CN101459326A - Determination method for principal parameters of DC ice melting device - Google Patents
Determination method for principal parameters of DC ice melting device Download PDFInfo
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- CN101459326A CN101459326A CNA2008102207148A CN200810220714A CN101459326A CN 101459326 A CN101459326 A CN 101459326A CN A2008102207148 A CNA2008102207148 A CN A2008102207148A CN 200810220714 A CN200810220714 A CN 200810220714A CN 101459326 A CN101459326 A CN 101459326A
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Abstract
The invention relates to a determining method for principle parameters of a DC-based deicer, which comprises the following steps: 1) collecting principle parameters of each circuit in application scope of a DC-based deicer, 2) operating and determining the minimum deicing current according to historical weather conditions, taking the maximum value in the minimum deicing current of each circuit as a rated current of the DC-based de-icer, 3) utilizing the minimum deicing current and a deicing way to calculate direct current voltage and capacity of the DC-based deicer, 4) utilizing 1.2 times of the minimum deicing current and a deicing type to calculate output voltage and capacity of the DC-based deicer, 5) taking the maximum value of the direct current voltage and the maximum value of the capacity calculated in the step 3) and the step 4) as the rated direct current voltage and rated capacity of the DC-based deicer, and 6) defining the overload capacity of current and capacity of the DC-based deicer as 1.2 times of rated two hours. The invention can optimize each parameter of the DC-based deicer, can reduce capacity of the DC-based deicer as much as possible on the premise of guaranteeing each circuit of the DC-based deicer to deice fast to further reduce investment in the DC-based deicer. The invention can be applied to the designs of DC-based deicers in each transformer substation in an electrical power system, and has good application prospect.
Description
Technical field
The present invention is a kind of determination method for principal parameters of DC ice melting device, belongs to the renovation technique of determination method for principal parameters of DC ice melting device.
Background technology
Power industry at present is the basic industry of national economy, and it is the means of production of promoting national economic development, and is again the indispensable means of livelihood during people live.Electrical network is important foundation facility and the public utilities that concern national energy security and lifelines of the national economy, and bearing to socio-economic development and national economy provides the important energy guarantee, promotes the weighty responsibility of the sustainable development of socio-economy.Along with improving constantly of modernization level, the whole society is more and more higher to the degree of dependence of electric power, and the quality of supply of electric power has also been proposed requirements at the higher level.
The powerline ice-covering that low temperature sleet freezing weather causes is one of serious threat of being faced of system of numerous State Grid, and serious icing can cause the electrical network broken string, fall tower, causes large area blackout, also makes fast quick-recovery send the electricity very difficulty that becomes.Since the forties in 20th century, the threat of ice damage is the big technical barrier that the electric power system industrial quarters does one's utmost to tackle always.North America storm in 1998 has powered up guipure to U.S.A and has seriously influenced, and has caused the wide power breakdown of scope.2005, low temperature sleet freezing weather caused serious disaster once for China Central China, North China electrical network.The 1-2 month in 2008, low temperature sleet freezing weather attacks China south, Central China, East China once more, cause Guizhou, Hunan, Guangdong, Yunnan, Guangxi and Jiangxi etc. to economize transmission line large tracts of land, the long-time stoppage in transit, bring about great losses for national economy and people's lives.
In order to prevent the appearance once more of this situation, it is a kind of good method that transmission line is carried out ice-melt.With to exchange ice-melting method different, under certain environmental condition, the needed power supply capacity of DC ice melting need only to be decided by the D.C. resistance and the conductor length of DC ice-melting.Different with the high voltage direct current transmission operation, owing to will be applicable to many line ice-meltings, DC de-icing device has a plurality of nominal operating conditions.But up to the present, there is not systematic principal parameters of DC ice melting device to determine method as yet.
Summary of the invention
The objective of the invention is to consider the problems referred to above and provide a kind of guaranteeing that DC de-icing device satisfies each circuit fast under the prerequisite of ice-melt, reduce the capacity of DC de-icing device as far as possible, with the determination method for principal parameters of DC ice melting device of the investment that reduces DC de-icing device.
Technical scheme of the present invention is: include following steps:
1) major parameter of each circuit in the collection DC de-icing device range of application;
2) according to the minimum ice melting current of historical meteorological condition calculating and definite each circuit, the maximum of getting in the minimum ice melting current of each circuit is the DC de-icing device rated current;
3) with the direct voltage and the capacity of minimum ice melting current and ice-melting mode calculating DC de-icing device, wherein the computing formula of direct voltage is: U
DC=2 * r * I * L, the computing formula of capacity is: P
DC=2 * r * I
2* L;
In the formula: the dc resistivity of r-lead (Ω/km); The minimum ice melting current (A) of I-lead;
Conductor length (km) between L-two transformer station.
