CN102208263A - Multi-channel active noise control system for power transformer - Google Patents
Multi-channel active noise control system for power transformer Download PDFInfo
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Abstract
The invention discloses a multi-channel active noise control system for a power transformer. The system comprises a microphone, a control source and a multi-channel periodic noise self-adaptive active controller, can separately or simultaneously reduce the components approximate to 100Hz, 200Hz and 300Hz in noises of the power transformer and has high degree of automation and a good noise reduction effect. Compared with the noise reduction method of the traditional transformer, the system has a good noise reduction effect on the noise peak approximate to 100Hz, 200Hz and 300Hz; under an ideal condition, the magnitude order of the environmental noise can be reduced to at the microphone; the system manages the input and output of signals in a distributed manner by using a signal condition/a driving module, has good passageway expansibility and is convenient to realize and maintain; and in addition, the multi-channel active noise control system is less affected by the installation space of the field and is beneficial to the ventilation and heat dispersion of the power transformer.
Description
One, technical field
The present invention relates to a kind of noise control system, relate in particular to a kind of multi-channel active control system of power transformer noise.
Two, background technology
Power transformer is to utilize electromagnetic induction principle to change the device of alternating voltage, is mainly used in the ascending, descending voltage of electrical power trans mission/distribution system.The power transformer noise is mainly derived from iron core, unshakable in one's determination flexible under the flux interaction of alternation, magnetostriction makes unshakable in one's determination the variation with excitation frequency do periodic vibration, the frequency spectrum characteristic of the noise that produces is the line spectrum based on low frequency, frequency is the even number frequency multiplication relation of power frequency 50Hz, mainly concentrate on 100Hz, 200Hz is near the 300Hz.
The noise reduction measure of power transformer mainly can be divided into noise source control and the control of noise transmission path (Yu Xingbang etc., noise of transformer and reduction thereof, noise and vibration control, 5,35-38,2001; All virtuous soil, middle-size and small-size transformer noise (descending), 43 (12), 1-6,2006; Surplus You Hao etc., the noise analysis of large-scale power transformer and control, 44 (6), 23-26,2007; Tan hears, Zhang Xiaowu, the research of power transformer noise and control, High-Voltage Electrical Appliances, 45 (2), 70-76,2009).Noise source control mainly reduces this bulk noise of transformer (Ji Qing, transformer noise analysis and improvement measure, agricultural equipment technology, 36 (3), 46-48,2010) by structural design, type selecting layout, the production technology of adjusting members such as unshakable in one's determination and fuel tank.The power transformer professional standard that adopts is " JB/T 10088-20046KV～500KV level power transformer sound level " at present.The existing means of noise transmission path control are to add sound insulation, absorbent treatment in the power transformer periphery, when being reflected back, the partial noise of transformer body radiation absorbs some noises by sound-absorbing material, playing the reduction noise contributions (just checks and gives birth, Xin Jie Kou substation transformer noise control, noise and vibration control, 3,32-35,1990; Zhang Zhimin, transformer noise control technology and equipment, Chinese environmental protection industry, 6,50-52,2010; Kang Ligang is every the application of absorbent lined barrier in transformer noise control, Chinese environmental protection industry, 7,34-36,2010).For the noise that effective shielded transformer sends, it is totally enclosed often requiring sound insulation, absorbent treatment, can bring the problem of transformer ventilation and heat.Existing solution is the air inlet that certain area is set, and fixes a silencer at air inlet, but can cause the consequence of low-frequency noise control poor effect.Have only in this case by thickening sound insulation, absorbent treatment, the lengthening muffler solves, and under some field condition, surrounding space is had relatively high expectations to equipment volume, can't improve defening effect thereby so just can't increase equipment volume.Therefore, this shortcoming that class use is insulated against sound, absorbent treatment carries out the power transformer noise control technique is: 1, to transformer low-frequency noise control poor effect; 2, result of ventilating heat dissipation is good and be subjected to the restriction of installing space on every side in actual use.
