Single-phase five-column low-noise converter transformer and its realization method

Abstract

The invention discloses a single-phase five-post low-noise converter transformer and an implementation method thereof. The single-phase five-post converter transformer is connected with a converter for alternating current and direct current conversion. The six single-phase five-post converter transformers are divided into two groups to be connected and used for ultrahigh-voltage direct-current transmission. Two iron core center posts of each transformer are wound with three windings respectively, the windings on outer sides of iron cores are line side windings, the windings on the inner sides are valve side windings, and the middle windings are specially designed filter windings which are directly connected in a delta connection manner. By the single-phase five-post low-noise converter, noise of the transformer can be reduced effectively, and harmonic wave is reduced.

Description

technical field [0001] The invention relates to the field of converter transformers, in particular to a single-phase five-column low-noise converter transformer used in the field of ultra-high voltage direct current transmission and a realization method thereof. Background technique [0002] Over the past 20 years, high-voltage direct current transmission technology and its engineering applications have developed rapidly in my country. As my country's ultra-high voltage and ultra-high voltage direct current transmission projects continue to be put into operation, many urgent needs have also been encountered during project construction and actual operation. Solved technical problems. [0003] In the UHV DC transmission project, the converter transformer is generally limited by the transportation or installation height, so it is necessary to try to reduce the height of the iron core. In order to solve the problem that the height of the large-scale three-iron core column transfo...

AI Technical Summary

Problems solved by technology

[0004] Moreover, the harmonic pollution in EHV and UHV DC transmission systems and their converter stations is serious. At present, passive filtering devices are still installed on the winding side of the converter transformer grid side for treatment. Although the technology of the scheme is mature, the effect is not ideal.

Moreover, all the AC harmonics generated by the converter flow through the converter transformer. These harmonics have low frequency and large capacity, which will cause the hysteresis of the converter transformer to generate noise.

These noises are generally in the frequency band where the hearing is more sensitive, so the audible noise generated by the converter transformer is more complicated than that of ordinary power transformers with less serious harmonic pollution.

[0005] Domestic and foreign research on the vibration and noise of converter transformers is not deep enough. Using traditional control measures requires additional capital investment of tens of millions of yuan for each converter station. The investment is huge and the effect is limited.

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