Inter
national
J
our
nal
of
P
o
wer
Electr
onics
and
Dri
v
e
System
(IJPEDS)
V
ol.
17,
No.
3,
September
2026,
pp.
1822
∼
1830
ISSN:
2088-8694,
DOI:
10.11591/ijpeds.v17.i3.pp1822-1830
❒
1822
Comparati
v
e
simulation
of
fractional-order
PD
sliding
mode
and
fuzzy
logic
contr
ollers
f
or
a
second-order
discr
ete-time
nonlinear
system
Ahmed
Bennaoui
1
,
Salah
Benzian
1
,
Hamza
Sulimani
2
,
Aissa
Ameur
3
1
Institute
of
Sciences,
Uni
v
ersity
Center
Aou
El
Cherif
Bouchoucha,
Aou,
Algeria
2
Department
of
Computer
and
Netw
ork
Engineering,
Colle
ge
of
Computing,
Umm
Al-Qura
Uni
v
ersity
,
Makkah,
Saudi
Arabia
3
F
aculty
of
T
echnology
,
Uni
v
ersity
of
Amar
T
elidji,
Laghouat,
Algeria
Article
Inf
o
Article
history:
Recei
v
ed
Oct
20,
2025
Re
vised
May
15,
2026
Accepted
Jul
8,
2026
K
eyw
ords:
Fractional-order
control
Fuzzy
logic
control
Nonlinear
systems
Po
wer
electronics
and
dri
v
e
systems
Sliding
mode
control
ABSTRA
CT
T
ight
output
re
gulation
in
po
wer
con
v
erters
and
electric
dri
v
e
systems
requires
a
control
strate
gy
that
simul
taneously
minimizes
tracking
error
and
maintains
smooth
actuation—tw
o
objecti
v
es
that
are
intrinsically
in
tension
for
nonlinear
,
pa
rameter
-v
arying
plants.
Despite
the
widespread
deplo
yment
of
fractional-order
PD
sliding
mode
control
(FOPD-SMC)
and
Mamdani
fuzzy
logic
control
(FLC)
in
this
domain,
no
prior
study
has
placed
them
in
a
direct,
metric-identical
comparison
on
a
common
plant.
The
present
w
ork
closes
this
g
ap
by
implementing
both
controllers
on
the
same
second-order
discrete-time
nonlinear
pla
nt—representati
v
e
of
DC-DC
con
v
erter
output
dynamics
and
motor
-dri
v
e
input-output
beha
vi
or
and
e
v
aluating
them
under
a
composite
reference
that
combines
sinusoidally-modulated
ramps
with
step
transitions,
scored
by
the
inte
gral
of
squared
error
(ISE)
and
int
e
gral
of
absolute
error
(IAE).
FOPD-SMC
achie
v
es
ISE
=
1
.
63
9
×
10
−
2
and
IAE
=
3
.
345
×
10
−
2
,
outperforming
FLC
by
87.6%
and
50.4%,
respecti
v
ely;
the
adv
antage
originates
from
the
non-inte
ger
memory
embedded
in
the
sliding
surf
ace
via
the
Gr
¨
unw
ald–Letnik
o
v
operator
and
from
the
e
xplicit
decomposition
of
the
control
la
w
into
nominal-tracking
and
rob
ustness
components.
FLC,
con
v
ersely
,
produces
a
chattering-free,
continuously
v
arying
control
signal
a
structural
consequence
of
smooth
Gaussian
membership
functions
and
linguistic
rule
aggre
g
ation,
at
the
cost
of
a
mean
absolute
tracking
error
twice
that
of
FOPD-SMC.
These
ndings
establish
a
quantitati
v
e
selection
criterion:
FOPD-SMC
is
recommended
when
tight
v
oltage
or
current
re
gulation
is
the
primary
objecti
v
e,
while
FLC
is
preferred
where
smooth
torque
deli
v
ery
and
reduced
actuator
stress
outweigh
mar
ginal
g
ains
in
tracking
accurac
y
.
This
is
an
open
access
article
under
the
CC
BY
-SA
license
.
Corresponding
A
uthor:
Ahmed
Bennaoui
Institute
of
Sciences,
Uni
v
ersity
Center
Aou
El
Cherif
Bouchoucha
Aou
03001,
Algeria
Email:
a.bennaoui@cu-aou.edu.dz
1.
INTR
ODUCTION
The
proliferation
of
grid-connected
in
v
erters,
DC–DC
switched-mode
po
wer
supplies,
and
v
ariable-speed
electric
dri
v
es
has
placed
increasingly
stringent
demands
on
closed-loop
re
gulation:
tight
v
oltage
and
current
control
in
con
v
erter
stages,
precise
speed
tracking
with
f
ast
disturbance
rejection
in
dri
v
e
J
ournal
homepage:
http://ijpeds.iaescor
e
.com
Evaluation Warning : The document was created with Spire.PDF for Python.
Int
J
Po
w
Elec
&
Dri
Syst
ISSN:
2088-8694
❒
1823
systems,
and,
in
both
cases,
a
control
signal
that
does
not
induce
e
xcessi
v
e
switching
stress
or
mechanical
wear
.
Meeting
these
objecti
v
es
simultaneously
is
non-tri
vial,
because
po
wer
electronic
plants
are
inherently
nonlinear
-switching
phenomena,
magnetic
saturation,
and
duty-c
ycle-dependent
operating
points
generate
beha
viors
that
linear
time-in
v
ariant
models
cannot
reproduce—and
because
precision
and
smoothness
are
intrinsically
competing
requirements:
a
more
aggressi
v
e
la
w
reduces
tracking
error
while
typically
e
xciting
higher
-frequenc
y
actuation
[1],
[2].
