A novel selective control algorithm for the shunt active filter

This paper presents a novel selective control algorithm for a shunt active filter. Based on the proposed control algorithm, the active filter drains controlled currents in order to improve the performance of the passive filters and also to minimize a specific harmonic component of the system voltages. The controlled currents produced by the active filter are determined through the system voltages, together with the dc-link voltage. Load and system currents are no more measured. The control algorithm derives from the instantaneous power theory (pq-Theory), together with a synchronizing circuit. Comparative to similar algorithms observed in literature, the introduced one is simpler to be implemented since load-and system currents are no measured. Simulation results involving a selective active filter, with the proposed control algorithm, are presented in order to analyze its performance in transient and steady-state conditions.