A substation active control noise reduction method, device, equipment and medium

Abstract

The present application belongs to the technical field of active noise control, and particularly relates to a substation active control noise reduction method, device, equipment and medium. The active noise control method provided by the present application divides the noise distribution map of the noise elimination array area into a first grid array by grid division of the active control noise eliminator array corresponding to the noise distribution map. Each first grid is further divided into a second grid array by grid division, and each first grid corresponds to a second grid array. The sound pressure level in each second grid is determined, the sound pressure level of each first grid is determined according to the sound pressure level of each second grid in the second grid array, the control sound pressure level of the corresponding noise elimination unit is determined according to the sound pressure level of the first grid, and noise reduction is further performed. The present application collects the distribution of noise at the discharge interface, each noise elimination unit can independently control the active noise reduction amplitude, and the corresponding noise reduction effect can be adopted according to the noise distribution at the noise discharge interface to accurately adjust the noise discharge in the corresponding area of the noise reduction unit.

Description

Technical Field

[0001] This invention belongs to the field of active noise reduction control technology, specifically relating to an active noise reduction method, device, equipment, and medium for substations. Background Technology

[0002] An array-type active control silencer refers to an array composed of several active control silencers arranged in a certain pattern. Generally speaking, due to ventilation requirements, one wall of a machine room is designed to be open or completely unenclosed to serve as a ventilation surface. Simultaneously, due to noise leakage, this forms a noise emission interface. In noise control of machine rooms such as substations, silencers and sound-absorbing louvers are often installed. However, their noise reduction frequency bands cannot adequately cover the noise characteristic frequency bands of the substation, resulting in relatively poor noise reduction effects.

[0003] Chinese patent CN208174980U discloses an active noise cancellation device based on a speaker array, which eliminates spatial noise through an active noise cancellation module comprising a speaker array, a microphone, and an active noise cancellation module. This active noise cancellation device uses the microphone to measure noise signals, the active noise cancellation module to generate noise cancellation signals, and then plays the noise cancellation signals through the speakers to achieve the elimination of spatial noise. While this patent can cover the noise frequency band, its noise control method is coarse, resulting in wasted power in the active noise cancellation process. Summary of the Invention

[0004] The purpose of this invention is to provide a method, device, equipment, and medium for active control noise reduction in substations to solve the problems existing in the prior art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] In a first aspect, the present invention provides an active control noise reduction method for substations, comprising the following steps:

[0007] Obtain a full-field perspective view of the noise distribution in the substation noise emission area;

[0008] Obtain a perspective view of the noise distribution in the anechoic array region of the noise emission interface in the computer room from the perspective view of the full-field noise distribution;

[0009] The noise distribution perspective view of the anechoic array region is corrected by perspective transformation to obtain the noise distribution map of the anechoic array region.

[0010] The noise distribution map of the silencing array area is divided into grids corresponding to the active control silencer array to obtain the first grid; wherein, the active control silencer array is set in the noise emission area of ​​the substation and includes multiple silencing units arranged in the array. Each silencing unit includes a unit housing and a loudspeaker disposed within the unit housing. The noise reduction amplitude of each loudspeaker can be controlled individually; each first grid corresponds to one silencing unit, and the size of the first grid is adapted to the size of the silencing unit. All the first grids form the first grid array;

[0011] Each first grid in the first grid array is further divided into second grids, and all the second grids form a second grid array, with each first grid corresponding to a second grid array.

[0012] Determine the sound pressure level in each second grid, determine the sound pressure level of the first grid based on the sound pressure level of each second grid in the second grid array, and determine the control sound pressure level of the corresponding silencing unit based on the sound pressure level of the first grid;

[0013] The noise reduction is achieved by actively controlling the silencer array based on the control sound pressure level of the silencing unit.

