CN107134740A - 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
CN107134740A
CN107134740A CN201710517287.9A CN201710517287A CN107134740A CN 107134740 A CN107134740 A CN 107134740A CN 201710517287 A CN201710517287 A CN 201710517287A CN 107134740 A CN107134740 A CN 107134740A
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Prior art keywords
icing
msub
wire
mrow
current
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CN201710517287.9A
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CN107134740B (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 comprises the following steps, and 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 wire tolerance electric current In;UHVDC Transmission Lines conveying power invariability is maintained, increase transmission electric current makes line current be more than or equal to Anti-icing Critical Current If, while less than wire tolerance electric current In, it is in ice-melt, it is not necessary to icing line outage.

Description

The anti-icing method and system of extra high voltage direct current transmission line on-load
Technical field
Prevented and reduced natural disasters technical field the present invention relates to power system, and in particular to a kind of UHVDC Transmission Lines are not stopping The method and system of line ice coating are prevented in the case of load.
Background technology
Icing is one of serious threat of power network safety operation.Serious icing has threatened the safety of extra high voltage line Stable operation, causes to have a strong impact on to bulk power grid stable operation.By taking ± 800kV brocades Su Zhiliu as an example, since being put into operation from 2012, 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 analogue for electric line and extra high voltage network.In order to prevent transmission line of electricity from tower occurring down because of serious icing, break Line, the accident stopped transport, often need to deploy ice-melt work according to line ice coating real-time condition.Current transmission line de-icing technology is needed 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, because the power supply capacity that line ice-melting needs is big, there is presently no sufficiently large ice-melt power supply.
The content of the invention
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, in ice-melt, it is not necessary to icing line outage.
The present invention is achieved through the following technical solutions:
The anti-icing method of extra high voltage direct current transmission line on-load, comprises 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 wire tolerance electric current In
UHVDC Transmission Lines conveying power invariability is maintained, increase transmission electric current makes line current be more than or equal to anti-icing face Boundary electric current If, while controlling transmission electric current is less than wire tolerance electric current In.It is resistant to electric current In right for the maximum temperature that line allows The electric current answered.
This programme realizes that the principle of ice-melt is in Anti-icing Critical Current I by line current controlfAbove, wire tolerance electric current InHereinafter, anti-icing purpose is realized 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 wire parameter includes wire type, wire geometric parameter, wire D.C. resistance;The ambient parameter includes wind Speed, environment temperature.
The Anti-icing Critical Current IfFor:
In formula, RcFor the radius of wire, unit is m;vaFor wind speed, unit is m/s;TaFor environment temperature, unit for DEG C; rTThe wire D.C. resistance of unit length during for T DEG C of temperature, unit is Ω/m;H is heat exchange coefficient, its calculate needs 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;DcFor diameter of wire, list Position is m;diFor ice covering thickness, unit is m;vaFor wind speed, unit is 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 are coefficient, for icing weather, C=0.683, n =0.466.
In deicing processes, ice sheet outer surface is radiated by way of convection heat transfer' heat-transfer by convection and radiant heat transfer to surrounding environment, 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 wirefFor:
In formula:TMAXFor the allowable temperature of wire, unit for 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 wire, unit For m2;RxFor the radius of steel-cored aluminium strand steel core, unit is 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 increase transmission electric current.
Extra high voltage direct current transmission line on-load anti-icing system, including,
Circuit microclimate monitoring device:Gather 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 wire tolerance electric current In
The anti-icing current control device of power delivery circuit:UHVDC Transmission Lines conveying power invariability is kept, power delivery circuit is controlled Electric current is more than or equal to Anti-icing Critical Current IfAnd less than tolerance electric current In
The present invention compared with prior art, has 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 wire is resistance to By electric current, in the case where maintaining UHVDC Transmission Lines conveying power invariability, increase transmission electric current reaches anti-icing purpose, has Effect accomplished do not have a power failure during anti-icing, the purpose of on-load, improve the stability and reliability of supply of electric power.
Brief description of the drawings
Accompanying 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.
1st, circuit microclimate monitoring device;2nd, anti-icing decision support apparatus;3 and power delivery circuit control device;4th, the change of current Stand.
Embodiment
For the object, technical solutions and advantages of the present invention are more clearly understood, with reference to embodiment and accompanying drawing, to this Invention is described in further detail, and exemplary embodiment and its explanation of the invention is only used for explaining the present invention, does not make For limitation of the invention.
Embodiment 1
The anti-icing method of extra high voltage direct current transmission line on-load, comprises 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 wire tolerance electric current In
UHVDC Transmission Lines conveying power invariability is maintained, increase transmission electric current makes line current be more than or equal to anti-icing face Boundary electric current IfAnd less than tolerance electric current In.According to China's transmission line of electricity standard regulation, for common steel-cored aluminium strand, led during operation The line surface temperature upper limit is 70 DEG C.
The wire parameter includes wire type, wire geometric parameter, wire D.C. resistance;The ambient 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.℃);RcIt is half for wire geometric parameter Footpath, unit is m;vaFor wind speed, unit is m/s;TaFor environment temperature, unit for DEG C;rTUnit length leads during for T DEG C of temperature Line D.C. resistance, unit is Ω/m.
The wire tolerance electric current InFor:
The specific method of increase transmission electric current is reduction line voltage distribution, specifically, adjusting connecing for the controlled thyristor of current conversion station 4 Feeler, due to line current, voltage, the relation for conveying power:
In formula, I is line current, and unit is A;P is conveying power, and unit is kW;U is voltage, and unit is kV;
Now, line voltage distribution is reduced, it is possible to increase line current.
Wherein, pilot temperature to be less than 70 DEG C, i.e., by line current control 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 Put 1, anti-icing decision support apparatus 2 and power delivery circuit control device 3, circuit microclimate monitoring device collection 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 wire tolerance electric current In;Power delivery circuit control device UHVDC Transmission Lines conveying power invariability is kept, 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 is determined according to wind speed, environment temperature parameter, transmission line wire parameter The Anti-icing Critical Current I of UHVDC Transmission LinesfWith wire tolerance electric current In, Anti-icing Critical Current IfDetermine, lead according to formula (1) Line tolerance electric current is determined according to formula (7).Anti-icing of Transmission Lines current control device is according to holding UHVDC Transmission Lines conveying work( Rate is constant, and control power delivery circuit electric current is more than or equal to Anti-icing Critical Current If, while less than wire tolerance electric current In
Microclimate monitoring device is equipped with the sensors such as temperature, humidity, wind speed, respectively the gas such as collecting temperature, humidity and wind speed As parameter.Temperature sensor by signal is gathered by the communication module being integrated on device by wireless public network using while sent To anti-icing DSS.
Anti-icing DSS is server, and its function one is to receive the microclimate being arranged on UHV transmission line The monitoring parameter of monitoring device, including monitoring point environment temperature, wind speed and humidity etc.;Function two is according to the microclimate received Parameter, the anti-icing electric current of UHV transmission line is calculated by formula (1);Function three is that the anti-icing electric current that will be calculated is sent to 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, is the anti-icing offer decision support of DC power transmission line.
Above-described embodiment, has been carried out further to the purpose of the present invention, technical scheme and beneficial effect Describe in detail, should be understood that the embodiment that the foregoing is only the present invention, be not intended to limit the present invention Protection domain, within the spirit and principles of the invention, any modification, equivalent substitution and improvements done etc. all should be included Within protection scope of the present invention.

