Abstract
This study presents a bi-directional multi-level power
electronic interface for the grid interactions of plug-in hybrid
electric vehicles (PHEVs) as well as a novel bi-directional power
electronic converter for the combined operation of battery/ultracapacitor
hybrid energy storage systems (ESS). The grid
interface converter enables beneficial vehicle-to-grid (V2G)
interactions in a high power quality and grid friendly manner;
i.e, the grid interface converter ensures that all power delivered
to/from grid has unity power factor and almost zero current
harmonics. The power electronic converter that provides the
combined operation of battery/ultra-capacitor system reduces the
size and cost of the conventional ESS hybridization topologies
while reducing the stress on the battery, prolonging the battery
lifetime, and increasing the overall vehicle performance and
efficiency. The combination of hybrid ESS is provided through
an integrated magnetic structure that reduces the size and cost of
the inductors of the ESS converters. Simulation and experimental
results are included as prove of the concept presenting the
different operation modes of the proposed converters.
