CN103326299B - Starting method of overhead ground wire and composite optical fiber ground wire direct-current ice melting system - Google Patents
Starting method of overhead ground wire and composite optical fiber ground wire direct-current ice melting system Download PDFInfo
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- CN103326299B CN103326299B CN201310200739.2A CN201310200739A CN103326299B CN 103326299 B CN103326299 B CN 103326299B CN 201310200739 A CN201310200739 A CN 201310200739A CN 103326299 B CN103326299 B CN 103326299B
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- 239000002131 composite material Substances 0.000 title claims abstract description 44
- 238000002844 melting Methods 0.000 title claims abstract description 35
- 230000008018 melting Effects 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 26
- 239000013307 optical fiber Substances 0.000 title abstract description 4
- 239000000835 fiber Substances 0.000 claims description 40
- 239000012212 insulator Substances 0.000 claims description 4
- UQXNEWQGGVUVQA-UHFFFAOYSA-N 8-aminooctanoic acid Chemical compound NCCCCCCCC(O)=O UQXNEWQGGVUVQA-UHFFFAOYSA-N 0.000 claims description 3
- 239000004020 conductor Substances 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 206010033799 Paralysis Diseases 0.000 description 1
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Abstract
The invention discloses a starting method of a direct-current deicing system for an overhead ground wire and a composite optical fiber ground wire. The DC ice melting device used by the starting method comprises a current converter, a DC knife switch and a control protection system, wherein two ends of an overhead ground wire or a composite optical fiber ground wire needing ice melting are directly and respectively connected with the anode and the cathode of the current converter in the DC ice melting device through the DC knife switch, or are respectively connected with the anode and the cathode of the current converter in the DC ice melting device through any phase of conducting wire through the DC knife switch, and the starting method of the DC ice melting system comprises the following steps: 1) superposing a current value on the minimum allowable current as an unlocking reference current within a period of time when an unlocking command is sent out; 2) after the period of time, linearly reducing the unlocking reference current to the minimum allowable current; 3) in the unlocking process, a proportional integral regulator is adopted to enable the current in the direct-current ice melting loop to track the unlocking reference current; the invention can ensure that the direct current ice melting device quickly establishes stable direct current.
Description
Technical field
The present invention is the starting method of a kind of overhead ground wire and composite fiber ground wire direct current ice melting system, belongs to the innovative technology of the starting method of overhead ground wire and composite fiber ground wire direct current ice melting system.
Background technology
In the various natural calamities that electric power system suffers, ice damage is one of the most serious threat.Compared with other accident, the loss that ice damage causes to electrical network is often even more serious, and ice gently then occurs and dodges, heavy then can cause the broken string of falling tower, even electrical network is paralysed.
In recent years, global all kinds of meteorological disaster is more frequent, the more aobvious exception of Extreme Weather-climate Events, and ice damage causes the loss of electric power system and affects more serious, and destructiveness is more and more stronger, and impact also becomes increasingly complex, and reply difficulty is also increasing.As October nineteen twenty-one Sweden's ice damage, in January, 1972 Colombia of U.S. state ice damage, in January, 1998 Northeastern United States and Canadian southeast ice damage, in December, 1999 France ice damage, south Swedish in January, 2005 ice damage, Germany in November, 2005 ice damage.
By the impact of macroclimate, mima type microrelief, microclimate condition, China's ice damage accident frequently occurs, and the impact that electrical network is subject to is more and more serious.At the beginning of 2005, Central China's low temperature sleet and snow ice weather rarely seen in the history causes serious disaster to China Central China, North China Power Telecommunication Network.The 1-2 month in 2008, low temperature sleet and snow ice weather attacks south China, Central China, East China, cause Guizhou, Hunan, Guangdong, Yunnan, Guangxi and Jiangxi etc. to economize transmission line large area, stop transport for a long time, bring about great losses to national economy and people's lives.In January, 2011, there is icing dangerous situation in the power transformating and supplying facility of Guizhou Province, Hunan Province, Jiangxi Province, area, northern Guangxi, Northern Guangdong Province, Guangdong and Northeastern Yunnan, Yunnan, successively causes many circuits and transformer station in succession.At the beginning of 2012, at the beginning of 2013, China's electrical network is subject to the impact of icing all in various degree.
Each icing at the beginning of 2009 at the beginning of-2013 is interim, and south electric network application DC de-icing device implements DC ice melting more than 400 times to 110kV and above overhead transmission line, ensure that the safety of circuit and electrical network.
Overhead ground wire and composite fiber ground wire (OPGW) are links more fragile in transmission line, and relative to wire, overhead ground wire and composite fiber ground wire (OPGW) damage easier to be impaired because of icing, cause line tripping and stop transport.South electric network finds when within 2011, implementing extensive ice-melt to wire, and after solution aerial condutor icing, ground wire icing and composite fiber ground wire (OPGW) recover power transmission chief factors of success after having become line tripping and having affected wire ice-melt.
