Active filtering capability of WECS with DFIG for grid power quality improvement

A doubly fed induction generator (DFIG) with active filtering capability is presented. We proposed to make use of the DFIG and the associated rotor side converter (RSC) to control stator active and reactive power and simultaneously compensate the most significant and troublesome harmonic currents of the utility grid. We presented a new high selectivity harmonic isolator based on self tuning filter (STF). Simulation results when filtering the harmonic component of the grid current validate the performances of the harmonic isolator principle and the active filtering capability of the DFIG.