[0014] As a further improvement of the present invention, the basic parameters of the active control muffler array, including the size of the active control muffler array and the maximum sound pressure level, are determined as follows:

[0015] Determine the noise information of the substation; wherein, the noise information includes the maximum sound pressure level of the equipment in the equipment room and the size of the noise emission interface in the equipment room;

[0016] The maximum sound pressure level of the loudspeaker is determined based on the maximum sound pressure level of the equipment in the computer room, so that the maximum sound pressure level of the loudspeaker is sufficient to suppress the noise of the substation.

[0017] The size of the active control silencer array is determined based on the size of the noise emission interface of the equipment room, so that the active control silencer array can cover the noise emission area of ​​the substation.

[0018] As a further improvement of the present invention, obtaining a full-field noise distribution perspective view of the substation noise emission area includes:

[0019] An acoustic imaging system is installed in the noise emission area of ​​the substation to obtain a full-field noise distribution perspective view of the substation noise emission area. The full-field noise distribution perspective view includes the noise emission interface of the equipment room, other non-equipment room noise emission interfaces, and the noise distribution map of the largest range that the entire acoustic imaging system can acquire.

[0020] As a further improvement of the present invention, a perspective transformation correction is performed on the perspective view of the noise distribution in the anechoic array region, including:

[0021] On the full-field noise distribution perspective view, select the deselection area noise distribution perspective view for the acoustic array region and delete the other areas;

[0022] The actual physical rectangle size of the noise emission interface in the computer room is scaled proportionally to obtain a scaled image.

[0023] The horizontal and vertical pixel counts are obtained from the scaled image, which are consistent with the aspect ratio of the actual physical rectangle size.

[0024] The perspective view of the noise distribution in the anechoic array region is corrected by perspective transformation based on the number of pixels in the horizontal and vertical directions.

[0025] As a further improvement of the present invention, the noise distribution map of the silencing array region is divided into a grid corresponding to the active control silencer array, including:

[0026] Determine the dimensions of the unit housing and the position of the speaker within the unit housing;

[0027] Generate a first mesh whose boundary dimensions match those of the unit shell;

[0028] Align the center of the first grid with the center of the speaker.

[0029] As a further improvement of the present invention, the acoustic imaging system acquires a full-field noise distribution perspective view of the substation noise emission area, including:

[0030] The acoustic imaging system acquires a full-field noise distribution perspective view of the substation noise emission area over various time periods; wherein the time periods include weekdays, rest days, peak electricity consumption, and off-peak periods.

[0031] As a further improvement of the present invention, the noise reduction is achieved by actively controlling the silencer array according to the control sound pressure level of the silencing unit, including:

[0032] Based on the full-field noise distribution perspective view of the noise emission area of ​​the substation at various time histories, the control sound pressure level of the silencer unit at each time histories is determined.

[0033] Based on the controlled sound pressure level of the silencer unit under each time history, the silencer array is actively controlled to reduce noise.

[0034] In a second aspect, the present invention provides an active control noise reduction device for substations, comprising:

[0035] The first acquisition module is used to acquire a full-field noise distribution perspective view of the substation noise emission area;

[0036] The second acquisition module is used to acquire a noise distribution perspective view of the silencing array region of the noise emission interface of the computer room from the full-field noise distribution perspective view;

[0037] The correction module is used to perform perspective transformation correction on the noise distribution perspective view of the anechoic array region to obtain a noise distribution map of the anechoic array region.

[0038] The first grid division module is used to divide the noise distribution map of the silencing array area into a grid corresponding to the active control silencer array to obtain a first grid; wherein, the active control silencer array is set in the noise emission area of ​​the substation and includes multiple silencing units arranged in an array. Each silencing unit includes a unit housing and a loudspeaker disposed within the unit housing. The noise reduction amplitude of each loudspeaker can be controlled individually; each first grid corresponds to one silencing unit, and the size of the first grid is adapted to the size of the silencing unit. All the first grids form a first grid array;

[0039] The second grid division module is used to further divide each first grid in the first grid array into second grids, and all the second grids form a second grid array, with each first grid corresponding to a second grid array.

