CN106482825B - A kind of filtering method of transmission line of electricity corona noise background interference - Google Patents
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Abstract
The present invention provides a kind of filtering method of transmission line of electricity corona noise background interference, and this method is synchronous to carry out equivalent A-weighted sound pressure level measurement by above the ground arranging that a number of noise testing is popped one's head under DC line；Determine the spatial noise attenuation coefficient in test environment；Background noise level is calculated according to the relative positional relationship of arrangement noise probe and route in real time based on the audible noise A sound level data that synchro measure obtains；And ambient noise is subtracted from the measurement data comprising ambient noise, obtain the corona noise size of transmission line of electricity.Method proposed by the present invention is simple and easy, it can be realized and reject to real-time synchronization ambient noise interference during DC power transmission line noise testing, tester is facilitated to grasp the valid data quantity in measurement data in time, and the workload of follow-up data processing is alleviated, it is of great significance for the corona noise characteristic and Study on Forecasting Method of transmission line of electricity.
Description
Technical field
The present invention relates to a kind of ambient noises to filter out method, and in particular to a kind of transmission line of electricity corona noise background interference
Filtering method.
Background technique
With the rapid development of social economy, the people is also higher and higher for the attention degree of environmental protection, especially right
The concern of DC power transmission line corona noise is also more and more, and this requires build up throwing to DC line at the beginning of route designs
Noise level after fortune has a science accurately to predict.
DC power transmission line corona noise is difficult to be characterized as accurate mathematical modulo due to its mechanism of production complexity, prediction technique
Type typically uses the form of empirical equation, i.e., by testing different conductor, is carrying out statistical to measurement result
Empirical equation is fitted on the basis of analysis.That be widely used at present is U.S. BPA (Bang Naweier power office, the U.S.) and EPRI (beauty
Electric Power Research Institute, state) recommended method, these methods are obtained by experimental test.Therefore, transmission line of electricity is being carried out
When audible noise is tested, guarantee that the authentic and valid of test data is the most important premise of prediction technique accurate and effective.
When carrying out audible noise test, Ying Jinliang avoids the interference of environmental background noise.But due to transmission line of electricity geometry
Size is larger, tests substantially based on open field test line segment and actual track.But outdoor test inevitably encounters background
The problem of noise jamming, noise testing result not only contain corona noise component, further comprise background noise component, such as wind
Sound, the motor vehicle noise on highway, millwork noise, the noise etc. of resident living area.The presence of ambient noise, makes power transmission line
The audible noise test result serious distortion on road, seriously affects evaluation and the forecast value revision of transmission line of electricity audible noise.Therefore, it needs
A kind of method is found, by the ambient noise interference filtering in transmission line of electricity audible noise measuring result.
Technical aspect is filtered out in transmission line of electricity audible noise background interference, generally uses two class methods at present.The first is
Before noise testing, test line segment or actual track are had a power failure, measure the ambient noise of tested point, then transmission line voltage uprating is extremely tested
Noise result is subtracted ambient noise and obtains actual corona noise by voltage.But this method is only applicable to ambient noise more
Constant area can not effectively filter out if being raised and lowered to ambient noise monolithic stability during the test.In addition, by
In the impossible temporary interruption of actual track, therefore this method is not suitable for the DC power transmission line of actual motion yet.Second of side
Formula is to place a noise testing probe in the position far from test line segment or actual track, records back in real time during the test
Scape noise.But the disadvantages of the method are as follows ambient noise tests probe palpus in order to avoid corona noise has an impact background measurement
Whether it is arranged in background noise level under the background noise level from transmission line of electricity remote position, but at the position and route
It is able to maintain unanimously, still has uncertainty.
Summary of the invention
In view of this, a kind of filtering method of transmission line of electricity corona noise background interference provided by the invention, this method will
Noise transmission theory is applied to DC power transmission line, simple and easy, can be realized in DC power transmission line noise testing process
Ambient noise interference is rejected to middle real-time synchronization, tester is facilitated to grasp the valid data quantity in measurement data in time, and
The workload of follow-up data processing is alleviated, while ensure that the authenticity and validity of data, improves transmission line of electricity operation
Reliability.
