Harmonic control in distorted voltage supply systems

Robust active filter control schemes for harmonic compensation of unbalanced loads in nonideal systems with the presence of distorted and unbalanced supply are proposed. New approaches in terms of supply reference current acquisition and current switching control are proposed for single and three phase applications which ensure that the supply current will remain sinusoidal by introducing modifications to the application of instantaneous power theory. Simulation results have clearly verified the effectiveness of the proposed scheme.