A novel current-tracking method for active filters based on a sinusoidal internal model

A new current control method based on the internal model Principle in contr ol theory is proposed. It introduces a sinusoidal internal model into the c ontrol system. It does not use any-coordinate transformations. The method c an be used for tracking an arbitrary number of harmonics: a de component or fundamental frequency component signal. It is applied to a single-phase pu lsewidth modulation inverter and active filter. The validity is confirmed b y simulation and experimental results.