Three-phase coupling reactor and converter

A technology of coupling reactance and converter, applied in the field of converters, can solve the problems of high cost and complexity of suppressing zero-sequence circulating current, and achieve the effects of increasing zero-sequence circulating current impedance, suppressing common mode current, and reducing volume

CN104078195BActive Publication Date: 2017-01-11SUZHOU INOVANCE TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2017-01-11

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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.
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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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Embodiment Construction

[0020] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0021] The three-phase coupling reactor of the present invention is applied to a converter with two parallel-connected power modules, and can suppress the zero-sequence circulating current generated by the parallel-connected power modules due to differences in output characteristics, transfer characteristics, and gate drive signal delays. The three-phase coupling reactor includes an iron core and six windings, and the above-mentioned iron core includes an upper iron yoke, a lower iron yoke, and at least one first iron core without an air gap respectively located between the upper iron yoke and the l...