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International Journal of Electrical and Computer Engineering (IJECE)
Vol. 10, No. 1, February 2020, pp. 35~46
ISSN: 2088-8708, DOI: 10.11591/ijece.v10i1.pp35-46  35
Journal homepage: http://ijece.iaescore.com/index.php/IJECE
Enhancement of the direct power control applied to
DFIG-WECS
Hala Alami Aroussi1
, ElMostafa Ziani2
, Manale Bouderbala3
, Badre Bossoufi4
1,2
Laboratory of Electrical and Maintenance Engineering (LGEM), Mohamed Premier University, Oujda, Morocco
3,4
LISTA Laboratory, Faculty of Sciences Dhar El Mahraz, Sidi Mohammed Ben Abdellah University, Fez, Morocco
Article Info ABSTRACT
Article history:
Received Oct 29, 2018
Revised Jul 20, 2019
Accepted Aug 29, 2019
This work is dedicated to the study of an improved direct control of powers
of the doubly fed induction generator (DFIG) incorporated in a wind energy
conversion system 'WECS'. The control method adopts direct power control
'DPC' because of its various advantages like the ease of implementation
which allows decoupled regulation for active and reactive powers, as well as
a good performance at transient and steady state without PI regulators and
rotating coordinate transformations. To do this, the modeling of the turbine
and generator is performed. Therefore, the Maximum Power Point Tracking
(MPPT) technology is implemented to extract optimal power at variable
wind speed conditions. Subsequently, an explanation of the said command is
spread out as well as the principle of adjusting the active and reactive power
according to the desired speed. Then, the estimation method of these two
control variables will be presented as well as the adopted switching table of
the hysteresis controller model used based on the model of the multilevel
inverters. Finally, the robustness of the developed system will be analyzed
with validation in Matlab/Simulink environment to illustrate the performance
of this command.
Keywords:
DFIG
DPC
Hysteresis controllers
MPPT
WECS
Copyright © 2020 Institute of Advanced Engineering and Science.
All rights reserved.
Corresponding Author:
Hala Alami Aroussi,
Laboratory of Electrical and Maintenance Engineering (LGEM),
Ecole Supérieur de Technologie, Mohamed Premier University,
BP 473 Complexe universitaire Al Qods, Oujda 60000 Oujda, Morocco.
Email : h.alamiarroussi@ump.ac.ma, alami.aroussi.hala@gmail.com
1. INTRODUCTION
The production of electrical energy in the world generates various pollutions. Thus, thermal power
stations (coal, oil) are responsible for atmospheric emissions linked to the combustion of fossil fuels.
In contrast, nuclear power plants, whose development will increase following the oil crisis, have no
adverse influence on air quality although they produce radioactive waste that causes storage problems,
treatment or transport.
Today, the fear of being limited to ephemeral energies, the awareness of the negative impact of
these on the environment, the craze for renewable energies and the opening of the market of the production
of energy towards other alternatives are factors that give an important place to these energies (hydraulic,
wind, solar, biomass, ...) in the production of electricity [1-3].
Among the most coveted renewable energies, we find the wind energy that interests more and more
countries as it produces a clean and sustainable energy. We also notice that a large part of wind turbines
installed today is equipped with a doubly fed induction generator (DFIG). The latter allows the production of
electricity under variable speed, this makes it possible to better exploit turbine resources. These turbines are
also equipped with variable blade pitch angle in order to be adapted to different wind conditions.
The turbine is controlled so as to permanently maximize the power produced independently of the variation
of the wind profile [4].
Int J E
36
a DFI
is to
contro
the DP
and si
2. T
a theo
the fo
the sp
of the
Nume
expre
a func
With
and :
the co
passes
design

Elec & Comp
The main
IG in a wind e
ensure the sa
ol of the activ
In this pe
PC control law
imulation resu
TURBINE M
A theoreti
oretical power
P
The aerod
ollowing formu
P .
The powe
peed ratio	λ	an
e blades and th
λ
erical approxi
ssions have be
In the con
ction of the sp
C λ, β
: c1= 0.587
.
Figure 2
oefficient C
s through a m
nate by λ (w
Eng, Vol. 10,
objective of t
energy conver
ampling of sin
e and reactive
erspective, a
w [5-7]. The w
ults are expose
Figure 1. S
MODEL
ically undistu
r of the wind o
	. ρ. A. v 	
dynamic pow
ula:
. ρ. A. C λ, β
er coefficient	C
nd the pitch an
he wind speed
imations have
een proposed
ntext of this
peed	λ	and the
	c 	c .
2, c2= 116, c3
.
.
shows the
as a function
maximum (C _
where	λ
, No. 1, Febru
this work is to
rsion system (
nusoidal curre
e powers.
complete mo
whole of the s
ed and analyze
Synopsis of the
urbed wind cr
or wind power
wer appearing
. v
C λ, β repre
ngle of the bla
d:
e been develo
[4, 8].
work, we wil
angle	β	as fol
	c . β 	c .
3 = 0.4, c4= 5
simulation
of the speed
_ 0.48) f
8).
uary 2020 : 35
o study the dir
(WECS) as sh
ents while gu
odeling of the
system is imp
ed in order to
e direct power
rossing a surf
r correspondin
g at the roto
esents the aero
ade	β. The spe
oped in the lit
ll use an app
llows:
e 	
	c . λ
, c5 = 21, c6=
results unde
d ratio λ	for a
for β 0 and
5 - 46
rect power co
hown in Figure
uaranteeing a
e architecture
plemented und
prove the effi
r control of th
face A withou
ng to the follo
or of the turb
odynamic effi
eed ratio is de
terature to mo
proximate exp
λ
= 0.0085.
er MATLAB/
few pitch an
d a particular
ontrol (active a
e 1. The comm
unit power fa
e is proposed
der the Matlab
iciency of the
e DFIG-WEC
ut a decrease
wing expressi
bine is deter
iciency of the
efined as the r
odel the coeff
pression of th
/SIMULINK
gles	β. We no
value of the s
ISSN: 2
and reactive)
mon goal of th
factor with a
d in order to
b/Simulink en
control.
CS
in speed v w
ion:
(
rmined analy
(
e turbine. It d
ratio of the lin
(
ficient C and
he power coef
(
of the evo
ote that this c
speed ratio th
2088-8708
applied to
his control
decoupled
elaborate
vironment
would give
(1)
tically by
(2)
epends on
near speed
(3)
d different
fficient as
(4)
olution of
coefficient
at we will
Int J E
3. M
by ex
the m
Power
It is p
the co
adapts
Such
the wi
TSR
contro
to ma
4. D
summ
4.1. E
4.2. F
Elec & Comp
MAXIMUM
Wind turb
xploiting the e
mechanical or e
r Point Track
possible to cha
ontrol of the g
s itself to ea
systems also
ind becomes t
In this co
(Tip Speed R
ol because of
aintain λ at an
DOUBLY FE
In the lite
marized in four
Electrical equ
V R
V R
V R
V R
Flux equation
The stator
ψ L
ψ 	L
ψ L
ψ 	L
Eng
Enhancem
Fig
POWER PO
bines, used for
energy availab
electrical part
king (MPPT).
ange the pitch
generator. The
ach variation
o introduce sa
too strong and
ontext, severa
Ratio) control,
its simplicity
optimal value
ED INDUCTI
erature, we fin
r types of equ
uations
i 	–
i
i
i
ns
r and rotor flux
L i Mi
L i Mi
L i Mi
L i Mi
IS
ent of the dire
gure 2. Power c
OINT TRACK
r the productio
ble in the win
, are develope
These system
h angle of the
search for the
n of wind to
afety devices
d may damage
l types of M
, Power contr
and accuracy
e so that the po
ION GENER
nd that the D
ations: electri
ω ψ
ω ψ
ω ω ψ
ω ω ψ
x are connecte
SSN: 2088-87
ect power con
coefficient as
KING STRAT
on of electrici
nd. This is wh
ed to maximiz
ms use differ
blades, or the
e maximum is
o be in a co
s that allow f
e the wind turb
MPPT algorith
rol and Hill C
y. This techniq
ower extracted
RATOR MOD
DFIG model i
ical, magnetic
ed to currents
Maximum
Power
Point (MPP)
708
trol applied to
a function of
TEGY
ity, must allow
hy many win
ze the energy
rent means to
e speed of rota
s done perman
onfiguration o
for example
bine.
hms exist. Th
Climbing [9].
que regulates
d is maximal.
DEL
in the referen
, electromagn
by the follow
o DFIG-WEC
λ and β
w the producti
d turbine con
conversion. T
obtain this m
ation of the pr
nently and the
of maximum
to limit the
ey can be di
In this work,
the rotational
ce dq related
etic and mech
wing relations:

