Internati
o
nal
Journal of P
o
wer Elect
roni
cs an
d
Drive
S
y
ste
m
(I
JPE
D
S)
V
o
l.
7, N
o
. 1
,
Mar
c
h
20
16
,
pp
. 1
~
6
I
S
SN
: 208
8-8
6
9
4
1
Jo
urn
a
l
h
o
me
pa
ge
: h
ttp
://iaesjo
u
r
na
l.com/
o
n
lin
e/ind
e
x.ph
p
/
IJPEDS
Experimental Investigations of
the Self-Controlled Synchronous
Mot
o
r Connected
to a Three-
Phase Line Commutated SCR
Invert
er
Ta
p
a
n
K
u
ma
r
C
h
a
k
ra
bo
r
t
y
Department o
f
Electrical and Co
mputer Engi
n
eer
ing, P
r
es
id
enc
y
Univers
i
t
y
,
Ban
g
lades
h
Article Info
A
B
STRAC
T
Article histo
r
y:
Received Aug 12, 2015
Rev
i
sed
O
c
t 11
, 20
15
Accepte
d Nov 2, 2015
This paper con
c
erns the exper
imental
invest
iga
tions of the thre
e-phase lin
e
commutated SCR inverter f
e
d
s
y
nchronous
motor. Th
e fabricated s
y
stem
consists of a line-commuted inverter
,
a three-ph
ase s
y
nchronous
motor with
the excitation winding connected in series
to the inverter input, a terminal
voltag
e
sensor and a gate-pulse
genera
ting
circu
i
t. Th
e fir
i
ng puls
e
s for SCRs
of the inver
t
er
are gener
a
ted b
y
the microprocessor in proper sequence with
the h
e
lp of
s
y
n
c
hronizing sign
al deriv
e
d from the terminal vo
ltages of
the
s
y
nchronous machin
e.
The stead
y
st
ate p
e
rfo
rmance ch
aracteristics ar
e
obtain
e
d exp
e
rimentally
using
the fa
bri
c
a
t
ed
s
y
s
t
em
.
Th
e
experim
e
nt
al
results show th
at
a thr
ee-ph
ase s
y
n
c
hronous
motor supplied
b
y
a lin
e
commutated inv
e
rter
with
the
ex
citation wind
ing
connected
in series to th
e d
c
link prov
ide
ex
c
e
ll
ent
char
act
eris
tics
of
th
e conv
e
n
tional
dc
s
e
ri
es
m
o
tor.
Keyword:
C
onst
a
nt
del
a
y
an
gl
e
Firin
g
circ
uit
Li
ne-c
om
m
u
t
a
t
e
d i
n
vert
e
r
Syn
c
hro
nou
s m
o
to
r
Vol
t
a
ge
se
nso
r
Copyright ©
201
6 Institut
e
o
f
Ad
vanced
Engin
eer
ing and S
c
i
e
nce.
All rights re
se
rve
d
.
Co
rresp
ond
i
ng
Autho
r
:
Tapa
n
Kum
a
r C
h
ak
rab
o
r
t
y
Depa
rtem
ent of Electrical a
nd Co
m
p
u
t
er
Engin
eer
ing
,
Preside
n
cy Uni
v
ersity,
10
Kem
a
l
At
at
ur
k
Av
en
ue,
B
a
nani
,
D
h
a
k
a-
1
2
1
3
,
B
a
n
g
l
a
de
sh.
Em
a
il: ch
ak
@mail.p
r
esid
en
cy.ed
u
.bd
1.
INTRODUCTION
M
a
ny
m
oder
n
i
n
d
u
st
ri
al
ap
pl
i
cat
i
ons
need
v
a
ri
abl
e
spee
d
m
o
t
o
rs wi
t
h
a
preci
se a
nd sm
oot
h co
nt
r
o
l
of s
p
eed
with long term
stability and good tra
n
sien
t perform
a
nce [1]. From
the very begi
nni
ng, the
con
v
e
n
t
i
onal
dc m
o
t
o
rs ha
ve bee
n
use
d
as vari
a
b
l
e
s
p
eed
d
r
i
v
es i
n
m
a
ny
i
ndus
t
r
i
a
l
appl
i
cat
i
ons [
2
]
.
