CN202513564U - Single-ended transient voltage protection device of ultra-high voltage direct current (DC) transmission line - Google Patents
Single-ended transient voltage protection device of ultra-high voltage direct current (DC) transmission line Download PDFInfo
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- CN202513564U CN202513564U CN2012200849128U CN201220084912U CN202513564U CN 202513564 U CN202513564 U CN 202513564U CN 2012200849128 U CN2012200849128 U CN 2012200849128U CN 201220084912 U CN201220084912 U CN 201220084912U CN 202513564 U CN202513564 U CN 202513564U
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Abstract
The utility model relates to a single-ended transient voltage protection device of an ultra-high voltage DC transmission line, which belongs to the technical field of ultra-high voltage DC transmission. According to the single-ended transient voltage protection device of the utility model, at a rectifier side, a smoothing reactor, a DC filter and a PLC filter of the rectifier side are adopted to form a ''boundary'' of the ultra-high voltage DC transmission line of the rectifier side; at an inverter side, a smoothing reactor, a DC filter and a PLC filter of the inverter side are adopted to form a ''boundary'' of the ultra-high voltage DC transmission line of the inverter side. The single-ended transient voltage protection device of the utility model can realize full-line protection of the ultra-high voltage DC transmission line, enabling a novel ultra-high voltage DC transmission line protection principle; and further, the single-ended transient voltage protection device is of great significance to safe operation of ultra-high voltage DC transmission systems.
Description
Technical field
The utility model relates to the single-ended transient voltage protective device of a kind of extra high voltage direct current transmission line, belongs to the extra-high voltage direct-current transmission technical field.
Background technology
At present, the main protection of known DC power transmission line is traveling-wave protection, but traveling-wave protection is subject to the interference of transition effects such as thunder and lightning, commutation failure, AC side fault, and reliability is not high.For the extra high voltage direct current transmission line transient protection; The extra high voltage direct current transmission line " border " that has the scholar to propose to utilize smoothing reactor, DC filter to constitute is distinguished interior, external area error; This method has proposed " border " notion; Significant, but this method has been ignored the attenuation of extra high voltage direct current transmission line to the high frequency transient signal, does not consider the effect of PLC filter; And this method is to utilize that protection component is distinguished outside this lateral areas, troubles inside the sample space, can not realize that extra high voltage direct current transmission line protects completely.
Summary of the invention
Not high in order to overcome existing extra high voltage direct current transmission line traveling-wave protection reliability; Utilize that protection component is distinguished outside this lateral areas, the extra high voltage direct current transmission line transient protection of troubles inside the sample space can not be realized the shortcoming that extra high voltage direct current transmission line is protected completely; The utility model provides a kind of extra high voltage direct current transmission line single-ended transient voltage protective device; This method reliability is high, and can realize that extra high voltage direct current transmission line protects completely.
The utility model solves this technical problem the technical scheme that is adopted: utilize smoothing reactor 7, DC filter 9, PLC filter 11 to constitute the extra high voltage direct current transmission line " border " of rectification side in the rectification side; Utilize smoothing reactor 8, DC filter 10, PLC filter 12 to constitute the extra high voltage direct current transmission line " border " of inversion side in the inversion side.
The utility model is considered the attenuation of extra high voltage direct current transmission line to fault transient signal high frequency content; Utilize protection component distinguish to outside the lateral areas, troubles inside the sample space; Concrete grammar is: at first, utilize smoothing reactor 7, DC filter 9, PLC filter 11 to constitute the extra high voltage direct current transmission line " border " of rectification side in the rectification side; Utilize smoothing reactor 8, DC filter 10, PLC filter 12 to constitute the extra high voltage direct current transmission line " border " of inversion side in the inversion side; In protection mounting points 3, utilize formula
then
Calculate when line end breaks down transient state energy in protection mounting points 3 detected fault transient voltage high fdrequency components, and as the standard of judging; When fault appears in certain point in the circuit; In protection mounting points 3, utilize formula
When calculating this point failure at the transient state energy of protection mounting points detected transient voltage high fdrequency component; The size of the transient state energy of the fault transient voltage high fdrequency component when transient state energy through fault transient voltage high fdrequency component relatively and line end fault at last; Distinguish extra high voltage direct current transmission line troubles inside the sample space completely and the external area error of protecting mounting points 3 offsides, realize extra high voltage direct current transmission line single-ended all fronts protection.
