Firefly Algorithm in FOPI Controller for Improving Power Quality of Three-phase HES System Integrated UPQC

This paper concern on Firefly (FF) Algorithm for enhancing the power quality of three phase hybrid energy storage (HES) system integrated unified power quality conditioner (UPQC). Models are created for RES such PV arrays, BESS, and wind energy with the goal of supplying constant electricity. In general, the BESS can meet total load demand even when the PV array and wind turbine are not providing energy, which improves the stability of the distribution power system. The UPQC model with shunt and series active filter compensator is to reduce the grid's power quality problems and the harmonics which injected by non-linear loads. Furthermore, in the event of long voltage disruptions, PV, wind, and BESS integrated UPQC can manage power quality issues. While the load is protected from grid-related power quality problems by the series compensator, the shunt compensator of UPQC extracts power from hybrid energy systems. Therefore, the goal of this research is to create a FOPI controller with iso-damping properties in order to regulating the voltage of the DC link at the desired level. Particularly, the gain of PI controller (Kp, Ki, $\lambda$) are ideally tuned by a algorithm known Firefly Algorithm. In order to analyze the performance during voltage sag/swell, concerning the total harmonic distortion, the proposed method was implemented in MATLAB/Simulink. It is capable of producing competitive and promising results.