Ho
we
ver
,
f
o
r r
e
l
i
a
bl
e ope
rat
i
on
of t
h
e sy
st
em
,
t
h
e dc m
o
tor
dri
v
es are
n
o
t
ad
vi
sabl
e i
n
m
a
ny
cases due t
h
e
dra
w
backs
,
s
u
ch as, m
echani
cal comm
ut
at
or
nee
d
s reg
u
l
a
r
m
a
i
n
t
e
nance, po
we
r/
wei
g
ht
rat
i
o
re
d
u
ces d
u
e
t
o
t
h
e ad
di
t
i
onal
wei
g
ht
of c
o
m
m
ut
at
or, b
r
ush
and c
o
m
m
ut
at
or wea
r
occ
u
r
s
due t
o
fri
ct
i
on a
n
d spa
r
ki
n
g
, t
h
e
comm
utator construction inc
r
eases the cost of the dc m
o
t
o
r dri
v
e, an
d u
n
s
ui
t
a
bl
e t
o
ope
r
ate in expl
osive and
dust
y
e
n
vi
ro
n
m
ent
s
.
Th
e silicon
-con
tro
lled
-
rectifier (SCR)
b
a
sed
inv
e
rter
is
no
w u
s
ed
t
o
con
t
ro
l th
e sp
eed o
f
ind
u
c
tion
and sy
nc
hr
on
o
u
s m
o
t
o
rs.
In
o
r
de
r t
o
obt
ai
n
r
e
l
i
a
bl
e cont
r
o
l
of t
h
e SC
R
-
bas
e
d p
o
w
er c
o
n
v
e
rt
er, a sy
nch
r
on
o
u
s
firin
g
co
ntr
o
l schem
e
is necessary
fo
r its SCRs ove
r a wi
de ra
n
g
e of
ac sup
p
l
y
fre
que
nci
e
s [
2
]
.
Loa
d
co
mm
u
t
ated
in
v
e
rter fed
sy
n
c
h
r
on
ou
s m
o
to
r
with
its excitatio
n
wind
ing
con
n
ected
in seri
es to
th
e inp
u
t
o
f
t
h
e
i
nve
rt
er can b
e
used m
o
st
econ
om
i
cal
ly
as vari
abl
e
spee
d dri
v
es i
n
pl
a
ce of co
nve
nt
i
onal
dc m
o
t
o
r
dri
v
e
s
ove
r a
wi
de
ra
nge
o
f
s
p
ee
d [
3
]
-
[
1
0]
. Th
e p
o
we
r ci
rc
ui
t
an
d t
r
i
gge
ri
n
g
ci
r
c
ui
t
[
11]
f
o
r S
C
R
s
of
t
h
e i
n
v
e
rt
er
a
r
e
v
e
ry sim
p
le in
stru
cture.
Forced comm
utated inverters have
been
widely used as variable
freque
n
c
y
source for speed control
of sy
nc
h
r
o
n
o
u
s
m
achi
n
es. H
o
we
ve
r, t
h
i
s
s
c
hem
e
need
s com
p
licated powe
r
and cont
rol circ
uits [3]
.
As a
resu
lt of av
ailab
ility o
f
i
m
p
r
ov
ed
vo
ltag
e
and
curren
t
rating
SCR and
with
th
eir
prices co
m
i
n
g
d
o
wn
,
peo
p
l
e
h
a
v
e
sh
own
con
s
id
erab
le in
terest in
syn
c
hron
ou
s typ
e
m
a
c
h
in
es in
stead
of co
nv
en
tion
a
l d
c
m
o
to
r fo
r
variab
le
Evaluation Warning : The document was created with Spire.PDF for Python.
