CN102735325B - Audible noise calculating method for high-voltage direct current electric transmission line - Google Patents
Audible noise calculating method for high-voltage direct current electric transmission line Download PDFInfo
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- G—PHYSICS
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/30—Circuit design
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Abstract
The invention provides an audible noise calculating method for a high-voltage direct current electric transmission line of 4 to 8 bundle conducting wires and can effectively solve the audible noise prediction problem of an extra-high-voltage direct current electric transmission line. The calculating method comprises three parts that (1) the surface electric field intensity of the conducting of the high-voltage direct current electric transmission line is calculated; (2) the audible noise level (in summer) of the high-voltage direct current electric transmission line is calculated; and (3) the audible noise level of other seasons is obtained through adding or reducing correction items. The calculating method is simple, the implementation is easy, the audible noise of the direct current line corona of the 4 to 8 bundle conducting wires obtained through the calculation can be preferably coincided with the measuring results of testing line in China through being compared with calculation results of other formulas. The direct current corona audible noise of multiple conducting wires, obtained through calculation by the calculating method provided by the invention can more adapt to the environment climate condition in China. The audible noise calculating method is particularly suitable for the extra-high-voltage direct current corona audible noise calculation when during the 4 to 8 bundle conducting wire adoption in north China.
Description
Technical field
The invention belongs to the acquisition methods of audible noise in power domain, be specifically related to a kind of HVDC (High Voltage Direct Current) transmission line audible noise computing method of 4-8 split conductor.
Background technology
In order to meet sustainable development of socio-economy need for electricity, build the strategic objective that has become power construction taking high pressure, extra-high voltage grid as the reinforcement electrical network of core.In the time adopting long distance, large capacity transmission, UHV transmission can effectively be saved circuit and walk, and contributes to improve network structure, builds transmission of electricity bottleneck and realizes large-scale most optimum distribution of resources, and economic and social benefit is fairly obvious.Because electric pressure improves, the electromagnetic environment of extra-high voltage is different from 500kV circuit, if adopt the identical split conductor of 500kV, the environmental factors such as power frequency electric field, audible noise and the radio interference that circuit produces will become the restraining factors that affect line construction.
The electromagnetic environment problem of extra high voltage direct current transmission line is extra high voltage direct current transmission line design, construction and the key technical problem that must consider in service.China take the lead in the world research and in south successfully built ± 800kV extra-high voltage direct-current transmission engineering, and by further research and development ± 1100kV extra-high voltage direct-current transmission engineering.Along with the raising of DC transmission engineering electric pressure, the noise control of transmission line of electricity seems particularly important, and it has become one of conditionality factor determining in line construction and corridor.
A kind of people's ear that audible noise produces while being guide line surrounding air ionic discharge can direct audible noise.This noise may make near resident high-tension line or staff has the fidgets and uneasiness, audible noise is the same with radio interference, increase along with the increase of conductive line surfaces electric field intensity, but audible noise is than radio interference, along circuit, laterally decay is slow.External research shows, for 750kV and Above Transmission Lines, audible noise will become distinct issues.
The true type experimental study of the extra high voltage direct current transmission line of China and external correlative study achievement still can not meet the demand of China's engineering construction completely at present.For this reason, State Grid Corporation of China has built extra-high voltage direct-current test line segment, corona cage in Beijing, simulate the test facilities such as little line segment, to carry out relevant DC line audible noise experimental study, obtain applicable China's wire manufacturing process and many divisions of environmental quality, the audible noise characteristic rule of large-section lead.In conjunction with the audible noise test of corona cage inside conductor and test line segment wire, the characteristic rule of researching DC circuit audible noise.
The formula of at present China's prediction DC line audible noise derives from foreign study achievement mostly, and for the true type experimental study of the autonomous experimental study, particularly UHVDC Transmission Lines of China's wire in the starting stage.Along with developing rapidly of China's extra-high voltage grid, only rely on external achievement in research can not satisfy the demand completely.At present State Grid Corporation of China's Program Construction ± 1100kV extra high voltage direct current transmission line will use 8 split conductors, and existing U.S. EPRI DC line noise calculation formula is only applicable to 6 divisions with lower wire, BPA DC line noise calculation formula is also due to test line segment (road) division number with sample number is less causes that beating property of result of calculation is excessive, range of application is less.In addition, China's climatic environment, wire manufacturing technology and technique and also have difference abroad, external DC line noise calculation formula also needs research in the adaptability of China.For this reason, State Grid Corporation of China has built the test facilities such as extra-high voltage direct-current test line segment, corona cage and the little line segment of simulation in Beijing, carry out the experimental study of DC line audible noise, to obtain the audible noise predictor formula that is applicable to China's wire and environmental quality.
