CN102315615A - Vehicular DC (Direct Current) ice melting device and protection method thereof - Google Patents
Vehicular DC (Direct Current) ice melting device and protection method thereof Download PDFInfo
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- CN102315615A CN102315615A CN201110129859A CN201110129859A CN102315615A CN 102315615 A CN102315615 A CN 102315615A CN 201110129859 A CN201110129859 A CN 201110129859A CN 201110129859 A CN201110129859 A CN 201110129859A CN 102315615 A CN102315615 A CN 102315615A
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Abstract
The invention discloses a vehicular DC (Direct Current) ice melting device and a protection method thereof. The vehicular DC ice melting device comprises valve side current transformers Iva, Ivb and Ivc, an air-cooled current converter R, DC side voltage transformers Udp and Udn and the DC side current transformers Idp and Idn, all of which are connected with a control protection system C, and power grid voltage transformers Uab, Ubc and Uac of a transformer substation are temporarily connected with the control protection system C during ice melting. The vehicular DC ice melting device disclosed by the invention has the advantages of reasonable design, low investment and low cost; and the protection method of the vehicular DC ice melting device, disclosed by the invention, ensures that the DC ice melting device meets requirements of each line on safe and fast ice melting and reduces the investment of the DC ice melting device. The vehicular DC ice melting device disclosed by the invention has the advantages of smart design, excellent performance, low investment, complete protection functions, convenience, practicability and suitability for low-voltage lines in the power grid.
Description
Technical field
The present invention is a kind of vehicular DC de-icing device and guard method thereof; Particularly a kind of vehicular DC de-icing device and guard method thereof that is applicable to electrical network mesolow (110kV and following) line ice-melting belongs to the innovative technology that the power transmission network power line DC ice-melting is used.
Background technology
Electrical network is important foundation facility and the public utilities that concern national energy security and lifelines of the national economy, and bearing is the weighty responsibility that socio-economic development and national economy provide important energy guarantee, the promotion sustainable development of socio-economy.Along with improving constantly of modernization level, the whole society is increasingly high 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 power breakdown of wide.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.
For tackling the serious threat of more and more frequent ice damage to electric power system infrastructure, multiple deicing/de-icing technology has been studied by industrial quarters and academia.Wherein, the basic principle of DC ice melting is to convert interchange into direct current through high-power rectifying device to carry out ice-melt so that ice coating wire is heated.The DC ice melting technology has overcome the restriction that exchanges ice-melt, and the perceptual weight of line impedance is inoperative during DC ice melting, greatly reduces the required capacity of DC ice melting, has improved ice-melt efficient; Direct voltage is adjustable continuously during DC ice melting, through the adjustment VD, can satisfy the ice-melt requirement of different length circuit, and need not carry out impedance matching, greatly reduces the harsh demand of ice-melt to power system operation mode; The DC de-icing device that is installed on the load-center substation can be carried out ice-melt work to all turnover lines in full station.
In the world, the former Soviet Union brought into use the ice-melt of diode rectification device from 1972, adopted silicon controlled rectifier afterwards.Russia direct current research institute has successfully developed the silicon controlled rectifier deicing device of 2 electric pressures: 14kV (by the power supply of 11 kV ac bus) and 50kV (by the power supply of 38.5 kV ac bus).The rated power of 14kV device is 14MW, and the rated power of 50kV device is 50MW.50MW is installed on and put into operation in transformer station in 1994, and is successfully applied to the deicing of the 110kV transmission line of one 315 km length.Behind the North America ice damages in 1998; Quebec hydroelectric board and AREVA T&D company drop into 2,500 ten thousand; Developed DC de-icing device cooperatively, and a cover DC de-icing device, capacity 250 MW have installed in the L é vis transformer station of electrical network in the Quebec; VD ± 17.4 kV, purpose of design are that 4 735kV and 2 315kV circuits are carried out ice-melt.This device was accomplished field test in 2008, but did not carry out actual ice-melt so far.
