CN102654552A - Method for protecting transient voltages at two terminals of super-high voltage direct current transmission line - Google Patents
Method for protecting transient voltages at two terminals of super-high voltage direct current transmission line Download PDFInfo
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Abstract
The invention relates to a method for protecting transient voltages at two terminals of a super-high voltage direct current transmission line and belongs to the technical field of super-high voltage direct current transmission. The method utilizes protection devices of rectification side and inversion side to calculate and compare the transient energy of the transient voltage high-frequency components which are detected at the rectification side and the inversion side and then judges whether the failure is close to the rectification side or close to the inversion side. If the failure is judged to be close to the inversion side, the protection device at the rectification side is utilized to distinguish all-line failure of the super-high voltage direct current transmission line and external failure at the inversion side. If the failure is judged to be close to the rectification side, the protection device at the inversion side is utilized to distinguish all-line failure of the super-high voltage direct current transmission line and external failure at the rectification side. The method can truly realize all-line protection of the super-high voltage direct current transmission line, is a brand new super-high voltage direct current transmission line protection principle and is of great significance to safe operation of super-high voltage direct current transmission systems.
Description
Technical field
The present invention relates to the guard method of a kind of extra high voltage direct current transmission line both-end transient voltage, belong 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, when high resistance ground, has the shortcoming of insufficient sensitivity.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 wave filter; And this method is to utilize that protecting 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.
The inventor has proposed the single-ended transient voltage guard method of a kind of extra high voltage direct current transmission line; This method utilize protecting component distinguish to outside the lateral areas, troubles inside the sample space; " district the is outer " fault of this method ability distinguishing protection mounting points offside and extra-high voltage direct-current transmission " district is interior " fault completely; Can realize all fronts protection of protection mounting points offside, but this method does not propose how failure judgement is protection this side of mounting points or offside fault.It is thus clear that existing single-ended transient protection method all can not right-only be distinguished " outside this lateral areas ", " DC power transmission line is distinguished interior completely ", " outside the lateral areas " fault, all can not realize all fronts protection on the complete meaning.
Summary of the invention
Not high in order to overcome existing extra high voltage direct current transmission line traveling-wave protection reliability; Utilize that protecting 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 realize that extra high voltage direct current transmission line protects completely; Utilize protecting component distinguish to outside the lateral areas, the single-ended transient voltage protection of the extra high voltage direct current transmission line of troubles inside the sample space do not propose how failure judgement is protection this side of mounting points or the shortcoming of offside fault; The present invention provides the guard method of a kind of extra high voltage direct current transmission line both-end transient voltage; This method reliability is high, and can realize that extra high voltage direct current transmission line protects completely.
The present invention solves this technical problem the technical scheme that is adopted: utilize rectification side smoothing reactor 7, rectification side DC filter 9, rectification side PLC wave filter 11 to constitute the extra high voltage direct current transmission line " border " of rectification side in the rectification side; Utilize inversion side smoothing reactor 8, inversion side DC filter 10, inversion side PLC wave filter 12 to constitute the extra high voltage direct current transmission line " border " of inversion side in the inversion side; The rectification side is provided with rectification side protection mounting points 3; The inversion side is provided with inversion side protection mounting points 13, and rectification side and inversion side are about point symmetry in the DC power transmission line; Concrete grammar can carry out according to following step:
The first step, utilize the protecting component failure judgement to be positioned near the rectification side still near the inversion side;
Concrete determination methods is: in rectification side protection mounting points 3; Utilize formula
to calculate when circuit breaks down transient state energy U1 in rectification side protection mounting points 3 detected fault transient voltage high fdrequency components; In inversion side protection mounting points 13; Utilize formula
to calculate when circuit breaks down transient state energy U2 in inversion side protection mounting points 13 detected fault transient voltage high fdrequency components; Deduct inversion side protection mounting points fault transient voltage high fdrequency component transient state energy U2 with rectification side protection mounting points fault transient voltage high fdrequency component transient state energy U1; If U1-U2=0, then fault is positioned at the extra high voltage direct current transmission line mid point; If U1-U2>0, i.e. U1>U2, for extra high voltage direct current transmission line breaks down near the rectification side; < 0, promptly < U2 is for extra high voltage direct current transmission line breaks down near the inversion side U1 as if U1-U2;