The comparative approach of the transient state energy of the fault transient voltage high fdrequency component the when transient state energy of described fault transient voltage high fdrequency component and line end fault: utilize rectification side protection component to distinguish the troubles inside the sample space and the external area error of inversion side, utilize the protection component of inversion side to distinguish the troubles inside the sample space and the external area error of rectification side; If protective device is positioned at the rectification side; Be standard in protection mounting points 3 detected fault transient voltage high fdrequency components during with the line end point failure; Fault transient voltage high fdrequency component when protecting mounting points 3 detected fault transient voltage high fdrequency components less than the line end point failure, then fault is the offside external area error; Fault transient voltage high fdrequency component when protecting mounting points 3 detected fault transient voltage high fdrequency components more than or equal to the line end point failure, then fault is the offside troubles inside the sample space.If protective device is positioned at the inversion side; Be standard in protection mounting points 3 detected fault transient voltage high fdrequency components during with the line end point failure; Fault transient voltage high fdrequency component when protecting mounting points 3 detected fault transient voltage high fdrequency components less than the line end point failure, then fault is the offside external area error; Fault transient voltage high fdrequency component when protecting the detected fault transient voltage of mounting points high fdrequency component more than or equal to the line end point failure, then fault is the offside troubles inside the sample space.
Described smoothing reactor, DC filter, PLC filter all are commercially available common components.
The beneficial effect of the utility model is: utilize the protective device of protection installation place, can distinguish the external area error and the DC power transmission line all fronts fault (troubles inside the sample space) of offside, thereby the realization extra high voltage direct current transmission line is protected completely.
Description of drawings
Distinguish outside this lateral areas, the extra high voltage direct current transmission line transient protection schematic diagram of troubles inside the sample space by protection component in order to utilize in the existing technology for Fig. 1;
Fig. 2 for the utility model utilize protection component distinguish to outside the lateral areas, the single-ended transient voltage protection philosophy of the extra high voltage direct current transmission line figure of troubles inside the sample space.
Among the figure: 1-rectification top-cross streaming system, 2-rectifier bridge, 3-protection mounting points, 4-DC line, 5-inverter bridge, 6-inversion top-cross streaming system, 7-rectification side smoothing reactor, 8-inversion side smoothing reactor, 9-rectification side DC filter, 10-inversion side DC filter, 11-rectification side PLC filter, 12-inversion side PLC filter.
Embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is further specified.
As shown in Figure 1: at present domestic scholars proposes utilizes that protection component is distinguished this lateral areas outside, the extra high voltage direct current transmission line transient protection schematic diagram of troubles inside the sample space, utilizes the extra high voltage direct current transmission line " border " of smoothing reactor 7, DC filter 9 formation rectification sides in the rectification side; " border " composed component that utilizes smoothing reactor 8, DC filter 10 to constitute this extra high voltage direct current transmission line of extra high voltage direct current transmission line " border " of inversion side in the inversion side does not comprise the PLC filter; And this protection philosophy is not considered the attenuation of extra high voltage direct current transmission line to fault transient signal high frequency content, and this protection is to utilize the protection of the extra high voltage direct current transmission line transient voltage of fault transient voltage.