Behind the ice damages in 2008; China electric power scientific worker has independently carried out the research and development of DC ice melting technology and device, has successfully developed the high power DC deicing device with complete independent intellectual property right, mainly comprises the band special rectifier transformer, is not with multiple patterns such as special rectifier transformer and vehicle-mounted removable; And then apply in the whole nation; Up to the present, the cover DC de-icing device puts into operation surplus in the of total about 20, wherein is furnished with 19 covers in the south electric network.
In January, 2009; The Guizhou grid company is executed II line, 220 kilovolts of old lines of good fortune, 110 kilovolts of water trees of 110 kilovolts of good fortune ox lines plum line to 500 kilovolts of good fortune and has been carried out DC ice melting; Yunnan Power Grid Company has carried out DC ice melting to 220 kilovolts of clear big I lines, and Guangdong Power Grid company carries out DC ice melting to the logical plum line line of 110kV.In November, 2009, Yunnan Power Grid Company has carried out DC ice melting to 110 kilovolts big-and-middle T lines.The practical application at initial stage shows that the DC ice melting technology is the effective means of electrical network deicing.
In January, 2011; The large tracts of land icing attacks south electric network once more; The 19 cover DC de-icing devices of having installed in the south electric network have all been brought into play significant role, the above circuit of 110kV is carried out DC ice melting amount to 217 times, and wherein the 500kV alternating current circuit is 33 times; Give full play to the power of DC de-icing device, guaranteed the safety of electrical network.
The band special rectifier transformer of having applied and be not installed on transformer station with the DC de-icing device of special rectifier transformer, its volume and weight has determined it during ice damage, can not realize moving flexibly.Invest greatly and can not move flexibly in view of it, therefore be inappropriate for and apply at electrical network mesolow (110kV and following) circuit.
Summary of the invention
The objective of the invention is to consider the problems referred to above and provide a kind of reasonable in design, small investment, the vehicular DC de-icing device that is applicable to electrical network mesolow (110kV and following) line ice-melting that cost is low.The present invention does not need the configure dedicated rectifier transformer, adopts air cooling system, and the about 800-1500kg of its weight can be placed on the automobile and can adopt automobile to move easily, and electrical network mesolow circuit (110kV and following) ice-melt length is surpassed 50km.
Another object of the present invention is to provide a kind of and guarantee that DC de-icing device satisfies the demand of the quick ice-melt of mesolow line security, and the guard method of the vehicular DC de-icing device of the investment of reduction DC de-icing device.
Technical scheme of the present invention is: vehicular DC de-icing device of the present invention; Include current on valve side instrument transformer Iva, Ivb and Ivc; Adopt the converter R of air cooling; Dc voltage instrument transformer Udp and Udn; DC side current transformer Idp and Idn; Wherein the end of current on valve side instrument transformer Iva, Ivb and Ivc all is connected with the electrical network of transformer station through isolation switch K and AC side power supply circuit breaker Q F; The other end of current on valve side instrument transformer Iva, Ivb and Ivc is connected with converter R respectively, and converter R is anodal to be connected with dc voltage instrument transformer Udp and DC side current transformer Idp to reach with the A phase conductor of DC ice-melting or B phase conductor or C phase conductor and to be connected, and converter R negative pole is connected with dc voltage instrument transformer Udn and DC side current transformer Idn to reach with the A phase conductor of DC ice-melting or B phase conductor or C phase conductor and is connected; Current on valve side instrument transformer Iva, Ivb and Ivc and converter R and dc voltage instrument transformer Udp and Udn, DC side current transformer Idp and Idn all are connected with control protection system C, and line voltage instrument transformer Uab, Ubc and the Uac of transformer station and control protection system C are connected when ice-melt temporarily.
The end of above-mentioned wherein current on valve side instrument transformer Iva, Ivb and Ivc all is connected through isolation switch K.
Above-mentioned AC side power supply circuit breaker Q F, isolation switch K are arranged in the transformer station.
Above-mentioned DC side is not established earth point.
Above-mentioned converter DC side output current is decided to be 800-1200A, rated voltage 12-13kV, and converter adopts air cooling, has wide-angle rated current serviceability.
