CN107272482A - Power capacitor noise control method based on Vibration Active Control - Google Patents
Power capacitor noise control method based on Vibration Active Control Download PDFInfo
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- CN107272482A CN107272482A CN201710411708.XA CN201710411708A CN107272482A CN 107272482 A CN107272482 A CN 107272482A CN 201710411708 A CN201710411708 A CN 201710411708A CN 107272482 A CN107272482 A CN 107272482A
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- 239000003990 capacitor Substances 0.000 title claims abstract description 43
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D19/00—Control of mechanical oscillations, e.g. of amplitude, of frequency, of phase
- G05D19/02—Control of mechanical oscillations, e.g. of amplitude, of frequency, of phase characterised by the use of electric means
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/21—Pc I-O input output
- G05B2219/21137—Analog to digital conversion, ADC, DAC
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- Soundproofing, Sound Blocking, And Sound Damping (AREA)
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Abstract
The invention discloses a kind of power capacitor noise control method based on Vibration Active Control, including m power capacitor, m acceleration transducer on each power capacitor, noise transducer are respectively arranged on, controller, is respectively arranged on m actuator on each power capacitor；Controller is electrically connected with each acceleration transducer, noise transducer and each actuator respectively.The present invention has strong adaptability, and construction is simple, the characteristics of damping, excellent noise reduction effect.
Description
Technical field
It is more particularly to a kind of to be based on active vibration control the present invention relates to the Noise Control technical field of power capacitor
The noise control method of the power capacitor of system.
Background technology
In recent years increasing high pressure, extra-high voltage direct-current transmission engineering are built, the electric power electricity in high voltage power transmission engineering
Container is that the visual plant with reactive-load compensation is filtered during direct current transportation, but capacitor device is produced in the course of work
Noise is an outstanding problem.People are chronically exposed under 85dB (A) noise circumstance can insulting auditory system and god
Through system, China Electric Power Research Institute and Henan Electric Power Test Inst once enter to the audible noise level in DC converter station
Went measurement, as a result showed：Noise level near wave filter is up to 89.7dB.Therefore, the audible noise of wave filter is dirty
Dye has become the problem of power transmission and transformation industry one is very important.
It is main at present to use in terms of capacitor noise administering method<1>Acoustical insulation sound-deadening noise reduction；<2>Vibration isolator passively subtracts
Shake noise reduction；<3>Current conversion station integral layout optimizes three kinds of noise reduction measures of noise reduction.
The content of the invention
The goal of the invention of the present invention is that noise reduction magnitude of the prior art is low, it is multiple to construct in order to overcome
Miscellaneous, noise reduction frequency range can not be adaptively not enough there is provided a kind of noise of the power capacitor based on Vibration Active Control
Control method.
To achieve these goals, the present invention uses following technical scheme：
A kind of power capacitor noise control method based on Vibration Active Control, including m power capacitor, set respectively
In m acceleration transducer on each power capacitor, noise transducer, controller is respectively arranged on each power capacitor
On m actuator；Controller is electrically connected with each acceleration transducer, noise transducer and each actuator respectively；Including
Following steps：
(1-1) each acceleration transducer gathers the vibration signal on power capacitor surface respectively, close to each electric power electricity
The noise transducer acquisition noise signal of container；
(1-2) controller detects the correlation of vibration and noise by coherent function, chooses damping component；
(1-3) controller carries out actuator transmission function identification to damping component；
(1-4) calculates active vibration damping drive signal；
(1-5) controller output m roads vibration reduction control signal arrives m actuator respectively；
(1-6) repeat step (1-1) to (1-3)；
(1-7) controller updates actuator transmission function；Return (1-4).
Traditional oscillation damping method can not change according to frequency, the magnitude of power capacitor self-noise radiation characteristic actively to be adjusted
, there is difficult design in the whole noise reduction strategies of itself, constructional difficulties, the features such as adaptability is not strong.
