Modified grid side converter control technique for DFIG connected to nonlinear loads

Abstract

ABSTRACT In this work, a grid side converter (GSC) control with integrated shunt active filtering function using space vector pulse width modulation (SVPWM) technique is proposed to mitigate harmonics produced by the nonlinear loads. This method is focused on removal of harmonics from the grid currents by supplying compensating currents through GSC of DFIG. The proposed control technique improves power quality and reduces Total Harmonic Distortion of the grid current. Simultaneously, it is also capable to control active power and regulate DC link voltage during variable wind speeds in the presence of nonlinear loads. Performance of the proposed technique is compared with the conventional technique considering grid-connected 2.6 MW DFIG-based wind energy conversion system using MATLAB Simulink. Performance analysis has been carried out to check the behavior of the proposed SVPWM-based modified GSC control technique to mitigate the grid current harmonics considering wide variations in various parameters. The simulation results validate the effectiveness of the proposed scheme since it achieved grid current THD within limits of 5% as per IEEE-519 standards for all wind speeds.