Three-phase coupling reactor and converter

Abstract

The invention discloses a three-phase coupling reactor and a converter. The three-phase coupling reactor comprises an iron core and six windings, the iron core comprises an upper iron yoke, a lower iron yoke, at least one first iron core post without a gas gap and three second iron core posts with gas gaps, wherein the first iron core post and the second iron core posts are located between the upper iron yoke and the lower iron yoke; two windings wind each second iron core post, and the ends of the two windings on the same second iron core post in different names are connected in a short circuit mode. According to the three-phase coupling reactor and converter, the zero sequence circulating current impedance of the converter system is increased through the coupling between windings, and accordingly the problem of uneven current of parallel power modules due to zero sequence circulating current is effectively solved.

Description

technical field [0001] The invention relates to the field of converters, in particular to a three-phase coupling reactor for suppressing zero-sequence circulating current in a converter. Background technique [0002] With the development of power electronics technology and products, large-capacity converters have gradually been widely used. In large-capacity converters, the current-carrying capacity of switching devices is generally improved by parallel connection of modules such as IGBTs and MOSFETs. However, there are often differences in the output characteristics, transfer characteristics, gate drive signal delay and other factors of parallel connected power modules. These differences will lead to zero-sequence circulating currents between parallel connected power An ideal current sharing state cannot be achieved, thereby limiting the use effect of the switching devices connected in parallel. [0003] In order to suppress another zero-sequence circulating current, an i...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a three-phase coupling reactor and a converter for the high cost and relatively complicated problem of suppressing zero-sequence circulating current in the converter with two power modules.

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