The end of above-mentioned current on valve side instrument transformer Iva, Ivb and Ivc adopts preparation joint to connect through being connected of AC power in the inlet wire transformer station temporarily; Above-mentioned converter R both positive and negative polarity adopts preparation joint to be connected when carrying out ice-melt with each phase conductor of DC ice-melting temporarily; Above-mentioned control protection system C need with the voltage signal of 110kV voltage transformer Uab, Ubc and Uac of transformer station adopt preparation joint and control protection system C and when carrying out ice-melt, be connected temporarily.
Above-mentioned current on valve side instrument transformer Iva, Ivb and Ivc; Adopt the converter R of air cooling; Dc voltage instrument transformer Udp and Udn; DC side current transformer Idp and Idn, control protection system C and other auxiliary equipment all are placed in the cabinet, and total weight is about 800-1500kg, and are placed on the automobile and move.
Above-mentioned converter can also connect the bank of filters that the reactive power compensation harmonic suppresses.
The guard method of vehicular DC de-icing device of the present invention, the measurement point of DC de-icing device include and exchange valve side three-phase voltage (Uva, Uvb, Uvc), three-phase current (Iva, Ivb, Ivc), DC side electric current (Idp, Idn), dc voltage DC side electric current (Udp, Udn) totally 10 measurement points.
The protection zone of DC de-icing device of the present invention is divided into interchange protection zone, three parts in converter unit protection district and DC line protection district.
The protection of DC de-icing device of the present invention is configured to AC overvoltage protection, interchange under-voltage protection, interchange overcurrent protection, valve short circuit protection, bridge differential protection, direct current overcurrent protection, the supervision of thyristor junction temperature, false triggering protection, DC over-voltage protection, direct current under-voltage protection, direct current 50Hz protection, direct current 100Hz protection, open circuit test protection and the differential protection of DC ice-melting direct voltage.
Vehicular DC de-icing device of the present invention is reasonable in design, small investment, and cost is low; The guard method of vehicular DC de-icing device of the present invention guarantees that DC de-icing device satisfies the demand of the quick ice-melt of each line security, and reduces the cost of investment of DC de-icing device.The present invention is that a kind of design is ingenious, and function admirable is invested lowly, and defencive function is complete, convenient and practical vehicular DC de-icing device and guard method thereof.
Description of drawings
Vehicular DC de-icing device main electrical scheme and measurement point configuration schematic diagram thereof that Fig. 1 proposes for the present invention.
Embodiment
Embodiment:
It is as shown in table 1 that the vehicular DC de-icing device that the present invention proposes can carry out the typical mesolow line length of ice-melt, and the length that provides in the table 1 has been taken all factors into consideration the restriction of DC de-icing device capacity and DC side maximum transmission voltage.
The power supply of the vehicular DC de-icing device that the present invention proposes is directly got 110kV transforming plant main transformer 10kV side.Typical case 110kV or 35kV main transformer low-pressure side short circuit current also are the commutating reactance that typical 110kV main transformer all can provide converter commutation needs less than triode thyristor conducting state commonly used (non-repetition) electric current of surging.
The main electrical scheme of this vehicular DC de-icing device is as shown in Figure 1, adopt 6 pulsation rectifications, and DC side is not established earth point.Converter DC side output current is decided to be 800-1000A, and rated voltage 12-13kV adopts air-cooled.The interior equipment of chain-dotted line is the vehicular DC de-icing device among Fig. 1; Comprise converter body, current on valve side instrument transformer, DC side current transformer, voltage transformer, control protection equipment and other auxiliary equipment; Be placed in the customization cabinet; The about 800-1500kg of total weight can be placed on the automobile and between each transformer station, move.The idle harmonic that produces during the DC de-icing device operation can transform the filter of taking into account vehicle-mounted DC de-icing device operation as through former Electric capacity compensation device in will standing.Consider the short-time characteristic of ice-melt, under certain condition,, then also can not dispose bank of filters and carry out the inhibition of reactive power compensation harmonic if can a 110kV main transformer 10kV side be soared with the input power supply as converter.Filter can determine whether dispose as the case may be.
