On configuration and control strategy for EV hybrid energy storage systems

To reduce impacts of the high rate current charge and discharge induced by frequent acceleration and deceleration of the vehicles to the battery in view of pure electric vehicles (EV), a hardware configuration, control algorithm design and an experiment study on battery+supercapacitor hybrid energy storage systems are addressed. At first, a topology structure with respect of the hybrid energy storage systems is introduced. Then, a key component of DC/DC converter is modeled, and its efficiency behavior is evaluation through experiment. A primary hard-ware configuration of the hybrid energy storage systems is completed, and a power splitting ratio (PSR) control algorithm is proposed. Hard-ware in loop experiments confirm that the supercapacitor has a function to smooth the power supplied by the battery and therefore the life time of the battery can be prolonged and improves EV´s performance.