Renewable Powered EV Charger Based on Novel Five-Level Converter Controlled Using BELL Polynomials to Enhance Power Quality

This study presents a novel five-level converter (NFLC) architecture for integrating electric vehicle (EV) and photovoltaic (PV)-based micro-grid. The NFLC converter is designed with fewer switches, has reduced converter cost, and can be applied to systems in industries and power plants employing high power and medium-voltage ranges. There are two distinct DC-link connections on the NFLC. A new Bell polynomial-based controller is proposed in this paper for the control of NFLC. The proposed control method regulates almost identical values across the two DC-link voltages of the NFLC. Further, this new converter is connected to a single-phase power distribution system and used as a compensator. The grid, load, solar panel, compensator, and EV are modeled and integrated into the proposed system. The designed system is modeled in MATLAB/SIMULINK. The controller is designed to support the grid, and both charging and discharging the EV battery are feasible. Experimental validation is carried out using a hardware prototype created in the laboratory. The extraction of fundamental currents through the proposed Bell polynomials is compared with least mean square (LMS) and Bernoulli polynomial control algorithms. The NFLC seamlessly carried out grid-to-vehicle (G2V), vehicle–to-grid (V2G) operations in conjunction with a bidirectional DC-DC converter. The dynamic analysis using the BELL polynomial controller is also investigated during load variations.