photovoltaic recharging station for electrical vehicles

international meeting, October 2009

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Photovoltaic recharging station for electrical vehicles


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Study and realization in the Electrical Engineering Department at I.U.T Béthune .

� a new teaching module in renewable energies

=> it consists in students’ projects in a laboratory.

� teaching development with practical projects

=> to increase the student’s autonomy

to motivate the student’s interest.

� it is composed of a group of students from differen t nationalities who worked together on a technical pr oject.

� it takes part in an international collaboration in renewable energies.


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The international collaborationTo organize common students’ projects in various cou ntries

International Collaboration in Engineering Educ ationI.C.E.Ecountries involved

Béthune, Fr Altoona, USA Budapest, HuDublin, Ir Warsaw, Po Cluj Napoca, RoMarrakech, Mo Zaragoza, Sp Baia Mare, Ro

The subject is Electrical systems to manage renewable energies.

The web site: www.univ-artois.fr/icee


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The technical applications

The project conducted at I.U.T Bethune


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The recharging station

charge

regulator

transfer converter

power part

control part

photovoltaic panels

station batteries24V 200Ah

electrical vehicle being recharged

48V 55Ah


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The overall project

µC

solar panels

Zig bee

autonomous recharging station

energystorage

chargeconverter

chargeregulator

supervision base

Zig bee

PC

web pages

Zig beeµC

electrical vehicle

energystorage


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Station scheme

stationbatteries

solarpanels

chargeregulator

electrical vehicle batteries

TXPIC

istiev

vst vev

D

Q

microcontroller

Boostchopper

filter

L isto

C

vQ

zigbee

48 panels Vst = 24V f = 15 kHz L = 11 µH Vev = 48 VFEE 14-12 200 Ah IGBT 50A 1200V C = 1000 µF 55 Ah12V 12W control through a µC PIC 16F877


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Functioning of the converter

Q

Dist isto

vst vevVQ

L

First state: the transistor is conducting from t = 0 till α.T


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Second state: at t = α.T , the control part opens the transistor till T

Q

Dist isto

vst vevVQ

L

Functioning of the converter


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The experimental converter

input24V

coilpack IGBT + diode

control part with PIC µC

current sensor

voltage sensor

output 48V


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The tests

control signal of the IGBT

10V/div

input current ist

10A/div

T = 66 µsf = 1/T = 15 kHz

α.T


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diode current isto10A/div

The tests


10V/div


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output current i ev

10A/div

average value of the output current = 8A

0

The tests


10V/div


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duty cycle

α

efficiency

η

input output

The tests


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Implementation of the wireless communicationImplementation of the wireless communication�Communication between the vehicle, the recharging s tation and the supervision base.

�We use ZigBee modules to transmit numerical data thr ough WiFi network. (standard IEEE 802.15.4, 2.4 GHz, 20-250 Kb/s, 100- 1600 m).

�We use microcontroller to measure the parameters (v oltages, curr ents...) analog to digital conversion and then transmission through a serial link to the ZigBee module.

�Web pages with graphical presentation (Java Applets ). Drawing of the different measures, and control of the functioning of the recharging station.


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Example of distant measuresExample of distant measures� Real time drawing of the vehicle parameters.

� An emitter on the vehicle, a receiver connected to a computer.

� The data are received through Matlab for later calcu lations.

the motor current

the speed of the vehicle

the ZigBee module on the vehicle


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The group of students and their tutors

Tomazs KlodaVarsovie, Po

Dan DragosResita, Ro

Fatima DladouMohammedia, Mo

Hamza MajbarMohammedia, Mo

François MaeghtPatrick Favier

Pierre Yves Cresson


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in conclusionThe innovations are two fold

�� from the technical point of view:

This solution allows using photovoltaic energy to ch arge an electrical vehicle from a large field of solar panels.

The slow charge or the fast charge are made possible o n this system because of the high capacity batteries compos ing the recharging station.

This system is autonomous and interactive.

This application contributes to environmental sustain ability

This project is a prototype as a starting test.

⇒ It means opportunity for

technology transfer University �� Companies


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�� From the educational point of view:

This allowed implementing meetings, studies, … in t he same place for foreign students originating from different countries an d from different educational systems.

The topic of renewable energies is most attractive fo r the students

=> It defines a new modern aspect for the Electrical Engineering.

This application concerns a lot of subjects in Elect rical Engineering

This group of working people has been integrated into an international collaboration.

in conclusion

photovoltaic recharging station for electrical vehicles

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