Enhanced Regenerative Braking System for Electric Vechile with High Power Density Storage

This work presents the implementation of regenerative braking method of Interior Permanent Magnet Synchronous Motor(IPMSM) in electric vehicle(EV) with a battery/High-power density element Hybrid Energy Storage System(HESS). The Regenerative Braking(RB) control of IPMSM and transfer of brake energy to a High-power density element in EV model are the main objectives this work. The proposed system uses a bidirectional dc/dc converter(BDC) to interface between the battery and the ultra/super capacitor. It helps to maintain the ultra/super capacitor voltage higher than the voltage across the battery for the most urban driving scenarios. The ultra/super capacitor is receives the peak power from the RB and protects the battery being burdened with over charging. So, the limitation of overcharging of battery as well as the peak power handling by battery during RB can be eliminated. The harvested energy from the RBS serves the real-time peak power demands during accelerations, Up-hills and starting transients of the electric motor. Thus, the battery is avoided from the stress and repeated charges during regenerative braking, which results in improving the battery life span. Since the braking energy could be completely utilized, the driving range of the electric vehicle can be increased considerably and also overcomes the limitation of RBS.