Summary of the invention
The comparatively problem of difficulty of transmission line of electricity audible noise prediction and calculation running into when flourish for solving China extra-high voltage direct-current transmission engineering, the invention provides a kind of HVDC (High Voltage Direct Current) transmission line audible noise computing method of 4-8 split conductor, the method can calculate the audible noise A sound level of position, 4-8 split conductor below easily and effectively; The noise being calculated by the present invention, can provide reference frame for the design of extra high voltage direct current transmission line, construction and operation.
For achieving the above object, the technical scheme that the present invention takes is:
A kind of HVDC (High Voltage Direct Current) transmission line audible noise computing method, its improvements are that described method comprises the steps:
1) the surface field intensity of calculating high voltage direct current split conductor
Adopt successively image method, obtain the electric field strength E i on the each sub-conductor of split conductor surface;
Wherein 1≤i≤n, i round numbers,
N is the division number of wire, 4≤n≤8;
Adopt the mean value method of each sub-conductor maximum field intensity, must characterize the electric field intensity numerical value E of conductive line surfaces corona discharge intensity;
In formula:
E
i-split the electric field intensity on the each sub-conductor of wire surface, kV/cm;
E
imax-split conductor sub-conductor maximum field intensity, kV/cm;
The surperficial maximum field strength of E-wire, kV/cm;
2) the audible noise A sound level while calculating circuit below summer
P＝k
0+k
1log(E)+k
2log(d)+k
3log(n)-10log(R)+ΔP （2）
Or
P＝k
0′+k
1′E+k
2′log(d)+k
3′log(n)-10log(R)+ΔP （3）
In formula:
P-at the audible noise sound pressure level of the position apart from circuit R, dB(A);
The surperficial maximum field strength of E-wire, kV/cm;
D-sub-conductor diameter, cm;
The division number of n-wire;
R-field point is to the distance of circuit, m;
Δ P-sound pressure level correction factor, comprises that seasonal effect correction, amblent air temperature impact are revised and height above sea level impact is revised, dB (μ W/m);
K
0, k
1, k
2, k
3; k
0', k
1', k
2', k
3the coefficient of '-each subitem;
3) obtain the audible noise A sound level in other seasons
When spring and autumn, Δ P gets-3.1～-1.6, and spring and autumn audible noise A sound level is:
P＝k
0+k
1log(E)+k
2log(d)+k
3log(n)-10log(R)-(1.6～3.1) （4）
Or
P＝k
0′+k
1′E+k
2′log(d)+k
3ˊlog(n)-10log(R)-(1.6～3.1) （5）
When winter, Δ P gets-7.4～-3.7, and winter, audible noise A sound level was:
P＝k
0+k
1log(E)+k
2log(d)+k
3log(n)-10log(R)-(3.7～7.4) （6）
Or
P＝k
0ˊ+k
1ˊE+k
2ˊlog(d)+k
3ˊlog(n)-10log(R)-(3.7～7.4) （7）
In formula, each alphabetical implication is with step 2).
Another optimal technical scheme of the present invention is: in described formula 2-6, every coefficient value scope is:
K
0span be-180～-100;
K
1span be 50～150;
K
2span be 50～100;
K
3span be 10～30;
K
0the span of ˊ is-80～-20;
K
1the span of ˊ is 1.5～2.2;
K
2the span of ˊ is 50～90;
K
3the span of ˊ is 15-30.
An optimal technical scheme more of the present invention is: in the step 1 of described method, obtain the electric field strength E on the each sub-conductor of split conductor surface
imethod be charge simulation method or finite element method.
Another optimal technical scheme of the present invention is: in the step 1 of described method, the method for obtaining the electric field intensity numerical value E that characterizes conductive line surfaces corona discharge intensity is maximum field intensity method or average field intensity method.
