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Hybrid Energy Management System For Electric Vehicles
Sharf, Hazem Magdi
Sharf, Hazem Magdi
Description
A Master of Science thesis in Electrical Engineering by Hazem Magdi Sharf entitled, “Hybrid Energy Management System For Electric Vehicles”, submitted in December 2021. Thesis advisor is Dr. Mohamed Hassan and thesis co-advisor is Dr. Ahmed Osman. Soft copy is available (Thesis, Completion Certificate, Approval Signatures, and AUS Archives Consent Form).
Abstract
Boosting the performance of the energy storage system (ESS) of electric vehicles (EV) is of great significance to achieve their pervasion and encourage their mass adoption, which will, in turn, curtail the emission of greenhouse gases and promote a cleaner environment. The objective of this work is to develop and evaluate the capabilities of an EV hybrid energy storage system (HESS) that consists of a main source, namely the Lithium-ion (Li-ion) battery, and an auxiliary source, namely the supercapacitor (SC), to provide more efficient EV energy management. The integration of supercapacitors in EV energy storage systems (ESS) is expected to greatly enhance their performance by addressing high current requirements and extending the EV battery lifetime. Accordingly, this thesis proposes a strategy for managing the energy flow between the integrated battery-supercapacitor HESS and the EV motor to efficiently meet the energy requirements of the EV driving experience. Several simulations are implemented using MATLAB/Simulink to track the current output of each energy source, i.e. the Li-ion battery and the supercapacitor, and their corresponding state-of-charge (SoC). The performance and aging of the HESS operating with the proposed energy management strategy are then evaluated and compared to the performance of traditional ESS without supercapacitors by calculating different stress parameters and aging factors. Additionally, a scaled-down experimental model is developed and tested to validate the simulation results. Performance evaluation of the proposed HESS based on results of the conducted simulations and experiments reveal that the life expectancy of the battery banks is improved by an average of four times, which proves the employment of the SC bank to be cost-effective. Additionally, the remaining energy stored in the EV battery at the end of the driving cycle is higher when the SC bank is used, resulting in increased driving range.