[0040] The sound pressure level calculation module is used to determine the sound pressure level in each second grid, determine the sound pressure level of the first grid based on the sound pressure level of each second grid in the second grid array, and determine the control sound pressure level of the corresponding silencing unit based on the sound pressure level of the first grid.

[0041] The noise reduction control module is used to actively control the muffler array to reduce noise based on the control sound pressure level of the muffler unit.

[0042] In a third aspect, the present invention provides an electronic device including a processor and a memory, the processor being configured to execute a computer program stored in the memory to implement the substation active control noise reduction method as described above.

[0043] In a fourth aspect, the present invention provides a computer-readable storage medium storing at least one instruction that, when executed by a processor, implements the substation active control noise reduction method as described above.

[0044] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0045] The active noise reduction control method provided by this invention divides the noise distribution map of the silencing array region into a grid corresponding to the active control silencer array, obtaining a first grid. Each first grid corresponds to a silencing unit, and the size of the first grid is adapted to the size of the silencing unit. All the first grids form a first grid array. Each first grid in the first grid array is further divided into a second grid, and all the second grids form a second grid array. Each first grid corresponds to a second grid array. The sound pressure level in each second grid is determined, and the sound pressure level of the first grid is determined based on the sound pressure level of each second grid in the second grid array. The control sound pressure level of the corresponding silencing unit is determined by the sound pressure level of the first grid. The active control silencer array is controlled to reduce noise based on the control sound pressure level of the silencing unit. This scheme collects the noise distribution at the emission interface. Each silencing unit in the silencing array can be individually controlled to adjust the active noise reduction amplitude. According to the noise distribution at the noise emission interface, corresponding noise reduction effects can be adopted, and the noise emission of the corresponding area of ​​the noise reduction unit can be precisely adjusted to achieve fine noise reduction of the entire noise emission interface.

[0046] The active noise reduction control method provided by this invention determines the control sound pressure level of the silencer unit at each time period based on the full-field noise distribution perspective view of the noise emission area of ​​the substation at each time period, and controls the active control silencer array to reduce noise based on the control sound pressure level of the silencer unit at each time period. It is highly targeted and can adjust the loudspeaker to emit corresponding reverse sound waves according to the noise level generated during different power consumption periods, achieving real-time control. Attached Figure Description

[0047] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0048] Figure 1 This is a schematic diagram of a substation active control noise reduction method according to an embodiment of the present invention;

[0049] Figure 2 This is a simplified structural diagram of the active control muffler array in an embodiment of the present invention;

[0050] Figure 3 The following is an example diagram of noise distribution in an embodiment of the present invention; wherein, (a) represents a perspective view of noise distribution in the whole field, (b) represents a perspective view of noise distribution in the noise-canceling array region, and (c) represents a noise distribution diagram in the noise-canceling array region.

[0051] Figure 4 This is a schematic diagram of the noise emission interface in an embodiment of the present invention;

[0052] Figure 5This is an embodiment of the present invention. Figure 4 Enlarged view of point A in the image;

[0053] Figure 6 This is a schematic diagram of the second grid division in an embodiment of the present invention;

[0054] Figure 7 This is a structural block diagram of an active control noise reduction device for a substation according to an embodiment of the present invention;

[0055] Figure 8 This is a structural block diagram of an electronic device according to an embodiment of the present invention. Detailed Implementation

[0056] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0057] The following detailed description is exemplary and intended to provide further detailed explanation of the invention. Unless otherwise specified, all technical terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. The terminology used in this invention is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention.

[0058] Example 1

[0059] This solution provides an active noise reduction method for substations, which uses an active control silencer array to replace the perforated walls of the substation equipment room. At the same time, an acoustic imaging system is used to collect the distribution of noise at the emission interface. Each silencer unit in the active control silencer array can individually control the active noise reduction amplitude. According to different noise values ​​at the noise emission interface, corresponding noise reduction effects are adopted to achieve fine noise reduction of the entire noise emission interface.

