CN103439574B - The synchronization suppressing method of arrowband interference in direct-current line corona current measurement data - Google Patents
The synchronization suppressing method of arrowband interference in direct-current line corona current measurement data Download PDFInfo
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Abstract
The present invention relates to synchronize to remove plurality of narrow banding pattern interference present in outdoor UHVDC Transmission Lines corona current signal.This method first passes through the interference electric current and the discrete spectrum of corona current obtaining on the outdoor extra high voltage line that sample rate is identical, it is then determined that interference electric current and the cross-correlation function frequency spectrum of corona current, choose narrow band signal Frequency point in described cross-correlation function frequency spectrum, by removing the amplitude of narrow band signal Frequency point described in described corona current discrete spectrum, obtain the corona current waveform after removing narrow-band interference signal.This invention can realize, to the synchronization suppression of plurality of narrow banding pattern interference signal present in corona current measurement data, having stronger versatility, can be that the corona characteristic research of extra high voltage direct current transmission line provides effective theoretical and technological means.
Description
Technical field:
The present invention relates to UHV transmission technical field, be more particularly to a kind of UHVDC Transmission Lines corona electricity
The synchronization suppressing method of arrowband interference in flow measurement data.
Background technology:
For solving the power load Fast Persistence growth of China's present stage existence, resource distribution needs with national electric power
Seeking unbalanced problem, development Large Copacity remote conveying power technology, construction UHV transmission net are as there being efficacious prescriptions
Case is the most progressively built and implements.Compared with existing electrical network, build extra-high voltage grid will be greatly improved at a distance,
Resource optimization in the efficiency of large capacity transmission, minimizing transmission losses, reduction Transmission Cost, realization on a large scale
Configuration, is the inevitable choice of the strategic objective realizing China's " transferring electricity from the west to the east, north and south supply mutually, on national network ".
At present, Burner zone-Shanghai ± 800kV extra-high voltage direct-current transmission demonstration project is built to put into operation, ± 1100kV electricity
Pressure grade extra-high voltage direct-current systematic research work just moves forward steadily.
Build extra-high voltage grid and will inevitably face corona problem.The corona phenomenon bag of DC power transmission line
Include corona loss, field effect, radio interference and audible noise etc., thus will produce the fortune of direct current transportation
Row loss and series of environmental problems.Therefore, carry out the research of extra-high voltage direct-current corona characteristic, for obtaining
Engineering design foundation, rationally selection wire pattern, reduction corona effect and running wastage etc. have important meaning
Justice.
At State Grid Corporation of China's Beijing UHV DC test base station, with outdoor large corona cage and test line segment
For relying on, utilize " wide frequency domain measurement system " to obtain the corona current data under different electric pressure, go forward side by side
Row systematic analysis is studied.Owing to this acquisition system is positioned at open air and the tallest and the biggest, except bag in measurement data
Outside corona current signal, also comprise a large amount of narrow band signal from space (such as amplitude modulated broadcast signal, boat
Empty navigation signal) so that corona current data frequency spectrum constitutes complexity, and the analysis work for corona itself is difficult to
Carry out.
For the suppression of arrowband type interference, classical method is that the characteristic Design respective digital utilizing signal self is filtered
Ripple device.But in corona current measurement data, it is large number of that arrowband type disturbs, and is distributed in wider frequency
On band, digital filtering method is utilized to be difficult to the reservation simultaneously taking into account noise suppressed with remaining band spectrum characteristic.
Accordingly, it would be desirable to design effective solution, can realize the synchronization of plurality of narrow banding pattern interference in data is pressed down
System, will not change again the spectral characteristic of remaining frequency band.So, corona current data will be greatly improved.
The method that the present invention proposes, just can solve the problems referred to above.
Summary of the invention:
It is an object of the invention to provide the synchronization of arrowband interference in a kind of direct-current line corona current measurement data to press down
Method processed, this method be only extra high voltage direct current transmission line electromagnetic environment research provide theoretical basis with
The implementation method effectively analyzed, and be that the further of corona characteristic studies the basis having established necessity.