The development of modern electronic technology, signal processing, control theory and transducer technology makes active noise control system be widely used in field of noise control.Practical at present active guidance system comprises: the Active noise control using in Active noise control using, aircraft and the car cabin in active antinoise earmuff, the pipeline and the active noise control system of hydraulic pump.At the active control of transformer noise, some researchs have been arranged both at home and abroad.Inertia vibration generator (X.Liet al..Tuneable inertial shakers for active control is being proposed aspect the active Controlling Source of transformer noise, International Journal of Acoustics and Vibration, 6 (4), 180-184,2001); Waveform composition algorithm (X.Qiu et al. is being proposed aspect the transformer noise ACTIVE CONTROL algorithm, Analgorithm for active control of transformer noise with on-line cancellation path modeling based onthe perturbation method, Journal of Sound and vibration, 240 (4), 647-665,2001; X.Qiu et al., Awaveform synthesis algorithm for active control of transformer noise:implementation, AppliedAcoustics, 63,467-479,2003); Though existing scholar has proposed distribution transformer noise active guidance system (the P.Micheau et al based on single channel FEEDBACK CONTROL control unit, Implementation of decentralized active control of powertransformer noise, First European Forum on Materials and Methods for Machinery andTransportation Noise Control, 2001), but exist following shortcoming: 1, adopt FEEDBACK CONTROL can produce water bed effect, when reducing some frequency component noise, can cause the rising of other a part of frequency place noise; 2, corresponding to the clear and definite noise source of this class of transformer, the noise reduction of FEEDBACK CONTROL is lower than the feedforward control system that adopts reference signal; 3, this system's employing adaptive algorithm is the X-LMS algorithm of standard, amount of calculation is bigger, under present state-of-art, is merely able to realize based on single pass distributed system, be difficult to realize multi-channel system, its noise control effect is lower than multichannel active guidance system.
At present, do not retrieve the introduction of the multi-channel active control system of disclosed power transformer, the invention discloses a kind of like this system, its innovation part is: 1, the signal conditioning device of error microphone and secondary sound source driver module are corresponding one by one, the shared cabinet of tetrad, constitute signal conditioning/driver module, organize signal conditioning/driver module more and constitute multi-channel active control system front end; 2, the Adaptive Signal Processing module adopts digital signal processing chip, constitute cabinet separately, the error signal input interface all links to each other with signal conditioning/driver module by holding wire with the control signal output interface, and the reference signal input interface can link to each other with signal conditioning/driver module also can directly be connected the reference signal transducer; 3, human-computer interaction module uses computer touch screen display control panel and receiving management person's operation, by serial ports and Adaptive Signal Processing module swap data.
Three, summary of the invention
1, goal of the invention: the object of the present invention is to provide the control of a kind of low frequency spectrum lines component effective, be subjected to the power transformer noise control system that the installing space condition influence is little, help ventilation and heat.
2, technical scheme:
For achieving the above object, power transformer noise multi-channel active control system of the present invention comprises microphone 1, Controlling Source 2, reference signal transducer 3 and control desk 4, microphone 1, Controlling Source 2 and reference signal transducer 3 all are connected with control desk 4, and the physics of system lays schematic diagram as shown in Figure 1.Wherein control desk 4 is made of signal conditioning/driver module 5, multichannel periodic noise self-adaptive control module 6, human-computer interaction module 7, and the structural representation of control desk is seen Fig. 2.Reference signal transducer 3 is installed in transformer 8 surfaces, microphone 1 and Controlling Source 2 cloth be placed on transformer 8 around and the top.Especially, Controlling Source 2 should suitably be pressed close to transformer 8 installations, and distance is near more, and native system is good more to the control effect of the low frequency spectrum lines component of noise.
The reference signal transducer can adopt accelerometer, also can adopt microphone or electromagnetic induction coil.
Microphone can adopt electret microphone, and can transform according to field condition.
Controlling Source can adopt loud speaker, also can adopt vibration generator, electromagnetic driver.Controlling Source can adopt special design, makes it in the frequency response at 100Hz, 200Hz, the 300Hz place response far above other frequency place.
Microphone, Controlling Source, reference signal transducer all are connected to signal conditioning/driver module, carry out exchanges data (especially, the reference signal transducer also can be directly connected to multichannel periodic noise self-adaptive control module) by signal conditioning/driver module is unified with multichannel periodic noise self-adaptive control module.