[0060] like Figure 1 As shown, a substation active control noise reduction method includes the following steps:

[0061] S1. Obtain a full-field noise distribution perspective view of the substation noise emission area.

[0062] In one optional embodiment, obtaining a full-field noise distribution perspective view of the substation noise emission area includes:

[0063] An acoustic imaging system is installed in the noise emission area of ​​the substation to obtain a full-field noise distribution perspective view of the substation noise emission area. The full-field noise distribution perspective view includes the noise emission interface of the equipment room, other non-equipment room noise emission interfaces, and the noise distribution map of the largest range that the entire acoustic imaging system can acquire.

[0064] It should be noted that the image field of the acoustic imaging system in this solution can cover the noise emission interface of the computer room (i.e., the area where the silencer is installed). The full-field noise distribution perspective view obtained through the acoustic imaging system is shown below. Figure 3 As shown in (a).

[0065] S2. Obtain the noise distribution perspective view of the noise-absorbing array area of ​​the noise emission interface of the computer room from the full-field noise distribution perspective view.

[0066] In an optional embodiment, step S2 includes: selecting the four corner points of the noise distribution perspective view of the noise-canceling array region on the full-field noise distribution perspective view; deleting areas outside the noise distribution perspective view of the noise-canceling array region; and obtaining the noise distribution perspective view of the noise-canceling array region after deletion as shown in the figure. Figure 3 As shown in (b).

[0067] S3. Perform perspective transformation correction on the noise distribution perspective view of the noise-absorbing array area to obtain the noise distribution map of the noise-absorbing array area.

[0068] It should be noted that because substation equipment rooms are relatively tall, while acoustic imaging systems are often installed at a lower level, the obtained acoustic image distribution exhibits some perspective distortion. To eliminate this distortion, this solution also performs perspective transformation on the noise distribution perspective view of the anechoic array area, thereby obtaining an accurate noise distribution.

[0069] In one optional embodiment, perspective transformation correction is performed on the noise distribution perspective view of the anechoic array region, including:

[0070] Select the noise distribution perspective view of the anechoic array region on the full-field noise distribution perspective view and delete other regions; scale the actual physical rectangle size of the noise emission interface of the computer room proportionally to obtain a scaled image; obtain the horizontal and vertical pixel counts that are consistent with the aspect ratio of the actual physical rectangle size based on the scaled image; perform perspective transformation correction on the noise distribution perspective view of the anechoic array region based on the horizontal and vertical pixel counts, and the corrected result is as follows. Figure 3 As shown in (c).

[0071] As an example, if the noise emission interface is square, then the image output ratio is 1:1, and the output pixels can be 100×100, 1080×1080, etc., but not 100×200.

[0072] S4. The noise distribution map of the silencing array area is divided into grids corresponding to the active control silencer array to obtain the first grid; wherein, the active control silencer array is set in the noise emission area of ​​the substation and includes multiple silencing units arranged in the array. The silencing unit includes a unit housing and a loudspeaker set inside the unit housing. The noise reduction amplitude of each loudspeaker can be controlled individually; each first grid corresponds to one silencing unit. The size of the first grid is adapted to the size of the silencing unit, and all the first grids form the first grid array.

[0073] like Figure 2 The diagram shown is a simplified structural diagram of an active control silencer array. It consists of multiple silencer units stacked together to form a structure similar to a wall. Each silencer unit includes a unit housing and a loudspeaker.

[0074] like Figure 4 As shown, the noise generated by the noise source forms a noise emission interface, and an active control silencer array is set up at the noise emission interface to reduce noise, such as... Figure 5 As shown, each silencing unit reduces noise in a small area of ​​the noise emission interface.

