Fuzzy Controller for a Battery and Ultracapacitor Hybrid Energy Storage System Vehicle

Resumo

With the increase in transportation electrification, one of the biggest challenges is to improve battery
performance and autonomy. A battery normally has a high energy density with a low power density, while an
ultracapacitor has a high power density but a low energy density. Therefore, this paper has proposed associating
more than one storage technology generating a Hybrid Energy Storage System (HESS), which has a battery and
ultracapacitor, whose objective is to improve the electric vehicle (EV) driving range. When batteries and SC
are associated, the power management complexity increases considerably. In this work, a fuzzy logic power
management control for the HESS is developed for the best use of the regenerative energy released for charging
the capacitors and minimizing battery wear in urban driving cycles. Therefore, it is necessary to determine the
correct power distribution between the storage devices to enhance the system efficiency by saving the battery from
excessive efforts. The topology used considers bidirectional converters, coupled to the bus and connected to the
electric motors which propel the EV. For the simulations, Matlab and Simulink software is used, where it is possible
to analyze the dynamic behavior of the electric vehicle.