The main effect of smoothing reactor is to prevent discontinuous current, restriction current pulsation and short circuit current in the commutating circuit.As previously mentioned, the 110kV main transformer can limiting short-circuit current.110kV and following line reactance are bigger more than 4 times than D.C. resistance; Time constant T=L/R>4/314=12.7ms; The pulsation period Ts=20/6=3.3ms of 6 pulsation full-wave bridge rectifiers; The time constant in ice-melt loop is greater than the current pulsation cycle, and electric current can be not interrupted, so special smoothing reactor need be set.In like manner, commutating reactance and limiting short-circuit current that typical 110kV main transformer can provide converter to need be not so need to be provided with specially commutating reactance.
The present invention proposes the vehicular DC de-icing device and adopts preparation joint with interim connection of DC ice-melting and the interior AC power in station.
It is as shown in Figure 1 that the present invention proposes vehicular DC de-icing device measurement point layout, comprises exchanging valve side three-phase voltage (Uva, Uvb, Uvc), three-phase current (Iva, Ivb, Ivc), DC side electric current (Idp, Idn), dc voltage DC side electric current 10 measurement points such as (Udp, Udn).The protection zone is divided into interchange protection zone, three parts in converter unit protection district and DC line protection district, and the defencive function configuration is as shown in table 2, totally 14 kinds of protections.
The vehicular DC de-icing device important technological parameters that the present invention proposes is as shown in table 3.
The characteristics of this vehicle-mounted DC de-icing device main electrical scheme are:
1) do not need special rectifier transformer, directly be connected on 110kV main transformer 10kV side.
2) commutating reactance need be set.
3) do not need to be provided with specially smoothing reactor.
4) do not need configuring direct current filter or direct current trap.
5) DC side is not provided with earth point.
6) converter DC side output current is decided to be 800-1200A, and rated voltage 12-13kV adopts air-cooledly, does not adopt water cooling system.
7) can be used for most 110kV and following electric pressure line ice-melting, require converter to have the big electric current serviceability of long-term wide-angle.
8) converter body, current on valve side instrument transformer, DC side current transformer, voltage transformer, control protection equipment and other auxiliary equipment are placed in the customization casing the about 800-1500kg of total weight.Can lay on the automobile and between each transformer station, move.
The idle harmonic that produces when 9) DC de-icing device moves can transform the filter of taking into account vehicle-mounted DC de-icing device operation as through former Electric capacity compensation device in will standing.
Claims (10)
1. vehicular DC de-icing device; It is characterized in that including current on valve side instrument transformer Iva, Ivb and Ivc; Adopt the converter R of air cooling; Dc voltage instrument transformer Udp and Udn; DC side current transformer Idp and Idn; Wherein the end of current on valve side instrument transformer Iva, Ivb and Ivc all is connected with the electrical network of transformer station through isolation switch K and AC side power supply circuit breaker Q F; The other end of current on valve side instrument transformer Iva, Ivb and Ivc is connected with converter R respectively, and converter R is anodal to be connected with dc voltage instrument transformer Udp and DC side current transformer Idp to reach with the A phase conductor of DC ice-melting or B phase conductor or C phase conductor and to be connected, and converter R negative pole is connected with dc voltage instrument transformer Udn and DC side current transformer Idn to reach with the A phase conductor of DC ice-melting or B phase conductor or C phase conductor and is connected; Current on valve side instrument transformer Iva, Ivb and Ivc and converter R and dc voltage instrument transformer Udp and Udn, DC side current transformer Idp and Idn all are connected with control protection system C, and line voltage instrument transformer Uab, Ubc and the Uac of transformer station and control protection system C are connected when ice-melt temporarily.
2. vehicular DC de-icing device according to claim 1 is characterized in that the end of above-mentioned wherein current on valve side instrument transformer Iva, Ivb and Ivc all is connected through isolation switch K.
3. vehicular DC de-icing device according to claim 2 not needing between converter valve and the power supply is characterized in that the inlet wire reactor.
4. vehicular DC de-icing device according to claim 2 is characterized in that above-mentioned AC side power supply circuit breaker Q F and isolation switch K are arranged in the transformer station.
5. vehicular DC de-icing device according to claim 1 is characterized in that above-mentioned DC side do not establish earth point.
