Application of repetitive control for removal of harmonic distortions from inverter output

TLDR: In this paper, the harmonic distortions caused due to nonlinear loads may not get corrected by simple PID controllers and repetitive controllers are more effective in such situations, therefore, they are used as add-on block to the conventional PID controller.

Abstract: It is mandatory to keep total harmonic distortion in output of most inverters below a prescribed limit. The harmonic distortions caused due to non-linear loads may not get corrected by simple PID controllers. Repetitive controllers are more effective in such situations. Often repetitive controllers are used as add-on block to the conventional PID controller. Design of repetitive controller can be easily implemented on digital platform. Some controller parameters may have to be decided on trial and error basis.