[0075] In one optional embodiment, the noise distribution map of the anechoic array region is divided into a grid corresponding to the active control muffler array, including: determining the size of the unit housing and the position of the loudspeaker in the unit housing; generating a first grid with boundary dimensions matching the unit housing; and aligning the center of the first grid with the center of the loudspeaker.

[0076] In one optional embodiment, the basic parameters of the active control muffler array, including the size of the active control muffler array and the maximum sound pressure level, are determined as follows:

[0077] The noise information of the substation is determined; wherein the noise information includes the maximum sound pressure level of the equipment in the equipment room and the size of the noise emission interface of the equipment room; the maximum sound pressure level of the loudspeaker is determined based on the maximum sound pressure level of the equipment in the equipment room, so that the maximum sound pressure level of the loudspeaker is sufficient to suppress the noise of the substation; the size of the active control silencer array is determined based on the size of the noise emission interface of the equipment room, so that the active control silencer array can cover the noise emission area of ​​the substation.

[0078] It should be noted that the maximum sound pressure level of the equipment noise in this solution refers to the maximum noise sound pressure level Lmax generated under maximum load conditions, with the center frequency of the 1 / 3 octave band ranging from 31.5Hz, 40Hz, 50Hz, 63Hz, 80Hz, 100Hz, ... up to 1000Hz. The loudspeaker needs to be able to generate sufficiently high noise to suppress noise emissions; that is, its key parameter, the loudspeaker's maximum sound pressure level Lsmax, must satisfy:

[0079] The maximum sound pressure level of the loudspeaker, Lsmax, is greater than the maximum noise level emitted from the computer room, Lmax.

[0080] After selecting a suitable loudspeaker, design the unit size of the array-type active control muffler. The unit size needs to be large enough to accommodate the loudspeaker, and the distance between the inner boundary of the unit housing and the loudspeaker boundary should be at least 20mm.

[0081] As an example, the unit housing in this solution has dimensions of 200mm*200mm, and the speaker has a diameter of 100mm.

[0082] S5. Each first grid in the first grid array is further divided into second grids, and all the second grids form a second grid array, with each first grid corresponding to a second grid array.

[0083] It should be noted that the noise sound pressure level is not uniformly distributed within the coverage area of ​​each anechoic unit; that is, there are several different noise sound pressure level parameters within the entire anechoic unit area, but the loudspeaker can only use one sound pressure level parameter to suppress noise. To achieve precise noise control, each first grid is further divided into several second grids, such as at least 7×7 grids. The center of the grid located at the center of the 7×7 grid array needs to be directly aligned with the geometric center of the anechoic unit. Figure 6 As shown.

[0084] S6. Determine the sound pressure level in each second grid, determine the sound pressure level of the first grid based on the sound pressure level of each second grid in the second grid array, and determine the control sound pressure level of the corresponding silencing unit based on the sound pressure level of the first grid.

[0085] Taking the 7×7 grid in this scheme as an example, each Ns in the figure represents a second grid.

[0086] The sound pressure level in each second grid is calculated separately. The sound pressure levels of all 49 second grids under a first grid are added together and averaged to obtain the average sound pressure level of a silencing unit. The average sound pressure level is used as the control sound pressure level of the silencing unit.

[0087] S7. Based on the control sound pressure level of the silencing unit, actively control the silencer array to reduce noise.

[0088] Because the noise level of the noise source varies under different power loads, the load variation curves over time differ between weekdays and non-weekdays. Therefore, in a preferred embodiment, an acoustic imaging system is used to collect time-history sound pressure levels. Specifically, this includes: acquiring a full-field noise distribution perspective view of the substation noise emission area for each time history using the acoustic imaging system; wherein the time history includes weekdays, rest days, peak electricity consumption periods, and off-peak periods. Based on the full-field noise distribution perspective view of the substation noise emission area for each time history, the control sound pressure level of the silencer unit is determined for each time history; based on the control sound pressure level of the silencer unit for each time history, an active silencer array is controlled for noise reduction.

