CN103543358A - Method for defining attenuation effect of extra-high voltage transmission line and boundary on high frequency quantity - Google Patents
Method for defining attenuation effect of extra-high voltage transmission line and boundary on high frequency quantity Download PDFInfo
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- CN103543358A CN103543358A CN201310506651.3A CN201310506651A CN103543358A CN 103543358 A CN103543358 A CN 103543358A CN 201310506651 A CN201310506651 A CN 201310506651A CN 103543358 A CN103543358 A CN 103543358A
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 78
- 230000000694 effects Effects 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 17
- 230000001052 transient effect Effects 0.000 claims abstract description 35
- 238000000605 extraction Methods 0.000 claims description 6
- 230000001681 protective effect Effects 0.000 abstract 2
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Abstract
The invention relates to the technical field of extra-high voltage direct current transmission and relates to a method for defining the attenuation effect of an extra-high voltage transmission line and a boundary on high frequency quantity. The method comprises the steps of dividing a high frequency transient state signal obtained after the extra-high voltage direct current transmission line with a length of X reaches a protective device by a high frequency transient state signal of a fault point on a direct current line according to the high frequency transient state signal of the fault point on the direct current circuit, and obtaining attenuation of the extra-high voltage transmission line on the high frequency quantity (please find the formula in the specification) by conducting a modulus operation; then dividing a high frequency transient state signal obtained after the extra-high voltage direct current transmission line boundary reaches a protective device by a high frequency transient state signal of a fault point on a direct current bus according to the high frequency transient state signal of the fault point on the direct current bus, and obtaining attenuation of the extra-high voltage transmission line boundary on the high frequency quantity (please find the formula in the specification) by conducting the modulus operation; finally achieving the definition on the attenuation effects of the extra-high voltage transmission line and the boundary on the high frequency quantity according to the relation between the attenuation. According to the method, the attenuation effects of the extra-high voltage transmission line and the boundary on the high frequency quantity can be effectively defined.
Description
Technical Field
The invention relates to a method for defining the attenuation effect of an extra-high voltage direct current transmission line and a boundary on high frequency quantity, and belongs to the technical field of extra-high voltage direct current transmission.
Background
At present, the attenuation characteristics of the known extra-high voltage direct current transmission line and the boundary to the high-frequency component of the fault transient signal are as follows: the extra-high voltage direct current transmission line has an attenuation effect on high frequency quantity, and the longer the line is, the stronger the attenuation effect is; the ultra-high voltage direct current transmission line side boundary formed by the smoothing reactor, the direct current filter and the PLC filter has strong attenuation effect on high frequency quantity. Is the attenuation of the same high frequency transient signal, of the line or the boundary great? No clear definition has been given at present. It is necessary to research the definition method of the attenuation effect of the extra-high voltage direct current transmission line and the boundary on the high frequency quantity.
Disclosure of Invention
The invention provides a method for defining the attenuation effect of an extra-high voltage direct current transmission line and a boundary on a high frequency quantity, which is used for solving the problem of defining the attenuation effect of the extra-high voltage direct current transmission line and the boundary on the high frequency quantity.
The technical scheme of the invention is as follows: a method for defining attenuation effect of extra-high voltage DC transmission line and boundary on high frequency quantity includes such steps as generating high-frequency transient signal of fault point on DC transmission lineA passage length ofxHigh-frequency transient signal after ultra-high voltage direct current transmission line reaches protection device
High frequency transient signal associated with fault point on DC line
The attenuation of the extra-high voltage direct current transmission line to the high frequency quantity is obtained by the way of phase division and modulus extraction(ii) a Then, high-frequency transient signals of fault points of the direct current bus are utilized
High-frequency transient signal after reaching the protection device through the boundary of the extra-high voltage direct current transmission line
High-frequency transient signal of fault point of direct-current bus
The attenuation of the extra-high voltage direct current transmission boundary to high frequency quantity is obtained by the way of phase division and modulus extraction
(ii) a Finally according to
Andthe size relationship between the two components realizes the definition of the attenuation effect of the extra-high voltage direct current transmission line and the boundary on the high frequency quantity.
Said according to
And
the method for defining the attenuation effect of the extra-high voltage direct-current transmission line and the boundary on the high frequency quantity by the size relationship is as follows:
when in use
If so, the attenuation of the line is smaller than that of the boundary;
when in use
If so, then the attenuation of the line is equal to the attenuation of the boundary;
when in useIf so, the attenuation of the line is larger than that of the boundary;
in the formula:xthe length of the extra-high voltage direct current transmission line,
for transmission coefficient of extra-high voltage DC transmission line
The real part of (a) is,the amplitude of the transfer function of the boundary of the extra-high voltage direct current transmission line.
The working principle of the invention is as follows:
knowing the geometric size, distribution and position of the wires, the tower structure and the like of the extra-high voltage direct current transmission line, the phase-mode frequency variation parameters of the line can be calculated, and the line propagation coefficient of the line can be obtained
(ii) a By utilizing the parameters of the smoothing reactor, the direct current filter and the PLC filter, the transfer function of the boundary of the ultra-high voltage direct current transmission line formed by the smoothing reactor, the direct current filter and the PLC filter can be obtained.