Second the step, utilize protecting component distinguish to outside the lateral areas, troubles inside the sample space;
Concrete determination methods is: judge fault and be positioned near the inversion rear flank; In rectification side protection mounting points 3; Utilize formula
to calculate when line end breaks down transient state energy in rectification side 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 rectification side protection mounting points 3; Utilize formula
transient state energy in rectification side protection mounting points 3 detected transient voltage high fdrequency components when calculating this point failure; The size of the transient state energy of the fault transient voltage high fdrequency component the when transient state energy through this fault transient voltage high fdrequency component relatively is with the line end fault is at last distinguished the troubles inside the sample space of extra high voltage direct current transmission line all fronts and the external area error of inversion side;
The 3rd step, utilize rectification side protecting component to distinguish the troubles inside the sample space of the outer and DC power transmission line in the district of inversion side, utilize the protecting component of inversion side to distinguish outside the district of rectification side and the troubles inside the sample space of DC power transmission line;
Concrete determination methods is: utilize rectification side protecting component to distinguish the troubles inside the sample space and the external area error of inversion side, utilize the protecting component of inversion side to distinguish the troubles inside the sample space and the external area error of rectification side; Be positioned near the inversion side when judging fault; Protecting mounting points 3 detected fault transient voltage high fdrequency component transient state energies in the rectification side during with the line end point failure is standard; Fault transient voltage high fdrequency component transient state energy when the rectification side is protected mounting points 3 detected fault transient voltage high fdrequency component transient state energies less than the line end point failure, then fault is a fault outside the inversion lateral areas; Fault transient voltage high fdrequency component transient state energy when the rectification side is protected mounting points 3 detected fault transient voltage high fdrequency component transient state energies more than or equal to the line end point failure, then fault is an inversion lateral areas internal fault.Be positioned near the rectification side when judging fault; Protecting mounting points 13 detected fault transient voltage high fdrequency component transient state energies in the inversion side during with the line end point failure is standard; Fault transient voltage high fdrequency component transient state energy when the inversion side is protected mounting points 13 detected fault transient voltage high fdrequency component transient state energies less than the line end point failure, then fault is a fault outside the rectification lateral areas; Fault transient voltage high fdrequency component transient state energy when the inversion side is protected mounting points 13 detected fault transient voltage high fdrequency component transient state energies more than or equal to the line end point failure, then fault is a rectification lateral areas internal fault.Judge fault and be positioned at the extra high voltage direct current transmission line mid point, then fault is the extra high voltage direct current transmission line troubles inside the sample space.
Described rectification top-cross streaming system 1, rectifier bridge 2, rectification side protection mounting points 3, DC line 4, inverter bridge 5, inversion top-cross streaming system 6, rectification side smoothing reactor 7, inversion side smoothing reactor 8, rectification side DC filter 9, inversion side DC filter 10, rectification side PLC wave filter 11, inversion side PLC wave filter 12,1 inversion side protection mounting points 13 all are common components.
The invention has the beneficial effects as follows: utilize rectification side and inversion side protective device, can judge fault and be positioned near the rectification side or near the inversion side; Be positioned near the inversion side when judging fault, utilize rectification side protective device, can distinguish the external area error and the DC power transmission line all fronts fault (troubles inside the sample space) of inversion side; Be positioned near the rectification side when judging fault, utilize inversion side protective device, can distinguish the external area error and the DC power transmission line all fronts fault (troubles inside the sample space) of rectification side, thereby the realization extra high voltage direct current transmission line is protected completely.
Description of drawings
Fig. 1 be utilize protecting 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.
Fig. 2 be utilize protecting component distinguish to outside the lateral areas, the extra high voltage direct current transmission line both-end transient voltage protection philosophy figure of troubles inside the sample space.
Among the figure: 1-rectification top-cross streaming system, 2-rectifier bridge, 3-rectification side 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 wave filter, 12-inversion side PLC wave filter, 13-inversion side protection mounting points.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is further specified.