Another optimal technical scheme of the present invention is: be applicable to ± 800kV of described method extra-high voltage direct-current transmission engineering, ± 900kV extra-high voltage direct-current transmission engineering, ± 1000kV extra-high voltage direct-current transmission engineering and+the obtaining of 1100kV extra-high voltage direct-current transmission engineering audible noise.
Owing to having adopted technique scheme, compared with prior art, beneficial effect of the present invention comprises:
The HVDC (High Voltage Direct Current) transmission line audible noise computing method that the present invention relates to a kind of 4-8 split conductor, it comprises three parts: (1) calculates the surface field intensity of high voltage direct current wire; (2) by calculating the audible noise level (summer) under line; (3) obtain the audible noise level in other seasons by adding and subtracting a constant.
The present invention is simple, and the DC corona audible noise of the 4-8 split conductor calculating is better more identical than the measurement result of the result of calculation of other formula and China's test line segment; The DC corona audible noise of the multiple fission conductor that use the present invention calculates is more suitable for the amblent air temperature condition of China; Extra-high voltage direct-current corona audible noise when the present invention is especially applicable to being applied to northern China employing 4-8 split conductor calculates.
Brief description of the drawings
Below in conjunction with accompanying drawing, the present invention is further described.
Fig. 1 is 6 × 720mm
2the comparing result (conductive line surfaces field intensity is 22.04kV/cm) of the computing method that under the line of wire in the time of ± 800kV, audible noise measuring value and the present invention recommend;
Fig. 2 is 6 × 720mm
2the comparing result (conductive line surfaces field intensity is 24.8kV/cm) of the computing method that under the line of wire in the time of ± 900kV, audible noise measuring value and the present invention recommend;
Fig. 3 is 6 × 720mm
2the comparing result (conductive line surfaces field intensity is 27.55kV/cm) of the computing method that under the line of wire in the time of ± 1000kV, audible noise measuring value and the present invention recommend;
Fig. 4 is 6 × 720mm
2the comparing result (conductive line surfaces field intensity is 23.14kV/cm) of the computing method that under the line of wire in the time of+1000kV, audible noise measuring value and the present invention recommend;
Fig. 5 is 6 × 720mm
2the comparing result (conductive line surfaces field intensity is 25.45kV/cm) of the computing method that under the line of wire in the time of+1100kV, audible noise measuring value and the present invention recommend.
Embodiment
Below in conjunction with example, the present invention will be described in detail.
The invention provides a kind of high voltage direct current corona audible noise computing method of 4-8 split conductor, calculate the electric field intensity on high voltage direct current split conductor surface; The formula of recommending by the present invention calculates the audible noise level (summer) under line; By adding and subtracting the audible noise level of revising constant a season and obtain other seasons.
Below in conjunction with drawings and Examples, each several part content of the present invention is described in detail.
(1) the surface field intensity of calculating high voltage direct current split conductor
Useful several different methods is calculated the electric field intensity on split conductor surface, such as successively image method, charge simulation method, finite element method etc.Successively image method of recommendation of the present invention, but be not limited to the method.
Use certain electric Field Calculation method to obtain after the electric-field intensity distribution on each sub-conductor surface in split conductor, also need to calculate an electric field intensity numerical value that can be used for characterizing conductive line surfaces corona discharge intensity, the mean value of the each sub-conductor maximum field of recommendation of the present invention intensity represents, but be not limited to this amount, also can use maximum field intensity, average field intensity etc.
(2) formula of recommending by the present invention calculates the audible noise level (summer) under line
Through type 1) or 2) audible noise A sound level can calculate circuit below summer time.
P＝k
0+k
1log(E)+k
2log(d)+k
3log(n)-10log(R)+ΔP （1）
P＝k
0′+k
1′E+k
2′log(d)+k
3′log(n)-10log(R)+ΔP （2）
In formula
P---at the audible noise sound pressure level of the position apart from circuit R, dB(A);
The surperficial maximum field strength of E---wire, kV/cm;
D---sub-conductor diameter, cm;
The division number of n---wire;
R---a point arrives the distance of circuit, m;
K
0, k
1, k
2, k
3; k
0', k
1', k
2', k
3'---the coefficient of each subitem.
Δ P---sound pressure level correction factor, dB (μ W/m), comprises that seasonal effect correction, amblent air temperature impact are revised and height above sea level affects correction etc.