For achieving the above object, the present invention is by the following technical solutions: direct-current line corona current measurement data
The synchronization suppressing method of middle arrowband interference, said method comprising the steps of:
(1) the identical interference current measurement data of sample rate and the discrete spectrum of corona current measurement data are obtained；
(2) the cross-correlation function frequency spectrum of interference current measurement data and corona current measurement data is determined；
(3) narrow band signal Frequency point in described cross-correlation function frequency spectrum is chosen；
(4) amplitude of narrow band signal Frequency point described in described corona current measurement data discrete spectrum is removed；
(5) corona current measurement data time domain waveform and the frequency spectrum of the described narrow band signal of removal are obtained.
The synchronization suppressing method of arrowband interference, institute in the direct-current line corona current measurement data that the present invention provides
State the acquisition of corona current data in step (1) to comprise the following steps:
(1-1) obtain wide frequency domain and measure the sampling corona current measurement data of system；
(1-2) described sampling corona current measurement data is filtered Hz noise and obtain described corona current.
The synchronization suppressing method of arrowband interference in the direct-current line corona current measurement data that the present invention provides, its
It is characterised by: described interference current measurement data and corona current measurement data are become by discrete fourier respectively
Change and obtain respective discrete spectrum.
In another preferred direct-current line corona current measurement data that the present invention provides, the synchronization of arrowband interference presses down
Method processed, it is characterised in that: described cross-correlation function frequency spectrum is obtained by power spectral density function, described merit
Rate spectral density function is:
Wherein X (k), Y (k) are that the Fourier transformation of discrete signal x (n), y (n), x (n) and y (n) are respectively
Interference current measurement data and corona current measurement data,For the conjugation of Y (k), N is data length.
The synchronization of arrowband interference in another preferably direct-current line corona current measurement data that the present invention provides
Suppressing method, in described step (3), choosing of narrow band signal Frequency point comprises the following steps:
(3-1) threshold value of noise signal amplitude is determined；
(3-2) record amplitude in described cross-correlation function frequency spectrum and be more than the Frequency point of described threshold value.
In the another preferred direct-current line corona current measurement data that the present invention provides, the synchronization of arrowband interference presses down
Method processed, described threshold value is the meansigma methods of described power spectral density function amplitude.
In the another preferred direct-current line corona current measurement data that the present invention provides, the synchronization of arrowband interference presses down
Method processed, is removed the amplitude of narrow band signal Frequency point in described step (4) by zero.
In the another preferred direct-current line corona current measurement data that the present invention provides, the synchronization of arrowband interference presses down
Method processed, uses method of least square that the Frequency point periphery frequency range carrying out return-to-zero is done low order order polynomial and intends
Close, using the amplitude of curve after matching as the amplitude after described periphery frequency range return-to-zero, after being processed
Corona current measurement data frequency spectrum；
Described periphery frequency range is respectively to take in the narrow band signal Frequency point left and right both direction of pre-made return-to-zero not surpass
Cross this Frequency point bandwidth 1/10 frequency range long.
In the another preferred direct-current line corona current measurement data that the present invention provides, the synchronization of arrowband interference presses down
Method processed, described order is 2 times or 3 times.
In the another preferred direct-current line corona current measurement data that the present invention provides, the synchronization of arrowband interference presses down
Method processed, is obtained the corona current measurement data frequency spectrum after described process by inverse discrete Fourier transform
Corona current measurement data time domain waveform.
Owing to have employed technique scheme, the present invention obtains providing the benefit that:
1, the effective ways such as discrete Fourier transform, cross-correlation test and frequency domain analysis of threshold are combined by the present invention
Get up, the plurality of narrow banding pattern in extra-high voltage DC corona current measurement data disturbs to achieve synchronizing and effective
Suppression, have that automaticity is high, the advantage of highly versatile；
2, the present invention can realize the automatic inspection of multiple different arrowbands interference, effectively reduce human intervention
Composition, good basis has been established in the research for corona characteristic；
3, for ensureing the seriality of data spectrum in the present invention, it is to avoid after frequency spectrum sudden change causes inverse Fourier transform
Signal produce local with edge shake, use the method for least square center frequency points to return-to-zero need to be carried out
Periphery frequency range does low order order polynomial matching, using the amplitude of curve after matching as after this frequency range return-to-zero
Amplitude, thus it has been effectively retained the frequency domain character of primary signal, reduce the possibility of wave distortion；
4, in the present invention, the picture of result of the test also demonstrates corona current signal and has had bigger changing in time domain
Kind, the plurality of narrow band signal that frequency spectrum Central Plains exists also is efficiently removed.