The cabinet panel schematic diagram of individual signals condition/driver module as shown in Figure 3, each signal conditioning/driver module is responsible for the signal of telecommunication of four-way and is handled, wherein each passage is independently-powered, but signal conditioning and signal drive part common board.The signal of telecommunication of each paths is handled and comprised that signal conditioning and signal drive two aspects, and is corresponding one by one.Signal conditioning is the correctness that detects the signal that microphone and reference signal sensor acquisition arrive, height according to signal amplitude is divided into it faint/normal/overload third gear, the color of the signal conditioning device input state lamp by front panel shows gear, to the normal signal of telecommunication of amplitude amplify with low-pass filtering treatment after export multichannel periodic noise self-adaptive control module to, use on the front panel signal conditioning device gain-adjusted knob can the conversion amplification coefficient; It is the output that detects multichannel periodic noise self-adaptive control module that signal drives, and equally its signal is carried out stepping by amplitude, to the normal signal of amplitude amplify, reconstruct Filtering Processing rear drive Controlling Source.Similarly, the input range of signal drive circuit can pass through the status lamp demonstration of the case front panel of signal conditioning/driver module, and multiplication factor can be used gain knob adjustment.Therefore every road signal of telecommunication is handled and is comprised four interfaces, and signal conditioning input interface, signal conditioning output interface, signal drive input interface, and signal drives output interface.Wherein the signal conditioning input interface connects microphone or reference signal transducer, the signal conditioning output interface connects the input of multichannel periodic noise self-adaptive control module, signal drives the output that input interface connects multichannel periodic noise self-adaptive control module, and signal drives output interface and connects Controlling Source.
The interface of each signal conditioning/driver module divides four groups by passage, amounts to 16 interfaces, specifically sees the schematic diagram of cabinet rear board among Fig. 3.With every paths signal of telecommunication all independent process compare, the signal conditioning of four-way/driver module integrated level height, common board and shell can be saved cost, reduce the space, can also reduce the number of the required power cable of whole system when being convenient to actual installation; Compare with the centralized and unified processing of all passage signals of telecommunication, the signal conditioning of four-way/driver module complexity is low, can not influence the operate as normal of other passages after certain module damage, the stability that helps system works, only need replace the module of having damaged during maintenance, convenient and swift, can increase or reduce the number of signal conditioning/driver module in addition as required, be convenient to the port number of expanding system.
Multichannel periodic noise self-adaptive control module comprises the individual interface of 2 (n+1), wherein n is the port number of power transformer noise active guidance system, each passage comprises two interfaces of input and output, two other interface is respectively the communication interface of reference signal interface and human-computer interaction module, specifically sees cabinet rear board schematic diagram among Fig. 4.The running status of the state of input signal, digital signal processing chip hardware and the software operation state of adaptive control algorithm show on case front panel, button also is set on the front panel in addition, can direct under specific circumstances control figure signal processing chip.The main task of multichannel periodic noise self-adaptive control module is to receive the instruction that human-computer interaction module sends, the signal that the reference signal transducer is picked up (handle the back or directly insert through signal conditioning/driver module) carries out shaping and synthesizes, the adaptive algorithm of cycle of operation noise is also exported control signal, realizes the modeling and the controlled function of the active control of noise.Multichannel periodic noise self-adaptive control module can receive the instruction and the parameter of human-computer interaction module according to the priority of setting, the change operating state in real time in program operation process.Need in addition by the time interval of setting, the related data of each assembly operating state of whole system is sent to human-computer interaction module.
Human-computer interaction module adopts computer touch to shield and the mode receiving management person's that the keyboard and mouse input combines operation, the priority of decision operation, operation is converted into instruction and parameter is sent to multichannel periodic noise self-adaptive control module, controls whole power transformer noise multi-channel active control system by the operating state that changes multichannel periodic noise self-adaptive control module.In addition, human-computer interaction module can setting-up time at interval, receive and data that decoding multichannel periodic noise self-adaptive control module sends, adopt the mode of graphical interfaces, dynamically show the operating state of whole each assembly of power transformer noise multi-channel active control system.Be connected with the serial ports cable between human-computer interaction module and the multichannel periodic noise self-adaptive control module, carry out communication.
