Modular High-Current Variable-Voltage Rectifiers

本课题的任务是基于模块化多级变流器（MMC）概念开发一种1mw级的大电流变压整流器。每个MMC模块，配备SiC器件，将辅以一个谐振槽和中频变压器。SiC器件的软开关将极大地减少损耗并允许更高的开关频率，从而使无源元件的尺寸缩小。作为最终目标，转换器的效率预计将达到98%，输入THD非常低，最先进的整流器尺寸约为50%。

The task of this project is to develop a high-current variable-voltage rectifier of the 1 MW class based on the concept of modular multi-level converter (MMC) concept. Each MMC module, equipped with SiC devices, will be supplemented by a resonant tank and medium frequency transformer. Soft switching of SiC devices will tremendously reduce losses and allow higher switching frequency so that the passive components shrink in size. As final goal, the converter's efficiency is expected to reach 98% efficiency with very low input THD and about 50% size of state-of-the-art rectifiers.