4) with the output voltage and the capacity of 1.2 times of minimum ice melting currents and ice-melting mode calculating DC de-icing device, wherein the computing formula of direct voltage is:
U
DC=1.5 * r * I * L, the computing formula of capacity is: P
DC=1.5 * r * I
2* L;
In the formula: the dc resistivity of r-lead (Ω/km); The minimum ice melting current (A) of I-lead;
Conductor length (km) between L-two transformer station.
5) get direct voltage maximum that step 3) and step 4) calculate and maximum capacity rated direct voltage and rated capacity as DC de-icing device;
6) determine DC de-icing device electric current and capacity overload ability be 1.2 times specified two hours, 1.2 times specified two hours promptly device can with 1.2 times of rated capacity and rated current 1.2 by operation two hours.
Above-mentioned steps 1) major parameter of each circuit comprises wire type, line length, D.C. resistance in the collection DC de-icing device range of application.
Above-mentioned steps 5) result of calculation is determined the rated capacity and the specified VD of DC de-icing device.
Above-mentioned steps 1) major parameter of each circuit comprises wire type, line length, D.C. resistance in the collection DC de-icing device range of application.
According to above-mentioned steps 5) result of calculation determine other parameter of DC de-icing device.
The present invention can be so that each parameter of DC de-icing device be optimized, and is guaranteeing that DC de-icing device satisfies each circuit fast under the prerequisite of ice-melt, reduces the capacity of DC de-icing device, as far as possible to reduce the investment of DC de-icing device.The present invention is a kind of convenient and practical determination method for principal parameters of DC ice melting device.The present invention can the power application system in the design of each transforming plant DC deicing device, have a good application prospect.
Description of drawings
Fig. 1 is the schematic diagram of ice-melting mode 1 of the present invention;
Fig. 2 is the schematic diagram of ice-melting mode 2 of the present invention.
Embodiment
Below in conjunction with drawings and Examples the present invention is further described.
Technical scheme of the present invention is:
Determination method for principal parameters of DC ice melting device of the present invention includes following steps:
1) major parameter of each circuit in the collection DC de-icing device range of application;
2) according to the minimum ice melting current of historical meteorological condition calculating and definite each circuit, the maximum of getting in the minimum ice melting current of each circuit is the DC de-icing device rated current;
3) with the direct voltage and the capacity of minimum ice melting current and ice-melting mode 1 calculating DC de-icing device, wherein the computing formula of direct voltage is: U
DC=2 * r * I * L, the computing formula of capacity is: P
DC=2 * r * I
2* L;
In the formula: the dc resistivity of r-lead (Ω/km); The minimum ice melting current (A) of I-lead;
Conductor length (km) between L-two transformer station.
4) with the output voltage and the capacity of 1.2 times of minimum ice melting currents and ice-melting mode 2 calculating DC de-icing devices, wherein the computing formula of direct voltage is: U
DC=1.5 * r * I * L, the computing formula of capacity is: P
DC=1.5 * r * I
2* L;
In the formula: the dc resistivity of r-lead (Ω/km); The minimum ice melting current (A) of I-lead;
Conductor length (km) between L-two transformer station.
5) get direct voltage maximum that step 3) and step 4) calculate and maximum capacity rated direct voltage and rated capacity as DC de-icing device;
6) determine DC de-icing device electric current and capacity overload ability be 1.2 times specified two hours, 1.2 times specified two hours promptly device can with 1.2 times of rated capacity and rated current 1.2 by operation two hours.
Above-mentioned steps 1) major parameter of each circuit comprises wire type, line length, D.C. resistance in the collection DC de-icing device range of application.
Above-mentioned steps 5) result of calculation is determined the rated capacity and the specified VD of DC de-icing device.
Above-mentioned steps 1) major parameter of each circuit comprises wire type, line length, D.C. resistance in the collection DC de-icing device range of application.
According to above-mentioned steps 5) result of calculation determine other parameter of DC de-icing device.
The schematic diagram of above-mentioned ice-melting mode 1 as shown in Figure 1, its operation principle is: will need the alternating current circuit of ice-melt to have a power failure, to the station with A, B, C two phase conductor short circuits, A, C two phase conductors are inserted two outputs of DC de-icing device at our station, utilize DC de-icing device that A, B lead are injected direct current, carry out A, the ice-melt of B phase conductor.
The schematic diagram of above-mentioned ice-melting mode 2 as shown in Figure 2, its operation principle is: will need the alternating current circuit of ice-melt to have a power failure, to the station with A, B, C two phase conductor short circuits, at our station with A, B two phase conductors and connect the output that DC de-icing device is inserted in the back, the C phase conductor is inserted another output of DC de-icing device at our station, utilize DC de-icing device that A, B, C three-phase conducting wire are injected direct current, carry out the ice-melt of C phase conductor.
