CN101419247A - Ground ion flow density measurement system for AC/DC parallel powerline and measurement method thereof - Google Patents
Ground ion flow density measurement system for AC/DC parallel powerline and measurement method thereof Download PDFInfo
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- CN101419247A CN101419247A CNA2008102240184A CN200810224018A CN101419247A CN 101419247 A CN101419247 A CN 101419247A CN A2008102240184 A CNA2008102240184 A CN A2008102240184A CN 200810224018 A CN200810224018 A CN 200810224018A CN 101419247 A CN101419247 A CN 101419247A
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Abstract
The invention relates to a system for mensurating the density of an ion current on the ground of an alternating current/direct current parallel electric transmission line and a mensuration method thereof and belongs to the technical field of electromagnetic environment of a high-tension transmission line. The system mainly comprises three parts of an ion current plate, an oscillograph and a computer stored with an ion current density analyzing program, which are connected sequentially, The method comprises the following steps: calibration data of the ion current plat is read; sampling frequency of an oscillograph is arranged; frequency spectrum is carried out on sampling data; peak value frequency is searched; direct current component is extracted; the density of a direct current composition of the ion current is calculated and is subjected to harmonic analysis; the density of an alternating current composition of the ion current is calculated; and the frequency spectrum of the density of the ion current is stored. The system for mensurating the density of the ion current on the ground of the alternating current/direct current parallel electric transmission line is successfully used to mensurate the component of the direct current component and the alternating current component of the ion current on the ground of the alternating current/direct current electric transmission line.
Description
Technical field
The invention belongs to ultra-high-tension power transmission line electromagnetic environment technical field, the particularly exploitation of ground ion flow density measurement system under the AC/DC parallel ultra-high-tension power transmission line.
Background technology
Along with the high speed development that electric system is built, more and more in the application of electric power transfer close quarters AC/DC parallels such as power station, transformer station transmission of electricity.Particularly in the extra-high voltage direct-current power grid construction, the direct current alternating current circuit is compiled in a place near the current conversion station outlet on the one hand, and possible path is identical, with ac and dc circuit adjacent set up in addition altogether the corridor can save occupation of land in a large number, and reduce design difficulty; If remarkable economic efficiency and social benefit can be brought in the shared existing ac transmission of the trans-regional DC power transmission line energy of newly-increased on the other hand long distance corridor.
Yet the AC/DC parallel transmission of electricity may bring some negative effects, and wherein the pollution near the electromagnetic environment parallel line is the problem that must pay close attention to.The electromagnetic environment pollution level is mainly weighed with following physical quantity near the ultra-high-tension power transmission line: radio interference, audible noise, ground electric field, face of land ion current density.Measurement mechanism at above physical quantity only is applicable to independent DC line or alternating current circuit at present, if directly be applied in the AC/DC parallel circuit then or alternating current-direct current can not take into account and be difficult to obtain actual value, maybe can not distinguish the effect that AC and DC causes and be difficult to main electromagnetic pollution source is made judge.
Ion current density generally uses the ion flow plate to measure under the DC line, but when having AC field because capacity effect can form induction current on the ion flow plate, influence is to the measurement of direct-current ion current density.It is generally acknowledged that alternating current circuit corona discharge time space electric charge moves reciprocatingly near lead, there is not space charge near the ground, but near ground under the alternating current-direct current joint line, there is the space charge that produces by the DC line corona discharge, these space charges can produce the gas current of non-direct current on ground under the effect of AC field, use classic method to be difficult to consider these effects.
Summary of the invention
The objective of the invention is for AC/DC parallel powerline ground ion flow density is measured, a kind of ground ion flow density measurement system for AC/DC parallel powerline and method thereof are proposed, can measure the flip-flop and the alternating component of ground ion flow density, thus near the motion state of the space charge in ground under the reflection alternating current-direct current mixing electric field action; Can also carry out real-time continuous to the ground ion current density and measure, help the long-time online detection of AC/DC parallel line electricity magnetic environment.
