The nonlinear dynamic model of the complete electromechanical system of an electric vehicle is developed, in a manner that enables a rigorous stability analysis of the entire system. In particular, the model developed, includes in detail, the battery storage system, the electric machine, the power converters, used to interface the battery as well as the electric motor, and finally the dc loads. On this model, Lyapunov based nonlinear techniques are applied to prove input-to-state stability (ISS) of the system with respect to arbitrary external inputs, namely the external mechanical torque on the car wheels and the internal battery voltage. As proven in the paper, ISS holds true for any feasible bounded duty-ratio signals and as it is shown by the simulation results, this ensures a very satisfactory system performance without contradictions and adverse impacts between the several responses of the electric or electromechanical part.
['Antonio T. Alexandridis', 'Jemma J. Makrygiorgou']
Nonlinear dynamic modeling and stability analysis of electric vehicles