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Single phase uninterruptible power supply (UPS) has been widely used for a variety of critical load to overcome the disruption in utility power supplies. Wide band gap (WBG) power semiconductor devices, such as Silicon Carbide (SiC) finds its application in UPS systems due to its higher switching frequency, lower losses, and higher power density compared to Si devices. In this paper, a full SiC-based...
Power Electronic Transformer (PET) is one of the most prospective components for future power electronics based power distribution systems. In this paper, the issue of the series-connected voltage sharing and the parallel-connected current sharing of a three-stage H-bridge based PET is discussed. Based on the present overall control strategy and application, it finds that the output-stage parallel-connected...
Power electronic transformer (PET) has many merits as compared with traditional power transformer. In this paper, the unbalanced-load handling capability of two H-bridge based modular PET topologies, the separate-phase-connection (SPC) one and the cross-phase-connection (CPC) one, are analyzed. The two topologies consist of input stage, isolation stage and output stage. The related operating ranges...
Power Electronic Transformer (PET) is one of the key elements for the future power electronics based power supply systems, especially in renewable energy field. In this paper, a series of new three-stage three-phase cascaded modular topologies comprising distinct AC-DC, DC-DC and DC-AC stages for large power rating PET are proposed. Comparisons of these topologies based on efficiency, cost, redundancy,...
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