The following work introduces the use of a nine-switch back-to-back topology, for its use with multiphase permanent magnet synchronous generator, based wind energy conversion systems (WECS). The converter topology consists of a nine-switch dual channel back-to-back three-phase voltage source converter capable of controlling two sets of three-phase variables without voltage limitations when operating both three-phase systems at same frequency. This feature is exploited to control both ends of the PMSG and both terminals of a 12 pulse transformer for grid connection.
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Reusser et al. (2015) studied this question.
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