PROJECT TITLE :

Energy Feed-Forward and Direct Feed-Forward Control for Solid-State Transformer

ABSTRACT:

There is massive voltage deviation on the dc bus of the 3-stage solid-state transformer (SST) when the load suddenly changes. The feed-forward management will effectively cut back the voltage deviation and transition time. But, conventional power feed-forward theme of SST cannot develop the feed-forward management to the full while not extra current sensor. In this letter, an energy feed-forward theme, that takes the energy changes of inductors into thought, is proposed for the twin active bridge (DAB) controller. A direct feed-forward scheme, that directly passes the power of DAB converter to the rectifier stage, is proposed for the rectifier controller. They can further improve the dynamic performances of the two dc bus voltages, respectively. The experimental results in a 2-kW SST prototype are provided to verify the proposed feed-forward schemes and show the superior performances.