The purpose of the present invention is what is be achieved through the following technical solutions:
A kind of filtering method of transmission line of electricity corona noise background interference, the method for filtering out high-voltage dc transmission in real time
Corona noise background interference in electric line；Described method includes following steps:
At ground of the step 1. below the transmission line of electricity in measured zone, arrangement noise testing probe；
Attenuation characteristic of the step 2. according to the corona noise during spatial determines that corona free noise background is dry
Disturb the noise attenuation in environment；
All for the noise testing probe under the electriferous state of the transmission line of electricity, synchronous progress is equivalent continuous for step 3.
A sound level measurement, and obtain the measurement result as unit of group；
Step 4. the equivalent continuous A sound level measurement carry out in, according to decision principle judge every group described in measurement result；
If the measurement result meets the decision principle, retain the group measurement result；
If the measurement result is unsatisfactory for the decision principle, the group measurement result, and return step 3 are deleted；
The measurement result that step 5. pair retains is analyzed in real time, obtains the corona noise background of the measured zone
Interference value；
Step 6. filters out the corona noise background interference of the measured zone, obtains and store the reality of the transmission line of electricity
Corona noise level value.
Preferably, the step 1, comprising:
At the ground below transmission line of electricity in measured zone, origin is projected as over the ground with positive wire, along described defeated
The vertical-path of electric line arranges the noise testing probe to the measurement point of its two sides；
Noise testing probe is that audibly noise testing is popped one's head in, and the quantity of noise testing probe for 3 and
More than；
Position under the line of the positive wire be in the measurement point must measuring point；
The linear distance of any one described noise testing probe and the origin, which is respectively less than, is equal to 50m.
Preferably, the step 2, comprising:
2-1. measures and records the sound source of the corona noise and travels to linear distance everywhere to it；
2-2. travels to linear distance everywhere and corona noise to it according to the sound source of the corona noise and passes in space
Attenuation characteristic during broadcasting obtains the corona noise in corona free noise background interference environment and propagates to position at any two
Set the noise attenuation Δ of A, BAB:
ΔAB=k (lg DA-lg DB) (1)
In formula, DAFor linear distance of the sound source to position A of the corona noise, DBFor the corona noise sound source extremely
The linear distance of position B, k are air attenuation coefficient；Wherein, the value range of k is 10~13.
Preferably, the step 3, comprising:
All the noise testing probe at the same time and measures under the electriferous state of the transmission line of electricity
It is beginning and ending time, synchronous to carry out equivalent continuous A sound level measurement；The time interval is 1 to 10s；Every a time interval
The obtained measurement result of measurement be measurement result described in one group.
Preferably, the decision principle in the step 4, comprising:
A. the noise testing value at the origin is maximum, and with the increase away from positive wire distance, the measurement result
It is gradually reduced；
B. the measurement result of adjacent noise testing probe meets following relationship:
In formula, 1 is the Position Number being closer away from positive wire, and 2 be the position volume away from positive wire distance remotely
Number, AN1For the noise measurement at position 1, AN2For the noise measurement at position 2, D1And D2Respectively 1 He of position
Direct range of the position 2 away from positive wire.
Preferably, the step 5, comprising:
5-1. measurement result described in each group of reservation is analyzed in real time and ΔAB, determine its corona noise background interference
Value ANBack:
In formula, ANA、ANBNoise equivalent A sound level test result at respectively any two positions A, B, ANBackFor ambient noise
Value；
If the AN at 5-2. different locationBackDifference when being respectively less than 3dB (A), acquire the corona noise back being all grouped
Scape interference value ANBackArithmetic mean number, the average corona noise background interference values of the as described measured zone, otherwise, reply survey
Region is further is divided for amount, individually seeks corona noise background interference values to measured zone after each subdivision.
