Robust active power filter for power quality improvement under fast load variation

This paper presents a new control strategy to improve the dynamic behavior of the shunt active power filter operated under fast load variation. Employing this strategy, the active power filter compensates harmonics and reactive power generated by the nonlinear-load simultaneously and will be robust under fast load variation condition. The proposed control strategy is tested for wide range of variable load current and results are found to be quite satisfactory to mitigate harmonics and reactive power components from the utility current.