TITLE:
Analysis of Hybrid Rechargeable Energy Storage Systems in Series Plug-In Hybrid Electric Vehicles Based on Simulations
AUTHORS:
Karel Fleurbaey, Noshin Omar, Mohamed El Baghdadi, Jean-Marc Timmermans, Joeri Van Mierlo
KEYWORDS:
Plug-In Hybrid Electric Vehicle, Hybrid Energy Storage System, High Energy Battery, High Power Battery, Electrical Double-Layer Capacitor, Lithium-Ion Capacitor
JOURNAL NAME:
Energy and Power Engineering,
Vol.6 No.8,
August
22,
2014
ABSTRACT: In
this paper, an extended analysis of the performance of different hybrid
Rechargeable Energy Storage Systems (RESS) for use in Plug-in Hybrid Electric
Vehicle (PHEV) with a series drivetrain topology is analyzed, based on
simulations with three different driving cycles. The investigated hybrid energy
storage topologies are an energy optimized lithium-ion battery (HE) in
combination with an Electrical Double-Layer Capacitor (EDLC) system, in
combination with a power optimized lithium-ion battery (HP) system or in
combination with a Lithium-ion Capacitor (LiCap) system, that act as a Peak
Power System. From the simulation results it was observed that hybridization of
the HE lithium-ion based energy storage system resulted from the three
topologies in an increased overall energy efficiency of the RESS, in an
extended all electric range of the PHEV and in a reduced average current
through the HE battery. The lowest consumption during the three driving cycles
was obtained for the HE-LiCap topology, where fuel savings of respectively 6.0%,
10.3% and 6.8% compared with the battery stand-alone system were achieved. The
largest extension of the range was achieved for the HE-HP configuration (17%
based on FTP-75 driving cycle). HP batteries however have a large internal
resistance in comparison to EDLC and LiCap systems, which resulted in a reduced
overall energy efficiency of the hybrid RESS. Additionally, it was observed
that the HP and LiCap systems both offer significant benefits for the
integration of a peak power system in the drivetrain of a Plug-in Hybrid
Electric Vehicle due to their low volume and weight in comparison to that of
the EDLC system.