CS (Hala Alam
ion maximum
ntrol systems,
This is called M
maximum pow
ropeller or eve
e wind turbine
m extraction o
power produ
ivided in thre
, we focus on
l speed of the
d to the rotati
hanical [10-14
(
(

mi Aroussi)
37
m of power
acting on
Maximum
wer point.
en play on
e therefore
of power.
uced when
ee groups:
n the TSR
generator
ng flux is
4].
(5)
(6)
 ISSN: 2088-8708
Int J Elec & Comp Eng, Vol. 10, No. 1, February 2020 : 35 - 46
38
4.3. Electromagnetic torque
The expression of the electromagnetic torque as a function of the stator flux and rotor current
is given by
T i ψ i ψ ) (7)
4.4. Mechanical equation
The evolution of the mechanical speed from the total mechanical torque (T ) is determined by the
fundamental equation of dynamics:
J T T T fΩ 	 (8)	
	
5. DIRECT POWER CONTROL APPLIED TO THE DFIG
5.1. Principle of the direct power of control
The basic principle of direct power control (DPC) was proposed by Noguchi [15], it is based
initially on the direct control of torque (DTC), intended for the control of the electric motors [16-20].
In the case of DPC, active and reactive powers replace torque electromagnetic and the amplitude of the stator
flux of the DTC. This non-linear control strategy is defined as a technique of direct control because it
chooses the appropriate voltage vector of the converter without any modulation technique. The basic concept
is to select the appropriate switching states from a switch table based on errors, which are limited by a band
hysteresis, present in the active and reactive powers.
Instant active and reactive powers are calculated from the expressions below:
	P ω |ψ ||ψ |sinδ (9)
	Q
3
2
ω
σL
|ψ |
L
L
|ψ |cosδ |ψ |
with : δ The angle between the stator’s flux and the rotor’s flux vectors.
σ 1
²
: Coefficient of dispersion.
The reference active power is calculated from the output of the DC bus voltage regulator UDC [21].
The reference of the reactive power is maintained at zero in order to ensure a unit power factor.
Then, the powers are compared and the errors obtained are applied to regulators of hysteresis.
5.2. Hysteresis controller
The main idea of direct power control is to maintain the instant active and reactive powers in
a desired band. This control is based on two hysteresis comparators which use as input the error signals
between the reference values and estimates of the active and reactive powers. These two controllers are
responsible for deciding how much a new switch and/or output voltage vector of the inverter is applied.
If the error of the power (ePs or eQs) is increasing and reaches the higher level, the hysteresis controller
changes its output to '1'.
5.3. Vector selection
The influence of each output vector on the active and reactive powers is very dependent on
the actual position of the vector of the source voltage Thus, in addition to the signals of the two hysteresis
controllers, the switching table operates according to the position of the vector of the source voltage, which
turns to the pulsation ( m), in the complex plan. However, instead of introducing to the switching table
the exact position of the vector of the voltage, the sector selection block informs us in which domain
the current vector of the source voltage is located [22, 23]. Therefore, we propose to use a modified DPC
which, unlike the conventional DPC, can produce twenty seven voltage vectors instead of the eight vectors.
In other words, we will decompose twelve sectors instead of six in order to increase the accuracy and also to
avoid the problems encountered in boundaries of each control vector. With this in mind, we used a five-stage
hysteresis corrector for the reactive power and a three-level corrector for the active power.
Int J E
5.4. S
vector
also b
In thi
optim
6. A
gener
6.1. S
(sub-s
induct
the sim
Elec & Comp
Switching tab
The switch
r of the inver
based on the p
is work, we a
mal minimizati
Secto
1
0
-1
=[
=[0
=[
APPLICATI
The Figur
ator for a win
Setpoint trac
The syste
synchronous,
tion generato
mulation are s
Eng
Enhancem
ble
hing table is t
rter in order to
position of the
adopted a mo
on in error po
Table
or’s Number
2
1
0
-1
-2
2
1
0
-1
-2
2
1
0
-1
-2
[0,0,0] ; =[1,0,0
0,-1,-1] ; =[0,0,
1,-1,-1] ;	 =[1,
=[0
IONS AND R
e 3 shows the
nd system in M
Figu
cking test
em is analyse
synchronous
or and the wi
shown in Figu
IS
ent of the dire
the paramoun
o orient the in
e source volta
odified switch
ower as shown
e 1. Switching
1 2 3
0] ; =[1,1,0] ;
-1] ; =[-1,0,-1
1,-1] ; =[-1,1,
0,1,-1] ; =[-1,1
RESULTS
e block diagram
Matlab/Simulin
ure 3. Direct p
ed during ste
s and super-s
nd turbine ar
ure 4.
SSN: 2088-87
ect power con
nt part in direc
nstantaneous
age vector and
hing table com
n in Table 1.
g table for 3-le
4 5
=[0,1,0] ; =[0
1] ; =[-1,0,0] ;
-1] ; =[-1,1,1]
1,0] ; =[-1,0,1]
am of the mod
nk environme
power control
eady-state an
synchronous)
re given resp
708
trol applied to
ct power contr
active and rea
d the errors of
mpared to th
evels and 5-le
6 7 8
0,1,1] ; =[0,0,1]
=[-1,-1,1] ;
] ; =[-1,-1,1] ;
] ; =[0,-1,1] ;
del used for th
nt [25]:
(DPC) block
nd transients
. The differe
ectively in T
o DFIG-WEC
rol. It selects
active powers
f the active an
at developed
vels inverter
9 10
] ; =[1,0,1] ;
=[0,-1,0] ; =
=[1,-1,1] ;
=[1,-1,0]
e control of th
diagram
conditions at
ent parameter
able 2 and T