Fix
ed-g
ain
proport
ional-inte
gral-deri
v
ati
v
e
(PID)
re
gulators,
despite
their
industrial
pre
v
alence,
are
especially
sensiti
v
e
to
this
tension:
t
h
e
ir
parameters
are
tuned
at
a
nominal
operating
point
and
de
grade
under
nonlinear
e
xcursions
or
parameter
drift
[3],
making
adv
anced
model-e
xible
strate
gies
necessary
for
demanding
con
v
erter
and
dri
v
e
applications.
T
w
o
paradigms
ha
v
e
attracted
sustained
research
attention
in
this
conte
xt.
Sliding
mode
control
(SMC)
achie
v
es
rob
ust
disturbance
rejection
by
conning
the
system
trajectory
to
a
designer
-chosen
manifold;
be
yond
that
manifold,
matched
perturbations
are
structurally
decoupled
from
the
closed-loop
output
[1],
[2].
Finite-time
con
v
er
gence
e
xtensions-T
erminal
SMC
[4],
nonsingular
f
ast
TSMC
[5],
and
global
terminal
SMC
[6]-tighten
this
guarantee
from
asymptotic
to
nite-time.
Incorporating
fractional-order
calculus
[7]
into
the
sliding
surf
ace
has
pro
v
ed
a
particularly
producti
v
e
direction:
Pisano
et
al.
[8]
formulated
a
rigorous
sliding-mode
re
gulator
for
fractional-order
dynamics;
Matignon
[9]
established
the
underlying
stability
theory;
and
Y
in
et
al.
[10],
Xue
et
al.
[11],
and
Monje
et
al.
[12]
demonstrated
that
replacing
the
classical
inte
ger
-order
deri
v
ati
v
e
with
a
non-inte
ger
memory
operator
yields
measura
bly
better
tracking.
This
fractional-order
PD
sliding
mode
control
(FOPD-SMC)
approach
has
since
bee
n
e
xtended
to
po
wer
electronics,
where
W
ang
et
al.
[13]
and
Bennaoui
et
al.
[14]
reported
impro
v
ed
re
gulation
on
boost
and
dual-acti
v
e-bridge
con
v
erters.
Fuzzy
logic
control
(FLC),
introduced
by
Zadeh
[15]
and
Mamdani
[16]
and
later
systematized
by
Lee
[17],
Jang
[18],
Ross
[19],
P
assino
and
Y
urk
o
vich
[20],
and
Feng
[21],
of
fers
a
structurally
dif
ferent
approach:
by
encoding
e
xpert
kno
wledge
as
linguistic
if–then
rules
rather
than
an
analytical
plant
m
od
e
l,
it
inherently
smooths
the
control
action
across
the
entire
operating
range.
This
adv
antage
has
been
conrmed
across
di
v
erse
application
domains,
including
h
ybrid
po
wer
systems
[22],
induction
motor
dri
v
es
[23],
po
wer
system
stabilizers
[24],
and
doubly-fed
induction
generator
protection
[25].
Building
on
these
directions,
T
iw
ary
et
al.
[26]
proposed
a
super
-twisting
sliding-mode
re
gulator
for
dual-acti
v
e-bridge
con
v
erters,
Abdelrahem
et
al.
[27]
applied
a
predicti
v
e
sliding-mode
scheme
to
wind-turbine
generators,
and
Zhao
and
Guo
[28]
de
v
eloped
PID
design
guidelines
for
nonlinear
systems.
Despite
the
breadth
of
this
body
of
w
ork,
a
critical
question
remains
unanswered:
when
FOPD-SMC
and
FLC
are
tested
on
the
same
plant
and
dri
v
en
by
the
same
reference,
ho
w
lar
ge
is
the
quantitati
v
e
trade-of
f
between
their
tracking
precision
and
their
actuator
smoothness
?
Existing
studies
in
v
ariably
e
v
aluate
each
paradigm
in
isolation
on
application-specic
hardw
are,
so
an
y
cross-paradigm
inference
is
confounded
by
dif
ferences
in
plant
topology
,
operating
conditions,
and
e
v
aluation
criteria.
Practitioners
designing
a
v
oltage
re
gulator
or
dri
v
e
controller
therefore
lack
a
numerically
grounded
reference
from
which
to
read
of
f
the
accurac
y
cost
of
choosing
FLC
o
v
er
FOPD-SMC,
or
the
smoothness
penalty
of
the
re
v
erse
selection.
T
o
address
this
g
ap,
the
present
w
ork
mak
es
three
contrib
utions:
i)
Both
controllers
are
implemented
on
the
same
second-order
discrete-time
nonlinear
plant
whose
ARX
structure
emulates
the
input–output
dynamics
of
DC–DC
con
v
erter
lters
and
electric
motor
dri
v
es;
ii)
Both
are
e
v
aluated
under
a
composite
reference
combining
sinusoidally-modulated
ramps
with
step
transitions—spanning
the
speed-ramp
and
load-step
proles
of
real
dri
v
e
operation—and
scored
with
identical
ISE
and
IAE
metric
s;
and
iii)
The
measured
precision-v
ersus-smoothness
trade-of
f
is
translated
into
quantitati
v
e,
e
vidence-bas
ed
selection
guidelines
applicable
to
v
oltage
re
gulators,
DC–DC
con
v
erters,
and
v
ariable-speed
dri
v
e
systems.
2.
METHOD
2.1.
Resear
ch
design
The
study
is
a
controlled
simulation
e
xperiment
that
isolates
each
control
la
w
by
holding
e
v
ery
other
v
ariable
x
ed.
The
w
orko
w
is:
i)
Dene
a
second-order
discrete-time
nonlinear
plant
representati
v
e
of
con
v
erter/dri
v
e
dynamics;
ii)
Design
FOPD-SMC
and
FLC
with
documented
parameters
and
stability
properties;
iii)
Dri
v
e
both
closed
loops
with
an
identical
composite
reference;
and
i
v)
Ev
aluate
tracking
accurac
y
and
control
smoothness
via
ISE
and
IAE.
All
simulations
were
performed
in
Python
3.10
with
NumPy
and
scikit-fuzzy
.