[0089] Specifically, data is collected over a period of at least one week to create an average sound pressure level history for each silencing unit, covering various time periods including weekdays and weekends, peak and off-peak electricity consumption. This creates a database for actual substation applications, including time periods and noise levels. The sound pressure levels emitted from the equipment room during each time period are then input into the active noise reduction control system, which actively controls the loudspeakers to play suppressed sound waves with identical sound pressure levels for the corresponding time periods.

[0090] In a preferred embodiment, the method further includes a step of performing secondary detection using an acoustic imaging system, specifically including:

[0091] Using an acoustic imaging system, the noise emission surface was measured again after the playback suppression was enabled. The acoustic image after noise reduction was checked, and adjustments were made to the noise-canceling units where noise was still noticeable. The speaker volume of the corresponding noise-canceling unit was adjusted until the noise emission after noise suppression was satisfactory.

[0092] Example 2

[0093] like Figure 7 As shown, based on the same inventive concept as the above embodiments, the present invention also provides a substation active control noise reduction device, comprising:

[0094] The first acquisition module is used to acquire a full-field noise distribution perspective view of the substation noise emission area;

[0095] The second acquisition module is used to acquire a noise distribution perspective view of the silencing array region of the noise emission interface of the computer room from the full-field noise distribution perspective view;

[0096] The correction module is used to perform perspective transformation correction on the noise distribution perspective view of the anechoic array region to obtain a noise distribution map of the anechoic array region.

[0097] The first grid division module is used to divide the noise distribution map of the silencing array area into a grid corresponding to the active control silencer array to obtain a first grid; wherein, the active control silencer array is set in the noise emission area of ​​the substation and includes multiple silencing units arranged in an array. Each silencing unit includes a unit housing and a loudspeaker disposed within the unit housing. The noise reduction amplitude of each loudspeaker can be controlled individually; each first grid corresponds to one silencing unit, and the size of the first grid is adapted to the size of the silencing unit. All the first grids form a first grid array;

[0098] The second grid division module is used to further divide each first grid in the first grid array into second grids, and all the second grids form a second grid array, with each first grid corresponding to a second grid array.

[0099] The sound pressure level calculation module is used to determine the sound pressure level in each second grid, determine the sound pressure level of the first grid based on the sound pressure level of each second grid in the second grid array, and determine the control sound pressure level of the corresponding silencing unit based on the sound pressure level of the first grid.

[0100] The noise reduction control module is used to actively control the muffler array to reduce noise based on the control sound pressure level of the muffler unit.

[0101] Example 3

[0102] like Figure 8 As shown, the present invention also provides an electronic device 100 for implementing a substation active control noise reduction method according to Embodiment 1; the electronic device 100 includes a memory 101, at least one processor 102, a computer program 103 stored in the memory 101 and executable on at least one processor 102, and at least one communication bus 104.

[0103] The memory 101 can be used to store computer program 103. The processor 102 implements the steps of the active control noise reduction method for substations in Embodiment 1 by running or executing the computer program stored in the memory 101 and calling the data stored in the memory 101.

[0104] The memory 101 may primarily include a program storage area and a data storage area. The program storage area may store the operating system, application programs required for at least one function (such as sound playback function, image playback function, etc.), etc.; the data storage area may store data created based on the use of the electronic device 100 (such as audio data), etc. In addition, the memory 101 may include non-volatile memory, such as hard disk, RAM, plug-in hard disk, smart media card (SMC), secure digital (SD) card, flash card, at least one disk storage device, flash memory device, or other non-volatile solid-state storage device.

[0105] At least one processor 102 may be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. Processor 102 may be a microprocessor or any conventional processor. Processor 102 is the control center of electronic device 100, connecting various parts of electronic device 100 via various interfaces and lines.