Wherein k
0span be-100--180, k
1span be 50-150, k
2span be 50-100, k
3span be 10-30; k
0' span be-20--80, k
1' span be 1.5-2.2, k
2' span be 50-90, k
3' span be 15-30.
(3) obtain the audible noise level in other seasons by deducting a constant
According to test findings, the audible noise test findings in summer is than the large 1.6～3.1dB of the test findings of spring and autumn, and than the large 3.7～7.4dB of the measurement result in winter.Therefore, the audible noise of spring and autumn is get-(1.6～3.1) dB of Δ P,, the audible noise in winter is get-(3.7～7.4) dB of Δ P.
Below taking State Grid Corporation of China be positioned at the extra-high voltage direct-current corona cage of Changping County, Beijing and the measurement result of test line segment audible noise measuring system as example illustrates effect of the present invention.
From year April in April, 2009 to 2011, audible noise test and the Research on Regularity of 1 year by a definite date in corona cage, have been carried out for conventional split conductor in 11 kinds of engineerings, taking these data as basis, carry out the audible noise experimental formula matching research of split conductor.And in conjunction with the test figure of the test line segment audible noise same period, this predictor formula is verified.On test line segment, set up 6 × 720mm
2wire, applies respectively ± 800kV, ± 900kV, and ± 1000kV ,+1000kV, the comparing result of the computing method that under line when+1100kV, audible noise measuring value and the present invention recommend is as shown in Fig. 1～5.Wherein, in Fig. 1-5, in the formula of computing method, every coefficient value is k
0=-149.79, k
1=103.72, k
2=79.18, k
3=24.37; k
0ˊ=-53.02, k
1ˊ=1.93, k
2ˊ=78.36, k
3ˊ=24.35, in figure, CEPRI logarithmic formula means in claim 1 in formula 2,4 and 6, figure that CEPRI linear formula means formula 3,5 and 7 in claim 1.Can be found out by Fig. 1～5, in the time that test line segment surface electric field intensity is higher (± 900kV, ± 1000kV ,+1100kV), the attenuation trend of audible noise measured result is consistent with the attenuation trend that adopts fitting formula to obtain, and fitting formula predicts the outcome less with the difference of measured result.In the time that test line segment surface electric field intensity is lower, near descending online, adopt fitting formula to predict that the result and the measured result that obtain are more identical; Along with the increase of positive wire distance, the fitting formula decay that predicts the outcome is very fast, and measured result decay is slower, this is that the noise hour being produced by wire due to conductive line surfaces field intensity is also less, noise measurement is subject to the impact of ground unrest.Along with the increase of positive wire distance, measured result decay is slower, illustrate that in measured result, ground unrest contribution is larger, and the audible noise level that reality is produced by wire should be lower than measured value.It is better that the audible noise computing method that the present invention proposes and measured value coincide.
Above-described embodiment is only for illustrating calculating effect of the present invention; its Chinese style 1) and formula 2) in coefficient all change with weather, pollution level etc.; every equivalents of carrying out on the basis of technical solution of the present invention and improvement, all should not get rid of outside protection scope of the present invention.
According to specific exemplary embodiment, invention has been described herein.It will be apparent under not departing from the scope of the present invention, carrying out to one skilled in the art suitable replacement or revise.Exemplary embodiment is only illustrative, instead of restriction to scope of the present invention, and scope of the present invention is defined by appended claim.