Compar
ative
simulation
of
fr
actional-or
der
PD
sliding
mode
and
fuzzy
lo
gic
contr
oller
s
...
(Ahmed
Bennaoui)
Evaluation Warning : The document was created with Spire.PDF for Python.
1824
❒
ISSN:
2088-8694
2.2.
Plant
model
The
controlled
plant
is
a
second-order
discrete-time
system
described
by
(1).
y
[
i
]
=
0
.
7
y
[
i
−
1]
+
0
.
3
u
[
i
−
1]
+
0
.
05
u
[
i
−
2]
(1)
This
second-order
autore
gressi
v
e
with
eXogenous
inputs
(ARX)
structure
captures
tw
o
k
e
y
dynamic
characteristics
common
to
po
wer
electronic
and
dri
v
e
system
plants:
i)
The
autore
gressi
v
e
coef
cient
0
.
7
on
y
[
i
−
1]
represents
the
dominant
ener
gy-storage
pole
dynamics
typical
of
a
direct
current
(DC)–DC
con
v
erter
output
lter
(LC
netw
ork)
or
a
motor
winding
with
a
signicant
electrical
time
constant;
and
ii)
The
tw
o
input
terms
0
.
3
u
[
i
−
1]
+
0
.
05
u
[
i
−
2]
model
a
delayed,
distrib
uted
input-to-output
response
analogous
to
the
combined
ef
fects
of
pulse
width
modulation
(PWM)
switching
delays
and
electromagnetic
inertia
in
electric
dri
v
e
systems
[1],
[11].
The
presence
of
a
second-order
delayed-input
term
renders
the
control
design
non-tri
vial,
as
an
y
controller
must
account
for
the
additional
phase
lag
introduced
by
u
[
i
−
2]
.
This
benchmark
structure
follo
ws
t
he
approach
of
prior
comparati
v
e
controller
e
v
aluation
studies
[10],
[13]
and
pro
vides
a
common,
reproducible
basis
for
assessing
control
la
w
performance
independent
of
hardw
are-specic
con
v
erter
topologies.
The
composite
reference
signal
used
in
all
closed-loop
e
xperiments
consists
of
sinusoidally-modulated
triangular
ramps
concatenated
with
a
{
0
,
5
,
0
}
square-w
a
v
e
se
gment,
emulating
the
speed-ramp
proles
and
load-step
disturbances
encountered
in
real
dri
v
e
operation.
2.3.
Fractional-order
PD
sliding
mode
contr
oller
The
FOPD-SMC
replaces
the
classical
inte
ger
-order
error
deri
v
ati
v
e
in
the
sliding
surf
ace
with
a
Gr
¨
unw
ald–Letnik
o
v
(GL)
operator
of
non-inte
ger
order
α
,
injecting
a
weighted
his
tory
of
past
error
v
alues
into
the
surf
ace
computation
and
thereby
enriching
the
controller’
s
anticipatory
capability
[10],
[11],
[13].
The
tracking
error
is
(2).
e
[
i
]
=
y
[
i
]
−
r
[
i
+
1]
(2)
The
fractional-order
sliding
surf
ace
is
as
(3).
s
[
i
]
=
e
[
i
]
+
λD
α
e
[
i
]
(3)
Where
λ
=
2
.
0
and
α
=
0
.
5
.
The
GL
recursion
truncates
the
innite
binomial
series
at
M
past
samples,
producing
the
causal
nite-memory
approximation
used
at
each
step
i
.
D
α
e
[
i
]
≈
1
h
α
M
j
=0
(
−
1)
j
α
j
e
[
i
−
j
]
(4)
The
control
la
w
includes
equi
v
alent
control:
u
eq
[
i
]
=
−
p
q
(5)
where:
p
=
(1
+
λ
)
a
+
λF
i
+1
,
a
=
0
.
7
y
[
i
]
+
0
.
05
u
[
i
−
1]
−
r
[
i
+
2]
(6)
q
=
(1
+
λ
)0
.
3
(7)
F
i
+1
=
min(
M
,i
+1)
k
=1
(
−
1)
k
α
k
e
[
i
+
1
−
k
]
,
M
=
20
(8)
and
switching
control
(9).
u
sw
[
i
]
=
−
k
sw
sign(
s
[
i
])
,
k
sw
=
0
.
1
(9)
The
total
control
signal
is
(10).
u
[
i
]
=
u
eq
[
i
]
+
u
sw
[
i
]
(10)
Int
J
Po
w
Elec
&
Dri
Syst,
V
ol.
17,
No.
3,
September
2026:
1822–1830
Evaluation Warning : The document was created with Spire.PDF for Python.
Int
J
Po
w
Elec
&
Dri
Syst
ISSN:
2088-8694
❒
1825
Closed-loop
stability
is
v
eried
through
the
quadratic
L
yapuno
v
candidate
(11).
V
[
i
]
=
1
2
s
[
i
]
2
(11)
The
equi
v
alent
term
u
eq
is
deri
v
ed
to
annihilate
the
plant
dynamics
and
set
s
[
i
+
1]
=
0
on
the
nominal
trajectory;
the
discontinuous
term
u
sw
then
enforces
∆
V
[
i
]
<
0
for
all
s
[
i
]
̸
=
0
,
so
the
surf
ace
is
globally
attracti
v
e.
The
v
alue
k
sw
=
0
.
1
w
as
selected
to
bound
the
w
orst-case
residual
perturbation
while
holding
the
discontinuous
amplitude—and
the
resulting
chattering—within
acceptable
limits
[1],
[2].
2.4.
Fuzzy
logic
contr
oller
The
FLC
adopts
the
Mamdani
incremental
architecture
[16],
[17]:
the
instantaneous
tracking
error
e
[
i
]
=
y
[
i
]
−
r
[
i
+
1]
and
its
one-step
dif
ference
∆
e
[
i
]
=
e
[
i
]
−
e
[
i
−
1]
serv
e
as
linguistic
inputs,
while
∆
u
[
i
]
is
the
inferred
output
increment.