The ground ion flow density measurement system for AC/DC parallel powerline that the present invention proposes is characterized in that, this system mainly comprises ion flow plate, the oscillograph that links to each other successively and stores computing machine three parts of ion current density routine analyzer;
This ion flow plate is used to receive the time-domain signal of the space charge of motion earthward;
This oscillograph is used for the time-domain signal that the ion flow plate obtains is sampled, and shows sampled signal, and sampled result is delivered to computing machine;
The computing machine that this stores the ion current density routine analyzer is used for the time-domain signal of the exchange current of described sampling is carried out Fourier transform, gets rid of the induction current part, analyzes the interchange, the flip-flop that obtain the measuring position ion current density.
Adopt AC/DC parallel powerline ground ion flow density measurement method, it is characterized in that, may further comprise the steps as above-mentioned system:
(1) reads ion flow plate calibration data: need before the ion flow plate uses to calculate ion current density ρ (with μ A/m according to ion flow plate area
2Be unit) record electric current I with the ion flow plate
OutThe ratio C OEF of (is unit with μ A) is as calibration data, and deposits this calibration data in computing machine, reads when measuring beginning each.
(2) the oscillograph sample frequency is set: oscillograph sample frequency f
sSpan be:
10×f
h≤f
s≤5×N
s
In the formula: f
hBe the 50Hz power frequency; N
sBe the oscillograph sampling number; And oscillograph is provided with by gpib interface;
(3) sampled data is carried out spectrum analysis, the search peak frequency: the control oscillograph reads ion flow plate output signal, obtains time domain waveform, the time domain waveform of this signal is carried out fast fourier transform obtain frequency spectrum; Search Local Extremum in the frequency spectrum of ion flow plate output signal, write down each crest frequency f
pWith peak amplitude I
pFoundation as subsequent analysis;
(4) extract DC component, calculate ion current density flip-flop: flip-flop and alternating component in the measuring-signal are handled respectively.The direct current signal amplitude can be by obtaining asking on average after the time domain waveform filtering.
(5) carry out frequency analysis, calculate the ion current density alternating component: with power frequency 2 subharmonic in the measuring-signal frequency spectrum is that counter the pushing away of 100Hz component amplitude exchanges the gas current amplitude, 100Hz harmonic component amplitude and 50Hz fundamental voltage amplitude ratio are 0.4248 in the half cycle sine wave of frequency 50Hz, so 50Hz interchange gas current amplitude is 1/0.4248=2.354 times of 100Hz component amplitude value in the measuring-signal.
(6) ion storage current density frequency spectrum: the ion current density spectrum information that analysis is obtained is stored in the computing machine standby.
Characteristics of the present invention and beneficial effect:
The ground ion flow density measurement system for AC/DC parallel powerline that the present invention proposes is the measuring method that proposes first ion current density under the AC/DC parallel circuit, its advantage is to measure the flip-flop and the alternating component of ground ion flow density, thus near the motion state of the space charge in ground under the reflection alternating current-direct current mixing electric field action; Native system can carry out the real-time continuous measurement to the ground ion current density in addition, helps the long-time online detection of AC/DC parallel line electricity magnetic environment.
The present invention successfully measures ground ion flow density under the alternating current-direct current joint line with ground ion flow density measurement system for AC/DC parallel powerline, and has taken into account direct current and alternating component wherein.
Electromagnetic environment monitor provided a kind of instrument near the present invention can be the AC/DC parallel circuit, and the while also provides a kind of means for the scientific research of AC/DC parallel circuit electromagnetic environment characteristic.
Description of drawings
Fig. 1 is that ground ion flow density measurement system for AC/DC parallel powerline of the present invention is formed synoptic diagram.
Fig. 2 is an ion flow plate schematic diagram of the present invention.
Fig. 3 is an ion flow plate output current signal oscillogram of the present invention.
Fig. 4 is an ion flow plate output current signal spectrogram of the present invention.
