Different control objectives under stationary frame for grid-connected converter under unbalanced grid voltage

The mathematical model and the instantaneous power model of the grid-connected converter in the stationary αβ reference frame are introduced in this paper. In order to implement different control objectives, the reference currents are derived in the stationary αβ reference frame. In this paper, an deadbeat control (DBC) method is used to achieve different control objectives under unbalanced grid voltage. It can be observed that the positive and negative sequence components do not need to be separated from the feedback grid-connected currents under unbalanced grid voltage. Meanwhile, a phase lock loop algorithm can be avoided. Finally, the experimental setup of three-phase grid-connected converter is built, and then the effectiveness of this method is verified by experiments.