I
S
SN
:
2
088
-86
94
I
J
PED
S
Vo
l. 7,
No
.
1,
Mar
c
h
2
016
:
1
–
6
2
spee
d
dri
v
e
s
.
Li
ne c
o
m
m
ut
at
ed i
n
vert
er
o
v
e
rcom
es al
l
the problem
s
of
forced co
mm
utated inve
rters
as well
as cy
cl
oco
nve
rt
ers.
Al
m
o
st
al
l
research
w
o
r
k
s
were
pe
r
f
o
r
m
e
d usi
n
g
rot
o
r
-
spee
d se
nso
r
fo
r
gene
r
a
t
i
n
g
trig
g
e
ring
pu
lses for SCRs of th
e in
verter
[12
]
-[16
]. Th
e h
a
rd
ware imp
l
em
en
tatio
n
o
f
th
e
ro
t
o
r-po
sitio
n
sens
or is
ve
ry
com
p
licated.
In t
h
i
s
w
o
rk
,
t
h
e ex
pe
ri
m
e
nt
al
i
nvest
i
g
at
i
ons
ha
ve bee
n
car
ri
ed o
u
t
t
o
study the s
t
eady state
p
e
rf
or
m
a
n
ce ch
ar
acter
istics of
a SCR in
v
e
r
t
er
f
e
d
thr
e
e-
phase syn
c
hr
onou
s m
o
to
r
w
ith
th
e h
e
lp
o
f
vo
l
t
ag
e
sens
or
i
n
st
ead
of
spee
d sens
o
r
.
2.
SYSTE
M
DESC
RIPTIO
N AN
D OPER
A
T
ION
The bl
o
c
k di
a
g
ram
of t
h
e sy
st
em
used fo
r expe
ri
m
e
nt
al
inve
st
i
g
at
i
ons i
s
sho
w
n i
n
Fi
gu
re 1. T
h
e
sy
st
em
basi
cal
ly
consi
s
t
s
o
f
a
t
h
ree-
p
h
ase au
t
o
t
r
ans
f
orm
e
r, an u
n
c
ont
rol
l
e
d t
h
ree
-
pha
se bri
dge
rect
i
f
i
e
r
,
a dc
l
i
nk sm
oot
hi
n
g
i
n
d
u
ct
o
r
, a
t
h
ree
-
p
h
ase
l
i
n
e com
m
ut
at
ed SC
R
i
n
vert
er
,
a t
h
ree-
pha
se
sy
nc
hr
on
o
u
s
m
o
t
o
r,
sy
nch
r
o
n
i
z
i
n
g ci
rcui
t
and a
m
i
cropr
ocess
o
r-
base
d fi
ri
n
g
ci
rcui
t
.
The t
h
ree-
pha
se aut
o
t
r
ans
f
o
r
m
e
r provi
de
s
vari
a
b
l
e
ac i
n
p
u
t
vol
t
a
ge
t
o
t
h
e
u
n
co
nt
r
o
l
l
e
d
bri
dge
rect
i
f
i
e
r t
o
pr
od
uce
vari
a
b
l
e
dc
out
put
v
o
l
t
a
ge.
T
h
i
s
dc
so
ur
ce su
pp
lies activ
e p
o
w
e
r r
e
qu
ir
ed
f
o
r
th
e syn
c
h
r
o
nous
m
o
to
r
.
Th
e fu
n
c
tion
o
f
th
e
d
c
lin
k
indu
cto
r
is t
o
sup
p
r
ess t
h
e
h
a
rm
oni
cs co
nt
ai
ned i
n
t
h
e
o
u
t
put
of t
h
e b
r
i
dge
rect
i
f
i
e
r
.
T
h
e c
o
m
b
i
n
at
i
on o
f
t
h
e
u
n
c
o
n
t
rol
l
e
d
rectifier an
d d
c
lin
k
i
n
du
ct
o
r
acts as a
cu
rr
en
t sou
r
ce fo
r th
e SCR inv
e
r
t
er.