For the protection device installed on the rectifying side, the high-frequency components of transient voltage generated by the fault of a direct-current bus on the rectifying side of the extra-high voltage direct-current system reach the installation position of the protection device after being attenuated by the boundary of the extra-high voltage direct-current transmission line; transient voltage high-frequency components generated by faults of the extra-high voltage direct current transmission line reach the installation position of the protection device after being attenuated by the extra-high voltage direct current transmission line, and the longer the line is, the stronger the attenuation is.
The attenuation effect on the high frequency quantity of the boundary and the line of the inversion side is equal to that of the rectification side.
Amplitude of boundary transfer function of extra-high voltage direct current transmission line
The attenuation characteristic of the boundary to the high frequency quantity can be represented, and the attenuation of the extra-high voltage direct current transmission line to the high frequency quantity is determined by the attenuation coefficient of the extra-high voltage direct current transmission line
(taking the line propagation coefficientObtaining attenuation coefficient of the extra-high voltage direct current transmission line by the real part
) And line lengthxAnd (6) determining. So that the attenuation coefficient of the extra-high voltage direct current transmission line is utilized
And the magnitude of the boundary transfer function
The boundary and length of the extra-high DC transmission line can be defined asxThe attenuation effect of the extra-high direct current transmission line on high frequency quantity is large.
The invention has the beneficial effects that: the attenuation effect of the ultrahigh direct current transmission line and the boundary on high frequency quantity can be effectively defined.
Drawings
FIG. 1 is a schematic structural view of the present invention;
the reference numbers in the figures are: the inverter-side ac system includes a rectifier-side ac system 1, a rectifier bridge 2, a rectifier-side protection device 3, a dc line 4, an inverter bridge 5, an inverter-side ac system 6, a rectifier-side smoothing reactor 7, an inverter-side smoothing reactor 8, a rectifier-side dc filter 9, an inverter-side dc filter 10, a rectifier-side PLC filter 11, an inverter-side PLC filter 12, a rectifier-side grounding device 13, and an inverter-side grounding device 14.
Detailed Description
Example 1: as shown in FIG. 1, a method for defining attenuation effect of extra-high voltage DC transmission line and boundary on high frequency quantity includes firstly, according to high frequency transient signal of fault point on DC transmission line
A passage length ofxHigh-frequency transient signal after ultra-high voltage direct current transmission line reaches protection device
High frequency transient signal associated with fault point on DC line
The attenuation of the extra-high voltage direct current transmission line to the high frequency quantity is obtained by the way of phase division and modulus extraction(ii) a Then, high-frequency transient signals of fault points of the direct current bus are utilized
High-frequency transient state after reaching a protection device through boundary of extra-high voltage direct current transmission lineSignal
High-frequency transient signal of fault point of direct-current bus
The attenuation of the extra-high voltage direct current transmission boundary to high frequency quantity is obtained by the way of phase division and modulus extraction
(ii) a Finally according to
And
the size relationship between the two components realizes the definition of the attenuation effect of the extra-high voltage direct current transmission line and the boundary on the high frequency quantity.
Said according to
And
the method for defining the attenuation effect of the extra-high voltage direct-current transmission line and the boundary on the high frequency quantity by the size relationship is as follows:
when in use
If so, the attenuation of the line is smaller than that of the boundary;
when in use
If so, then the attenuation of the line is equal to the attenuation of the boundary;
when in useIf so, the attenuation of the line is larger than that of the boundary;
in the formula:xthe length of the extra-high voltage direct current transmission line,
for transmission coefficient of extra-high voltage DC transmission line
The real part of (a) is,
the amplitude of the transfer function of the boundary of the extra-high voltage direct current transmission line.
Example 2: as shown in figure 1, in the method for defining the attenuation effect of the extra-high voltage direct current transmission line and the boundary on the high frequency quantity, the rectifying side smoothing reactor 7, the rectifying side direct current filter 9 and the rectifying side PLC filter 11 form the rectifying side boundary of the extra-high voltage direct current transmission line, and the fault point on the direct current transmission lined 2A line length with the rectifying side protection device 3 is
. Set up as the fault point of the direct current bus at the rectification sided 1And a point of failure on the DC line 4d 2The high-frequency transient signal is the same high-frequency transient signalFault point on the dc line 4d 2Is/are as follows
A passage length ofxAfter the extra-high voltage direct current transmission line reaches the rectifying side protection device 3, the high-frequency transient signal is changed into a high-frequency transient signal
(ii) a Direct current bus fault point on rectifying sided 1Is/are as follows
The high-frequency transient signal is changed into a high-frequency transient signal after the high-frequency transient signal reaches a rectifying side protection device 3 through the rectifying side boundary of the extra-high voltage direct current transmission line
Then there is ；
(ii) a Will be provided with
And
left and right are respectively divided to obtainxAnd
the relationship between: when the length of the extra-high voltage direct current transmission linexIs less thanWhen the line pair frequency is
The attenuation of high frequency quantities will be less than that of the boundary; when the length of the extra-high voltage direct current transmission linexIs equal toWhen the line pair frequency isThe attenuation of the high frequency quantity will be equal to the attenuation of the boundary; when the length of the extra-high voltage direct current transmission linexIs greater than
When the line pair frequency is
The attenuation of high frequency quantities will be greater than that of the boundary. Wherein,xis a failure pointd 2A line length with the rectifying side protection device 3 isx，Is the real part of the transmission coefficient of the extra-high voltage direct current transmission line, namely the attenuation coefficient,
the amplitude of the transfer function of the boundary of the extra-high voltage direct current transmission line.