CS (Hala Alam
the appropria
s in their desi
nd reactive po
by Noguchi
11 12
=[1,1,1] ;
=[-1,-1,-1] ;
=[1,0,-1] ;
he doubly fed
t variable wi
ers of the do
Table 3. The

mi Aroussi)
39
ate voltage
ired value,
wers [24].
to ensure
d induction
ind speed
oubly fed
results of
Int J E
40 
Elec & Comp Eng, Vol. 10,
Table 2
R
N
R
G
M
V
Figure 4. (a
, No. 1, Febru
2. Parameters
Nominal P
Stator Vo
Stator Fre
Stator Re
Stator Ind
Rotor Res
Rotor Ind
Mutual In
No. of Pa
Table 3. Pa
Rated power
Number of blades
Rotor Radius
Gearbox ratio
Moment of inertia
Viscous friction co
a) Curves of: t
uary 2020 : 35
of the doubly
DFIG Paramet
Power
oltage
equency
sistance
ductance
sistance
ductance
nductance
air of Poles
arameters of th
Turbine Parame
a
oefficient
(a)
(b)
the wind spee
5 - 46
y fed induction
ters
Pn = 1.5 KW
Vs = 220/380V
fs = 50 Hz
Rs = 1.18 Ω
Ls = 0.4 H
Rr = 1.66 Ω
Lr = 0.18 H
M = 0.17 H
P =2
he wind turbin
ters
1.5 KW
3
R = 1 m
G = 2
J = 1000Kg.m²
fv = 0.007 N.m.s-
ed, (b) the stat
n generator
ne
-1
or active pow
ISSN: 2
wer
2088-8708
Int J EElec & Comp
Figure 4. (c
Eng
Enhancem
) the stator rea
IS
ent of the dire
active power,
SSN: 2088-87
ect power con
(c)
(d)
(e)
(d) the curren
708
trol applied to
nts of the stato
o DFIG-WEC
or, (e) the curr

CS (Hala Alam
rents of the ro

mi Aroussi)
41
tor
Int J E
42
6.2. R
tempe
of the
the fo
a. Re
b. Ind
in Fig
a. Th
to
b. Th
the tra
their r

Elec & Comp
Robustness te
The param
erature increas
e parameter v
ollowing condi
esistance R m
ductances L 	a
Figure 5 sh
gure 4 and Fig
he stator activ
hysteresis con
he stator and r
From thes
ansient regime
reference valu
Eng, Vol. 10,
Figure 4. (
est
meters of the
se, skin effect
variations. So,
itions:
multiplied by 2
and L multip
hows the simu
gure 5 we can
e and reactive
ntroller but th
rotor currents
se results, w
e, and fewer d
ues. The robus
, No. 1, Febru
f) the voltages
e DFIG are
t, etc. In this c
, the robustne
2
lied by 0.5. 
ulation’s resul
ensure, even b
e powers follo
e values of po
(respectively
e can conclu
disturbance os
stness of this a
uary 2020 : 35
(f)
(g)
s of the stator
exposed to
case, the prop
ess of the com
lts obtained. C
by changing th
ow their refere
owers quickly
voltages) in th
ude that the
scillations in th
approach rema
5 - 46
, (g) the volta
variations ca
posed DPC mu
mmand used
Comparing the
he initial valu
ences with few
regain their r
he frame (a, b
technique of
he curves of t
ains good for
ges of the roto
aused by var
ust guarantee
(DPC) has be
e results of the
ues of DFIG, th
wer oscillation
eferences.
, c) have a sin
DPC has a
he various cur
the wind ener
ISSN: 2
or
rious changes
good results
een tested acc
e simulations
that:
ns and disturb
nusoidal shape
low respons
urves that quic
rgy conversion
2088-8708
s such as
regardless
cording to
illustrated
bances due
e.
se time in
ckly regain
n system.
Int J E
Figure
Elec & Comp
e 5. Curves of
Eng
Enhancem
f: (a) the stato
IS
ent of the dire
r active powe
SSN: 2088-87
ect power con
(a)
(b)
(c)
er, (b) the stato
708
trol applied to
or reactive pow
o DFIG-WEC
wer, (c) the cu