[0106] The memory 101 in the electronic device 100 stores multiple instructions to implement an active control noise reduction method for a substation, and the processor 102 can execute multiple instructions to achieve the following:

[0107] Obtain a full-field perspective view of the noise distribution in the substation noise emission area;

[0108] Obtain a perspective view of the noise distribution in the anechoic array region of the noise emission interface in the computer room from the perspective view of the full-field noise distribution;

[0109] The noise distribution perspective view of the anechoic array region is corrected by perspective transformation to obtain the noise distribution map of the anechoic array region.

[0110] The noise distribution map of the silencing array area is divided into grids corresponding to the active control silencer array to obtain the first grid; wherein, the active control silencer array is set in the noise emission area of ​​the substation and includes multiple silencing units arranged in the array. Each silencing unit includes a unit housing and a loudspeaker disposed within the unit housing. The noise reduction amplitude of each loudspeaker can be controlled individually; each first grid corresponds to one silencing unit, and the size of the first grid is adapted to the size of the silencing unit. All the first grids form the first grid array;

[0111] Each first grid in the first grid array is further divided into second grids, and all the second grids form a second grid array, with each first grid corresponding to a second grid array.

[0112] Determine the sound pressure level in each second grid, determine the sound pressure level of the first grid based on the sound pressure level of each second grid in the second grid array, and determine the control sound pressure level of the corresponding silencing unit based on the sound pressure level of the first grid;

[0113] The noise reduction is achieved by actively controlling the silencer array based on the control sound pressure level of the silencing unit.

[0114] Example 4

[0115] If the modules / units integrated in the electronic device 100 are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the methods of the above embodiments of the present invention can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include: any entity or device capable of carrying computer program code, recording media, USB flash drives, portable hard drives, magnetic disks, optical disks, computer memory, and read-only memory (ROM).

[0116] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0117] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0118] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0119] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0120] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," 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 the invention. In this specification, 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.

[0121] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for active noise reduction in substations, characterized in that, Includes the following steps: Obtain a full-field perspective view of the noise distribution in the substation noise emission area; Obtain a perspective view of the noise distribution in the anechoic array region of the noise emission interface in the computer room from the perspective view of the full-field noise distribution; The noise distribution perspective view of the anechoic array region is corrected by perspective transformation to obtain the noise distribution map of the anechoic array region. The noise distribution map of the silencing array area is divided into grids corresponding to the active control silencer array to obtain the first grid; wherein, the active control silencer array is set in the noise emission area of ​​the substation and includes multiple silencing units arranged in the array. Each silencing unit includes a unit housing and a loudspeaker disposed within the unit housing. The noise reduction amplitude of each loudspeaker can be controlled individually; each first grid corresponds to one silencing unit, and the size of the first grid is adapted to the size of the silencing unit. All the first grids form the first grid array; Each first grid in the first grid array is further divided into second grids, and all the second grids form a second grid array, with each first grid corresponding to a second grid array. Determine the sound pressure level in each second grid, determine the sound pressure level of the first grid based on the sound pressure level of each second grid in the second grid array, and determine the control sound pressure level of the corresponding silencing unit based on the sound pressure level of the first grid; The noise reduction is achieved by actively controlling the silencer array based on the control sound pressure level of the silencing unit. Obtaining a full-field noise distribution perspective view of a substation noise emission area includes: setting up an acoustic imaging system in the substation noise emission area, and obtaining a full-field noise distribution perspective view of the substation noise emission area through the acoustic imaging system; wherein, the full-field noise distribution perspective view includes: the noise emission interface of the equipment room, other non-equipment room noise emission interfaces, and the noise distribution map of the largest range that the entire acoustic imaging system can obtain; Obtaining a full-field noise distribution perspective view of the substation noise emission area through the acoustic imaging system includes: obtaining full-field noise distribution perspective views of the substation noise emission area at various time histories through the acoustic imaging system; wherein, the time histories include weekdays, rest days, peak electricity consumption and off-peak hours.