Active actuator is installed on power capacitor shell by the present invention, is carried out by the Algorithm of Active Control of controller
Exert oneself decision-making, the vibration equal, in opposite direction with original vibration of output amplitude, so as to reduce the vibration level of power capacitor, reaches
To the purpose of active vibration noise reduction.
<1>Vibration and noise signal that sensor collection power capacitor is produced, by signal wire by the vibration of capacitor
Noise signal is sent to controller.
<2>Controller is a set of measurement that can meet Algorithm of Active Control requirement and control device, by DSP and corresponding signal
Conditioning, AD conversion, DA conversions, memory cell composition.It is used as the bogey of the algorithm of active control.
<3>Active control strategies refer to that desired vibration and noise are zero, root according to the residual vibration and noise collected
The vibratory output for needing to export is calculated according to corresponding strategy, actuator is output to by the DA of controller, so as to offset electric capacitor
The vibration that device excitation is produced.
<4>Actuator：Receive the control signal of controller, export the vibration opposite with capacitor excitation orientation, realization is shaken
Dynamic active control.
The noise excitation of power capacitor is usually the frequency-doubled signal of power frequency, usually below 60 ranks, no more than 30 points
Amount causes, in order to realize the Noise measarement to power capacitor.
Preferably, step (1-1) comprises the following steps：
(101) m is 5, and controller is with 12.8kHz sample frequency, the vibration signal of 5 acceleration transducers of continuous acquisition
A (n), b (n), c (n), d (n), e (n) and noise transducer noise signal s (n)；
(102) controller is carried out fast using 4096 points as data length to a (n), b (n), c (n), d (n), e (n) and s (n)
Fast Fourier transformation, respectively obtains Fa (n), Fb (n), Fc (n), Fd (n), Fe (n), Fs (n)；
(103) controller calculates Fa (n), Fb (n), Fc (n), Fd (n), Fe (n), Fs (n) auto-power spectrum Ga respectively
(n), Gb (n), Gc (n), Gd (n), Ge (n), Gs (n)；By Fa (n), Fb (n), Fc (n), Fd (n), Fe (n) respectively with Fs (n)
Crosspower spectrum is calculated, Gas (n), Gbs (n), Gcs (n), Gds (n), Ges (n) is obtained；
(104) controller each auto-power spectrum and each crosspower spectrum are carried out no less than average for 8 it is linear flat
；
(105) 30 frequency components of vibration signal amplitude maximum are marked controller.
Preferably, the step (1-2) comprises the following steps：
(201) controller calculates vibration signal a (n) and noise signal s (n) coherent signal, obtains coherent signal Coha
(n),
Vibration signal b (n) and noise signal s (n) coherent signal are calculated, coherent signal Cohb (n) is obtained；
Vibration signal c (n) and noise signal s (n) coherent signal are calculated, coherent signal Cohc (n) is obtained；
Vibration signal d (n) and noise signal s (n) coherent signal are calculated, coherent signal Cohd (n) is obtained；
Vibration signal e (n) and noise signal s (n) coherent signal are calculated, coherent signal Cohe (n) is obtained；
(202) controller checks x, y, the coefficient of z correspondence coherent functions, by 30 according to the frequency marker of step (105)
The frequency component that coefficient in frequency component is less than 0.5 is removed, and remaining frequency component is subtracting for obtaining in 30 frequency components
Shake component.
Preferably, the step (1-3) comprises the following steps：
(301) controller records vibration signal Ga (n), Gb (n), Gc (n), Gd (n), Ge (n), Gs before identification starts respectively
(n)；
(302) controller is controlled according to the rate-adaptive pacemaker actuator of mark, and causes Ga (n), Gb (n), Gc (n), Gd
(n), Ge (n) and Gs (n) is controlled in 20%+/- 3% in control frequency vibration amplitude change；
(303) controller calculates biography of the control signal to actuator according to rate of change and drive signal amplitude size variation
Delivery function.