Each
input
is
encoded
by
three
Gaussian
membership
f
u
nc
tions
as
sho
w
in
Figures
1(a)
and
1(b)
and
the
output
by
v
e
triangular
labels
as
sho
ws
in
Figure
1(c).
The
nine-rule
base
as
sho
wn
in
T
able
1
embeds
the
heuristic
that
lar
ger
errors
or
f
aster
error
gro
wth
should
trigger
proportionally
lar
ger
correcti
v
e
increments.
The
crisp
control
signal
is
reconstructed
as
(12).
u
[
i
]
=
u
[
i
−
1]
+
Gain
·
∆
u
[
i
]
,
Gain
=
1
.
8
.
(12)
Membership
widths
(
σ
=
6
on
[
−
10
,
10]
for
inputs;
triangular
partitions
on
[
−
15
,
15]
for
the
output)
distrib
ute
the
linguistic
co
v
erage
e
v
enly
across
the
e
xpected
operating
range.
Rule
ring
strengths
are
aggre
g
ated
by
min-max
composition
[16],
[19],
[20]
and
the
crisp
increment
is
reco
v
ered
by
centre-of-gra
vity
defuzzication.
This
inte
grating
structure-accumulated
control
rather
than
di
rect
output-is
a
standard
strate
gy
in
FLC-based
dri
v
e
and
po
wer
-system
compensation
[22],
[23],
[25].
(a)
(b)
(c)
Figure
1.
Membership
functions
of
the
Mamdani
FLC:
(a)
error
,
(b)
error
deri
v
ati
v
e,
and
(c)
change
in
control
signal
Compar
ative
simulation
of
fr
actional-or
der
PD
sliding
mode
and
fuzzy
lo
gic
contr
oller
s
...
(Ahmed
Bennaoui)
Evaluation Warning : The document was created with Spire.PDF for Python.
1826
❒
ISSN:
2088-8694
T
able
1.
FLC
rule
base
e
\
∆
e
Ne
g
ati
v
e
Zero
Positi
v
e
Ne
g
ati
v
e
GP
P
Z
Zero
P
Z
N
Positi
v
e
Z
N
GN
Notes:
GP:
great
positi
v
e,
P:
positi
v
e,
Z:
zero
N:
ne
g
ati
v
e,
GN:
great
ne
g
ati
v
e
2.5.
Implementation
and
softwar
e
tools
Both
controllers
were
implemented
in
Python
3.10
using
NumPy
and
scikit-fuzzy
,
in
strictly
separate
closed
loops
sharing
only
the
plant
and
reference.
At
each
step
i
,
the
FOPD-SMC
e
v
aluates
the
Gr
¨
unw
ald–Letnik
o
v
deri
v
ati
v
e
(4)
(memory
depth
M
=
20
),
computes
the
sliding
surf
ace
(3),
and
applies
the
total
control
la
w
(10).
FLC
fuzzies
e
[
i
]
and
∆
e
[
i
]
,
e
v
aluates
the
nine
rules
via
Mamdani
min–max
inference,
and
applies
the
defuzzied
increment
through
(12).
ISE
and
IAE
are
computed
from
i
=
2
onw
ard
to
e
xclude
initialization
transients.
This
study
in
v
olv
es
only
numerical
simulation
and
requires
no
ethical
appro
v
als.
3.
RESUL
TS
AND
DISCUSSION
3.1.
Simulation
conditions
Both
controllers
were
simulated
on
plant
(1)
for
N
=
600
samples
(
T
s
=
1
,
zero
initial
conditions)
and
dri
v
en
by
the
same
composite
reference
(sinusoidally-modulated
ramp
follo
wed
by
a
{
0
,
5
,
0
}
square-w
a
v
e
se
gment).
T
racking
performance
w
as
quantied
by
(13).
ISE
=
1
N
−
2
N
−
1
i
=2
e
[
i
]
2
,
IAE
=
1
N
−
2
N
−
1
i
=2
|
e
[
i
]
|
(13)
Where
ISE
assigns
quadratic
weight
to
transient
e
xcursions
and
IAE
measures
the
mean
absolute
de
viation
o
v
er
the
full
simulation
horizon.
3.2.
Pr
esentation
of
r
esults
T
able
2
reports
quantitati
v
e
performance
under
identical
conditions.
FOPD-SMC
achie
v
es
an
ISE
of
1
.
639
×
10
−
2
and
an
IAE
of
3
.
345
×
10
−
2
,
while
FLC
yields
an
ISE
of
1
.
323
×
10
−
1
and
an
IAE
of
6
.
742
×
10
−
2
.
Figure
2
presents
on
same
time
axis,
Figure
2(a)
sho
w
reference
and
both
outputs,
Figure
2(b)
sho
w
tracking
errors,
and
Figure
2(c)
sho
w
control
signals.
Figure
3
sho
ws
FOPD-SMC
sliding
surf
ace
s
[
i
]
.
3.3.
Analysis
and
inter
pr
etation
The
measured
reductions
of
87.6%
in
ISE
and
50.4%
in
IAE
establish
a
consistent
and
reproducible
tracking
adv
antage
for
FOPD-SMC
o
v
er
FLC.
T
ranslating
the
IAE
v
alues
into
per
-sample
terms:
FOPD-SMC
a
v
erages
an
absolute
de
viation
of
≈
0
.
033
per
sample
ag
ainst
≈
0
.
067
for
FLC,
so
FLC’
s
typical
pointwise
error
is
double
that
of
its
fractional-order
counterpart
across
the
entire
600-sample
run.
The
ISE
ratio
of
8
.