As shown in Figure 1: the inventor has proposed utilize protecting 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, utilize rectification side smoothing reactor 7, rectification side DC filter 9, rectification side PLC wave filter 11 to constitute the extra high voltage direct current transmission line " border " of rectification sides in the rectification side; Utilize inversion side smoothing reactor 8, inversion side DC filter 10, inversion side PLC wave filter 12 to constitute the extra high voltage direct current transmission line " border " of inversion side in the inversion side; This protection philosophy utilizes that protecting component is distinguished outside the district of offside, troubles inside the sample space; But this protection philosophy does not propose how failure judgement is positioned near the rectification side or near the inversion side, and this protection is to utilize the single-ended transient voltage protection of the extra high voltage direct current transmission line of fault transient voltage.
Visible by Fig. 1; Protective device 3 for the rectification side; When the d3 point breaks down outside the inversion lateral areas; 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 distinguishing the fault transient voltage high frequency content that outer d3 point failure produces, promptly this principle can be distinguished " in the district " and " distinguishing outer " 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 trouble spot distance protection mounting points; Distance is near more; Attenuation is more little; The d1 point failure fault transient signal high frequency content that the d3 point failure produces outside line end d2 point, the district in the fault transient signal high frequency content ratio district that the protection mounting points produces is much bigger in the district; It is thus clear that this principle can be distinguished d1 point failure and d3 point failure " in the district " and " district is outer ", the distance of d1 point d2 point failure distance protection mounting points in can also distinguishing.It is thus clear that this method proposes utilize protecting component distinguish to the lateral areas outside, the single-ended transient voltage protection philosophy of extra high voltage direct current transmission line of troubles inside the sample space can realize all fronts outside the lateral areas and in the extra high voltage direct current transmission line district are protected.The single-ended transient voltage protection philosophy of this extra high voltage direct current transmission line is to utilize that rectification side protecting component is distinguished in the district of inversion side, external area error; Utilize that the protecting component of inversion side is distinguished in the district of rectification side, external area error, but this transient protection principle does not propose how failure judgement is positioned near the rectification side or near the inversion side.
Overcoming on the basis of deficiency of the prior art, the present invention proposes the guard method of a kind of extra high voltage direct current transmission line both-end transient voltage,
As shown in Figure 2: principle of work of the present invention: the rectification side of extra-high voltage DC transmission system and inversion side are about point symmetry in the extra high voltage direct current transmission line; When fault was positioned at the DC power transmission line mid point, the fault transient voltage high fdrequency component that arrives rectification side and inversion side protection mounting points equated; When fault was positioned near the rectification side, the fault transient voltage high fdrequency component that arrives rectification side protection mounting points was greater than the fault transient voltage high fdrequency component that arrives inversion side protection mounting points; When fault is positioned near the inversion side; The fault transient voltage high fdrequency component that arrives rectification side protection mounting points is less than the fault transient voltage high fdrequency component that arrives inversion side protection mounting points; So relatively the fault transient voltage high fdrequency component transient state energy size of rectification side protection mounting points and inversion side protection mounting points just can failure judgement be positioned near the rectification side or near the inversion side.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; The transient voltage high fdrequency component that is produced is big more, so utilize the protective device of rectification side, calculates 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.For the protective device that is installed in the inversion side; The dual decay that the transient voltage high fdrequency component that the external area error of rectification 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 inversion 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 inversion side protection installation place; The transient voltage high fdrequency component that is produced is big more, so utilize the protective device of inversion side, calculates 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 rectification side.So first failure judgement is positioned near the rectification side or near the inversion side, judges fault and be positioned near the inversion rear flank; Utilize the protective device of rectification side to distinguish outside the Nei He district, district of fault; Judge fault and be positioned at, utilize the protective device of inversion side to distinguish outside the Nei He district, district of fault, be positioned at the DC power transmission line mid point if judge fault near the rectification rear flank; Then directly think troubles inside the sample space, thereby the realization extra high voltage direct current transmission line is protected completely.
