The document discusses wind energy conversion systems that use doubly fed induction generators (DFIGs). It first provides a basic block diagram of a wind energy conversion system, including an aerodynamic turbine to extract wind energy, a gearbox to convert the rotational speed, and a generator to produce electrical energy. It then discusses DFIGs in more detail, including different control strategies like direct and indirect control methods. The document also provides the equivalent circuit diagram of a DFIG and discusses some of the advantages and disadvantages of different types of wind generators.

1. GLOBAL WIND POWER COMMULATIVE CAPACITY

2. BLOCK DIAGRAM OF BASIC WIND
ENERGY CONVERSION SYSTEM.
• Aerodynamic turbine model :To extract the wind energy and convert the
kinetic energy of the wind to mechanical energy.
• Gear box : Converts a slowly rotating ,high torque power received from wind
turbine rotor to high speed, low torque power generator.
• Generator: To get the required electrical energy.

3. S/
NO
TITLE AUTHOR
PUBLICATION
YEAR
REMARKS
1 Design of Fuzzy
Logic Control for
Direct and
Quadratic
Components of
DFIG’s Rotor and
Grid
Side Control System
Based Wind
Turbines.
Abdelh
Ramadan
, Ahmed
Rashad
Twentieth
International
Middle East
Power
Systems
Conference
(MEPCON),
2018
This paper comprises of
response of a 9MW DFIG
wind farm using fuzzy
logic controller for two
types of fault :voltage sag
on three phase voltage
source and three phase
fault.
2. Fuzzy Rotor Side
Control of a DFIG-
Based Wind
Turbine.
Moham
med
Elkacem
Djeridan,
Riadh
Ajgou.
International
Conference
on
Communicati
ons and
Electrical
Engineering
(ICCEE),2018.
In this paper, a manually
tuned fuzzy logic controller
using sugeno model is
presented to have a stable,
fast and optimum control
over active and reactive
power output of generator
.Also, MPPT algorithm is
used to maximize power
extraction.

4. S/
NO
TITLE AUTHOR
PUBLICATION
YEAR
REMARKS
3 Control Strategies
for DFIG based on
Wind Energy
Conversion System
using RST and Fuzzy
Logic
Controllers.
Bouchaib
Rached,
Mustaph
a
Elharous
si.
International
Conference of
Computer
Science and
Renewable
Energies
(ICCSRE),2019
This work compares the
energy production unit
performance of WECS
based DFIG connected to
electric power grid by use
of RST and fuzzy logic
controller.
4 DFIG wind turbine
grid connected for
frequency and
amplitude control
in a smart grid.
Jose
Antonio
Cortajare
na, Julian
IEEE
International
Conference
on Industrial
Electronics for
Sustainable
Energy
Systems
(IESES),2018
In this paper, droop control
technique is used to
regulate grid amplitude
and frequency.

5. S/
NO
TITLE AUTHOR
PUBLICATION
YEAR
REMARKS
5 Power control
improvement of
doubly fed
induction
generator based on
wind energy
conversion system.
Kaoutar
RABYI,
Hassane
MAHMO
UDI
3rd
International
Conference
on Electrical
and
Information
Technologies
(ICEIT),2017
This paper proposes the
fuel cell and solar cell
integration with the aid of
MATLAB software, the
harmonics produced by the
load is eliminated and
reactive power
compensation is achieved
by the use of hybrid filter
6 Protection of DFIG
wind turbine using
fuzzy logic
control.
Mohame
d M.
Ismail,
Ahmed F.
Bendary.
ELSEVIER,
2016
In this paper the approach
manifest that the
combined system of active
and passive filter proves to
be more beneficial for the
compensation of
harmonics.

