Fearghal Kineavy 4 th Energy Systems Engineering – Electrical Stream Department of Electrical and Electronic Engineering, NUIG Supervisor: Dr Maeve Duffy Co-Supervisor: Dr Edward Jones

MPPT DC/DC Converter DC/AC Inverter to grid Onboard AC/DC Rectifier and charger DC Charging Unit OR

 Best selling electric car in Ireland in 2011  80kW AC Motor  Max speed of more than 140km/h  Max range approx. 175km  24kWh Li-ion battery  48 modules connected in series

 Home charge point (AC) ◦ Single phase 16A (3.6kW) supply ◦ 6-8 hours to charge  Public charge point (AC) ◦ 3 phase supply ◦ 2-3 hours to charge  Fast charge points (DC) ◦ 400V DC, 120A (50kW) supply ◦ minutes charges EV to approx. 80% charge

CHAdeMO Connector (DC current) Mennekes Type 2 Connector (AC current)

 Extensive research done into: ◦ Nissan leaf battery and other li-ion batteries ◦ PV panels ◦ DC/DC converters ◦ Maximum Power Point Tracking (MPPT)  Begun designing small scale charging system to prove concept ◦ PV panel, li-ion cell and charger chosen ◦ Buck converter will be used, inductor and capacitor values to be chosen ◦ MPPT will be implemented using PWM from an arduino to control the duty cycle (Perturb and Observe MPPT)

 Test Spectra 10W PV panel to determine I-V and P-V curves  Choose suitable current sensor  Test charge li-ion cell with DC source to determine charging profile  Create SPICE simulation circuit to help choose appropriate values for the buck converter components

 Design and do detailed simulation of full size system using SPICE ◦ Scale up demonstration SPICE model ◦ Will most likely have to change model to a boost converter for full size system ◦ Alter component values accordingly ◦ Analyse the system at various operating conditions (full load, half load etc.)  Compare full size DC charging system with alternative DC- AC-DC system (better efficiency?)  Compile results and write final report