Fig. 5 is for adopting the AC/DC parallel powerline ground ion flow density measurement process flow diagram of system of the present invention.
Fig. 6 is an AC/DC parallel powerline ground ion flow density measurement method flow diagram of the present invention.
Embodiment
Ground ion flow density measurement system for AC/DC parallel powerline that the present invention proposes and measuring method thereof reach embodiment in conjunction with the accompanying drawings and are described in detail as follows:
General structure of the present invention comprises ion flow plate, oscillograph, has computing machine three parts of ion current density routine analyzer as shown in Figure 1, wherein:
This ion flow plate is used to receive the time-domain signal of the space charge of motion earthward;
This oscillograph is used for the time-domain signal that the ion flow plate obtains is sampled, and shows sampled signal, and sampled result is delivered to computing machine;
The computing machine that this stores the ion current density routine analyzer is used for the time-domain signal of the exchange current of described sampling is carried out Fourier transform, gets rid of the induction current part, analyzes the interchange, the flip-flop that obtain the measuring position ion current density.
The example structure and the function of each building block of the present invention are respectively described below:
Ion flow plate structure of the present invention as shown in Figure 2, form by dash receiver 1, shading ring 2, sampling resistor 3, dash receiver is a square metal plate, being insulated material and ground separates, and by sampling resistor ground connection, space charge moves to that the path through sheet metal, sampling resistor, ground forms electric current behind the dash receiver, can obtain this electric current by the voltage of measuring on the sampling resistor.The metallic shield ring that certain width is set around the dash receiver can reduce the ion flow plate to the distortion that electric field on every side causes, improves measuring accuracy.
When only having DC electric field, ion current density does not change in time, and the electric current that flows through sampling resistor is a direct current, promptly can read measurement data with reometer.But when external electric field is non-direct current, the signal that the ion flow plate measures is shown in curve a among Fig. 3, mainly comprise space AC field induction current, gas current flip-flop, gas current alternating component three parts in the signal, also may comprise the AC harmonic composition, mixed in together being difficult to of each composition analyzed.To measure current signal carries out Fourier transform and obtains its frequency spectrum, as shown in Figure 4, DC component in the corresponding frequency spectrum of gas current flip-flop, the alternating component of faradic alternating component and gas current and harmonic component thereof form a plurality of frequency peak (as the A among the figure-F), can obtain the different frequency component (by selecting suitable ion flow board size, sampling resistor resistance and current spectrum is counter to push away sub-current density different frequency component and calculate by measuring) of gas current to the analysis of each crest frequency and amplitude.
In one embodiment of the present of invention, ion flow plate shape as shown in Figure 2, dash receiver area S
p=0.0816m
2, shading ring width 5cm, sampling resistor 1M Ω.
The oscillograph of present embodiment is selected the TDS2024 digital storage oscilloscope of Tektronix company for use, is connected with computing machine by gpib interface.Measuring object is the reduced scale AC/DC parallel circuit model that set up in the laboratory, as shown in Figure 5 (change into Fig. 5 and number in the figure can not with used repetition among Fig. 3, please renumber not circle), use diameter 1.5mm iron wire as lead (1), conductor length 2.2m, two leads are arranged in parallel, height 80cm, spacing 40cm applies 16kV respectively at two leads, 50Hz alternating voltage (2) and 50kV DC voltage (3), measuring position (4) are on the ground of model center.
Use store the ion current density routine analyzer the computer control oscillograph, read sampled data, analyze data and obtain the ground ion flow density information.
Computing machine of the present invention can adopt general PC, requires more than the CPU frequency 1.8GHz, more than the internal memory 1G, WindowsXP operating system is installed.
The AC/DC parallel powerline ground ion flow density measurement method flow of the employing said system that the present invention proposes may further comprise the steps as shown in Figure 6:
(1) reads ion flow plate calibration data: need before the ion flow plate uses to calculate ion current density ρ (with μ A/m according to ion flow plate area
2Be unit) record electric current I with the ion flow plate
OutThe ratio C OEF of (is unit with μ A) is as calibration data, and deposits this calibration data in computing machine, reads when measuring beginning each; COEF=1/S in the present embodiment
p=12.255 (1/m
2).