Preferably, the step 6, comprising:
6-1. filters out the corona noise background interference of the measured zone, obtains the practical corona noise of the transmission line of electricity
Level value ANIt is real:
In formula, ANIt surveysThe noise measurement of current transmission line of electricity, the average background interference value of the measured zone are ANIt is average,
ANIt is realFor practical corona noise level value；
6-2. stores the practical corona noise level value AN of the transmission line of electricityIt is real。
It can be seen from the above technical scheme that the present invention provides a kind of filters of transmission line of electricity corona noise background interference
Except method, this method is synchronous to carry out Equivalent A by above the ground arranging that a number of noise testing is popped one's head under DC line
Sound level measurement；Determine the spatial noise attenuation coefficient in test environment；The audible noise A sound level number obtained based on synchro measure
According to background noise level is calculated in real time according to arrangement noise probe and the relative positional relationship of route；And from including background
Ambient noise is subtracted in the measurement data of noise, obtains the corona noise size of transmission line of electricity.Method proposed by the present invention is simple
It is easy, it can be realized and reject to real-time synchronization ambient noise interference during DC power transmission line noise testing, facilitate test
Personnel grasp the valid data quantity in measurement data in time, and alleviate the workload of follow-up data processing, ensure that simultaneously
The authenticity and validity of data, improve transmission line of electricity reliability of operation.
Compared with the latest prior art, technical solution provided by the invention has following excellent effect:
1, in technical solution provided by the present invention, by above the ground arranging a number of noise under DC line
Measuring probe, it is synchronous to carry out equivalent A-weighted sound pressure level measurement；Determine the spatial noise attenuation coefficient in test environment；Based on synchro measure
Background is calculated according to the relative positional relationship of arrangement noise probe and route in obtained audible noise A sound level data in real time
Noise level；And ambient noise is subtracted from the measurement data comprising ambient noise, obtain the corona noise size of transmission line of electricity；
Solving current common methods cannot achieve real-time wiping out background noise jamming during transmission line of electricity audible noise measuring
Problem, especially in the presence of environmental background noise is continual and steady, this method is equally applicable, and the inventive method is in actual use
It is more accurate compared with other methods and simple and easy.
2, technical solution provided by the present invention, it is simple and easy, it can be realized in DC power transmission line noise testing process
Ambient noise interference is rejected to middle real-time synchronization, tester is facilitated to grasp the valid data quantity in measurement data in time, and
The workload of follow-up data processing is alleviated, while ensure that the authenticity and validity of data, improves transmission line of electricity operation
Reliability.
3, technical solution provided by the invention, is widely used, and has significant Social benefit and economic benefit.
Detailed description of the invention
Fig. 1 is a kind of flow chart of the filtering method of transmission line of electricity corona noise background interference of the invention；
Fig. 2 is the flow diagram of the step 2 in filtering method of the invention；
Fig. 3 is the flow diagram of the step 5 in filtering method of the invention；
Fig. 4 is the flow diagram of the step 6 in filtering method of the invention；
Fig. 5 is noise testing Probe arrangement position view in the application examples of filtering method of the invention；
Fig. 6 is the audible noise initial data that a period of time interior measurement in the application examples of filtering method of the invention obtains
Schematic diagram；
Fig. 7 is the corona noise schematic diagram data after the wiping out background in the application examples of filtering method of the invention；
Fig. 8 is that the background in the application examples of filtering method of the invention filters out corona noise data pair under the positive wire of front and back
Compare schematic diagram.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
The embodiment of the present invention, every other reality obtained by those of ordinary skill in the art without making creative efforts
Example is applied, shall fall within the protection scope of the present invention.
As shown in Figure 1, the present invention provides a kind of filtering method of transmission line of electricity corona noise background interference, method is for real
When filter out corona noise background interference in HVDC transmission line；Method includes the following steps:
At ground of the step 1. below the transmission line of electricity in measured zone, arrangement noise testing probe；
Attenuation characteristic of the step 2. according to corona noise during spatial determines that corona free noise background interferes ring
Noise attenuation in border；
Step 3. whole noise testing probe is synchronous to carry out equivalent continuous A sound level survey under the electriferous state of transmission line of electricity
Amount, and obtain the measurement result as unit of group；
Step 4. judges every group of measurement result according to decision principle in equivalent continuous A sound level measurement carries out；
If measurement result meets decision principle, retain this group of measurement result；
If measurement result is unsatisfactory for decision principle, this group of measurement result, and return step 3 are deleted；
The measurement result that step 5. pair retains is analyzed in real time, obtains the corona noise background interference values of measured zone；
Step 6. filters out the corona noise background interference of measured zone, obtains and store the practical corona noise of transmission line of electricity
Level value.