Preferably, the step (1-4) comprises the following steps：
(401) controller is using 12.8k as sample rate, the closed loop cycle that every 4 sampled points drive as a vibration damping, five
Vibration signal is defined as Ga (n), Gb (n), Gc (n), Gd (n), Ge (n), Gs (n) respectively；
(402) controller judges at Ga (n), Gb (n), Gc (n), Gd (n), Ge (n), Gs (n) correspondence damping components respectively
The amplitude and phase of current demand signal；
(403) controller is generated respectively needs the target vibration damping signal of damping, and target vibration damping signal is multiplied by transmission function, raw
Into drive signal Da (n), Db (n), Dc (n), Dd (n) and De (n).
Preferably, the step (1-5) comprises the following steps：
(501) controller enters row interpolation filter to the drive signal Da (n) of output, Db (n), Dc (n), Dd (n) and De (n)
Ripple, so as to meet the requirement of hardware DA actual output frequencies；
(502) each drive signal is converted to analog signal by controller by DA, and is defeated by actuator as an electrical current.
Therefore, the present invention has the advantages that：Strong adaptability, construction is simple, damping, excellent noise reduction effect.
Brief description of the drawings
Fig. 1 is a kind of theory diagram of the present invention；
Fig. 2 is a kind of flow chart of the present invention.
In figure：Power capacitor 1, acceleration transducer 2, noise transducer 3, controller 4, actuator 5.
Embodiment
The present invention will be further described with reference to the accompanying drawings and detailed description.
Embodiment as shown in Figure 1 is a kind of power capacitor noise control method based on Vibration Active Control, including
12 power capacitors 1, are respectively arranged on 12 acceleration transducers 2 on each power capacitor, noise transducer 3, control
Device 4, is respectively arranged on 12 actuator 5 on each power capacitor；Controller is passed with each acceleration transducer, noise respectively
Sensor and each actuator are electrically connected；As shown in Fig. 2 comprising the following steps：
Step 100, each acceleration transducer gathers the vibration signal on power capacitor surface respectively, close to each electric power
The noise transducer acquisition noise signal of capacitor；
Step 200, controller detects the correlation of vibration and noise by coherent function, chooses damping component；
Step 300, controller carries out actuator transmission function identification to damping component；
Step 400, active vibration damping drive signal is calculated；
Step 500, controller output m roads vibration reduction control signal arrives m actuator respectively；
Step 600, repeat step 100 to 300；
Step 700, controller updates actuator transmission function；Return to 400.
The noise reduction schemes iteration optimization of the present invention, is that noise reduction before is further evaluated, and is passed by adjusting
The methods such as delivery function, further refine control process.
Step 100 comprises the following steps：
<101>Controller is with 12.8kHz sample frequency, the vibration signal in five faces of continuous acquisition, a (n), b (n), c
(n), d (n), e (n) and noise signal s (n)；
<102>Controller is carried out using 4096 points as data length to a (n) collected, b (n), c (n), d (n), e (n)
Fast Fourier Transform (FFT) (FFT), respectively obtains Fa (n), Fb (n), Fc (n), Fd (n), Fe (n), Fs (n)；
FFT calculation formula are：
<103>Controller calculates Fa (n), Fb (n), Fc (n), Fd (n), Fe (n), Fs (n) auto-power spectrum Ga respectively
(n), Gb (n), Gc (n), Gd (n), Ge (n), Gs (n)；Fa (n), Fb (n), Fc (n), Fd (n), Fe (n) are counted with Fs (n) respectively
Crosspower spectrum is calculated, Gas (n), Gbs (n), Gcs (n), Gds (n), Ges (n) is respectively obtained；
Auto-power spectrum formula is：
Crosspower spectrum formula is：
Explanation：FxSignal x FFT is represented,It is FxConjugation.
<104>Each auto-power spectrum and each crosspower spectrum are carried out no less than the linear averaging that average is 8；
<105>30 frequency components to vibration signal amplitude maximum are marked.
