Design of an Optimized Fractional-Order Fuzzy PID Based-SSSC Controller for Power System Oscillations Damping

This paper concerns the design of a novel supplementary controller employing wide-area signals for the Static Synchronous Series Compensator (SSSC). The proposed controller based on Fractional-Order Fuzzy Proportional Integral Derivative (FOFPID) is introduced to improve the dynamic stability and to minimize inter-area Low Frequency Oscillation (LFO) during transient conditions. The generators speed deviations are used as control signal and the regulator settings are tuned by means of Grey Wolf optimizer (GWO). Then, to clarify the advantage of the FOFPID controller against the integer PID and Fuzzy PID (FPID) an examination study was realized based on a two-machine two-area power system. According to simulation results, it was demonstrated that the designed SSSC-based FOFPID controller provides better performances for damping inter-area LFO compared to PID and FPID controllers.