Step 1, comprising:
At the ground below transmission line of electricity in measured zone, origin is projected as over the ground with positive wire, along power transmission line
The vertical-path on road is popped one's head in the arrangement noise testing of the measurement point of its two sides；
Noise testing probe is audibly noise testing probe, and the quantity of noise testing probe is 3 or more；
Position under the line of positive wire be in measurement point must measuring point；
The linear distance of any one noise testing probe and origin, which is respectively less than, is equal to 50m.
As shown in Fig. 2, step 2, comprising:
2-1. measures and records the sound source of corona noise and travels to linear distance everywhere to it；
2-2. travels to linear distance everywhere and corona noise in spatial mistake to it according to the sound source of corona noise
Attenuation characteristic in journey obtains the corona noise in corona free noise background interference environment and propagates to position A, B at any two
Noise attenuation ΔAB:
ΔAB=k (lg DA-lg DB) (1)
In formula, DAFor linear distance of the sound source to position A of corona noise, DBIt is straight to position B for the sound source of corona noise
Linear distance, k are air attenuation coefficient；Wherein, the value range of k is 10~13.
Step 3, comprising:
Whole noise testing probes are under the electriferous state of transmission line of electricity, when at the same time and measuring start-stop
Between, it is synchronous to carry out equivalent continuous A sound level measurement；Time interval is 1 to 10s；Every the survey that the measurement of a time interval obtains
Measuring result is one group of measurement result.
Decision principle in step 4, comprising:
A. the noise testing value at origin is maximum, and with the increase away from positive wire distance, measurement result is gradually reduced；
B. the measurement result of adjacent noise testing probe meets following relationship:
In formula, 1 is the Position Number being closer away from positive wire, and 2 be the position volume away from positive wire distance remotely
Number, AN1For the noise measurement at position 1, AN2For the noise measurement at position 2, D1And D2Respectively 1 He of position
Direct range of the position 2 away from positive wire.
As shown in figure 3, step 5, comprising:
5-1. is analyzed in real time each group measurement result of reservation and ΔAB, determine its corona noise background interference values
ANBack:
In formula, ANA、ANBNoise equivalent A sound level test result at respectively any two positions A, B, ANBackFor ambient noise
Value；
If the AN at 5-2. different locationBackDifference when being respectively less than 3dB (A), it is dry to acquire the corona noise background being all grouped
Disturb value ANBackArithmetic mean number, as average corona noise background interference values of measured zone, otherwise, reply measured zone are done
It is further to divide, corona noise background interference values are individually asked to measured zone after each subdivision.
As shown in figure 4, step 6, comprising:
6-1. filters out the corona noise background interference of measured zone, obtains the practical corona noise level value of transmission line of electricity
ANIt is real:
In formula, ANIt surveysThe noise measurement of current transmission line of electricity, the average background interference value of measured zone are ANIt is average, ANIt is realFor
Practical corona noise level value；
The practical corona noise level value AN of 6-2. storage transmission line of electricityIt is real。
The present invention provides a kind of application examples of the filtering method of transmission line of electricity corona noise background interference, can be real-time and accurately
Environmental background noise is mutually separated with the corona noise of DC line, to obtain filtering out DC power transmission line；The application example
Specific steps are as follows:
As shown in figure 5, arranging the audible noise measuring probe of specified quantity at the ground below DC line.Recommend
It is projected as origin over the ground with electrode line conducting wire, horizontal path road radially opposite sides arrange noise testing probe, and Probe arrangement quantity is answered
Be 3 or more, under positive wire line for must measuring point, position suggestion be 0, ± 10m, ± 20m, ± 30m ..., for guarantee
Distalmost end noise testing probe can monitor corona noise value, distalmost end noise testing pop one's head in the position away from origin no more than
50m。
(2) attenuation characteristic of corona noise during spatial is utilized, determines the noise attenuation in ecotopia.
Corona noise attenuation meets
ΔAB=k (lg DA-lg DB) (1)
In formula, DAFor sound source to A point direct range, DBIt is sound source to B point direct range, k is air attenuation coefficient.For
The value of different air regimes, k is not identical, general to be obtained by test, and it is 10~13 that the present invention, which recommends value range,.
