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Compared with conventional power transformer, the power electronic transformer (PET) or solid-state transformer has many attractive additional features. This paper focuses on an H-bridge-based three-phase three-stage modular PET, which consists of an input stage with series-connected H-bridge converters, an isolation stage with several independent dual-active-bridge converters, and an output stage...
This paper compares the unbalanced load correction capacity between four different PET topologies: the SPC modular topology, the CPC modular topology, the modular self-balancing topology and a proposed MAB based self-balancing topology. The theoretical analysis show that the SPC and CPC can only achieve unbalanced load compensation within a limited range and both of them require additional power rating...
One cycle PFC technique has advantages of AC voltage sensor elimination and simplified current loop, thus it has been utilized on various rectifier topologies. In this paper, a modified one cycle PFC method for the delta-connected cascade H bridge (CHB) rectifier is proposed, which combines the one cycle PFC control, zero sequence current injection control and DC voltage balancing control. With the...
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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