High-voltage winding framework of high-power high-frequency transformer

Abstract

The invention discloses a high-voltage winding framework of a high-power high-frequency transformer. The high-voltage winding framework is of a multi-groove multi-coil independent output structure, namely, each groove comprises a coil, each coil is directly connected to an independent rectifier bridge, and finally, a plurality of rectifier bridges are connected in series to output to obtain a highvoltage. Each coil only needs to output a relatively low voltage, and the winding capacitance can be reduced. One equal-width partition plate is arranged between every two adjacent wire grooves, anda wire guide opening is reserved in each partition plate to serve as a lead-out opening of the first turn of winding in each wire groove, so that the mode that the first turn of winding is directly attached to and led out of other winding layers in the same wire groove can be avoided, and the insulation distance between the first turn of winding and the other winding layers is effectively increased. The creepage distance I refers to the shortest path between the (1i-1)th turn winding and the (i-1)th top layer winding of the (i-1)th wire groove; the creepage distance II is the shortest path between the (1i-1)th turn of winding and the ith top layer winding, and the creepage distance II is ensured to be at least twice of the creepage distance I by adjusting the width of the groove spacing plate and the depth of the wire groove.

Description

technical field [0001] The invention belongs to the technical field of power electronics, is mainly applied in high-power high-voltage DC converters, and relates to a high-voltage winding skeleton of high-power high-frequency transformers. Background technique [0002] For large-scale offshore wind farms, the DC converter with higher power density can be used to replace the bulky AC power frequency transformer in the traditional medium-voltage AC integration solution, which reduces transportation and installation costs. The capacity of the new energy medium-voltage DC collection system is usually relatively large, so it needs to be completed by a high-power DC converter. In medium-voltage and high-power applications, most high-power and high-boost ratio DC converters use high-power high-frequency transformers to achieve electrical isolation and voltage conversion between the medium and low voltage sides, which is a key component of the converter. In order to achieve a high ...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the difficulty in designing and developing high-power high-frequency transformers in high-power DC converters, the present invention provides a high-voltage winding skeleton for high-power high-frequency transformers, which can evenly distribute a large number of high-voltage windings and wind them in multiple slots , so as to achieve the purpose of reducing the parasitic capacitance of the winding and the difficulty of insulating a single wire slot

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