CN111082385A - Line ice melting method, current control method and device - Google Patents
Line ice melting method, current control method and device Download PDFInfo
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- CN111082385A CN111082385A CN201911286438.XA CN201911286438A CN111082385A CN 111082385 A CN111082385 A CN 111082385A CN 201911286438 A CN201911286438 A CN 201911286438A CN 111082385 A CN111082385 A CN 111082385A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G7/00—Overhead installations of electric lines or cables
- H02G7/16—Devices for removing snow or ice from lines or cables
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Abstract
The invention discloses a line ice melting method, a current control method and a device. Wherein, the method comprises the following steps: disconnecting the ground wires of the two base towers to be grounded; connecting direct current to the disconnected ground wire for heating, wherein the heating is used for melting ice; when the energizing direct current reaches a predetermined condition, energization of the ground wire is stopped. The invention solves the technical problem of difficult ice melting of the ground wire in the related technology.
Description
Technical Field
The invention relates to the technical field of line ice melting, in particular to a line ice melting method, a current control method and a current control device.
Background
Icing of the lines is also unavoidable due to environmental influences. In the prior art, an anti-icing and deicing method for deicing by heating power is generally adopted. The thermal ice melting method is to melt and peel off the ice coating on the electric wire by using an additional heat source or the self heating of the wire. In the aspect of thermal deicing, the power grid in some regions can realize remote deicing by using a short-circuit deicing scheme containing a communication network, but the technology is used for lines of 500KV and above and is easy to see the elbow. For example, a method for melting ice by using more heat is a direct current ice melting technology, and has the defects that an ice coating line needs to be disconnected from a power grid before melting ice, then a direct current power supply is applied after two leads are connected into a loop, and power supply can be recovered after melting ice; for another example, Sullivan and the like propose to melt ice by using a high-frequency excitation method of 8-200 KHz based on the characteristic that ice is a loss dielectric medium at high frequency, but the method needs to install a high-frequency high-voltage excitation device and an absorber on a deicing circuit, and the daily maintenance is troublesome; for another example, Brochu, Cluiter and the like use phase-shifting transformers to change power flow distribution of a power grid to melt ice on a power transmission line, the method has a large dependence on reactive power of a system, and the method has no experience of being applied to lines of 500kV or more at present.
In addition, the thermal ice melting method has large energy consumption, is difficult to determine the size of ice melting current, the electrifying time and the like, and cannot be used for melting ice on the ground wire.
For example, although the ac deicing only needs an ac power supply, the reactance of the high-voltage ac line is much larger than the resistance, so that the power supply capacity (mainly reactive power) required for the ac power supply deicing is large, and the method is limited by the power supply and the field environment and can be used only when permitted by the terrain and the surrounding environment.
Therefore, the problem of difficulty in deicing the ground wire still exists in the related art.
In view of the above problems, no effective solution has been proposed.
Disclosure of Invention
The embodiment of the invention provides a line ice melting method, a current control method and a device, which are used for at least solving the technical problem of difficulty in melting ice of a ground wire in the related technology.
According to an aspect of the embodiments of the present invention, there is provided a method for melting ice on a line, including: disconnecting the ground wires of the two base towers to be grounded; electrifying direct current to the disconnected ground wire for heating, wherein the heating is used for melting ice; and stopping the energization of the ground wire when the energization of the direct current reaches a predetermined condition.
Optionally, the heating the ground line after being disconnected by passing direct current comprises: presetting a fixed current value; after the ground wire is electrified with direct current, the fixed current value is determined to be reached; and heating the ground wire at the stable fixed current value.
Optionally, stabilizing the heating of the ground line at the fixed current value comprises: and stabilizing the current in the ground wire at the fixed current value by controlling the thyristor.
Optionally, stabilizing the heating of the ground line at the fixed current value comprises: acquiring a current value in the ground wire; and adjusting the current value in the ground wire according to the difference between the fixed current value and the current value in the ground wire until the current value is stabilized at the fixed current value.
Optionally, adjusting the current value in the ground line comprises taking the fixed current value as an input to a PI regulator, triggering α angular position of a pulse through the PI regulator to adjust the current value in the ground line.
