Internal Model Control Scheme Based PV Battery Charging System Utilizing Buck Converter for EV Application

This paper presents the control of photovoltaic (PV) voltage using the Internal Model Control (IMC) technique, for battery charging systems utilizing the buck converter. The system consists of photovoltaic (PV) array, buck converter and battery. It has been modeled using small signal analysis. The proposed controller results fast and accurate tracking of reference PV voltage. This reference voltage is decided by MPPT under varying environmental conditions. To track this reference voltage, proposed IMC controller provides gate signal to buck converter. It exploits the full capacity of the PV panel. Also, it reduces switching stress, settling time and losses. Which cannot be achieved through direct duty cycle control (DDCC) of converter through Maximum Power Point Tracking (MPPT) algorithm. The efficiency of the proposed battery charging system has been evaluated under varying environmental conditions using MATLAB/Simulink. Finally, hardware results have verified the correctness and effectiveness of the proposed control strategy.