The simulation of a series HEV (hybrid electric vehicle) is suggested by using the Energetic Macroscopic Representation (EMR). Simplified models are used in a first step. They lead to the simulation of an overall HEV with its control. The system is decomposed in two parts: the charge and traction subsystems. Simulations with Matlab-SimulinkTM are provided for the simplified system. These first simulations can now be improved by using more complex models of some devices. Indeed, the EMR organizes systems as interconnected components, that leads to modularity and flexibility.