According to another aspect of the embodiments of the present invention, there is also provided a current control method, including: acquiring a current value in a ground wire, wherein the ground wire is the current value of the ground wires of the two base towers after being disconnected from the ground and applying direct current; acquiring a preset fixed current value; and adjusting the current value in the ground wire according to the difference between the fixed current value and the current value in the ground wire until the current value is stabilized at the fixed current value.
Optionally, the method further comprises: and stopping the energization of the ground wire when the energization of the direct current reaches a predetermined condition.
Optionally, adjusting the current value in the ground line comprises taking the fixed current value as an input to a PI regulator, triggering α angular position of a pulse through the PI regulator to adjust the current value in the ground line.
According to another aspect of the embodiments of the present invention, there is also provided a current control apparatus including: the first acquisition module is used for acquiring a current value in a ground wire, wherein the ground wire is the current value of the ground wires of the two base towers after being disconnected from the ground and applied with direct current; the second acquisition module is used for acquiring a preset fixed current value; and the adjusting module is used for adjusting the current value in the ground wire according to the difference between the fixed current value and the current value in the ground wire until the current value is stabilized at the fixed current value.
Optionally, the method further comprises: and the stopping module is used for stopping electrifying the ground wire under the condition that the direct current reaches a preset condition.
In the embodiment of the invention, the ground wires of the two base towers are disconnected and grounded; electrifying direct current to the disconnected ground wire for heating, wherein the heating is used for melting ice; under the condition that the direct current reaches the preset condition, the power supply to the ground wire is stopped, and the ground wires of the two base towers after disconnection are heated by the direct current, so that the purpose of deicing the ground wires is achieved, the technical effects of effectively reducing energy consumption and dependence on a power supply and a field environment while deicing is realized, and the technical problem of difficulty in deicing the ground wires in the related technology is solved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a flow diagram of a method of line de-icing according to an embodiment of the invention;
FIG. 2 is a flow chart of a current control method according to an embodiment of the invention;
fig. 3 is a schematic diagram of a current control apparatus according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Example 1
In accordance with an embodiment of the present invention, there is provided an embodiment of a line de-icing method, it being noted that the steps illustrated in the flowchart of the figure may be performed in a computer system, such as a set of computer-executable instructions, and that while a logical order is illustrated in the flowchart, in some cases, the steps illustrated or described may be performed in an order different than that presented herein.
Fig. 1 is a flowchart of a line deicing method according to an embodiment of the present invention, and as shown in fig. 1, the line deicing method includes the following steps:
s102, disconnecting the ground wires of the two base towers and grounding the ground wires;
the ground wire includes but is not limited to a single-pitch ground wire;
step S104, enabling direct current to flow through the disconnected ground wire for heating, wherein the heating is used for melting ice;
and step S106, stopping electrifying the ground wire when the electrifying direct current reaches a preset condition.
Through the steps, the grounding of the ground wires of the two base towers can be disconnected; connecting direct current to the disconnected ground wire for heating, wherein the heating is used for melting ice; under the condition that the direct current reaches the preset condition, the electrifying of the ground wire is stopped, and the ground wires of the two base towers after disconnection are subjected to direct current heating, so that the purpose of deicing the ground wires is achieved, the technical effects of effectively reducing energy consumption and dependence on a power supply and a field environment while deicing is realized, and the technical problem of difficulty in deicing the ground wires in the related technology is solved.
It should be noted that the power supply capacity required by the direct current ice melting is small and the voltage is low compared with the alternating current ice melting, so that the possibility of flashover of ice coating insulation during ice melting is reduced, and the application is wider.
Optionally, the step of heating the disconnected ground line by direct current includes: presetting a fixed current value; after the ground wire is electrified with direct current, the fixed current value is determined to be reached; and heating the ground wire at a constant current value stably.
As an optional embodiment, the fixed current value may be obtained from a built ice melting model, where the ice melting model is obtained by training a large amount of training data through machine learning, and the training data includes an ice melting capacity and a fixed current value corresponding to the ice melting capacity. Through the ice melting model, a corresponding fixed current value can be obtained according to the preset ice melting capacity. It should be noted that, by the above manner, the fixed current value required for the heating of the ice-melting of the ground wire can be accurately predicted.
The ground wire is connected with a direct current power supply system, and the direct current power supply system is used for providing direct current for the ground wire to pass through. After the switch-on, the current in the ground wire can be made to reach a fixed current value, and the ground wire is further heated by stabilizing the current value at the fixed current value.