Be different from aerial condutor, the common overhead ground wire of China mainly adopts graded insulation, one point grounding mode, composite fiber ground wire (OPGW) adopts by base earthing mode substantially, directly cannot carry out ice-melt to overhead ground wire and composite fiber ground wire (OPGW).Because Ground wire with insulation ocver significantly can reduce transmission line loss, domestic and international electric power scientific worker is unanimously at the research and practice carrying out this respect, and it is feasible that existing research and practical application show that overhead ground wire and composite fiber ground wire (OPGW) insulation run.Therefore, realize overhead ground wire and composite fiber ground wire (OPGW) DC ice melting, to the overall anti-icing ability of raising transmission line, ensure that mains supply reliability has very important meaning, economic benefit and social benefit highly significant.
South electric network completed research and the demonstration project construction of ground wire and the application of composite fiber ground wire (OPGW) DC ice melting in 2011, Yunnan Power Grid Company, superhigh pressure company and Guizhou Power Grid company have all carried out a large amount of work, obtain good effect.At the beginning of 2012, Yunnan Power System carries out ground wire deicing 12 times altogether, and composite ground wire (OPGW) ice-melt 3 times maked somebody a mere figurehead by optical fiber, reaches expection effect.In anti-icing anti-ice work just in 2012 end of the year-2013, south electric network carries out the DC ice melting of 16 times altogether to ground wire and composite fiber ground wire (OPGW), all reach ideal effect.
Carry out the situation repeatedly occurring in DC ice melting practice that ice melting system startup is unsuccessful, electric current cannot be set up at ground wire and composite fiber ground wire (OPGW), have a strong impact on the performance of DC ice melting function.
Summary of the invention
The object of the invention is to consider the problems referred to above and provide a kind of and can ensure that the DC de-icing device carrying out ice-melt to overhead ground wire and composite fiber ground wire can be set up rapidly galvanic current stream and reach the overhead ground wire of the object of quick ice-melt and the starting method of composite fiber ground wire direct current ice melting system.De-icing method of the present invention is easy to operate, and efficiency is high.
Technical scheme of the present invention is: the starting method of overhead ground wire of the present invention and composite fiber ground wire direct current ice melting system, described starting method DC de-icing device used includes converter, direct current disconnecting link, Control protection system, the two ends of the overhead ground wire of ice-melt or composite fiber ground wire are needed directly to be connected respectively with the positive pole of converter in DC de-icing device and negative pole through direct current disconnecting link, or be connected respectively through the positive pole of direct current disconnecting link and converter in DC de-icing device and negative pole by any phase conductor, Control protection system is connected with converter, the starting method of direct current ice melting system is as follows:
1) Control protection system is within the T1 time sending unlock command, unlocks reference current Iref and minimum acceptable current i
minrelation be shown below:
Iref＝i
min(1+k)(1)；
2) Control protection system in the time, unlocks reference current Iref and minimum acceptable current i to (T1+T2) after the T1 sending unlock command
minrelation be shown below:
Iref＝i
min+i
min×[1-(t-T1)/T2]×k(2)；
Wherein t is variable, namely sends the time after the moment relative to unlock command;
3) Control protection system is sending (T1+T2) of unlock command after the time, unlocks reference current Iref and minimum acceptable current i
minrelation be shown below:
Iref＝i
min(3)；
4) Control protection system is sending in releasing process, and adoption rate integral controller makes current tracking reference current Iref in DC ice melting loop;
For six pulsating direct current deicing devices, above-mentioned minimum acceptable current i
mincalculate according to the following formula:
For 12 pulsating direct current deicing devices, above-mentioned minimum acceptable current i
minaccording to the following formula
Calculate:
U
di0-DC de-icing device ideal no-load direct voltage, ω-AC system first-harmonic angular frequency, L-DC ice melting loop total inductance; K
r-safety factor, span is 1.3-2.0.
Above-mentioned overhead ground wire is connected with shaft tower by being with the ground insulator of portable protective gaps in parallel with composite fiber ground wire, and gap value is 40-100mm.
Above-mentioned DC de-icing device can realize the ice-melt of single hop independence or multistage ice-melt simultaneously in parallel to overhead ground wire and composite fiber ground wire, and during ice-melt, overhead ground wire and composite fiber ground wire access DC de-icing device using both positive and negative polarity wire as bus.
The span of above-mentioned k is 0.1-0.3.
The span of above-mentioned T1 is 100-400ms.
The span of above-mentioned T2 is 200-500ms.