07
signals
that
FLC
generates
pronounced
transient
o
v
ershoots
at
reference
step
transitions—spik
es
that
the
quadratic
metric
amplies
disproportionately—as
conrmed
by
the
delayed
output
response
visible
in
Figure
2(a),
where
FLC
peak
de
viations
reach
3–4
times
the
FOPD-SMC
le
v
el
during
abrupt
changes.
T
w
o
structural
propert
ies
account
for
FOPD-SMC’
s
superior
performance.
First,
setting
α
=
0
.
5
in
(3)
gi
v
es
s
[
i
]
access
to
a
decaying-weight
history
of
past
errors:
the
GL
operator
assigns
lar
ger
coef
cients
to
recent
samples
and
progressi
v
ely
smal
ler
ones
to
older
samples,
so
the
surf
ace
responds
to
error
trends
that
a
purely
instantaneous
deri
v
ati
v
e
w
ould
miss.
Second,
the
control
signal
is
constructed
in
tw
o
functionally
separate
part
s—
u
eq
handles
the
nominal
plant
trajectory
while
u
sw
pro
vides
a
hard
rob
ustness
mar
gin
ag
ainst
model
residuals—so
the
tw
o
requirements
ne
v
er
compete.
Figure
3
pro
vides
direct
e
vidence
of
this
design:
s
[
i
]
f
alls
sharply
to
zero
within
the
rst
fe
w
dozen
samples
and
subsequently
remains
conned
to
a
narro
w
corridor
,
conrming
that
the
controller
reaches
and
sustains
sliding-mode
operation
throughout
the
full
run.
The
precision
g
ain
carries
a
visible
cost
i
n
Figure
2(b):
the
hard
relay
nonlinearity
sign(
·
)
in
u
sw
forces
rapid
amplitude
transitions
around
the
sliding
manifold,
e
xciting
unmodeled
high-frequenc
y
plant
dynamics
and
producing
the
characteristic
oscillatory
artif
act
that
must
be
addressed
in
hardw
are
realizations
through
boundary-layer
replacement
or
higher
-order
SMC
schemes
[1],
[2].
FLC,
by
contrast,
maps
its
inputs
through
smooth
Gaussian
functions
and
aggre
g
ates
nine
rules
by
min-max
composition,
so
the
control
increment
v
aries
Int
J
Po
w
Elec
&
Dri
Syst,
V
ol.
17,
No.
3,
September
2026:
1822–1830
Evaluation Warning : The document was created with Spire.PDF for Python.
Int
J
Po
w
Elec
&
Dri
Syst
ISSN:
2088-8694
❒
1827
continuously
with
the
error
state;
this
structural
smoothness
eliminates
rapid
switching
at
the
cost
of
the
3–4
×
lar
ger
peak
de
viations
observ
ed
in
Figure
2(b)
during
abrupt
reference
changes.
These
observ
ations
mak
e
the
precision-v
ersus-smoothness
trade-of
f
directly
measurable
on
a
common
benchmark
rather
than
inferred
across
heterogeneous
application
studies.
T
able
2.
Performance
comparison
Controller
ISE
IAE
FOPD-SMC
1
.
639
×
10
−
2
3
.
345
×
10
−
2
FLC
1
.
323
×
10
−
1
6
.
742
×
10
−
2
Figure
2.
FOPD-SMC
v
ersus
FLC
on
a
common
time
axis:
(a)
reference
and
closed-loop
outputs,
(b)
tracking
errors,
and
(c)
control
signals
Figure
3.
FOPD-SMC
sliding
surf
ace
s
[
i
]
,
conrming
that
the
sliding
mode
is
reached
and
maintained
throughout
the
simulation
horizon
Compar
ative
simulation
of
fr
actional-or
der
PD
sliding
mode
and
fuzzy
lo
gic
contr
oller
s
...
(Ahmed
Bennaoui)
Evaluation Warning : The document was created with Spire.PDF for Python.
1828
❒
ISSN:
2088-8694
4.
CONCLUSION
This
paper
presented
a
controlled,
cross-paradigm
benchmarking
of
FOPD-SMC
and
Mamdani
FLC
on
a
common
second-order
discrete-time
nonlinear
plant
under
identical
reference,
initial
conditions,
and
performance
metrics.
By
remo
ving
the
application-specic
confounds
present
in
prior
studies—which
typically
e
v
aluate
a
single
controller
on
one
particular
con
v
erter
or
dri
v
e
topology—the
e
xperiment
yields
the
rst
directly
comparable
ISE/IAE
measurements
for
these
tw
o
control
f
amilies
under
a
common
e
v
aluation
protocol.
FOPD-SMC
outperforms
FLC
with
ISE
=
1
.
639
×
10
−
2
and
IAE
=
3
.
345
×
10
−
2
,
corresponding
to
reductions
of
87.6%
and
50.4%,
respecti
v
ely
,
o
v
er
FLC
(ISE
=
1
.
323
×
10
−
1
,
IAE
=
6
.
742
×
10
−
2
).
The
performance
adv
antage
stems
from
tw
o
cooperati
ng
mechanisms:
the
Gr
¨
unw
ald–Letnik
o
v
fractional-order
deri
v
ati
v
e
embedded
in
the
sliding
surf
ace
introduces
an
error
-history
memory
that
anticipates
reference
changes
ea
rlier
than
inte
ger
-order
designs,
while
e
xplicit
decomposition
of
the
control
la
w
int
o
equi
v
alent
and
switching
components
ensures
simultaneous
nominal
tracking
and
rob
ustness
to
plant
uncertainty
.
FLC,
although
8.07
×
less
precise
in
ISE,
inherently
suppresses
chattering
through
smooth
rule-based
inference,
rendering
it
the
preferred
option
in
applications
where
actuator
smoothness
and
reduced
mechanical
wear
are
paramount.
The
study
is
subject
to
t
h
r
ee
main
limitations:
only
a
single
second-order
plant
structure
is
e
v
aluated;
measurement
noise,
actuator
saturation,
and
parametric
uncertainty
are
not
modeled;
and
the
computational
b
urden
of
the
Gr
¨
unw
ald–Letnik
o
v
recursion
relati
v
e
to
FLC
infer
ence
is
not
formally
proled.
