Impacts of wind energy conversion system based on doubly fed induction generator on power quality

The wind generation installations are growing substantially in the world. Many of these installations are significant in size and directly connected to the bulk transmission system. However, as wind generation costs continue to decline, distributed installations of one or more large turbines are becoming more common. Asynchronous generators are the most common type found in wind energy applications today. These generators provide low initial cost, can withstand large torque variations, and are relatively simple to operate and maintain. Basically two types of this are used: direct-connected induction generator (IG), and doubly-fed induction machines (DFIG). In this paper using a typical distribution feeder, impact on the magnitude of the voltage and distortion of the current waveform for IG and DFIG are presented and compared.