(3) under DC power transmission line electriferous state, all noise testing probes are synchronous to carry out equivalent continuous A sound level survey
Amount.The measurement beginning and ending time of different location measuring probe should keep synchronous, and the sampling time is uniformly set as 1s, and measurement pattern is etc.
Imitate continuous A sound level.
(4) in testing, every group of audible noise measuring result is pre-processed, judges whether test data is effective, if
Effectively, then retain this group of data, if in vain, deleting reorganization data.
The decision principle of valid data should meet following two requirements.
1) the noise testing value under electrode line at position (origin) is maximum, with the increase away from positive wire distance, noise
Test result is gradually reduced；
2) noise result of measuring point should meet following relationship at adjacent two
In formula, 1 is the Position Number being closer away from positive wire, and 2 be the position volume away from positive wire distance remotely
Number, AN1For the noise measurement at position 1, AN2For the noise measurement at position 2, D1And D2Respectively 1 He of position
Direct range of the position 2 away from positive wire.
(5) pretreated validity test result is analyzed in real time, determines ambient noise interference level；
Noise result at two positions in valid data is updated to following formula, can determine ambient noise ANBack。
In formula, ANA、ANBNoise equivalent A sound level test result at respectively A, B location, ANBackFor noise floor value.
A noise floor value can be obtained by (2) formula in the audible noise value of position at any two, when noise testing is popped one's head in
When more, noise floor value will also have multiple, when the variation of ambient noise at different location is little, can also pass through arithmetic mean
Some region of average background noise value is obtained, when ambient noise level difference is larger at different location, copes with measured zone
It is finely divided, corona noise background interference values is individually determined to each subdivision measured zone.
(6) background interference values are subtracted on the basis of current audible noise measuring value, obtains the practical electricity of transmission line of electricity
Dizzy noise level, and stored.Specifically processing method is
In formula, measured value ANIt surveys, background value ANBack, practical corona noise value is ANIt is real。
As shown in Fig. 6 to 8, surveyed with the extra-high voltage direct-current test line segment audible noise that State Grid Corporation of China is located at Changping County, Beijing
Illustrate effect of the invention for amount result:
Extra-high voltage direct-current test line segment conducting wire pattern is 4 × 500mm2, conducting wire distance away the ground is 15m, with positive wire pair
It is origin at ground projection, is respectively arranged three noise testing probes in 0m ,+20m and -20m, as shown in Fig. 2.Noise testing is visited
Grease head highness is 1.5m, and microphone is directed to positive polarity conducting wire.The beginning and ending time is synchronous when noise testing, sampling time unified setting
For 1s, measurement pattern is equivalent continuous A sound level.
In the environment relatively quiet period, high voltage is applied to positive polarity conducting wire, distinguish its corona noise can clearly
Know and is greater than ambient noise 10dB (A) or more.By the audible noise at measurement different location, binding isotherm is calculated, is made an uproar
Acoustic attenuation coefficient k is 10.9.
Application ± 600kV voltage bipolar to DC experiment line segment, the audible noise measuring probe at lower three positions of line are same
Step carries out audible noise measuring.Fig. 6 is that the audible noise at the different location in certain a period of time of interception changes over time song
Line, Fig. 7 are to carry out the corona noise after background filters out to initial data according to the method for the present invention to change over time curve, and Fig. 8 is
Background filters out corona noise data comparison under the positive wire of front and back.As can be seen from Figure, it audible is made an uproar using proposed by the present invention
The real-time filtering method of sound background interference, can effective filter out the Environmental Noise Influence being superimposed upon on corona noise, with original test
Data are compared, and the corona noise after wiping out background noise generally reduces by 0.5~3dB (A), and wiping out background noise jamming effect is bright
It is aobvious.
The above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, although referring to above-described embodiment pair
The present invention is described in detail, those of ordinary skill in the art still can to a specific embodiment of the invention into
Row modifies perhaps equivalent replacement and these exist without departing from any modification of spirit and scope of the invention or equivalent replacement
Apply within pending claims of the invention.