Accompanying drawing explanation
Fig. 1 is the method flow schematic diagram of the present invention；
Fig. 2 a is that the present invention disturbs current measurement data time domain waveform schematic diagram, and Fig. 2 b is that the present invention disturbs electricity
Flow measurement data spectrum schematic diagram；
Fig. 3 a is that the present invention samples corona current measurement data time domain waveform schematic diagram, and Fig. 3 b is that the present invention adopts
Sample corona current measurement data spectrum diagram；
Fig. 4 a is that present invention corona current measurement data of sampling removes the time domain waveform after Hz noise, Fig. 4 b
The spectrum diagram after Hz noise is removed for present invention corona current measurement data of sampling；
Fig. 5 be corona current measurement data of the present invention with the cross-correlation function frequency spectrum of interference current measurement data and
Threshold value, wherein laterally heavy line represents threshold value position；
Fig. 6 a is the time domain waveform schematic diagram after corona current measurement data of the present invention removes narrow band signal, figure
6b is the spectrum diagram after corona current measurement data of the present invention removes arrowband interference.
Detailed description of the invention
Below in conjunction with embodiment, the invention will be described in further detail.
Embodiment 1:
As it is shown in figure 1, the step of the inventive method of this example is:
(1) the identical interference current measurement data of sample rate and the discrete spectrum of corona current measurement data are obtained.
Obtain the UHVDC Transmission Lines interference current measurement data gathered under phase same date to survey with corona current
Amount data (negative or positive electrode), and judge the two sample rate, if sample rate is different, then uses and rise sampling side
Method adjusts；If identical, make discrete Fourier transform the most respectively, it is thus achieved that the discrete spectrum of signal.Out of doors,
Aerial condutor has for receiving the signal (such as amplitude modulated broadcast signal, aviation navigation signals etc.) from space
Certain uncertainty, the broadcast slot such as each amplitude modulation broadcasting is different, and the signal energy that wire receives is the most not to the utmost
Identical, therefore use internal phase on the same day can carry with corona current measurement data with the interference current measurement data of period
The accuracy of high result of the test.
Described corona current measurement data obtaining step includes:
(1-1) obtain wide frequency domain and measure systematic sampling corona current measurement data,
(1-2) described sampling corona current measurement data is filtered Hz noise and obtains corona current measurement number
According to.
The present invention use extra-high voltage direct-current sampling corona current sample data from " wide frequency domain measurement system ",
This system sampling frequency scope is 1kHz～1GHz, and sample frequency is the most adjustable.For comprehensive study corona characteristic,
The data that test obtains under the conditions of retaining plurality of sampling rates.
Be respectively shown in Fig. 2 a and b interference current measurement data be measurement data under power ground state time
Domain waveform figure and frequency spectrum, described sampling corona current measurement data is+800kV electric pressure, and sample rate is
62.5MHz, test period is the morning on May 31st, 2012, shown in Fig. 3 a and b be respectively as described in adopt
The time domain beamformer of sample corona current measurement data and frequency spectrum.
For ensureing follow-up work correctness, before the arrowband type interference minimizing technology that the application present invention announces,
Need sampling corona current measurement data is carried out pretreatment, filter the Hz noise in signal, such as Fig. 4 a and
Shown in b, it is respectively the time domain beamformer after sampling corona current measurement data removal Hz noise and frequency spectrum.
(2) the cross-correlation function frequency spectrum of interference current measurement data and corona current measurement data is determined.
Utilize the interference current measurement data and the discrete spectrum of corona current measurement data obtained, do dry in frequency domain
Disturb the cross-correlation function frequency spectrum of current data measurement data and corona current measurement data.