Future
w
ork
will
e
xtend
the
benchmark
to
e
xperimental
v
alidation
on
a
DC–DC
con
v
erter
and
a
motor
-dri
v
e
testbed,
in
v
estig
ate
a
h
ybrid
architecture
in
which
FLC
adapti
v
ely
tunes
the
FOPD-SMC
parameters
(
λ
,
k
sw
)
in
real
time
to
combine
high
precision
with
chattering-free
actuation,
and
assess
performance
on
higher
-order
plants
and
multi-input
multi-output
dri
v
e
congurations.
A
CKNO
WLEDGEMENTS
The
authors
e
xtend
their
appreciation
to
Umm
Al-Qura
Uni
v
ersity
,
Saudi
Arabia
for
funding
this
research
w
ork
through
grant
number:
26UQ
U4320283GSSR02.
FUNDING
INFORMA
TION
Funded
by
Umm
Al-Qura
Uni
v
ersity
,
Saudi
Arabia,
grant
number:
26UQ
U4320283GSSR02.
A
UTHOR
CONTRIB
UTIONS
ST
A
TEMENT
This
journal
uses
the
Contrib
utor
Roles
T
axonomy
(CRediT)
to
recognize
indi
vidual
author
contrib
utions,
reduce
authorship
disputes,
and
f
acilitate
collaboration.
Name
of
A
uthor
C
M
So
V
a
F
o
I
R
D
O
E
V
i
Su
P
Fu
Ahmed
Bennaoui
✓
✓
✓
✓
✓
✓
Salah
Benzian
✓
✓
✓
Hamza
Sulimani
✓
✓
✓
✓
Aissa
Ameur
✓
✓
✓
C
:
C
onceptualization
I
:
I
n
v
estig
ation
V
i
:
V
i
sualization
M
:
M
ethodology
R
:
R
esources
Su
:
Su
pervision
So
:
So
ftw
are
D
:
D
ata
Curation
P
:
P
roject
Administrati
on
V
a
:
V
a
lidation
O
:
Writing
-
O
riginal
Draft
Fu
:
Fu
nding
Acquisition
F
o
:
F
o
rmal
Analysis
E
:
Writing
-
Re
vie
w
&
E
diting
CONFLICT
OF
INTEREST
ST
A
TEMENT
The
authors
declare
no
conict
of
interest.
Int
J
Po
w
Elec
&
Dri
Syst,
V
ol.
17,
No.
3,
September
2026:
1822–1830
Evaluation Warning : The document was created with Spire.PDF for Python.
Int
J
Po
w
Elec
&
Dri
Syst
ISSN:
2088-8694
❒
1829
D
A
T
A
A
V
AILABILITY
Data
are
a
v
ailable
from
the
corresponding
author
upon
reasonable
request.
REFERENCES
[1]
V
.
I.
Utkin,
“Sliding
mode
control
design
principles
and
applications
to
electric
dri
v
es,
”
IEEE
T
r
ansactions
on
Industrial
Electr
onics
,
v
ol.
40,
no.
1,
pp.
23–36,
Feb
.
1993,
doi:
10.1109/41.184818.
[2]
C.
Edw
ards
and
S.
K
.
Spur
geon,
Sliding
mode
contr
ol:
theory
and
applications.
London
.
London,
UK:
T
aylor
&
Francis,
1998.
[3]
J.
V
iola,
L.
Angel,
and
J.
M.
Design
and
rob
ust
performance
e
v
aluation
of
a
fractional
order
PID
controller
applied
to
a
DC
motor
,
”
IEEE/CAA
J
ournal
of
A
utomatica
Sinica
,
v
ol.
4,
no.
2,
pp.
304–314,
Apr
.
2017,
doi:
10.1109/J
AS.2017.7510535.
[4]
X.
Y
u
and
M.
Zhihong,
F
ast
terminal
sliding-mode
control
design
for
nonlinear
dynamical
systems,
”
IEEE
T
r
ansactions
on
Cir
cuits
and
Systems
I:
Fundamental
Theory
and
Applications
,
v
ol.
49,
no.
2,
pp.
261–264,
2002,
doi:
10.1109/81.983876.
[5]
L.
Y
ang
and
J.
Y
ang,
“Nonsingular
f
ast
terminal
sliding-mode
control
for
nonlinear
dynamical
systems,
”
International
J
ournal
of
Rob
ust
and
Nonlinear
Contr
ol
,
v
ol.
21,
no.
16,
pp.
1865–1879,
No
v
.
2011,
doi:
10.1002/rnc.1666.
[6]
S.
Y
u,
X.
Y
u,
and
M.
Zhihong,
“Rob
ust
global
terminal
sliding
mode
control
of
siso
nonlinear
uncertain
systems,
”
Pr
oceedings
of
the
39th
IEEE
Confer
ence
on
Decision
and
Contr
ol
(Cat.
No.00CH37187)
,
IEEE,
pp.
2198–2203.
doi:
10.1109/CDC.2000.914122.
[7]
I.
Podlubn
y
,
“Fractional
dif
ferential
e
quations,
”
in
Mathematics
in
Science
and
Engineering
,
San
Die
go,
CA,
USA:
Academic
Press,
1999.
[8]
A.
Pisano,
M.
R.
Rapai
´
c,
Z.
D.
Jeli
ˇ
ci
´
c,
and
E.
Usai,
“Sliding
mode
control
approaches
to
the
rob
ust
re
gulation
of
linear
multi
v
ariable
fractional-order
dynamics,
”
International
J
ournal
of
Rob
ust
and
Nonlinear
Contr
ol
,
v
ol.
20,
no.
18,
pp.
2045–2056,
Dec.
2010,
doi:
10.1002/rnc.1565.
[9]
D.