Claims (5)

1. the anti-icing method of extra high voltage direct current transmission line on-load, it is characterised in that comprise 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 wire tolerance electric current In
UHVDC Transmission Lines conveying power invariability is maintained, increase transmission electric current makes line current be more than or equal to anti-icing critical electricity Flow IfAnd less than wire tolerance electric current In
2. the anti-icing method of extra high voltage direct current transmission line on-load according to claim 1, it is characterised in that the wire Parameter includes wire type, wire geometric parameter, wire D.C. resistance;The ambient 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, it is characterised in that described anti-icing Critical current IfFor:
<mrow> <msub> <mi>I</mi> <mi>f</mi> </msub> <mo>=</mo> <msqrt> <mfrac> <mrow> <mn>2</mn> <msub> <mi>&amp;pi;R</mi> <mi>c</mi> </msub> <mi>h</mi> <mrow> <mo>(</mo> <mn>0</mn> <mo>-</mo> <msub> <mi>T</mi> <mi>a</mi> </msub> <mo>)</mo> </mrow> </mrow> <msub> <mi>r</mi> <mi>T</mi> </msub> </mfrac> </msqrt> <mo>;</mo> </mrow>
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 wire, unit is m;
vaFor wind speed, unit is m/s;TaFor environment temperature, unit for DEG C;rTThe wire direct current of unit length during for T DEG C of temperature Resistance, unit is Ω/m;
Described wire tolerance electric current InFor:
<mrow> <msub> <mi>I</mi> <mi>n</mi> </msub> <mo>=</mo> <msqrt> <mfrac> <mrow> <mn>2</mn> <msub> <mi>R</mi> <mi>c</mi> </msub> <msub> <mi>A</mi> <mi>c</mi> </msub> <mi>h</mi> <mrow> <mo>(</mo> <msub> <mi>T</mi> <mrow> <mi>M</mi> <mi>A</mi> <mi>X</mi> </mrow> </msub> <mo>-</mo> <msub> <mi>T</mi> <mi>a</mi> </msub> <mo>)</mo> </mrow> </mrow> <mrow> <msub> <mi>r</mi> <mi>T</mi> </msub> <mrow> <mo>(</mo> <msubsup> <mi>R</mi> <mi>c</mi> <mn>2</mn> </msubsup> <mo>-</mo> <msubsup> <mi>R</mi> <mi>x</mi> <mn>2</mn> </msubsup> <mo>)</mo> </mrow> </mrow> </mfrac> </msqrt> </mrow>
In formula:TMAXFor the allowable temperature of wire, unit for DEG C;H is the coefficient of heat transfer of conductive line surfaces, and unit is W/ (m2.℃);Ac For effective energization area of wire, unit is m2;RxFor the radius of steel-cored aluminium strand steel core, unit is m.
4. the anti-icing method of extra high voltage direct current transmission line on-load according to claim 1, it is characterised in that increase transmission Line voltage distribution is reduced while electric current.
5. extra high voltage direct current transmission line on-load anti-icing system, it is characterised in that including,
Circuit microclimate monitoring device:Gather 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 wire tolerance electric current In
The anti-icing current control device of power delivery circuit:UHVDC Transmission Lines conveying power invariability is kept, power delivery circuit electric current is controlled More than or equal to Anti-icing Critical Current IfAnd less than 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)

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Citations (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
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
CN105911375A (en) * 2016-03-22 2016-08-31 国网江西省电力科学研究院 Test method of icing critical current characteristics of distribution line
CN106300199A (en) * 2015-05-29 2017-01-04 国家电网公司 A kind of ice melting system being automatically adjusted output electric current according to icing line temperature

Patent Citations (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
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
CN106300199A (en) * 2015-05-29 2017-01-04 国家电网公司 A kind of ice melting system being automatically adjusted output electric current according to icing line temperature
CN105911375A (en) * 2016-03-22 2016-08-31 国网江西省电力科学研究院 Test method of icing critical current characteristics of distribution line

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