Dynamic stability improvement of a solar penetrated power system by Fractional optimal IPFC based controller

Fractional interline power flow controller (IPFC) is proposed in this work for enhancing dynamic stability of a random solar penetrated power system. IPFC being a series-series FACTS device is much versatile damping controller. Here the damping action is provided by IPFC based fractional lead-lag controller. The controller gains are optimized by a random walk grey wolf optimizer (RGWO). A random variation in solar output is more prone to system oscillations as compared to fix solar generation. So separate cases have been conducted in this work pertaining to step and random solar power variations. The effectiveness of proposed control action has been compared with lead-lag controller and proposed optimization technique with standard PSO and GWO algorithms. Detail analysis has been performed in time domain with eigen analysis and it is found that fractional RGWO tuned IPFC is much robust to damp system oscillations subject to variable solar penetration in comparison to PSO and GWO tuned lead-lag controller.