The present invention unlocks electric current to set up stable DC electric current fast in DC ice melting loop owing to temporarily strengthening in DC de-icing device start-up course, avoid the insulator generation flashover on overhead ground wire and composite fiber ground wire in releasing process, the present invention can ensure that DC de-icing device overhead ground wire and composite fiber ground wire being carried out to ice-melt sets up rapidly galvanic current stream, reaches the object of quick ice-melt.De-icing method of the present invention is easy to operate, and efficiency is high.The present invention is that a kind of design is ingenious, function admirable, the starting method of convenient and practical overhead ground wire and composite fiber ground wire direct current ice melting system.
Accompanying drawing explanation
Fig. 1 is that DC de-icing device schematic diagram is directly accessed at overhead ground wire of the present invention and composite fiber ground wire two ends.
Fig. 2 is overhead ground wire of the present invention and composite fiber ground wire segmentation access DC de-icing device schematic diagram.
Fig. 3 is overhead ground wire of the present invention and composite fiber ground wire enable logic figure.
Fig. 4 is reference current change schematic diagram in overhead ground wire of the present invention and composite fiber ground wire start-up course.
Embodiment
Embodiment:
The structural representation of DC de-icing device is directly accessed as shown in Figure 1 in overhead ground wire of the present invention and composite fiber ground wire (OPGW) two ends, the DC de-icing device that the starting method of overhead ground wire of the present invention and composite fiber ground wire direct current ice melting system is used includes converter 1, direct current disconnecting link 2, Control protection system 3, the two ends of the overhead ground wire of ice-melt or composite fiber ground wire are needed directly to be connected respectively with the positive pole of converter in DC de-icing device 1 and negative pole through direct current disconnecting link 2, or be connected respectively through the positive pole of direct current disconnecting link 2 and converter in DC de-icing device 1 and negative pole by any phase conductor, Control protection system 3 is connected with converter 1,
The starting method of direct current ice melting system is as follows:
1) Control protection system 3 is within the T1 time sending unlock command, unlocks reference current Iref and minimum acceptable current i
minrelation be shown below:
Iref＝i
min(1+k)(1)；
2) Control protection system 3 in the time, unlocks reference current Iref and minimum acceptable current i to (T1+T2) after the T1 sending unlock command
minrelation be shown below:
Iref＝i
min+i
min×[1-(t-T1)/T2]×k(2)；
Wherein t is variable, namely sends the time after the moment relative to unlock command.
3) Control protection system 3 is sending (T1+T2) of unlock command after the time, unlocks reference current Iref and minimum acceptable current i
minrelation be shown below:
Iref＝i
min(3)；
4) Control protection system is sending in releasing process, and adoption rate integral controller makes current tracking reference current Iref in DC ice melting loop;
For six pulsating direct current deicing devices, above-mentioned minimum acceptable current i
mincalculate according to the following formula:
For 12 pulsating direct current deicing devices, above-mentioned minimum acceptable current i
mincalculate according to the following formula:
U
di0-DC de-icing device ideal no-load direct voltage, ω-AC system first-harmonic angular frequency, L-DC ice melting loop total inductance; K
r-safety factor, span is 1.3-2.0.
Above-mentioned overhead ground wire is connected with shaft tower by being with the ground insulator of portable protective gaps in parallel with composite fiber ground wire, and gap value is 40-100mm.
Above-mentioned DC de-icing device can realize the ice-melt of single hop independence or multistage ice-melt simultaneously in parallel to overhead ground wire and composite fiber ground wire, and during ice-melt, overhead ground wire and composite fiber ground wire access DC de-icing device using both positive and negative polarity wire as bus.
In the present embodiment, the span of above-mentioned k is 0.1-0.3.
In the present embodiment, the span of above-mentioned T1 is 100-400ms.
In the present embodiment, the span of above-mentioned T2 is 200-500ms.
Claims (3)
1. the starting method of an overhead ground wire and composite fiber ground wire direct current ice melting system, described starting method DC de-icing device used includes converter, direct current disconnecting link, Control protection system, the two ends of the overhead ground wire of ice-melt or composite fiber ground wire are needed directly to be connected respectively through the positive pole of direct current disconnecting link and converter in DC de-icing device and negative pole, or be connected respectively through the positive pole of direct current disconnecting link and converter in DC de-icing device and negative pole by any phase conductor, Control protection system is connected with converter, it is characterized in that the starting method of direct current ice melting system is as follows:
1) Control protection system is within the T1 time sending unlock command, unlocks reference current Iref and minimum acceptable current i
minrelation be shown below:
Iref＝i
min(1+k)(1)；
2) Control protection system in the time, unlocks reference current Iref and minimum acceptable current i to (T1+T2) after the T1 sending unlock command
minrelation be shown below:
Iref＝i
min+i
min×[1-(t-T1)/T2]×k(2)；
Wherein t is variable, namely sends the time after the moment relative to unlock command;
3) Control protection system is sending (T1+T2) of unlock command after the time, unlocks reference current Iref and minimum acceptable current i
minrelation be shown below:
Iref＝i
min(3)；
4) Control protection system is sending in releasing process, and adoption rate integral controller makes current tracking in DC ice melting loop unlock reference current Iref;
For six pulsating direct current deicing devices, above-mentioned minimum acceptable current i
mincalculate according to the following formula:
For 12 pulsating direct current deicing devices, implement above-mentioned minimum acceptable current i
mincalculate according to the following formula:
U
di0-DC de-icing device ideal no-load direct voltage, ω-AC system first-harmonic angular frequency, L-DC ice melting loop total inductance; K
r-safety factor, span is 1.3-2.0;
The span of above-mentioned k is 0.1-0.3; The span of above-mentioned T1 is 100-400ms; The span of above-mentioned T2 is 200-500ms.