Visible by Fig. 1; When the d3 point breaks down outside the district; Fault transient voltage signal high frequency content arrives the protection mounting points through " border " that is made up of smoothing reactor, DC filter; The detected fault transient voltage signal of protective device high frequency content is the high frequency content after decaying through " border "; And d1 point is when breaking down in the district, and the detected fault transient voltage signal of protective device high frequency content be the high frequency content without decay, is no problem so this principle is distinguished " in the district " and " outside distinguishing " of d1 point failure and d3 point failure.But; When extra high voltage direct current transmission line far-end d2 point breaks down, be the high frequency content after the extra high voltage direct current transmission line decay because extra high voltage direct current transmission line, arrives the fault transient voltage signal high frequency content of protection mounting points to the attenuation of high frequency content; And circuit is long more; It is more severe to decay, when the distance of fault point distance protection mounting points arrives to a certain degree, in the protection mounting points; The fault transient voltage high frequency content that the d2 point failure produces in the district will be less than the fault transient voltage high frequency content of the outer d3 point failure generation in district, and promptly this principle can not have been distinguished " in the district " and " outside the district " of d2 point failure and d3 point failure.So all fronts that protection component is distinguished outside this lateral areas, the extra high voltage direct current transmission line transient protection principle of troubles inside the sample space can not realize extra high voltage direct current transmission line that utilize that domestic scholars proposes are at present protected.
Overcoming on the basis of deficiency of the prior art; The utility model provides the single-ended transient voltage protective device of a kind of extra high voltage direct current transmission line; The operation principle of the utility model: for the protective device that is installed in the rectification side; The dual decay that the transient voltage high fdrequency component that the external area error of inversion side produces will be passed through extra high voltage direct current transmission line " border " and extra high voltage direct current transmission line could arrive the protection installation place, and troubles inside the sample space is that the transient voltage high fdrequency component that the extra high voltage direct current transmission line fault is produced then only just can arrive the protection installation place through the decay of extra high voltage direct current transmission line.It is thus clear that in rectification side protection installation place; The transient voltage high fdrequency component that the extra high voltage direct current transmission line end fault is produced is the transient voltage high fdrequency component that produces greater than external area error; Fault is near more from rectification side protection installation place, and the transient voltage high fdrequency component that is produced is big more.So, utilize the protective device of rectification side, calculate the transient state energy of transient voltage high fdrequency component and just can distinguish the fault of extra high voltage direct current transmission line all fronts and the external area error of inversion side.
The utility model utilizes smoothing reactor 7, DC filter 9, PLC filter 11 to constitute the extra high voltage direct current transmission line " border " of rectification side in the rectification side in force; Utilize smoothing reactor 8, DC filter 10, PLC filter 12 to constitute the extra high voltage direct current transmission line " border " of inversion side in the inversion side.
The utility model is when work; In protection mounting points 3, utilize formula
Calculate when line end breaks down transient state energy in protection mounting points 3 detected fault transient voltage high fdrequency components, and as the standard of judging; When fault appears in certain point in the circuit; In protection mounting points 3, utilize formula
When calculating this point failure at the transient state energy of protection mounting points detected transient voltage high fdrequency component; The size of the transient state energy of the fault transient voltage high fdrequency component when transient state energy through fault transient voltage high fdrequency component relatively and line end fault at last; Distinguish extra high voltage direct current transmission line troubles inside the sample space completely and the external area error of protecting mounting points 3 offsides, realize extra high voltage direct current transmission line single-ended all fronts protection.
The comparative approach of the transient state energy of the fault transient voltage high fdrequency component the when transient state energy of described fault transient voltage high fdrequency component and line end fault: when the fault transient voltage high fdrequency component of fault transient voltage high fdrequency component during less than the line end fault, then fault is the offside external area error; When the fault transient voltage high fdrequency component of fault transient voltage high fdrequency component during more than or equal to the line end fault, then fault is the offside troubles inside the sample space.