CS (Hala Alam
urrents of the

mi Aroussi)
43
stator
Int J E
44
Figu

Elec & Comp
ure 5. Curves
Eng, Vol. 10,
of: (d) the cu
, No. 1, Febru
urrents of the r
uary 2020 : 35
(d)
(e)
(f)
rotor, (e) the v
5 - 46
voltages of thee stator, (f) the
ISSN: 2
e voltages of t
2088-8708
the rotor
Int J Elec & Comp Eng ISSN: 2088-8708 
Enhancement of the direct power control applied to DFIG-WECS (Hala Alami Aroussi)
45
7. CONCLUSION
This work proposes an improvement of the classical DPC control applied to the doubly fed
induction generator (DFIG) integrated in a wind energy conversion system 'WECS'. The whole system is
modeled and simulated in the environment Matlab/Simulink. Also, a technique (TSR) to reach
the maximum power point (MPP) is presented in order to capture the maximum of power. The results
(setpoint tracking and robustness test) in steady and transient regimes show a complete correlation. They both
prove the robustness and efficiency of the method developed. In general, the simulation’s results obtained
during the application of the control under variable speed show an excellent dynamic performance and
tracking ability of the powers generated at the corresponding reference values with the preservation of
sinusoidal shapes for both currents and voltages (stator and rotor).
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[21] J. Lopez, E. Gubia, P. Sanchis, X. Roboam, L. Marroyo, "Wind turbines based on doubly fed induction generator
under asymmetrical voltage dips", IEEE Trans. Energy Convers., vol. 23, no. 1, pp. 321-330, Mar. 2008.
[22] L. Xu, "Coordinated control of DFIG's rotor and grid side converters during network unbalance", IEEE Trans.
Power Electron., vol. 23, no. 3, pp. 1041-1049, May 2008.
[23] Dawei Zhi, Lie Xu. "Direct Power Control of DFIG With Constant Switching Frequency and Improved Transient
Performance," IEEE Trans. on Energy Conversion, 22(1):110-118, 2007.
Int J E
46
[24] S
s
p
[25] G
i
E
BIOG

Elec & Comp
Shanzhi Li, Ha
systems based
pp 431-439, 20
G. Abad, M. A
induction mach
Electron., vol. 2
GRAPHIES O
Eng, Vol. 10,
aoping Wang, Y
on an intellig
16.
A. Rodrguez, J
hine with reduc
23, no. 3, pp. 10
OF AUTHOR
Hala Alami
Engineering
currently pur
Oujda, Moro
maintenance
conversion sy
Elmostafa Z
University, T
Department o
of electrical e
application o
systems and
systems "win
power electro
Bouderbala
Sciences Dh
She is memb
Industrial Au
interests incl
electronics.
Badre Bosso
degree in Ele
of Sciences,
and Compute
in 2013. He
Sciences Dh
His research
Smart Grid, R
, No. 1, Febru
Yang Tian, Abd
gent proportion
J. Poza, "Two
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050-1061, May
RS
i Aroussi rec
from Sidi M
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occo. She is
(LGEM). Her
ystems using a
Ziani received
Tangier, Moroc
of the Ecole Su
engineering and
of intelligent ins
the contributi
nd and photov
onics and autom
Manale is a
ar El Mahraz,
ber of LISTA
utomated System
ude Renewable
oufi was born i
ectrical Engine
Morocco and P
er, Romanie and
is a Professor
ar El Mahraz,
interests includ
Renewable Ene
uary 2020 : 35
del Aitouch, Jo
nal-integral sli
level VSC bas
flux ripples at l
y 2008.
ceived her M
Mohammed Ben
D in Electrica
a member of
r research inter
doubly fed indu
his PhD in El
cco. Currently,
upérieur de Tec
d maintenance.
strumentation t
ion to the con
voltaic".His re
mation.
Ph.D. Student
Sidi Mohamm
Laboratory. S
ms at the Facul
e Energy, static
in Fez city, Mo
eering from Uni
PhD. degree fr
nd Montefiore In
of Electrical E
Sidi Mohamm
de static conve
ergy and Artific
5 - 46
ohn Klein, “Dir
iding mode co
sed predictive
low constant sw
M.S degree in
n Abdellah Un
al Engineering
f the laborator
rests include m
uction machine
lectrical Engin
he is the dire
chnologie-Oujd
He is author o
to the monitorin
ntrol and optim
search interest
in Electrical E
med Ben Abde
She had her m
lty of Sciences
c converters, e
orocco, on May
iversity Sidi M
rom University
nstitute of elect
Engineering, at
med Ben Abde
erters, electrical
cial Intelligent.
ect power cont
ontrol”, ISA T
direct torque c
witching freque
Industrial Au
niversity, Fez,
at Mohamed P
y of electrica
modeling, contr
and renewable
eering from Ab
ector of the Ap
a and a membe
of several articl
ng of complex
mization of ele
ts include elec
Engineering fro
ellah University
master's degree
Dhar el Mahrez
lectrical motor
y 21, 1985. He
Mohammed Ben
of Pitesti, Fac
trical engineeri
the LISTA Lab
ellah University
l motor drives,
ISSN: 2
trol of DFIG w
Transactions, V
control of the
ency", IEEE Tr
utomated Syst
Morocco. Sh
Premier Univer
al engineering
rol of wind en
e energy.
Abdelmalek Ess
pplied Enginee
er of the labora
les dealing with
systems, indus
ectrical conver
ctrical engineer
rom the Faculty
y, Fez - Moro
in Engineering
z Fez. Her rese
r drives, and po
received the P
n Abdellah, Fac
culty of Electro
ing, Luik, Belg
boratory Facult
y, Fez - Moro
power electron
2088-8708
wind turbine
Volume 64,
doubly fed
ans. Power
tems
he is
rsity,
and
ergy
saadi
ering
atory
h the
strial
rsion
ring,
y of
occo.
g of
earch
ower
Ph.D.
culty
onics
ium,
ty of
occo.
nics,

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Enhancement of the direct power control applied to DFIG-WECS