6. S/
NO
TITLE AUTHOR
PUBLICATION
YEAR
REMARKS
7 Doubly Fed
Induction
Generator for Wind
Energy Conversion
Systems with
Integrated Active
Filter Capabilities .
N K
Swami
Naidu,
Student
Member,
IEEE, and
Bhim
Singh,
Fellow,
IEEE
IEEE
Transactions
on Industrial
Informatics,
2015
In this paper, GSC is
controlled for supplying
harmonics in addition to
slip power transfer and
RSC is used to attain
maximum power extraction
and to supply required
reactive power to DFIG.
8 Modeling of DFIG
for the Variable
Speed Wind
Turbine
M.Kowsa
lya,
Sumanth
Srinivas
Gaurav
International
Conference
on Control,
Instrumentati
on,
Communicati
on and
Computationa
l
Technologies,
2014
This paper displays the
elements for
demonstrating
variable speed wind
turbine utilizing MATLAB/
Simulink for a 2MW DFIG.

7. S/
NO
TITLE AUTHOR
PUBLICATION
YEAR
REMARKS
9 Impact of DFIG
based Wind Energy
Conversion
System on Fault
Studies and Power
Swings.
Likin
Simon, K
Shanti
Swarup
National
Power
Systems
Conference
(NPSC) ,2016
This paper analyses the
short circuit characteristics
of DFIG for the three phase
fault current and Case
studies are performed to
analyze the impact of
location of fault to the
power swing and fault
current
contribution.
10 Comparison of
PMSG and DFIG
for Marine Current
Turbine
Applications
S.
Benelgha
li, M.E.H.
Benbouzi
d
International
Conference
on Electrical
Machines,
2010
A comparative study of
PMSG AND DFIG is fully
analyzed in terms of
generated power,
maintenance and
operation constraints

8. S/
NO
TITLE AUTHOR
PUBLICATION
YEAR
REMARKS
11 A REVIEW OF
POWER
CONVERTER
TOPOLOGIES FOR
WIND
GENERATORS
J. A.
Baroudi,
V.
Dinavahi
ELSEVIER,
2005.
This paper provides review
of converter topologies
applicable to permanent
magnet generators,
induction generators,
synchronous generators
and doubly fed induction
generators and are
compared on the basis of
topology, cost , efficiency,
power consumption and
control complexity.
12 Real-Time Control
of Active and
Reactive Power for
Doubly Fed
Induction
Generator (DFIG)-
Based Wind Energy
Conversion System
Aman
Abdulla
Tanvir,
Rachid
Beguena
ne.
Energies
journal, 2015
This paper presents
modeling of DIFG in d-q
reference frame using a
field oriented control is
applied for active and
reactive power and dc link
voltage at the grid side.

9. DIFFERENT TYPES OF WIND ENERGY
GENERATORS.
(FLOW CHART).

10. DC Generator Based WECS.
DISADVANTAGE:
•Sparking at Brushes and commutator.
•Requires more maintenance.

11. SYNCHRONOUS GENRATOR .
• ELECTRICALLY EXCITED SYNCHRONOUS
GENERATOR(EESG):
• DC current excitation to rotor requires
Brushes and slip rings on the generator shaft.
• Cleaning of carbon Dust.

12. PMSG BASED WECS:
Advantages:
•Requires Brushless DC excitation.
•Reduced air gap between the stator and rotor ,thus increasing effciency.
Disadvantage:
•No control of rotor flux.
•Use of gear box produces noise, increases power loss, requires regular maintenance
increases overall weight of the system.
•Requires 2 rectifier and 1 inverter, thus increasing the cost.
•Cost of permanent magnet for large machines is very high .So ,used for small wind
turbine generators.
Fig: permanent magnet based wind energy conversion system

13. DFIG BASED WECS.

14. CONTROL STRATEGY IN DFIG
DIRECT CONTROL METHOD:
• Involves direct control of active and reactive power.
• Active power is directly proportional to q-axis rotor current as
• Reactive power is directly proportional to d-axis component as
s ds
Q V I

s qs
P V I

s qs
P V I


15. INDIRECT CONTROL METHOD:
• Involves 2 loops for power control.
• Contains 2 PI Controller

16. EQUIVALENT CIRCUIT DIAGRAM OF DFIG:
The voltage equations can be written as :
s
s s s e s
d
V R i j
dt

 
  
( ) r
r r r e r s
d
V R i j
dt

  
   