Equivalent 24-pulse uncontrolled rectification DC ice melting device

Abstract

The invention discloses an equivalent 24 pulse wave non-control rectification DC thawing apparatus which is composed of a 12 pulse wave rectifier transformer (1), a first three-phase bridge non-control rectifier (2), a second three-phase bridge non-control rectifier (3), a variable-tap parallel reactor (4) and a frequency multiplier circuit (5) which are connected in series, wherein the 12 pulse wave rectifier transformer (1) is provided with a three-phase output end connected with the input end of the first three-phase bridge non-control rectifier (2), and the three-phase output end is connected with the input end of the second three-phase bridge non-control rectifier (3). Two output ends of the variable-tap parallel reactor (4) are correspondingly connected with two input ends of the frequency multiplier circuit (5). The apparatus has the advantages of simple structure, wide thawing applicability, low investment, small occupation area, high cost performance, low pollution on the power grid, and smooth waveform, and is easy to operate and simple to maintain, thereby saving both human resources and material resources.

Description

technical field [0001] The invention belongs to the technical field of electrical engineering, and in particular relates to an equivalent 24-pulse uncontrolled rectification and direct current ice-melting device. Background technique [0002] Winter icing of transmission lines is one of the major natural disasters in power systems. Guizhou, Hunan, Hubei, Jiangxi and other provinces are located in the central and southern hinterland, and their unique topographical structure and climate environment characteristics lead to frequent outbreaks of large-scale ice disasters. For example, the continuous low temperature and freezing weather in early 2008 caused large areas of transmission lines in the southern region to be covered with ice, and many main lines collapsed and disconnected, resulting in large-scale power outages and a major impact on the national economy. After the ice disaster in 2008, in order to resist the ice disaster of transmission lines, scientific research unit...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a new type of equivalent 24-pulse for the existing six-pulse and twelve-pulse DC ice-melting devices with relatively large harmonic current on the AC side, which increases the noise and loss of distribution transformers. Wave uncontrolled rectification DC ice-melting device to meet the needs of the transmission line melting process, reduce the harmonic current interference of the ice-melting power transformer, the device strives for less investment, simple operation and maintenance

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