Cascaded Controller Tuned UPQC for PQ Enhancement in EV Connected Charging Station

Abstract

Power grids are a byproduct of the development of conventional power systems. They comprise electronic power converters and a variety of renewable energy sources. Power quality (PQ) controllers for renewable sources have been modeled in order to handle the high energy demand. Although numerous solutions have been utilized thus far, the PQ issue demands specific consideration. Hence, the unified power quality conditioner (UPQC) is proposed to address the problem of PQ enhancement in electric vehicle (EV) connected charging stations (CS). For tuning UPQC, the tilt and proportional integral derivatives are cascaded (C-TI-PI) together. In addition, the golden search optimization algorithm (GSOA) is included to control the battery's charging behavior of the bidirectional buck boost converter. The implementation is carried out through MATLAB/Simulink, and the observed result shows the stability and efficacy of the proposed controller. The implementation results are analyzed through two cases to validate the robustness of a proposed C-TI-PI-based UPQC controller. Moreover, the total harmonic distortions (THD) are also determined for the proposed strategy and compared with the traditional methods. The overall characteristic response reveals the effectiveness of a proposed controller.