includes: Test the impact of adding the noise reduction structure on the operating parameters of the wind turbine generator set; The changes in airflow and noise after the noise reduction structure is installed are simulated using simulation applications. Based on the simulation results and the impact on the operating parameters of the wind turbine generator, the size parameters and material selection of the noise reduction structure are optimized.

6. The method according to claim 5, characterized in that, After optimizing the dimensional parameters and material selection of the noise reduction structure, the method further includes: Based on the internal space limitations of the cabin where the metamaterial of the metamaterial sound absorption and noise reduction module is currently located, the thickness of the metamaterial attachment of the metamaterial sound absorption and noise reduction module is adjusted.

7. The method according to claim 1, characterized in that, The optimization of the design parameters of the noise reduction product and the system noise reduction strategy of the wind turbine generator based on the noise reduction effect includes: The passive noise reduction product or the active noise reduction product was installed separately on different wind turbine generator sets, and the independent noise reduction effect of the passive noise reduction product or the active noise reduction product was tested. Based on the actual operating parameters of different wind turbine generator sets and the independent noise reduction effect, a combined noise reduction strategy for different wind turbine generator sets is formulated. The noise reduction effect of the combined noise reduction strategy is tested, and the combined noise reduction strategy is iteratively optimized based on the noise reduction effect until the noise reduction effect of the combined noise reduction strategy reaches the target value.

8. A systematic noise reduction system for wind turbine generator sets, characterized in that, Includes the following modules: The analysis module is used to conduct on-site investigations of the wind turbine generator sets to be noise-reduced, perform theoretical calculations and numerical simulations based on measured data, and analyze the characteristics of multiple noise sources of the wind turbine generator sets. A passive noise reduction module is used to design corresponding passive noise reduction products for each typical noise source of the wind turbine generator set based on the characteristics of the plurality of noise sources, wherein at least one of the passive noise reduction products uses metamaterials for sound absorption. An active noise reduction module is used to extract the noise frequency range within the wind turbine nacelle and cooling nacelle from the characteristics of the multiple noise sources, design active noise reduction products for the noise frequency range, and suppress low- and mid-frequency noise within the nacelle using the active noise reduction products. The evaluation and optimization module is used to install the initially manufactured passive noise reduction product and the active noise reduction product at the working site of the wind turbine generator set for noise reduction tests, evaluate the noise reduction effect of the noise reduction test, and optimize the design parameters of the noise reduction product and the system noise reduction strategy of the wind turbine generator set based on the noise reduction effect.

9. An electronic device, comprising: At least one processor; as well as A memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor to enable the at least one processor to perform a systematic noise reduction method for a wind turbine generator as described in any one of claims 1-7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the systematic noise reduction method for wind turbine generator sets as described in any one of claims 1-7.

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