Cross-correlation function frequency spectrum can be by power spectral density function SxyK () is tried to achieve, computing formula is as follows:
Wherein X (k), Y (k) are that the Fourier transformation of discrete signal x (n), y (n), x (n) and y (n) are respectively
Interference current measurement data and+800kV corona current measurement data,For the conjugation of Y (k), N is data
Length.As shown in Figure 5, it is seen that exist in corona current measurement data in interference current measurement data simultaneously
Narrow band signal be effectively maintained.
From Fig. 5 cross-correlation function frequency spectrum, phase in interference current measurement data and corona current measurement data
The narrow band signal of same frequency will be retained, and its result is still the narrow band signal of primary frequency, and due to difference frequency
The periodic signal of rate is orthogonal, and the situation of spectral aliasing will not occur.Thus be only concurrently present in
Interference current measurement data is disturbed from the multiple different arrowband type in corona current measurement data.
(3) narrow band signal Frequency point in described cross-correlation function frequency spectrum is chosen.
First determine the threshold value of noise signal amplitude, when reality is measured, owing to noise is through power spectral density letter
The process of number makes noise amplitude be impaired to small value, therefore is determined by noise amplitude in cross-correlation function frequency spectrum
Threshold value divide arrowband interference and the amplitude of noise.In frequency domain, the amplitude of narrow band signal is relatively big, and only
Part frequency occurs, and weakened noise amplitude is the least, and be present in whole frequency band, therefore
The meansigma methods choosing described power spectral density function amplitude is described threshold value, to reach to suppress the mesh of arrowband interference
's.As it is shown in figure 5, wherein laterally heavy line represents described threshold value position, it is seen then that threshold value is well
By the amplitude of two class signals separately: finally record amplitude in described cross-correlation function frequency spectrum and be more than described threshold value
Frequency point numerical value.
(4) amplitude of narrow band signal Frequency point described in corona current measurement data discrete spectrum is removed.
Narrow band signal by corresponding for the frequency spectrum of the corona current measurement data after former removal Hz noise above-mentioned record
Frequency point processes, if certain Frequency point in this corona current measurement data frequency spectrum and the narrow band signal of record
Frequency point is identical, then the amplitude of the Frequency point in this corona current measurement data frequency spectrum shunk to zero；If no
With, then the amplitude of the Frequency point in this corona current measurement data frequency spectrum is retained, do not process.
For ensureing the seriality of above-mentioned corona current measurement data frequency spectrum, it is to avoid the sudden change of its frequency spectrum causes Fourier
Signal after inverse transformation produces local and shakes with edge, in the present invention, uses method of least square to returning
The periphery frequency range of zero Frequency point processed does low order order polynomial matching, and described order is 2 times or 3 times, will intend
After conjunction, the amplitude of curve is as the amplitude after described periphery frequency range return-to-zero, thus has been effectively retained original letter
Number frequency domain character, reduce the possibility of wave distortion；Described periphery frequency range is narrow at pre-made return-to-zero
The frequency range that band signal Frequency point left and right both direction respectively takes less than the 1/10 of this Frequency point bandwidth is long.
(5) corona current measurement data time domain waveform and the frequency spectrum of the described narrow band signal of removal are obtained.
The frequency spectrum of the corona current measurement data after carrying out return-to-zero is carried out inverse discrete Fourier transform,
To removing the corona current measurement data time domain waveform after arrowband disturbs.
As shown in Fig. 6 a and b, for corona current measurement data time domain beamformer after above-mentioned process and frequency spectrum,
Visible, compared with Fig. 4 a, b, corona current measurement data has had obvious improvement in time domain, in frequency spectrum
The plurality of narrow band signal of former existence is also efficiently removed, and the method proposed for the present invention has obtained effective checking.
Finally should be noted that: it is only limited by above example in order to technical scheme to be described
System, although the present invention being described in detail with reference to above-described embodiment, those of ordinary skill in the field
It is understood that still the detailed description of the invention of the present invention can be modified or equivalent, and do not take off
From any amendment or the equivalent of spirit and scope of the invention, it all should be contained in present claims scope
In the middle of.
