Supercapacitor control for electric vehicle powered by hybrid energy storage system

Abstract

In this dissertation, a proposed rule-based EMS was modelled in MATLAB Simulink using the EV reference model. The implementation and design of the proposed EMS was guided by knowledge gained throughout the study. Unlike in previous studies where the SC was used only as a peak power shaving solution, in the proposed EMS the SC is used throughout the operation of the EV. The simulation results of the proposed EMS showed that for city driving conditions, the battery current was reduced by 19% when compared to a battery only ESS of the same size. For traffic conditions, the battery current was reduced to 0 A while with highway driving the battery current was reduced by 50% when compared to a battery only ESS of the same size. Furthermore, the proposed EMS ensured that the battery current is only in one direction, discharge only. These factors ensure the longevity of the battery.