Fi
gu
re
1.
B
l
oc
k
di
ag
ram
of t
h
e SC
R
i
n
vert
er
fe
d t
h
ree-
p
h
as
e sy
nc
hr
on
o
u
s
m
o
t
o
r
Th
e ex
citatio
n
wind
ing
o
f
th
e
syn
c
hrono
us
machine is connected in series
to
th
e in
pu
t o
f
th
e in
v
e
rter
an
d th
erefo
r
e th
e ex
citatio
n
cu
rren
t is d
i
rect
ly p
r
o
p
o
r
tio
n
a
l
to
th
e lo
ad
curren
t
lik
e a
con
v
e
n
tion
a
l dc
series
m
o
t
o
r. A sy
nc
hr
o
n
i
z
i
ng
sq
ui
re-
w
ave
si
g
n
al
of
6
0
deg
r
ee
pul
se
wi
dt
h i
s
o
b
t
a
i
n
ed
by
sensi
n
g l
i
n
e
-
t
o
-l
i
n
e
v
o
ltag
e
s with
th
e h
e
lp
of a sm
a
l
l
step
-down
tran
sfor
m
e
r fro
m
th
e sy
n
c
hro
nou
s m
a
ch
in
e term
in
al
s. Th
is
sy
nch
r
o
n
i
z
i
n
g si
gnal
i
s
i
n
p
u
t
t
e
d t
o
t
h
e m
i
crop
r
o
cess
o
r
-
bas
e
d co
nt
r
o
l
ci
rcui
t
[1
1]
for
ge
nerat
i
n
g fi
ri
ng
pul
se
s
for six
SCRs
of t
h
e inverte
r
in proper sequence. T
h
e
firing angle
of t
h
e
line comm
utated inverte
r
is a
l
ways
kept
bet
w
een
9
0
deg
r
ee
t
o
18
0 deg
r
ee.
T
h
e com
m
ut
ati
on o
f
t
h
e
SC
R
s
of
i
nve
rt
er
i
s
pe
rf
orm
e
d
by
t
h
e v
o
l
t
a
g
e
i
n
d
u
ced
i
n
t
h
e
st
at
or
wi
n
d
i
n
g
of t
h
e sy
nc
h
r
o
n
ous m
o
t
o
r
whic
h is see
n
by the inve
rter as a three-phase ac
source.
Und
e
r stan
d
s
ti
ll co
n
d
itio
n, syn
c
hrono
u
s
mo
tor termin
al
v
o
ltag
e
is zero an
d
th
erefo
r
e firin
g
p
u
l
se
g
e
n
e
ration
is no
t p
o
ssib
l
e. The syn
c
h
r
on
ou
s
m
o
to
r is u
n
a
b
l
e to
start fro
m
stan
d
s
till co
nd
i
tio
n
.
Th
erefore ex
tra
starting m
e
thods a
r
e
necessa
ry to
start the
sync
hron
ous
m
achine from
standstill co
ndition. In the
pres
e
n
t
w
o
r
k
, a
d
c
shu
n
t
m
o
to
r
is
used
to dr
iv
e t
h
e syn
c
hr
ono
us m
o
to
r
as a
g
e
n
e
r
a
tor
as sh
own
in
Figu
re 1
f
o
r
pr
o
duci
ng s
u
f
f
i
ci
ent
i
nduce
d
vol
t
a
ge i
n
t
h
e
st
at
or wi
ndi
ng
fo
r ge
nerat
i
ng
fi
ri
n
g
p
u
l
s
es.
A va
ri
abl
e
resi
st
or as
shown in Figure 1 is connected across
t
h
e i
nve
rt
er t
o
al
l
o
w cur
r
e
n
t
fl
ow
i
ng t
h
r
o
ug
h t
h
e fi
el
d wi
ndi
n
g
of t
h
e
sy
nch
r
o
n
o
u
s
m
o
t
o
r
du
ri
n
g
st
a
t
i
ng.
