An effective harmonic elimination for DFIG feeding non-linear loads in stand-alone operation

This paper presents a new control method to compensate the harmonic components in case non-linear loads are connected to the stand-alone Doubly-Fed Induction Generator (DFIG). The load side converter (LSC) operates as an active filter to compensate the harmonics caused by the non-linear loads, and the controller for the active filter is developed by employing a proportional-integral and two resonant controllers in the fundamental reference frame. And also, the stator current is used as the feedback signal for the compensator instead of the load current. In addition, only low pass filter (LPF) is applied in control scheme, so that the control structure becomes simple with easy computation. The effectiveness of proposed compensator is validated by the simulation and experiment.