Claims (2)
1. a kind of filtering method of transmission line of electricity corona noise background interference, the method for filtering out D.C. high voltage transmission in real time
Corona noise background interference in route；It is characterized in that, described method includes following steps:
At ground of the step 1. below the transmission line of electricity in measured zone, arrangement noise testing probe；
Attenuation characteristic of the step 2. according to the corona noise during spatial determines that corona free noise background interferes ring
Noise attenuation in border；
All the noise testing probe is synchronous to carry out equivalent continuous A sound under the electriferous state of the transmission line of electricity for step 3.
Grade measurement, and obtain the measurement result as unit of group；
Step 4. the equivalent continuous A sound level measurement carry out in, according to decision principle judge every group described in measurement result；
If the measurement result meets the decision principle, retain the group measurement result；
If the measurement result is unsatisfactory for the decision principle, the group measurement result, and return step 3 are deleted；
The measurement result that step 5. pair retains is analyzed in real time, obtains the corona noise background interference of the measured zone
Value；
Step 6. filters out the corona noise background interference of the measured zone, obtains and store the practical corona of the transmission line of electricity
Noise level value；
The step 1, comprising:
At the ground below transmission line of electricity in measured zone, origin is projected as over the ground with positive wire, along the power transmission line
The vertical-path on road arranges the noise testing probe to the measurement point of its two sides；
Noise testing probe is that audibly noise testing is popped one's head in, and the quantity of noise testing probe for 3 or 3 with
On；
Position under the line of the positive wire be in the measurement point must measuring point；
The linear distance of any one described noise testing probe and the origin, which is respectively less than, is equal to 50m；
The step 2, comprising:
2-1. measures and records the sound source of the corona noise and travels to linear distance everywhere to it；
2-2. travels to linear distance everywhere and corona noise in spatial mistake to it according to the sound source of the corona noise
Attenuation characteristic in journey, obtain the corona noise in corona free noise background interference environment propagate to position A at any two,
The noise attenuation △ of BAB:
△AB=k (lgDA-lgDB) (1)
In formula, DAFor linear distance of the sound source to position A of the corona noise, DBFor the corona noise sound source to position B
Linear distance, k is air attenuation coefficient；Wherein, the value range of k is 10~13；
The step 3, comprising:
All noise testings probe is under the electriferous state of the transmission line of electricity, at the same time and measurement start-stop
It is time, synchronous to carry out equivalent continuous A sound level measurement；The time interval is 1 to 10s；Every the survey of a time interval
The measurement result measured is measurement result described in one group；
The decision principle in the step 4, comprising:
A. the noise testing value at the origin is maximum, and with the increase away from positive wire distance, the measurement result is gradually
Reduce；
B. the measurement result of adjacent noise testing probe meets following relationship:
In formula, 1 is the Position Number being closer away from positive wire, and 2 be the Position Number away from positive wire distance remotely, AN1
For the noise measurement at position 1, AN2For the noise measurement at position 2, D1And D2Respectively position 1 and position 2
Direct range away from positive wire；
The step 5, comprising:
5-1. passes through △AB, the measurement result described in each group of reservation analyzed in real time, determines its corona noise background interference values
ANBack:
In formula, ANA、ANBNoise equivalent A sound level test result at respectively any two positions A, B, ANBackFor corona noise background
Interference value；
If the AN at 5-2. different locationBackDifference when being respectively less than 3dB (A), it is dry to acquire the corona noise background being all grouped
Disturb value ANBackArithmetic mean number, the average corona noise background interference values AN of the as described measured zoneIt is average, otherwise, reply is surveyed
Region is further is divided for amount, individually seeks corona noise background interference values to measured zone after each subdivision.
2. the method as described in claim 1, which is characterized in that the step 6, comprising:
6-1. filters out the corona noise background interference of the measured zone, obtains the practical corona noise level of the transmission line of electricity
Value ANIt is real:
In formula, ANIt surveysThe noise measurement of current transmission line of electricity, the average corona noise background interference values of the measured zone are
ANIt is average, ANIt is realFor practical corona noise level value；
6-2. stores the practical corona noise level value AN of the transmission line of electricityIt is real。
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