Fi
ri
n
g
p
u
l
s
es f
o
r
SC
R
s
o
f
t
h
e
i
n
vert
er
a
r
e
no
w
pr
o
duc
ed
fr
om
t
h
e no
l
o
a
d
i
n
d
u
ced em
f of t
h
e ge
nerat
o
r
.
W
h
e
n
t
h
e s
p
e
e
d o
f
t
h
e m
o
t
o
r bec
o
m
e
s about
50
0 r
p
m
,
po
wer s
u
p
p
l
y
t
o
t
h
e dc
m
o
to
r is switc
h
e
d
o
f
f and
the resistan
ce of
the starting re
hostat is grad
ual
l
y increased. Now the sync
hronous
m
o
tor receives
electrical power
from
the dc source and always runs
at synchronous s
p
eed
corres
ponding to
Evaluation Warning : The document was created with Spire.PDF for Python.
I
J
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S
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9
4
Experi
me
nt
al
I
n
vest
i
g
at
i
ons
o
f
t
h
e Sel
f
-
C
o
nt
rol
l
e
d
Sy
nchr
o
n
o
u
s
Mot
o
r C
o
nnect
e
d
t
o
…
(Tap
an
K
u
ma
r
C.)
3
th
e freq
u
e
n
c
y o
f
th
e m
o
to
r term
in
al v
o
ltag
e
. Und
e
r steady state co
n
d
itio
n, th
e sp
eed
o
f
th
e m
o
to
r can
b
e
v
a
ried
in th
e
follo
wing
ways:
i)
Varying
t
h
e inp
u
t
d
c
vo
ltag
e
to
th
e i
n
v
e
rter lik
e a co
nv
en
tion
a
l d
c
series mo
tor.
ii)
Changing t
h
e firing angle
of the in
ve
rter just
like
the spee
d change of
a c
o
nve
nt
i
o
nal
dc s
e
ri
es m
o
t
o
r
by
sh
ifting
th
e brush
p
o
sitio
n
.
3.
EX
PER
I
M
E
NTA
L
R
E
SU
LTS AN
D DISC
USSION
The e
x
peri
m
e
nt
al
perf
o
r
m
a
nce of
t
h
e sy
st
em
u
nde
r l
o
a
d
ha
s bee
n
obt
ai
ne
d
wi
t
h
t
h
e
hel
p
of
co
u
p
l
e
d
d
c
m
ach
in
e r
u
n
n
i
n
g
as sep
a
rately ex
cited
d
c
g
e
n
e
r
a
to
r. Th
e syn
c
hro
nous
m
o
to
r
u
s
ed
in
th
e p
r
esen
t
w
o
r
k
h
a
s
t
h
e fol
l
o
wi
n
g
r
a
t
i
ngs:
3 p
h
, 4
40
V, 1
0
.
8
A,
7.
5 K
VA,
15
0
0
rpm
,
50 H
Z
, and
exci
t
a
t
i
on:
40
V, 8 A
.
Lo
ad t
e
st
s
are carried ou
t
on
th
e system b
y
v
a
rying
the lo
ad on
t
h
e
syn
c
hrono
us
m
o
to
r with
d
c
lin
k
vo
ltag
e
,
V
d
and
firin
g
an
gle,
α
co
nstan
t
. Th
e
ex
p
e
rim
e
n
t
al c
h
aracteristics of th
e syste
m
u
n
d
e
r lo
aded
con
d
ition
are shown
i
n
Fi
gu
res
1 t
o
4.