Power transformer noise multi-channel active control system of the present invention, at the power transformer noise mainly based on the characteristics of low frequency spectrum lines component, around the transformer and above lay that microphone obtains sound field information and via signal conditioning/driver module amplification filtering after, the signal that picks up with the reference signal transducer is feed-in multichannel periodic noise self-adaptive control module together, produce output signal by multichannel periodic noise self-adaptive control module, through signal conditioning/driver module rear drive Controlling Source work, reduce 100Hz separately or all, near the noise radiation of the line spectrum component 200Hz and the 300Hz.
3, beneficial effect: the present invention compared with prior art, its remarkable advantage is to be: near the low frequency spectrum lines noise component(s) control (1) 100Hz, 200Hz, the 300Hz is effective, the magnitude (2) that these line spectrum components can be reduced to ambient noise at the microphone place under the ideal conditions is used four-way signal conditioning/driver module distributed management signal input and output, the passage favorable expandability, the system of being convenient to realizes and to safeguard that (3) are influenced by on-the-spot installing space little, helps the ventilation and heat of power transformer.
Four, description of drawings
Fig. 1 is that the physics of transformer noise multi-channel active control system among the present invention lays schematic diagram, and is clear in order to represent, ignored the Controlling Source of transformer top;
Fig. 2 is the structural representation of control desk in the transformer noise multi-channel active control system among the present invention;
Fig. 3 is the cabinet front and back panel schematic diagram of 4 channel signal condition/driver modules among the present invention;
Fig. 4 is the cabinet front and back panel schematic diagram of multichannel periodic noise self-adaptive control module among the present invention;
Fig. 5 is a specific embodiment of the invention photo;
Fig. 6 is the cabinet front and back panel photo of signal conditioning/driver module in the specific embodiment of the invention;
Fig. 7 is the actual measurement noise reduction at 16 error microphone places in the specific embodiment of the invention.
Five, embodiment
Embodiment: the power transformer noise that control is measured,, then can be adopted the present invention if when tangible line spectrum component appears in its noise spectrum near 100Hz, 200Hz, 300Hz.
The sound field of at first measuring near power transformer noise line spectrum 100Hz, 200Hz, 300Hz distributes and definite noise reduction that need reach, then according to the data that measure with intend the number of the Controlling Source implemented, the position and the number of microphone and Controlling Source is optimized.Used optimization method can (the vertical outstanding person of instrument translates the ACTIVE CONTROL of noise and vibration, Science Press, 2002 referring to existing publication; Chen Kean, Ma Yuanliang, adaptive active noise control-principle, algorithm and realization, publishing house of Northwestern Polytechnical University, 1993).
As shown in Figure 5, the power transformer active noise control system of present embodiment, comprise microphone 1, Controlling Source 2, reference signal transducer 3 and control desk 4, microphone 1 and Controlling Source 2 are positioned at the top of transformer 8 and on every side, and reference signal transducer 3 is installed in transformer 8 surfaces.Microphone 1, Controlling Source 2 and reference signal transducer 3 all are connected with control desk 4.Wherein, control desk 4 is made of signal conditioning/driver module 5, multichannel periodic noise self-adaptive control module 6, human-computer interaction module 7.
Microphone adopts electret microphone, and number is 16 in this example, and sensitivity is 24mV/Pa, and cloth is placed on the outer side away from transformer 8 of enveloping surface that Controlling Source forms.
Controlling Source adopts loud speaker, and number is 16 in this example, is distributed on the top of transformer 8 and on every side.Loud speaker is that cuboid closes the case loud speaker, and rated power 60W, the face of casing installation unit are square, and the length of side is 23cm, and box height is 18cm.
The reference signal transducer adopts accelerometer, and sensitivity is 50mV/g, is installed in the surface of transformer, is connected directly to the multichannel periodic noise self-adaptive control module on the control desk.
