MPPT DC/DC Converter Design for Photovoltaic Powered Electric Vehicle Charging System

Fearghal Kineavy4th 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◦ 20-25 minutes charges EV to approx. 80% charge

CHAdeMO Connector(DC current)

Mennekes Type 2Connector (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