In addition, the definition process of the attenuation effect of the inversion side boundary and the line on the high frequency amount is the same as that of the rectification side boundary and the line on the high frequency amount in the above embodiment 2.
While the present invention has been described in detail with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Claims (2)
1. A method for defining the attenuation effect of an extra-high voltage direct current transmission line and a boundary on high frequency quantity is characterized by comprising the following steps: firstly, according to the high-frequency transient signal of fault point on DC line
A passage length ofxHigh-frequency transient signal after ultra-high voltage direct current transmission line reaches protection device
High frequency transient signal associated with fault point on DC line
The attenuation of the extra-high voltage direct current transmission line to the high frequency quantity is obtained by the way of phase division and modulus extraction
(ii) a Then, high-frequency transient signals of fault points of the direct current bus are utilized
High-frequency transient signal after reaching the protection device through the boundary of the extra-high voltage direct current transmission lineHigh-frequency transient signal of fault point of direct-current bus
The attenuation of the extra-high voltage direct current transmission boundary to high frequency quantity is obtained by the way of phase division and modulus extraction
(ii) a Finally according toAnd
the size relationship between the two components realizes the definition of the attenuation effect of the extra-high voltage direct current transmission line and the boundary on the high frequency quantity.
2. The method for defining the attenuation effect of the extra-high voltage direct current transmission line and the boundary on the high frequency quantity according to claim 1 is characterized in that: said according to
And
the method for defining the attenuation effect of the extra-high voltage direct-current transmission line and the boundary on the high frequency quantity by the size relationship is as follows:
when in useIf so, the attenuation of the line is smaller than that of the boundary;
when in use
If so, then the attenuation of the line is equal to the attenuation of the boundary;
when in use
If so, the attenuation of the line is larger than that of the boundary;
in the formula:xthe length of the extra-high voltage direct current transmission line,
for transmission coefficient of extra-high voltage DC transmission line
The real part of (a) is,
the amplitude of the transfer function of the boundary of the extra-high voltage direct current transmission line.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310506651.3A CN103543358B (en) | 2013-10-24 | 2013-10-24 | A kind of extra high voltage direct current transmission line and the border confining method to high frequency content attenuation size |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310506651.3A CN103543358B (en) | 2013-10-24 | 2013-10-24 | A kind of extra high voltage direct current transmission line and the border confining method to high frequency content attenuation size |
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| CN103543358A true CN103543358A (en) | 2014-01-29 |
| CN103543358B CN103543358B (en) | 2016-08-17 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0915292A (en) * | 1995-06-28 | 1997-01-17 | Chubu Electric Power Co Inc | Transmission and distribution line fault detector |
| CN201191311Y (en) * | 2008-05-15 | 2009-02-04 | 国网武汉高压研究院 | Transient characteristic experiment apparatus of ultra-high-voltage current transducer |
| CN101860020A (en) * | 2010-06-04 | 2010-10-13 | 昆明理工大学 | Method of boundary element utilizing polar wave S transform energy ratio to determine ultra high-voltage direct current transmission line fault |
| US20110148430A1 (en) * | 2008-08-29 | 2011-06-23 | Abb Research Ltd. | Method and apparatus for fault identification in a power tansmission line |
| CN102654552A (en) * | 2012-04-16 | 2012-09-05 | 昆明理工大学 | Method for protecting transient voltages at two terminals of super-high voltage direct current transmission line |
-
2013
- 2013-10-24 CN CN201310506651.3A patent/CN103543358B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0915292A (en) * | 1995-06-28 | 1997-01-17 | Chubu Electric Power Co Inc | Transmission and distribution line fault detector |
| CN201191311Y (en) * | 2008-05-15 | 2009-02-04 | 国网武汉高压研究院 | Transient characteristic experiment apparatus of ultra-high-voltage current transducer |
| US20110148430A1 (en) * | 2008-08-29 | 2011-06-23 | Abb Research Ltd. | Method and apparatus for fault identification in a power tansmission line |
| CN101860020A (en) * | 2010-06-04 | 2010-10-13 | 昆明理工大学 | Method of boundary element utilizing polar wave S transform energy ratio to determine ultra high-voltage direct current transmission line fault |
| CN102654552A (en) * | 2012-04-16 | 2012-09-05 | 昆明理工大学 | Method for protecting transient voltages at two terminals of super-high voltage direct current transmission line |
Non-Patent Citations (1)
| Title |
|---|
| 陈仕龙等: "一种特高压直流输电线路单端电压暂态保护原理", 《电力系统保护与控制》 * |
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