Structures of Repetitive Controllers Based on GDSC with Feedforward Action

This work presents a vector repetitive control scheme for three-phase systems, based on the generalized delayed signal cancelation transform. Three proposed control structures are presented, allowing to regulate a family of harmonic components (nk+m, k Z), where the negative harmonics indicate negative-sequence components. Differently from most repetitive controllers, distinct negative- and positive-sequence components can be regulated. A stability evaluation is presented. Experimental results are shown in order to validate the proposed control scheme and demonstrate its good performance when applied to a three-phase active power filter.