  • 1. International Journal of Electrical and Computer Engineering (IJECE) Vol. 10, No. 1, February 2020, pp. 35~46 ISSN: 2088-8708, DOI: 10.11591/ijece.v10i1.pp35-46  35 Journal homepage: http://ijece.iaescore.com/index.php/IJECE Enhancement of the direct power control applied to DFIG-WECS Hala Alami Aroussi1 , ElMostafa Ziani2 , Manale Bouderbala3 , Badre Bossoufi4 1,2 Laboratory of Electrical and Maintenance Engineering (LGEM), Mohamed Premier University, Oujda, Morocco 3,4 LISTA Laboratory, Faculty of Sciences Dhar El Mahraz, Sidi Mohammed Ben Abdellah University, Fez, Morocco Article Info ABSTRACT Article history: Received Oct 29, 2018 Revised Jul 20, 2019 Accepted Aug 29, 2019 This work is dedicated to the study of an improved direct control of powers of the doubly fed induction generator (DFIG) incorporated in a wind energy conversion system 'WECS'. The control method adopts direct power control 'DPC' because of its various advantages like the ease of implementation which allows decoupled regulation for active and reactive powers, as well as a good performance at transient and steady state without PI regulators and rotating coordinate transformations. To do this, the modeling of the turbine and generator is performed. Therefore, the Maximum Power Point Tracking (MPPT) technology is implemented to extract optimal power at variable wind speed conditions. Subsequently, an explanation of the said command is spread out as well as the principle of adjusting the active and reactive power according to the desired speed. Then, the estimation method of these two control variables will be presented as well as the adopted switching table of the hysteresis controller model used based on the model of the multilevel inverters. Finally, the robustness of the developed system will be analyzed with validation in Matlab/Simulink environment to illustrate the performance of this command. Keywords: DFIG DPC Hysteresis controllers MPPT WECS Copyright © 2020 Institute of Advanced Engineering and Science. All rights reserved. Corresponding Author: Hala Alami Aroussi, Laboratory of Electrical and Maintenance Engineering (LGEM), Ecole Supérieur de Technologie, Mohamed Premier University, BP 473 Complexe universitaire Al Qods, Oujda 60000 Oujda, Morocco. Email : h.alamiarroussi@ump.ac.ma, alami.aroussi.hala@gmail.com 1. INTRODUCTION The production of electrical energy in the world generates various pollutions. Thus, thermal power stations (coal, oil) are responsible for atmospheric emissions linked to the combustion of fossil fuels. In contrast, nuclear power plants, whose development will increase following the oil crisis, have no adverse influence on air quality although they produce radioactive waste that causes storage problems, treatment or transport. Today, the fear of being limited to ephemeral energies, the awareness of the negative impact of these on the environment, the craze for renewable energies and the opening of the market of the production of energy towards other alternatives are factors that give an important place to these energies (hydraulic, wind, solar, biomass, ...) in the production of electricity [1-3]. Among the most coveted renewable energies, we find the wind energy that interests more and more countries as it produces a clean and sustainable energy. We also notice that a large part of wind turbines installed today is equipped with a doubly fed induction generator (DFIG). The latter allows the production of electricity under variable speed, this makes it possible to better exploit turbine resources. These turbines are also equipped with variable blade pitch angle in order to be adapted to different wind conditions. The turbine is controlled so as to permanently maximize the power produced independently of the variation of the wind profile [4].
  • 2. Int J E 36 a DFI is to contro the DP and si 2. T a theo the fo the sp of the Nume expre a func With and : the co passes design  Elec & Comp The main IG in a wind e ensure the sa ol of the activ In this pe PC control law imulation resu TURBINE M A theoreti oretical power P The aerod ollowing formu P . The powe peed ratio λ an e blades and th λ erical approxi ssions have be In the con ction of the sp C λ, β : c1= 0.587 . Figure 2 oefficient C s through a m nate by λ (w Eng, Vol. 10, objective of t energy conver ampling of sin e and reactive erspective, a w [5-7]. The w ults are expose Figure 1. S MODEL ically undistu r of the wind o . ρ. A. v dynamic pow ula: . ρ. A. C λ, β er coefficient C nd the pitch an he wind speed imations have een proposed ntext of this peed λ and the c c . 2, c2= 116, c3 . . shows the as a function maximum (C _ where λ , No. 1, Febru this work is to rsion system ( nusoidal curre e powers. complete mo whole of the s ed and analyze Synopsis of the urbed wind cr or wind power wer appearing . v C λ, β repre ngle of the bla d: e been develo [4, 8]. work, we wil angle β as fol c . β c . 3 = 0.4, c4= 5 simulation of the speed _ 0.48) f 8). uary 2020 : 35 o study the dir (WECS) as sh ents while gu odeling of the system is imp ed in order to e direct power rossing a surf r correspondin g at the roto esents the aero ade β. The spe oped in the lit ll use an app llows: e c . λ , c5 = 21, c6= results unde d ratio λ for a for β 0 and 5 - 46 rect power co hown in Figure uaranteeing a e architecture plemented und prove the effi r control of th face A withou ng to the follo or of the turb odynamic effi eed ratio is de terature to mo proximate exp λ = 0.0085. er MATLAB/ few pitch an d a particular ontrol (active a e 1. The comm unit power fa e is proposed der the Matlab iciency of the e DFIG-WEC ut a decrease wing expressi bine is deter iciency of the efined as the r odel the coeff pression of th /SIMULINK gles β. We no value of the s ISSN: 2 and reactive) mon goal of th factor with a d in order to b/Simulink en control. CS in speed v w ion: ( rmined analy ( e turbine. It d ratio of the lin ( ficient C and he power coef ( of the evo ote that this c speed ratio th 2088-8708 applied to his control decoupled elaborate vironment would give (1) tically by (2) epends on near speed (3) d different fficient as (4) olution of coefficient at we will
