Recently, a few three-phase PETs have been reported[
3][4], but they need either too many AC/DC
links, large bulky magnetic components or dc-link electrolytic
capacitors. Thus they are resulted in a rather
cumbersome solution and all the output loads are assumed
to be balanced. By far, an application of high
frequency link direct AC/AC three-phase four-wire matrix
type PET has not been presented in the literature.