A Current Control Method for Active Filters Using Sinusoidal Internal Model

Abstract

A new current control method based on the internal model principle in control theory is proposed. It uses a sinusoidal internal model, but it does not use any coordinate transformations. The method can be used for tracking an arbitrary number of harmonics, a DC component or a fundamental frequency component signal. It is applied to a single-phase PWM inverter and an active filter. Simulation and experimental results confirm the validity of the proposed method.