2. the starting method of overhead ground wire according to claim 1 and composite fiber ground wire direct current ice melting system; it is characterized in that above-mentioned overhead ground wire is connected with shaft tower by being with the ground insulator of portable protective gaps in parallel with composite fiber ground wire, gap value is 40-100mm.
3. the starting method of overhead ground wire according to claim 1 and composite fiber ground wire direct current ice melting system, it is characterized in that above-mentioned DC de-icing device can realize the ice-melt of single hop independence or multistage ice-melt simultaneously in parallel to overhead ground wire and composite fiber ground wire, during ice-melt, overhead ground wire and composite fiber ground wire access DC de-icing device using both positive and negative polarity wire as bus.
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| CN201310200739.2A CN103326299B (en) | 2013-05-27 | 2013-05-27 | Starting method of overhead ground wire and composite optical fiber ground wire direct-current ice melting system |
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| CN103326299B true CN103326299B (en) | 2016-01-20 |
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| CN111082385A (en) * | 2019-12-13 | 2020-04-28 | 国网北京市电力公司 | Line ice melting method, current control method and device |
| CN111463736A (en) * | 2020-05-08 | 2020-07-28 | 国网湖北省电力有限公司 | Direct ground wire grounding ice melting method |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4082962A (en) * | 1977-07-11 | 1978-04-04 | Burgsdorf Vladimir Vladimirovi | Device for melting the icing by direct current on conductors of overhead power transmission line |
| CA2281740A1 (en) * | 1998-09-11 | 2000-03-11 | Maurice Gagnon | Apparatus for removing ice from the cables of electric power transmission lines |
| RU2316867C1 (en) * | 2006-08-11 | 2008-02-10 | Открытое Акционерное Общество "Федеральная Сетевая Компания Единой Энергетической Системы" (Оао "Фск Еэс") | Combinatorial ice melting and reactive power correcting installation |
| CN201234105Y (en) * | 2008-07-30 | 2009-05-06 | 湖南省电力公司试验研究院 | Ice melting device for electricity transmission line |
| CN101546896A (en) * | 2008-03-29 | 2009-09-30 | 国网南京自动化研究院 | Ice melting method and device used by same |
| CN101820153A (en) * | 2010-03-30 | 2010-09-01 | 南方电网技术研究中心 | System debugging method for DC ice melting device |
| CN101877470A (en) * | 2010-03-30 | 2010-11-03 | 南方电网技术研究中心 | Direct current thawing apparatus with special rectiformer and protection method thereof |
-
2013
- 2013-05-27 CN CN201310200739.2A patent/CN103326299B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4082962A (en) * | 1977-07-11 | 1978-04-04 | Burgsdorf Vladimir Vladimirovi | Device for melting the icing by direct current on conductors of overhead power transmission line |
| CA2281740A1 (en) * | 1998-09-11 | 2000-03-11 | Maurice Gagnon | Apparatus for removing ice from the cables of electric power transmission lines |
| RU2316867C1 (en) * | 2006-08-11 | 2008-02-10 | Открытое Акционерное Общество "Федеральная Сетевая Компания Единой Энергетической Системы" (Оао "Фск Еэс") | Combinatorial ice melting and reactive power correcting installation |
| CN101546896A (en) * | 2008-03-29 | 2009-09-30 | 国网南京自动化研究院 | Ice melting method and device used by same |
| CN201234105Y (en) * | 2008-07-30 | 2009-05-06 | 湖南省电力公司试验研究院 | Ice melting device for electricity transmission line |
| CN101820153A (en) * | 2010-03-30 | 2010-09-01 | 南方电网技术研究中心 | System debugging method for DC ice melting device |
| CN101877470A (en) * | 2010-03-30 | 2010-11-03 | 南方电网技术研究中心 | Direct current thawing apparatus with special rectiformer and protection method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 500 kV 线路可移动直流融冰装置的研制和实现;冯炜等;《电力电子技术》;20091031;第43卷(第10期);全文 * |
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