Design of single-phase active power filter using analogue cascade controller

A very-low-cost active power filter with power-factor-correction capability for solving power quality problem is proposed. Model-based cascade controller design is presented for the control of the shunt active filter. Harmonic reductions and power-factor correction will both be carried out by the proposed filter. Discussions on the design of the current and voltage control loops are given. Circuit implementation of the proposed control scheme is presented and experimental results are included to demonstrate the effectiveness of the proposed design scheme.