For Guizhou electrical network 500kV Fuquan transformer station, in 1-2 month ice damage in 2008, all 500kV outlets have brought devastating impact all owing to icing seriously damages to south electric network.In this transformer station one cover DC de-icing device has been installed this year DC ice melting is carried out in all 500kV outlets, this cover DC de-icing device major parameter adopts the present invention to determine.Design process is as follows:
1) 500kV Fuquan transformer station has 6 500kV outlets, and line conductor model, line length, D.C. resistance are like shown in table 1, table 2 the 2nd～3 row;
2) determine that according to historical meteorological condition the minimum ice melting current of these 6 circuits is approximately 3475A;
3) with minimum ice melting current and as shown in Figure 1 ice-melting mode 1 calculate direct voltage that each circuit DC ice melting needs and capacity shown in table 1 the 6th～7 row;
4) with 1.2 times of minimum ice melting currents and as shown in Figure 2 ice-melting mode 2 calculate direct voltage that each circuit DC ice melting needs and capacity shown in table 2 the 6th～7 row;
5) 3) and 4) the direct voltage maximum that calculates is that 16.9kV, maximum capacity are 58.8MW, therefore selecting the rated capacity of this DC de-icing device is 60MW, the direct current maximum voltage is 17kV, and rated current is 3530A, electric current and capacity overload ability be designed to 1.2 times specified two hours;
6) result with step 5) determines other parameter of DC de-icing device.
The table 1:500kV Fuquan 500kV of transformer station outlet 1-1 ice-melt mode major parameter calculates
| Line name | Line style | Length (km) | D.C. resistance (Ω/km) | Minimum ice melting current (A) | Direct current pressure drop (V) | Ice-melt power supply capacity (MW) |
| The blue or green line of 500kV good fortune | LGJ-4× 400/50 | 105.7 | 0.01809 | 3475 | 13284.4 | 46.2 |
| The expensive good fortune line of 500kV | LGJ-4× 400/50 | 91.0 | 0.01809 | 3475 | 11441.0 | 39.8 |
| 500kV duck good fortune I returns | LGJ-4× 400/50 | 130.3 | 0.01809 | 3475 | 16383.2 | 56.9 |
| 500kV duck good fortune II returns | LGJ-4× 400/50 | 134.7 | 0.01809 | 3475 | 16932.5 | 58.8 |
| The 500kV good fortune is executed I and is returned | LGJ-4× 400/50 | 90.4 | 0.01809 | 3475 | 11360.2 | 39.5 |
| The 500kV good fortune is executed II and is returned | LGJ-4× 400/50 | 90.4 | 0.01809 | 3475 | 11360.2 | 39.5 |
The table 2:500kV Fuquan 500kV of transformer station outlet 2-1 ice-melt mode major parameter calculates
| Line name | Line style | Length (km) | D.C. resistance (Ω/km) | 1.2 doubly minimum ice melting current (A) | Direct current pressure drop (V) | Ice-melt power supply capacity (MW) |
| The blue or green line of 500kV good fortune | LGJ-4× 400/50 | 105.7 | 0.01809 | 4170 | 9963.3 | 34.6 |
| The expensive good fortune line of 500kV | LGJ-4× 400/50 | 91.0 | 0.01809 | 4170 | 8580.8 | 29.8 |
| 500kV duck good fortune I returns | LGJ-4× 400/50 | 130.3 | 0.01809 | 4170 | 12287.4 | 42.7 |
| 500kV duck good fortune II returns | LGJ-4× 400/50 | 134.7 | 0.01809 | 4170 | 12699.3 | 44.1 |
| The 500kV good fortune is executed I and is returned | LGJ-4× 400/50 | 90.4 | 0.01809 | 4170 | 8520.1 | 29.6 |
| The 500kV good fortune is executed II and is returned | LGJ-4× 400/50 | 90.4 | 0.01809 | 4170 | 8520.1 | 29.6 |
Claims (3)
1, a kind of determination method for principal parameters of DC ice melting device is characterized in that including following steps:
1) major parameter of each circuit in the collection DC de-icing device range of application;
2) according to the minimum ice melting current of historical meteorological condition calculating and definite each circuit, the maximum of getting in the minimum ice melting current of each circuit is the DC de-icing device rated current;
3) with the direct voltage and the capacity of minimum ice melting current and ice-melting mode calculating DC de-icing device, wherein the computing formula of direct voltage is: U
DC=2 * r * I * L, the computing formula of capacity is: P
DC=2 * r * I
2* L;
In the formula: the dc resistivity of r-lead (Ω/km); The minimum ice melting current (A) of I-lead;
Conductor length (km) between L-two transformer station.