(2) the oscillograph sample frequency is set: (should guarantee to cover main frequency spectrum when selecting the oscillograph sample frequency, guarantee enough frequency resolutions again) oscillograph sample frequency f
sSpan be:
10×f
h≤f
s≤5×N
s (1)
In the formula: f
hBe the 50Hz power frequency; N
sBe oscillograph sample frequency f in this example of oscillograph sampling number (being 2500 in the present embodiment) event
sRange of choice be 500Hz≤f
s≤ 12.5kHz, present embodiment is provided with f
s=5kHz, and by gpib interface oscillograph is provided with;
(3) sampled data is carried out spectrum analysis, the search peak frequency: the control oscillograph reads ion flow plate output signal, obtain time domain waveform (shown in curve a among Fig. 3), the time domain waveform of this signal is carried out fast fourier transform to be obtained frequency spectrum (shown in curve b among Fig. 4, frequency spectrum mainly constitutes (A-F)) by several peak values; Search the middle Local Extremum of frequency spectrum (curve b) of ion flow plate output signal, write down each crest frequency f
pWith peak amplitude I
pFoundation as subsequent analysis.
The frequency of peak A-F and amplitude are as follows in the present embodiment:
| Numbering | Crest frequency f p(Hz) | Amplitude I p(μA) |
| A | 50 | 0.190 |
| |
100 | 0.0147 |
| C | 150 | 0.0702 |
| D | 250 | 0.0173 |
| E | 350 | 0.0234 |
| F | 450 | 0.0710 |
(4) extract DC component, calculate ion current density flip-flop: (flip-flop and alternating component in the measuring-signal are handled respectively.Direct current signal amplitude height, and do not have harmonic problem) can multiply by calibration data again and obtain ion current density direct current amplitude by to asking average after the time domain waveform filtering earlier;
Time domain waveform mean value I in the present embodiment
p(0)=1.461 μ A, ground ion flow density DC component ρ (0)=I
p(0) * COEF=17.9 (μ A/m
2).
(5) carry out frequency analysis, calculate the ion current density alternating component: (alternating component in the measuring-signal is by the alternating-current field induction current and exchange gas current two parts and form, and the interchange gas current partly is to be measured, and the alternating-current field induction current needs filtering.Also have harmonic component in the measuring-signal frequency spectrum except that the 50Hz power frequency, because comparatively seriously and substantially there is not even-order harmonic in general transformer odd harmonic, the alternating current impression electric current only has contribution to odd harmonic.And exchange gas current for only in the semiperiod of interchange and direct current same polarity, value being arranged, half cycle is 0 semiperiod sine wave (this is because the ion flow plate only can receive electric charge and can not launch electric charge) in addition, because can occur the even-order harmonic of fundamental frequency in the frequency spectrum of half cycles signal, so even-order harmonic produces by exchanging gas current in the measuring-signal frequency spectrum).According to 100Hz harmonic component amplitude in the half cycle sine wave of frequency 50Hz and 50Hz fundamental voltage amplitude ratio is 0.4248, with power frequency 2 subharmonic in the measuring-signal frequency spectrum (being the 100Hz component) amplitude divided by 0.4248, obtain 50Hz and exchange the gas current amplitude, multiply by calibration data again, obtain 50Hz and exchange ion current density;
F in the present embodiment measuring-signal frequency spectrum
p(A)=50 (Hz) is the power frequency fundamental frequency, f
p(B)=2 * f
p(A) be even-order harmonic, f
p(C)=3 * f
p(A), f
p(D)=5 * f
p(A), f
p(E)=7 * f
p(A), f
p(F)=9 * f
p(A) be odd harmonic.The alternating current impression electric current only has contribution to odd harmonic peak values such as A, C, D, E, F among Fig. 4 spectrum curve b, and even-order harmonic peak value B is only relevant with the interchange gas current.So exchange gas current amplitude I in the measuring-signal
Pq(50)=I
p(100) * and 2.354=0.0346 (μ A), ground ion flow density AC compounent ρ (50)=I
Pq(50) * COEF=0.424 (μ A/m
2).
