Finely adjustable diode rectifier type direct current ice melting device and method

A diode rectification, DC ice melting technology, applied in the direction of converting irreversible AC power input to DC power output, cable installation, overhead installation, etc. The output voltage is finely adjustable, the capacity and cost are reduced, and the effect is easy to control

Active Publication Date: 2018-06-05
STATE GRID HUNAN ELECTRIC POWER +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to meet the above-mentioned voltage output requirements, the existing diode rectification ice-melting device is generally realized by configuring more transformer gears (including configuring multiple transformers, and each transformer corresponds to several output voltage gears). The number of gears or even transformers is large and the cost is high; or only a few voltage gears are configured loosely. At this time, ther

Method used

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  • Finely adjustable diode rectifier type direct current ice melting device and method
  • Finely adjustable diode rectifier type direct current ice melting device and method

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Embodiment 1

[0021] This embodiment discloses a finely adjustable diode rectification type DC ice-melting device.

[0022] figure 1 It is a structural diagram of a diode rectification type DC ice-melting device with finely adjustable output voltage and current proposed by the present invention. Including coarse shift transformer, large capacity rectifier, fine shift transformer, small capacity rectifier, large capacity short circuit switch, small capacity short circuit switch. The primary side of the coarse-tuning transformer and the fine-tuning transformer are connected to the power grid, the secondary side of the coarse-tuning transformer is connected to the AC input side of the large-capacity rectifier, and the secondary side of the fine-tuning transformer is connected to the AC input side of the small-capacity rectifier The positive and negative poles of the DC output of the large-capacity rectifier are connected in parallel with both ends of the large-capacity short-circuit switch, t...

Embodiment 2

[0048] Corresponding to the finely adjustable diode rectification type DC ice melting device in the above-mentioned embodiment 1, this embodiment discloses a finely adjustable diode rectification type DC ice melting method, including:

[0049] Step S1: Transform and rectify the input of the AC power grid with a coarse-tuning transformer with a wide gear span and a corresponding large-capacity rectifier to obtain a large-capacity output voltage U on the DC output side of the large-capacity rectifier m1 .

[0050] Step S2: Transform and rectify the input of the AC power grid with a fine-tuning transformer with a narrow gear span and a corresponding small-capacity rectifier to obtain a small-capacity output voltage U on the DC output side of the small-capacity rectifier m2 .

[0051] Step S3, through a series circuit connecting the DC output side of the large-capacity rectifier and the DC output side of the small-capacity rectifier in series as the total ice-melting voltage of t...

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Abstract

The invention relates to the technical field of ice melting for power grids, and discloses a diode rectifier type direct current ice melting device and method with finely adjustable output voltage. Fine adjustment of direct current output voltage and current of the diode rectifier type direct current ice melting device within a relatively large range is realized by using a few of transformer gearpositions. The device comprises a coarse gear position adjustment transformer, a high-capacity rectifier, a fine gear position adjustment transformer and a low-capacity rectifier. The primary side ofthe coarse gear position adjustment transformer is connected with the power grid, and the secondary side of the coarse gear position adjustment transformer is provided with at least two gear positionswith relatively large span lengths; an output port is connected with the high-capacity rectifier; the primary side of the fine gear position adjustment transformer is connected with the power grid, and the secondary side of the fine gear position adjustment transformer is provided with at least two adjustable gear positions with relatively narrow span lengths; an output port of the fine gear position adjustment transformer is connected with the low-capacity rectifier; after the direct-current output sides of the high-capacity rectifier and the low-capacity rectifier are connected in series, atotal ice melting voltage is output. The diode rectifier type direct current ice melting device realizes fine adjustment of the ice melting output voltage of the diode rectifier type direct current ice melting device within a relatively large range only by using a few of transformer gear positions, and is relatively low in cost and high in ice melting performance.

Description

technical field [0001] The invention relates to the technical field of grid ice melting, in particular to a finely adjustable diode rectification type DC ice melting device and method. Background technique [0002] Ice and snow disasters occur frequently in southern China. Ice-covered power transmission lines are likely to cause disconnection and downturning, which seriously threatens the safe and stable operation of the power grid and the reliability of power supply. [0003] For this reason, various types of DC ice-melting devices have been developed in China. These devices can be divided into three types: uncontrolled rectification based on diodes, phase-controlled rectification based on thyristors, and fully-controlled rectification based on switching devices such as IGBTs. Among them, the harmonics on the grid-connected side of the fully-controlled rectifier-type ice-melting device are controllable and the DC voltage on the output side is continuously adjustable, and th...

Claims

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Application Information

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IPC IPC(8): H02G7/16H02M7/02
CPCH02G7/16H02M7/02
Inventor 陆佳政黄清军李波谭艳军朱思国朱远毛新果
Owner STATE GRID HUNAN ELECTRIC POWER
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