The present invention utilizes rectification side smoothing reactor 7, rectification side DC filter 9, rectification side PLC wave filter 11 to constitute the extra high voltage direct current transmission line " border " of rectification side in the rectification side; Utilize inversion side smoothing reactor 8, inversion side DC filter 10, inversion side PLC wave filter 12 to constitute the extra high voltage direct current transmission line " border " of inversion side in the inversion side; The rectification side is provided with rectification side protection mounting points 3; The inversion side is provided with inversion side protection mounting points 13, and rectification side and inversion side are about point symmetry in the DC power transmission line; Concrete grammar can carry out according to following step:
The first step, utilize the protecting component failure judgement to be positioned near the rectification side still near the inversion side;
Concrete determination methods is: in rectification side protection mounting points 3; Utilize formula
to calculate when circuit breaks down transient state energy U1 in rectification side protection mounting points 3 detected fault transient voltage high fdrequency components; In inversion side protection mounting points 13; Utilize formula
to calculate when circuit breaks down transient state energy U2 in inversion side protection mounting points 13 detected fault transient voltage high fdrequency components; Deduct inversion side protection mounting points fault transient voltage high fdrequency component transient state energy U2 with rectification side protection mounting points fault transient voltage high fdrequency component transient state energy U1; If U1-U2=0, then fault is positioned at the extra high voltage direct current transmission line mid point; If U1-U2>0, i.e. U1>U2, for extra high voltage direct current transmission line breaks down near the rectification side; < 0, promptly < U2 is for extra high voltage direct current transmission line breaks down near the inversion side U1 as if U1-U2;
Second the step, utilize protecting component distinguish to outside the lateral areas, troubles inside the sample space;
Concrete determination methods is: judge fault and be positioned near the inversion rear flank; In rectification side protection mounting points 3; Utilize formula
to calculate when line end breaks down transient state energy in rectification side 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 rectification side protection mounting points 3; Utilize formula
transient state energy in rectification side protection mounting points 3 detected transient voltage high fdrequency components when calculating this point failure; The size of the transient state energy of the fault transient voltage high fdrequency component the when transient state energy through this fault transient voltage high fdrequency component relatively is with the line end fault is at last distinguished the troubles inside the sample space of extra high voltage direct current transmission line all fronts and the external area error of inversion side;
The 3rd step, utilize rectification side protecting component to distinguish the troubles inside the sample space of the outer and DC power transmission line in the district of inversion side, utilize the protecting component of inversion side to distinguish outside the district of rectification side and the troubles inside the sample space of DC power transmission line;
Concrete determination methods is: utilize rectification side protecting component to distinguish the troubles inside the sample space and the external area error of inversion side, utilize the protecting component of inversion side to distinguish the troubles inside the sample space and the external area error of rectification side; Be positioned near the inversion side when judging fault; Protecting mounting points 3 detected fault transient voltage high fdrequency component transient state energies in the rectification side during with the line end point failure is standard; Fault transient voltage high fdrequency component transient state energy when the rectification side is protected mounting points 3 detected fault transient voltage high fdrequency component transient state energies less than the line end point failure, then fault is a fault outside the inversion lateral areas; Fault transient voltage high fdrequency component transient state energy when the rectification side is protected mounting points 3 detected fault transient voltage high fdrequency component transient state energies more than or equal to the line end point failure, then fault is an inversion lateral areas internal fault.Be positioned near the rectification side when judging fault; Protecting mounting points 13 detected fault transient voltage high fdrequency component transient state energies in the inversion side during with the line end point failure is standard; Fault transient voltage high fdrequency component transient state energy when the inversion side is protected mounting points 13 detected fault transient voltage high fdrequency component transient state energies less than the line end point failure, then fault is a fault outside the rectification lateral areas; Fault transient voltage high fdrequency component transient state energy when the inversion side is protected mounting points 13 detected fault transient voltage high fdrequency component transient state energies more than or equal to the line end point failure, then fault is a rectification lateral areas internal fault.Judge fault and be positioned at the extra high voltage direct current transmission line mid point, then fault is the extra high voltage direct current transmission line troubles inside the sample space.
