Power quality improvement using nonlinear-load compensation capability of variable speed DFIG based on DPC-SVM method

Abstract

This paper presents a novel method for power quality improvement of Wind Energy Conversion System (WECS) by compensation of grid harmonic currents produced by non-linear loads. The proposed method which has been applied to a Doubly Fed Induction Generator (DFIG) through rotor side converter(RSC), provides simultaneous speed control and power quality improvement. The Direct Power Control (DPC) method with constant switching frequency has been used for RSC control and power quality improvement has been performed by compensation of harmonic's active and reactive power of nonlinear load. Also, Grid Side Converter (GSC) control provides constant DC voltage for RSC and acts with unity power factor condition.