Use 4 groups in this example of signal conditioning/driver module altogether, every pack module is responsible for the amplification filtering of 4 road microphone acquired signal and the driving of 4 tunnel Controlling Source, and is corresponding one by one.The amplitude of condition device input electrical signal is normal in 30～75mV scope, and corresponding indicator light shows green; It is faint being lower than 30mV, and indicator light does not work; Be higher than 75mV and be overload, indicator light shows red.Condition device maximum gain is 24dB.The normal scope of the amplitude of drive circuit input electrical signal is 20～500mV, and maximum gain is 26.5dB, and peak power output is 30W.
Multichannel periodic noise self-adaptive control module is made up of two digital signal panels, and processor host frequency is 450M Hz, and operational capability is 2700 MFLOPS, in save as 5Mb.This module has 17 tunnel inputs (16 route microphones are gathered through the error signal of signal conditioning/driver module and the reference signal of 1 tunnel reference signal sensor acquisition) and 16 outputs to drive 16 Controlling Source.Error signal input amplitude peak 2.8V, maximum dynamic range is 112dB, sample frequency is 48k Hz; The maximum input range of reference signal is 200mV; The amplitude peak of output signal is 2.8V.
Human-computer interaction module carries out exchanges data by serial ports and multichannel periodic noise self-adaptive control module.The keeper sends instruction by the control panel that the screen of the computer touch in the human-computer interaction module shows to multichannel periodic noise self-adaptive control module, power transformer active noise control system in the operation present embodiment, and observe the control effect.After the active noise control system unlatching work in the present embodiment, the noise control effect of 16 error microphone place actual measurements can find that the noise component(s) of 100Hz, 200Hz, 300Hz has all obtained reduction as shown in Figure 7, and noise reduction is all greater than 10dB.
Claims (6)
1. power transformer noise multi-channel active control system, it is characterized in that: this system comprises microphone (1), Controlling Source (2), reference signal transducer (3) and control desk (4), microphone (1) and Controlling Source (2) are positioned at the top of transformer (8) and on every side, reference signal transducer (3) is installed in transformer (8) surface, microphone (1), Controlling Source (2) all is connected with control desk (4) with reference signal transducer (3), and control desk (4) is by signal conditioning/driver module (5), multichannel periodic noise self-adaptive control module (6), human-computer interaction module (7) constitutes.
2. transformer noise multi-channel active control system according to claim 1, it is characterized in that reference signal transducer (3) for accelerometer, also can be electret microphone and electromagnetic induction coil, be installed in transformer (8) surface.
3. the structure of control desk (4) in the transformer noise multi-channel active control system according to claim 1 is characterized in that: signal conditioning/driver module (5) is responsible for the amplification filtering of error signal and control signal; Multichannel periodic noise self-adaptive control module (6) is responsible for receiving the instruction and the parameter of human-computer interaction module (7), changes operating state, and regularly sends the operating state data of each assembly; Human-computer interaction module (7) is responsible for receiving management person's operation and is sent to multichannel periodic noise self-adaptive control module (6), needs regularly dynamically to show the operating state of each assembly of transformer noise multi-channel active control system in addition.
4. the condition of the four-way signal of transformer noise multi-channel active control system according to claim 1/driving processing module (5), it is characterized in that: the signal conditioning device of error microphone and secondary sound source driver module are corresponding one by one, tetrad, many groups constitute multi-channel active control system front end.
5. the multichannel periodic noise self-adaptive control module (6) of transformer noise multi-channel active control system according to claim 1, it is characterized in that: adopt digital signal processing chip, constitute cabinet separately, the error signal input interface all links to each other with signal conditioning/driver module (5) by holding wire with the control signal output interface, and the reference signal input interface can link to each other with signal conditioning/driver module (5) also can directly be connected reference signal transducer (3).
6. the human-computer interaction module (7) of transformer noise multi-channel active control system according to claim 1, it is characterized in that: use computer touch screen display control panel and receiving management person's operation, by serial ports and Adaptive Signal Processing module swap data.
