CN107134740B - The anti-icing method and system of extra high voltage direct current transmission line on-load - Google Patents

The anti-icing method and system of extra high voltage direct current transmission line on-load Download PDF

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Publication number
CN107134740B
CN107134740B CN201710517287.9A CN201710517287A CN107134740B CN 107134740 B CN107134740 B CN 107134740B CN 201710517287 A CN201710517287 A CN 201710517287A CN 107134740 B CN107134740 B CN 107134740B
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China
Prior art keywords
icing
unit
conducting wire
current
electric current
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CN201710517287.9A
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CN107134740A (en
Inventor
陈缨
范松海
蒋兴良
龚奕宇
刘益岑
甘德刚
朱军
伊仁图太
张永
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Xi'an Simul Electric Co Ltd
Chongqing University
Sichuan Electric Power Research Institute
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Xi'an Simul Electric Co Ltd
Chongqing University
Sichuan Electric Power Research Institute
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02GINSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G1/00Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
    • H02G1/02Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for overhead lines or cables
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02GINSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G7/00Overhead installations of electric lines or cables
    • H02G7/16Devices for removing snow or ice from lines or cables

Abstract

The invention discloses a kind of anti-icing method and system of extra high voltage direct current transmission line on-load, method includes the following steps, obtains transmission line wire parameter and transmission line of electricity local environment parameter;The Anti-icing Critical Current I of UHVDC Transmission Lines is determined according to above-mentioned parameterfWith conducting wire tolerance electric current In;It maintains UHVDC Transmission Lines transmission power constant, increases transmission electric current, line current is made to be more than or equal to Anti-icing Critical Current If, while less than conducting wire tolerance electric current In, need not be to icing line outage in ice-melt.