Step 200 comprises the following steps：
<201>Controller calculates vibration signal a (n) and noise signal s (n) coherent signal, obtains coherent signal Coha
(n),
Vibration signal b (n) and noise signal s (n) coherent signal are calculated, coherent signal Cohb (n) is obtained,
Vibration signal c (n) and noise signal s (n) coherent signal are calculated, coherent signal Cohc (n) is obtained,
Vibration signal d (n) and noise signal s (n) coherent signal are calculated, coherent signal Cohd (n) is obtained,
Vibration signal e (n) and noise signal s (n) coherent signal are calculated, coherent signal Cohe (n) is obtained；Coherent signal
Calculation formula be：
The value of coherent function represents that signal correlation is higher, i.e. response signal and reference signal between 0-1 closer to 1
Relevance it is higher, only the high part of correlation just can according to the present invention carry out Noise measarement.
<202>According to 105 frequency marker, x, y, the coefficient of z correspondence coherent functions, by 30 frequency components are checked
The frequency component that coefficient is less than 0.5 is removed, and remaining frequency component is the damping component obtained in 30 frequency components.
Step 300 comprises the following steps：
<301>Controller records vibration signal Ga (n), Gb (n), Gc (n), Gd (n), Ge (n) before identification starts respectively,
Gs(n)。
<302>Controlled according to the rate-adaptive pacemaker actuator of mark, and cause Ga (n), Gb (n), Gc (n), Gd (n), Ge
(n), Gs (n) is controlled in 20%+/- 3% in control frequency vibration amplitude change.
<303>According to rate of change and drive signal amplitude size variation, transmission function of the control signal to actuator is calculated.
Step 400 comprises the following steps：
<401>Controller is using 12.8k as sample rate, the closed loop cycle that every 4 sampled points drive as a vibration damping, five
Vibration signal is defined as Ga (n), Gb (n), Gc (n), Gd (n), Ge (n), Gs (n) respectively.
<402>Judge respectively at Ga (n), Gb (n), Gc (n), Gd (n), Ge (n), each mark frequency component of Gs (n) correspondences
The amplitude and phase of current demand signal；
<403>Generation needs the target vibration damping signal of damping respectively, is multiplied by transmission function, generation drive signal Da (n), Db
(n), Dc (n), Dd (n), De (n).
Step 500 comprises the following steps：
<501>To the drive signal Da (n) of output, Db (n), Dc (n), Dd (n), De (n) carries out filtering interpolation, so that full
The requirement of sufficient hardware DA actual output frequencies.
<502>Data signal is converted to analog signal by controller by DA, and is defeated by actuator as an electrical current.
It should be understood that the present embodiment is only illustrative of the invention and is not intended to limit the scope of the invention.In addition, it is to be understood that
Read after the content of the invention lectured, those skilled in the art can make various changes or modifications to the present invention, these etc.
Valency form equally falls within the application appended claims limited range.
Claims (6)
1. a kind of power capacitor noise control method based on Vibration Active Control, it is characterized in that, including m power capacitor
(1) the m acceleration transducer (2) on each power capacitor, noise transducer (3), controller (4), difference, are respectively arranged on
M actuator (5) on each power capacitor；Controller respectively with each acceleration transducer, noise transducer and
Each actuator is electrically connected；Comprise the following steps：
(1-1) each acceleration transducer gathers the vibration signal on power capacitor surface respectively, close to each power capacitor
Noise transducer acquisition noise signal；
(1-2) controller detects the correlation of vibration and noise by coherent function, chooses damping component；
(1-3) controller carries out actuator transmission function identification to damping component；
(1-4) calculates active vibration damping drive signal；
(1-5) controller output m roads vibration reduction control signal arrives m actuator respectively；
(1-6) repeat step (1-1) to (1-3)；
(1-7) controller updates actuator transmission function；Return (1-4).