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102638750A (en) * | 2012-04-09 | 2012-08-15 | 南京大学 | Design method of loudspeaker for active noise control of power transformer |
| CN102969132A (en) * | 2012-11-26 | 2013-03-13 | 东南大学 | Near-field control active noise reduction system for oil-immersed amorphous alloy transformer |
| CN103475336A (en) * | 2013-09-06 | 2013-12-25 | 深圳供电局有限公司 | Power transformer noise control method based on inverse control technology |
| CN104103267A (en) * | 2014-06-19 | 2014-10-15 | 广东电网公司汕头供电局 | Virtual sound barrier applied to low frequency noise of transformer |
| CN104538017A (en) * | 2014-12-17 | 2015-04-22 | 武汉理工大学 | Transformer substation noise device based on active control |
| CN104916418A (en) * | 2015-06-25 | 2015-09-16 | 国网山东省电力公司莱芜供电公司 | Active noise control system and working method of power transformer |
| WO2015169109A1 (en) * | 2014-05-06 | 2015-11-12 | 国家电网公司 | A transformer noise suppression method |
| CN105139861A (en) * | 2015-08-24 | 2015-12-09 | 昆明科林科技工程有限公司 | Method and device for active noise reduction for industrial noise treatment |
| CN106910606A (en) * | 2017-04-18 | 2017-06-30 | 江西明正变电设备有限公司 | A kind of transformer active noise denoising device and control method |
| CN108309274A (en) * | 2018-03-09 | 2018-07-24 | 上海由泰医疗器械科技有限公司 | A kind of method that automatic detection obtains blood pressure Korotkoff's Sound |
| CN108897901A (en) * | 2018-03-29 | 2018-11-27 | 云南电网有限责任公司 | A kind of control method and system of indoor substation noise |
| CN111063528A (en) * | 2019-11-25 | 2020-04-24 | 深圳供电局有限公司 | Active noise reduction equipment of transformer and transformer noise on-line monitoring system |
| CN112540586A (en) * | 2020-12-07 | 2021-03-23 | 青岛理工大学 | Distributed sound vibration active control system based on star network |
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Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102638750A (en) * | 2012-04-09 | 2012-08-15 | 南京大学 | Design method of loudspeaker for active noise control of power transformer |
| CN102969132A (en) * | 2012-11-26 | 2013-03-13 | 东南大学 | Near-field control active noise reduction system for oil-immersed amorphous alloy transformer |
| CN102969132B (en) * | 2012-11-26 | 2015-11-18 | 东南大学 | A kind of active noise reduction system of oil-immersed type non-crystal alloy transformer of past near-field control |
| CN103475336A (en) * | 2013-09-06 | 2013-12-25 | 深圳供电局有限公司 | Power transformer noise control method based on inverse control technology |
| CN103475336B (en) * | 2013-09-06 | 2017-02-01 | 深圳供电局有限公司 | Power transformer noise control method based on inverse control technology |
| US10083709B2 (en) | 2014-05-06 | 2018-09-25 | State Grid Jiangsu Electric Power Company Nan Jing Power Supply Company | Transformer noise suppression method |
| WO2015169109A1 (en) * | 2014-05-06 | 2015-11-12 | 国家电网公司 | A transformer noise suppression method |
| CN104103267A (en) * | 2014-06-19 | 2014-10-15 | 广东电网公司汕头供电局 | Virtual sound barrier applied to low frequency noise of transformer |
| CN104538017A (en) * | 2014-12-17 | 2015-04-22 | 武汉理工大学 | Transformer substation noise device based on active control |
| CN104916418A (en) * | 2015-06-25 | 2015-09-16 | 国网山东省电力公司莱芜供电公司 | Active noise control system and working method of power transformer |
| CN105139861A (en) * | 2015-08-24 | 2015-12-09 | 昆明科林科技工程有限公司 | Method and device for active noise reduction for industrial noise treatment |
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| CN108309274A (en) * | 2018-03-09 | 2018-07-24 | 上海由泰医疗器械科技有限公司 | A kind of method that automatic detection obtains blood pressure Korotkoff's Sound |
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| CN111063528A (en) * | 2019-11-25 | 2020-04-24 | 深圳供电局有限公司 | Active noise reduction equipment of transformer and transformer noise on-line monitoring system |
| CN111063528B (en) * | 2019-11-25 | 2021-08-31 | 深圳供电局有限公司 | Active noise reduction equipment of transformer and transformer noise on-line monitoring system |
| CN112540586A (en) * | 2020-12-07 | 2021-03-23 | 青岛理工大学 | Distributed sound vibration active control system based on star network |
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