Description

The anti-icing method and system of extra high voltage direct current transmission line on-load
Technical field
It prevents and reduces natural disasters technical field the present invention relates to electric system, and in particular to a kind of UHVDC Transmission Lines are not stopping The method and system of transmission line icing are prevented in the case of load.
Background technology
Icing is one of seriously threatening for power network safety operation.Serious icing has threatened the safety of extra high voltage line Stable operation causes to seriously affect to bulk power grid stable operation.By taking ± 800kV brocades Su Zhiliu as an example, since 2012 put into operation, 1 ground electrode circuit falls tower, 1 ground wire broken string, 1 tower body deformation, 2 lockings caused by icing, and other extra-high voltage direct-currents are defeated There is also similar situations for electric line and extra high voltage network.Tower occurs down because of serious icing, breaks for transmission line of electricity in order to prevent Line, stoppage in transit accident, often need according to transmission line icing real-time condition be unfolded ice-melt work.Current transmission line de-icing technology needs DC ice melting or exchange ice-melting mode are taken according to the affiliated voltage class of the circuit to icing line outage.But for spy Ultra-high-tension power transmission line, since the power supply capacity that line ice-melting needs is big, there is presently no sufficiently large ice-melt power supplys.
Invention content
The present invention in order to solve the above-mentioned technical problem provide a kind of anti-icing method of extra high voltage direct current transmission line on-load and System need not be to icing line outage in ice-melt.
The present invention is achieved through the following technical solutions:
The anti-icing method of extra high voltage direct current transmission line on-load, includes the following steps,
Obtain transmission line wire parameter and transmission line of electricity local environment parameter;
The Anti-icing Critical Current I of UHVDC Transmission Lines is determined according to above-mentioned parameterfWith conducting wire tolerance electric current In
It maintains UHVDC Transmission Lines transmission power constant, increases transmission electric current, line current is made to be more than or equal to anti-icing face Boundary electric current If, while controlling transmission electric current is less than conducting wire tolerance electric current In.It is right for the maximum temperature that line allows to be resistant to electric current In The electric current answered.
This programme realizes that the principle of ice-melt is to control line current in Anti-icing Critical Current IfAbove, conducting wire is resistant to electric current InHereinafter, realizing anti-icing purpose by adjusting size of current, whole process does not both need power operation, during anti-icing, Larger ice-melt power supply is not needed.
The conducting wire parameter includes wire type, conducting wire geometric parameter, conducting wire D.C. resistance;The environmental parameter includes wind Speed, environment temperature.
The Anti-icing Critical Current IfFor:
In formula, RcFor the radius of conducting wire, unit m;vaFor wind speed, unit m/s;TaFor environment temperature, unit is DEG C; rTFor T DEG C of temperature when unit length conducting wire D.C. resistance, unit is Ω/m;H is heat exchange coefficient, calculate need use with Lower 3 relative numbers:
Nu=CRenPr1/3 (4)
In formula (2)~(4):Re, Pr and Nu are respectively Reynolds number, Prandtl number and nusselt number;DcIt is single for diameter of wire Position is m;diFor ice covering thickness, unit m;vaFor wind speed, unit m/s;ν is the kinematic viscosity of air, ν=1.328 × 10- 5m2/s;A is the thermal diffusivity of air, a=1.88 × 10-5m2/s;C and n is coefficient, for icing weather, C=0.683, n =0.466.
In deicing processes, ice sheet outer surface is radiated by way of convection current heat transfer and radiant heat transfer to ambient enviroment, is dissipated Hot coefficient is:
In formula:H is coefficient of heat transfer, and unit is W/ (m2.℃);λaFor the heat transfer coefficient of air, λa=0.0244W/ (m. ℃);ε is the emissivity of ice sheet outer surface, ε=0.95;σ is Stefan-Boltzmann constants, σ=5.67 × 10-8W/m2. ℃4.It can be obtained after formula (5) abbreviation:
H=1.043 (0.295Rc)-0.534va 0.466+0.0439Ta+4.39 (6)
The tolerance electric current I of the conducting wirefFor:
In formula:TMAXFor the allowable temperature of conducting wire, unit is DEG C, according to the regulation of China's power industry, for commonly leading Line, TMAX=70 DEG C;H is the coefficient of heat transfer of conductive line surfaces, and unit is W/ (m2.℃);AcFor effective energization area of conducting wire, unit For m2;RxFor the radius of steel-cored aluminium strand steel core, unit m.
Conductor ice prevention electric current I should be controlled:
If<I<In (8)
To keep line load constant, line voltage distribution is reduced while increasing transmission electric current.
Extra high voltage direct current transmission line on-load anti-icing system, including,
Circuit microclimate monitoring device:Acquire wind speed, the environment temperature parameter of extra high voltage direct current transmission line local environment;
Anti-icing decision support apparatus:Extra-high straightening is determined according to wind speed, environment temperature parameter and transmission line wire parameter The Anti-icing Critical Current I of Flow LinefWith conducting wire tolerance electric current In
The anti-icing current control device of power delivery circuit:It keeps UHVDC Transmission Lines transmission power constant, controls power delivery circuit Electric current is more than or equal to Anti-icing Critical Current IfAnd less than tolerance electric current In
Compared with prior art, the present invention having the following advantages and advantages:
The present invention according to transmission line wire parameter and local environment parameter by obtaining Anti-icing Critical Current and conducting wire is resistance to By electric current, in the case where maintaining UHVDC Transmission Lines transmission power constant, increase transmission electric current achievees the purpose that anti-icing, has Effect accomplished not have a power failure during anti-icing, the purpose of on-load, improve the stability and reliability of supply of electric power.
Description of the drawings