This method can also be distinguished the distance of troubles inside the sample space distance protection mounting points; For rectification side protection mounting points 3; Protecting mounting points 3 detected fault transient voltage high fdrequency components in the rectification side during with line end
point failure is standard; Fault transient voltage high fdrequency component when the rectification side is protected mounting points 3 detected fault transient voltage high fdrequency components less than line end
point failure, then fault is a fault outside the inversion lateral areas; 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 trouble spot is near more apart from rectification side protection mounting points 3, otherwise just far away more.For inversion side protection mounting points 13; Protecting mounting points 13 detected fault transient voltage high fdrequency components in the inversion side during with line end
point failure is standard; Fault transient voltage high fdrequency component when protecting mounting points 13 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 13 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; Protection mounting points 13 detected fault transient voltage high frequency contents are big more; The trouble spot is near more apart from inversion side protection mounting points 13, otherwise just far away more.
The present invention proposes utilize protecting component distinguish to outside the lateral areas, the extra high voltage direct current transmission line both-end transient voltage protection philosophy of troubles inside the sample space can realize that extra high voltage direct current transmission line protects completely.
The present invention describes through the practical implementation process; Without departing from the present invention; Can also carry out various conversion and be equal to replacement patent of the present invention; Therefore, patent of the present invention is not limited to disclosed practical implementation process, and should comprise the whole embodiments that fall in the Patent right requirement scope of the present invention.
Claims (1)
1. extra high voltage direct current transmission line both-end transient voltage guard method; It is characterized in that: utilize smoothing reactor, DC filter, the PLC wave 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 wave filter of inversion side to constitute the extra high voltage direct current transmission line " border " of inversion side in the inversion side; Rectification side and inversion side are considered the attenuation of extra high voltage direct current transmission line to fault transient signal high frequency content simultaneously about point symmetry in the DC power transmission line;
The first step, utilize the protecting component failure judgement to be positioned near the rectification side still near the inversion side;
Determination methods is: when extra high voltage direct current transmission line breaks down, at first utilize
and calculate rectification side protection mounting points fault transient voltage high frequency content U1 and inversion side protection mounting points fault transient voltage high frequency content U2; Then, deduct inversion side protection mounting points fault transient voltage high frequency content U2 with rectification side protection mounting points fault transient voltage high frequency content U1;
If U1-U2=0, then fault is positioned at the extra high voltage direct current transmission line mid point;
If U1-U2>0, i.e. U1>U2, for extra high voltage direct current transmission line breaks down near the rectification side;
< 0, promptly < U2 is for extra high voltage direct current transmission line breaks down near the inversion side U1 as if U1-U2;
Second the step, utilize protecting component distinguish to outside the lateral areas, troubles inside the sample space;
Concrete grammar is: in the protection mounting points; At first utilize formula
to calculate when line end breaks down transient state energy in the detected fault transient voltage of protection mounting points high fdrequency component, and as the standard of judging; When fault appears in certain point in the circuit; In the protection mounting points; Utilize formula
transient state energy in protection mounting points detected transient voltage high fdrequency component when calculating this point failure; The size of the transient state energy of the fault transient voltage high fdrequency component the when transient state energy through fault transient voltage high fdrequency component relatively is with the line end fault is at last distinguished extra high voltage direct current transmission line troubles inside the sample space completely and the external area error of protecting the mounting points offside;
The 3rd step, utilize rectification side protecting component to distinguish the troubles inside the sample space of the outer and DC power transmission line in the district of inversion side, utilize the protecting component of inversion side to distinguish outside the district of rectification side and the troubles inside the sample space of DC power transmission line;
Concrete comparative approach: utilize rectification side protecting component to distinguish the troubles inside the sample space and the external area error of inversion side, utilize the protecting component of inversion side to distinguish the troubles inside the sample space and the external area error of rectification side; Judging fault is positioned near the inversion rear flank; Utilize rectification side protective device; Be standard in protection mounting points detected fault transient voltage high fdrequency component during with the line end point failure; Fault transient voltage high fdrequency component when protecting the detected fault transient voltage of mounting points high fdrequency component less than the line end point failure, then fault is a fault outside the inversion lateral areas; 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 an inversion lateral areas internal fault;
Judging fault is positioned near the rectification rear flank; Utilize inversion side protective device; Be standard in protection mounting points detected fault transient voltage high fdrequency component during with the line end point failure; Fault transient voltage high fdrequency component when protecting the detected fault transient voltage of mounting points high fdrequency component less than the line end point failure, then fault is a fault outside the rectification lateral areas; 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 a rectification lateral areas internal fault; Judge fault and be positioned at the extra high voltage direct current transmission line mid point, then fault is the extra high voltage direct current transmission line troubles inside the sample space.