Claims (7)
1. the synchronization suppressing method of arrowband interference in direct-current line corona current measurement data, it is characterised in that:
Said method comprising the steps of:
(1) the identical interference current measurement data of sample rate and the discrete spectrum of corona current measurement data are obtained；
(2) the cross-correlation function frequency spectrum of interference current measurement data and corona current measurement data is determined；
(3) narrow band signal Frequency point in described cross-correlation function frequency spectrum is chosen；
(4) amplitude of narrow band signal Frequency point described in described corona current measurement data discrete spectrum is removed；
(5) corona current measurement data time domain waveform and the frequency spectrum of the described narrow band signal of removal are obtained；
In described step (1), the acquisition of corona current measurement data comprises the following steps:
(1-1) obtain wide frequency domain and measure the sampling corona current measurement data of system；
(1-2) described sampling corona current measurement data is filtered Hz noise and obtains the measurement of described corona current
Data；
In described step (3), choosing of narrow band signal Frequency point comprises the following steps:
(3-1) threshold value of noise signal amplitude is determined；
(3-2) record amplitude in described cross-correlation function frequency spectrum and be more than the Frequency point of described threshold value；
Described threshold value is the meansigma methods of power spectral density function amplitude；
Described power spectral density function is:
Wherein X (k), Y (k) are that the Fourier transformation of discrete signal x (n), y (n), x (n) and y (n) are respectively
Interference current measurement data and corona current measurement data,For the conjugation of Y (k), N is data length.
2. the synchronization suppression of arrowband interference in direct-current line corona current measurement data as claimed in claim 1
Method, it is characterised in that: described interference current measurement data and corona current measurement data are respectively by discrete
Fourier changes the respective discrete spectrum of acquisition.
3. the synchronization suppression of arrowband interference in direct-current line corona current measurement data as claimed in claim 1
Method, it is characterised in that: described cross-correlation function frequency spectrum is obtained by power spectral density function.
4. the synchronization suppression of arrowband interference in direct-current line corona current measurement data as claimed in claim 1
Method, it is characterised in that: the amplitude of narrow band signal Frequency point in described step (4) is removed by zero.
5. the synchronization suppression of arrowband interference in direct-current line corona current measurement data as claimed in claim 4
Method, it is characterised in that: use method of least square that the Frequency point periphery frequency range carrying out return-to-zero is done low order
Order polynomial matching, using the amplitude of curve after matching as the amplitude after described periphery frequency range return-to-zero,
Corona current measurement data frequency spectrum after process；
Described periphery frequency range is respectively to take in the narrow band signal Frequency point left and right both direction of pre-made return-to-zero not surpass
Cross this Frequency point bandwidth 1/10 frequency range long.
6. the synchronization suppression of arrowband interference in direct-current line corona current measurement data as claimed in claim 5
Method, it is characterised in that: described order is 2 times or 3 times.
7. the synchronization suppression of arrowband interference in direct-current line corona current measurement data as claimed in claim 6
Method, it is characterised in that: the corona current measurement data frequency spectrum after described process is inverse by discrete fourier
The corona current measurement data time domain waveform that conversion obtains.
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| CN105954565B (en) * | 2016-05-26 | 2019-09-17 | 中国电力科学研究院 | A kind of extracting method of hvdc transmission line corona current signal |
| CN108535863B (en) * | 2018-03-30 | 2020-10-27 | 武汉华星光电技术有限公司 | Cover plate processing method, controller, cover plate processing device and storage medium |
| CN109188220B (en) * | 2018-08-31 | 2022-09-09 | 中国电力科学研究院有限公司 | Method and system for evaluating time domain index of corona current signal of power transmission line |
| CN110031676A (en) * | 2019-03-21 | 2019-07-19 | 国网浙江省电力有限公司电力科学研究院 | Corona current impulse waveform approximating method based on Fourier transformation |
| CN113740678A (en) * | 2021-08-02 | 2021-12-03 | 中国电力科学研究院有限公司 | Noise reduction method and system suitable for corona current measurement data |
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