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Line ice-melting method for extra-high voltage DC electric transmission system

A technology of UHV DC and power transmission system, which is applied in the installation of cables, electrical components, overhead installation, etc., and can solve the problems of increased investment, power line icing accidents, waste, etc.

Inactive Publication Date: 2008-09-17
STATE GRID CORP OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In our country, there are few studies on the problem of icing on conductors. In the survey and design of power transmission lines, the scope and thickness of icing are expanded due to insufficient evidence, resulting in unnecessary huge waste; Insufficient ice design leads to frequent and severe icing accidents on power lines
When an ice damage accident occurs on the line, the weather is generally bad, the mountains are blocked by ice and snow, the traffic is blocked, the communication is interrupted, and it is very difficult to repair, which is very easy to cause a long-term power outage, causing huge losses to enterprises and society.
[0005] If the anti-icing design of the line is adopted, it is inevitable that a large amount of additional investment will be required

Method used

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  • Line ice-melting method for extra-high voltage DC electric transmission system
  • Line ice-melting method for extra-high voltage DC electric transmission system
  • Line ice-melting method for extra-high voltage DC electric transmission system

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Example 1: Two inverters with two poles

[0021] Figure 2 shows the parallel connection diagram of two DC deicing bipolar converters, which can use any converter of one pole and the high-end converter (C1 or C4) of the other pole to form a parallel connection. A high-side converter is necessary because the low-voltage side of the converter needs to withstand voltages of opposite polarity in a parallel connection. Taking converters C2 and C4 as an example, as shown in FIG. 2 , a connecting line is added at the low voltage end of C4 to the outside of the line isolating switch 20 of the other pole, that is, the connecting line between T1 and T2. If an isolating switch 17A is added on the connection line, online melting of ice can be realized. The process is as follows: first close the switches 20, 3, 5, 8, and 18, turn the converter C2 into the metal loop operation mode, close the switches 17A, 13, 16, and 21, so that the converter C4 is connected to the loop, Then inver...

Embodiment 2

[0022] Example 2: Two converters of the same pole are connected in parallel

[0023] Figure 3 is a wiring diagram of parallel connection of two converters of DC ice-melting single pole, in which two converters of the same pole are connected in parallel, that is, converters C1 and C2 in the figure, or converters C3 and C4 ; The opposite end converter station adopts the same wiring.

[0024] Taking converters C1 and C2 as an example, a connection line is added from the low-voltage end of converter C1 to the DC neutral line, that is, the connection line between T3 and T4. At the same time, an isolating switch 17B is added on the connection line between T1 and T2, and this solution can realize ice melting without power failure. First close the switches 20, 3, 5, 8, and 18, and the converter station is converted to the single-pole single-converter C2 metal loop operation, and then close the isolation switches 1 and 17B to start the high-end converter and increase the current . T...

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Abstract

A method for melting ice on line of super high voltage DC transmission system adds connection wire and switch in main wiring of super high voltage DC transverting station to change connection relation between transverters and to raise current on transmission line for melting ice on transmission line by changing on-off state of switch correspondingly.

Description

technical field [0001] The present invention relates to a method for melting ice of a UHV DC transmission system. More specifically, the present invention combines the characteristics of four converters in each UHV DC converter station by studying the ice melting current required by the line , which relates to a technical solution for a line melting method for an UHVDC power transmission system. Background technique [0002] UHV DC transmission system has large transmission capacity and long distance. Usually through multiple weather zones. If it is necessary to cross a wide range of severely ice-covered areas, the conventional anti-icing design of the line requires a lot of additional investment. At present, the power transmission project of the Southwest Hydropower Base planned by our country plans to use three ±800kV DC transmission lines to send to Central China and East China respectively. The transmission capacity of each line is 6.4 million kilowatts, and the DC cur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02G7/16
Inventor 刘振亚刘泽洪袁清云高理迎
Owner STATE GRID CORP OF CHINA
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