Through setting up fixed current value in advance to and adopt this fixed current value to heat the ground wire, can avoid letting in the too big or not good heating effect that the undersize caused of electric current, and then can effectively promote heating effect.
Optionally, stabilizing the heating of the ground line at the fixed current value comprises: the current in the ground line is stabilized at a fixed current value by controlling the thyristor.
As an optional embodiment, a three-phase 380V ac incoming line may be used, a predetermined number of thyristors may form a three-phase fully-controlled bridge, and a fixed current value may be output after rectification, and meanwhile, a resistor, a capacitor, etc. may be used for thyristor operation, phase-change overvoltage protection, and a fast-acting fuse may be used for overcurrent protection, so that the current in the ground line may be stabilized at a fixed current value.
Optionally, stabilizing the heating of the ground line at the fixed current value comprises: acquiring a current value in the ground wire; the current value in the ground line is adjusted according to the difference between the fixed current value and the current value in the ground line until the current value is stabilized at the fixed current value.
In order to ensure that the heating can be continued with a constant current value, the current value in the ground line may be adjusted according to the difference between the fixed current value and the current value in the ground line. Wherein, the current value in the ground wire can be adjusted according to the difference between the fixed current value and the current value in the ground wire; a difference threshold may also be predetermined, and the value of the current in the ground line may be adjusted when the difference between the fixed current value and the value of the current in the ground line is greater than or equal to the difference threshold. Of course, the practice is not limited to the above-described exemplary embodiments.
Optionally, adjusting the current value in the ground line includes taking a fixed current value as an input to the PI regulator, triggering α the angular position of the pulse through the PI regulator to adjust the current value in the ground line.
The PI regulator is a linear controller and can perform proportional regulation and/or integral regulation to adapt to different regulation requirements. By the mode, the current value in the ground wire can be accurately adjusted, and the current value is favorably stabilized.
An alternative embodiment of the invention is described below.
The ground wire is disconnected and grounded, the ground wire generates joule heat after being electrified, the ground wire needs to be heated firstly, then the heat is transferred to the ice layer and is transferred to the surface of the ice through the ice layer, so that the temperature of the surface of the ice is raised from the ambient temperature, and the surface of the ice and air exchange heat in the modes of radiation heat dissipation and convection heat dissipation. Therefore, in the process of deicing the ground wire, the surface temperature of the ground wire is highest, the temperature of the ground wire passing through the ice layer is gradually reduced, heat transfer is generated on the ice surface due to radiation and convection, a temperature gradient exists near the ice surface, and the temperature far enough outside the ice surface is the ambient temperature.
The deicing of the ground wire short circuit current comprises 2 heat exchange processes: 1) heat transfer from the ground and ice layers; 2) heat exchange between the ice surface and the air.
The device runs the ice melting mode, namely a fixed current mode, sets a running current value through a human-computer interface, and a regulator (PI regulator) obtains current feedback from a main circuit and compares the current feedback with the set value to be used as the input of the PI regulator, controls the α angular position of a trigger pulse after PI regulation, and achieves the aim of stabilizing current (plus or minus 1%) by controlling the thyristor.
The following describes each part of the above-described apparatus in detail.
1) The synchronous phase-locking filtering unit:
the device comprises the following components: the hardware comprises a digital signal processor (TMS320LF2407), a complex programmable Logic Device (CPLD for short) (EPM7192S) and the like. The application is as follows: the method comprises the steps of collecting a three-phase alternating current power supply, carrying out filtering processing, extracting fundamental waves, and carrying out digital phase locking to provide a reliable and accurate synchronous power supply for a trigger.
2) An adjustment trigger unit:
the device comprises hardware including devices such as a singlechip 89C51 and a CPLD (EPM 7192S). The function of the device is that current feedback is compared with a set value to be used as the input of a PI regulator, and the PI regulation is carried out to control the α angular position of trigger pulse.
3) Controlling the protection function:
the output direct current voltage, the output direct current and the like can be monitored and displayed, and the precision reaches level 1.
Control functions include start, stop, emergency stop, etc.
The alarm functions include over-current, over-voltage, phase loss, over-temperature, etc.
