On the Implementation of a

Microgrid Project with Renewable

Distributed Generation

Vicente Leite

Polytechnic Institute of Bragança

Outline

• Motivation

• The IPB microgrid project:

– Conceptual Design

– Integrated systems

– Systems to be integrated

• On-going project for V2G and G2V integration:

– Power structure and control

– Simulation results

• Conclusions

Motivation

This small microgrid has been developed as a research platform

and also for demonstration purposes as part of a wider project

named VERCampus – Live Campus of Renewable Energies –

which integrates a set of technologies, infrastructures, and

initiatives carried out in the Campus of the Polytechnic Institute

of Bragança, regarding the renewable energies technologies and

distributed power generation systems promotion and

dissemination for students, stakeholders and all community in

general.

The IPB microgrid: Conceptual Design

Photovoltaic systems

3 kW solar tracker (integrated with the laboratory)

Sensors (T, R, W)

and webbox for

remote monitoring

2 kW PV panel for microgrid / solar chargers (with

terminals available for different PV configurations)

9 PV modules FTS-220P with total power 2 kW,

VOC

=330,84V and ISC

=8,30A (at STC).

Passaat WT from Fortis (1,4 kW)

Small Wind Turbine

Energy storage components

Semi-automatic production

unit of biodiesel from used

cooking oil

5 kW Electric

generator

Bank of batteries

8×6V, 200A

ECO Buggy IPB

Motor:

Permanent Magnet;

13 kW; 64,87 V;

149,5 A; 6000 rpm;

20,7 Nm; 8 poles; 400 Hz.

Battery:

Lithium iron phosphate;

96 V, 70 Ah, 90 Kg.

Electric Vehicle

29 glass × 24 PV cells = 29 × 46 W = 1334 W

Glass facade of the library of the School

of Technology and Management

Photovoltaic glass facade

Power house Discharge basin

� Stand-Alone System (1 kW)

� Grid-Connected System (1 kW)

Two propeller turbines:

Irrigation canal Small intake weir End of canal

Discharge divisor

and spillway

Feeder

canals

Turbines

Pico hydro power plant

On-going project forV2G and G2V integration

Bi-directional converter topology

+

*

dcV

*

sI

*

si*

bI

*bV

+

Control of the DC/DC converter

*bI

*bV

Cu

rre

nt

(A)

Voltage (V)

Control of the Voltage Source Inverter

*

dcV

*

sI

*

si

Simulation Results

Simulation Results

0 0.5 1 1.5 2 2.5 3 3.5 4

-20

-10

0

10

Time (s)

Bat

tery

cur

rent

(a)

0 0.5 1 1.5 2 2.5 3 3.5 499

99.5

100

100.5

101

Time (s)

Bat

tery

vol

tage

(V

)

IbIb-ref

G2V V2G

Simulation Results

0 0.5 1 1.5 2 2.5 3 3.5 4100

150

200

250

300

350

400

450

500

Time (s)

DC

Lin

k V

olta

ge (

V)

VdcVdc-ref

G2V V2G

1.8 1.85 1.9 1.95 2 2.05 2.1 2.15 2.2 2.25 2.3-400

-200

0

200

400

Time (s)

Gri

d vo

ltage

(V

)

VsVpll

1.8 1.85 1.9 1.95 2 2.05 2.1 2.15 2.2 2.25 2.3-20

-10

0

10

20

Time (s)

Gri

d cu

rren

t (A

)

IsIs-ref

Simulation Results

G2V V2G

Conclusions

• The IPB microgrid project is a laboratory development platform for

microgrids with renewable distributed generation and energy storage

elements;

• It is suitable for isolated (or not) and self-sustainable systems up to a rated

power of 5 kW (but can be expanded up to hundreds of kW);

• It has been developed as a research platform and also for demonstration

purposes, and is part of a wider project related to renewable energies

(vercampus.ipb.pt);

• In this context, a V2G and G2V project is being developed, which will

provide a second energy storage element using the battery of an electric

vehicle.

Thank you very much

Vicente LeitePolytechnic Institute of Bragança

School of Technology and Management

Campus de Santa Apolónia, Apartado 1134

5301-857 Bragança, Portugal

avtl@ipb.ptt