Attached drawing described herein is used for providing further understanding the embodiment of the present invention, constitutes one of the application Point, do not constitute the restriction to the embodiment of the present invention.In the accompanying drawings:
Fig. 1 is schematic structural view of the invention.
1, circuit microclimate monitoring device;2, anti-icing decision support apparatus;3 and power delivery circuit control device;4, the change of current It stands.
Specific implementation mode
To make the objectives, technical solutions, and advantages of the present invention clearer, with reference to embodiment and attached drawing, to this Invention is described in further detail, and exemplary embodiment of the invention and its explanation are only used for explaining the present invention, do not make For limitation of the invention.
Embodiment 1
The anti-icing method of extra high voltage direct current transmission line on-load, includes the following steps,
Obtain transmission line wire parameter and transmission line of electricity local environment parameter;
The Anti-icing Critical Current I of UHVDC Transmission Lines is determined according to above-mentioned parameterfWith conducting wire tolerance electric current In
It maintains UHVDC Transmission Lines transmission power constant, increases transmission electric current, line current is made to be more than or equal to anti-icing face Boundary electric current IfAnd less than tolerance electric current In.It is provided according to China's transmission line of electricity standard, for common steel-cored aluminium strand, when operation leads The line surface temperature upper limit is 70 DEG C.
The conducting wire parameter includes wire type, conducting wire geometric parameter, conducting wire D.C. resistance;The environmental parameter includes wind Speed, environment temperature.
The Anti-icing Critical Current IfFor:
Wherein, h=1.043 (0.295Rc)-0.534va 0.466+0.0439Ta+4.39;
In formula, h is the coefficient of heat transfer for deicing rear conductive line surfaces, and unit is W/ (m2.℃);RcFor conducting wire geometric parameter i.e. half Diameter, unit m;vaFor wind speed, unit m/s;TaFor environment temperature, unit is DEG C;rTFor T DEG C of temperature when unit length lead Line D.C. resistance, unit are Ω/m.
The conducting wire tolerance electric current InFor:
The specific method for increasing transmission electric current is to reduce line voltage distribution, specifically, adjusting connecing for 4 controlled thyristor of current conversion station Feeler, due to the relationship of line current, voltage, transmission power:
In formula, I is line current, unit A;P is transmission power, unit kW;U is voltage, unit kV;
At this point, reducing line voltage distribution, it is possible to increase line current.
Wherein, it pilot temperature to be less than 70 DEG C, i.e., controls line current in InBelow.
Embodiment 2
For the above method, the present embodiment discloses the device for realizing the above method.
A kind of extra high voltage direct current transmission line on-load anti-icing system as shown in Figure 1, including circuit microclimate monitoring dress 1, anti-icing decision support apparatus 2 and power delivery circuit control device 3 are set, circuit microclimate monitoring device acquires extra-high voltage direct-current transmission The wind speed of circuit local environment, environment temperature parameter;Anti-icing decision support apparatus is according to wind speed, environment temperature parameter and power transmission line Line conductor parameter determines the Anti-icing Critical Current I of UHVDC Transmission LinesfWith conducting wire tolerance electric current In;Power delivery circuit control device Keep UHVDC Transmission Lines transmission power constant, control power delivery circuit electric current is more than or equal to Anti-icing Critical Current IfAnd less than resistance to By electric current In
Circuit microclimate monitoring device can have multiple, be separately mounted on different DC transmission line sections, to the road The weather information of section is acquired.Circuit microclimate monitoring device is sent to wind speed, environment temperature parameter by wireless network Anti-icing decision support apparatus 2, anti-icing decision support apparatus 2 are determined according to wind speed, environment temperature parameter, transmission line wire parameter The Anti-icing Critical Current I of UHVDC Transmission LinesfWith conducting wire tolerance electric current In, Anti-icing Critical Current IfIt determines, leads according to formula (1) Line is resistant to electric current and is determined according to formula (7).Anti-icing of Transmission Lines current control device conveys work(according to holding UHVDC Transmission Lines Rate is constant, and control power delivery circuit electric current is more than or equal to Anti-icing Critical Current If, while less than conducting wire tolerance electric current In
Microclimate monitoring device is equipped with the sensors such as temperature, humidity, wind speed, the gas such as difference collecting temperature, humidity and wind speed As parameter.Temperature sensor uses to be sent signal is acquired by wireless public network by the communication module being integrated on device simultaneously To anti-icing DSS.
Anti-icing DSS is server, and function one is to receive the microclimate being mounted on UHV transmission line Monitoring parameters of monitoring device, including monitoring point environment temperature, wind speed and humidity etc.;Function is second is that according to the microclimate received Parameter calculates the anti-icing electric current of UHV transmission line by formula (1);Function three is to be sent to calculated anti-icing electric current Anti-icing of Transmission Lines current control device.
Anti-icing of Transmission Lines current control device keeps DC power transmission line load constant according to the size of anti-icing electric current, Automatically DC power transmission line control strategy is provided, decision support is provided for DC power transmission line is anti-icing.
Above-described specific implementation mode has carried out further the purpose of the present invention, technical solution and advantageous effect It is described in detail, it should be understood that the foregoing is merely the specific implementation mode of the present invention, is not intended to limit the present invention Protection domain, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should all include Within protection scope of the present invention.

