Design of an Improved Hybrid Lithium-Ion-Ultracapacitor Energy Storage System for Transport Vehicles.
Mayingi, Buasa
Mayingi, Buasa
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Abstract
Lithium-ion Battery (LIB) are seen as viable solution to replace the current Lead-Acid Battery (LAB). It is due to the potential of obtaining higher power and energy density, as well longer
lifespan compared with LAB. In order to balance the efficiency in terms of long lifespan, high energy and power density; there is need to hybridize with an Energy Storage System (ESS).
Therefore, this research study seeks to design a hybrid Lithium-Ion-Ultracapacitor energy storage system (ESS) that will have a high storage capacity and longer lifespan at a reduced weight compared to a single LAB ESS. The proposed research study employs MATLAB/Simulink software to model and validate its findings. Three different scenarios are considered, namely Case-1 (12V-40Ah), Case-2 (12V-70Ah), and Case-3 (12V-90Ah), and the results are compared with manufacturers' data for lead-acid batteries (LABs) of corresponding ratings, focusing on storage capacity and lifespan. The converters have ensure the voltage stays above the set nominal value 12 V and that the battery State-of-Charge (SOC) is kept above 98% during cold cranking mode. Ultracapacitors(UCs) play a crucial role on hybrid energy storage systems (HESSs) due to the capacity of supplying high power density in very short time. As a result, this enhances the lifespan of the LIB significantly. The analysis shows that the lifespan of the LIBs is increased by 2.85-year, 3.41 years and 3.42 years respectively for Case-1, Case-2 and Case-3. These enhancements are achieved without altering the chemical composition of the lithium-ion batteries. The study underscores the potential for the automotive industry to gain significant benefits, including a minimum three year extension of battery lifespan, by implementing HESS technology.
Description
Submitted in partial fulfilment of the requirements for the Degree in Engineering (MEng): Electrical Engineering Field of Specialization: Power Engineering In the Department of Electrical Engineering, Faculty of Engineering and the Built Environment, Tshwane University of Technology
Date
2023-10-01
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Tshwane University of Technology
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Keywords
Hybrid Lithium-Ion-Ultracapacitor, Energy Storage System, Transport Vehicles