In order to investigate the impact of Plug-in Electric
Vehicles (PEVs) in distribution network studies, realistic
modeling of PEVs load demand is important. One of the most
important characteristics of the PEVs is the nonlinear behavior
of their batteries in charging periods that should be considered in
PEVs demand modeling. An accurate stochastic modeling of
PEVs load demand proposed in this paper. The charging
characteristic of batteries has been considered in linear and
nonlinear charge profiles, separately, and the results of them are
compared with each other as well. The results show that the
nonlinear modeling of batteries has a significant effect on the
load of the fleet, and it should be considered in relevant studies.