  • 3. Int J E 3. M by ex the m Power It is p the co adapts Such the wi TSR contro to ma 4. D summ 4.1. E 4.2. F Elec & Comp MAXIMUM Wind turb xploiting the e mechanical or e r Point Track possible to cha ontrol of the g s itself to ea systems also ind becomes t In this co (Tip Speed R ol because of aintain λ at an DOUBLY FE In the lite marized in four Electrical equ V R V R V R V R Flux equation The stator ψ L ψ L ψ L ψ L Eng Enhancem Fig POWER PO bines, used for energy availab electrical part king (MPPT). ange the pitch generator. The ach variation o introduce sa too strong and ontext, severa Ratio) control, its simplicity optimal value ED INDUCTI erature, we fin r types of equ uations i – i i i ns r and rotor flux L i Mi L i Mi L i Mi L i Mi IS ent of the dire gure 2. Power c OINT TRACK r the productio ble in the win , are develope These system h angle of the search for the n of wind to afety devices d may damage l types of M , Power contr and accuracy e so that the po ION GENER nd that the D ations: electri ω ψ ω ψ ω ω ψ ω ω ψ x are connecte SSN: 2088-87 ect power con coefficient as KING STRAT on of electrici nd. This is wh ed to maximiz ms use differ blades, or the e maximum is o be in a co s that allow f e the wind turb MPPT algorith rol and Hill C y. This techniq ower extracted RATOR MOD DFIG model i ical, magnetic ed to currents Maximum Power Point (MPP) 708 trol applied to a function of TEGY ity, must allow hy many win ze the energy rent means to e speed of rota s done perman onfiguration o for example bine. hms exist. Th Climbing [9]. que regulates d is maximal. DEL in the referen , electromagn by the follow o DFIG-WEC λ and β w the producti d turbine con conversion. T obtain this m ation of the pr nently and the of maximum to limit the ey can be di In this work, the rotational ce dq related etic and mech wing relations:  CS (Hala Alam ion maximum ntrol systems, This is called M maximum pow ropeller or eve e wind turbine m extraction o power produ ivided in thre , we focus on l speed of the d to the rotati hanical [10-14 ( (  mi Aroussi) 37 m of power acting on Maximum wer point. en play on e therefore of power. uced when ee groups: n the TSR generator ng flux is 4]. (5) (6)
  • 4.  ISSN: 2088-8708 Int J Elec & Comp Eng, Vol. 10, No. 1, February 2020 : 35 - 46 38 4.3. Electromagnetic torque The expression of the electromagnetic torque as a function of the stator flux and rotor current is given by T i ψ i ψ ) (7) 4.4. Mechanical equation The evolution of the mechanical speed from the total mechanical torque (T ) is determined by the fundamental equation of dynamics: J T T T fΩ (8) 5. DIRECT POWER CONTROL APPLIED TO THE DFIG 5.1. Principle of the direct power of control The basic principle of direct power control (DPC) was proposed by Noguchi [15], it is based initially on the direct control of torque (DTC), intended for the control of the electric motors [16-20]. In the case of DPC, active and reactive powers replace torque electromagnetic and the amplitude of the stator flux of the DTC. This non-linear control strategy is defined as a technique of direct control because it chooses the appropriate voltage vector of the converter without any modulation technique. The basic concept is to select the appropriate switching states from a switch table based on errors, which are limited by a band hysteresis, present in the active and reactive powers. Instant active and reactive powers are calculated from the expressions below: P ω |ψ ||ψ |sinδ (9) Q 3 2 ω σL |ψ | L L |ψ |cosδ |ψ | with : δ The angle between the stator’s flux and the rotor’s flux vectors. σ 1 ² : Coefficient of dispersion. The reference active power is calculated from the output of the DC bus voltage regulator UDC [21]. The reference of the reactive power is maintained at zero in order to ensure a unit power factor. Then, the powers are compared and the errors obtained are applied to regulators of hysteresis. 5.2. Hysteresis controller The main idea of direct power control is to maintain the instant active and reactive powers in a desired band. This control is based on two hysteresis comparators which use as input the error signals between the reference values and estimates of the active and reactive powers. These two controllers are responsible for deciding how much a new switch and/or output voltage vector of the inverter is applied. If the error of the power (ePs or eQs) is increasing and reaches the higher level, the hysteresis controller changes its output to '1'. 5.3. Vector selection The influence of each output vector on the active and reactive powers is very dependent on the actual position of the vector of the source voltage Thus, in addition to the signals of the two hysteresis controllers, the switching table operates according to the position of the vector of the source voltage, which turns to the pulsation ( m), in the complex plan. However, instead of introducing to the switching table the exact position of the vector of the voltage, the sector selection block informs us in which domain the current vector of the source voltage is located [22, 23]. Therefore, we propose to use a modified DPC which, unlike the conventional DPC, can produce twenty seven voltage vectors instead of the eight vectors. In other words, we will decompose twelve sectors instead of six in order to increase the accuracy and also to avoid the problems encountered in boundaries of each control vector. With this in mind, we used a five-stage hysteresis corrector for the reactive power and a three-level corrector for the active power.
  • 5. Int J E 5.4. S vector also b In thi optim 6. A gener 6.1. S (sub-s induct the sim Elec & Comp Switching tab The switch r of the inver based on the p is work, we a mal minimizati Secto 1 0 -1 =[ =[0 =[ APPLICATI The Figur ator for a win Setpoint trac The syste synchronous, tion generato mulation are s Eng Enhancem ble hing table is t rter in order to position of the adopted a mo on in error po Table or’s Number 2 1 0 -1 -2 2 1 0 -1 -2 2 1 0 -1 -2 [0,0,0] ; =[1,0,0 0,-1,-1] ; =[0,0, 1,-1,-1] ; =[1, =[0 IONS AND R e 3 shows the nd system in M Figu cking test em is analyse synchronous or and the wi shown in Figu IS ent of the dire the paramoun o orient the in e source volta odified switch ower as shown e 1. Switching 1 2 3 0] ; =[1,1,0] ; -1] ; =[-1,0,-1 1,-1] ; =[-1,1, 0,1,-1] ; =[-1,1 RESULTS e block diagram Matlab/Simulin ure 3. Direct p ed during ste s and super-s nd turbine ar ure 4. SSN: 2088-87 ect power con nt part in direc nstantaneous age vector and hing table com n in Table 1. g table for 3-le 4 5 =[0,1,0] ; =[0 1] ; =[-1,0,0] ; -1] ; =[-1,1,1] 1,0] ; =[-1,0,1] am of the mod nk environme power control eady-state an synchronous) re given resp 708 trol applied to ct power contr active and rea d the errors of mpared to th evels and 5-le 6 7 8 0,1,1] ; =[0,0,1] =[-1,-1,1] ; ] ; =[-1,-1,1] ; ] ; =[0,-1,1] ; del used for th nt [25]: (DPC) block nd transients . The differe ectively in T o DFIG-WEC rol. It selects active powers f the active an at developed vels inverter 9 10 ] ; =[1,0,1] ; =[0,-1,0] ; = =[1,-1,1] ; =[1,-1,0] e control of th diagram conditions at ent parameter able 2 and T  CS (Hala Alam the appropria s in their desi nd reactive po by Noguchi 11 12 =[1,1,1] ; =[-1,-1,-1] ; =[1,0,-1] ; he doubly fed t variable wi ers of the do Table 3. The  mi Aroussi) 39 ate voltage ired value, wers [24]. to ensure d induction ind speed oubly fed results of
