Improvement of small signal stability of solar integrated power system by UPFC based optimal controller

In this work a parallel fuzzy PID controller is proposed for enhancing small signal stability of variable solar integrated power system. The controller parameters are tuned by DE-GWO technique. With increase in solar penetration the system oscillations are found to be more aggravated subject to sudden variation in solar output. Time domain simulation has been performed with detail eigen value analysis to justify the effectiveness of controller. The system response predict that proposed controller can damp system oscillations much heavily in contrast to single fuzzy PID controller optimized by DE and GWO techniques.