The protection function comprises overcurrent, overvoltage, phase loss, temperature rise and the like, the current protection can be subjected to constant value setting, a pair of overcurrent contacts is provided, when the set current is exceeded, the trigger signal is blocked, and the contacts act and alarm.
For example, the ground down leads of two adjacent base tower are thrown away and connected to the DC power supply system through a cable. A calculation formula of alternating current and direct current ice melting current and capacity is given, matlab related programs are written, ice melting capacity calculation is carried out on a typical ice-covered ground wire in a preset area, critical ice melting current is calculated, the capacity requirement of ice melting equipment is obtained, and a direct current power supply ice melting scheme is provided.
It should be noted that the ice melting device is also suitable for the direct-current ice melting work under the condition of ice coating of the 10KV distribution line through the short-circuit ground wire.
By the scheme, the problem of difficulty in deicing the ground wire can be solved, and meanwhile, the ground wire in the severe ice-coated section can be deiced in a more targeted manner, for example, the ground wire between the two base pole towers is deiced.
Example 2
In accordance with an embodiment of the present invention, there is provided an embodiment of a current control method, it should be noted that the steps illustrated in the flowchart of the accompanying drawings may be performed in a computer system such as a set of computer executable instructions, and that while a logical order is illustrated in the flowchart, in some cases the steps illustrated or described may be performed in an order different than here.
Fig. 2 is a flowchart of a current control method according to an embodiment of the present invention, as shown in fig. 2, the method including the steps of:
step S202, acquiring a current value in a ground wire, wherein the ground wire is the current value of the ground wires of the two base towers after being disconnected from the ground and applying direct current;
step S204, acquiring a preset fixed current value;
in step S206, the current value in the ground line is adjusted according to the difference between the fixed current value and the current value in the ground line until the current value is stabilized at the fixed current value.
According to the method, the purpose of deicing the ground wires is achieved by carrying out direct current on the ground wires of the two base towers after disconnection, so that the technical effects of effectively reducing energy consumption and dependence on a power supply and a field environment while deicing are realized, and the technical problem of difficulty in deicing the ground wires in the related technology is solved.
It should be noted that the power supply capacity required by the direct current ice melting is small and the voltage is low compared with the alternating current ice melting, so that the possibility of flashover of ice coating insulation during ice melting is reduced, and the application is wider.
Optionally, the method further includes: when the energizing direct current reaches a predetermined condition, energization of the ground wire is stopped.
The direct current is used for heating the disconnected ground wire, wherein the heating is used for melting ice; and under the condition that the direct current reaches a preset condition, namely the requirement of ice melting is met, the electrification of the ground wire can be stopped. Note that, the power supply to the ground wire is stopped at this time, indicating that the deicing of the ground wire has ended.
Optionally, adjusting the current value in the ground line includes taking a fixed current value as an input to the PI regulator, triggering α the angular position of the pulse through the PI regulator to adjust the current value in the ground line.
By the mode, the current value in the ground wire can be accurately adjusted, and the current value is favorably stabilized.
Example 3
According to another aspect of the embodiments of the present invention, there is also provided an embodiment of an apparatus for performing the current control method in embodiment 2 above, and fig. 3 is a schematic diagram of a current control apparatus according to an embodiment of the present invention, as shown in fig. 3, the current control apparatus includes: a first acquisition module 32, a second acquisition module 34, and an adjustment module 36. The current control device will be described in detail below.
The first obtaining module 32 is configured to obtain a current value in the ground wires, where the ground wires are the current values of the ground wires of the two base towers after being disconnected from the ground and applying direct current;
a second obtaining module 34, connected to the first obtaining module 32, for obtaining a preset fixed current value;
and an adjusting module 36, connected to the second obtaining module 34, for adjusting the current value in the ground line according to the difference between the fixed current value and the current value in the ground line until the current value is stabilized at the fixed current value.
The device can achieve the purpose of deicing the ground wires by carrying out direct current on the ground wires of the two base towers after disconnection, thereby realizing the technical effects of effectively reducing energy consumption and dependence on a power supply and a field environment while deicing, and further solving the technical problem of difficult deicing of the ground wires in the related technology.
It should be noted that the first obtaining module 32, the second obtaining module 34 and the adjusting module 36 correspond to steps S202 to S206 in embodiment 2, and the modules are the same as the corresponding steps in the implementation example and the application scenario, but are not limited to the disclosure in embodiment 2. It should be noted that the modules described above as part of an apparatus may be implemented in a computer system such as a set of computer-executable instructions.
