Two-way transmission converter applicable to high voltage and high power

Abstract

A bidirectional transmission convertor suitable for a high voltage and a high power, comprising a power module. The power module comprises a high-frequency transformer and modules of a full-bridge topological structure which are respectively connected to each phase of the primary side and the secondary side of the high-frequency transformer, wherein the modules of the full-bridge topological structure which are respectively connected to each phase of the primary side and the secondary side respectively comprise four modules SMp and four modules SMs, each bridge arm of the modules of the full-bridge topological structure which are connected to each phase of the primary side is respectively provided with one module SMp, and each bridge arm of the modules of the full-bridge topological structure which are connected to each phase of the secondary side is respectively provided with one module SMs. The convertor reduces the switching frequency and the switching loss of a power tube, reduces the electrical stress borne by a single tube, and improves the waveform quality of an alternating current link.

Description

Technical field: [0001] The invention relates to a converter, more specifically to a converter suitable for high voltage and high power bidirectional transmission. Background technique: [0002] The DC / DC converter developed from the DC chopper circuit in the low-voltage field is also called a DC transformer. In recent years, with the introduction of the concept of DC power grid, its application research in the field of high voltage and large capacity has received widespread attention from scholars at home and abroad. The resulting new topological types, simulation modeling technology and key technologies of high-frequency transformers have increasingly become research hotspots, among which the determination of topological types is the basis of research work. [0003] The most primitive topology of the DC / DC converter is a non-isolated single-tube DC chopper circuit, such as Buck circuit, Boost circuit, Buck-Boost circuit, Cuk circuit, Zeta circuit and SEPIC circuit. The po...

AI Technical Summary

Problems solved by technology

[0003] The most primitive topology of the DC / DC converter is a non-isolated single-tube DC chopper circuit, such as Buck circuit, Boost circuit, Buck-Boost circuit, Cuk circuit, Zeta circuit and SEPIC circuit. The power devices in the above circuits work In the hard switching state, the switching loss is large, and the operating frequency and efficiency are difficult to further improve

In the context of DC power grids, DC / DC converters need to be applied to wind farms connected to the grid, and DC grids of different voltage levels to be interconnected. The voltage level is high and the transmission capacity is large. These simple topology types are difficult to meet the application requirements. Therefore, the research is suitable for DC-DC converter topology for high voltage, high power transmission is very important

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