  • 6. Int J E 40  Elec & Comp Eng, Vol. 10, Table 2 R N R G M V Figure 4. (a , No. 1, Febru 2. Parameters Nominal P Stator Vo Stator Fre Stator Re Stator Ind Rotor Res Rotor Ind Mutual In No. of Pa Table 3. Pa Rated power Number of blades Rotor Radius Gearbox ratio Moment of inertia Viscous friction co a) Curves of: t uary 2020 : 35 of the doubly DFIG Paramet Power oltage equency sistance ductance sistance ductance nductance air of Poles arameters of th Turbine Parame a oefficient (a) (b) the wind spee 5 - 46 y fed induction ters Pn = 1.5 KW Vs = 220/380V fs = 50 Hz Rs = 1.18 Ω Ls = 0.4 H Rr = 1.66 Ω Lr = 0.18 H M = 0.17 H P =2 he wind turbin ters 1.5 KW 3 R = 1 m G = 2 J = 1000Kg.m² fv = 0.007 N.m.s- ed, (b) the stat n generator ne -1 or active pow ISSN: 2 wer 2088-8708
  • 7. Int J EElec & Comp Figure 4. (c Eng Enhancem ) the stator rea IS ent of the dire active power, SSN: 2088-87 ect power con (c) (d) (e) (d) the curren 708 trol applied to nts of the stato o DFIG-WEC or, (e) the curr  CS (Hala Alam rents of the ro  mi Aroussi) 41 tor
  • 8. Int J E 42 6.2. R tempe of the the fo a. Re b. Ind in Fig a. Th to b. Th the tra their r  Elec & Comp Robustness te The param erature increas e parameter v ollowing condi esistance R m ductances L a Figure 5 sh gure 4 and Fig he stator activ hysteresis con he stator and r From thes ansient regime reference valu Eng, Vol. 10, Figure 4. ( est meters of the se, skin effect variations. So, itions: multiplied by 2 and L multip hows the simu gure 5 we can e and reactive ntroller but th rotor currents se results, w e, and fewer d ues. The robus , No. 1, Febru f) the voltages e DFIG are t, etc. In this c , the robustne 2 lied by 0.5.  ulation’s resul ensure, even b e powers follo e values of po (respectively e can conclu disturbance os stness of this a uary 2020 : 35 (f) (g) s of the stator exposed to case, the prop ess of the com lts obtained. C by changing th ow their refere owers quickly voltages) in th ude that the scillations in th approach rema 5 - 46 , (g) the volta variations ca posed DPC mu mmand used Comparing the he initial valu ences with few regain their r he frame (a, b technique of he curves of t ains good for ges of the roto aused by var ust guarantee (DPC) has be e results of the ues of DFIG, th wer oscillation eferences. , c) have a sin DPC has a he various cur the wind ener ISSN: 2 or rious changes good results een tested acc e simulations that: ns and disturb nusoidal shape low respons urves that quic rgy conversion 2088-8708 s such as regardless cording to illustrated bances due e. se time in ckly regain n system.
  • 9. Int J E Figure Elec & Comp e 5. Curves of Eng Enhancem f: (a) the stato IS ent of the dire r active powe SSN: 2088-87 ect power con (a) (b) (c) er, (b) the stato 708 trol applied to or reactive pow o DFIG-WEC wer, (c) the cu  CS (Hala Alam urrents of the  mi Aroussi) 43 stator
  • 10. Int J E 44 Figu  Elec & Comp ure 5. Curves Eng, Vol. 10, of: (d) the cu , No. 1, Febru urrents of the r uary 2020 : 35 (d) (e) (f) rotor, (e) the v 5 - 46 voltages of thee stator, (f) the ISSN: 2 e voltages of t 2088-8708 the rotor
  • 11. Int J Elec & Comp Eng ISSN: 2088-8708  Enhancement of the direct power control applied to DFIG-WECS (Hala Alami Aroussi) 45 7. CONCLUSION This work proposes an improvement of the classical DPC control applied to the doubly fed induction generator (DFIG) integrated in a wind energy conversion system 'WECS'. The whole system is modeled and simulated in the environment Matlab/Simulink. Also, a technique (TSR) to reach the maximum power point (MPP) is presented in order to capture the maximum of power. The results (setpoint tracking and robustness test) in steady and transient regimes show a complete correlation. They both prove the robustness and efficiency of the method developed. In general, the simulation’s results obtained during the application of the control under variable speed show an excellent dynamic performance and tracking ability of the powers generated at the corresponding reference values with the preservation of sinusoidal shapes for both currents and voltages (stator and rotor). REFERENCES [1] M. Bouderbala, B. Bossoufi, A. Lagrioui, M. Taoussi, Y. Ihedrane, H. Alami Aroussi, “Direct and Indirect Vector Control of a Douby Fed Induction Generator based in a Wind Energy Conversion System,” in International Journal of Electrical and Computer Engineering (IJECE), vol. 9, no. 3, pp. 1531-1540, 2019. [2] B. Bossoufi, M. Karim, A. Lagrioui, M. Taoussi, "FPGA-Based Implementation nonlinear Backstepping control of a PMSM Drive," International Journal of Power Electronics and Drive System (IJPEDS), vol. 4(1), pp. 12-23, 2014. [3] Z. Chen, J. M. Guerrero and F. Blaabjerg, "A review of the state of the art of power electronics for wind turbines," IEEE Transactions on Power Electronics, vol. 24, no. 8, pp. 1859-1875, 2009. [4] T. Ackermann, Wind power in power systems, John Wiley and Sons, Ltd, Londres, 2005. [5] H. Alami Aroussi, el. M. Ziani, B. Bossoufi, “Contribution to the enhancement of dual DTC Application: Doubly fed induction motor,” International Conference On Advanced Technologies For Signal& Image Processing ATSIP'2017, May 2017. [6] B. Bossoufi, S. Ionita, H. Alami Aroussi, M. El Ghamrasni, Y. Ihedrane, “Managing voltage drops a variable speed wind turbine connected to the grid,” in International Journal of Automation and Control, vol. 1(1), pp. 