It
can
be o
b
se
rve
d
f
r
o
m
Fi
gure
1 t
h
at
t
h
e
s
y
st
em
exhi
bi
t
s
alm
o
st
sim
i
l
a
r t
o
r
que
ve
rsus
spee
d
characte
r
istic like a conventi
onal
dc series
m
o
tor. The
c
h
aracteristic curve is shi
f
te
d
upwa
rd with i
n
c
r
ease in
fi
ri
n
g
an
gl
e. It
i
s
obvi
ous t
h
a
t
at
l
o
wer m
o
t
o
r s
p
eed
, t
o
r
q
ue i
s
very
hi
g
h
an
d bec
o
m
e
s l
o
w at
hi
ghe
r
spee
d.
The va
ri
at
i
on
of t
o
r
que
wi
t
h
dc l
i
nk c
u
r
r
en
t
for
di
ffe
re
nt
com
b
i
n
at
i
on o
f
dc l
i
n
k cu
rre
nt
an
d fi
ri
n
g
a
ngl
e i
s
sho
w
n i
n
Fi
gu
r
e
2.
Fi
gu
re
1.
Va
ri
at
i
on
of
t
o
r
q
ue
wi
t
h
m
achi
n
e s
p
eed
f
o
r
di
ffe
r
e
nt
val
u
es
of
d
c
l
i
nk
v
o
l
t
a
ge a
n
d
fi
ri
ng
an
gl
e
Fi
gu
re
2.
Va
ri
at
i
on
of
t
o
r
q
ue
wi
t
h
dc l
i
n
k c
u
rre
nt
f
o
r
di
ffe
r
e
nt
val
u
es
of
d
c
l
i
nk
v
o
l
t
a
ge a
n
d
fi
ri
ng
an
gl
e
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I
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PED
S
Vo
l. 7,
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.
1,
Mar
c
h
2
016
:
1
–
6
4
It
i
s
obser
ve
d fr
om
Fi
gure 3
t
h
at
sy
nchr
on
ous m
o
t
o
r spe
e
d cha
nges
wi
t
h
dc l
i
nk cu
rr
ent
l
i
k
e a dc seri
es
m
o
t
o
r. Fi
g
u
re
4 sh
o
w
s t
h
e
va
ri
at
i
on
of m
o
t
o
r spee
d
wi
t
h
fi
ri
n
g
an
gl
e at
const
a
nt
dc l
i
n
k
vol
t
a
ge
. T
h
e f
i
ri
n
g
angl
e m
u
st
be
wi
t
h
i
n
t
h
e safe
regi
on
t
o
a
voi
d c
o
m
m
ut
at
i
on fai
l
u
re
. S
o
l
a
r
g
e ra
n
g
e
of s
p
eed
vari
at
i
o
n i
s
n
o
t
pos
si
bl
e
by
fi
ri
ng
an
gl
e c
h
an
g
e
as m
a
y
be o
b
s
erve
d
fr
om
Fi
gu
re
4.
Fi
gu
re
3.
Va
ri
at
i
on
of
m
achi
n
e spee
d
wi
t
h
i
n
put
dc c
u
rre
nt
t
o
t
h
e
i
n
vert
e
r
Fi
gu
re 4.
Va
ri
at
i
on of
m
achi
n
e
spee
d wi
t
h
fi
ri
n
g
a
ngl
e fo
r di
ffe
re
nt
val
u
e
s
o
f
dc
l
i
n
k vol
t
a
ge
The
wave
fo
rm
s fo
r m
achine term
inal
vol
t
a
ges are
gi
ve
n
i
n
Fi
g
u
re
5 i
n
whi
c
h t
h
e c
o
m
m
u
t
a
t
i
on spi
k
es a
r
e
clearly v
i
sib
l
e at 6
0
d
e
g
r
ee
in
terv
al.
Th
e
o
s
cillo
gram
s o
f
d
c
lin
k
vo
ltag
e
an
d
i
n
v
e
rter inp
u
t
d
c
cu
rren
t at
l
o
ade
d
c
o
n
d
i
t
i
ons
o
f
t
h
e
dri
v
e are
gi
ve
n i
n
Fi
gu
re
6.