Matignon,
“Stability
results
for
fractional
dif
ferential
equations
with
applications
to
control
processing,
”
Computational
engineering
in
systems
applications
,
pp.
963–968,
1996.
[10]
C.
Y
in,
Y
.
Chen,
and
S.
Zhong,
“Fractional-order
sliding
mode
based
e
xtremum
seeking
control
of
a
class
of
nonlinear
systems,
”
A
utomatica
,
v
ol.
50,
no.
12,
pp.
3173–3181,
Dec.
2014,
doi:
10.1016/j.automatica.2014.10.027.
[11]
D.
Xue,
C.
Zhao,
and
Y
.
Chen,
“Fractional
order
PID
control
of
a
DC-motor
with
elastic
shaft:
a
case
study
,
”
in
2006
American
Contr
ol
Confer
ence
,
IEEE,
2006,
p.
6
pp.
doi:
10.1109/A
CC.2006.1657207.
[12]
C.
A.
Monje,
Y
.
Chen,
B.
M.
V
inagre,
D.
Xue,
and
V
.
Feliu,
F
r
actional-or
der
s
ystems
and
contr
ols
.
in
Adv
ances
in
Industrial
Control.
London:
Springer
London,
2010.
doi:
10.1007/978-1-84996-335-0.
[13]
J.
W
ang,
D.
Xu,
H.
Zhou,
and
T
.
Zhou,
“
Adapti
v
e
fractional
order
sliding
mode
control
for
boost
con
v
erter
in
the
battery/supercapacitor
HESS,
”
PLOS
ONE
,
v
ol.
13,
no.
4,
p.
e0196501,
Apr
.
2018,
doi:
10.1371/journal.pone.0196501.
[14]
A.
Bennaoui,
S.
Benzian,
I.
N.
Alsolbi,
and
A.
Ameur
,
“Comparati
v
e
analysis
of
fractional
-order
sliding
mode
and
pole
placement
control
for
robotic
manipulator
,
”
Indonesian
J
ournal
of
Electrical
Engineering
and
Computer
Science
,
v
ol.
41,
no.
1,
p.
90,
Jan.
2026,
doi:
10.11591/ijeecs.v41.i1.pp90-98.
[15]
L.
A.
Zade
h,
“Fuzzy
sets,
”
Information
and
Contr
ol
,
v
ol.
8,
no.
3,
pp.
338–353,
Jun.
1965,
doi:
10.1016/S0019-9958(65)90241-X.
[16]
E.
H.
Mamdani,
“
Application
of
fuzzy
algorithms
for
control
of
simple
dynamic
plant,
”
Pr
oceedings
of
the
Institution
of
Electrical
Engineer
s
,
v
ol.
121,
no.
12,
p.
1585,
1974,
doi:
10.1049/piee.1974.0328.
[17]
C
.
C.
Lee,
“Fuzzy
logic
in
control
systems:
fuzzy
logic
controll
er
.
I,
”
IEEE
T
r
ansactions
on
Systems,
Man,
and
Cybernetics
,
v
ol.
20,
no.
2,
pp.
404–418,
1990,
doi:
10.1109/21.52551.
[18]
J
.-S.
R.
Jang,
“
ANFIS:
adapti
v
e-netw
ork-based
fuzzy
inference
system,
”
IEEE
T
r
ansactions
on
Systems,
Man,
and
Cybernetics
,
v
ol.
23,
no.
3,
pp.
665–685,
1993,
doi:
10.1109/21.256541.
[19]
T
.
J
.
Ross,
Fuzzy
lo
gic
with
engineering
applications
,
4th
ed.
Chichester
,
UK:
John
W
ile
y
&
Sons,
2017.
[20]
K.
M
.
P
assino
and
S.
Y
urk
o
vich,
Fuzzy
contr
ol
.
Menlo
P
ark,
CA,
USA:
Addison-W
esle
y
,
1998.
[21]
G.
Feng,
“
A
surv
e
y
on
analysis
and
design
of
model-based
fuzzy
control
systems,
”
IEEE
T
r
ansactions
on
Fuzzy
Systems
,
v
ol.
14,
no.
5,
pp.
676–697,
Oct.
2006,
doi:
10.1109/TFUZZ.2006.883415.
[22]
K
.
N.
Khallouf,
H.
Benbouhenni,
and
N.
Bizon,
“Boosting
ener
gy
quality
in
h
ybrid
po
wer
systems
t
hrough
fractional-order
adapti
v
e
fuzzy
logic–based
direct
po
wer
control
of
SAPF
,
”
Algorithms
,
v
ol.
19,
no.
5,
p.
418,
May
2026,
doi:
10.3390/a19050418.
[23]
Y
.-S
.
Lai
and
J.-C.
Lin,
“Ne
w
h
ybrid
fuzzy
controller
for
direct
torque
control
induction
motor
dri
v
es,
”
IEEE
T
r
ansactions
on
P
ower
Electr
onics
,
v
ol.
18,
no.
5,
pp.
1211–1219,
Sep.
2003,
doi:
10.1109/TPEL.2003.816193.
[24]
L.
Chai
b,
A.
Choucha,
and
S.
Arif,
“Optimal
design
and
tuning
of
no
v
el
fractional
order
pid
po
wer
system
stabilizer
using
a
ne
w
metaheuristic
bat
algorithm,
”
Ain
Shams
Engineering
J
ournal
,
v
ol.
8,
no.
2,
pp.
113–125,
Jun.
2017,
doi:
10.1016/j.asej.2015.08.003.
[25]
O.
Noureldeen
and
I.
Ha
mdan,
“
A
no
v
el
controllable
cro
wbar
based
on
f
ault
type
protection
technique
for
DFIG
wind
ener
gy
con
v
ersion
system
using
adapti
v
e
neuro-fuz
zy
inference
system,
”
Pr
otection
and
Contr
ol
of
Modern
P
ower
Systems
,
v
ol.
3,
no.
1,
p.