Be illustrated in figure 2 as that the utility model proposes utilize protection component distinguish to outside the lateral areas, the single-ended transient voltage protection philosophy of the extra high voltage direct current transmission line figure of troubles inside the sample space; When the d3 point breaks down outside the district; The dual decay that the transient voltage high fdrequency component of fault generating will be passed through extra high voltage direct current transmission line " border " and extra high voltage direct current transmission line could arrive the protection installation place; The transient voltage high fdrequency component that line end d2 point failure is produced in the district then only just can arrive the protection installation place through the decay of extra high voltage direct current transmission line; It is thus clear that in the protection mounting points; The fault transient voltage high frequency content that the d2 point failure produces in the district will be greater than the fault transient voltage high frequency content of the outer d3 point failure generation in district, and promptly present principles can be distinguished " in the district " and " outside the district " of d2 point failure and d3 point failure.Extra high voltage direct current transmission line is to the attenuation of fault transient signal high frequency content and the distance dependent of fault point distance protection mounting points; Distance is near more; Attenuation is more little; The d1 point failure fault transient voltage signal high frequency content that the d3 point failure produces outside line end d2 point, the district in the fault transient voltage signal high frequency content ratio district that the protection mounting points produces is much bigger in the district, and visible present principles can be distinguished " in the distinguishing " and " district is outer " of d1 point failure and d3 point failure.
The distance of d1 point d2 point failure distance protection mounting points in the utility model can also be distinguished; If protective device is positioned at the rectification side; Be standard in protection mounting points detected fault transient voltage high fdrequency component during with line end
point failure; Fault transient voltage high fdrequency component when protecting mounting points 3 detected fault transient voltage high fdrequency components less than line end
point failure, then fault is the offside external area error; Fault transient voltage high fdrequency component when protecting mounting points 3 detected fault transient voltage high fdrequency components more than or equal to line end
point failure; Then fault is the offside troubles inside the sample space; The detected fault transient voltage of protection mounting points high frequency content is big more; The fault point is near more apart from rectification side protection mounting points 3, otherwise just far away more.If protective device is positioned at the inversion side; Be standard in protection mounting points 3 detected fault transient voltage high fdrequency components during with line end
point failure; Fault transient voltage high fdrequency component when protecting mounting points 3 detected fault transient voltage high fdrequency components less than line end
point failure, then fault is the offside external area error; Fault transient voltage high fdrequency component when protecting mounting points 3 detected fault transient voltage high fdrequency components more than or equal to line end
point failure; Then fault is the offside troubles inside the sample space; The detected fault transient voltage of protection mounting points high frequency content is big more; The fault point is near more apart from inversion side protection mounting points 3, otherwise just far away more.
So, the utility model proposes utilize protection component distinguish to outside the lateral areas, the single-ended transient voltage protection philosophy of extra high voltage direct current transmission line of troubles inside the sample space can realize that extra high voltage direct current transmission line protects completely.
The utility model describes through the practical implementation process; Under the situation that does not break away from the utility model scope; Can also carry out various conversion and be equal to replacement the utility model patent; Therefore, the utility model patent is not limited to disclosed practical implementation process, and should comprise the whole embodiments that fall in the utility model Patent right requirement scope.
Claims (1)
1. the single-ended transient voltage protective device of extra high voltage direct current transmission line is characterized in that: utilize smoothing reactor, DC filter, the PLC filter of rectification side to constitute the extra high voltage direct current transmission line " border " of rectification side in the rectification side; Utilize smoothing reactor, DC filter, the PLC filter of inversion side to constitute the extra high voltage direct current transmission line " border " of inversion side in the inversion side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200849128U CN202513564U (en) | 2012-03-08 | 2012-03-08 | Single-ended transient voltage protection device of ultra-high voltage direct current (DC) transmission line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200849128U CN202513564U (en) | 2012-03-08 | 2012-03-08 | Single-ended transient voltage protection device of ultra-high voltage direct current (DC) transmission line |
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| CN202513564U true CN202513564U (en) | 2012-10-31 |
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| CN2012200849128U Expired - Fee Related CN202513564U (en) | 2012-03-08 | 2012-03-08 | Single-ended transient voltage protection device of ultra-high voltage direct current (DC) transmission line |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108808634A (en) * | 2018-04-10 | 2018-11-13 | 天津大学 | HVDC transmission line longitudinal protection method based on smoothing reactor voltage |
-
2012
- 2012-03-08 CN CN2012200849128U patent/CN202513564U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108808634A (en) * | 2018-04-10 | 2018-11-13 | 天津大学 | HVDC transmission line longitudinal protection method based on smoothing reactor voltage |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121031 Termination date: 20150308 |
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| EXPY | Termination of patent right or utility model |