Voltage stability augmentation of ig based wind farm using capacitor with exciter control system

Due to the recent expansion of renewable energy applications, wind energy conversion is receiving much interest all over the world. This is in no small part due to the rapid advances in the size of wind generators as well as the development of power electronics and their applicability in wind energy extraction, however, it has a great effect on the stability on power system. As wind turbine output is proportional to the cube of wind speed, the wind turbine generator output fluctuates due to wind speed variation. Thus this paper presents a new method to control the voltage stability by using reactive power compensation. It is observed that wind farm output voltage as well as grid voltage fluctuations can be controlled easily by applying this simple technique. Besides this, output voltage fluctuations can be smoothed by effectively controlling the reference voltage of the exciter of synchronous generator (SG). IEEE AC1A exciter is used in this study. Real wind speed data have been considered to obtained realistic responses. PSCAD/EMTDC software is used for simulation analyses.