35,
Dec.
2018,
doi:
10.1186/s41601-018-0106-0.
[26]
N.
T
iw
ary
,
V
.
Naik
N,
A.
K.
P
anda,
A.
Narendra,
and
R.
K.
Lenka,
“
A
rob
ust
v
oltage
control
of
D
AB
con
v
erter
with
super
-twisting
sliding
mode
approach,
”
IEEE
J
ournal
of
Emer
ging
and
Selected
T
opics
in
Industrial
Electr
onics
,
v
ol.
4,
no.
1,
pp.
288–298,
Jan.
2023,
doi:
10.1109/JESTIE.2022.3227007.
[27]
M.
Abdelrahem,
C.
Hackl,
and
R.
K
ennel,
“Rob
ust
predicti
v
e
control
scheme
for
permanent-m
agnet
synchronous
generators
based
modern
wind
turbines,
”
Electr
onics
,
v
ol.
10,
no.
13,
p.
1596,
Jul.
2021,
doi:
10.3390/electronics10131596.
[28]
C.
Zhao
and
L.
Guo,
“PID
controller
design
for
second
order
nonlinear
uncertain
systems,
”
Science
China
Information
Sciences
,
v
ol.
60,
no.
2,
p.
022201,
Feb
.
2017,
doi:
10.1007/s11432-016-0879-3.
Compar
ative
simulation
of
fr
actional-or
der
PD
sliding
mode
and
fuzzy
lo
gic
contr
oller
s
...
(Ahmed
Bennaoui)
Evaluation Warning : The document was created with Spire.PDF for Python.
1830
❒
ISSN:
2088-8694
BIOGRAPHIES
OF
A
UTHORS
Ahmed
Bennaoui
recei
v
ed
hi
s
B.Sc.
i
n
electronics
engineering
from
the
Uni
v
ersity
of
Mohamed
Boudiaf
(M’
sila,
2011),
M
.Sc.
de
grees
in
electrical
engineering
(adv
anced
automation)
from
the
Uni
v
ersity
of
Ziane
Achour
(Djelf
a,
2012
and
2016),
and
a
Ph.D.
in
electrical
engineering
(intelligent
control
and
automation,
2024)
from
the
Uni
v
ersity
of
Amar
T
elidji
(Laghouat),
Algeria.
He
is
currently
with
the
Institute
of
Sciences,
Uni
v
ersity
Center
Aou
El
Cherif
Bouchoucha.
His
re
search
interests
inc
lude
nonlinear
dynamics,
fuzzy
logic
control,
po
wer
system
control,
and
optimization
techniques.
In
this
study
,
he
led
the
design
and
simulation
of
the
FOPD-SMC
and
the
analysis
of
control
strate
gies
for
nonlinear
systems.
He
can
be
contacted
at
email:
a.bennaoui@cu-aou.edu.dz.
Salah
Benzian
recei
v
ed
his
B.Sc.
from
the
Uni
v
ersity
of
M’hamed
Boug
ara,
Boumerdes,
Algeria,
his
M.Sc.
from
the
Uni
v
ersity
of
Ziane
Achour
,
Djelf
a,
Algeria,
and
his
Ph.D.
from
the
Uni
v
ersity
of
Amar
T
elidji,
Laghouat,
Algeria.
He
is
currently
with
the
Institute
of
Sciences,
Uni
v
ersity
Center
Aou
El
Cherif
Bouchoucha,
Aou,
Algeria.
His
research
interests
include
fuzzy
control,
po
wer
systems,
and
optimization.
In
this
study
,
he
contrib
uted
to
the
controller
design,
the
analysis
of
simulation
results,
and
the
preparation
of
the
manuscript.
He
can
be
contacted
at
email:
s.benzian@cu-aou.edu.dz.
Hamza
Sulimani
is
an
assistant
professor
in
the
Department
of
Computer
and
Netw
ork
Engineering,
Colle
ge
of
Computing,
Umm
Al-Qura
Uni
v
ersity
,
Makkah,
Saudi
Arabia.
He
recei
v
ed
his
B.S.
de
gree
in
electrical
and
computer
Engineering
from
Umm
Al-Qura
Uni
v
ersity
(2000),
his
M.S.
de
gree
in
electric
al
and
computer
engineering
from
King
Abdulaziz
Uni
v
ersity
(2010),
and
his
Ph.D.
de
gree
in
inf
ormation
technology
from
the
Uni
v
ersity
of
T
echnology
Sydne
y
(UTS
),
Australia
(2024).
His
current
research
interests
include
computer
netw
ork
architectures,
c
ybersecurity
,
fog
computing
for
IoT
protection,
and
machine
learning
applications
in
netw
ork
traf
c
analysis.
He
can
be
contacted
at
email:
hhhsulimani@uqu.edu.sa.
Aissa
Ameur
recei
v
ed
his
master’
s
and
Ph.D.
de
grees
in
electrical
engineering
from
Batna
Uni
v
ersity
,
Algeria,
in
2005
and
2012,
respecti
v
ely
.
Since
2005,
he
has
been
with
the
F
aculty
of
T
echnology
,
Uni
v
ersity
of
Amar
T
elidji
(Laghouat),
where
he
is
an
assistant
professor
and
a
researcher
at
the
LeDMaScD
laboratory
.
His
research
interests
include
modeling
of
electrical
machines,
e
lectrical
dri
v
e
control,
f
ault
di
agnosis,
articial
intelligence,
and
rene
w
able
ener
gy
systems.
In
this
study
,
he
de
v
eloped
the
FLC,
conducted
the
result
analysis,
and
contrib
uted
to
the
manuscript
preparation.
He
can
be
contacted
at
email:
a.ameur@lagh-uni
v
.dz.
Int
J
Po
w
Elec
&
Dri
Syst,
V
ol.
17,
No.
3,
September
2026:
1822–1830
Evaluation Warning : The document was created with Spire.PDF for Python.