Modular High-Current Variable-Voltage Rectifiers

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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.