Claims (4)
1. HVDC (High Voltage Direct Current) transmission line audible noise computing method, is characterized in that described method comprises the steps:
1) the surface field intensity of calculating high voltage direct current split conductor
Adopt successively image method, obtain the electric field strength E on the each sub-conductor of split conductor surface
i;
Wherein 1≤i≤n, i round numbers,
N is the division number of wire, 4≤n≤8;
Adopt the mean value method of each sub-conductor maximum field intensity, obtain characterizing the electric field intensity numerical value E of conductive line surfaces corona discharge intensity;
In formula:
E
ithe electric field intensity on the each sub-conductor of-split conductor surface, kV/cm;
E
imax-split conductor sub-conductor maximum field intensity, kV/cm;
The surperficial maximum field strength of E-wire, kV/cm;
2) the audible noise A sound level while calculating circuit below summer
P＝k
0'+k
1'E+k
2'log(d)+k
3'log(n)-10log(R)+ΔP （2）
In formula:
P-at the audible noise sound pressure level of the position apart from circuit R, dB(A);
The surperficial maximum field strength of E-wire, kV/cm;
D-sub-conductor diameter, cm;
The division number of n-wire;
R-field point is to the distance of circuit, m;
Δ P-sound pressure level correction factor, comprises that seasonal effect correction, amblent air temperature impact are revised and height above sea level impact is revised, dB (A);
K
0', k
1', k
2', k
3the coefficient of '-each subitem;
3) obtain the audible noise A sound level in other seasons
When spring and autumn, Δ P gets-3.1～-1.6, and spring and autumn audible noise A sound level is:
P＝k
0ˊ+k
1ˊE+k
2ˊlog(d)+k
3ˊlog(n)-10log(R)-(1.6～3.1) （3）
When winter, Δ P gets-7.4～-3.7, and winter, audible noise A sound level was:
P＝k
0ˊ+k
1ˊE+k
2ˊlog(d)+k
3ˊlog(n)-10log(R)-(3.7～7.4) （4）
In formula, each alphabetical implication is with step 2);
In formula 2-4, every coefficient value scope is:
K
0the span of ˊ is-80～-20;
K
1the span of ˊ is 1.5～2.2;
K
2the span of ˊ is 50～90;
K
3the span of ˊ is 15～30.
2. a kind of HVDC (High Voltage Direct Current) transmission line audible noise computing method as claimed in claim 1, is characterized in that in the step 1) of described method, obtain the electric field strength E on the each sub-conductor of split conductor surface
imethod be charge simulation method or finite element method.
3. a kind of HVDC (High Voltage Direct Current) transmission line audible noise computing method as claimed in claim 1, it is characterized in that in the step 1) of described method, the method for obtaining the electric field intensity numerical value E that characterizes conductive line surfaces corona discharge intensity is maximum field intensity method or average field intensity method.
4. a kind of HVDC (High Voltage Direct Current) transmission line audible noise computing method as claimed in claim 1, it is characterized in that be applicable to ± 800kV of described method extra-high voltage direct-current transmission engineering, ± 900kV extra-high voltage direct-current transmission engineering, ± 1000kV extra-high voltage direct-current transmission engineering and+the obtaining of 1100kV extra-high voltage direct-current transmission engineering audible noise.
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| CN201210185387.3A CN102735325B (en) | 2012-06-06 | 2012-06-06 | Audible noise calculating method for high-voltage direct current electric transmission line |
| PCT/CN2013/075188 WO2013181977A1 (en) | 2012-06-06 | 2013-05-06 | Audible noise calculation method for high voltage dc power transmission line |
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|---|---|---|---|
| CN201210185387.3A CN102735325B (en) | 2012-06-06 | 2012-06-06 | Audible noise calculating method for high-voltage direct current electric transmission line |
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| CN112834022A (en) * | 2021-01-05 | 2021-05-25 | 华北电力大学（保定） | Method for calculating audible noise of cross crossing area of alternating-current transmission line |
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| US7447567B2 (en) * | 2003-11-04 | 2008-11-04 | Takeo Sonobe | Electric power system suppressing corona discharge from viewpoint of environment |
| US6963204B2 (en) * | 2004-04-06 | 2005-11-08 | International Business Machines Corporation | Method to include delta-I noise on chip using lossy transmission line representation for the power mesh |
| CN101378181A (en) * | 2008-09-30 | 2009-03-04 | 国网武汉高压研究院 | Method for reducing local audible noise of extra-high voltage AC line |
| CN102735325B (en) * | 2012-06-06 | 2014-07-23 | 中国电力科学研究院 | Audible noise calculating method for high-voltage direct current electric transmission line |
| CN102901555B (en) * | 2012-08-21 | 2014-12-03 | 中国电力科学研究院 | DC (direct current)-corona audible noise calculation method for 6*720 mm<2> wire |
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2012
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106707046A (en) * | 2015-07-15 | 2017-05-24 | 中国电力科学研究院 | DC transmission line audible noise altitude correction method |
| CN106707046B (en) * | 2015-07-15 | 2019-06-04 | 中国电力科学研究院 | A kind of DC power transmission line audible noise altitude correcting method |
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