It
i
s
obs
er
ved
t
h
at
t
h
e
ri
p
p
l
e
co
nt
e
n
t
i
n
dc l
i
n
k c
u
rre
nt
i
s
sm
al
l
due t
o
hi
gh
i
n
duct
a
nce i
n
t
h
e
dc
l
i
n
k.
Evaluation Warning : The document was created with Spire.PDF for Python.
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4
Experi
me
nt
al
I
n
vest
i
g
at
i
ons
o
f
t
h
e Sel
f
-
C
o
nt
rol
l
e
d
Sy
nchr
o
n
o
u
s
Mot
o
r C
o
nnect
e
d
t
o
…
(Tap
an
K
u
ma
r
C.)
5
Fi
gu
re 5.
W
a
v
e
fo
rm
s
of
m
a
chi
n
e Term
i
n
al
vol
t
a
ge
s
V
ab
,
V
bc
and
V
ca
Fig
u
re
6
.
W
a
veform
s o
f
d
c
lin
k vo
ltag
e
and
in
pu
t d
c
current at lo
ad
ed
cond
itio
n
4.
CO
NCL
USI
O
N
The
steady stat
e pe
rform
a
nce
characte
r
istics of th
e
l
i
n
e-c
o
m
m
u
t
a
t
e
d SC
R
i
nve
rt
er
fe
d
sy
nch
r
o
n
o
u
s
m
o
to
r h
a
v
e
been
in
vestig
ated
exp
e
rim
e
n
t
ally at
lo
ad
ed
co
nd
itio
ns. Fro
m
th
e resu
lts o
f
th
e ex
p
e
rimen
t
al
st
udy
, i
t
i
s
obs
erve
d t
h
at
t
h
e
devel
ope
d sy
st
em
exhi
bi
t
s
al
m
o
st
sim
i
l
a
r charact
eri
s
t
i
c
s l
i
k
e a con
v
e
n
t
i
onal
dc
series m
o
to
r. It is ex
p
ected th
at th
e system will
fin
d
go
od
app
licatio
n
s
lik
e tractio
n,
d
r
illin
g, liftin
g and
hoisting, etc in place
of conv
e
n
tional dc serie
s
m
o
tor.
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BI
O
G
R
A
P
HY
OF
A
U
T
HO
R
Tapan Kumar Chakraborty
received his Bach
elor
of Scienc
e
in Elec
tric
al a
nd Elec
tronic
Engineering d
e
gree from Bang
ladesh Univ
ersity
of
Engin
eer
in
g and Techno
lo
g
y
, Dhaka in
1984. He completed
the M.
Eng
g
degree in Electri
cal Eng
i
neerin
g at th
e University
o
f
Roorkee,
India in
1988.
He obtained h
i
s Ph.D degree in
Electr
ical and
computer
Engineering
from
Kanazawa Univ
ersit
y
, Japan in
1998. He serv
ed
as lecture
r
,
assistant professor, associate
professor and professor in the
department of
E
l
ec
tric
al and
El
ectron
i
c Eng
i
ne
ering at Dh
aka
University
of En
gineer
ing and Technolog
y
from
1988 to 2005. In 2005, he join
ed the departmen
t
of El
ectr
i
c
a
l
and
Com
puter Eng
i
neering
as
a pro
f
es
s
o
r at
the
P
r
e
s
idenc
y
Univ
ers
i
t
y
, Dhak
a.
He
has
over fift
een
res
earch p
a
pers
t
o
his
credit
in
v
a
rious journals and conferen
ces
of nation
a
l and
intern
ation
a
l rep
u
te. His fie
l
ds of interests ar
e el
ectron
i
c m
a
ter
i
a
l
s
and devic
e
s
,
phas
e
chang
e
m
e
m
o
ry, ele
c
tr
onic cir
c
uits an
d power electr
oni
cs. He is a m
e
m
b
er of the Institution of
Engineers, B
a
ng
ladesh
and
a member of th
e I
E
EE.
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