Claims (4)

1. the anti-icing method of extra high voltage direct current transmission line on-load, which is characterized in that include the following steps,
Obtain transmission line wire parameter and transmission line of electricity local environment parameter;
The Anti-icing Critical Current I of UHVDC Transmission Lines is determined according to above-mentioned parameterfWith conducting wire tolerance electric current In
It maintains UHVDC Transmission Lines transmission power constant, increases transmission electric current, line current is made to be more than or equal to anti-icing critical electricity Flow IfAnd less than conducting wire tolerance electric current In
The Anti-icing Critical Current IfFor:
Wherein, h=1.043 (0.295Rc)-0.534va 0.466+0.0439Ta+4.39;
In formula, h is the coefficient of heat transfer of conductive line surfaces, and unit is W/ (m2.℃);RcFor the radius of conducting wire, unit m;vaFor wind Speed, unit m/s;TaFor environment temperature, unit is DEG C;rTFor T DEG C of temperature when unit length conducting wire D.C. resistance, unit is Ω/m;
The conducting wire tolerance electric current InFor:
In formula:TMAXFor the allowable temperature of conducting wire, unit is DEG C;H is the coefficient of heat transfer of conductive line surfaces, and unit is W/ (m2.℃);Ac For effective energization area of conducting wire, unit m2;RxFor the radius of steel-cored aluminium strand steel core, unit m.
2. the anti-icing method of extra high voltage direct current transmission line on-load according to claim 1, which is characterized in that the conducting wire Parameter includes wire type, conducting wire geometric parameter, conducting wire D.C. resistance;The environmental parameter includes wind speed, environment temperature.
3. the anti-icing method of extra high voltage direct current transmission line on-load according to claim 1, which is characterized in that increase transmission Line voltage distribution is reduced while electric current.
4. extra high voltage direct current transmission line on-load anti-icing system, which is characterized in that including,
Circuit microclimate monitoring device:Acquire wind speed, the environment temperature parameter of extra high voltage direct current transmission line local environment;
Anti-icing decision support apparatus:Extra-high voltage direct-current line is determined according to wind speed, environment temperature parameter and transmission line wire parameter The Anti-icing Critical Current I on roadfWith conducting wire tolerance electric current In;The Anti-icing Critical Current IfFor:
Wherein, h=1.043 (0.295Rc)-0.534va 0.466+0.0439Ta+4.39;
In formula, h is the coefficient of heat transfer of conductive line surfaces, and unit is W/ (m2.℃);RcFor the radius of conducting wire, unit m;vaFor wind Speed, unit m/s;TaFor environment temperature, unit is DEG C;rTFor T DEG C of temperature when unit length conducting wire D.C. resistance, unit is Ω/m;
The conducting wire tolerance electric current InFor:
In formula:TMAXFor the allowable temperature of conducting wire, unit is DEG C;H is the coefficient of heat transfer of conductive line surfaces, and unit is W/ (m2.℃);Ac For effective energization area of conducting wire, unit m2;RxFor the radius of steel-cored aluminium strand steel core, unit m;
The anti-icing current control device of power delivery circuit:It keeps UHVDC Transmission Lines transmission power constant, controls power delivery circuit electric current More than or equal to Anti-icing Critical Current IfAnd less than conducting wire tolerance electric current In
CN201710517287.9A 2017-06-29 2017-06-29 The anti-icing method and system of extra high voltage direct current transmission line on-load Active CN107134740B (en)

Priority Applications (1)

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Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101752817A (en) * 2009-10-21 2010-06-23 湖南省电力公司调度通信局 Ice-over resistant on-line decision method of transmission line load circuits
CN102611062A (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 Method for determining parameters of transmission line overhead ground wire direct-current ice-melting device
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
CN106300199B (en) * 2015-05-29 2018-05-04 国家电网公司 A kind of ice melting system that output current is automatically adjusted according to icing line temperature
CN105911375B (en) * 2016-03-22 2018-06-15 国网江西省电力有限公司电力科学研究院 A kind of test method of distribution line icing critical current properties

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