15-34, 2017. [7] H. Alami Aroussi, El. M. Ziani, B. Bossoufi, “Speed Control Of The Doubly Fed Induction Generator Applied To A Wind System,” in Journal Of Theoretical And Applied Information Technology, vol. 83, no. 3, pp. 426-433, 2016. [8] S. Heier, Grid Integration of Wind Energy Conversion Systems, Publications John Wiley & Sons, 1998. [9] Lalouni S, Rekioua Djamila, Idjdarene, Kassa and Tounzi Abdelmounaim, "An improved MPPT algorithm for wind energy conversion system," J. Electr. Syst., vol. 10, pp. 484-494, 2014. [10] S. Muller, M. Deicke, R. W. De Doncker, “Doudly Fed Induction Genertor Systems for Wind Turbines,” IEEE Industry Applications Magazine, 2003. [11] J. P. Caron, J. Hautier, Modélisation et commande de la machine asynchrone, Edition Technip, 1995. [12] F. Mei, B. Pal, “Modelling and small-signal analysis of a grid connected doubly-fed induction generator,” Power Engineering Society General Meeting, vol. 3, no. 1, pp. 2101-2108, 2005. [13] S. Li, S. Sinha, “A Simulation Analysis of Double-Fed Induction Generator for Wind Energy Conversion Using Pspice,” Power Engineering Society General Meeting, IEEE, 2006. [14] B. Babypria, R. Anita, “Modelling, Simulation and Analysis of Doubly Fed Induction Generator for Wind Turbines,” Journal of Electrical Engineering, vol. 60, no. 2, pp. 79-85, 2009. [15] T. Noguchi, H. Tomiki, S. Kondo, and I. Takahashi, “Direct power control of PWM converter without power source voltage sensors,” IEEE Industry Applications Conference, Thirty-First IAS Annual Meeting, IAS '96, vol. 2, pp. 941–946, 1996. [16] Y. Djeriri, A. Meroufel, B. Belabbes and A. Massoum, “Three-level NPC voltage source converter based direct power control of the doubly fed induction generator at low constant switching frequency,” Revue des Energies Renouvelables, Centre de Développement des Energies Renouvelables- CDER, Algérie, vol. 16, no. 1, pp. 91-103, 2013. [17] Y. A Chapuis, “Contrôle Directe du Couple d’une Machine Asynchrone par L’orientation de son Flux Statorique,” Thèse Doctorat INPG, génie électrique. [18] Nik Rumzi Nik Idris, and Abdul Halim Mohamed Yatim, “Direct Torque Control of Induction Machines with Constant Switching Frequency and Reduced Torque Ripple,” IEEE Transactions on Industrial Electronics, vol. 51, no. 4, 2004. [19] Rachid, D; Othman, H.; Faouzi, B., “A Completely Vectored Direct Torque Control Scheme for Induction Motor,” Systems, Man and Cybernetics, IEEE International Conference, vol. 5, 2002. [20] Buja, G.; Casadei, D.; Serra, G., “Direct torque control of induction motor drives,” Proceedings of The IEEE International Symposium, vol. 1, 1997. [21] J. Lopez, E. Gubia, P. Sanchis, X. Roboam, L. Marroyo, "Wind turbines based on doubly fed induction generator under asymmetrical voltage dips", IEEE Trans. Energy Convers., vol. 23, no. 1, pp. 321-330, Mar. 2008. [22] L. Xu, "Coordinated control of DFIG's rotor and grid side converters during network unbalance", IEEE Trans. Power Electron., vol. 23, no. 3, pp. 1041-1049, May 2008. [23] Dawei Zhi, Lie Xu. "Direct Power Control of DFIG With Constant Switching Frequency and Improved Transient Performance," IEEE Trans. on Energy Conversion, 22(1):110-118, 2007.
  • 12. Int J E 46 [24] S s p [25] G i E BIOG  Elec & Comp Shanzhi Li, Ha systems based pp 431-439, 20 G. Abad, M. A induction mach Electron., vol. 2 GRAPHIES O Eng, Vol. 10, aoping Wang, Y on an intellig 16. A. Rodrguez, J hine with reduc 23, no. 3, pp. 10 OF AUTHOR Hala Alami Engineering currently pur Oujda, Moro maintenance conversion sy Elmostafa Z University, T Department o of electrical e application o systems and systems "win power electro Bouderbala Sciences Dh She is memb Industrial Au interests incl electronics. Badre Bosso degree in Ele of Sciences, and Compute in 2013. He Sciences Dh His research Smart Grid, R , No. 1, Febru Yang Tian, Abd gent proportion J. Poza, "Two ed torque and f 050-1061, May RS i Aroussi rec from Sidi M rsuing her Ph. occo. She is (LGEM). Her ystems using a Ziani received Tangier, Moroc of the Ecole Su engineering and of intelligent ins the contributi nd and photov onics and autom Manale is a ar El Mahraz, ber of LISTA utomated System ude Renewable oufi was born i ectrical Engine Morocco and P er, Romanie and is a Professor ar El Mahraz, interests includ Renewable Ene uary 2020 : 35 del Aitouch, Jo nal-integral sli level VSC bas flux ripples at l y 2008. ceived her M Mohammed Ben D in Electrica a member of r research inter doubly fed indu his PhD in El cco. Currently, upérieur de Tec d maintenance. strumentation t ion to the con voltaic".His re mation. Ph.D. Student Sidi Mohamm Laboratory. S ms at the Facul e Energy, static in Fez city, Mo eering from Uni PhD. degree fr nd Montefiore In of Electrical E Sidi Mohamm de static conve ergy and Artific 5 - 46 ohn Klein, “Dir iding mode co sed predictive low constant sw M.S degree in n Abdellah Un al Engineering f the laborator rests include m uction machine lectrical Engin he is the dire chnologie-Oujd He is author o to the monitorin ntrol and optim search interest in Electrical E med Ben Abde She had her m lty of Sciences c converters, e orocco, on May iversity Sidi M rom University nstitute of elect Engineering, at med Ben Abde erters, electrical cial Intelligent. ect power cont ontrol”, ISA T direct torque c witching freque Industrial Au niversity, Fez, at Mohamed P y of electrica modeling, contr and renewable eering from Ab ector of the Ap a and a membe of several articl ng of complex mization of ele ts include elec Engineering fro ellah University master's degree Dhar el Mahrez lectrical motor y 21, 1985. He Mohammed Ben of Pitesti, Fac trical engineeri the LISTA Lab ellah University l motor drives, ISSN: 2 trol of DFIG w Transactions, V control of the ency", IEEE Tr utomated Syst Morocco. Sh Premier Univer al engineering rol of wind en e energy. Abdelmalek Ess pplied Enginee er of the labora les dealing with systems, indus ectrical conver ctrical engineer rom the Faculty y, Fez - Moro in Engineering z Fez. Her rese r drives, and po received the P n Abdellah, Fac culty of Electro ing, Luik, Belg boratory Facult y, Fez - Moro power electron 2088-8708 wind turbine Volume 64, doubly fed ans. Power tems he is rsity, and ergy saadi ering atory h the strial rsion ring, y of occo. g of earch ower Ph.D. culty onics ium, ty of occo. nics,