Novel Current-Sensorless Control Approach for Single-Stage Buck-Boost Based EV charger

This paper proposes a novel sensorless control method for a simplified single-stage rectifier (SSSR) based electric vehicle (EV) charger. The proposed control strategy consists of three cascaded control loops, PI controller for DC link voltage regulation, another PI controller for grid current regulation, and a model predictive control (MPC) for inductor current regulation. Additionally, a novel state observer technique is proposed specifically for this topology, offering the advantages of simplicity, robustness, reduced number of tuned parameters, and compatibility with low-cost industrial microcontrollers. The effectiveness of the proposed control approach and observer technique is validated through extensive simulations across various scenarios and operating conditions, including boost operation, buck operation, and operation under uncertainties. The obtained results demonstrate the efficacy of the proposed method in achieving precise regulation of DC link voltage, grid current, and inductor current without the need for explicit inductor current sensor feedback.