Single phase multifunctional grid integrated synchronous generator based wind energy generating system

The wind energy is considered to be clean and no waste producing renewable energy resource, but the lack of utilization techniques, restrict its use to full swing. The paper suggests an effective technique of single phase grid interfaced variable speed wind energy generating system (VSWEGS) using a wind turbine driven salient pole synchronous generator (SG). The proposed system has the ability to extract the maximum power of the wind energy generating system (WEGS) and even under sudden voltage changes such as voltage swell and sag the system performance remains intact. The generated power from the VSWEGS, is fed into the grid at unity power factor. The variable wind speed operation is realized effectively by using two power electronic converters (PEC) connected back to back at the intermediate DC link. The proportional integral (PI) controller maintains the DC link voltage at its reference value. The dynamic response of the proposed system is enhanced by including a wind-feed forward term. The performance of the system is verified by the experimental results. The grid current total harmonic distortion (THD) is found to be less than 5%, which meets an IEEE-519 standard.