4) with the output voltage and the capacity of 1.2 times of minimum ice melting currents and ice-melting mode calculating DC de-icing device, wherein the computing formula of direct voltage is: U
DC=1.5 * r * I * L, the computing formula of capacity is: P
DC=1.5 * r * I
2* L;
In the formula: the dc resistivity of r-lead (Ω/km); The minimum ice melting current (A) of I-lead;
Conductor length (km) between L-two transformer station.
5) get direct voltage maximum that step 3) and step 4) calculate and maximum capacity rated direct voltage and rated capacity as DC de-icing device;
6) determine DC de-icing device electric current and capacity overload ability be 1.2 times specified two hours, 1.2 times specified two hours promptly device can with 1.2 times of rated capacity and rated current 1.2 by operation two hours.
2, determination method for principal parameters of DC ice melting device according to claim 1 is characterized in that above-mentioned steps 1) major parameter of collecting each circuit in the DC de-icing device range of application comprises wire type, line length, D.C. resistance.
3, determination method for principal parameters of DC ice melting device according to claim 1 is characterized in that according to above-mentioned steps 5) result of calculation determine the rated capacity and the specified VD of DC de-icing device.
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| CNA2008102207148A CN101459326A (en) | 2008-12-31 | 2008-12-31 | Determination method for principal parameters of DC ice melting device |
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|---|---|---|---|
| CNA2008102207148A CN101459326A (en) | 2008-12-31 | 2008-12-31 | Determination method for principal parameters of DC ice melting device |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102570369A (en) * | 2012-01-20 | 2012-07-11 | 南方电网科学研究院有限责任公司 | Method for designing direct current thawing device with special-purpose converter transformer |
| CN102611061A (en) * | 2012-03-13 | 2012-07-25 | 云南电力试验研究院（集团）有限公司电力研究院 | Single-pole ground loop type direct-current deicing method for overhead ground wire and OPGW (optical fiber composite overhead ground wire) |
| CN104577927A (en) * | 2015-01-21 | 2015-04-29 | 武汉大学 | Self-adaption composite heating power ice melting cooperating method |
| CN104779571A (en) * | 2015-04-22 | 2015-07-15 | 国家电网公司 | Power transmission line ice melting method based on gravity action calculation model |
| CN112636244A (en) * | 2020-12-11 | 2021-04-09 | 国网湖南省电力有限公司 | Design method of dancing-eliminating and ice-melting transformer with wide voltage regulation and fine current regulation |
| CN114977059A (en) * | 2022-04-19 | 2022-08-30 | 杭州佳辰电力科技有限公司 | Direct-current ice melting method, device and system based on distributed energy storage power station |
-
2008
- 2008-12-31 CN CNA2008102207148A patent/CN101459326A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102570369A (en) * | 2012-01-20 | 2012-07-11 | 南方电网科学研究院有限责任公司 | Method for designing direct current thawing device with special-purpose converter transformer |
| CN102570369B (en) * | 2012-01-20 | 2015-04-15 | 南方电网科学研究院有限责任公司 | Method for designing direct current thawing device with special-purpose converter transformer |
| CN102611061A (en) * | 2012-03-13 | 2012-07-25 | 云南电力试验研究院（集团）有限公司电力研究院 | Single-pole ground loop type direct-current deicing method for overhead ground wire and OPGW (optical fiber composite overhead ground wire) |
| CN102611061B (en) * | 2012-03-13 | 2015-06-24 | 云南电力试验研究院（集团）有限公司电力研究院 | Single-pole ground loop type direct-current deicing method for overhead ground wire and OPGW (optical fiber composite overhead ground wire) |
| CN104577927A (en) * | 2015-01-21 | 2015-04-29 | 武汉大学 | Self-adaption composite heating power ice melting cooperating method |
| CN104577927B (en) * | 2015-01-21 | 2017-01-25 | 武汉大学 | Self-adaption composite heating power ice melting cooperating method |
| CN104779571A (en) * | 2015-04-22 | 2015-07-15 | 国家电网公司 | Power transmission line ice melting method based on gravity action calculation model |
| CN104779571B (en) * | 2015-04-22 | 2016-03-09 | 国家电网公司 | Based on the transmission line de-icing method of Action of Gravity Field computation model |
| CN112636244A (en) * | 2020-12-11 | 2021-04-09 | 国网湖南省电力有限公司 | Design method of dancing-eliminating and ice-melting transformer with wide voltage regulation and fine current regulation |
| CN114977059A (en) * | 2022-04-19 | 2022-08-30 | 杭州佳辰电力科技有限公司 | Direct-current ice melting method, device and system based on distributed energy storage power station |
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Open date: 20090617 |