2. the power capacitor noise control method according to claim 1 based on Vibration Active Control, step (1-1) bag
Include following steps：
(101) m is 5, and controller is with 12.8kHz sample frequency, the vibration signal a of 5 acceleration transducers of continuous acquisition
(n), b (n), c (n), d (n), e (n) and noise transducer noise signal s (n)；
(102) controller carries out quick Fu using 4096 points as data length to a (n), b (n), c (n), d (n), e (n) and s (n)
In leaf transformation, respectively obtain Fa (n), Fb (n), Fc (n), Fd (n), Fe (n), Fs (n)；
(103) controller calculates Fa (n), Fb (n), Fc (n), Fd (n), Fe (n), Fs (n) auto-power spectrum Ga (n), Gb respectively
(n), Gc (n), Gd (n), Ge (n), Gs (n)；By Fa (n), Fb (n), Fc (n), Fd (n), Fe (n) calculates mutual with Fs (n) respectively
Power spectrum, obtains Gas (n), Gbs (n), Gcs (n), Gds (n), Ges (n)；
(104) controller is carried out to each auto-power spectrum and each crosspower spectrum no less than the linear averaging that average is 8；
(105) 30 frequency components of vibration signal amplitude maximum are marked controller.
3. the power capacitor noise control method according to claim 2 based on Vibration Active Control, the step (1-
2) comprise the following steps：
(201) controller calculates vibration signal a (n) and noise signal s (n) coherent signal, obtains coherent signal Coha (n),
Vibration signal b (n) and noise signal s (n) coherent signal are calculated, coherent signal Cohb (n) is obtained；
Vibration signal c (n) and noise signal s (n) coherent signal are calculated, coherent signal Cohc (n) is obtained；
Vibration signal d (n) and noise signal s (n) coherent signal are calculated, coherent signal Cohd (n) is obtained；
Vibration signal e (n) and noise signal s (n) coherent signal are calculated, coherent signal Cohe (n) is obtained；
(202) controller checks x, y, the coefficient of z correspondence coherent functions, by 30 frequencies according to the frequency marker of step (105)
The frequency component that coefficient in component is less than 0.5 is removed, and remaining frequency component is divided for the damping obtained in 30 frequency components
Amount.
4. the power capacitor noise control method according to claim 3 based on Vibration Active Control, the step (1-
3) comprise the following steps：
(301) controller records vibration signal Ga (n), Gb (n), Gc (n), Gd (n), Ge (n), Gs before identification starts respectively
(n)；
(302) controller is controlled according to the rate-adaptive pacemaker actuator of mark, and causes Ga (n), Gb (n), Gc (n), Gd (n), Ge
(n) controlled with Gs (n) in control frequency vibration amplitude change in 20%+/- 3%；
(303) controller calculates transmission letter of the control signal to actuator according to rate of change and drive signal amplitude size variation
Number.
5. the power capacitor noise control method according to claim 1 based on Vibration Active Control, the step (1-
4) comprise the following steps：
(401) controller is using 12.8k as sample rate, the closed loop cycle that every 4 sampled points drive as a vibration damping, five vibrations
Signal is respectively defined as Ga (n), Gb (n), Gc (n), Gd (n), Ge (n), Gs (n)；
(402) controller judges current at Ga (n), Gb (n), Gc (n), Gd (n), Ge (n), Gs (n) correspondence damping components respectively
The amplitude and phase of signal；
(403) controller is generated respectively needs the target vibration damping signal of damping, and target vibration damping signal is multiplied by transmission function, and generation is driven
Dynamic signal Da (n), Db (n), Dc (n), Dd (n) and De (n).
6. the power capacitor noise control method according to claim 5 based on Vibration Active Control, the step (1-
5) comprise the following steps：
(501) controller carries out filtering interpolation to the drive signal Da (n) of output, Db (n), Dc (n), Dd (n) and De (n), from
And meet the requirement of hardware DA actual output frequencies；
(502) each drive signal is converted to analog signal by controller by DA, and is defeated by actuator as an electrical current.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113012675A (en) * | 2019-12-19 | 2021-06-22 | 深圳富泰宏精密工业有限公司 | Active noise reduction system, method and electronic device |
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