Current regulation and fault tolerance in Double-Delta Sourced Transformer

The concept of Double-Delta Sourced Transformer (DDST) had been proposed to eliminate passive filters in large-scale power conversion systems. For the grid connection, active and reactive powers in DDST must be under control. In this paper, the power modulation method is proposed for DDST through the current regulation. And, it is also considered when one of converters is disconnected from the transformer. The effectiveness of the proposed method is discussed with experimental results through a proto-type set-up.