An instantaneous active and reactive current component method for active filters

A shunt active filter based on the instantaneous active and reactive current component i(d)-i(q) method is proposed. This new control method aims to compensate harmonics and first harmonic unbalance. To evaluate its relative performance it is compared with the instantaneous active and reactive power p-q method under various mains voltage conditions and for different harmonic injection high-pass filters. Both methods are completely frequency-independent, however under distorted mains voltages the proposed method presents a better harmonic compensation performance. The system synthesis and implementation are performed. Simulation and experimental results are presented.