Dynamic Stability Improvement of a Variable Wind Integrated Power System by Fractional Parallel SSSC Controller

Dynamic stability pertaining to random wind penetration is a challenging task for power system operators. In this work, a new SSSC fractional order parallel (FOP) controller is proposed for dynamic stability enhancement of such an integrated power system. The proposed controller is a cascaded combination of fractional order PI with parallel lead-lag controller. Here the modulation index and phase angle of SSSC are simultaneously controlled to damp low frequency oscillation when power system is subjected to variable wind energy penetration. The parameters of the controller are tuned by lightning search algorithm, which has been compared with PSO and DE algorithm. Frequency and time domain simulation with random wind penetration has been performed with Eigen value analysis which justified that proposed SSSC fractional order parallel controller can damp system oscillation much effectively in comparison to optimal PI and lead-lag controller.