(6) ion storage current density frequency spectrum: the ion current density spectrum information that analysis is obtained is stored in the computing machine standby.
It is 17.9 μ A/m that the present embodiment analysis obtains ground ion flow density DC component
2The 50Hz AC compounent is 0.424 μ A/m
2
Claims (2)
1, a kind of ground ion flow density measurement system for AC/DC parallel powerline is characterized in that, this system mainly comprises ion flow plate, the oscillograph that links to each other successively and stores computing machine three parts of ion current density routine analyzer;
This ion flow plate is used to receive the time-domain signal of the space charge of motion earthward;
This oscillograph is used for the time-domain signal that the ion flow plate obtains is sampled, and shows sampled signal, and sampled result is delivered to computing machine;
The computing machine that this stores the ion current density routine analyzer is used for the time-domain signal of the exchange current of described sampling is carried out Fourier transform, gets rid of the induction current part, analyzes the interchange, the flip-flop that obtain the measuring position ion current density.
2, adopt the measuring method of the system as claimed in claim 1, it is characterized in that, may further comprise the steps:
(1) reads ion flow plate calibration data: need before the ion flow plate uses to record electric current I according to ion flow plate area calculating ion current density ρ and ion flow plate
OutRatio C OEF as calibration data, and deposit this calibration data in computing machine, read when measuring beginning each;
(2) the oscillograph sample frequency is set: oscillograph sample frequency f
sSpan be:
10×f
h≤f
s≤5×N
s
In the formula: f
hBe the 50Hz power frequency; N
sBe the oscillograph sampling number; And oscillograph is provided with by gpib interface;
(3) sampled data is carried out spectrum analysis, the search peak frequency: the control oscillograph reads ion flow plate output signal, obtains time domain waveform, the time domain waveform of this signal is carried out fast fourier transform obtain frequency spectrum; Search Local Extremum in the frequency spectrum of ion flow plate output signal, write down each crest frequency f
pWith peak amplitude I
pFoundation as subsequent analysis:
(4) extract DC component, calculate ion current density flip-flop:, multiply by calibration data again and obtain ion current density direct current amplitude by to asking average after the time domain waveform filtering earlier;
(5) carry out frequency analysis, calculate the ion current density alternating component: according to 100Hz harmonic component amplitude in the half cycle sine wave of frequency 50Hz and 50Hz fundamental voltage amplitude ratio is 0.4248, with power frequency 2 subharmonic in the measuring-signal frequency spectrum (being the 100Hz component) amplitude divided by 0.4248, obtain 50Hz and exchange the gas current amplitude, multiply by calibration data again, obtain 50Hz and exchange ion current density;
(6) ion storage current density frequency spectrum: the ion current density spectrum information that analysis is obtained is stored in the computing machine standby.
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| CN109782080A (en) * | 2019-01-08 | 2019-05-21 | 国网天津市电力公司电力科学研究院 | A kind of cable insulation space charge signal wireless transmission system |
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| CN110851990B (en) * | 2019-11-16 | 2022-12-06 | 中国舰船研究设计中心 | Method for predicting electromagnetic radiation interference of medium-voltage cable of ship |
| CN112444686A (en) * | 2020-08-24 | 2021-03-05 | 中国电力科学研究院有限公司 | Method for determining initial value of charge density of cross-domain direct current line |
| CN112444686B (en) * | 2020-08-24 | 2023-02-28 | 中国电力科学研究院有限公司 | Method for determining initial value of charge density of cross-over direct current line |
| CN114089050A (en) * | 2021-11-15 | 2022-02-25 | 清华大学 | Online measurement method and device for surface charge distortion electric field of GIS insulator |
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