Publication

Abstract : This work focuses on hybrid energy storage system (HESS) development for electric vehicle (EV) applications. Conventionally in EVs, only battery is used as a primary energy source for all the operations of the vehicle. The vehicle machine draws high current during certain conditions like acceleration and braking leading to more stress on the battery and thereby decreasing its efficiency and lifetime. A hybrid energy storage system (HESS) will significantly reduce the burden on a single supply source to the EV. Here two combinations of HESS are compared, and supercapacitor is used in combination with a battery and with a fuel cell. The battery/fuel cell (FC) acts as the primary source of supply while the supercapacitor (SC) will act as the secondary source of supply during sudden acceleration and braking, thereby reducing the stress on the primary source and thus enhancing the life of the devices on the long run. The two HESS combinations, battery with SC and FC with SC are interconnected to suitable DC-DC converter topologies for meeting the power and the load requirements. The proposed HESS is integrated into an EV motor, namely brushless DC motor (BLDC). The suitable HESS with EV motor performance is assessed using MATLAB/Simulink and validated with hardware implementation based on different drive cycle scenarios.