Cascade module unit applied to power electronic transformer

Abstract

The invention provides a cascade module unit applied to a power electronic transformer. The cascade module unit comprises a power module, a power unit board, a thermal management component, a currentdetection component, a redundant loop component, a loop connection component and a module shell, adopts a cascade H-bridge CHB topology, and adopts a star connection method to perform multi-module series connection. The cascade module unit solves the problem of insufficient withstand voltage of a single power electronic device IGBT. The cascade module unit has the advantages that the modular degree of the internal components is high, and the assembly is convenient; the whole module is convenient to assemble, electrical connection can be rapidly achieved, and a hot plug function is achieved; the air volume of a fan is utilized to the maximum extent, and the overall module cooling efficiency is high; a redundancy function is achieved, and the reliability of the system is high; the volume weight is small, and the power density is high; and the overall demetallization degree of the module is higher, the creepage distance and the electrical gap are ensured, and the safety of the module unitis high.

Description

Technical field [0001] The present invention relates to the field of power electronics, and more particularly to a cascade module unit applied to a power electron transformer. Background technique [0002] Conventional power frequency transformers have shortcomings with large volume, high loss, slow failure, waveform easy to distortion, and power electron transformers as new distribution equipment, without traditional transformers, and achieve power conversion, strong electrical isolation, dynamic electrical energy Adjustment and other functions to meet the needs of smart grids. [0003] Power electron transformers typically adopt a modular grade zoom, generally composed of high pressure modules, high-frequency transformers, low pressure modules. The high-voltage side module module located close to the middle piezoelectric grid is directly connected to the 10kV grid. The main function is to absorb the energy required for DC load from the grid and passed to the load through the in...

AI Technical Summary

Problems solved by technology

The structure of the high-voltage side at one end of the existing medium-voltage power grid is various, most of which are designed as an integrated structure, which is inconvenient for assembly, low overall heat dissipation efficiency, long production and assembly period, unable to realize online live hot swapping, and the degree of metallization of the overall structure is relatively low. Problems such as high insulation protection are not easy to deal with

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