Reconfigurable multiport solid-state transformer for DC fast charging stations

This thesis presents a Solid-State Transformer (SST)-based Electric Vehicle (EV) fast charging station that enhances reliability and optimizes power distribution. Traditional SST-based stations rely on a shared DC bus, susceptible to faults that disrupt the entire system. The proposed system introduces multiple independent DC buses, isolating faults and improving reliability while eliminating the need for additional DC-DC converters, reducing costs and space. Reconfigurable ports deliver 800V, 400V, and 200V, accommodating heavy, medium, and light EVs. A dynamic reconfiguration algorithm adjusts the ports based on vehicle requirements. MATLAB/Simulink simulations confirm stable charging currents and voltages under varying loads. A scaled-down prototype achieves an efficiency of 93.75%, with experimental results showing light EVs charged at 1.25A/50V and heavy EVs at 2.5A/100V, with an 8.2% voltage ripple. Grid current THD remains below 5%, meeting IEEE 519-2022 standards. The system enhances EV fast charging stations' reliability, efficiency, and cost-effectiveness.

Name thesis:degree_name

Master of Applied Science (MASc)

Discipline thesis:degree_discipline

Electrical and Computer Engineering

Grantor

University of Ontario Institute of Technology

Year dc:date.issued

2025

Author dc:creator

• Edirisooriya Mohottige, Ruvini Wathsala De Seram

Advisor dc:contributor.advisor

• Williamson, Sheldon

Language dc:language.iso

en

Handle dc:identifier.uri

https://hdl.handle.net/10155/1916

OAI identifier oai:identifier

oai:ontariotechu.scholaris.ca:10155/1916