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Transmission line ice melting device

A power transmission line and ice-melting technology, which is applied in the installation of cables, electrical components, overhead installation, etc., can solve the problems of less use time, large harmonic current, idle ice-melting device, etc., and achieve the effect of improving the utilization rate

Active Publication Date: 2017-03-15
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ice melting device with this structure has the following defects: defect 1, large harmonic currents are generated during the operation of the ice melting device, and a filtering device with a certain capacity needs to be added to the input side of the device; defect 2, the utilization rate of the ice melting device is low, and the investment within one year The running time is very little. If the line is not seriously iced, the ice melting device may not be put into real use for a year or even several years, causing the ice melting device to be idle in the substation for many years

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0011] Implementation mode one: from figure 1 It can be seen that the present invention includes a transformer 1 and a diode rectifier bridge (4, 5), and also includes a three-phase voltage source converter and an AC output filter (2, 3), and the diode rectifier bridge (4, 5) adopts a three-phase full bridge Diode rectifier bridge, transformer 1 adopts a three-winding transformer, one of the windings in the three-winding transformer is a three-phase primary winding, and the other two windings are three-phase secondary windings, and the corresponding three-phase voltage source converter and AC output filter (2, 3), diode rectifier bridges (4, 5) also have two groups respectively, the A / B / C terminals of the primary side of the transformer 1 are connected to the three-phase AC power supply, and the first three-phase secondary winding of the transformer 1 Respectively connected to the three-phase AC output terminals U1 / V1 / W1 of the first group of three-phase voltage source convers...

Embodiment approach 2

[0013] Embodiment 2: The difference between this embodiment and Embodiment 1 is that its three-phase voltage source converter and AC output filter are three-level. Compared with Embodiment 1, it can realize high voltage by connecting power electronic devices in series. Output, without additional step-down transformers and step-up transformers, but when the output reactive power capacity is large (greater than 1000kvar), it is necessary to introduce power electronic components in parallel to achieve high current output, and at the same time connect power electronic components in series and in parallel It is a difficult point, and it is easy to reduce the reliability of device operation. This structure should be adopted when the output voltage is high and the capacity is small.

Embodiment approach 3

[0014] Embodiment 3: The difference between this embodiment and Embodiment 1 is that its three-phase voltage source converter and AC output filter are chained multi-level, and low-voltage power electronic devices are used to form power modules, and the power modules can be connected in series. Realize high voltage and large reactive capacity output. This structure should be adopted when the output voltage is high and the capacity is large.

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PUM

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Abstract

The invention discloses an ice melting device for an electric transmission line. The ice melting device for the electric transmission line comprises a transformer, a diode rectification bridge and a three-phase voltage source transformation and alternating-current outputting filter, wherein a secondary winding of the transformer is respectively connected with a three-phase alternating-current outputting end of the three-phase voltage source transformation and alternating-current outputting filter and three alternating-current inputting ends of the diode rectification bridge; and the three-phase voltage source transformation and alternating-current outputting filter mainly comprises a three-phase voltage source transformation circuit and a three-phase filtering circuit, and is used for transforming a three-phase voltage source, compensating harmonic current generated by the diode rectification bridge when the ice melting device runs in an ice melting mode and performing dynamic reactive power compensation when the ice melting device does not run in the ice melting mode, so that the utilization rate of the ice melting transformer is improved.

Description

technical field [0001] The invention relates to the technical field of electrical engineering, in particular to an ice-melting device with active reactive power compensation and filtering functions. Background technique [0002] When a freezing accident occurs in winter, the transmission line needs to use an ice-melting device to inject a certain amount of current into the transmission line to heat the transmission line and then melt the ice. The size of the DC output voltage can adjust the size of the current in the transmission line. In order to ensure the high reliability of the ice-melting device, in the prior art, step-down transformers and diode rectifiers are generally used as the ice-melting device to realize the DC power output of the ice-melting device. However, the ice melting device with this structure has the following defects: defect 1, large harmonic currents are generated during the operation of the ice melting device, and a filtering device with a certain c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02G7/16H02J3/18
CPCY02E40/30
Inventor 陆佳政朱思国谭艳军李波方针张红先
Owner STATE GRID CORP OF CHINA