Optionally, the method further comprises: and the stopping module is used for stopping electrifying the ground wire under the condition that the electrified direct current reaches a preset condition.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
In the above embodiments of the present invention, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In the embodiments provided in the present application, it should be understood that the disclosed technology can be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units may be a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, units or modules, and may be in an electrical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A method for melting ice on a line, comprising:
disconnecting the ground wires of the two base towers to be grounded;
electrifying direct current to the disconnected ground wire for heating, wherein the heating is used for melting ice;
and stopping the energization of the ground wire when the energization of the direct current reaches a predetermined condition.
2. The method of claim 1, wherein heating the disconnected ground line with direct current comprises:
presetting a fixed current value;
after the ground wire is electrified with direct current, the fixed current value is determined to be reached;
and heating the ground wire at the stable fixed current value.
3. The method of claim 2, wherein stabilizing the heating of the ground line at the fixed current value comprises:
and stabilizing the current in the ground wire at the fixed current value by controlling the thyristor.
4. The method of claim 2, wherein stabilizing the heating of the ground line at the fixed current value comprises:
acquiring a current value in the ground wire;
and adjusting the current value in the ground wire according to the difference between the fixed current value and the current value in the ground wire until the current value is stabilized at the fixed current value.
5. The method of claim 4, wherein adjusting the current value in the ground line comprises:
taking the fixed current value as an input of a PI regulator;
the angular position α of the pulse is triggered by the PI regulator to adjust the current value in the ground wire.
6. A current control method, comprising:
acquiring a current value in a ground wire, wherein the ground wire is the current value of the ground wires of the two base towers after being disconnected from the ground and applying direct current;
acquiring a preset fixed current value;
and adjusting the current value in the ground wire according to the difference between the fixed current value and the current value in the ground wire until the current value is stabilized at the fixed current value.
7. The method of claim 6, further comprising:
and stopping the energization of the ground wire when the energization of the direct current reaches a predetermined condition.
8. The method of claim 6, wherein adjusting the current value in the ground line comprises:
taking the fixed current value as an input of a PI regulator;
the angular position α of the pulse is triggered by the PI regulator to adjust the current value in the ground wire.
9. A current control device, comprising:
the first acquisition module is used for acquiring a current value in a ground wire, wherein the ground wire is the current value of the ground wires of the two base towers after being disconnected from the ground and applied with direct current;
the second acquisition module is used for acquiring a preset fixed current value;
and the adjusting module is used for adjusting the current value in the ground wire according to the difference between the fixed current value and the current value in the ground wire until the current value is stabilized at the fixed current value.
10. The apparatus of claim 9, further comprising:
and the stopping module is used for stopping electrifying the ground wire under the condition that the direct current reaches a preset condition.
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| CN201911286438.XA CN111082385A (en) | 2019-12-13 | 2019-12-13 | Line ice melting method, current control method and device |
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| CN201911286438.XA CN111082385A (en) | 2019-12-13 | 2019-12-13 | Line ice melting method, current control method and device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN118117525A (en) * | 2024-04-30 | 2024-05-31 | 杭州佳辰电力科技有限公司 | Control method of high-voltage direct-current ice melting device |
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| CN104600650A (en) * | 2015-01-08 | 2015-05-06 | 国家电网公司 | Lead wire and ground wire combined DC (direct current) deicing test method based on all-insulation ground wire technology |
| CN105098691A (en) * | 2015-09-15 | 2015-11-25 | 国网浙江省电力公司电力科学研究院 | Overhead ground wire ice melting device |
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| CN101369731A (en) * | 2008-10-08 | 2009-02-18 | 中国电力科学研究院 | Regulation control method of reconfigurable static reactive-power compensation/DC de-icing composite apparatus |
| CN103326299A (en) * | 2013-05-27 | 2013-09-25 | 南方电网科学研究院有限责任公司 | Starting method of overhead ground wire and composite optical fiber ground wire direct-current ice melting system |
| CN104600650A (en) * | 2015-01-08 | 2015-05-06 | 国家电网公司 | Lead wire and ground wire combined DC (direct current) deicing test method based on all-insulation ground wire technology |
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Application publication date: 20200428 |