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| CN103149411A (en) * | 2013-01-31 | 2013-06-12 | 福建省电力有限公司 | Electric transmission line grounding fault point voltage transient value extracting method |
| CN103543358A (en) * | 2013-10-24 | 2014-01-29 | 昆明理工大学 | Method for defining attenuation effect of extra-high voltage transmission line and boundary on high frequency quantity |
| CN103592569A (en) * | 2013-11-06 | 2014-02-19 | 昆明理工大学 | Extra-high voltage direct-current transmission line fault location method based on high frequency value attenuation characteristics |
| CN104377667A (en) * | 2014-11-06 | 2015-02-25 | 上海交通大学 | High-voltage direct-current line pilot protection method based on boundary energy |
| CN107449988A (en) * | 2017-09-08 | 2017-12-08 | 广东电网有限责任公司电力科学研究院 | The fault type determination methods and device of a kind of flexible direct current power transmission system |
| CN108711833A (en) * | 2018-05-23 | 2018-10-26 | 三峡大学 | A kind of extra high voltage direct current transmission line guard method based on U-I characteristics |
| CN109073714A (en) * | 2016-04-05 | 2018-12-21 | 通用电器技术有限公司 | The improvement or improvement relevant to power converter failure detection of power converter failure detection |
| CN109188188A (en) * | 2018-07-10 | 2019-01-11 | 国网浙江省电力有限公司杭州供电公司 | The single-ended method of discrimination of Multi-end flexible direct current transmission line fault based on voltage monitoring |
| CN110568320A (en) * | 2018-11-06 | 2019-12-13 | 云南电网有限责任公司电力科学研究院 | Power transmission line lightning fault positioning method based on accurate voltage measurement |
| CN114200246A (en) * | 2021-11-29 | 2022-03-18 | 昆明理工大学 | Fault location method and system for direct-current transmission line |
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| CN103543358A (en) * | 2013-10-24 | 2014-01-29 | 昆明理工大学 | Method for defining attenuation effect of extra-high voltage transmission line and boundary on high frequency quantity |
| CN103543358B (en) * | 2013-10-24 | 2016-08-17 | 昆明理工大学 | 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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| CN107449988A (en) * | 2017-09-08 | 2017-12-08 | 广东电网有限责任公司电力科学研究院 | The fault type determination methods and device of a kind of flexible direct current power transmission system |
| CN108711833A (en) * | 2018-05-23 | 2018-10-26 | 三峡大学 | A kind of extra high voltage direct current transmission line guard method based on U-I characteristics |
| CN108711833B (en) * | 2018-05-23 | 2019-06-25 | 三峡大学 | A kind of extra high voltage direct current transmission line guard method based on U-I characteristic |
| CN109188188A (en) * | 2018-07-10 | 2019-01-11 | 国网浙江省电力有限公司杭州供电公司 | The single-ended method of discrimination of Multi-end flexible direct current transmission line fault based on voltage monitoring |
| CN110568320A (en) * | 2018-11-06 | 2019-12-13 | 云南电网有限责任公司电力科学研究院 | Power transmission line lightning fault positioning method based on accurate voltage measurement |
| CN110568320B (en) * | 2018-11-06 | 2021-10-15 | 云南电网有限责任公司电力科学研究院 | Power transmission line lightning fault positioning method based on accurate voltage measurement |
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