2. The active control noise reduction method for substations according to claim 1, characterized in that, The basic parameters of the active control muffler array include the size of the active control muffler array and the maximum sound pressure level, which are determined as follows: Determine the noise information of the substation; wherein, the noise information includes the maximum sound pressure level of the equipment in the equipment room and the size of the noise emission interface in the equipment room; The maximum sound pressure level of the loudspeaker is determined based on the maximum sound pressure level of the equipment in the computer room, so that the maximum sound pressure level of the loudspeaker is sufficient to suppress the noise of the substation. The size of the active control silencer array is determined based on the size of the noise emission interface of the equipment room, so that the active control silencer array can cover the noise emission area of ​​the substation.

3. The active control noise reduction method for substations according to claim 2, characterized in that, The perspective transformation correction of the noise distribution perspective view of the anechoic array region includes: On the full-field noise distribution perspective view, select the deselection area noise distribution perspective view for the acoustic array region and delete the other areas; The actual physical rectangle size of the noise emission interface in the computer room is scaled proportionally to obtain a scaled image. The horizontal and vertical pixel counts are obtained from the scaled image, which are consistent with the aspect ratio of the actual physical rectangle size. The perspective view of the noise distribution in the anechoic array region is corrected by perspective transformation based on the number of pixels in the horizontal and vertical directions.

4. The active control noise reduction method for substations according to claim 1, characterized in that, The noise distribution map of the silencing array region is divided into grids corresponding to the active control silencer array, including: Determine the dimensions of the unit housing and the position of the speaker within the unit housing; Generate a first mesh whose boundary dimensions match those of the unit shell; Align the center of the first grid with the center of the speaker.

5. The active control noise reduction method for substations according to claim 1, characterized in that, The noise reduction is achieved by actively controlling the silencer array according to the control sound pressure level of the silencing unit, including: Based on the full-field noise distribution perspective view of the noise emission area of ​​the substation at various time histories, the control sound pressure level of the silencing unit at each time histories is determined. Based on the controlled sound pressure level of the silencer unit under each time history, the silencer array is actively controlled to reduce noise.

6. A substation active control noise reduction device, used to implement the substation active control noise reduction method as described in claim 1, characterized in that, include: The first acquisition module is used to acquire a full-field noise distribution perspective view of the substation noise emission area; The second acquisition module is used to acquire a noise distribution perspective view of the silencing array region of the noise emission interface of the computer room from the full-field noise distribution perspective view; The correction module is used to perform perspective transformation correction on the noise distribution perspective view of the anechoic array region to obtain a noise distribution map of the anechoic array region. The first grid division module is used to divide the noise distribution map of the silencing array area into a grid corresponding to the active control silencer array to obtain a first grid; wherein, the active control silencer array is set in the noise emission area of ​​the substation and includes multiple silencing units arranged in an array. Each silencing unit includes a unit housing and a loudspeaker disposed within the unit housing. The noise reduction amplitude of each loudspeaker can be controlled individually; each first grid corresponds to one silencing unit, and the size of the first grid is adapted to the size of the silencing unit. All the first grids form a first grid array; The second grid division module is used to further divide each first grid in the first grid array into second grids, and all the second grids form a second grid array, with each first grid corresponding to a second grid array. The sound pressure level calculation module is used to determine the sound pressure level in each second grid, determine the sound pressure level of the first grid based on the sound pressure level of each second grid in the second grid array, and determine the control sound pressure level of the corresponding silencing unit based on the sound pressure level of the first grid. The noise reduction control module is used to actively control the muffler array to reduce noise based on the control sound pressure level of the muffler unit.

7. An electronic device, characterized in that, It includes a processor and a memory, the processor being used to execute a computer program stored in the memory to implement the substation active control noise reduction method as described in any one of claims 1 to 5.

8. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores at least one instruction, which, when executed by a processor, implements the substation active control noise reduction method as described in any one of claims 1 to 5.

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