6. vehicular DC de-icing device according to claim 1 is characterized in that above-mentioned converter DC side output current is decided to be 800-1200A, rated voltage 12-13kV, and converter adopts air cooling, has wide-angle rated current serviceability.
7. vehicular DC de-icing device according to claim 1 is characterized in that the end of above-mentioned current on valve side instrument transformer Iva, Ivb and Ivc adopts preparation joint to connect through being connected of AC power in the transformer station temporarily; Above-mentioned converter R both positive and negative polarity adopts preparation joint to be connected when carrying out ice-melt with each phase conductor of DC ice-melting temporarily; Above-mentioned control protection system C need with the voltage signal of 110kV voltage transformer Uab, Ubc and Uac of transformer station adopt preparation joint and control protection system C and when carrying out ice-melt, be connected temporarily.
8. vehicular DC de-icing device according to claim 1; It is characterized in that above-mentioned current on valve side instrument transformer Iva, Ivb and Ivc; Adopt the converter R of air cooling, dc voltage instrument transformer Udp and Udn, DC side current transformer Idp and Idn, control protection system C and other auxiliary equipment all are placed in the cabinet; Total weight is about 800-1500kg, and is placed on the automobile and moves.
9. vehicular DC de-icing device according to claim 1 is characterized in that above-mentioned converter can also connect the bank of filters that the reactive power compensation harmonic suppresses.
10. guard method according to vehicular DC de-icing device according to claim 1 is characterized in that the measurement point of DC de-icing device includes interchange valve side three-phase voltage (Uva, Uvb, Uvc), three-phase current (Iva, Ivb, Ivc), DC side electric current (Idp, Idn), dc voltage DC side electric current (Udp, Udn) totally 10 measurement points; The protection zone of DC de-icing device is divided into interchange protection zone, three parts in converter unit protection district and DC line protection district; The protection of DC de-icing device is configured to AC overvoltage protection, interchange under-voltage protection, interchange overcurrent protection, valve short circuit protection, bridge differential protection, direct current overcurrent protection, the supervision of thyristor junction temperature, false triggering protection, DC over-voltage protection, direct current under-voltage protection, direct current 50Hz protection, direct current 100Hz protection, open circuit test protection and the differential protection of DC ice-melting direct voltage.
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| CN201110129859A CN102315615A (en) | 2011-05-19 | 2011-05-19 | Vehicular DC (Direct Current) ice melting device and protection method thereof |
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| CN201110129859A CN102315615A (en) | 2011-05-19 | 2011-05-19 | Vehicular DC (Direct Current) ice melting device and protection method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105048388A (en) * | 2015-08-20 | 2015-11-11 | 国家电网公司 | Vehicle-mounted DC ice-melting device for all-insulation composite-fiber overhead ground wire |
| CN106159861A (en) * | 2016-07-25 | 2016-11-23 | 国网湖南省电力公司 | A kind of major network movable DC ice melting device |
| CN112165024A (en) * | 2020-09-03 | 2021-01-01 | 常州博瑞电力自动化设备有限公司 | Water-cooling box type movable ice melting device |
| CN113013830A (en) * | 2021-03-03 | 2021-06-22 | 贵州电网有限责任公司 | Method for calculating online ice melting distance protection setting impedance of sub-conductor group of transmission line |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105048388A (en) * | 2015-08-20 | 2015-11-11 | 国家电网公司 | Vehicle-mounted DC ice-melting device for all-insulation composite-fiber overhead ground wire |
| CN106159861A (en) * | 2016-07-25 | 2016-11-23 | 国网湖南省电力公司 | A kind of major network movable DC ice melting device |
| CN112165024A (en) * | 2020-09-03 | 2021-01-01 | 常州博瑞电力自动化设备有限公司 | Water-cooling box type movable ice melting device |
| CN113013830A (en) * | 2021-03-03 | 2021-06-22 | 贵州电网有限责任公司 | Method for calculating online ice melting distance protection setting impedance of sub-conductor group of transmission line |
| CN113013830B (en) * | 2021-03-03 | 2023-06-30 | 贵州电网有限责任公司 | Power transmission line sub-conductor grouping online ice melting distance protection setting impedance calculation method |
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Application publication date: 20120111 |