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Regenerative Energy Characteristics of Battery and Supercapacitor in a PEMFC Hybrid System

  • Kim, Byeong Heon (Department of Special Equipment, Chunnam Techno University) ;
  • Wei, Qingsheng (Department of Mechanical Engineering, Chonnam National University) ;
  • Oh, Byeong Soo (Department of Mechanical Engineering, Chonnam National University)
  • Received : 2017.01.31
  • Accepted : 2017.03.30
  • Published : 2017.08.31

Abstract

This study focuses on the application of the PEM Fuel Cell(PEMFC) hybrid system, which includes a regenerative braking system with supercapacitor(SC) and battery. The purpose of this study is to evaluate the characteristics of regenerative energy and to propose solutions to increase regenerative energy via vehicle simulation. To achieve this target, we set the rated motor speed to 3,000/2,500/2,000 rpm. Because the flywheel is directly connected to the motor, the generator activates regenerative braking by using the rotational momentum of the flywheel when the flywheel reaches the set speed after the motor stops. We could then measure the characteristics of regenerative braking of voltage, current, power, energy change, etc. Meanwhile, we calculate the storage efficiency of the SC or the battery. Our results show that the SC stores 18% of the regenerative energy, while battery stores 15% of the energy. Since the regenerative energy decreases with the decrease of the motor rotating speed that 5,027 J and 2,915 J are restored at 3,000 and 2,500 rpm, respectively. The experimental results also prove that regenerative braking energy is able to be obtained if and only if the speed of flywheel is over 2,500 PRM, and the efficiency of the system can be further improved.

Keywords

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